• 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:
    [Problem] To provide an exhaust gas mixing device that can facilitate exhaust gas mixing with little increase in pressure loss. [Solution] The exhaust gas mixing device that is provided with gas mixers 1 into which combustion exhaust gas G, to which a reducing agent for reducing nitrogen oxides in the combustion exhaust gas has been added, is introduced is characterized in that: the gas mixers each have a gas flow path through which the combustion exhaust gas G flows with one of two parallel surfaces for a cuboid space 3 as a gas inflow surface and the other as a gas outflow surface; and the gas flow path has the gas inflow surface and the gas outflow surface divided into at least four symmetrical regions of identical surface area by lines (9a, 10a), (9b, 10b) passing through centers 7, 8 of the respective surfaces, and is provided with gas flow path dividing plates 6 (a - d) that guide the combustion exhaust gas G flowing into each region of the gas inflow surface to the various regions of the gas outflow surface in positions where the regions are each offset by one around a line segment L3 joining the centers of the gas inflow surface and the gas outflow surface.
    公开号:ES2653937A1
    申请号:ES201790047
    申请日:2016-04-07
    公开日:2018-02-09
    发明作者:Katsumi Yano；Goki Sasaki；Masaharu Morii
    申请人:Mitsubishi Hitachi Power Systems Ltd；
    IPC主号:
    专利说明:

    5 Field of the Invention
    The present invention relates to an apparatus for mixing exhaust gas and, in particular, it relates to an apparatus for mixing exhaust gas that includes a plurality of gas mixers provided in a cross section of the flow channel of a gas conduit exhaust in which an exhaust gas is introduced from
    10 combustion to which a reducing agent is added which reduces the nitrogen oxide in the combustion exhaust gas, and which is on the upstream side of a layer of denitration catalyst of a denitration apparatus. State of the Art In general, in an electric power production plant, or the like, it is used
    15 a denitration apparatus for treating nitrogen oxide in the combustion exhaust gas generated by a combustion installation. The combustion installation includes a boiler for coal combustion, gas combustion, oil combustion or the like. The denitration apparatus adds to the exhaust gas a reducing agent such as ammonia or an ammonia compound, on its side
    20 upstream, and reacts the reducing agent and the nitrogen oxide of the exhaust gas on a denitration catalyst, provided in the denitration apparatus, to effect a reduction treatment that produces nitrogen. Basically, the reducing agent is introduced as a gas, or is sprayed directly into the exhaust gas as a solution. Since even in the case
    After spraying a solution, it is heated and vaporized by the high temperature exhaust gas, possibly added as a gas. However, the amount of target exhaust gas from the denitration treatment reaches 3 million m3N / h, for example, in the case of a 1000 MW class power generation facility. On the contrary, that of the agent of
    30 reduction is 9000 m3N / h including dilution air and the like. In other words, since the amount of exhaust gas is approximately 300 times greater than that of the gaseous reduction agent, in order to improve the efficiency of the denitration it is necessary to disperse a very small amount of the gaseous reduction agent in a large amount of gas. escape The emission regulation of
    35 nitrogen oxide (NOx) from the system tends to be more stringent and, for


    For example, a denitration rate equal to or greater than 90% is required. At the same time, it is regulated that the concentration of free ammonia due to unreacted ammonia leaks, which is the reducing agent, from the denitration apparatus, does not exceed a few ppm. To comply with such regulation is
    It is important to check that the molar ratio of ammonia (NH3) to nitrogen oxide (NOx) upstream of the denitration catalyst does not exceed 1.
    For example, Patent Literature 1 proposes to independently control the injected amounts of ammonia in a respective plurality of regions by dividing the cross section of the flow channel of a gas conduit into regions.
    10 and providing a plurality of ammonia injection nozzles for the respective regions. Accordingly, the concentration of NOx or the concentration of free ammonia in the cross-section of the flow channel can be measured, at the outlet of a denitration catalyst, to perform a fine adjustment by performing a feedback control on the amounts of ammonia injected into each of
    15 regions. Moreover, a gas mixer is generally used as disclosed in Patent Literature 2. This is installed in an exhaust gas duct between an ammonia injection nozzle and a denitration catalyst, and an effect is expected. for mixing the exhaust gas and ammonia gas.
    20 List of Appointments Patent Literature Patent Literature 1: JP 4069196 B Patent Literature 2: JP 4539930 B Patent Literature 3: JP-UM-6-31826 A
    25 Summary of the Invention Technical Problem However, even with the procedure of Patent Literature 1, since the place where the increase and decrease in the amount of injected ammonia is reflected fluctuates due to the installation methods such as direction of laying
    30 of the exhaust gas duct, the presence or absence of a guide fin, the size of the exhaust gas duct and similar factors, it is not easy to regulate the amounts of injected ammonia. Moreover, deviations from the exhaust gas flow and NOx concentration arise at individual locations in the cross section of the exhaust gas duct. Additionally, when it is increased or
    35 decreases the injected amount of ammonia in a certain region, not necessarily


