• 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:
    An arrangement for utilizing geothermal heat, which arrangement comprises a closed heat collection circuit (10) placed in a well (11), and the arrangement comprises a second well (12), and a heat transfer circuit (12) is arranged between the wells (11, 12). 16), and where the well (11) has been arranged as an exchange well (19) and the second well (12) as a collection well (20), characterized in that the collection well (20) is deeper than the exchange well (19). In addition, protection requirements 2-11.
    公开号:FI13055Y1
    申请号:FIU20214104U
    申请日:2021-10-04
    公开日:2021-11-10
    发明作者:Veli-Pekka Vähäkangas
    申请人:Kaivonporaus Olympia Oy；
    IPC主号:
    专利说明:

    The invention relates to an arrangement for the utilization of geothermal, which arrangement comprises a closed heat collection circuit located in a well, the arrangement comprises a second well, and a heat transfer circuit is arranged between the wells, and the well is arranged as a manhole and a second well. Efforts have been made to increase the depth of thermal wells in order to make more efficient use of geothermal energy. Technically, it is also possible to drill a deep hole, even if the cost per meter increases the deeper it is drilled. In addition, the deeper the heat recovery circuit becomes, the more challenging the transfer of geothermal energy becomes. The suction pump has a limited head. Correspondingly, the operating temperature of the submersible pump is quickly reached. The plastic pipes in the lammon collection circuit can withstand higher temperatures than the submersible pump, but as the pressure increases, the plastic pipes flatten, which prevents or at least slows down the flow.
    The object of the invention is to provide a new type of arrangement for the utilization of a geolamp, with which geothermal energy can be utilized in a simpler and more environmentally friendly manner, but at a lower cost. The characteristic features of the arrangement according to the invention appear from the appended protection requirements. The arrangement is even more efficient and versatile, but more secure than before. z The system makes extensive use of geothermal energy, which keeps the 3 heat recovery circuit simple. At the same time, the heat recovery capacity can be easily adjusted and even increased as required. In addition, the heat well can be loaded more efficiently than before, but more simply. The arrangement can also be implemented safely in the groundwater area.
    The invention will now be described in detail with reference to the accompanying drawings, which illustrate some embodiments of the invention. Fig. 1a shows an arrangement according to the invention in connection with a heat well, Fig. 1b shows in principle a modification of the arrangement according to the invention, Fig. 1c shows in principle another modification of the arrangement according to the invention, Fig. 2 shows one embodiment of the arrangement according to the invention, Fig. 4 shows a third embodiment of the arrangement according to the invention, Fig. 5a shows a fourth embodiment of the arrangement according to the invention, Fig. 5b shows a modification of the arrangement of Fig. 5a.
    Figure 1a shows an arrangement according to the invention. The arrangement utilizes geothermal energy to heat buildings and domestic water, for example. the arrangement uses a closed-heat recovery circuit 10 which extends into the well 11. The well 11 O 25 has a collector 13 consisting of two parallel pipes connected at their lower ends to form a U-x pipe collector. In this case, a closed heat recovery circuit is formed, in which fluid is circulated to transfer heat from the well to the ground. On the ground surface there is a heat exchanger 14 or a heat pump 30 with which the heat is transferred to the heating network of the buildings 15 in the application shown in Fig. 1a. In embodiments of the invention, a heat transfer circuit 16 is connected to the well 11, which is extended to another well 12. In other words, heat is transferred between the wells. In addition, the heat transfer circuit can accurately,
    but economically regulates heat transfer between wells. Heat can also be taken from the heat transfer circuit before the heat recovery circuit, for example to low heat sites where heat can be utilized without a heat pump. This is illustrated by the upper heat exchanger 18 in Figure 1a. In this application of the system, two different heat transfer media can be recycled at the same time. That is, the heat recovery circuit may have a different fluid than the heat transfer circuit. The heat recovery circuit 10 also has a heat exchanger 17.
    Preferably, the well 11 is arranged as an exchange well 19 and the second well 12 as a collection well 20. In this case, the exchange well can be dimensioned according to the heat collection circuit without an unnecessarily deep well. In addition, it must be possible to place the pipes of both the heat recovery circuit and the heat transfer circuit in the exchanger well. On the other hand, the collection well can be optimally dimensioned in terms of heat supply. In this case, first, the diameter of the well 11 is larger than the diameter of the second well 12. Thus, the necessary means fit in the well, i.e. the changer well. On the other hand, the second well may be smaller in diameter than the well, while the second well has only the tubes of the heat transfer circuit. Especially in the applications of Figures 3 and 5a, even a small hole can be used, when the heat transfer circuit 16 mainly comprises only a suction pipe 22 which - extends to the bottom of the collecting well 20. For example, the diameter of the exchange well O 25 may be 220 mm, while the diameter of the collection well O is, for example, 115 mm. On the other hand, both wells can be drilled x the same size, which is currently about 160 mm. Of course, the diameter of each z well can change as the drilling technique goes deeper and deeper. For example, the rest of the hole can be drilled = 30 with a smaller drill bit than the initial part.
