• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In order to shorten the time for the steam temperature generated in a low temperature heating device to reach saturated steam temperature, this solar heat collection system is provided with a low temperature heating device which heats supplied water with solar heat to generate steam, a steam separation device which separates the water-steam two-phase fluid generated in the low temperature heating device into water and steam, and a high temperature heating device which heats the steam separated in the steam separation device with solar heat reflected by multiple heliostats to generate superheated steam, wherein the low temperature heating device includes: a first heat collector which has a linearly arranged first heat collecting tube and a first reflective member arranged linearly along the longitudinal direction of the first heat collecting tube for reflecting sunlight onto the first heat collecting tube, and which heats water flowing through the first heat collecting tube by collecting the light reflected from the first reflective member onto the first heat collecting tube; and a second heat collector which comprises a linearly arranged second heat collecting tube and which receives light reflected from at least some of the multiple heliostats to heat the water flowing through the second heat collecting tube.
    公开号:ES2681143A2
    申请号:ES201890026
    申请日:2016-11-04
    公开日:2018-09-11
    发明作者:Kohei Shinozaki；Takahiro Marumoto；Kazuhito Koyama
    申请人:Mitsubishi Hitachi Power Systems Ltd；
    IPC主号:
    专利说明:

    image 1
    DESCRIPTION SOLAR HEAT CAPTURE SYSTEM AND THE SAME OPERATING METHOD
    5 Technical field
    The present invention relates to solar heat collection systems that capture solar heat to generate water vapor and methods of operation thereof. 10 Prior art
    For example, a solar heat collection system used in the solar thermal power plants described in patent document 1 is known in the art. Patent document 1 15 describes a configuration of "a solar heat heater that includes a low temperature heating device that heats water supplied by a solar heat water supply pump; a vapor separation device that separates a biphasic water and steam fluid generated in the low temperature heating device in water and steam; a high temperature heating device that heats the separated steam in the
    20 steam separation device with solar heat; and a circulation pump that supplies the separated water in the steam separation device to the low temperature heating device ”(see summary).
    In the configuration of patent document 1, a low heating device is used
    A linear light focusing type temperature, such as a cylindrical-parabolic or Fresnel type, and a tower-type heat collection device is used as a high-temperature heating device. According to Patent Document 1, the light focusing and heat collection device may be small in size. Therefore, the construction cost can be reduced by reducing the height of the tower. Additionally, the precision of light focus required for
    30 heliostats are in proportion to the height (distance) of the tower and, therefore, the costs required to keep the light focus accuracy high, such as the costs of the adjustment angles during construction and operation, can be reduced .
    Prior art documents
    35
    Patent document
    image2
    Patent document 1: WO 2013/002054
    Summary of the invention
    5 Problem to solve by the invention
    However, according to known technology described in Patent Document 1, the steam cannot be heated by the high temperature heating device until it is
    10 Obtain enough saturated steam to generate superheated steam (until the steam is separated by the steam separation device). In other words, even if the heliostats are ready to concentrate sunlight, there is no steam that serves as an operating medium in the high-temperature heating device, and therefore heat collection (heat recovery) is not achieved. This will be described later using Figs. 6A to 6C.
    15 Figs. 6A to 6C illustrate, respectively, a direct solar radiation in good weather conditions (Fig. 6A), a fluid temperature at an outlet of the low temperature heating device (Fig. 6B) and a steam flow rate at an outlet of the device steam separation (Fig. 6C). As illustrated in Fig. 6A, direct solar radiation increases when the sun and water rise
    20 supplied to a thermal transfer tube of the low temperature heating device is heated. This causes an increase in fluid temperature at the outlet of the low temperature heating device, as illustrated in Fig. 6B. As illustrated in Fig. 6C, steam is not supplied from the steam separation device to the high temperature heating device until the temperature of the fluid at the outlet of the heating device at
    25 low temperature reaches saturation temperature and therefore, the two-phase water and steam fluid is formed. A large number of heliostats, excluding heliostats that are preheated to the high temperature heating device, remain on hold until the temperature of the water supplied reaches the saturated steam temperature in the low temperature heating device (during A- A 'in Fig. 6B). Therefore, heat cannot be captured in the
    30 high temperature heating device during A-A ’.
    Furthermore, according to the known technology described above, the amount of heat captured by the low temperature heating device and the amount of heat captured by the high temperature heating device do not balance depending on the season. So,
    35 there is a need for heliostats to remain on hold to balance the quantities. This will be described later using Figs. 7A, 7B, 8A and 8B.
