JP5812900B2 - Fluid mixing device and dry exhaust gas treatment device - Google Patents

Description

  The present invention relates to a fluid mixing device that mixes different fluids, such as exhaust gas and reducing agent of a denitration device, and a dry exhaust gas treatment device including the fluid mixing device.

The exhaust gas discharged from automobiles and boilers contains nitrogen oxides that cause environmental loads such as photochemical smog and acid rain. Therefore, a denitration apparatus is used as means for removing nitrogen oxides in order to prevent nitrogen oxides from being released into the atmosphere.
As a denitration method used in a denitration apparatus, there is an SCR method (dry ammonia selective catalytic reduction method) in which nitrogen oxides in exhaust gas are reacted with ammonia as a reducing agent and decomposed into water and nitrogen by a catalyst.

More specifically, the SCR denitration apparatus includes an ammonia injection section, a mixer (fluid mixing apparatus), and a catalyst that are installed in order from the upstream side in a straight pipe section in a duct through which exhaust gas passes. Therefore, the ammonia injected into the duct passes through the mixer together with the exhaust gas, so that the nitrogen oxide in the exhaust gas is mixed with ammonia and flows into the catalyst.
An ammonia injection grid (AIG) system that injects ammonia gas obtained by vaporizing ammonia water using a vaporizer, or ammonia water that injects ammonia water droplets into the duct and vaporizes in the duct is provided in the ammonia injection section. There is a droplet spray system.

  As a conventional mixer, as disclosed in Patent Documents 1 and 2 below, by installing plates (blades) alternately in the flow direction, a vertical vortex is forcibly generated and diffused by this vertical vortex. Those that enhance the mixing effect are known.

JP 2001-252545 A U.S. Pat. No. 4,830,792

According to the prior art described above, a mixer is used in which vertical vortices are forcibly generated by installing plates (blades) alternately in the flow direction, and the diffusion mixing effect is enhanced by the vertical vortices. However, it has been pointed out that such a mixer has a large pressure loss in order to forcibly generate a longitudinal vortex.
Further, in the conventional mixer, the staggered plates are installed close to each other, so that the vortices generated in each plate interfere with each other, so that the vortex formed is attenuated to reduce the diffusion mixing effect. There is also a problem.

Thus, in a dry exhaust gas treatment device such as a denitration device that requires mixing of exhaust gas and a reducing agent, the pressure loss of the mixing device (mixer) that mixes nitrogen oxides in the exhaust gas and the reducing agent is reduced. There is a demand for the development of a device that reduces the amount of power consumed and has high operating efficiency. In addition, it is desired to provide a device with good operation efficiency by suppressing attenuation due to interference between adjacent vortices of the mixing device and improving the diffusion mixing efficiency of the mixing device.
The present invention has been made to solve the above-described problems, and the object of the present invention is to solve the problems of attenuation due to pressure loss and vortex interference in the mixing device, thereby improving the operation efficiency of the fluid mixing device. And providing a dry exhaust gas treatment apparatus.

In order to solve the above problems, the present invention employs the following means.
The fluid mixing device according to the present invention is a fluid mixing device in which an exhaust gas flowing through a predetermined flow path and a reducing agent injected into the flow path pass through and are mixed, and the exhaust gas and comprising one or more layered mixture elements arranged to intersect the fluid flow direction as the reducing agent passes, quadrature said layered mixture elements, provided on top of an upstream side of said fluid flow direction Two plate-like blades having a substantially trapezoidal shape bent to the downstream side in the fluid flow direction at a gap forming portion of a flat plate and a connecting portion in which the upper bottom side is connected to two opposite sides of the gap forming portion And a plurality of mixing cells forming a substantially truncated pyramid shape by a substantially trapezoidal opening provided adjacent to the plate-like blade portion, and the mixing cell includes the plate-like blade portion and the opening Contact are connected adjacent to each other in a state where part was rotated 90 degrees , The opening is characterized in that it is open when the layered mixture elements viewed from an upstream side of the fluid flow direction.

