CN216935492U - Denitration ammonia injection grid - Google Patents
Denitration ammonia injection grid Download PDFInfo
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- CN216935492U CN216935492U CN202220725284.0U CN202220725284U CN216935492U CN 216935492 U CN216935492 U CN 216935492U CN 202220725284 U CN202220725284 U CN 202220725284U CN 216935492 U CN216935492 U CN 216935492U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model discloses a denitration ammonia injection grid which comprises an ammonia injection main pipe, a first branch pipe assembly, a second branch pipe assembly and a constant temperature and pressure system, wherein the ammonia injection main pipe is connected with the first branch pipe assembly; the first branch pipe assembly comprises at least two first branch pipes, the at least two first branch pipes are arranged at intervals along the length direction of the ammonia spraying mother pipe, the second branch pipe assembly is arranged on the first branch pipes, the second branch pipe assembly comprises a plurality of second branch pipes arranged at intervals along the length direction of the first branch pipes, and a plurality of ammonia spraying holes are formed in the second branch pipes; the constant temperature and constant pressure system is used for keeping the ammonia in the ammonia spraying main pipe and the first branch pipe assembly at constant temperature and constant pressure. The denitration ammonia injection grid can solve the problem that ammonia gas is unevenly distributed in flue gas when the ammonia injection grid is used for denitration of nitrogen oxides, so that the denitration efficiency is improved.
Description
Technical Field
The utility model relates to the technical field of flue gas denitration, in particular to a denitration ammonia injection grid.
Background
Nitrogen oxides, among which NO and NO, are among the most important sources of pollution causing atmospheric pollution, are known in many different forms2Is a major atmospheric pollutant, and also has a small amount of N2And (O). The emission of nitrogen oxides mainly comes from the direct combustion of energy sources such as coal. The method mainly comprises two measures for reducing the emission of nitrogen oxides, namely, the method controls the generation of the nitrogen oxides in the combustion process, namely, a low nitrogen oxide combustion technology; and secondly, treating the generated nitrogen oxide, namely a flue gas denitration technology.
Among the denitration technologies, the Selective Catalytic Reduction (SCR) is the most mature denitration technology with the highest denitration efficiency, and has become the mainstream denitration technology widely used at home and abroad. The uniformity and controllability of ammonia injection are main factors for determining the operation of SCR denitration, and the excessive ammonia injection can cause the blockage of an SCR denitration catalyst on the one hand, and can increase the escape amount of ammonia gas on the other hand, thereby causing secondary pollution to the environment. However, the existing denitration ammonia injection grid has fewer ammonia injection points and uneven ammonia injection, so that ammonia gas cannot be uniformly distributed in flue gas, and the ammonia gas amount existing at each point in the flue gas is large or small, so that the denitration efficiency is not stable enough, and the denitration efficiency is not high.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide a denitration ammonia injection grid, which aims to solve the problem that ammonia gas is unevenly distributed in flue gas when ammonia is injected for denitration of nitrogen oxides, so that the denitration efficiency is improved.
In order to achieve the above object, the denitration ammonia injection grid provided by the present invention comprises:
spraying ammonia to the mother pipe;
the first branch pipe assembly comprises at least two first branch pipes, and the at least two first branch pipes are arranged at intervals along the length direction of the ammonia spraying main pipe;
the second branch pipe assembly is arranged on the first branch pipe and comprises a plurality of second branch pipes which are arranged at intervals along the length direction of the first branch pipe, and a plurality of ammonia spraying holes are formed in the second branch pipes; and
and the constant temperature and constant pressure system is used for keeping the ammonia gas in the ammonia spraying main pipe and the first branch pipe assembly at constant temperature and constant pressure.
In an embodiment, the second branch pipe is provided with an open area, the ammonia spraying hole is formed in the open area, and the open areas of the second branch pipes of the second branch pipe assembly are different in position.
In one embodiment, the open areas of the second branch pipes of the second branch pipe assembly are arranged in a staggered manner along the length direction of the first branch pipe.
In an embodiment, on two adjacent first branch pipes, a plurality of second branch pipes of the second branch pipe assembly are arranged in a staggered manner along the length direction of the ammonia spraying mother pipe.
In one embodiment, the distance between two adjacent second branch pipes on the first branch pipe is equal.
In one embodiment, the distance between two adjacent second branch pipes on the first branch pipe is 400-800 mm.
In one embodiment, a first control valve is arranged at one end of the first branch pipe close to the ammonia spraying mother pipe, and a second control valve is arranged at one end of the second branch pipe close to the first branch pipe.