    In the embodiment of Figure 2, the heat transfer circuit 16 is open, more specifically open on the side of the exchanger well 19. The collection well 20 has a closed circulation, while the exchange well 19 has an open circulation
    to.
    The heat transfer medium from the U-tube collector 21 of the collection well 20 mixes with the heat transfer medium of the exchange well 19.
    The heat is transferred along a U-tube collector 13 mounted in the exchanger well 19 to, for example, a heat pump.
    In this application of the system, two different heat transfer media can be recycled at the same time.
    When a heating fluid with the same specific gravity as water is used in the collector of a collecting well, it is possible to use a U-tube collector even in a deep well.
    When, for example, an ethanol-based heat transfer agent having a specific gravity of water is used in the exchanger well, the heat transfer agent can be recycled at a negative temperature without cooling the heat pump exchanger.
    This results in a larger temperature difference, allowing the system to produce significantly more energy.
    At the same time, the pipes are not piled up.
    For example, the fluid recycled in the heat transfer circuit 16 is a mixture of 1 to 30% ethanol and the remainder water.
    Figure 3 shows another embodiment in which the heat transfer circuit 16 is open, but this time also open on the side of the collecting well 20.
    In this application, a warm heat transfer medium, such as water, is sucked through the suction pipe 22 from the bottom of the collection well 20.
    The hot water is transferred to the exchanger well 19. Thus, from the deep collection well, heat transfer medium is sucked from below into the exchanger well.
    From above, the heat transfer medium is returned from the exchange pit to the collection well.
    The rotation can be driven in both O directions.
    Along the return pipe 22 ”, the water is returned to the collection well.
    Preferably, the suction pipe 22 has an insulator 23 so that the heat of the warm water does not escape to the cooler return water above.
    Here again, the rotation can be driven in both directions. = 30 N Alternatively, the heat transfer circuit may be closed as shown in Figure 4 S.
    This application corresponds to the arrangement in Figure 1a.
    Thermal energy is supplied to the exchanger well 19 via the U-tube collector 21 of the collection well 20. The U-tube collector 13 circulating with the different heat transfer medium of the exchange well is supplied with energy to, for example, a heat pump.
    This application allows the use of a heat transfer medium of the same specific gravity in a deep well.
    Heat energy is transferred from the exchanger well along the second closed heat recovery circuit to the heat pump, as in other illustrated applications.
    Inside both tube circuits is a fluid, such as a heat transfer fluid.
    Figure 5a shows a partially closed heat transfer circuit 16. This collection well 20 has an ejector model heat recovery piping, where one pipe 24 is thinner than the other pipe 25. The ejector model heat recovery piping is double-acting.
    The heat transfer medium is sucked from the stronger pipe 25 and part of the heat transfer medium is returned through the thinner pipe 24 and the flow valve 26 back to the collection well 20. In this case, the vacuum sucks
    The warmer heat transfer medium absorbed through the generated vacuum at the bottom of the collection well mixes with the heat transfer medium from the thin pipe in the stronger pipe and enhances the heat transfer from the collection well to the exchange well. Figure 5b shows a modification of the heat transfer circuit of Figure 5a.
    O 25 Here, an ejector 27 is arranged in the second well 12, which O is arranged as part of the heat transfer circuit 16. Thus, in addition to the suction, pressurized = fluid is fed into the ejector x from the thinner tube 24, whereby the ejector 27 sucks fluid from the well.
    In this case 3 more flow is obtained with less power.
    Using groundwater insulation, a suitable fluid N can be used in the wells, whether the heat transfer circuit is open or closed.
    If necessary, for example, thermal insulation can also be applied to the exchange well, thus avoiding the escape of heat transferred to the exchange well into the soil.
    In embodiments of the invention, the collection well 20 is preferably arranged deeper than the exchange well 19. Sufficient volume is arranged in the exchange well for different circuits. The actual heat is then achieved in the collection well, which is transferred from the collection well to the exchange well. Generally, the second well 12 is 1.1 to 25 times deeper than the well 11. For example, the exchange well may be 400 meters deep with a collection well of 10,000 meters. The depths of both wells can be 100 to 10,000 meters. Preferably, the depth of the collection well is 800-1200 meters. The depths of the wells vary according to the need for the desired power. Depths are also affected by soil and bedrock properties.
    In applications, wells 11 and 12 are fluid-tight at their tops. In this case, the flow in the heat transfer circuit can be treated by one pump 28. If the upper ends of the wells are open, a second pump 29 is also required (Fig. 3). The upper end of the exchange well can be raised above ground level, for example in a boiler room.
    At its simplest, the arrangement works with two wells. Preferably, two or more collecting wells 20 are connected to one transducer well 19. This is shown in Figure 1b, where two collecting wells 20 are connected to one transducer well 19. O The dashed line shows two other collecting wells which can later be drilled into the arrangement if the heat demand z grow. The distances between the different wells may vary. 3 The depths of the collection wells may also vary. In addition, the arrangement may also have several exchange wells 19 N (Fig. 1c). In this case, the geothermal energy S can be optimally utilized by adjusting the transmission circuits. The depths of the wells are determined on a site-by-site basis according to the power demand. The exchange wells can also be connected to each other, as shown by the dotted lines in Figure 1c.
