TWI755567B - Denitrification device - Google Patents

Abstract

An object of the present invention is to provide a denitration device capable of reducing pressure loss and equalizing the flow velocity distribution of the gas flowing out from the outlet side of the duct. A means for solving the problem is a denitration device (21) including a duct through which gas flows and a denitration reactor (23) arranged in the duct, characterized in that the denitration reactor is (23) is provided with a plurality of modules (4), the modules have catalysts that react with the gas flowing into the conduit to remove nitrogen oxides in the gas, and the plurality of modules (4) are arranged such that In a pleated shape, a plurality of rectifier plates (27) are arranged on the surface of the outlet side of the plurality of modules (4) so as to be parallel to the flow direction of the gas. Module (4) contacts.

Description

Denitrification device

The present invention relates to a denitration device suitable for use in, for example, an exhaust gas treatment device.

For example, in power generation equipment such as GTCC (Gas Turbined Combined Cycle) complex power generation equipment, a denitration device is used as a device for removing nitrogen oxides (NOx) from exhaust gas. In recent years, in order to improve plant efficiency, strengthen competitiveness, etc., in denitrification equipment, it is required to have low pressure loss reduction of catalyst modules (catalyst modules) used for denitration.

Conventionally, a honeycomb structure has been used as a catalyst module. However, when a honeycomb structure is formed, a large number of cells is required. Therefore, in order to reduce the low pressure loss of the module, as in Patent Documents 1 and 2, a denitration reactor in which the module is arranged in a pleated shape is disclosed. When the module is arranged in a pleated shape, the length needs to be shortened, but the flow velocity through the body of the module can be reduced, so that the pressure loss can be reduced. [Prior Technology Literature] [Patent Literature]

[Patent Document 1] International Publication No. 2016/019050 [Patent Document 2] Japanese Patent Laid-Open No. 2006-122873

[The problem to be solved by the invention]

3 is a perspective view showing the denitration reactors described in Patent Documents 1 and 2 in which the modules are arranged in a pleated shape, and the flow of the gas passing through the denitration reactor will be described in detail. In the denitration reactor 103 shown in FIG. 3 , a plurality of modules 104 are arranged in a pleated shape (corrugated shape) in the frame body 110 . In this denitration reactor 103 , the gas flows into the denitration reactor 103 as indicated by the arrows in FIG. 3 .

Next, FIG. 4 is a schematic diagram showing the flow direction of the gas through the module shown by the oblique lines in FIG. 3 . The arrows with solid lines in FIG. 4 show the flow direction of the gas, and the arrows with wavy lines in FIG. 4 show the flow direction of the gas through the module 104 . As shown in FIG. 4 , the module 104 is inclined at an angle δ (0°<δ<90°) from an axis perpendicular to the direction of gas flow. Therefore, the gas that has flowed into the denitration reactor 103 passes through the module 104 inclined at an angle δ as indicated by the arrows of the wavy lines in FIG. 4 .

Here, FIG. 5 is a graph showing the results of investigating the flow velocity distribution of the gas flowing in the denitration reactor of FIG. 3 . As shown in FIG. 5, regarding the module arranged in a pleated shape, when viewed from the direction of the arrow P, the gas passing through the module becomes sparser on the front side (the side of the pleated mountain), The flow rate becomes relatively low. In addition, when viewed from the direction of the arrow P, on the deep side (the valley side of the pleats), the gas passing through the module becomes denser, and the flow velocity becomes relatively high. Therefore, it can be seen that in the gas passing through the denitration reactor, the flow rate of the pleated type varies according to the arrangement of the modules arranged in the pleated shape.

FIG. 6 is a graph showing the relationship of the gas flow velocity distribution obtained in FIG. 5 to the dimensionless position. In FIG. 6, the vertical axis shows the vertical velocity (m/s) of the gas, and the horizontal axis shows the dimensionless position. It can also be known from FIG. 6 that if the gas passes through the denitration reactor 103 as shown in FIG. 3 , the flow rate of the gas passing through is uneven in pleated type. Such unevenness of the gas flow velocity may cause adverse effects on downstream equipment (for example, the heat transfer performance of the heat transfer tube varies depending on the location, etc.).

