CN211987943U - Ammonia spraying device applied to activated carbon desulfurization and denitrification adsorption tower - Google Patents
Ammonia spraying device applied to activated carbon desulfurization and denitrification adsorption tower Download PDFInfo
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- CN211987943U CN211987943U CN202020084560.0U CN202020084560U CN211987943U CN 211987943 U CN211987943 U CN 211987943U CN 202020084560 U CN202020084560 U CN 202020084560U CN 211987943 U CN211987943 U CN 211987943U
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Abstract
The utility model belongs to the technical field of the flue gas is handled, concretely relates to application is in ammonia device that spouts of active carbon desulfurization denitration adsorption tower, should spout the setting of ammonia device in active carbon desulfurization denitration adsorption tower, has cancelled original ammonia smoke box and baffle when guaranteeing the denitration effect, makes the adsorption tower width reduce, saves steel and manufacturing period. The ammonia spraying device comprises an ammonia spraying pipe, wherein a nozzle with an upward spraying opening is arranged on the ammonia spraying pipe, so that the influence on the ascending flow direction of flue gas below is avoided, the flue gas is uniformly distributed, and the energy consumption of the system is reduced. The ammonia spraying pipe is arranged between two adjacent cloth funnel assemblies, is positioned below the horizontal plane where the upper edge of each cloth funnel assembly is positioned, and is positioned above the horizontal plane where the discharge port of each cloth funnel assembly is positioned, so that the ammonia spraying pipe is not in contact with the activated carbon, the abrasion of the ammonia spraying pipe and the nozzle when the activated carbon flows is avoided, and the probability of nozzle blockage is greatly reduced.
Description
Technical Field
The utility model belongs to the technical field of the flue gas is handled, concretely relates to ammonia injection device of application in active carbon SOx/NOx control adsorption tower. The method is applied to flue gas treatment in the industries of ferrous metallurgy and the like, and is particularly applied to a dry desulfurization and denitrification system.
Background
The mode of current dry process adsorption tower denitration sets up the ammonia spraying smoke box in adsorption tower one side, be the structural schematic diagram of ammonia spraying smoke box setting on the adsorption tower among the prior art as figure 1, two denitration beds that correspond at double-deck processing system's adsorption tower respectively are provided with the ammonia spraying smoke box, set up ammonia spraying pipeline and nozzle in the ammonia spraying smoke box, in addition still need set up the guide plate inside the adsorption tower, with flue gas water conservancy diversion to the ammonia spraying smoke box in, make ammonia and flue gas mix in the ammonia spraying smoke box, the contact, the reaction, and then realize desorption nitrogen oxide's purpose.
The structure of the adsorption tower is more complicated due to the arrangement mode, the consumption of steel is larger due to the arrangement of the ammonia spraying smoke box, the platform at the position of the ammonia spraying smoke box is also large due to the fact that the ammonia spraying smoke box occupies a larger space, and the overall manufacturing period of the adsorption tower is also longer.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
An object of the utility model is to provide an ammonia device is spouted in active carbon SOx/NOx control adsorption tower to solve at least and spout ammonia smoke box at present and bulky and increase the steel use amount, and increased the overall dimension of adsorption tower, prolonged the problem of manufacturing period.
In order to achieve the above object, the present invention provides the following technical solutions:
an ammonia spraying device applied to an activated carbon desulfurization and denitrification adsorption tower comprises a distribution funnel layer, wherein the distribution funnel layer comprises a plurality of distribution funnel assemblies, the edges of two adjacent distribution funnel assemblies are connected to form a material separation sub-layer of the distribution funnel layer, and the side wall of each distribution funnel assembly is provided with an air inlet; the ammonia spraying device is arranged in the activated carbon desulfurization and denitrification adsorption tower and comprises an ammonia spraying pipe, a nozzle is arranged on the ammonia spraying pipe, and the ammonia spraying pipe is arranged between every two adjacent cloth funnel assemblies.
