JP6965191B2 - Denitration device - Google Patents

Description

The present disclosure relates to a denitration device applied to, for example, an exhaust gas treatment device.

For example, in a power generation facility such as a GTCC (Gas Turbine Combined Cycle) combined power generation facility, a denitration device has been used as a device for removing nitrogen oxides (NOx) from exhaust gas. In recent years, in order to improve plant efficiency and enhance competitiveness in denitration equipment, there has been a demand for low pressure loss of a module (catalyst module) having a catalyst used for denitration.

Conventionally, a honeycomb structure has been used as the catalyst module, but in the case of the honeycomb structure, it is necessary to increase the number of cells. Therefore, in order to reduce the pressure loss of the module, a denitration reactor in which the module is arranged in a pleated manner as shown in Patent Documents 1 and 2 has been reported. When the modules are arranged in a pleated shape, it is necessary to shorten the length, but the flow velocity of the gas passing through the modules can be reduced, so that the pressure loss can be reduced.

International Publication No. 2016/0190050 Japanese Unexamined Patent Publication No. 2006-122873

FIG. 3 shows a perspective view showing a denitration reactor in which modules are arranged in a pleated manner as described in Patent Documents 1 and 2, and a method of flowing gas through the denitration reactor will be described in more detail. In the denitration reactor 103 shown in FIG. 3, a plurality of modules 104 are arranged in a pleated shape (fold shape) in the frame body 110. In the denitration reactor 103, the gas flows into the denitration reactor 103 in the direction indicated by the arrow in FIG.

Next, FIG. 4 shows a schematic view showing the flow direction of the gas passing through the module indicated by the diagonal line in FIG. The solid arrow in FIG. 4 indicates the direction in which the gas flows, and the wavy arrow in FIG. 4 indicates the direction in which the gas passes through the module 104. As shown in FIG. 4, the module 104 is tilted by an angle δ (0 ° <δ <90 °) from the axis perpendicular to the gas flow direction. Therefore, the gas flowing into the denitration reactor 103 passes through the module 104 at an angle of δ as shown by the wavy arrow in FIG.

Here, FIG. 5 shows a diagram showing the results of examining the flow velocity distribution of the gas flowing through the denitration reactor of FIG. As shown in FIG. 5, for the modules arranged in a pleated shape, the gas passing through the module becomes sparse and the flow velocity becomes relatively low on the front side (the mountain side of the pleats) when viewed from the direction of the arrow P. .. On the other hand, on the inner side (valley side of the pleats) when viewed from the direction of the arrow P, the gas passing through the module becomes dense and the flow velocity becomes relatively high. Therefore, it can be seen that in the gas that has passed through the denitration reactor, the pleated-type flow velocity varies depending on the arrangement of the pleated modules.

FIG. 6 is a graph showing the relationship between the flow velocity distribution of the gas obtained in FIG. 5 and the dimensionless position. In FIG. 6, the vertical axis represents the vertical velocity (m / s) of the gas, and the horizontal axis represents the dimensionless position. From FIG. 6, it can be seen that when the gas passes through the denitration reactor 103 as shown in FIG. 3, the pleated-type flow velocity varies in the passed gas. Such variations in the flow velocity of the gas may adversely affect the wake equipment (for example, the heat transfer performance of the heat transfer tube may change depending on the location).

FIG. 12 is a contour line showing the flow velocity of the gas in the vicinity of the module indicated by the diagonal line in FIG. The arrow in FIG. 12 indicates the direction in which the gas flows in (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 the gas flow velocity is increased on the valley side of the pleats in the plurality of modules 104 when viewed from the outlet side of the duct because the gas flow is concentrated.

FIG. 13 is a graph showing the relationship between the flow velocity distribution of the gas in the module 104 from the point a to the point b in FIG. 12 and the dimensionless catalyst width direction. In FIG. 13, the vertical axis indicates the flow velocity (m / s) of the gas in the module (catalyst) 104, the horizontal axis indicates the dimensionless catalyst width direction, and the opening (point a in FIG. 12) is shown. It is set to 0, and the apex portion (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.