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    Figs. 7A and 7B illustrate the principles of heat collection by the low temperature heating device and by the high temperature heating device. As illustrated in Fig. 7A, the low temperature heating device uses a method in which the reflected light of a horizontally arranged mirror is focused on a horizontal thermal transfer tube disposed above the mirror to heat an operating means in the thermal transfer tube. For example, during the culmination of the sun in summer, the mirror arranged horizontally to the sun is oriented to the sun more directly as the sun approaches the zenith. This allows an increase in the light reception area,
    10 that is, it allows the heat collection efficiency to be maximized. On the other hand, during the culmination of the sun in winter, for example, sunlight strikes obliquely on the mirror. This causes a decrease in the area of light reception and therefore a reduction in the efficiency of heat collection.
    15 Fig. 7B illustrates the principle of heat collection by the high temperature heating device. In this method, sunlight is reflected by a large number of tiltable biaxial mirrors called heliostats and is focused on a panel of a thermal transfer tube called a receiver, arranged on a top of a tower to heat an operating medium in the thermal transfer tube panel. In the case of the device
    At high temperature heating, as illustrated in Fig. 7B, some mirrors are oriented more directly to the sun as winter approaches and, therefore, the heat capture efficiencies of some heliostats increase. However, taking into account the individually variable efficiencies of heat collection of all hundreds to thousands of heliostats in total, annual fluctuations in heat collection efficiencies tend to
    25 be small.
    Figs. 8A and 8B illustrate relationships between the latitudes and the heat capture efficiencies of the low temperature heating device and the high temperature heating device. Fig. 8A illustrates that fluctuations in heat collection efficiencies, both of the low temperature heating device and the high temperature heating device, are small at a low latitude, where the orbit of the sun during the Day is near the zenith throughout the year. In other words, although the scales of the installation of the low temperature heating device and the high temperature heating device are determined with reference to a planned point, for example, the summer solstice, fluctuations in the efficiencies of the heat collection of the low temperature heating device and the high heating device
    image4
    temperatures are small in winter and, therefore, the amounts of heat collected, which correlate with the heat collection efficiencies, do not decrease significantly.
    However, the altitude of the sun decreases in winter at higher latitudes, as illustrated in
    5 Fig. 8B, and the heat collection efficiency of the low temperature heating device decreases, as illustrated in Fig. 7A. Therefore, in a case where the scales of the installation of the low temperature heating device and the high temperature heating device are determined with reference to the summer solstice, for example, the flow of saturated steam in winter decreases. Therefore it is
    It is necessary to eliminate the amount of heat captured by the high temperature heating device, which can capture as much heat as during the summer solstice, and the heliostats must be kept on hold. As a result, the operating coefficient of the installation decreases in known technology.
    15 To solve this problem, saturated steam, which is running out, can be generated in a complementary way by superimposing sunlight that a part of the heliostats that are not operating in the low temperature heat capture device can capture. However, the inventors of the present application have discovered through their research and development work to focus the sunlight that the heliostats can capture on the
    20 existing low temperature heat collection device (linear light focused on the heat collector) does not cause efficient heat collection or an increase in the amount of saturated steam.
    This is due to differences in the design of heat collection devices. That is, the
    25 Cylindrical-parabolic or Fresnel-type low temperature heat collection device (linear light focused on the heat collector) is originally designed to capture heat from the reflected light of a reflector / focusing element (such as a mirror or a lens) disposed at a relatively close distance (focal distance) of a heat collection tube and focused on the heat collection tube. On the contrary, the device
    High temperature heat collection is designed to receive the light reflected by a large number of heliostats disposed away from the thermal transfer tube panel (large focal length) using the heat collection surface of the thermal transfer tube panel that is extends longitudinally and transversely.
    35 More specifically, one of the main factors that prevents saturated steam from being generated efficiently, even by focusing sunlight on the heat collector with linear light focusing using heliostats, is the fact that it is difficult for the pattern The focus of the light of the heliostats matches the shape of the light receiving surface of the heat collector with a linear light focus.
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    The present invention has been made taking into account the circumstances described above. A first objective of the present invention is to provide a solar heat collection system that reduces the time for the temperature of the steam generated in a low temperature heating device to reach the temperature of the saturated steam. A second objective of the present invention is to provide a solar heat collection system
    10 that rectifies the imbalance in the amounts of heat captured by the low temperature heating device and by the high temperature heating device depending on the season.
    Means to solve the problem
    To achieve the objectives described above, a solar heat collection system according to the present invention includes a solar heat collection system that includes a low temperature heating device configured to heat water supplied using heat from sunlight to generate steam. ; a vapor separation device configured to separate a
    20 biphasic water and steam fluid generated in the low temperature heating device in water and steam; and a high temperature heating device configured to heat the separated steam in the steam separation device using the heat of sunlight reflected by a plurality of heliostats to generate superheated steam. The low temperature heating device includes: a first heat sensor that includes a first tube
    25 for heat collection, which is arranged linearly, and a first reflector element, which is arranged linearly in a longitudinal direction of the first heat collection tube, and is configured to reflect sunlight on the first tube of heat collection, the first heat collector being configured to focus the light reflected by the first reflector element on the first heat collection tube to heat the water flowing in the first collection tube
    30 heat, and a second heat sensor that includes a second heat collection tube, which is arranged linearly and configured to receive the light reflected by at least a part of the plurality of heliostats to heat the water flowing in The second heat collection tube.