In one embodiment, the second branch pipe comprises a pipe joint, a connecting hose and an ammonia spraying pipe, wherein the pipe joint is connected with the first branch pipe, one end of the connecting hose is connected with the ammonia spraying pipe, and the other end of the connecting hose is connected with the pipe joint; the second control valve is arranged on the pipe joint, and the opening area is arranged on the ammonia spraying pipe.
In one embodiment, the diameter of the ammonia injection hole is 8-12mm, and the distance between two adjacent ammonia injection holes is 50-70 mm.
In one embodiment, the pipe diameter of the first branch pipe is 80-125mm, and the pipe diameter of the second branch pipe is 32-50 mm.
The denitration ammonia injection grid comprises an ammonia injection main pipe, a first branch pipe assembly and a second branch pipe assembly; the first branch pipe assembly comprises at least two first branch pipes, the first branch pipes are arranged along the length direction of the ammonia spraying mother pipe at intervals, the second branch pipe assembly is arranged on the first branch pipes, the second branch pipe assembly comprises a plurality of second branch pipes arranged along the length direction of the first branch pipes at intervals, and a plurality of ammonia spraying holes are formed in the second branch pipes. Traditional denitration ammonia injection grid spouts the ammonia point less and spout the ammonia inhomogeneous, leads to the unable evenly distributed of ammonia in the flue gas, and denitration efficiency is not high. According to the technical scheme, the plurality of first branch pipes and the plurality of second branch pipes are arranged, the ammonia spraying holes are formed in each second branch pipe, the number of ammonia spraying points is increased, ammonia can be uniformly distributed in flue gas, the denitration efficiency of the flue gas is improved, meanwhile, the heat exchanger and the pneumatic pressure stabilizing valve are used for controlling the pressure and the temperature of the ammonia in each stage of pipeline to be constant, and the second control valve is used for accurately adjusting the amount of the ammonia sprayed into each section of the flue.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural view of an embodiment of a denitration ammonia injection grid according to the present invention;
FIG. 2 is a side view of a denitration ammonia injection grid according to the present invention;
FIG. 3 is an enlarged view taken at A in FIG. 2;
FIG. 4 is a schematic diagram of the structure of FIG. 2 from another perspective;
FIG. 5 is a top view of the denitration ammonia injection grid of the present invention;
fig. 6 is an enlarged view at B in fig. 5.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | Denitration |
312 | Connecting |
| 100 | Ammonia spraying |
313 | |
| 200 | First |
313a | |
| 210 | |
313b | |
| 300 | Second |
400 | |
| 310 | |
500 | |
| 311 | Pipe joint |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, if appearing throughout the text, "and/or" is meant to include three juxtaposed aspects, taking "A and/or B" as an example, including either the A aspect, or the B aspect, or both A and B satisfied aspects. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1 to 6, in an embodiment of the present invention, the denitration ammonia injection grid 10 includes an ammonia injection main pipe 100, a first branch pipe assembly 200, a second branch pipe assembly 300, and a constant temperature and pressure system; the first branch pipe assembly 200 comprises at least two first branch pipes 210, the at least two first branch pipes 210 are arranged at intervals along the length direction of the ammonia spraying mother pipe 100, the second branch pipe assembly 300 is arranged on the first branch pipes 210, the second branch pipe assembly 300 comprises a plurality of second branch pipes 310 arranged at intervals along the length direction of the first branch pipes 210, and a plurality of ammonia spraying holes 313b are arranged on the second branch pipes 310; the constant temperature and pressure system is used for keeping the ammonia gas in the ammonia injection main pipe 100 and the first branch pipe assembly 200 at constant temperature and pressure.