FIG. 12 is a graph showing the flow velocity of the gas in the vicinity of the module shown by the oblique lines in FIG. 3 as contour lines. The arrows in FIG. 12 indicate the direction in which the gas flows (the same applies to FIG. 14 described later). As shown by the area A indicated by the arrow in FIG. 12 , it can be seen that when viewed from the outlet side of the conduit, the flow of the gas is concentrated on the valley side of the pleats of the plurality of modules 104, so the flow rate of the gas will change. Big.

FIG. 13 is a graph showing the relationship between the flow velocity distribution of the gas in the module 104 from point a to point b in FIG. 12 and the width direction of the dimensionless catalyst. In Fig. 13, the vertical axis shows the flow velocity (m/s) of the gas in the module (catalyst) 104, and the horizontal axis shows the width direction of the dimensionless catalyst. It is set to 0, and the vertex part (point b in FIG. 12 ) is set to 1. As shown in FIG. 13 , since the flow velocity of the gas is small in the vicinity of the opening of the module 104, it can be determined that the denitration of the gas is sufficiently performed here.

In addition, it can be seen that the flow velocity of the gas gradually increases from the opening of the module 104 toward the apex, and the flow velocity of the gas becomes the largest near the apex of the module 104 . Specifically, the difference between the flow velocity of the gas near the opening of the module 104 and the flow velocity of the gas near the vertex is about 2.75 m/s. In the vicinity of the apex of the module 104, since the amount of gas passing through the module 104 also increases, denitration of the gas is not sufficiently performed here, and it can be determined that the denitration efficiency is low.

FIG. 14 is a graph showing the static pressure in the vicinity of the module shown by the oblique lines in FIG. 3 as contour lines. As shown in area B in FIG. 14 , it can be seen that in the vicinity of the surface of the outlet side of the conduit of the module 104 , a pressure gradient is generated from the inlet side of the conduit to the outlet side.

As described above, in the case of using the denitration reactors in which the modules are arranged in a pleated shape, such as the aforementioned Patent Documents 1 and 2, the pressure loss can be reduced, but the flow velocity varies on the downstream side of the duct. Therefore, In some cases, downstream equipment such as heat transfer pipes may be adversely affected. Due to the unevenness of the aforementioned flow rate, there may be cases where the local denitration efficiency is lowered.

The present invention has been developed in view of such a situation, and an object thereof is to provide a denitration device capable of reducing pressure loss and equalizing the flow velocity distribution of the gas flowing out from the outlet side of the duct. [means to solve the problem]

In order to solve the said subject, the denitration apparatus of this invention employs the following means. The denitration device according to some embodiments of the present invention is provided with: a conduit for gas to flow in; and a denitration reactor arranged in the conduit, the denitration reactor has a plurality of modules, and these modules It has a catalyst that reacts with the gas flowing into the conduit to remove nitrogen oxides in the gas, the plurality of modules are arranged in a pleated shape, and between the plurality of modules, the inflow In the direction of the flow of the gas in the conduit, a plurality of impedance bodies are arranged at equal intervals so as to be parallel to each other.

In the denitration device of some embodiments of the present invention, since the module having the catalyst of the denitration reactor has a pleated structure, the reaction area between the gas and the catalyst can be increased, and the reduction of the gas through the denitration reactor can be reduced. The flow rate of the gas in the nitrile reactor. Thereby, the pressure loss can be reduced. By arranging the impedance bodies at equal intervals so as to be parallel to each other between the modules, pressure loss can be applied to the gas flowing into the duct, thereby making it possible to equalize the flow velocity distribution of the gas flowing out of the duct outlet side. Therefore, it is possible to suppress the influence on downstream equipment due to the change of the heat transfer performance of the heat transfer pipe depending on the location.