In the ammonia injection device applied to the activated carbon desulfurization and denitrification adsorption tower, the injection port of the nozzle is upward preferably; the ammonia spraying pipe is positioned below the horizontal plane where the upper edge of the distribution funnel assembly is positioned and above the horizontal plane where the discharge hole of the distribution funnel assembly is positioned; and the ammonia spraying pipe is also arranged between the distribution funnel component and the side wall of the activated carbon desulfurization and denitrification adsorption tower.
In the ammonia injection device used in the activated carbon desulfurization and denitrification adsorption tower as described above, preferably, a plurality of the ammonia injection pipes are arranged in parallel.
In the above ammonia injection device for use in the activated carbon desulfurization and denitrification adsorption tower, preferably, the plurality of nozzles are provided and are uniformly distributed along the longitudinal direction of the ammonia injection pipe.
In the ammonia injection device applied to the activated carbon desulfurization and denitrification adsorption tower, the ammonia injection pipe is preferably a square pipe, and two surfaces of the ammonia injection pipe are horizontally placed.
In the above ammonia injection device for an activated carbon desulfurization and denitrification adsorption tower, preferably, the nozzle is cylindrical, the upper surface of the ammonia injection pipe is provided with a mounting hole, and the lower end of the nozzle is correspondingly connected with the mounting hole, so that the nozzle is communicated with the ammonia injection pipe.
In the ammonia spraying device applied to the activated carbon desulfurization and denitrification adsorption tower, as a preferred scheme, two ends of the ammonia spraying pipe penetrate through the side wall of the activated carbon desulfurization and denitrification adsorption tower and extend out of the activated carbon desulfurization and denitrification adsorption tower, and two ends of the ammonia spraying pipe are provided with ammonia inlets; and connecting flanges are arranged at the ammonia gas inlets at the two ends of the ammonia spraying pipe.
In the ammonia injection device applied to the activated carbon desulfurization and denitrification adsorption tower, preferably, the ammonia injection pipe is provided with a reinforcing structure, and the reinforcing structure is distributed along the length direction of the ammonia injection pipe so as to enhance the bending strength of the ammonia injection pipe.
In the above ammonia injection device for the activated carbon desulfurization and denitrification adsorption tower, preferably, the reinforcing structure is a reinforcing rib plate, the reinforcing rib plate is vertically arranged, and an upper edge of the reinforcing rib plate is connected with a lower surface of the ammonia injection pipe.
In the ammonia injection device applied to the activated carbon desulfurization and denitrification adsorption tower, preferably, a distance between the injection port of the nozzle and the upper edge of the distribution hopper assembly is smaller than a distance between the injection port and the discharge port of the distribution hopper assembly.
Compared with the closest prior art, the utility model provides a technical scheme has following beneficial effect:
the utility model provides an application is in ammonia device that spouts of active carbon SOx/NOx control adsorption tower adopts and spouts the ammonia pipe and arrange side by side between adjacent cloth funnel subassembly, both can make ammonia and flue gas obtain the intensive mixing, guarantees the denitration effect, has cancelled original ammonia spraying smoke box and baffle again, makes the platform width that spouts ammonia spraying smoke box position reduce, and the whole height of adsorption tower reduces, saves steel and manufacturing period. And the ammonia spraying pipe is arranged between the adjacent distributing hopper assemblies and is not contacted with the activated carbon, so that the abrasion of the ammonia spraying pipe and the nozzle when the activated carbon flows is avoided, and the probability of nozzle blockage is greatly reduced. The injection port of the nozzle is arranged upwards, so that the influence on the flow direction of the smoke rising below is avoided, the smoke is uniformly distributed, the resistance is small, and the energy consumption of the whole system is reduced.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. Wherein:
FIG. 1 is a schematic structural diagram of an ammonia injection smoke box arranged on an adsorption tower in the prior art;
FIG. 2 is a top view of an ammonia sparger according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of an ammonia injection pipe according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of an activated carbon desulfurization and denitrification adsorption tower according to an embodiment of the present invention;
FIG. 5 is an enlarged view of a portion A of FIG. 4;
fig. 6 is a schematic view of the flow direction of ammonia gas and flue gas in the embodiment of the present invention.