    increases or decreases the concentration of ammonia in a place located some distance from that region. Consequently, such a situation does not change even if the number of ammonia nozzles is maximized, and it is a difficult operation to regulate the amounts of ammonia (NH3) injected in response to deviations from the
    5 Exhaust gas flow and NOx concentration in the different places of the duct cross section.
    Based on the above, to meet the NOx output concentration and not emit an excess of NH3, the molar ratio of NH3 / NOx has to be uniform to a high degree over all regions of the cross section of the gas flow channel
    10, on the inlet side of the denitration catalyst. Moreover, since the gas flow and the NOx concentration also fluctuate as the power generation load changes, it is necessary to determine the regulation conditions considering each of the situations. For this purpose, it is necessary to set the rate of change of the molar ratio (CV = standard deviation / average value) of NH3 / NOx equal or lower
    15 to 7%. Additionally, this must be achieved with a limited and short duct length. Since the gas flow and NOx concentration also fluctuate as the power generation load changes, it is necessary to determine the regulation conditions considering each of the situations. Moreover, the mixer as disclosed in Patent Literature 2
    20 generally improves the rectification effect by improving the pressure loss, and facilitates making the molar ratio of NH3 / NOx uniform by an effect of making the flow rate of the exhaust gas upstream of the ammonia nozzles uniform. Additionally, when removing places with a different concentration of nitrogen oxide, the uniformization effect appears and in a relatively short distance you can
    25 ensure that the molar ratio is uniform. However, the problem remains that the pressure loss is high and the fan power increases. For a gas mixer disclosed in Patent Literature 3, gas mixing by a rotational flow is not expected. Therefore, it is desired to equalize the exhaust gas flow rate over the cross section of the duct flow channel
    30 of exhaust gas with a short length of the duct, and sufficiently decrease the rate of change of the molar ratio (CV = standard deviation / average value) of NH3 / NOx on the inlet side of the denitration catalyst. However, the problem is that there is a great loss of pressure and a greater power of the fan that induces the exhaust gas.
    The problem to be solved by the present invention is to provide an apparatus


    To mix exhaust gas that produces little increase in pressure loss, can promote the mixing of the exhaust gas, and be compact. Solution to the problem
    To solve the problem of the present invention an apparatus is provided
    5 for mixing exhaust gas, according to the present invention, which includes a plurality of gas mixers provided in a cross section of the flow channel of an exhaust gas conduit into which combustion exhaust gas is introduced, into which add a reducing agent that reduces the nitrogen oxide of the combustion exhaust gas, and which is on the upstream side of an apparatus of
    10 denitration provided with a denitration catalyst, in which the gas mixers have a gas flow channel through which the combustion exhaust gas flows, one of two parallel faces of a cuboid space being established as the input face of gas flow, the other being established as the gas flow outlet face and, in the gas flow channel, both the gas flow inlet face and the face
    15 Gas flow outlets are segmented into at least four regions, which have the same symmetrical areas, by straight lines that cross the center of each face, and the gas flow channel is provided with a channel division plate gas flow that introduces the combustion exhaust gas, which flows through each of the regions of the gas flow inlet face, in each of the regions of the face
    20 gas flow outlet in positions where regions are offset one by one around a linear segment connecting the centers of the gas flow inlet face and the gas flow outlet face.
    With such a configuration, according to the gas mixers of the present invention, the combustion exhaust gas flowing through each of the regions of the gas flow inlet face is forced out of the flow outlet face of gas changing direction between one region and another, (for example, clockwise or counterclockwise) around the linear segment that connects the centers of the gas flow inlet face and the gas flow outlet face, by the Gas flow channel division plate. As a result, the combustion exhaust gas flowing through the gas mixers of the present invention receives a rotational force on its main flow, and is discharged by the gas flow outlet face. This rotational flow promotes the mixing of the combustion exhaust gas and a reducing agent, and a small amount of the reducing agent or the like introduced into the exhaust gas duct (chimney) in the upstream part of the denitration apparatus 35 can be evenly dispersed over a short distance. Additionally, post