The denitration device according to some embodiments of the present invention is provided with: a conduit for gas to flow in; and a denitration reactor arranged in the conduit, the denitration reactor has a plurality of modules, and these modules It has a catalyst that reacts with the gas flowing into the duct to remove nitrogen oxides in the gas, and the plurality of modules are inclined to the direction of the flow of the gas flowing into the duct and mutually In parallel arrangement, between the plurality of modules, in the direction of the flow of the gas flowing into the conductor, a plurality of impedance bodies are arranged at equal intervals so as to be parallel to each other.

In the denitration apparatus according to some embodiments of the present invention, since the denitration reactor has a plurality of modules, the modules are configured to be inclined with respect to the flow direction of the gas flowing into the duct and arranged in parallel to each other. (semi-pleated structure), therefore, the reaction area between the gas and the catalyst can be increased, and the flow rate of the gas passing through the denitration reactor can be reduced. Thereby, the pressure loss can be reduced. By arranging the impedance bodies at equal intervals so as to be parallel to each other between the modules, pressure loss can be applied to the gas flowing into the duct, thereby making it possible to equalize the flow velocity distribution of the gas flowing out of the duct outlet side. Therefore, it is possible to suppress the influence on downstream equipment due to the change of the heat transfer performance of the heat transfer pipe depending on the location.

In the aforementioned denitration device, the aforementioned impedance system is a catalyst sheet having the aforementioned catalyst, and the aforementioned module preferably includes the aforementioned catalyst more closely than the aforementioned impedance body.

If the resistance body is a catalyst sheet, nitrogen oxides in the gas can also be removed by the resistance body, so that the denitration efficiency of the gas flowing into the conduit can be improved. If the module has a catalyst closer than the impedance body, the reaction area with the gas flowing into the conduit can be sufficiently secured, so the denitration efficiency of the gas can be further improved, and the pressure can also be sufficiently reduced damage.

In the above-mentioned denitration device, it is preferable that the above-mentioned impedance system does not have the above-mentioned flakes of the above-mentioned catalyst.

In some embodiments of the present invention, the impedance body may be a sheet without a catalyst, for example, a filter, a metal rectifier sheet, etc. can be used as the impedance body of the present invention. In some embodiments of the present invention, a sheet without a catalyst can be used as an impedance body, thereby reducing pressure loss and equalizing the flow velocity distribution of the gas flowing in from the outlet side of the duct.

In the above-mentioned denitration device, it is preferable that the above-mentioned impedance body is not arranged between a part of the above-mentioned plural modules.

In the denitration apparatuses according to some embodiments of the present invention, even if the resistive body is not arranged between some modules, the flow velocity distribution of the gas flowing out from the outlet side of the duct can be sufficiently equalized. Since the impedance body may not be arranged between some modules, the cost can be reduced.

Further, a denitration apparatus according to some embodiments of the present invention is a denitration apparatus including: a conduit into which gas flows; and a denitration reactor arranged in the conduit, wherein the denitration reactor is a There are a plurality of modules, the modules have catalysts that react with the gas that has flowed into the conduit to remove nitrogen oxides in the gas, and the modules are arranged in a pleated shape, On the surface of the outlet side of the conduit of the plurality of modules, the plurality of rectifier plates are arranged so as to be parallel to the flow direction of the gas so as not to come into contact with the plurality of modules.

In the denitration device of some embodiments of the present invention, by making the module having the catalyst in the denitration reactor a pleated structure, the reaction area between the gas and the catalyst can be increased, and the reaction area of the catalyst can be reduced. The flow rate of the gas through the denitration reactor. Thereby, the pressure loss can be reduced. On the surface of the outlet side of the module, the flow velocity of the gas on the outlet side of the module can be equalized by arranging a plurality of rectifier plates in parallel with the direction of the gas flow. Thereby, the static pressure on the outlet side of the module can be equalized. By arranging the plurality of rectifier plates so as not to come into contact with the plurality of modules, that is, by forming a gap between the upstream end of each rectifier plate and each module, it is possible to prevent the rectifier plate and the module from coming into contact near the junction. , locally reducing the flow rate of the gas in the module and causing flow rate imbalance. Therefore, since the flow velocity of the gas in the denitration device can be equalized, the denitration efficiency can be improved.