In the figure: 1. an ammonia spraying smoke box; 2. a baffle; 3. a distribution funnel layer; 4. a bottom desulfurization bed layer; 5. an ammonia spraying pipe; 6. a nozzle; 7. a connecting flange; 8. a reinforcing rib plate; 9. a first bottom denitration bed layer; 10. a bottom middle activated carbon layer; 11. an upper middle activated carbon layer; 12. an upper desulfurization bed layer; 13. a first upper denitration bed layer; 14. a top activated carbon layer; 15. an active carbon inlet; 16. an activated carbon outlet; 17. a flue gas inlet; 18. a flue gas outlet; 19. a bottom denitration bed layer II; 20. and a second upper denitration bed layer.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense, and may be, for example, either fixed or detachable; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
As shown in fig. 1, for the structural schematic diagram of the ammonia spraying smoke box 1 arranged on the adsorption tower in the prior art, it can be known in the diagram that the ammonia spraying smoke box 1 is arranged on one side of the adsorption tower, an ammonia spraying pipe 5 and a nozzle 6 are arranged in the ammonia spraying smoke box 1, in addition, a guide plate 2 is also required to be arranged inside the adsorption tower, and the flue gas is guided into the ammonia spraying smoke box 1, so that the ammonia and the flue gas are mixed, contacted and reacted in the ammonia spraying smoke box 1, and the purpose of removing nitrogen oxides is further realized. In fig. 1, solid arrows indicate the flow of ammonia gas, and open arrows indicate the flow of flue gas.
According to the embodiment of the present invention, as shown in fig. 2 to 6, the present invention provides an ammonia spraying device for an activated carbon desulfurization and denitrification absorption tower, the activated carbon desulfurization and denitrification absorption tower (hereinafter referred to as absorption tower) comprises a material distribution funnel layer 3, the material distribution funnel layer 3 comprises at least two material distribution funnel components, the edges of two adjacent material distribution funnel components are connected to form a material separation layer of the material distribution funnel layer 3, the material enters the lower part of the material separation layer through the inside of the material distribution funnel, the material distribution funnel component comprises a plurality of funnels, for example, two funnels, the two funnels are overlapped up and down, and a gap is formed between the adjacent side walls, that is, one funnel is arranged in the other funnel, the one funnel is arranged above the other funnel, the funnel above is an upper funnel, the funnel below is a lower funnel, the gap between the two funnels forms an air inlet of the material distribution funnel component, the edges of two adjacent upper funnels are connected to form the material separation sub-layer, in other embodiments, the number of the funnels is one, the side wall of each funnel is provided with an air inlet, and the edges of two adjacent funnels are connected to form the material separation sub-layer. The ammonia spraying device is arranged in the activated carbon desulfurization and denitrification adsorption tower, the ammonia spraying device comprises an ammonia spraying pipe 5, a nozzle 6 is arranged on the ammonia spraying pipe 5, a jet orifice of the nozzle 6 faces upwards, the two ends of the ammonia spraying pipe 5 penetrate through the side wall of the activated carbon desulfurization and denitrification adsorption tower and extend out of the activated carbon desulfurization and denitrification adsorption tower, and ammonia inlets are formed in the two ends of the ammonia spraying pipe 5. The ammonia inlets are arranged at the two ends of the ammonia spraying pipe 5, so that sufficient air inflow can be maintained when the requirement on the air inflow is high, and the air inflow is more uniform. Of course, in the utility model discloses an in other embodiments, the one end that can set up the ammonia injection pipe 5 is sealed, and the other end passes the lateral wall of active carbon SOx/NOx control adsorption tower and stretches out the active carbon SOx/NOx control adsorption tower, and the other end of ammonia injection pipe 5 is provided with the ammonia entry. The ammonia spraying pipe 5 is arranged between two adjacent distributing funnel assemblies, is positioned below the horizontal plane where the upper edge of each distributing funnel assembly is positioned, and is positioned above the horizontal plane where the discharge port of each distributing funnel assembly is positioned. In fig. 5, the solid arrows indicate the flow of ammonia gas, and the hollow arrows indicate the flow of flue gas.