    In addition, to achieve the objectives described above, a method of providing
    Operation of a solar heat collection system according to the present invention. The solar heat collection system includes a low temperature heating device
    image6
    configured to heat water supplied using heat from sunlight to generate steam, a steam separation device configured to separate a two-phase fluid of water and steam generated in the low temperature heating device in water and steam and a device for high temperature heating configured to heat the steam separated by the steam separation device using the heat of sunlight reflected by a plurality of heliostats to generate superheated steam, the low temperature heating device including a first heat collector arranged downstream in a water flow and a second heat sensor arranged upstream and being connected to the first heat sensor in series with each other. The method of operation includes: flowing water through the first
    10 heat sensor through the second heat sensor; reflect sunlight on the second heat collector using at least a portion of the plurality of heliostats for a predetermined period of time; and make the water avoid the second heat sensor and flow through the first heat sensor after the predetermined period of time.
    15 Effect of the invention
    According to the present invention, the time that elapses until the temperature of the steam generated in the low temperature heating device reaches the saturated steam temperature can be reduced. Furthermore, according to the present invention, the imbalance of the
    20 amounts of heat captured by the low temperature heating device and the high temperature heating device according to the season. Objectives, configurations and effects different from those described above will be deduced from reading the following descriptions of some embodiments. 25 Brief description of the drawings
    Fig. 1 is a diagram of the complete configuration of a solar heat collection system according to an embodiment of the present invention.
    30 Figs. 2A to 2C illustrate, respectively, direct solar radiation in good weather conditions, fluid temperatures at an outlet of a low temperature heating device and steam flow rates at an outlet of a vapor separation device to compare the present invention with A known technology.
    35 Fig. 3 illustrates the efficiency of heat collection from the low temperature heating device.
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    Figs. 4A to 4D illustrate modifications of the low temperature heat collection device applicable to the present invention.
    5 Figs. 5A to 5E illustrate modifications of the low temperature heat collection device applicable to the present invention.
    Figs. 6A to 6C illustrate a relationship between direct solar radiation in good weather conditions, the temperature of the fluid at the outlet of the low temperature heating device 10 and the steam flow rate at the outlet of the steam separation device according to known technology.
    Figs. 7A and 7B illustrate the principles of heat collection by the low temperature heating device and by the high temperature heating device.
    15 Figs. 8A and 8B illustrate relationships between the latitudes and the heat capture efficiencies of the low temperature heating device and the high temperature heating device.
    Fig. 9 is a diagram of the complete configuration of a solar heat collection system according to a second embodiment of the present invention. Description of preferred embodiments
    25 First realization
    The embodiments of the present invention will be described below with reference to the drawings. Fig. 1 is a diagram of the complete configuration of a solar heat collection system according to the embodiments of the present invention. This solar heat collection system 1 is used to supply superheated steam to a steam turbine of a solar thermal power plant. Although not illustrated, the solar thermal power plant includes the steam turbine that is driven by the superheated steam generated in a high temperature heating device 4 of the solar heat collection system 1, a generator that generates electricity using the driving force of the steam turbine, a condenser that condenses the superheated steam supplied to the steam turbine
    35 in water and a conduit for supplying the condensed water by the condenser to a low temperature heating device 2 of the solar heat collection system 1.
    image8
    In Fig. 1, the reference sign 2 indicates the low temperature heating device that heats the water using solar heat, the reference sign 3 indicates a vapor separation device that separates a two-phase fluid from water and steam into water and in steam, the reference sign 4 of 5 indicates the high temperature heating device that heats the steam using solar heat, the reference sign 5 indicates the heliostats, the reference sign 6 indicates the sun, the reference sign 7 indicates sunlight, the reference sign 10 indicates a water supply pump, the reference sign 11 indicates a circulation pump, the reference sign 15 indicates a temperature detector and the reference sign 20 indicates a control device
    10 (heliostat control device).
    In the following description, the pipe connecting the components is expressed as a conduit image9 - image9 . The " image9 ”Represents a reference symbol and, for example, a duct 2-3 represents a pipe connecting the low temperature heating device 2 and the
    15 steam separation device 3.
    As illustrated in Fig. 1, in the solar heat collection system 1, the water supplied by the water supply pump 10 is sent to the low temperature heating device 2 through a conduit 10-2. In low heating device 2
    At a temperature, the water is heated using the heat of sunlight 7 to generate a two-phase fluid of water and steam. The biphasic water and steam fluid generated is sent to the steam separation device 3 through the conduit 2-3.