On the other hand, 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 maximum in the vicinity of the apex of the module 104. Specifically, the difference between the gas flow velocity near the opening of the module 104 and the gas flow velocity near the apex is about 2.75 m / s. Further, since the amount of gas passing through the module 104 is large in the vicinity of the apex of the module 104, it can be determined that the denitration of the gas is not sufficiently performed here and the denitration efficiency is low.

FIG. 14 is a contour line showing the static pressure in the vicinity of the module indicated by the diagonal line in FIG. As shown in the region B shown in FIG. 14, it can be seen that a pressure gradient from the inlet side to the outlet side of the duct is generated in the vicinity of the surface on the outlet side of the duct in the module 104.

As described above, when the denitration reactor in which the modules are arranged in a pleated manner as in Patent Documents 1 and 2 described above is used, the pressure loss can be reduced, but the flow velocity varies on the downstream side of the duct. This may adversely affect the wake equipment such as the heat transfer tube. In addition, the above-mentioned variation in the flow velocity may cause a local decrease in denitration efficiency.

The present disclosure has been made in view of such circumstances, and provides a denitration device capable of reducing pressure loss and making the flow velocity distribution of gas flowing out from the duct outlet side uniform. The purpose is to do.

In order to solve the above problems, the denitration device of the present disclosure employs the following means.
The denitration apparatus according to some embodiments of the present disclosure includes a duct through which gas flows and a denitration reactor arranged in the duct, and the denitration reactor comprises the gas flowing into the duct. It has a plurality of modules having a catalyst for removing nitrogen oxides in the gas by reacting with the above, and the plurality of modules are arranged in a pleated shape, and the above-mentioned is sandwiched between the plurality of modules. A plurality of resistors are arranged at equal intervals so as to be parallel to each other in the direction in which the gas flowing into the duct flows, the resistors are catalyst sheets having the catalyst, and the module is , The catalyst is denser than the resistor .

In the denitration apparatus according to some embodiments of the present disclosure, since the module having the catalyst in the denitration reactor has a pleated structure, the reaction area between the gas and the catalyst can be increased and the denitration reaction can be performed. The flow velocity of the gas passing through the reactor can be reduced. Thereby, the pressure loss can be reduced. Further, since the resistors are arranged at equal intervals between the modules so as to be parallel to each other, a pressure loss can be applied to the gas flowing into the duct, which causes the gas to flow out from the duct outlet side. It is possible to make the flow velocity distribution of the gas to be uniform. Therefore, it is possible to suppress the influence on the wake equipment such that the heat transfer performance of the heat transfer tube changes depending on the location.
Further, if the resistor is a catalyst sheet, nitrogen oxides in the gas can be removed by the resistor as well, so that the denitration efficiency of the gas flowing into the duct can be improved. Further, if the module has a catalyst denser than the resistor, a sufficient reaction area with the gas flowing into the duct can be secured, so that the denitration efficiency of the gas can be further improved. , Pressure loss can also be sufficiently reduced.

Further, the denitration apparatus according to some embodiments of the present disclosure includes a duct through which gas flows and a denitration reactor arranged in the duct, and the denitration reactor has flowed into the duct. It has a plurality of modules having a catalyst for reacting with the gas to remove nitrogen oxides in the gas, and the plurality of modules are inclined with respect to the flow direction of the gas flowing into the duct. And are arranged parallel to each other, and are arranged at equal intervals between the plurality of modules so that the plurality of resistors are parallel to each other in the direction in which the gas flowing into the duct flows. The resistor is a catalyst sheet having the catalyst, and the module has the catalyst more densely than the resistor .

In the denitration apparatus according to some embodiments of the present disclosure, the denitration reactor has a plurality of modules, and these modules are inclined with respect to the flow direction of the gas flowing into the duct. Since the structure is arranged parallel to each other (semi-pleated structure), the reaction area between the gas and the catalyst can be increased, and the flow velocity of the gas passing through the denitration reactor can be reduced. .. Thereby, the pressure loss can be reduced. Further, since the resistors are arranged at equal intervals between the modules so as to be parallel to each other, a pressure loss can be applied to the gas flowing into the duct, which causes the gas to flow out from the duct outlet side. It is possible to make the flow velocity distribution of the gas to be uniform. Therefore, it is possible to suppress the influence on the wake equipment such that the heat transfer performance of the heat transfer tube changes depending on the location.
Further, if the resistor is a catalyst sheet, nitrogen oxides in the gas can be removed by the resistor as well, so that the denitration efficiency of the gas flowing into the duct can be improved. Further, if the module has a catalyst denser than the resistor, a sufficient reaction area with the gas flowing into the duct can be secured, so that the denitration efficiency of the gas can be further improved. , Pressure loss can also be sufficiently reduced.