When using, the ammonia gets into through the ammonia entry and spouts ammonia pipe 5, and spout through nozzle 6, 6 spun ammonia of nozzle gets into cloth funnel subassembly in the air inlet of cloth gas leak source lateral wall, evenly distributed and rise in its inside active carbon clearance, with the flue gas intensive mixing that the air inlet through cloth funnel subassembly got into, whole ammonia process ammonia dispersion of spouting is more even, and it is very short to spout the ammonia device and stretch out the adsorption tower distance, reduce the overall dimension of adsorption tower greatly, the use amount of steel has been reduced, the manufacturing period is shortened. And the ammonia spraying pipe 5 is arranged between the adjacent distributing funnel assemblies and is not contacted with the activated carbon, so that the abrasion of the ammonia spraying pipe 5 and the nozzle 6 when the activated carbon flows is avoided, and the probability of blockage of the nozzle 6 is greatly reduced. The jet orifice of the nozzle 6 is arranged upwards, so that the influence on the flow direction of the smoke rising below is avoided, the smoke is uniformly distributed, the resistance is small, and the energy consumption of the whole system is reduced.
Further, spout ammonia pipe 5 and be provided with a plurality ofly, a plurality of 5 parallel arrangements of spout ammonia pipes, evenly distributed is between two adjacent cloth funnel subassemblies and between cloth funnel subassembly and the lateral wall of active carbon SOx/NOx control adsorption tower. The plurality of nozzles 6 are arranged, and the plurality of nozzles 6 are uniformly distributed along the length direction of the ammonia spraying pipe 5. When the ammonia spraying device is used, ammonia gas is uniformly sprayed into the adsorption tower through the plurality of nozzles 6, so that the ammonia spraying is more uniform.
Further, the ammonia injection pipe 5 is a square pipe, and two surfaces of the ammonia injection pipe 5 are horizontally arranged. The nozzle 6 is cylindrical, the upper surface of the ammonia spraying pipe 5 is provided with a mounting hole, the lower end of the nozzle 6 is correspondingly connected with the mounting hole, for example, welded, the nozzle 6 is hermetically connected with the mounting hole, and the communication between the nozzle 6 and the ammonia spraying pipe 5 is realized. The square pipe is used as the ammonia spraying pipe 5, so that the installation hole is convenient to process, the lower end of the nozzle 6 can be also set to be a plane, and the connection is simpler. When the ammonia spraying pipe 5 is a circular pipe, the shape of the joint of the cylindrical nozzle 6 and the ammonia spraying pipe 5 of the circular pipe is a curve when the two pipes are vertically connected, and the processing difficulty is high.
In order to facilitate the connection of the ammonia spraying device and the ammonia gas source, connecting flanges 7 are arranged at the ammonia gas inlets at the two ends of the ammonia spraying pipe 5. The ammonia source is provided with a power transmission device, a pipeline of the ammonia source is connected with a connecting flange 7 of the ammonia spraying device, and ammonia is sprayed into the adsorption tower through the ammonia spraying device.
Further, be provided with additional strengthening on the ammonia injection pipe 5, additional strengthening distributes along the length direction of ammonia injection pipe 5 to the reinforcing spout ammonia 5's bending strength, avoid spouting ammonia 5 atress bending. Because the whole width of adsorption tower is bigger, set up additional strengthening on spouting ammonia pipe 5 and make the anti bending strength who spouts ammonia pipe 5 strengthen greatly to avoid spouting ammonia pipe 5 atress bending. Further, the reinforcing structure is a reinforcing rib plate 8, the reinforcing rib plate 8 is vertically arranged, and the upper edge of the reinforcing rib plate 8 is connected with the lower surface of the ammonia spraying pipe 5.