  According to such a fluid mixing device, the laminar mixture element disposed in the flow path includes a rectangular flat plate gap forming portion provided at the top on the upstream side in the flow direction, and opposite sides of the gap forming portion. A plurality of mixed cells that form a substantially truncated pyramid shape by two plate-shaped blade portions connected to each other and a substantially trapezoidal opening provided adjacent to the plate-shaped blade portion. The mixing cells are connected adjacent to each other with the plate-like blade portion and the opening rotated by 90 degrees, so that the plate-like blade portions are arranged apart from each other by the gap forming portion. And in a state of being inclined with respect to the flow direction. For this reason, the exhaust gas and the reducing agent that pass through the fluid mixing device are efficiently diffused and mixed by the large-scale vertical vortex combined with the vertical vortex (swirl flow) that naturally occurs from the inclined plate-shaped blade portion.

At this time, since the adjacent plate blades are separated from each other by the gap forming portion, it is possible to suppress the vortex generated from each plate blade from interfering and decaying, and therefore, large longitudinal vortices. Can be formed efficiently.
Further, by providing the gap forming portion, the productivity of the mixing cell and the layered mixture element is improved.

  In the fluid mixing device described above, the rectangular side length (S) of the gap forming portion is 1/5 or more (S ≧ 1 /) based on the substantially trapezoidal lower bottom length (D) of the plate-like blade portion. 5D) is preferably set, so that it is possible to reliably suppress the vortices generated from the respective plate-shaped blades from interfering with each other and being attenuated. Note that the upper limit of the rectangular side length (S) of the gap forming portion is as low as 1 in consideration of the vertical vortex formation of each plate-like blade portion and the combination of the vertical vortices naturally generated in each plate-like blade portion. A value close to / 5D is desirable.

  In the fluid mixing apparatus described above, the laminar mixture element is preferably connected to a plurality of mixing units formed by connecting four mixing cells in the vertical and horizontal directions, thereby achieving good diffusion mixing.

Further, in the fluid mixing apparatus described above, the mixing unit includes two plate-like blade portions forming the substantially truncated pyramid shape of the mixing cell of the mixing cell, and the end portions of the substantially trapezoidal lower bottom. It is preferable to leave one disposed so as to be in contact with each other and to remove the other plate-like blade portion to be the opening , thereby suppressing pressure loss while ensuring the performance of diffusion mixing. Is possible. That is, by leaving only the plate-like blade portion that contributes to the formation of a large swirling flow, the longitudinal vortex for diffusive mixing is reliably formed, and the cross-sectional area of the flow path is increased by halving the plate-like blade portion, thereby reducing pressure loss. Suppression becomes possible.

  In such a fluid mixing apparatus, it is preferable that the layered mixture element is connected with a gap between the mixing units, thereby suppressing attenuation due to mutual interference. In this case, since the adjacent vortices are attenuated in the opposite directions, the attenuation is reduced. Therefore, it is desirable to arrange the layered mixture elements so that all the adjacent vortices in the vertical and horizontal directions are in the opposite directions.

  The dry exhaust gas treatment apparatus of the present invention includes a flow path for flowing the exhaust gas to be treated, a reducing agent injection section for injecting a reducing agent into the flow path, and a straight pipe section of the flow path. The fluid mixing apparatus according to any one of claims 1 to 5, wherein the reducing agent is mixed, and a catalyst that is installed inside the flow path and decomposes by allowing the fluid mixed in the fluid mixing apparatus to pass therethrough. It is characterized by comprising.

  According to such a dry exhaust gas treatment device, since the fluid mixing device according to any one of claims 1 to 5 is provided, the exhaust gas and the reducing agent passing through the fluid mixing device are inclined plate blades. The vertical vortices that naturally occur from the parts are diffused and mixed efficiently by the large-scale vertical vortices that are joined together without interfering with each other. As a result, the fluid mixing device can efficiently mix and react the exhaust gas and the reducing agent, and therefore can efficiently decompose the mixed fluid of the exhaust gas and the reducing agent that passes through the catalyst.