    The two-phase water and steam fluid introduced in the steam separation device 3 is separated
    25 in water and steam in the steam separation device 3. The separated saturated steam is sent to the high temperature heating device 4 through a conduit 3-4. The saturated steam introduced in the high temperature heating device 4 is further heated in the high temperature heating device 4 using heat from sunlight 7 reflected by the heliostats 5 to generate superheated steam. Water separated in device 3 of
    The steam separation is sent to the circulation pump 11 through a conduit 3-11. The pressurized water in the circulation pump 11 is sent to an inlet of the low temperature heating device 2 through a conduit 11-2.
    Next, the high temperature heating device 4 will be described in detail. He
    35 high temperature heating device 4 is a so-called heat capture device with tower-type light approach and, more specifically, includes a tower 9 having a
    image10
    predetermined height (approximately 30 m to 100 m) and a panel 8 of thermal transfer tube mounted on top of tower 9. On the other hand, the large number of heliostats oriented in various directions are arranged on the floor surface and a Heliostat group focuses sunlight on the high temperature heating device 4 (panel 8 5 of thermal transfer tube) following the movement of the sun 6 to generate superheated steam. The angle of each of the heliostats 5 is controlled by the control device 20. In addition, as described below, the angles of a part of the heliostat group 5 (reference sign 5a) are controlled by the control device 20 so that the heliostats 5a can reflect sunlight on the heating device 2 low
    10 temperature
    Next, the low temperature heating device 2 will be described in detail. The low temperature heating device 2 is a so-called heat capture device with Fresnel-type light focus and, more specifically, includes a large number of
    15 flat or slightly curved light focusing mirrors 12, the angles of which are slightly different from each other and a group of thermal transfer tubes 13 arranged horizontally in a plane a few meters above said group of light focusing mirrors 12. The group 12 of light focusing mirrors focuses the sunlight 7 for the group of thermal transfer tubes 13 to heat the water flowing through the thermal transfer tubes 13 and to generate,
    20 therefore, a biphasic water and steam fluid.
    In some embodiments, a heat capture device with a cylindrical-parabolic light focus may be used, which includes light focusing mirrors that extend in the form of a parabolic cylinder and thermal transfer tubes arranged on the inner circumferences
    25 of the curved surfaces of the light focusing mirrors and focusing the sunlight on the thermal transfer tubes using the light focusing mirrors to heat the water flowing through the thermal transfer tubes thereby generating steam, instead of the low temperature heating device 2 which includes the heat capture device with Fresnel-type light focus.
    30 Next, the control of the heliostat group 5 by the control device 20 will be described. The control device 20 receives the data from the temperature detector 15 which detects the temperature of the steam at an outlet of the low temperature heating device 2. For example, for a period of time (default period) after system 1 of
    35 solar heat collection starts operating until the steam temperature detected in the temperature detector 15 reaches the saturated steam temperature, the control device 20
    image11
    controls the angles of the heliostats 5a arranged closer to the low temperature heating device 2 between the group of heliostats 5, such that the heliostats 5a are oriented to the heat transfer tubes 13 of the low temperature heating device 2. This causes the heliostats 5a to reflect and focus sunlight 7 on the thermal transfer tubes 13, resulting in a reduction in the time of generation of saturated steam by means of the low temperature heating device 2. When the steam temperature detected in the temperature detector 15 reaches the saturated steam temperature, the control device 20 controls the angles of the heliostats 5a directed to the low temperature heating device 2, such that the heliostats 5a are oriented to device 4
    10 high temperature heating (return to original positions).
    Note that the angles of the heliostats 5a arranged closer to the low temperature heating device 2 between the group of heliostats 5 are controlled, since the efficiency of the light focus on the heat transfer tubes 13 of the heating device 2
    The low temperature is higher than when the angles of the heliostats away from the low temperature heating device 2 are controlled.
    In this way, the saturated steam is not supplied to the high temperature heating device 4 until the saturated steam is generated in the low temperature heating device 2 and the high temperature heating device 4 is kept on hold. Therefore, it is not necessary to use the entire group of heliostats 5 to focus sunlight 7 on the thermal transfer tube panel 8 of the high temperature heating device 4. In this embodiment, a portion of the heliostats 5a, excluding the heliostats 5 required for preheating the high temperature heating device 4, is used to focus sunlight 7
    25 on the low temperature heating device 2 to reduce the steam generation time saturated by the low temperature heating device 2.
    The control device 20 receives the data from a temperature detector 16 that detects the temperature of the steam at an outlet of the high temperature heating device 4. For example, after the solar heat collection system 1 starts operating and the vapor temperature detected in the temperature detector 16 reaches a predetermined temperature (for example, 550 ° C), the predetermined temperature can be maintained without directing all heliostats 5 to the high temperature heating device 4 when the saturated steam flow rate of the low temperature heating device 2 does not reach the
    35 nominal flow, depending on the number of heliostats 5 or the solar radiation conditions.
    image12
    Accordingly, the angles of, for example, the heliostats 5a that are kept on hold and that are not oriented to the high temperature heating device 4 between the group of heliostats 5 are controlled, such that the heliostats 5a are oriented to transfer tubes 13
    5 thermal of the low temperature heating device 2. This causes the heliostats 5a to reflect and focus sunlight 7 on the heat transfer tubes 13, resulting in an increase in the flow of saturated steam generated in the low temperature heating device 2.