    By regulating the number and dimensioning of the exchange and collection wells, the utilization of the energy obtained from the system can be made more efficient and the efficiency of the system can be increased.
    In addition, one exchange well can be used to charge another exchange well indirectly via a collection well.
    In this case, a deep collection well can be loaded with a deep collection well during low consumption and / or low energy.
    Then, as consumption increases, heat can be advantageously taken from a charged shallow collection well.
    Preferably, the well 11 and / or the second well 12 are insulated with groundwater.
    This avoids disruption of groundwater flows and, on the other hand, pollution in the event of damage.
    In one application of groundwater insulation, wells 11 and 12 are filled with insulating compound, after which wells 11 and 12 are drilled open.
    The insulating compound can be, for example, concrete or bentonite clay or other known suitable casting or sealing material to make the wells completely sealed.
    The casting work is carried out outside the earth protection pipe drilled through the ground cover.
    Casting, such as concrete casting, prevents the wells from affecting the groundwater flow directions, contaminating the groundwater and allowing surface water to enter the wells.
    This results in an environmentally friendly well for groundwater areas.
    Alternatively, the groundwater insulation can be implemented by fitting a plastic or metal pipe to the well, whereby the well liquids are isolated from the groundwater.
    Elsewhere, the system can be implemented = without groundwater insulation.
    In Figures 2 to 5b, a thick contour line represents groundwater insulation, which according to the invention can be a mass or a separate component, such as a pipe.
    After the installation of the heat transfer circuit, the collection well can be filled with concrete, for example.
    In this case, the next well can be safely drilled very close. 5 The arrangement can utilize an existing heat well or heat well fields.
    For example, the current heat well
    can be adapted as an exchanger well according to the invention by installing a heat transfer circuit in the heat well. In other words, a second collector is installed in the heat well, for example. A new collection well is drilled in parallel, into which a new heat transfer circuit is extended according to the invention. Alternatively, the current heat well is adapted as a collection well and a new exchanger well is drilled in parallel. The heat transfer circuit can now continuously transfer heat between wells, allowing the system to be adjusted and used in a more versatile and efficient way. It is known that heat is taken from the heat well only as needed and sometimes the circulation is stopped. Now, in the invention, the exchange well can be loaded from a collection well, from which more heat is then obtained more efficiently than before. In a collection field with several heat wells, some of the existing heat wells can be adapted into exchange wells and the rest into collection wells. In this case, a continuous circulation can be used in the heat transfer circuits or at least in some of them, which enhances the heat transfer and collection. OF O OF O
    I Jami a +
    O + OF O OF D
    权利要求:
    Claims (11)
    [1]
    An arrangement for utilizing geothermal heat, which arrangement comprises a closed heat collection circuit (10) placed in a well (11), and the arrangement comprises a second well (12), and the one between the wells (11, 12) has a a heat transfer circuit (16) is arranged, and where the well (11) has been arranged as an exchange well (19) and the second well (12) as a collection well (20), characterized in that the collection well (20) is deeper than the exchange well (19) .
    [2]
    Arrangement according to claim 1, characterized in that the fluid circulated in the heat transfer circuit (16) is a mixture containing 1 - 30% ethanol and the remainder water.
    [3]
    Arrangement according to protection requirement 1 or 2, characterized in that the diameter of the exchange well (19) is larger than the diameter of the collecting well (20).
    [4]
    Arrangement according to one of Claims 1 to 3, characterized in that the collection well (20) is 1.1 - 25 times deeper than the exchange well (19). -
    [5]
    Arrangement according to one of Claims 1 to 4, characterized in that an ejector (27) is arranged in the second well (12), which is arranged as part of the heat transfer circuit (16). Tr a +
    [6]
    Arrangement according to one of Claims 1 to 5, characterized in that N has two or more collecting wells (20) connected to an exchange well (19).
    N> ”
    [7]
    Arrangement according to one of Claims 1 to 6, characterized in that the system comprises two or more exchange wells (19).
    [8]
    Arrangement according to one of Claims 1 to 7, characterized in that groundwater insulation is present in the exchange well (19) and / or the collection well (20).
    [9]
    Arrangement according to protection requirement 8, characterized in that during groundwater insulation the wells (19, 20) have been filled with insulating compound, after which the wells (19, 20) have been drilled.
    [10]
    Arrangement according to one of Claims 1 to 9, characterized in that the heat transfer circuit (16) is arranged to be closed or partially or completely open.
    [11]
    Arrangement according to one of Claims 1 to 10, characterized in that the wells (11, 12) are liquid-tight in their upper part.
    N
    O
    N
    O
    I a a +
    O +
    N
    O
    N
    D
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