In the denitration device, it is preferable that a blade protruding toward the inlet side of the duct is provided at the end portion on the inlet side of the duct of the plurality of modules.

If such a blade is provided, the gas flowing into the duct can be guided to the opening on the inlet side of the duct of the pleated module. Thereby, in the vicinity of the end portion on the inlet side of the conduit of the module, the decrease in the flow velocity of the gas in the module can be alleviated. Thereby, the denitration efficiency can be further improved.

In the denitration device, the blade is curved in an arc shape that is convex toward the inlet side of the duct, or a V shape that protrudes toward the upstream side of the gas and narrows in width.

In this way, in the denitration apparatus according to some embodiments of the present invention, the shape of the blade can be made into a shape such as an arc shape, a V shape, or the like as described above. [Inventive effect]

According to the denitration device of the present invention, the pressure loss can be reduced, and the flow velocity distribution of the gas flowing out from the outlet side of the duct can be equalized.

Hereinafter, one embodiment of the denitration apparatus according to the present invention will be described with reference to the drawings.

Hereinafter, the first embodiment of the present invention will be described with reference to FIG. 1 . The denitration apparatus 1 shown in FIG. 1 is equipped with the pipe|tube 2 into which the gas flows, and the denitration reactor 3 arrange|positioned in the pipe|pipe 2. The arrows in Figure 1 show the direction of gas inflow.

The denitration reactor 3 has a plurality of modules 4, and the modules have catalysts that react with the gas that has flowed into the conduit 2 to remove nitrogen oxides in the gas, and the plurality of modules 4 are arranged In a pleated shape (arranged in a zigzag shape). The plurality of modules 4 are formed with a pleated inlet face 41 and a pleated outlet face 42, and the gas passages delimited by the inner partition walls of the plurality of modules 4 extend from the pleated inlet face 41 to the pleated outlet face 42. . The pleated inlet face 41 and the inlet face 43 of the denitration reactor 3 form an angle δ (0°<δ<90°). In the present embodiment, as shown in FIG. 1 , as an example, the module 4 in which the pleating inlet surface 41 and the pleating outlet surface 42 are parallel is shown. In this way, since the module 4 with the catalyst of the denitration reactor 3 has a pleated structure, the reaction area between the gas and the catalyst can be increased, and the flow rate of the gas passing through the denitration reactor 3 can be reduced. Thereby, the pressure loss can be reduced.

Between the plurality of modules 4, in the direction of the flow of the gas flowing into the conduit 2, the plurality of impedance bodies 5 are arranged in parallel with each other at equal intervals. In this way, by arranging the impedance bodies 5 at equal intervals so as to be parallel to each other between the modules 4, the pressure loss can be applied to the gas flowing into the duct 2, and thereby the gas flowing out from the outlet side of the duct 2 can be made to flow. to equalize the flow distribution. Therefore, it is possible to suppress the influence on downstream equipment due to the change of the heat transfer performance of the heat transfer pipe depending on the location.

When the plurality of modules 4 are arranged in a pleated shape as shown in FIG. 1 , it is preferable that the impedance body 5 is formed in a triangular shape. By making the impedance body 5 into a triangular shape, the impedance body 5 can be symmetrically arranged on the upstream side and the downstream side of the denitration reactor 3 . Thereby, when the gas has passed through the denitration reactor 3, the pressure loss of each flow path can be made equal.

The impedance body 5 is a catalyst sheet with the aforementioned catalyst, and the module 4 is preferably one that has the catalyst more closely than the impedance body 5 . If the resistance body 5 is a catalyst sheet, nitrogen oxides in the gas can also be removed by the resistance body 5 , so that the denitration efficiency of the gas flowing into the conduit 2 can be improved. If the module 4 has a catalyst closer than that of the impedance body 5, the reaction area with the gas flowing into the conduit 2 can be sufficiently ensured, so the denitration efficiency of the gas can be further improved, and the to reduce pressure loss.