    10 When the vapor temperature detected in the temperature detector 16 drops below a predetermined temperature (e.g. 550 ° C), the control device 20 controls the angles of the heliostats 5a directed to the low temperature heating device 2 , such that the heliostats 5a are oriented to the high temperature heating device 4.
    15 Thus, in this embodiment, excluding heliostats 5a that maintain the steam temperature at the outlet of the high temperature heating device 4, a portion of the heliostats 5 is used to focus sunlight 7 on the heating device 2 at low temperature to increase the saturated steam flow rate of the heating device 2 to
    20 low temperature.
    The advantageous effects of the present invention will now be described by comparison with a known technology. Figs. 2A to 2C illustrate, respectively, direct solar radiation in good weather conditions, fluid temperatures at the outlet
    25 of the low temperature heating device and steam flows at an outlet of the steam separation device to compare the present invention with the known technology. Fig. 3 illustrates the heat capture efficiency of the low temperature heating device.
    As illustrated in Fig. 2B, the time required for the temperature of the fluid at the outlet of the low temperature heating device 2 to reach the saturated steam temperature is reduced from A-A 'to AB due to the uptake of heat using heliostats 5a. Although conditions vary depending on the number of heliostats 5a to use, the power generation scale, or other factors, the operating coefficient of heliostats
    35 increases between 5% and 8% by designing the system to reduce the time required for the generation of saturated steam between 20 and 30 minutes when there are 8 hours of sunlight per day.
    image13
    Fig. 3 illustrates the heat collection efficiency of the low temperature heating device 2 according to the present invention. The scales of the installation of the low temperature heating device 2 and the high temperature heating device 4 are determined according to, for example, the summer solstice and the heliostats 5a that are kept on hold are divided into a group for heating the heating device 2 at low temperature and in a group to heat the heating device 4 at high temperature according to the saturated steam flow rate increased by heating the heating device 2 at low temperature. This causes an increase in the efficiency of
    10 the heat collection of the low temperature heating device 2 between approximately 1.05 and 1.10 times in the spring equinox and between approximately 1.40 and 1.45 times in winter. In other words, according to the present invention, the use of heliostats 5a held on hold allows efficient heat collection even when the system is installed at high latitudes.
    In the following, various modifications of the low temperature heating device applicable to the present invention will be described with reference to the drawings. Figs. from 4A to 4D and Figs. 5A to 5E illustrate modifications of the low temperature heat collection device applicable to the present invention. A low heating device 2a
    The temperature illustrated in Fig. 4A has a configuration in which the light reflected by the heliostats 5a is focused on a thermal transfer tube 13 identical to the thermal transfer tube arranged horizontally. As long as the horizontally arranged thermal transfer tube can capture the light reflected by the heliostats 5a in this way, no additional thermal transfer tube will be provided. A heating device 2b to
    The low temperature illustrated in Fig. 4B includes a thermal transfer tube 13 disposed downstream of a thermal transfer tube arranged horizontally and capable of capturing the light reflected by the heliostats 5a. A low temperature heating device 2c illustrated in Fig. 4C includes a thermal transfer tube arranged upstream of a thermal transfer tube arranged horizontally and capable of capturing the light reflected by the heliostats 5a. How
    30 can be seen from Figs. 4A to 4C, the light reflected by the heliostats 5a can be focused on any point of the low temperature heating device 2, as long as the operating medium crosses the point. Additionally, as in a low temperature heating device 2d illustrated in Fig. 4D, two or more thermal transfer tubes 13 serve as objects that capture the light reflected by the heliostats 5a, in some cases.
    35
    image14
    In addition, as illustrated in Figs. 5A to 5E, the thermal transfer tube of the low temperature heating device may have a configuration similar to the configuration of, for example, the panel of the thermal transfer tube for the high temperature heating device 4. A low temperature heating device 2e 5 illustrated in Fig. 5A includes a thermal transfer tube panel 25 between two thermal transfer tubes arranged horizontally and the light reflected by the heliostats 5a is focused on the tube panel 25 Thermal transfer A low temperature heating device 2f illustrated in Fig. 5B includes a thermal transfer tube panel 25 downstream of a thermal transfer tube arranged horizontally and the light reflected 10 by the heliostats 5a is focused on the panel 25 of thermal transfer tube. A low temperature heating device 2g illustrated in Fig. 5C includes a thermal transfer tube panel 25 upstream of a thermal transfer tube arranged horizontally, unlike the case of low temperature heating device 2f.