  According to the fluid mixing device of the present invention described above, fluids such as exhaust gas and reducing agent in the denitration device can be mixed efficiently with less power consumption by reducing pressure loss. In addition, according to the fluid mixing device of the present invention, attenuation due to interference between adjacent vortices is suppressed, and the diffusion mixing efficiency of the mixing device is improved, resulting in a device with high operating efficiency. Therefore, the dry exhaust gas treatment apparatus provided with this fluid mixing apparatus is an indispensable component mixing apparatus, which solves the problems of attenuation due to pressure loss and vortex interference, and becomes an apparatus with high operating efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows one Embodiment of the fluid mixing apparatus which concerns on this invention, (a) is a perspective view which shows the mixing cell and mixing unit of a layered mixture element, (b) is a back view of the mixing cell and mixing unit of (a). It is the figure seen from the (flow direction downstream) side. It is the figure which looked at the layered mixture element comprised by combining the mixing cell and mixing unit which were shown in FIG. 1 from the front (flow direction upstream) side. It is a perspective view which shows the vertical vortex formed from the edge of a plate-shaped blade | wing part in the back surface of a mixing cell. It is a longitudinal cross-sectional view which shows one Embodiment of the dry type exhaust gas processing apparatus which concerns on this invention. It is the figure seen from the front (flow direction upstream) side which shows the 1st modification of the layered mixture element shown in FIG. FIGS. 3A and 3B are diagrams showing a first modification of the layered mixture element shown in FIG. 2, in which FIG. 2A is a view of the layered mixture element viewed from the front (upstream in the flow direction) side, and FIG. It is the figure which looked at from the back side. In the case where two layers of layered mixture elements are arranged in the flow direction, the ratio (X It is a figure which shows the relationship between density variation (%) and pressure loss (ratio with 1 step | paragraph) about / D). The figure which shows the relationship between density | concentration variation (%) and pressure loss (ratio with 1 step | paragraph) about the aspect ratio (2L / D) of a layered mixture element about the case where a layered mixture element is arrange | positioned 2 steps | paragraphs in a flow direction. It is.

Hereinafter, an embodiment of a fluid mixing device and a dry exhaust gas treatment device according to the present invention will be described with reference to the drawings.
In FIG. 4, an SCR method (dry ammonia selective catalytic reduction method) in which nitrogen oxide in exhaust gas is reacted with ammonia as a reducing agent and decomposed into water and nitrogen by a catalyst is adopted as an embodiment of a dry exhaust gas treatment apparatus. A denitration apparatus 1 is shown.

The illustrated denitration apparatus 1 is installed in a duct (flow path) 2 for flowing exhaust gas to be treated, a reducing agent injection section 3 for injecting ammonia (reducing agent) into the duct 2, and a straight pipe section of the duct 2. And a fluid mixing device 10 that mixes exhaust gas and ammonia, and a catalyst 4 that is installed inside the duct 2 and passes through the fluid mixed by the fluid mixing device 10 and decomposes.
In this case, the reducing agent injection unit 3 is an ammonia injection grid (AIG) system in which ammonia gas obtained by vaporizing ammonia water by a vaporizer is injected, or a droplet of ammonia water is injected into the duct 2 to form the duct 2. Any of the ammonia water droplet spraying methods may be used for vaporizing inside.

The fluid mixing device 10 passes through the exhaust gas flowing inside the duct 2 forming a predetermined flow path and ammonia of the reducing agent injected into the duct 2, and mixes both the exhaust gas and ammonia which are both gases. Device. In this fluid mixing apparatus 10, for example, as shown in FIGS. 1 to 3, a layered mixture element 11 configured by combining a plurality of mixing cells 20 is installed in a duct 2.
The layered mixture element 11 is a member having a thin layer shape (plate shape) as a whole, and intersects with the fluid flow direction of the exhaust gas so that the exhaust gas and ammonia gas flow and preferably flows with the fluid flow direction of the exhaust gas. One sheet (stage) or a plurality of sheets (stages) are installed so as to be orthogonal to each other.

  And the mixing cell 20 which comprises the layered mixture element 11 has the substantially trapezoid shape connected with the gap | interval formation part 21 of the rectangular flat plate provided in the top part of the flow direction upstream, and the edge which the gap | interval formation part 21 opposes. The two plate-shaped blade portions 22 and the substantially trapezoidal opening 23 provided adjacent to the plate-shaped blade portion 22 form a substantially truncated pyramid shape. The mixing cell 20 configured as above forms a layered mixture element 11 by combining a plurality thereof, and in this case, the plurality of mixing cells 20 rotate the plate-like blade portion 22 and the opening 23 by 90 degrees. In a state, they are connected adjacent to each other. That is, the end portions of the sides that are the lower bottom of the plate-like blade portion 22 are connected to the mixing cell 20 adjacent to the upper, lower, left, and right sides so that the lower bottom portions of the plate-like blade portion 22 and the opening 23 are in contact with each other.