In order to make the ammonia gas sprayed from the nozzle 6 enter the distribution funnel assembly as soon as possible, the distance between the spraying opening of the nozzle 6 and the upper edge of the distribution funnel assembly is smaller than the distance between the spraying opening and the discharge opening of the distribution funnel assembly.
As shown in fig. 4 the utility model provides an active carbon SOx/NOx control adsorption tower structure sketch map, this adsorption tower include bottom desulfurization bed 4, bottom denitration bed 9, bottom denitration bed two 19, activated carbon layer 10 in the middle of the bottom, activated carbon layer 11 in the middle of upper portion, upper portion desulfurization bed 12, upper portion denitration bed 13, upper portion denitration bed two 20 and top activated carbon layer 14, set up active carbon import 15, active carbon export 16, flue gas import 17 and exhanst gas outlet 18 on the adsorption tower respectively. The utility model discloses an ammonia spraying device sets up in bottom denitration bed and upper portion denitration bed. The arrows in figure 4 indicate the direction of the flue gas flow.
The utility model discloses an ammonia device is spouted in activated carbon SOx/NOx control adsorption tower to application when using, the ammonia gets into through the ammonia entry and spouts ammonia pipe 5, and spout through nozzle 6, 6 spun ammonia of nozzle gets into in the cloth funnel subassembly through the air inlet of cloth gas leak lateral wall, evenly distributed and rise in its inside active carbon clearance, with the flue gas intensive mixing that the air inlet through the cloth funnel subassembly got into, whole ammonia process ammonia dispersion that spouts is more even, and it stretches out the adsorption tower distance very short to spout the ammonia device, reduce the overall dimension of adsorption tower greatly, the use amount of steel has been reduced, the manufacturing period is shortened. And the ammonia spraying pipe 5 is arranged between the adjacent distributing funnel assemblies and is not contacted with the activated carbon, so that the abrasion of the ammonia spraying pipe 5 and the nozzle 6 when the activated carbon flows is avoided, and the probability of blockage of the nozzle 6 is greatly reduced. The jet orifice of the nozzle 6 is arranged upwards, so that the influence on the flow direction of the smoke rising below is avoided, the smoke is uniformly distributed, the resistance is small, and the energy consumption of the whole system is reduced. The arrangement of the reinforcing rib plate 8 reduces the requirement on the strength of the ammonia spraying pipe 5, so that the wall thickness of the ammonia spraying pipe 5 is as thin as possible, and the cost investment of the ammonia spraying pipe 5 is reduced.
To sum up, the utility model provides an application is in the ammonia device that spouts of active carbon SOx/NOx control adsorption tower adopts and spouts ammonia pipe 5 and arrange side by side between adjacent cloth funnel subassembly, both can make ammonia and flue gas obtain the intensive mixing, guarantees the denitration effect, has cancelled original ammonia spraying smoke box 1 and baffle again, makes the platform width who spouts ammonia smoke box 1 position reduce, and the adsorption tower whole height reduces, saves steel and manufacturing period. And the ammonia spraying pipe 5 is arranged between the adjacent distributing funnel assemblies and is not contacted with the activated carbon, so that the abrasion of the ammonia spraying pipe 5 and the nozzle 6 when the activated carbon flows is avoided, and the probability of blockage of the nozzle 6 is greatly reduced. The jet orifice of the nozzle 6 is arranged upwards, so that the influence on the flow direction of the smoke rising below is avoided, the smoke is uniformly distributed, the resistance is small, and the energy consumption of the whole system is reduced.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The ammonia spraying device applied to the activated carbon desulfurization and denitrification adsorption tower is characterized in that the activated carbon desulfurization and denitrification adsorption tower comprises a distribution funnel layer, the distribution funnel layer comprises a plurality of distribution funnel assemblies, the edges of two adjacent distribution funnel assemblies are connected to form a material separation layer of the distribution funnel layer, and the side wall of each distribution funnel assembly is provided with an air inlet;
the ammonia spraying device is arranged in the activated carbon desulfurization and denitrification adsorption tower and comprises an ammonia spraying pipe, a nozzle is arranged on the ammonia spraying pipe, and the ammonia spraying pipe is arranged between every two adjacent cloth funnel assemblies.