    A 2 h low temperature heating device illustrated in Fig. 5D includes a thermal transfer tube 13 and a series 25 thermal transfer tube panel and the light reflected by the heliostats 5a is focused on the transfer tube 13 thermal and on panel 25 of thermal transfer tube. Fig. 5E illustrates a configuration in which the light reflected by heliostats 5a is focused on a thermal transfer tube panel 25
    20 connected in parallel with a thermal transfer tube arranged horizontally. Various low temperature heating devices described above may be adopted as appropriate.
    Second embodiment
    A second embodiment of the present invention will be described below. Fig. 9 is a schematic diagram of the configuration of a solar heat collection system according to the second embodiment of the present invention. The same components as those of the first embodiment will be indicated with the same reference signs and descriptions
    30 detailed thereof will be omitted. As illustrated in Fig. 9, a solar heat collection system 100 according to the second embodiment includes a saturated steam generation system in which light focusing mirrors 12 receive sunlight 7, focus focusing mirrors 12 light reflects and focuses the light on the heat collection tubes 13 and a circulation pump 11 causes the water in the heat collection tubes 13 to circulate to increase the temperature of the
    Water in a steam drum 3 (steam separation device); and a superheated steam generation system in which the saturated steam generated in the steam drum 3 is sent to a superheater 8 (thermal transfer tube panel) of a tower 9 and then the superheater 8 is irradiated with sunlight 7 received and reflected by heliostats 5 to generate superheated steam.
    image15
    5 In this embodiment, the saturated steam generation system includes a first linear light focus heat sensor 51 (first heat sensor) and a second linear light focus heat sensor 52 (second heat sensor) as a low temperature heating device.
    10 The first linear light focusing heat collector 51 includes the multiple heat collecting tubes 13 (first heat collection tube) of the double vacuum tube type arranged linearly and the multiple light focusing mirrors 12 (first reflector element) arranged linearly in the longitudinal direction of the respective heat collection tubes 13 of the double vacuum tube type (hereinafter referred to as heat collection tubes 13) and reflecting the light
    15 solar on the heat collection tubes 13, and is configured to heat the water flowing in each of the heat collection tubes 13 by focusing the light reflected by each of the light focusing mirrors 12 on each of the heat collection tubes 13. The multiple heat collection tubes 13 are arranged in a plane a few meters above the group of light focusing mirrors 12. The number of heat collection tubes 13 and the number of mirrors 12 of
    20 light focus can be determined as deemed appropriate according to the specifications.
    The second linear light focusing heat sensor 52 includes multiple heat collection tubes 30 (second heat collection tube) of the double vacuum tube type. The multiple heat collecting tubes 30 of the double vacuum tube type (hereinafter referred to as 25 heat collection tubes 30) are arranged vertically in a plane (panel form), while each of the tubes 30 heat collection is arranged horizontally. The heat collection tubes 30 are connected in series, the multiple heat collection tubes 30 arranged in a plane receive the light reflected by the heliostats 5a that are held on hold and then the water flowing through the heat collection tubes 30 heat heats up. At the moment
    The number of heat collection tubes 30 can be determined as deemed appropriate according to the specifications. The type of double vacuum tube of the heat collection tubes having an outside diameter of 70 mm tube and an outside diameter of the glass tube of 125 mm, for example, is applicable to heat collection tubes 13 and the heat collecting tubes 30.
    35
    image16
    The second linear light focusing heat sensor 52 is installed in a space between the tower 9 and the heliostats 5. In this embodiment, the second linear light focusing heat sensor 52 is mounted on a tower support structure 9 taking into account the focal distance of the heliostats 5. However, the second linear light focusing heat sensor 52 can
    5 be mounted on an additional support structure arranged in the space between tower 9 and heliostats 5.
    Additionally, in this embodiment an auxiliary mirror 55 (second reflector element) is arranged on the rear side of the heat collection tubes 30 (opposite side to which
    10 provide the heliostats 5) to increase the efficiency of light focusing by secondary reflection of the reflected light that escapes through the spaces between the heat collection tubes 30. However, it is not necessary to include the auxiliary mirror.
    The first linear light focusing heat sensor 51 and the second heat sensor 52 of
    15 linear light focus are connected in series by means of two three-way valves 31 and 32 that serve as flow channel change mechanisms. The second linear light focusing heat sensor 52 is arranged upstream in a water flow and the first linear light focusing heat sensor 51 is disposed downstream. More specifically, an inlet of the heat collection tubes 30 is connected to an outlet of a circulation pump 11
    20 via the three-way valve 31. In addition, an outlet of the heat collection tubes 30 is connected to an inlet of the heat collection tubes 13 by the three-way valve 32. In addition, the three-way valve 31 and the three-way valve 32 are connected to each other by the ends of the remaining ports using a pipe. Additionally, a water thermometer 33 is provided for the steam drum that measures the temperature of the water
    25 into the steam drum 3 in the steam drum 3 and opening and closing signals are introduced based on the reading of the water thermometer indicator 33 for the steam drum at the two three-way valves 31 and 32.