    Since the angle of rotation of the incoming combustion exhaust gas is 90 ° maximum, the increase in pressure loss due to the rotational flow of the combustion exhaust gas can be avoided. When the number of segmental regions of the gas flow inlet face and the gas flow outlet face 5 is set to more than four, the increase in pressure loss can be further avoided, since the rotational force is made weaker. Notably, the apparatus for mixing exhaust gas of the present invention can also be applied to a case in which a plurality of layers of catalyst are provided in the direction of the flow of the exhaust gas, and in a case where it is provided on a cross section
    10 of the flow channel between a layer of denitration catalyst and a next layer of denitration catalyst. In this case, the flow channel dividing plate is preferably formed by at least four dividing plate elements having as common side the same linear segment that connects the centers of the flow inlet face
    15 of gas and the gas flow outlet face, and the dividing plate element is preferably formed by a curved plate that closes the gas flow between the regions of the gas flow inlet face and the outlet face of gas flow in symmetrical positions. In particular, in the gas flow channel both the gas flow inlet face
    20 as the gas flow outlet face are preferably segmented into four regions by two perpendicular straight lines that are parallel to the sides of each face and pass through the center of each face. Accordingly, a rotational flow is effectively formed in the main flow of the combustion exhaust gas that penetrates the gas mixers of the present invention. Moreover, it can be avoided that
    25 increase pressure loss. In the gas flow channel, in this case, both the gas flow inlet face and the gas flow outlet face are preferably segmented into four rectangular regions by two perpendicular straight lines that are parallel to the sides of each face and pass through the center of each face, on the plate
    The gas flow channel is divided into four dividing plate elements preferably rotating them around a common side with a 90 ° pitch, the common side being the linear segment connecting the centers of the gas flow inlet face and the gas flow outlet face, and the partition plate element is preferably formed by a curved plate that closes the gas flow between the
    35 rectangular regions of the gas flow inlet face and the flow outlet face


    of gas in symmetrical positions.
    Additionally and specifically, as shown in Figure 1 (b), the dividing plate element is preferably formed by four triangular plates A to D, mentioned below, in which the three-dimensional coordinates [xyz] of
    5 the respective vertices of the rectangular region of the gas flow inlet face are respectively [000], [100], [110] and [010], clockwise from the intersection of the two perpendicular straight lines, and the three-dimensional coordinates [xyz] of the respective vertices of the rectangular region of the gas flow outlet face are respectively [001], [101], [111] and [011], in the sense
    10 schedule from the intersection of the two perpendicular straight lines. The triangular plate A is a triangular flat plate based on a linear segment L1 that connects the vertex [100] and the vertex [011] and has as a vertex a point P1 on a linear segment L2 that connects the vertex [110] and the vertex [111]. The triangular plate B is a triangular flat plate based on the common side
    15 L3 and has as its vertex a point P2 on the linear segment L1. The triangular plate C is a triangular flat plate based on a linear segment L4 that connects the vertex [000] and the vertex [100] and has the point P2 as the vertex. The triangular plate D is a triangular flat plate based on a linear segment L5 that connects the vertex [011] and the vertex [001] and has the point P2 as the vertex.
    According to the dividing plate of the gas flow channel composed of the dividing plate elements of the aforementioned triangular plates A to D, a rotational force is applied clockwise to an incoming flow of combustion exhaust gas. However, the present invention is not limited to the gas flow channel dividing plate that applies the rotational force in the direction
    It can be configured to apply a rotational force counterclockwise on the incoming flow of combustion exhaust gas. In this case, described with reference to Figure 1 (b), the gas flow channel dividing plate is formed by dividing plate elements composed of four triangular plates sequentially stripped so that the exhaust gas from
    Combustion, which flows through the upper left region of the 1/4 regions on the side of the gas flow inlet face, is forced to exit through the upper right region of the 1/4 regions on the side of the outlet face gas flow, and the combustion exhaust gas flowing through the lower left region of the 1/4 regions on the side of the gas flow inlet face is forced out of the upper left region of
    35 the 1/4 regions of the gas flow outlet side.