The impedance body 5 may also be a sheet without a catalyst. In the present embodiment, the impedance body 5 may be a sheet without a catalyst, and for example, a filter, a metal rectifier sheet, or the like can be used as the impedance body 5 of the present embodiment. In particular, if the impedance body 5 has a triangular shape and does not have a catalyst sheet, it is easy to manufacture.

In the present embodiment, a sheet without a catalyst can be used as the resistance body 5 as described above, whereby the pressure loss can be reduced and the flow velocity distribution of the gas flowing in from the outlet side of the duct 2 can be equalized.

It is preferable that the impedance body 5 is not arranged between some of the plurality of modules 4 . In the denitration apparatus 1 of the present embodiment, even if the resistance body 5 is not arranged between some of the modules 4, the flow velocity distribution of the gas flowing out from the outlet side of the duct 2 can be sufficiently equalized. Since the impedance body 5 may not be arranged between some of the modules 4, the cost can be reduced.

Reference numeral 6 in FIG. 1 shows an arrangement space of a conventional plate catalyst. In the present embodiment, as can be seen from FIG. 1 , the space-saving of the denitration reactor 3 can be further improved compared with the conventional plate catalyst.

As described above, according to the denitration apparatus of the present embodiment, the pressure loss can be reduced, and the flow velocity distribution of the gas flowing out from the outlet side of the duct can be equalized.

Next, a second embodiment of the present invention will be described with reference to FIG. 2 . The same parts as those in FIG. 1 of the first embodiment are denoted by the same reference numerals in FIG. 2 , and a part of the descriptions of the same structures as those of the first embodiment are omitted. The denitration apparatus 11 shown in FIG. 2 is provided with the conduit|pipe 2 into which the gas flows, and the denitration reactor 13 arrange|positioned in the conduit|pipe 2. The arrows in Figure 2 show the direction of gas inflow.

The denitration reactor 13 has a plurality of modules 14, the modules have catalysts that react with the gas that has flowed into the conduit 2 to remove nitrogen oxides in the gas, and the plurality of modules 14 are for The directions of the flow of the gas flowing into the duct 2 are inclined and arranged parallel to each other. As described above, since the plurality of modules 14 are arranged in parallel to each other (semi-pleated structure) inclined with respect to the flow direction of the gas flowing into the duct 2, the reaction area between the gas and the catalyst can be increased. The flow rate of the gas through the denitration reactor 13 can be increased and can be decreased. Thereby, the pressure loss can be reduced.

Between the plurality of modules 14 , the plurality of impedance bodies 15 are arranged at equal intervals in parallel to each other in the direction of the flow of the gas flowing into the conduit 2 . In this way, by arranging the impedance bodies 15 at equal intervals so as to be parallel to each other between the modules 14 , the pressure loss can be applied to the gas flowing into the duct 2 , and thereby the gas flowing out from the outlet side of the duct 2 can be made to flow. to equalize the flow distribution. Therefore, it is possible to suppress the influence on downstream equipment due to the change of the heat transfer performance of the heat transfer pipe depending on the location.

When the plurality of modules 14 are arranged in a semi-pleated shape as shown in FIG. 2 , the shape of the resistance body 15 is, for example, triangular at both ends of the denitration reactor 13 . The parts other than the two ends of the , are preferably made into a parallelogram. Thereby, when the gas has passed through the denitration reactor 13, the pressure loss of each flow path can be made equal.

Similar to the first embodiment, the impedance body 15 is a catalyst sheet having a catalyst, and the module 14 is preferably one that includes the catalyst more closely than the impedance body 15 . The impedance body 15 may also be a thin sheet without a catalyst.

Like the first embodiment, it is preferable that the impedance body 15 is not arranged between some of the plural modules 14 .

Reference numeral 6 in FIG. 2 indicates an arrangement space of a conventional plate catalyst. In the present embodiment, as can be seen from FIG. 2 , the space saving of the denitration reactor 13 can be improved compared with the conventional plate catalyst.