For example, as shown in FIG. 1, the layered mixture element 11 forms a mixing unit 30 formed by connecting four mixing cells 20 vertically and horizontally, and it is desirable to connect a plurality of the mixing units 30. For this reason, the layered mixture element 11 shown in FIG. 2 has a configuration in which six mixing cells 20 in the vertical direction and ten mixing cells 20 in the horizontal direction are connected, that is, a total of 15 (3 vertical columns / 5 horizontal columns). Although it is set as the structure which connected the unit 30, it is not limited to this number. In this case, the mixing unit 30 of the layered mixture element 11 is connected to the upper, lower, left and right sides without any gaps.
Each of the plate-like blade portions 22 and the openings 23 has a substantially trapezoidal shape with an upper base length S and a lower base length D, and a pair of plate-like blade portions 22 and openings 23 facing each other. A substantially pyramidal frustum shape having the gap forming portion 21 as an upper surface and the opening surface as a virtual bottom surface is formed by the gap forming portion 21 having a rectangular length of S and an opening surface having a rectangular length of one side. Has been.

  In the production of the mixed cell 20 described above, a trapezoidal plate shape having an upper base length S and a lower base length D on two opposite sides with respect to the gap forming portion 21 having a square length of one side S. A plate material obtained by connecting the blade portions 22 is prepared. After that, if the plate-like blade portion 22 is bent so as to be inclined with respect to the flow direction at the position where the gap forming portion 21 and the upper bottom of the plate-like blade portion 22 are connected, the substantially truncated pyramid shape described above is obtained. The mixed cell 20 becomes. And the some mixing cell 20 becomes the sheet | seat layered element 11 by connecting suitably the edge | side used as the lower bottom of the plate-shaped blade | wing part 22 with the adjacent edge part.

  In the layered mixture element 11 of the fluid mixing apparatus 10 configured as described above, the plate-like blade portions 22 are arranged so as to be separated from each other by the gap forming portion 21 and are inclined with respect to the flow direction of the exhaust gas. Is in a state (arranged at an angle). That is, the plate-like blade portion 22 that forms a vertical vortex in the flow of exhaust gas and ammonia gas is separated by a rectangular gap forming portion 21 having a length of one side of S as a front top portion on the upstream side in the flow direction. It is in a state that has been made. That is, since the gap forming portion 21 shown in the figure is a square with one side having a length S, the clearance between the adjacent plate-like blade portions 22 on the upstream side is the rectangular side length S of the gap forming portion 21. Is provided.

  The flow of the exhaust gas and ammonia gas passing through the fluid mixing device 10 is, for example, as shown by arrows in FIGS. 1B and 3, each mixing cell 20 in which the flow passing through the opening 23 is on the downstream side in the flow direction. Is a vertical vortex (swirl flow) f naturally generated from the inclined plate-like blade portion 22. This vertical vortex f is coupled to each of the four mixing cells 20 in which the end portions of the lower bottom side are connected, and becomes a large-scale synthetic vertical vortex (swirl flow) F indicated by an arrow in the drawing. When such a synthetic longitudinal vortex F is formed, the exhaust gas and the ammonia gas are efficiently diffused and mixed by the plate-like blade portion 22 functioning as a so-called delta blade.

At this time, since the adjacent plate-like blade portions 22 are separated from each other by the side length S of the gap forming portion 21, it is possible to suppress the longitudinal vortex f generated from each plate-like blade 22 from interfering and decaying. . For this reason, the layered mixture element 11 of the liquid mixing apparatus 10 can efficiently form a large-scale synthetic longitudinal vortex F. The provision of the gap forming portion 21 is also effective for improving the productivity of the mixing cell 20 and the layered mixture element 11.
In particular, the layered mixture element 11 forms a mixing unit 30 formed by connecting four mixing cells 20 in the vertical and horizontal directions. Therefore, the composite vertical vortex F can be efficiently formed in each mixing unit 30 to achieve good diffusion. Mixing can be performed.