Specifically, the first branch pipe assembly 200 includes at least two first branch pipes 210, the second branch pipe assembly 300 includes a plurality of second branch pipes 310, the plurality of second branch pipes 310 are disposed on the first branch pipes 210, the ammonia injection holes 313b are disposed on the second branch pipes 310, the first branch pipes 210 extend in a vertical direction, and the second branch pipes 310 extend in a horizontal direction. When the denitration ammonia injection grid 10 works, ammonia gas flows in from the ammonia injection main pipe 100, then flows into the first branch pipe assembly 200, then flows into the second branch pipe assembly 300 through the first branch pipe assembly 200, and finally is sprayed out from the ammonia injection holes 313b to the flue to be mixed with flue gas. The number of first branch pipe 210 with second branch pipe 310 sets up to at least two, can increase the point number of spouting the ammonia point, and when spouting ammonia area is definite, the ammonia of a plurality of ammonia point spouts can with the flue gas intensive mixing in the flue to improve denitration efficiency. In this embodiment, first branch pipe assembly 200 includes 10 first branch pipes 210, every be provided with 4 second branch pipes 310 on the first branch pipe 210, every 10 ammonia injection holes 313b have been seted up on the second branch pipe 310, so, this denitration ammonia injection grid 10 includes 40 second branch pipes 310 to 400 ammonia injection holes 313b have been seted up altogether, so set up, when ammonia injection area is definite, the quantity of ammonia injection point has been increased, make ammonia injection more even, ammonia can evenly distributed in the flue gas, thereby ammonia and flue gas can the intensive mixing take place the reaction, improve denitration efficiency. The pipe cross-sections of the ammonia injection mother pipe 100, the first branch pipe 210 and the second branch pipe 310 may be set to be square, prismatic, circular or other shapes, which is not limited in particular.
The plurality of first branch pipes 210 are arranged along the length direction of the ammonia injection main pipe 100 at intervals, the plurality of first branch pipes 210 may be arranged along the length direction of the ammonia injection main pipe 100 at equal intervals, or may be arranged at unequal intervals, specifically in this embodiment, the plurality of first branch pipes 210 are arranged along the length direction of the ammonia injection main pipe 100 at equal intervals. Likewise, a plurality of second branch pipes 310 are arranged at equal intervals along the length direction of the first branch pipe 210.
The constant temperature and constant pressure system comprises a heat exchanger, a constant temperature pipe and a pneumatic pressure stabilizing valve, wherein the heat exchanger is used for exchanging heat for air, the constant temperature pipe wraps the ammonia spraying main pipe 100 and the first branch pipe assembly 200, and a gap exists between the constant temperature pipe and the ammonia spraying main pipe 100 and the first branch pipe assembly 200. After the heat exchanger exchanges heat of air into hot air, the hot air flows to a thermostatic pipe and flows in a gap between the thermostatic pipe and the ammonia spraying main pipe 100 and a gap between the thermostatic pipe and the first branch pipe assembly 200 to ensure the temperature of ammonia in the ammonia spraying main pipe 100 and the ammonia spraying main pipe assembly 200 to be constant, a pneumatic pressure stabilizing valve is arranged on the ammonia spraying main pipe 100 to automatically adjust the pressure of ammonia to ensure the pressure of ammonia to be constant, a pressure gauge is arranged on the first branch pipe assembly 200 to ensure the temperature and the pressure of ammonia spraying in the first branch pipe 210 to be constant by utilizing the adjustment of a second control valve 500, ammonia spraying holes 313b are uniformly formed in a second branch pipe 310, the diameter of the ammonia spraying holes 313b is small, the distance among a plurality of the ammonia spraying holes 313b is small, and the number of the ammonia spraying holes 313b is certain (generally less than 10), so that the ammonia amount sprayed by the ammonia spraying holes 313b is more stable and uniform.
Because the flue internal area is limited, and the flue gas mainly mixes with the ammonia and reacts, consequently spout the setting of ammonia mother pipe 100 and first branch pipe subassembly 200 sets up outside the flue, then stretch into inside the flue with second branch pipe subassembly 300, spout ammonia hole 313b and set up on second branch pipe 310, spout ammonia hole 313b and spout ammonia and the flue gas and mix and react when denitration ammonia injection grid 10 is worked. The ammonia injection main pipe 100 and the first branch pipe assembly 200 are arranged outside the flue, so that the volume of the flue occupied by the denitration ammonia injection grid 10 can be reduced.
The denitration ammonia injection grid 10 comprises an ammonia injection main pipe 100, a first branch pipe assembly 200 and a second branch pipe assembly 300; the first branch pipe assembly 200 comprises at least two first branch pipes 210, at least two of the first branch pipes 210 are arranged along the length direction of the ammonia spraying mother pipe 100 at intervals, the second branch pipe assembly 300 is arranged on the first branch pipes 210, the second branch pipe assembly 300 comprises a plurality of second branch pipes 310 arranged along the length direction of the first branch pipes 210 at intervals, and a plurality of ammonia spraying holes 313b are formed in the second branch pipes 310. Traditional denitration ammonia injection grid 10 spouts the ammonia point less and spout the ammonia inhomogeneous, leads to the unable evenly distributed of ammonia in the flue gas, and denitration efficiency is not high. According to the technical scheme, the plurality of first branch pipes 210 and the plurality of second branch pipes 310 are arranged, the ammonia spraying holes 313b are formed in each second branch pipe 310, the number of ammonia spraying points is increased, ammonia gas can be uniformly distributed in flue gas, the denitration efficiency of the flue gas is improved, meanwhile, the heat exchanger and the pneumatic pressure stabilizing valve are used for controlling the pressure and the temperature of the ammonia gas in each stage of pipeline to be constant, and the second control valve 500 is used for accurately adjusting the amount of the ammonia sprayed into each section of the flue.