2. The ammonia spraying device applied to the activated carbon desulfurization and denitrification adsorption tower according to claim 1, wherein the spraying opening of the nozzle faces upwards;
the ammonia spraying pipe is positioned below the horizontal plane where the upper edge of the distribution funnel assembly is positioned and above the horizontal plane where the discharge hole of the distribution funnel assembly is positioned;
and the ammonia spraying pipe is also arranged between the distribution funnel component and the side wall of the activated carbon desulfurization and denitrification adsorption tower.
3. The ammonia injection device applied to the activated carbon desulfurization and denitrification adsorption tower according to claim 1 or 2, wherein a plurality of ammonia injection pipes are arranged in parallel.
4. The ammonia spraying device applied to the activated carbon desulfurization and denitrification adsorption tower as recited in claim 1, wherein a plurality of nozzles are provided, and the plurality of nozzles are uniformly distributed along the length direction of the ammonia spraying pipe.
5. The ammonia injection device applied to the activated carbon desulfurization and denitrification adsorption tower according to claim 1 or 2, wherein the ammonia injection pipe is a square pipe, and two surfaces of the ammonia injection pipe are horizontally placed.
6. The ammonia spraying device applied to the activated carbon desulfurization and denitrification adsorption tower as recited in claim 5, wherein the nozzle is cylindrical, the upper surface of the ammonia spraying pipe is provided with a mounting hole, and the lower end of the nozzle is correspondingly connected with the mounting hole, so that the nozzle is communicated with the ammonia spraying pipe.
7. The ammonia spraying device applied to the activated carbon desulfurization and denitrification adsorption tower according to claim 1 or 2, wherein two ends of the ammonia spraying pipe penetrate through the side wall of the activated carbon desulfurization and denitrification adsorption tower and extend out of the activated carbon desulfurization and denitrification adsorption tower, and ammonia inlets are formed in two ends of the ammonia spraying pipe; and connecting flanges are arranged at the ammonia gas inlets at the two ends of the ammonia spraying pipe.
8. The ammonia injection device applied to the activated carbon desulfurization and denitrification adsorption tower as recited in claim 1 or 2, wherein the ammonia injection pipe is provided with a reinforcing structure, and the reinforcing structure is distributed along the length direction of the ammonia injection pipe so as to enhance the bending strength of the ammonia injection pipe.
9. The ammonia injection device applied to the activated carbon desulfurization and denitrification adsorption tower as recited in claim 8, wherein the reinforcing structure is a reinforcing rib plate, the reinforcing rib plate is vertically arranged, and the upper edge of the reinforcing rib plate is connected with the lower surface of the ammonia injection pipe.
10. The ammonia spraying device applied to the activated carbon desulfurization and denitrification adsorption tower according to claim 1 or 2, wherein the distance between the spraying opening of the nozzle and the upper edge of the distribution funnel assembly is smaller than the distance between the spraying opening and the discharge opening of the distribution funnel assembly.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020084560.0U CN211987943U (en) | 2020-01-15 | 2020-01-15 | Ammonia spraying device applied to activated carbon desulfurization and denitrification adsorption tower |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020084560.0U CN211987943U (en) | 2020-01-15 | 2020-01-15 | Ammonia spraying device applied to activated carbon desulfurization and denitrification adsorption tower |
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| CN211987943U true CN211987943U (en) | 2020-11-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112870959A (en) * | 2021-03-19 | 2021-06-01 | 中国华电科工集团有限公司 | Ammonia spraying device and flue gas denitration device |
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2020
- 2020-01-15 CN CN202020084560.0U patent/CN211987943U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112870959A (en) * | 2021-03-19 | 2021-06-01 | 中国华电科工集团有限公司 | Ammonia spraying device and flue gas denitration device |
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