    Next, the operations of the solar heat collection system will be described according to
    30 the second embodiment configured as indicated above. When the solar heat collection system starts up after sunrise, the saturated steam generation system is first started. Until the reading of the water thermometer indicator 33 for the steam drum reaches a specific temperature (for example, 300 ° C), the three-way valve 31 opens in a direction that allows the water to serve as a fluid
    35 flowed in the direction of arrow A in Fig. 9 from the outlet of the circulation pump 11 to the inlet of the heat collection tubes 30, and the three-way valve 32 is
    5
    10
    fifteen
    twenty
    25
    30
    35


    it opens in a direction that allows the water serving as a tubed fluid to flow from the outlet of the heat collection tubes 30 to the entrance of the heat collection tubes 13. Consequently, there is no fluid flow between the three-way valves 31 and 32 (first flow channel).
    When the circulation pump 11 is operated in this state, the water sent out of the circulation pump 11 flows sequentially in the three-way valve 31, the heat collection tubes 30, the three-way valve 32, the heat collection tubes 13 and steam drum 3, and then return to the circulation pump 11. At this time, the heat collection tubes 30 are irradiated with the reflected light 34 by the heliostats 5a held on hold to increase the temperature of the water inside the heat collection tubes 30. The hot water is sent to the heat collection tubes 13 and the temperature of the hot water is further increased by the light reflected from the light focusing mirrors 12 radiated with sunlight 7.
    After the reading of the water thermometer indicator 33 for the steam drum reaches a specific temperature, the saturated steam inside the steam drum 3 is ready to be supplied to the superheater 8. In the stage in which the superheater 8 is radiating with light reflected by heliostats 5, irradiation by heliostats 5a held on hold is changed from heat collecting tubes 30 to superheater 8 to generate superheated steam. Subsequently, the three-way valves 31 and 32 are changed to separate the fluid in the heat collection tubes 13 and the fluid in the heat collection tubes 30. In other words, the hot water sent out of the circulation pump 11 flows directly into the heat collection tubes 13 in the direction of the arrow B in Fig. 9 through the pipe connecting the three-way valve 31 and the three-way valve 32 downstream, without passing through the heat collection tubes 30.
    As described above, according to the second embodiment, the amount of heat captured by the entire low temperature heating device (linear light focusing heat collector) increases at the beginning of the solar heat collection system and, therefore, the Saturated steam can be generated in steam drum 3 faster than previously possible. This results in a reduction of the start time.
    In addition, the multiple heat collection tubes 30 are arranged in an orthogonal plane between the tower 9 and the heliostats 5 and, therefore, the heat collection tubes 30 can be efficiently irradiated with the light reflected by the heliostats 5a held in wait and, in addition, all heat collection tubes 30 can be efficiently irradiated with the light reflected by
    5
    10
    fifteen
    twenty
    25
    30
    35


    5th heliostats held on hold. This facilitates the formation of a uniform heating state and a control of local temperature increases, such as hot spots.
    As described above, by virtue of the solar heat collection system 1 according to the embodiments of the present invention, the water supplied to the low temperature heating device 2 can be heated using the light reflected by the light focusing mirrors 12 of the low temperature heating device 2 and the light reflected by the heliostats 5a held on hold. This causes a reduction in the time required to generate saturated steam in the low temperature heating device 2. Therefore, the operating coefficient of the solar collection system 1 is improved. In addition, even at high latitudes, the use of heliostats 5a held on hold rectifies the imbalance of the amounts of heat captured between the low temperature heating device 2 and the high temperature heating device 4 caused by the stations and prevents, therefore, a reduction in the efficiency of light focus.
    The present invention is not limited to the embodiments described above and includes several modifications. For example, the details of the embodiments described above serve to intelligibly describe the present invention and are not intended to limit the invention to those with all the configurations described above.
    For example, three-way valves 31 and 32 are only described as an illustrative combination of the flow channel change mechanism. Alternatively, for example, several flow adjustment valves may be arranged in a flow channel that passes through the heat collection tubes 30 and in a flow channel that avoids the heat collection tubes 30.
    In this case, the flow rate of fluid (water) to be heated flowing through the heat collection tubes 30 can be adjusted while the total amount of fluid that is heated flows through the heat collection tubes 13 by controlling the opening of each of the flow adjustment valves. This allows an adjustment of the operation in which, for example, the total amount of fluid to be heated flows into the heat collection tubes 13 and the heat collection tubes 30 immediately after the heat collection system 100 solar is started and in which the flow of the heating fluid flowing through the heat collection tubes 30 gradually decreases with the passage of time after the start.