By the way, in the fluid mixing apparatus 10 described above, the side length S of the gap forming portion 21 having a rectangular shape is 1/5 or more based on the lower base length D of the plate-like blade portion 22 having a substantially trapezoidal shape ( S ≧ 1 / 5D) is desirable. This side length S surely suppresses the attenuation suppressing effect of the gap forming portion 21, that is, reliably suppresses the longitudinal vortex f generated from each plate-like blade 22 from being attenuated by mutual interference. It is a value that has been confirmed by demonstration machines and experiments.
Therefore, if the side length S of the gap forming portion 21 is too short than 1 / 5D, sufficient interference suppression cannot be performed. However, with respect to the upper limit of the side length S, the formation of the vertical vortex f that naturally occurs in each plate-like blade portion 22 and the formation of the combined vertical vortex F by the combination of the vertical vortices f that naturally occur in each plate-like blade portion 22. In view of the above, it is not preferable that the ratio of the plate-like blade portion 22 in the mixing cell 20 is small, so it is desirable to set the value as close to 1 / 5D as possible.

Next, a first modification of the layered mixture element 11 shown in FIG. 2 will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the part similar to embodiment mentioned above, and the detailed description is abbreviate | omitted.
In the layered mixture element 11A of the first modified example, a mixing unit 30 formed by connecting four mixing cells 20 vertically and horizontally is connected with a gap 40 between adjacent units. In the illustrated configuration example, a total of eight mixing units 30 are provided with two rows arranged vertically and four rows arranged horizontally. Between the mixing units 30 adjacent in the vertical and horizontal directions, gaps 40 in the vertical and horizontal directions are provided. This gap 40 is an area where the mixing cell 20 does not exist at all.

  In the layered mixture element 11A according to the first modified example, the gap portion 40 is provided between the adjacent mixing units 30. Therefore, the vertical vortex naturally generated from the plate-like blade portion 22 by the four mixing cells 20 is provided. f is combined for each unit to form a large-scale synthetic longitudinal vortex F. In this case, if the direction of the adjacent mixing unit 30 is arranged in the reverse direction, that is, if the direction of the plate-like blade portion 22 and the opening 23 in the adjacent mixing unit 30 is the reverse direction, the adjacent mixing unit 30 A synthetic longitudinal vortex F in the opposite direction is formed every 30 and attenuation due to mutual interference is reduced. For this reason, in the layered mixture element 11 </ b> A provided with the gap 40, it is desirable that the mixing unit 30 be arranged so that all adjacent vortices are in the opposite direction.

Next, a second modification of the layered mixture element 11 shown in FIG. 2 will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the part similar to embodiment mentioned above, and the detailed description is abbreviate | omitted.
The layered mixture element 11B of the second modification employs a mixed cell 20A having a different shape. This mixing cell 20A is obtained by removing one plate-like blade portion 22 from the mixing cell 20 of the above-described embodiment, and is connected to a rectangular flat plate gap forming portion 21 and one side of the gap forming portion 21. This is a member that forms a substantially truncated pyramid shape by one plate-like blade portion 22 having a substantially trapezoidal shape and three substantially trapezoidal opening portions 23 provided adjacent to the plate-like blade portion 22.

  More specifically, since one mixed cell 20A is provided with one plate-like blade portion 22 arranged so that the ends of the substantially trapezoidal lower bottom are in contact with each other, this plate-like blade portion By connecting four bottom end portions of 22, a mixing unit 30 </ b> A of the second modification is configured. In the illustrated configuration example, the gap 40 is provided between the units so that the combined vertical vortex 40 is in the same direction. However, as in the embodiment shown in FIG. Also good.

  In such a 2nd modification, the large synthetic | combination vertical vortex F which performs diffusive mixing can be reliably formed by leaving the plate-shaped blade | wing part 22 inside a unit which contributes to formation of a big swirl flow. In other words, in the mixing unit 30A, the number of the plate-like blade portions 22 provided in the unit is left at a position where the four plate-like blade portions 22 are connected, and only those effective for the formation of the composite vertical vortex F are left. Since it is halved, not only can a large-scale synthetic longitudinal vortex F be reliably formed, but the cross-sectional area of the flow path is increased by the amount of decrease in the plate-like blade portion 22, so that pressure loss can be suppressed.