In the denitration device, the resistor is preferably a sheet without the catalyst.

In some embodiments of the present disclosure, the resistor may be a catalyst-free sheet, and for example, a filter, a metal rectifying sheet, or the like can be used as the resistor in the present disclosure. In some embodiments of the present disclosure, such a catalyst-free sheet can be used as a resistor, which can reduce pressure loss and make the flow velocity distribution of the gas flowing out from the duct outlet side uniform. Can be transformed into.

In the denitration device, it is preferable that the resistor is not arranged between some of the plurality of modules.

In the denitration device according to some embodiments of the present disclosure, the flow velocity distribution of the gas flowing out from the duct outlet side is sufficiently uniform even when the resistor is not arranged between some modules. can do. Further, since it is not necessary to arrange a resistor between some modules, the cost can be reduced.

Further, the denitration device according to some embodiments of the present disclosure is a denitration device including a duct through which gas flows and a denitration reactor arranged in the duct. The denitration reactor is the duct. It has a plurality of modules having a catalyst for removing nitrogen oxides in the gas by reacting with the gas flowing into the gas, and the plurality of modules are arranged in a pleated shape, and the plurality of modules are arranged in a pleated shape. On the outlet side surface of the duct in the above, a plurality of rectifying plates are arranged so as to be parallel to the flow direction of the gas so as not to be in contact with the plurality of modules.

In the denitration apparatus according to some embodiments of the present disclosure, the module having the catalyst in the denitration reactor has a pleated structure, so that the reaction area between the gas and the catalyst can be increased and the denitration can be performed. The flow velocity of the gas passing through the reactor can be reduced. Thereby, the pressure loss can be reduced. Further, since a plurality of straightening vanes are arranged on the surface on the outlet side of the module so as to be parallel to the direction in which the gas flows, the flow velocity of the gas on the outlet side of the module can be made uniform. As a result, the static pressure on the outlet side of the module can be made uniform. Further, since the plurality of straightening vanes are arranged so as not to come into contact with the plurality of modules, that is, a gap is formed between the upstream end of each straightening vane and each module, the straightening vanes and the modules It is possible to prevent the flow velocity of the gas in the module from being locally reduced in the vicinity of the contact point of the module and inducing a flow velocity imbalance. Therefore, since the flow velocity of the gas in the denitration device can be made uniform, the denitration efficiency can be improved.

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

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

In the denitration device, the shape of the vane is an arc shape curved so as to be convex toward the inlet side of the duct or a V shape that protrudes toward the upstream side of the gas and narrows its width. Is preferable.

As described above, in the denitration device according to some embodiments of the present disclosure, the shape of the vane can be, for example, an arc shape or a V shape as described above.

With the denitration device of the present disclosure, it is possible to reduce the pressure loss and to make the flow velocity distribution of the gas flowing out from the duct outlet side uniform.

It is sectional drawing which shows the denitration apparatus which concerns on 1st Embodiment of this disclosure. It is sectional drawing which shows the denitration apparatus which concerns on 2nd Embodiment of this disclosure. It is a perspective view which shows the denitration reactor which arranged the module in a pleated shape. It is the schematic which shows the flow direction of the gas passing through the module shown by the diagonal line in FIG. It is a figure which shows the result of having investigated the flow velocity distribution of the gas flowing through the denitration reactor of FIG. It is a graph which shows the relationship between the flow velocity distribution of the gas obtained in FIG. 5 and a dimensionless position. It is a figure which shows the denitration apparatus which concerns on 3rd Embodiment of this disclosure. It is an enlarged cross-sectional view of the part surrounded by the square. FIG. 7B is a contour line showing the flow velocity of the gas when the gas is passed through the denitration device of FIG. 7B. It is a graph which shows the relationship between the flow velocity distribution of the gas in a module from the point a'to the point b'in FIG. 8 and the dimensionless catalyst width direction. FIG. 7B is a contour line showing the static pressure when gas is passed through the denitration device of FIG. 7B. It is sectional drawing which shows a part of the denitration apparatus which concerns on 4th Embodiment of this disclosure. It is the figure which showed the flow velocity of the gas in the vicinity of the module shown by the diagonal line in FIG. 3 by a contour line. It is a graph which shows the relationship between the flow velocity distribution of the gas in a module from the point a to the point b in FIG. 12 and the dimensionless catalyst width direction. It is the figure which showed the static pressure in the vicinity of the module shown by the diagonal line in FIG. 3 by a contour line.