As described above, according to the denitration apparatus of the present embodiment, the pressure loss can be reduced, and the flow velocity distribution of the gas flowing out from the outlet side of the duct can be equalized.

Next, a third embodiment of the present invention will be described with reference to FIGS. 7A to 7C . 7A to 7C , which are the same as those in FIG. 1 of the first embodiment, are denoted by the same reference numerals, and a part of the description of the same configuration as that of the first embodiment is omitted. 7A to 7C are diagrams showing the denitration apparatus of the present embodiment, FIG. 7A is a perspective view of the denitration reactor, FIG. 7B is a cross-sectional view showing a part of the denitration apparatus, and FIG. 7C is a dashed line in FIG. 7B . An enlarged cross-sectional view of the part surrounded by the four corners. The arrows in Figure 7A show the direction of gas inflow.

As shown in FIGS. 7A and 7B , in the denitration apparatus 21 of the present embodiment, the denitration reactor 23 includes a plurality of modules 4 arranged in a pleated shape. On the surface of the outlet side of the ducts of the plurality of modules 4, the plurality of rectifying plates 27 are arranged so as not to be in contact with the plurality of modules 4 through a frame (not shown) so as to be parallel to the flow direction of the gas. , a gap is formed between the upstream end of each rectifying plate 27 and each module 4 . In particular, the rectifying plate 27 arranged on the most downstream side in the direction of gas flow is arranged so that the downstream end portion thereof protrudes further downstream than the downstream end portion of the module 4 .

Here, as shown in FIG. 7C , when the thickness of the module 4 in the plate thickness direction is t, a plurality of rectifier plates 27 are respectively arranged so that the shortest distance between the rectifier plate 27 and the module 4 is 0.2t. . When the distance from the openings of the plurality of modules 4 to the apex is set to 1, the rectifier plate 27 arranged on the most downstream side in the direction of the gas flow is arranged so that the downstream end portion is smaller than the module 4. The end of the downstream side protrudes further toward the downstream side by 0.0831.

A plurality of vanes 28 protruding toward the inlet side of the duct are provided at the ends of the plurality of modules 4 on the inlet side of the duct. The shape of the blade 28 is curved so as to be convex toward the inlet side of the duct.

Next, as shown in FIGS. 8 to 10 , the influence on the flow velocity, static pressure, etc. of the gas when denitration is performed using the denitration device 21 of FIG. 7B will be specifically described. FIG. 8 is a diagram showing the flow rate of the gas flowing into the denitration device of FIG. 7B in contour lines. The arrows in FIG. 8 indicate the direction in which the gas flows (the same applies to FIG. 10 described later). As indicated by the area A' indicated by the arrow in FIG. 8 , when viewed from the outlet side of the duct, the gas flow concentration is eliminated on the pleated valley side of the plurality of modules 4, so that the The unevenness of the flow rate of the gas is reduced.

Fig. 9 is a graph showing the relationship between the flow velocity distribution of the gas in the module 4 from the point a' to the point b' in Fig. 8 and the width direction of the dimensionless catalyst. In Fig. 9, the vertical axis shows the flow velocity (m/s) of the gas in the module (catalyst) 4, the horizontal axis shows the dimensionless catalyst width direction, and the opening part (a' in Fig. 8) It is set to 0, and the vertex part (b' point in FIG. 8 ) is set to 1.

As shown in FIG. 9 , as compared with FIG. 13 , it can be seen that the change in the flow velocity of the gas becomes smaller from the opening portion of the module 4 to the apex portion. The difference between the flow velocity of the gas near the opening of the module 4 and the flow velocity of the gas near the apex is about 1.5 m/s. Therefore, it can also be known from this situation that in the module 4, from the opening to the apex, The unevenness of the flow velocity of the gas becomes smaller. Therefore, since the flow velocity of the gas in the module 4 becomes uniform as a whole, it can be determined that the denitration efficiency of the gas is improved in the entire module 4 .