    Advantageous effects of the invention
    According to the present invention, an apparatus for mixing exhaust gas can be provided with little increase in pressure loss and capable of promoting the mixing of the exhaust gas. In addition, since the apparatus for mixing gas from
    The exhaust of the present invention is compact and does not need a space in the direction of movement of the exhaust gas, it can be additionally provided even in a narrow place of the exhaust gas duct.
    Brief Description of the Drawings
    [Figure 1] Figure 1 is a perspective view to explain a structure
    10 of Example 1 of a gas mixer of the present invention. [Figure 2] Figure 2 is a diagram showing a configuration of an apparatus for mixing exhaust gas in which the gas mixers of Example 1 are arranged on the entire face of the cross section of the flow channel of a exhaust duct.
    [Figure 3] Figure 3 is a perspective view to explain a structure of Example 2 of the gas mixer of the present invention. [Figure 4] Figure 4 is a perspective view to explain a structure of Example 3 of the gas mixer of the present invention. [Figure 5] Figure 5 is a scheme showing configurations of a
    20 gas mixer of Comparative Example 3 and of an apparatus for mixing exhaust gas in which the gas mixers are arranged on the entire face of the cross section of the flow channel of the exhaust gas conduit. Description of the Embodiments In the following, the present invention is described based on examples.
    Example 1 Figure 1 (a) shows a perspective view of the configuration of a gas mixer 1 of Example 1 of the present invention. The gas mixer 1 of the present Example 1 is provided in a cross-section of the flow channel of an exhaust gas duct, into which a combustion exhaust gas is introduced into the
    30 that a reducing agent that reduces the nitrogen oxide in the combustion exhaust gas is added, and that is located on the upstream side of a layer of denitration catalyst of a denitration apparatus. In general, the cross-section of the flow channel of a denitration apparatus provided with a denitration catalyst used in a large energy production facility is
    35 rectangular, and the cross section of the flow channel of a gas conduit of


    Exhaust that introduces the exhaust gas into the denitration apparatus is also usually rectangular. Therefore, the description will be made assuming that the gas mixer 1 of the present example is applied to an apparatus for mixing configured exhaust gas
    5 by segmentation of the cross section of the flow channel into a plurality of rectangular regions and by stacking and disposing in a plurality of rows and columns of gas mixers of a size corresponding to the rectangular regions.
    As shown in Figure 1 (a), the gas mixer 1 of the present Example 1 is formed to have a gas flow channel such as a cuboid space 10 through which an exhaust gas G is flowing from combustion flowing in a direction indicated by arrow 2 shown in the figure. The gas flow channel of the present example is formed by a flow channel wall 4 of rectangular cross-section, which is formed by arranging flat plates 4 (ad) on the faces of the cuboid space 3 parallel to the direction 2 of the flow of gas inlet In the figure 15, an open face, proximal with respect to the wall 4 of the flow channel of rectangular cross-section, is the inlet face of the gas flow, and an open face, distal with respect thereto, is the face outflow of gas flow. Within the wall 4 of the flow channel of rectangular cross-section there is arranged a plate 6 for dividing the gas flow channel composed of four elements 6a to 6d
    20 of division plate that are made with the same shape. All elements 6a to 6d of the partition plate are made in the same way. Both the gas flow inlet face and the gas flow outlet face of the gas flow channel of the present Example 1 are segmented into four rectangular regions, which have the same symmetrical areas, by two straight lines
    25 perpendicular (9a and 9b), (10a and 10b) that are parallel to the sides of the gas flow inlet face and the gas flow outlet face and pass through a center 7, 8 of the gas flow inlet face and gas flow outlet face. The gas flow channel dividing plate 6 is formed in such a way that the combustion exhaust gas G, which flows through each of the regions of the flow face
    30 of gas inlet, enter in each of the regions of the gas flow outlet face in positions where the regions are offset one by one, clockwise in the present example, around a segment Linear L3 that connects the centers 7 and 8 of the gas flow inlet face and the gas flow outlet face. In other words, elements 6a to 6d of the partition plate are
    35 installed by rotating them around a common side, the common side being the segment


    linear L3, with a step of 90º clockwise in the present example.
    The dividing plate elements 6a to 6d are preferably formed by curved plates that each close the gas flow between the rectangular regions of the gas flow inlet face and the flow outlet face
    5 gas in symmetrical positions. With reference to Figure 1 (b), a configuration of the partition plate element 6a is described in detail. As shown in the figure, the dividing plate element 6a is constituted by four triangular plates A a
    D. Now, the three-dimensional coordinates [xyz] of the respective vertices of the rectangular region of the gas flow inlet face are respectively [000], 10 [100], [110] and [010], clockwise from the intersection 7 of the two perpendicular straight lines 9a and 9b. In addition, the three-dimensional coordinates [xyz] of the respective vertices of the rectangular region of the gas flow outlet face at the symmetrical positions of those vertices are respectively [001], [101], [111] and [011], clockwise from intersection 8 of the two perpendicular straight lines 10a
    15 and 10b. The triangular plate A is a triangular flat plate based on a linear segment L1 that connects the vertex [100] and the vertex [011] and has as a vertex a point P1 on a linear segment L2 that connects the vertex [110] and the vertex [111]. The triangular plate B is a triangular flat plate based on the common side
    20 L3 and has as a vertex a point P2 on the linear segment L1. The triangular plate C is a triangular flat plate based on a linear segment L4 that connects the vertex [000] and the vertex [100] and has the point P2 as the vertex. The triangular plate D is a triangular flat plate based on a linear segment L5 that connects the vertex [011] and the vertex [001] and has the point P2 as the vertex. Point position
    P1 of the triangular plate A on the linear segment L2 may be displaced from the center of the linear segment L2 within 1/3 of the length of the linear segment L2. In addition, the position of the point P2 of the triangular plates B to D may be displaced from the center of the linear segment L1 within 1/3 of the length of the linear segment L1.
    30 Moreover, omitted in the figure, the partition plate elements 6b to 6d are made from the triangular plates A to D in the same way as the partition plate element 6a, and are installed by rotating them around the common side. , the common side being the linear segment L3, with a step of 90 ° clockwise in the present example. The edge parts of the partition plate elements 6a to 6d
    35 in contact with the flat plates 4 (a-d) are respectively fixed to the plates