According to the fluid mixing apparatus 10 of the above-described embodiment, the pressure loss is reduced as compared with that forcibly generating longitudinal vortices, so that the exhaust gas and the reducing agent can be efficiently mixed with less power consumption.
Moreover, according to the fluid mixing apparatus 10 described above, attenuation due to interference between adjacent vortices can be suppressed and diffusion mixing efficiency can be improved, so that the apparatus has high operating efficiency. Therefore, the dry exhaust gas treatment apparatus such as the denitration apparatus 1 provided with the fluid mixing apparatus 10 is free from problems of attenuation due to pressure loss and vortex interference in the fluid mixing apparatus 10 which is an essential component. It becomes a good device.

  By the way, when the layered mixture element 11 described above is arranged in two stages in the flow direction, as shown in FIG. 7, the interval (distance X) between the layered mixture elements 11 and the plate-like blade portion 22 constituting the mixing cell 20. The ratio (X / D) to the substantially trapezoidal lower base length D is 3 or more (X / D ≧ 3). This is because when the lower base length D is kept constant and the distance X is increased, the concentration variation decreases, but the pressure loss increases. Therefore, the variation in the concentration variation and the pressure loss are relatively small with respect to the variation in the distance X. A region with a gentle slope is set as the optimum value of the ratio (X / D).

When the layered mixture element 11 is arranged in two stages in the flow direction, as shown in FIG. 8, the optimum aspect ratio (2L / D) of the layered mixture element 11 is about 0.8. This is because the pressure loss decreases as the aspect ratio increases, so that the minimum value of density variation is set to the optimum value. In addition, L of the molecule for calculating the aspect ratio is the width in the flow direction of the mixed cell 20 (the height of the substantially truncated pyramid shape).
In addition, this invention is not limited to embodiment mentioned above, In the range which does not deviate from the summary, it can change suitably.

1 Denitration equipment (dry exhaust gas treatment equipment)
2 Duct (flow path)
DESCRIPTION OF SYMBOLS 3 Reducing agent injection | pouring part 4 Catalyst 10 Fluid mixing apparatus 11, 11A, 11B Layered mixture element 20, 20A Mixing cell 21 Gap formation part 22 Plate-shaped blade part 23 Opening part 30, 30A Mixing unit 40 Gap part f Longitudinal vortex (swirl) Flow)
F Synthetic longitudinal vortex (swirl flow)

Claims (6)

A fluid mixing device in which an exhaust gas flowing through a predetermined flow path and a reducing agent injected into the flow path are passed through and mixed,
Comprising one or a plurality of layered mixture elements arranged to intersect the fluid flow direction so that the exhaust gas and the reducing agent pass through the flow path;
The laminar mixture element includes a gap between a rectangular flat plate provided at the top on the upstream side in the fluid flow direction and a connecting portion in which an upper bottom side is connected to two opposite sides of the gap forming portion. A substantially truncated pyramid shape is formed by two plate-like blade portions having a substantially trapezoidal shape bent toward the downstream side in the direction and a substantially trapezoidal opening provided adjacent to the plate-like blade portion. With multiple mixing cells,
The mixing cells are connected adjacent to each other with the plate-like blade portion and the opening rotated by 90 degrees ,
The fluid mixing apparatus , wherein the opening is opened when the layered mixture element is viewed from the upstream side in the fluid flow direction .   The rectangular side length (S) of the gap forming portion is set to 1/5 or more (S ≧ 1 / 5D) based on the substantially trapezoidal lower bottom length (D) of the plate-like blade portion. The fluid mixing apparatus according to claim 1.   3. The fluid mixing apparatus according to claim 1, wherein the layered mixture element is connected to a plurality of mixing units formed by connecting four mixing cells vertically and horizontally. The mixing unit leaves one of the two plate-like blade portions forming the substantially truncated pyramid shape of the mixing cell disposed so that the ends of the substantially trapezoidal lower bottom are in contact with each other , and the other The fluid mixing device according to claim 3, wherein the plate-like blade portion is removed to form the opening . The fluid mixing device according to claim 3 or 4 , wherein the layered mixture element is connected with a gap provided between the mixing units.   2. A flow path for flowing exhaust gas to be treated, a reducing agent injection section for injecting a reducing agent into the flow path, and a straight pipe section of the flow path to mix the exhaust gas and the reducing agent. To the fluid mixing device according to any one of 1 to 5, and a catalyst that is installed inside the flow path and decomposes through the fluid mixed in the fluid mixing device. A dry exhaust gas treatment device.

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