FIG. 10 is a diagram showing the static pressure of the case where the gas is allowed to flow into the denitration device of FIG. 7B by contour lines. As shown in the area B' shown in FIG. 10, it can be seen that a pressure gradient from the inlet side of the duct toward the outlet side is generated in the vicinity of the surface of the outlet side of the duct of the module 4. That is, it can be seen that the static pressure on the outlet side of the conduit of the module 4 is equalized.

According to the above description, according to this embodiment, the following effects can be achieved. In the denitration device 21 of the present embodiment, since the module 4 having the catalyst of the denitration reactor 23 has a pleated structure, the reaction area between the gas and the catalyst can be increased, and the reduction in the amount of gas passing through the denitration can be reduced. The flow rate of the gas in the reactor 23. Thereby, the pressure loss can be reduced. The flow velocity of the gas at the outlet side of the module 4 can be equalized by arranging a plurality of rectifier plates 27 on the surface of the outlet side of the module 4 so as to be parallel to the flow direction of the gas. Thereby, the static pressure on the outlet side of the module 4 can be equalized. By arranging the plurality of rectifier plates 27 so as not to come into contact with the plurality of modules 4, that is, by forming a gap between the upstream end of each rectifier plate 27 and each module 4, it is possible to prevent the rectifier plates 27 from being in contact with the modules 4. Near the junction of group 4, the flow rate of gas in module 4 is locally reduced to cause flow rate imbalance. Therefore, since the flow velocity of the gas in the denitration device 21 can be equalized, the denitration efficiency can be improved.

If the vane 28 is provided, the gas flowing into the duct can be guided to the opening on the inlet side of the duct of the module 4 arranged in a pleated shape. Thereby, in the vicinity of the end portion on the inlet side of the conduit of the module 4, the reduction in the flow velocity of the gas in the module 4 can be alleviated. Thereby, the denitration efficiency can be further improved.

As shown in the present embodiment, the shape of the blade 28 can be, for example, the arc-shaped shape as described above.

In the present embodiment, the rectifying plate 27 is arranged so that the end portion thereof protrudes further toward the downstream side than the end portion on the downstream side of the module 4 . As a result, at the apex portion of the module 4, the flow velocity of the gas can be suppressed from becoming extremely large.

In the present embodiment, the case where the shortest distance between the rectifier plate 27 and the module 4 is set to 0.2t has been described as an example, but the present invention is not limited to this. Ideally, the shortest distance between the rectifier plate 27 and the module 4 is set in the range of 0.1t to 1.0t.

In the present embodiment, the case where the downstream end portion of the rectifying plate 27 protrudes more downstream than the downstream end portion of the module 4 by 0.083 l is described as an example, but the present invention is not limited to this. It is desirable that the downstream end portion of the rectifying plate 27 is set to protrude more downstream than the downstream end portion of the module 4 by a range of 0.01 l to 0.2 l.

Next, a fourth embodiment of the present invention will be described with reference to FIG. 11 . The basic structure of this embodiment is basically the same as that of the third embodiment, and the difference from the third embodiment is that a V-shaped blade 38 is provided instead of the arc-shaped blade 28 . Therefore, in the present embodiment, only the different parts will be described, and the description of other overlapping parts will be omitted here. The same components as those of the first embodiment are assigned the same reference numerals, and their overlapping descriptions are omitted.

Fig. 11 is a cross-sectional view showing a part of the denitration apparatus of the present embodiment. As shown in FIG. 11 , the denitration reactor 33 included in the denitration device 31 of the present embodiment is provided with a V-shaped blade 38 (a part not shown in the figure) that protrudes toward the upstream side of the gas and has a narrow width. Show).

According to the above description, according to this embodiment, the following effects can be achieved. As shown in the present embodiment, the shape of the blade 38 can be, for example, the V-shaped shape as described above. If it is the V-shaped vane 38 as described above, the vane 38 can be designed only by arranging a linear plate, so the design is easy.