Referring to fig. 2 and fig. 6, in an embodiment, the second branch pipe 310 is provided with an opening area 313a, the ammonia spraying holes 313b are formed in the opening area 313a, and the positions of the opening areas 313a of the plurality of second branch pipes 310 of the second branch pipe assembly 300 are different. Specifically, the second branch pipe assembly 300 is disposed on the first branch pipe 210 extending in the vertical direction, and the second branch pipe assembly 300 includes a plurality of second branch pipes 310, the plurality of second branch pipes 310 are arranged at intervals along the length direction of the first branch pipe 210, and the second branch pipes 310 extend into the flue to spray ammonia, so that the plurality of second branch pipes 310 are disposed in multiple layers in the vertical direction. In order to avoid the repeated ammonia injection in the up-and-down direction in the flue during the ammonia injection of the ammonia injection holes 313b, the positions of the opening regions 313a of the plurality of second branch pipes 310 are different, thereby avoiding the above problem. The positions of the opening areas 313a of the second branch pipes 310 of two adjacent groups of second branch pipe assemblies 300 are also different, so that the situation that ammonia gas sprayed from the ammonia spraying holes 313b in the inner part of the flue cannot cover the flue is avoided, and the denitration efficiency is not high.
Referring to fig. 2 and 3, further, the plurality of opening regions 313a of the second branch pipe 310 of the second branch pipe assembly 300 are disposed along the length direction of the first branch pipe 210 in a staggered manner. Specifically, the plurality of opening areas 313a of the second branch pipes 310 are arranged along the length direction of the first branch pipe 210 in a staggered manner, that is, the plurality of opening areas 313a of the second branch pipes 310 are arranged along the up-down direction in a staggered manner, so that the ammonia spraying holes 313b of the plurality of second branch pipes 310 arranged on the same first branch pipe 210 can be completely covered in the up-down direction when ammonia spraying is performed, and the situation that ammonia sprayed from the ammonia spraying holes 313b in partial areas in the flue cannot be covered is avoided, thereby resulting in low denitration efficiency.
Referring to fig. 4, in an embodiment, on two adjacent first branch pipes 210, a plurality of second branch pipes 310 in the second branch pipe assembly 300 are disposed in a staggered manner along the length direction of the ammonia injection main pipe 100. Specifically, the conventional denitration ammonia injection grid is formed by dividing a main pipe into a plurality of branch pipes, wherein the branch pipes are provided with the ammonia injection holes 313b at the same position, so that the injection amount of ammonia gas is almost on the same section of flue gas, the ammonia injection is easy to form laminar flow, the ammonia injection amount is uneven in different sections, the ammonia injection hole 313b close to the main pipe has larger ammonia injection amount, and the ammonia injection amount far away from the main pipe is smaller, so that the ammonia injection is uneven. The utility model provides an ammonia grid 10 is spouted in denitration, adjacent two a plurality of in the second branch pipe assembly 300 on the first branch pipe 210 second branch pipe 310 is following the length direction (the horizontal direction) of spouting the female pipe 100 of ammonia is the dislocation set, so can be formed with a plurality of horizontal planes to cover multilayer flue gas cross-section, and every flue gas cross-section spouts ammonia pressure, flow evenly controllable, can avoid laminar flow's emergence.
Referring to fig. 2 to 5, in an embodiment, the distance between two adjacent second branch pipes 310 on the first branch pipe 210 is equal. The distance between two adjacent second branch tubes 310 on the first branch tube 210 is 400 mm and 800mm, which can be selected according to practical situations and is not particularly limited. Specifically, in this embodiment, the distance between two adjacent second branch pipes 310 on the first branch pipe 210 is set. Specifically, in this embodiment, the height of the flue is 2.6m, and considering that the ammonia gas and the flue gas need to be mixed sufficiently, the number of the second branch pipes 310 arranged on the first branch pipe 210 is set to 4, and the distance between two adjacent second branch pipes 310 is 600mm, so that the ammonia gas sprayed from the ammonia spraying holes 313b can be mixed sufficiently with the flue gas in the flue, thereby improving the denitration efficiency of the flue gas.