Hereinafter, an embodiment of the denitration device according to the present disclosure will be described with reference to the drawings.

Hereinafter, the first embodiment of the present disclosure will be described with reference to FIG.
The denitration device 1 shown in FIG. 1 includes a duct 2 into which gas flows, and a denitration reactor 3 arranged in the duct 2. The arrow in FIG. 1 indicates the direction in which the gas flows.

The denitration reactor 3 has a plurality of modules 4 having a catalyst for removing nitrogen oxides in the gas by reacting with the gas flowing into the duct 2, and the plurality of modules 4 are arranged in a pleated shape. (Arranged in a zigzag pattern). The plurality of modules 4 form a pleated inlet surface 41 and a pleated outlet surface 42, and a gas passage defined by the internal partition walls of the plurality of modules 4 extends from the pleated inlet surface 41 to the pleated outlet surface 42. Further, the pleated inlet surface 41 and the inlet surface 43 of the denitration reactor 3 form an angle δ (0 ° <δ <90 °). In the present embodiment, as shown in FIG. 1, the module 4 in which the pleated inlet surface 41 and the pleated outlet surface 42 are parallel is shown as an example. In this way, since the module 4 having the catalyst in the denitration reactor 3 has a pleated structure, the reaction area between the gas and the catalyst can be increased, and the flow velocity of the gas passing through the denitration reactor 3 can be increased. It can be reduced. Thereby, the pressure loss can be reduced.

A plurality of resistors 5 are arranged at equal intervals between the plurality of modules 4 so that the plurality of resistors 5 are parallel to each other in the direction in which the gas flowing into the duct 2 flows. In this way, by arranging the resistors 5 at equal intervals between the modules 4 so as to be parallel to each other, it is possible to apply a pressure loss to the gas flowing into the duct 2, whereby the pressure loss can be applied. It is possible to make the flow velocity distribution of the gas flowing out from the duct 2 outlet side uniform. Therefore, it is possible to suppress the influence on the wake equipment such that the heat transfer performance of the heat transfer tube changes depending on the location.

When the plurality of modules 4 are arranged in a pleated shape as shown in FIG. 1, the resistor 5 preferably has a triangular shape. By forming the resistor 5 into a triangular shape, the resistors 5 can be symmetrically arranged on the upstream side and the downstream side of the gas in the denitration reactor 3. As a result, when the gas passes through the denitration reactor 3, the pressure loss in each flow path can be made equal.

Here, it is preferable that the resistor 5 is a catalyst sheet having a catalyst, and the module 4 has a catalyst more densely than the resistor 5. If the resistor 5 is a catalyst sheet, the nitrogen oxides in the gas can also be removed by the resistor 5, so that the denitration efficiency of the gas flowing into the duct 2 can be improved. Further, if the module 4 has a catalyst denser than the resistor 5, the reaction area with the gas flowing into the duct 2 can be sufficiently secured, so that the denitration efficiency of the gas can be further improved. It can be done, and the pressure loss can be sufficiently reduced.

Further, the resistor 5 may be a sheet having no catalyst. In the present embodiment, the resistor 5 may be a sheet having no catalyst, and for example, a filter, a metal rectifying sheet, or the like can be used as the resistor 5 in the present embodiment. In particular, if the resistor 5 has a triangular shape and does not have a catalyst, it can be easily manufactured.

In the present embodiment, the sheet having no catalyst can be used as the resistor 5, thereby reducing the pressure loss and making the flow velocity distribution of the gas flowing out from the outlet side of the duct 2 uniform. Can be done.