    Reference numbers
    image17
    1 Solar heat collection system 2 Low temperature heating device 3 Steam / steam drum separation device
    5 4 High temperature heating device 5 Heliostat 5a Heliostat held on hold 6 Sun 7 Sunlight
    10 8 Thermal transfer tube / superheater panel 9 Tower 10 Water supply pump 11 Circulation pump 12 Light focus mirror
    15 13 Heat transfer tube / heat collection tube 15 Temperature detector 20 Control device (heliostat control device) 30 Heat collection tube (second heat collection tube) of double vacuum tube type 31, 32 Three-way valve (flow channel change mechanism)
    20 55 Auxiliary mirror (second reflector element) A Sunrise time A´ Steam generation time (according to related technology) B Steam generation time (according to the present invention) C Water saturation temperature ( at a certain pressure)
    25 D Light reception area E Reflected light N North S South
    权利要求:
    Claims (5)
    [1]
    image 1
    1.-A solar heat collection system comprising: a low temperature heating device configured to heat water
    5 supplied using the heat of sunlight to generate steam; a steam separation device configured to separate two-phase fluid from water and steam generated in the low temperature heating device in water and steam; and a high temperature heating device configured to heat the steam
    10 separated in the vapor separation device using the heat of sunlight reflected by a plurality of heliostats to generate superheated steam, wherein the low temperature heating device includes: a first heat sensor that includes a first collection tube of heat that is arranged linearly and a first reflector element that is arranged linearly in one direction
    15 of the first heat collection tube and configured to reflect sunlight on the first heat collection tube, the first heat sensor being configured to focus the light reflected by the first reflector element on the first heat collection tube to heat the water flowing in the first heat collection tube; and a second heat sensor that includes a second heat collection tube that is
    20 has a linear shape, and is configured to receive the light reflected by at least a part of the plurality of heliostats to heat the water flowing in the second heat collection tube, the first heat sensor is arranged downstream in a water flow, the second heat sensor is arranged upstream, and the first heat sensor and the second heat sensor
    25 are connected in series with each other, and the low temperature heating device further includes a flow channel change mechanism configured to change a water flow channel between a first flow channel along which water flows inside of the first heat sensor through the second heat sensor and a second flow channel along which the
    30 water avoids the second heat sensor and flows into the first heat sensor.
    [2]
    2. The solar heat collection system according to claim 1 further comprising: a heliostat control device configured to control the angles of the plurality of heliostats, wherein
    The heliostat control device controls the angle of each of the plurality of heliostats so that sunlight reflects on the heating device at
    twenty
    image2
    high temperature and so that sunlight reflects on the second heat collector for a predetermined period of time.
    [3 ]
    3. The solar heat collection system according to claim 2, wherein the flow channel change mechanism changes the flow channel to the first flow channel during the predetermined period of time, and changes the flow channel of the first flow channel to the second flow channel after the predetermined period of time elapses.
    [4]
    4. The solar heat collection system according to claim 3, wherein the predetermined period of time is a period of time until the water supplied to the low temperature heating device reaches a saturated steam temperature.
    [5 ]
    5 .- A method of operation of a solar heat collection system, including the solar heat collection system a low temperature heating device configured to heat the water supplied using the heat of sunlight to generate steam, a device of steam separation configured to separate two-phase fluid from water and steam generated in the low temperature heating device in water and steam, and a high temperature heating device configured to heat the separated steam in the steam separation device using the heat of sunlight reflected by a plurality of heliostats to generate superheated steam, the low temperature heating device including a first heat sensor arranged downstream in a water flow and a second heat sensor arranged upstream and being connected with the first heat sensor in series with each other, comprising the method of operation Oning: to make water flow in the first heat sensor through the second heat sensor; reflect sunlight on the second heat collector using at least a portion of the plurality of heliostats for a predetermined period of time; and make the water avoid the second heat sensor and flow into the first heat sensor after the predetermined period of time.
    twenty-one
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    同族专利:
    公开号 | 公开日
    AU2016349191A1|2018-06-07|
    JP6803846B2|2020-12-23|
    WO2017078134A1|2017-05-11|
    JPWO2017078134A1|2018-08-30|
    ES2681143B2|2019-04-04|
    US10775079B2|2020-09-15|
    WO2017077766A1|2017-05-11|
    US20190056148A1|2019-02-21|
    AU2016349191B2|2019-08-01|
    ES2681143R1|2018-09-21|
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    优先权:
    申请号 | 申请日 | 专利标题
    JP2015-2168922015|2015-11-04|
    JP2015216892|2015-11-04|
    JP160760482016JP|2016-09-05|
    PCT/JP2016/076048|WO2017077766A1|2015-11-04|2016-09-05|Solar heat collection system and operation method thereof|
    PCT/JP2016/082791|WO2017078134A1|2015-11-04|2016-11-04|Solar heat collection system and operation method thereof|
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