    flat 4 (a-d) by welding or similar. As shown in Figure 1 (b), the edge portions of the partition plate elements 6a to 6d that are not in contact with the flat plates 4 (ad) are fixed by welding or similar to support elements 11 , of bar type, such as pipes installed along the two lines
    5 perpendicular lines (9a and 9b) and (10a and 10b) and the linear segment L3.
    Figure 2 shows an example of the apparatus for mixing exhaust gas constituted by the gas mixers 1 of the present Example 1 as lattice elements. As shown in the figure, this is an example in which the gas mixers 1 are arranged over the entire cross section of the
    10 exhaust gas duct 25, on the upstream side of the denitration apparatus, so that they are adjacent to each other. Although in Example 1 the wall 4 of the rectangular cross-section flow channel, composed of the arrangement of the flat plates 4 (ad), encloses a structural body of the plates 6a to 6d dividing the gas flow channel, a case in which no one was provided
    15 wall 4 of the rectangular cross-section flow channel would be as in the figure. Notably, Figure 2 is an example, and the apparatus for mixing exhaust gas of the present invention is configured by arranging a plurality of gas mixers 1 over at least a portion of the flow channel cross-section of the gas conduit 25 escape, on the upstream side of the denitration apparatus, according to
    20 a plurality of rows and a plurality of columns. Specifically, when the gas mixers 1 are arranged in two rows and in a plurality of columns, a horizontal division plate 14 and a vertical division plate 15 are provided, and an outer circumferential wall of the exhaust gas conduit 25 is used as an outer circumferential wall of all gas mixers 1.
    The cross-section of the flow channel of a denitration apparatus that includes a denitration catalyst used for a large energy production installation is rectangular, and the cross-section of an exhaust gas conduit upstream thereof also usually be rectangular Consequently, it is desirable to determine the sectional dimensions of the gas flow channel of the
    30 gas mixer 1 to match the shortest dimension of the vertical and horizontal dimensions of the cross section of the exhaust gas duct. For example, in the present Example 1, the size of the exhaust gas duct was supposedly 18.4 m x 4.6 m. As a reference to the sectional size of the gas mixer 1, 2.3 m were taken, which was 1/2 of the shortest dimension of 4.6
    35 m, taking into account the production capacity and the capacity of


    maintenance. Notably, the size of the gas mixer 1 is properly set depending on the modes of distribution of a gas flow rate and a molar ratio, and the size of a regulating region for the injection nozzles of the reducing agent. For example, since the gas mixer 1 of the present invention is of a type in which a rotational flow is generated, it desirably has a square cross section seen in the direction of the gas flow. However, it is no problem to change the vertical / horizontal aspect ratio more or less depending on the size of the exhaust gas duct. In the present Example 1, setting it as a square of 2.3 m x 2.3 m allows
    10 properly adjust the dimension of the horizontal width of the exhaust gas duct. According to the gas mixer 1 of Example 1 described above, the combustion exhaust gas G entering the four rectangular regions of the gas flow inlet face exits the gas flow outlet face having been
    15 the direction of the gas from one region to another is diverted, (for example, clockwise) around the linear segment L3 that connects the centers of the gas flow inlet face and the gas flow outlet face, by the 6a to 6d plates of gas flow channel division. As a result, the main flow of combustion exhaust gas G flowing through the gas mixer 1 of the present example receives a force
    20 rotational which converts it into a rotational flow that is discharged by the gas flow outlet face. This rotational flow promotes the mixture of combustion exhaust gas G and a reducing agent such as, for example, ammonia. As a result, a small amount of the reducing agent or the like introduced into the exhaust gas duct (chimney), upstream of the denitration apparatus, can be dispersed
    25 evenly in a short distance. Additionally, since the rotation angle of the incoming combustion exhaust gas G is 90 °, the increase in pressure loss due to the rotational flow of the combustion exhaust gas G can be avoided, since the rotational force is weaker. For example, when configuring the device to mix exhaust gas using the
    30 gas mixers 1 of the present example, the rate of change CV (standard deviation / average value) of the molar ratio of NH3 / NOx can be set at 7% or less, and the rate of change CV (standard deviation / average value) of the gas flow rate can be set at 15% or less. Additionally, it can be avoided that the pressure loss in the gas mixer 1 increases.
    35 Example 2