Further, it is preferable that the resistor 5 is not arranged between the plurality of modules 4. In the denitration device 1 of the present embodiment, even when the resistor 5 is not arranged between some modules 4, the flow velocity distribution of the gas flowing out from the outlet side of the duct 2 is sufficiently made uniform. Can be done. Further, since the resistor 5 does not have to be arranged between some modules 4, the cost can be reduced.

Reference numeral 6 in FIG. 1 indicates a space for arranging the conventional plate-shaped catalyst. In the present embodiment, as is clear from FIG. 1, the denitration reactor 3 can save space as compared with the conventional plate-shaped catalyst.

As described above, the denitration device of the present embodiment can reduce the pressure loss and make the flow velocity distribution of the gas flowing out from the duct outlet side uniform.

Next, the second embodiment of the present disclosure will be described with reference to FIG.
It should be noted that the same components as those in FIG. 1 which are the first embodiments are represented by the same reference numerals in FIG. 2, and a part of description is omitted for the same configurations as those in the first embodiment.
The denitration device 11 shown in FIG. 2 includes a duct 2 into which gas flows, and a denitration reactor 13 arranged in the duct 2. The arrow in FIG. 2 indicates the direction in which the gas flows.

The denitration reactor 13 has a plurality of modules 14 having a catalyst for removing nitrogen oxides in the gas by reacting with the gas flowing into the duct 2, and the plurality of modules 14 flow into the duct 2. It is inclined with respect to the flow direction of the gas and is arranged parallel to each other. As described above, since the plurality of modules 14 are inclined with respect to the flow direction of the gas flowing into the duct 2 and have a structure (semi-pleated structure) arranged in parallel with each other. The reaction area between the gas and the catalyst can be increased, and the flow velocity of the gas passing through the denitration reactor 13 can be reduced. Thereby, the pressure loss can be reduced.

A plurality of resistors 15 are arranged at equal intervals between the plurality of modules 14 so that the plurality of resistors 15 are parallel to each other in the direction in which the gas flowing into the duct 2 flows. In this way, by arranging the resistors 15 at equal intervals between the modules 14 so as to be parallel to each other, it is possible to apply a pressure loss to the gas flowing into the duct 2, whereby the pressure loss can be applied. It is possible to make the flow velocity distribution of the gas flowing out from the duct 2 outlet side uniform. Therefore, it is possible to suppress the influence on the wake equipment such that the heat transfer performance of the heat transfer tube changes depending on the location.

When a plurality of modules 14 are arranged in a semi-pleated shape as shown in FIG. 2, the shape of the resistor 15 is, for example, triangular at both ends of the denitration reactor 13 and other than both ends of the denitration reactor 13. The portion is preferably a parallelogram. As a result, when the gas passes through the denitration reactor 13, the pressure loss in each flow path can be made equal.

As in the first embodiment, it is preferable that the resistor 15 is a catalyst sheet having a catalyst, and the module 14 has a catalyst more densely than the resistor 15. Further, the resistor 15 may be a sheet having no catalyst.

Further, as in the first embodiment, it is preferable that the resistor 15 is not arranged between some of the plurality of modules 14.

Reference numeral 6 in FIG. 2 indicates a space for arranging the conventional plate-shaped catalyst. In the present embodiment, as is clear from FIG. 2, the denitration reactor 13 can save space as compared with the conventional plate-shaped catalyst.

As described above, the denitration device of the present embodiment can reduce the pressure loss and make the flow velocity distribution of the gas flowing out from the duct outlet side uniform.

Next, the third embodiment of the present disclosure will be described with reference to FIG.
It should be noted that the same components as those in FIG. 1, which is the first embodiment, are represented by the same reference numerals in FIG. 7, and a part of description is omitted for the same configurations as those in the first embodiment.
7A and 7B are views showing a denitration device according to the present embodiment, FIG. 7A is a perspective view of a denitration reactor, FIG. 7B is a cross-sectional view showing a part of the denitration device, and FIG. 7C is a cross-sectional view. (B) is an enlarged cross-sectional view of a portion surrounded by a dotted square in (b). The arrow in FIG. 7A indicates the direction in which the gas flows.