1, 11, 21, 31‧‧‧Denitration device 2‧‧‧Catheter 3, 13, 23, 33, 103‧‧‧Denitration reactor 4, 14, 104‧‧‧Module 5. 15‧‧‧Impedance body 6‧‧‧Disposition space of conventional plate catalysts 27‧‧‧Rectifier 28, 38‧‧‧ Blades 41‧‧‧Pleated entry face 42‧‧‧Pleated exit surface 43‧‧‧(DeNOx Reactor) Inlet face 110‧‧‧Frame δ‧‧‧angle P‧‧‧arrow

Fig. 1 is a cross-sectional view showing a denitration apparatus according to a first embodiment of the present invention. Fig. 2 is a cross-sectional view showing a denitration apparatus according to a second embodiment of the present invention. Figure 3 is an oblique view showing a denitration reactor in which the modules are arranged in a pleated shape. FIG. 4 is a schematic diagram showing the flow direction of the gas through the module shown with oblique lines in FIG. 3 . FIG. 5 is a graph showing the results of investigating the flow velocity distribution of the gas flowing in the denitration reactor of FIG. 3 . FIG. 6 is a graph showing the relationship between the flow velocity distribution of the gas obtained in FIG. 5 and the dimensionless position. Fig. 7A is a diagram showing a denitration apparatus according to a third embodiment of the present invention, and is a perspective view of a denitration reactor. Fig. 7B is a view showing a denitration apparatus according to a third embodiment of the present invention, and is a cross-sectional view showing a part of the denitration apparatus. Fig. 7C is a view showing the denitration apparatus according to the third embodiment of the present invention, and is an enlarged cross-sectional view of the part surrounded by the four corners of the broken line in Fig. 7B . FIG. 8 is a diagram showing the flow rate of the gas flowing into the denitration device of FIG. 7B in contour lines. Fig. 9 is a graph showing the relationship between the flow velocity distribution of the gas in the module from the point a' to the point b' in Fig. 8 and the width direction of the dimensionless catalyst. FIG. 10 is a diagram showing the static pressure of the case where the gas is allowed to flow into the denitration device of FIG. 7B by contour lines. Fig. 11 is a cross-sectional view showing a part of a denitration apparatus according to a fourth embodiment of the present invention. FIG. 12 is a graph showing the flow velocity of the gas in the vicinity of the module shown by the oblique lines in FIG. 3 as contour lines. FIG. 13 is a graph showing the relationship between the flow velocity distribution of the gas in the module from point a to point b in FIG. 12 and the width direction of the dimensionless catalyst. FIG. 14 is a graph showing the static pressure in the vicinity of the module shown by the oblique lines in FIG. 3 as contour lines.

4‧‧‧Module

21‧‧‧Denitration device

23‧‧‧Denitration reactor

27‧‧‧Rectifier

28‧‧‧Blade

Claims (3)

A denitration device is provided with: a conduit for inflowing gas; and a denitration reactor arranged in the conduit, characterized in that: the denitration reactor has a plurality of modules, and the modules have the same The gas flowing into the duct reacts with the catalyst for removing nitrogen oxides in the gas. The plurality of modules are arranged in a pleated shape, and between the plurality of modules, the gas flows into the duct. In the direction of the flow of the gas inside, a plurality of impedance bodies are arranged at equal intervals in a manner parallel to each other, the impedance system is a catalyst sheet with the catalyst, and the module is closer than the impedance body. catalyst. A denitration device is provided with: a conduit for inflowing gas; and a denitration reactor arranged in the conduit, characterized in that: the denitration reactor has a plurality of modules, and the modules have the same The gas flowing into the duct reacts with a catalyst for removing nitrogen oxides in the gas, and the plurality of modules are arranged parallel to and inclined to the direction of the flow of the gas that has flowed into the duct , between the plurality of modules, in the direction of the flow of the gas flowing into the conduit, a plurality of impedance bodies are arranged in parallel with each other at equal intervals, The aforementioned impedance system is a catalyst sheet having the aforementioned catalyst, and the aforementioned module has the aforementioned catalyst more closely than the aforementioned impedance body. The denitration device according to claim 1 or 2, wherein the impedance body is not arranged between a part of the plurality of modules.

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