    Figure 3 shows a perspective view of the configuration of a gas mixer 30 of Example 2 of the present invention. In the present Example 2, the difference with the gas mixer 1 of Example 1 is that the flat plates 4a and 4c are arranged only on the two upper and lower faces that are parallel to the
    5 direction 2 of gas flow in the rectangular solid space 3, and the other dividing plates on the two faces in the vertical direction have been omitted to form the gas flow channel. In other words, a pair of faces facing each other, of the four faces parallel to the flow of gas flowing through the cuboid space, are formed by flat plates, and the two faces of the other pair are open. The others
    10 are identical to those in Example 1, and have been given the same identification to omit their description. Example 3
    Figure 4 shows a perspective view of the configuration of a gas mixer 40 of Example 3 of the present invention. Its difference in the present Example 3 with the gas mixer 1 of Example 1 or with the gas mixer 30 of Example 2 is that all flat plates 4a to 4d on all four faces that are parallel to direction 2 have been omitted of gas flow input into the cuboid space 3. In other words, the four faces parallel to the gas flow flowing through the cuboid space 3 are open. Moreover, although it is not shown in the
    Figure 20, the edge portions of the dividing plate elements 6a to 6d of the gas flow channel dividing plate 6 are fixed to bar-like support elements, such as pipes, by welding or the like to ensure their sturdiness.
    Next, Table 1 presents the results of the numerical analysis of CV change rates [%] of the NH3 / NOx molar ratio, CV change rates [25%] of gas flow, and pressure losses [ Pa] in Examples 1 to 3 of the present invention, these being compared with the results of the numerical analyzes of Comparative Examples 1 to 3. Comparative Example 1 is an example of an exhaust gas duct in which it is not none of the gas mixers of the respective Examples 1 to 3 have been installed. Comparative Example 2 is an example in which an apparatus for mixing exhaust gas has been configured by installing the gas mixers of Patent Literature 2. The Comparative Example 3 is an example in which an apparatus for mixing exhaust gas has been configured by installing the gas mixers of Patent Literature 3, shown in Figure 5 (a), in the exhaust gas conduit 25 shown in the
    35 Figure 5 (b).


    Notably, the numerical analysis presented in Table 1 was performed using a FLUENT Ver. 6 numerical analysis software, which was given initial values with which the rate of change of the gas flow rate at the inlet face was CV = 20%, for real-scale gas mixing apparatus.
    5 Moreover, structures reflecting the actual size were also used for the ammonia nozzles, and the amount of injected ammonia was varied according to the inlet gas flow rate.
    10 [Table 1]
    Example 1 Example 2Example 3Comparative Example 1Comparative Example 2Comparative Example 3
    Molar Ratio CV of NH3 / NOx 3.92.92.49.28.75.8
    CV of Gas Flow 6.98.58.04.48.96.5
    Pressure loss 596063twenty87103
    As presented in Table 1, it is discovered that, although in all Examples 1 to 3 the pressure loss is approximately 40 Pa greater than in Comparative Example 1, in which gas mixers had not been included, the CV of
    15 The molar ratio of NH3 / NOx is lower and the mixing capacity is excellent. In other words, since Comparative Example 1 did not include mixers, the CV of the NH3 / NOx molar ratio was 9.2% higher, which did not meet the 7% normally required, although there was no problem for CV of gas flow.
    20 Moreover, it is discovered that both the mixing capacity and the reduction performance are excellent in all Examples 1 to 3, since the pressure loss is lower than in Comparative Example 2 and both the CV of the ratio molar of