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 manner. On the outlet side surface of the duct in the plurality of modules 4, the plurality of straightening vanes 27 should not be in contact with the plurality of modules 4, that is, the upstream ends of the respective straightening vanes 27 so as to be parallel to the gas flow direction. It is arranged via a frame (not shown) so that a gap is formed between the modules 4 and the modules 4. In particular, the straightening vane 27 arranged on the most downstream side in the gas flow direction is arranged so that the downstream end thereof projects toward the downstream side of the downstream end 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 straightening vanes are arranged so that the shortest distance between the straightening vane 27 and the module 4 is 0.2t. 27 are arranged respectively. Further, when the distance from the opening to the apex of the plurality of modules 4 is l, the end of the straightening vane 27 arranged on the most downstream side in the gas flow direction is on the downstream side of the module 4. It is arranged so as to project toward the downstream side by 0.083 l from the end of the.

Further, at the end of the plurality of modules 4 on the inlet side of the duct, a plurality of vanes 28 protruding toward the inlet side of the duct are provided. The shape of the vane 28 is an arc shape curved so as to be convex toward the entrance side of the duct.

Next, FIGS. 8 to 10 will be shown, and the influence on the gas flow velocity and the static pressure when denitration is performed by applying the denitration device 21 of FIG. 7B will be specifically described.
FIG. 8 is a contour line showing the flow velocity of the gas when the gas is passed through the denitration device of FIG. 7 (b). The arrow in FIG. 8 indicates the direction in which the gas flows in (the same applies to FIG. 10 described later). As shown by the area A'indicated by the arrow in FIG. 8, the concentration of the gas flow is eliminated on the valley side of the pleats in the plurality of modules 4 when viewed from the outlet side of the duct, and the variation in the gas flow velocity is reduced. You can see that.

FIG. 9 is a graph showing the relationship between the flow velocity distribution of the gas in the module 4 from the a'point to the b'point in FIG. 8 and the dimensionless catalyst width direction. In FIG. 9, the vertical axis indicates the flow velocity (m / s) of the gas in the module (catalyst) 4, the horizontal axis indicates the dimensionless catalyst width direction, and the opening (point a'in FIG. 8). Is 0, and the apex portion (point b'in FIG. 8) is 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 is smaller from the opening to the apex of the module 4. Further, the difference between the gas flow velocity near the opening of the module 4 and the gas flow velocity near the apex is about 1.5 m / s, and from this, also from this, in the module 4, from the opening to the apex. It can be seen that the variation in the flow velocity of the gas becomes smaller toward the part. Therefore, since the flow velocity of the gas in the module 4 becomes more uniform as a whole, it can be determined that the denitration efficiency of the gas can be improved in the entire module 4.

FIG. 10 is a contour line showing the static pressure when gas is passed through the denitration device of FIG. 7 (b). As shown in the region B'shown in FIG. 10, it can be seen that a pressure gradient from the inlet side to the outlet side of the duct does not occur in the vicinity of the surface on the outlet side of the duct in the module 4. That is, it can be seen that the static pressure on the outlet side of the duct in the module 4 is made uniform.

According to the present embodiment, the following effects are exhibited by the configuration described above.
In the denitration apparatus 21 according to the present embodiment, since the module 4 having the catalyst in the denitration reactor 23 has a pleated structure, the reaction area between the gas and the catalyst can be increased, and the denitration reactor 23 can be used. The flow velocity of the passing gas can be reduced. Thereby, the pressure loss can be reduced. Further, since a plurality of straightening vanes 27 are arranged on the outlet side surface of the module 4 so as to be parallel to the gas flow direction, the gas flow velocity on the outlet side of the module 4 can be made uniform. .. Thereby, the static pressure on the outlet side of the module 4 can be made uniform. Further, the plurality of rectifying plates 27 are arranged so as not to come into contact with the plurality of modules 4, that is, a gap is formed between the upstream end of each rectifying plate 27 and each module 4. It is possible to prevent the flow velocity of the gas in the module 4 from being locally reduced in the vicinity of the contact point between the plate 27 and the module 4 and inducing an imbalance in the flow velocity. Therefore, since the flow velocity of the gas in the denitration device 21 can be made uniform, the denitration efficiency can be improved.

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

Further, as in the present embodiment, the shape of the vane 28 can be, for example, an arc shape as described above.

In the present embodiment, the straightening vane 27 is arranged so that its end portion protrudes toward the downstream side of the downstream end portion of the module 4. As a result, it is possible to prevent the flow velocity of the gas from becoming maximum at the apex of the module 4.

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

Further, in the present embodiment, the case where the downstream end of the straightening vane 27 protrudes toward the downstream side by 0.083 l from the downstream end of the module 4 has been described as an example, but the present invention is not limited to this. .. Preferably, the downstream end of the straightening vane 27 is set so as to project toward the downstream side in the range of 0.01 l to 0.2 l from the downstream end of the module 4.

Next, the fourth embodiment of the present disclosure will be described with reference to FIG.
The basic configuration of the present embodiment is basically the same as that of the third embodiment, but in the third embodiment, a V-shaped vane 38 is provided instead of the arc-shaped vane 28. The point is different. Therefore, in the present embodiment, this different part will be described, and the description of other overlapping parts will be omitted.
The same components as those in the first embodiment are designated by the same reference numerals, and the duplicated description thereof will be omitted.

FIG. 11 is a cross-sectional view showing a part of the denitration device according to the present embodiment.
As shown in FIG. 11, the denitration reactor 33 provided in the denitration device 31 according to the present embodiment has a V-shaped vane 38 (1) that protrudes toward the upstream side of the gas and narrows its width. (Not shown) is provided.

According to the present embodiment, the following effects are exhibited by the configuration described above.
As in this embodiment, the shape of the vane 38 can be, for example, a V-shape as described above. With the V-shaped vane 38 as described above, the vane 38 can be designed only by arranging a straight plate, so that the design becomes easy.

1,11,21,31 Denitration device 2 Duct 3,13,23,33,103 Denitration reactor 4,14,104 Module 5,15 Resistor 6 Conventional plate-shaped catalyst placement space 27 Rectifier plate 28,38 vanes 41 Pleated inlet surface 42 Pleated outlet surface 43 (of denitration reactor) Inlet surface 110 Frame δ Angle P Arrow

Claims (6)

The duct through which gas flows and
A denitration reactor arranged in the duct and
In the denitration device equipped with
The denitration reactor has a plurality of modules having a catalyst for removing nitrogen oxides in the gas by reacting with the gas flowing into the duct.
The plurality of modules are arranged in a pleated manner.
A plurality of resistors are arranged at equal intervals between the plurality of modules so that the plurality of resistors are parallel to each other in the direction in which the gas flowing into the duct flows .
A denitration device , wherein the resistor is a catalyst sheet having the catalyst, and the module has the catalyst more densely than the resistor. The duct through which gas flows and
A denitration reactor arranged in the duct and
In the denitration device equipped with
The denitration reactor has a plurality of modules having a catalyst for removing nitrogen oxides in the gas by reacting with the gas flowing into the duct.
The plurality of modules are inclined with respect to the direction in which the gas flowing into the duct flows, and are arranged parallel to each other.
A plurality of resistors are arranged at equal intervals between the plurality of modules so that the plurality of resistors are parallel to each other in the direction in which the gas flowing into the duct flows .
A denitration device , wherein the resistor is a catalyst sheet having the catalyst, and the module has the catalyst more densely than the resistor. The denitration device according to claim 1 or 2 , wherein the resistor is not arranged between the plurality of modules. The duct through which gas flows and
A denitration reactor arranged in the duct and
In the denitration device equipped with
The denitration reactor has a plurality of modules having a catalyst for removing nitrogen oxides in the gas by reacting with the gas flowing into the duct.
The plurality of modules are arranged in a pleated manner.
A plurality of straightening vanes are arranged on the outlet side surface of the duct in the plurality of modules so as to be parallel to the flow direction of the gas and not in contact with the plurality of modules. Denitration device. The denitration device according to claim 4 , wherein a vane projecting toward the inlet side of the duct is provided at an end portion of the plurality of modules on the inlet side of the duct. The claim is characterized in that the shape of the vane is an arc shape curved so as to be convex toward the inlet side of the duct or a V shape that protrudes toward the upstream side of the gas and narrows its width. Item 5. The denitration device according to item 5.

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