    NH3 / NOx as the CV of the gas flow are lower. In other words, Comparative Example 2 can hardly be considered to change the CV of the NH3 / NOx molar ratio compared to Comparative Example 1, and the effect is less than those of the present Examples 1 to 3.
    5 Examples 1 to 3 are excellent in terms of mixing capacity, since both the pressure loss and the CV of the molar ratio of NH3 / NOx are lower than those of Comparative Example 3. Now, the gas mixer of Comparative Example 3 has a structure in which sets of two triangular plates 17 and 18 are alternately opposite each other with respect to their vertex part,
    10 having the structure in which a gas, after having passed through the inlet and being dispersed by the two triangular plates 17 of the upstream side in two directions, is mixed to exit through the outlet face, since the following two triangular plates 18 are in alternate positions. In other words, it mainly has an effect of collecting a gas flow, and is not a structure for
    15 give the gas flow a large rotational flow. Based on this, it has been found that the gas mixers of Examples 1 to 3 of the present invention are of greater effect than those of Comparative Examples 1 to 3. As above, although the present invention has been described based on examples, it is apparent to the person skilled in the art that the present invention does not
    20 is limited thereto, but may be implemented in modified or changed modes within the scope and spirit of the present invention, and that such modified or changed modes are within the technical scope of the present invention.
    For example, although in Examples 1 to 3, above, the dividing plate elements 6a to 6d of the flow channel division plate 6 are formed by combining the triangular plates A to D with each other, are not limited to this. In short, they can be formed using flat plates that transform into smoothly curved surfaces in order to introduce combustion exhaust gas G, which flows through each of the regions of the gas flow inlet face, into each of the regions of the gas flow outlet face, in positions where the
    30 regions are offset one by one around the linear segment L3 that connects the centers of the gas flow inlet face and the gas flow outlet face. Moreover, the gas flow channel division plates 6 of Examples 1 to 3 above are formed so as to introduce the combustion exhaust gas G, which flows through each of the regions of the inlet face of flow
    35 of gas, in each of the regions of the gas flow outlet face in some


    positions in which the regions are offset one by one, clockwise, around the linear segment that connects the centers of the gas flow inlet face and the gas flow outlet face. However, in the present invention, although they are formed so as to introduce combustion exhaust gas G, which flows through
    5 each of the regions of the gas flow inlet face, in each of the regions of the gas flow outlet face in positions where the regions are offset one by one, clockwise, around of the linear segment that connects the centers of the gas flow inlet face and the gas flow outlet face, the same technical effect is achieved.
    Additionally, the gas flow channel of the present invention can be composed to form it by joining together the sides of a plurality of isosceles triangle plate materials, and placing the joining parts of the plate materials, the joining parts being concave or convex, so that they are adjacent to each other or so that they are arranged so that their recess parts and their parts of
    15 projections are sequentially alternated with respect to the direction of gas flow. List of Reference Signs 1 Gas mixer 3 Cuboid space
    20 4 Rectangular flow channel wall 6 Gas flow channel dividing plate 6a to 6d Division plate elements 7 Center of a gas flow inlet face 8 Center of a gas flow outlet face
    25 9a and 9b Two perpendicular straight lines 10a and 10b Two perpendicular straight lines A to D Triangular plates L1 to L5 Linear segments P1, P2 Point

    权利要求:
    Claims (5)
    [1]
    1. An apparatus for mixing exhaust gas comprising a plurality of gas mixers provided in a cross section of the
    5 flow channel of an exhaust gas duct into which combustion exhaust gas is introduced to which a reducing agent is added which reduces the nitrogen oxide of the combustion exhaust gas and is located on the flow side above a layer of denitration catalyst of a denitration apparatus, in which
    The gas mixers have a gas flow channel through which the combustion exhaust gas flows, one of two parallel faces of a cuboid space being established as a gas flow inlet face, the other being established as a gas flow outlet face and in the gas flow channel, both the gas flow inlet face and the
    The gas flow outlet face is segmented into at least four regions, which have the same symmetrical areas, by straight lines that cross the center of each face, and the gas flow channel includes a dividing plate of the gas channel. gas flow that introduces the combustion exhaust gas, which flows through each of the regions of the gas flow inlet face, in each of the regions of the face
    20 gas flow outlet in positions where regions are offset one by one around a linear segment connecting the centers of the gas flow inlet face and the gas flow outlet face. 2. The apparatus for mixing exhaust gas according to Claim 1, wherein the flow channel dividing plate is formed by at least four
    25 dividing plate elements having as common side the linear segment connecting the centers of the gas flow inlet face and the gas flow outlet face, and the dividing plate element is formed by a plate curved that closes the gas flow between the regions of the gas flow inlet face and the face of
    30 gas flow outlet in symmetrical positions. 3. The apparatus for mixing exhaust gas according to claim 1, wherein in the gas flow channel, both the gas flow inlet face and the gas flow outlet face are segmented into four rectangular regions by two perpendicular straight lines that are parallel to the sides of each face and pass
    35 through the center of each face,

    in the gas flow channel dividing plate four dividing plate elements are arranged rotating them around a common side with a 90 ° pitch, the common side being established in the linear segment connecting the centers of the flow inlet face gas and gas flow outlet face, and
    5 The dividing plate element is formed by a curved plate that closes the gas flow between the rectangular regions of the gas flow inlet face and the gas flow outlet face in symmetrical positions.
    [4]
    4. The apparatus for mixing exhaust gas according to claim 3, wherein the partition plate element is formed by
    10 a triangular plate A based on a linear segment L1 that connects a vertex [100] and a vertex [011] and has as a vertex a point P1 on a linear segment L2 that connects a vertex [110] and a vertex [111 ],
    a triangular plate B based on a linear segment L3 that connects the vertex [000] and the vertex [001] and has as its vertex a point P2 on the linear segment 15 L1, a triangular plate C based on a linear segment L4 that connects a vertex [000] and a vertex [100] and has as a vertex the point P2, and a triangular plate D which is based on a linear segment L5 that connects the vertex [011] and a vertex [001] and has as the point P2, where
    20 the three-dimensional coordinates [xyz] of the respective vertices of the rectangular region of the gas flow inlet face are set respectively as [000], [100], [110], and [010], clockwise from the intersection of the two perpendicular straight lines, and the three-dimensional coordinates [xyz] of the respective vertices of the region
    The rectangular gas flow outlet faces are respectively set as [001], [101], [111], and [011], clockwise from the intersection of the two perpendicular straight lines.
    [5]
    5. The apparatus for mixing exhaust gas according to any one of Claims 1 to 4, wherein, in the gas mixers, the faces parallel to a gas flow flowing into the cuboid space are formed by plates
    flat that create a tubular shape.
    [6]
    6. The apparatus for mixing exhaust gas according to any one of Claims 1 to 4, wherein, in the gas mixers, a pair of faces facing each other, between the four faces parallel to a gas flow that flows to
    35 inside the cuboid space, are formed by flat plates, and the other pair of faces

    They are open.
    [7]
    7. The apparatus for mixing exhaust gas according to any one of Claims 1 to 4, wherein, in the gas mixers, the four faces parallel to a flow of gas flowing into the cuboid space are open.
    The apparatus for mixing exhaust gas according to Claim 1, wherein the edge portions of the partition plate element in contact with the flat plates of the outer faces of the cuboid space are fixed to the flat plates, and the edge portions of the partition plate element that are not in contact with the flat plate of the outer faces of the cuboid space are fixed to elements
    10 support bar type. 9. The apparatus for mixing exhaust gas according to Claim 1, wherein the gas mixers are arranged in at least part of the cross section of the flow channel of the exhaust gas conduit, on the upstream side of the denitration apparatus, forming a plurality of rows and a plurality of
    15 columns 10. An apparatus for mixing exhaust gas comprising a plurality of gas mixers provided in a cross-section of the flow channel of an exhaust gas duct into which a combustion exhaust gas is introduced to which a reducing agent that reduces the oxide of
    20 nitrogen in the combustion exhaust gas and which is located on the upstream side of a layer of denitration catalyst of a denitration apparatus, in which
    the gas mixers have a flow channel through which the combustion exhaust gas flows, one of the two parallel faces of a cuboid space 25 being a gas flow inlet face, the other being a flow outlet face of gas, and the gas flow channel is formed by joining together the sides of a plurality of isosceles triangle plate materials, and placing the joining parts of the plate materials, the concave or convex joining parts being, for that are adjacent to each other or so that they are arranged so that their recess parts
    30 and its projection parts are sequentially alternated with respect to the direction of the gas flow.


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    同族专利:
    公开号 | 公开日
    CN107614091A|2018-01-19|
    ES2653937B2|2018-10-25|
    KR102017485B1|2019-09-03|
    US10343116B2|2019-07-09|
    JP2016215139A|2016-12-22|
    TWI634940B|2018-09-11|
    WO2016186193A1|2016-11-24|
    TW201703845A|2017-02-01|
    CN107614091B|2020-11-20|
    KR20170138517A|2017-12-15|
    JP6591197B2|2019-10-16|
    US20180147529A1|2018-05-31|
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    法律状态:
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    优先权:
    申请号 | 申请日 | 专利标题
    JP2015103605A|JP6591197B2|2015-05-21|2015-05-21|Exhaust gas mixing device|
    JP2015-103605|2015-05-21|
    PCT/JP2016/064985|WO2016186193A1|2015-05-21|2016-05-20|Exhaust gas mixing device|
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