When the distance between two adjacent second branch pipes 310 is too large, due to the limitation of factors such as the diameter of the ammonia injection hole 313b, the length of the second branch pipe 310, the pressure of the ammonia injection pipe 313 and the like, the amount of ammonia injected from the ammonia injection hole 313b is small, and the ammonia is difficult to fully react with flue gas, so that the denitration efficiency of the flue gas is not high, and meanwhile, when the height of a flue is fixed, the number of the second branch pipes 310 is reduced due to the overlarge distance between two adjacent second branch pipes 310, so that the number of the ammonia injection holes 313b is reduced, and the ammonia injection amount is reduced. When the distance between two adjacent second branch pipes 310 is too small, when the height of the flue is fixed, the number of the second branch pipes 310 can be increased, so that the ammonia spraying amount is further increased, excessive ammonia gas is not mixed with the flue gas to react, waste is caused, and the environment is damaged. Therefore, in other embodiments, the distance between two adjacent second branch pipes 310 disposed on the first branch pipe 210 may be actually selected according to the height, width, and other factors of the flue, and is not particularly limited.
Referring to fig. 2 to 5, in an embodiment, a first control valve 400 is disposed at an end of the first branch pipe 210 close to the ammonia injection main pipe 100, and a second control valve 500 is disposed at an end of the second branch pipe 310 close to the first branch pipe 210.
Specifically, the first control valve 400 is used for controlling the on-off of the ammonia gas in each first branch pipe 210, and the second control valve 500 is used for controlling the on-off of the ammonia gas in each second branch pipe 310. When repair or maintenance of a certain first branch pipe 210 is required, the flow of ammonia gas through the first branch pipe 210 is shut off by controlling the first control valve 400 to be closed, and then repair or maintenance work is performed on the first branch pipe 210. Meanwhile, the maintenance of the first branch pipe 210 does not affect the normal work of other first branch pipes 210, so that the ammonia injection grid can perform ammonia injection work while being maintained or maintained, the operation of the ammonia injection grid is not affected, and the problem of nitrogen oxide standard exceeding emission caused after the ammonia injection grid is closed due to the maintenance or the maintenance of the first branch pipe 210 is avoided. Similarly, when repair or maintenance is required for a certain second branch pipe 310, the second control valve 500 may be controlled to be closed, so as to cut off the flow of ammonia gas through the second branch pipe 310, and then the second branch pipe 310 may be subjected to repair or maintenance work. Meanwhile, the maintenance of the second branch pipe 310 does not affect the normal work of other second branch pipes 310, so that the ammonia injection grille performs ammonia injection work while being maintained, the operation of the ammonia injection grille is not affected, and the problem of nitrogen oxide overproof emission caused by closing the ammonia injection grille due to the maintenance of the second branch pipe 310 is avoided.
Referring to fig. 2 to 6, on the basis of the foregoing embodiment, the second branch pipe 310 includes a pipe joint 311, a connection hose 312 and an ammonia injection pipe 313, one end of the pipe joint 311 is connected to the first branch pipe 210, one end of the connection hose 312 is connected to the ammonia injection pipe 313, and the other end is connected to the pipe joint 311.
Specifically, the pipe joint 311 is welded to the first branch pipe 210 by welding, the ammonia injection pipe 313 is connected to the pipe joint 311 by the connection hose 312, and when a certain ammonia injection pipe 313 needs to be replaced or repaired, only the ammonia injection pipe 313 needing to be replaced needs to be pulled out of the connection hose 312, and then a new ammonia injection pipe 313 is replaced. This arrangement facilitates replacement of the ammonia injection pipe 313.
Referring to fig. 2 to 6, in the foregoing embodiment, the second control valve 500 is disposed on the pipe joint 311, and the opening area 313a is disposed on the ammonia injection pipe 313. Specifically, since the ammonia injection pipe 313 needs to be pulled out from the connection hose 312 for replacement when the ammonia injection pipe 313 is replaced and the ammonia injection operation cannot be performed for this ammonia injection pipe 313 during replacement, the second control valve 500 is provided in the pipe joint 311, and when maintenance or replacement of the ammonia injection pipe 313 is necessary, the ammonia gas in the ammonia injection pipe 313 is not circulated by controlling the second control valve 500 to be closed, and then the ammonia injection pipe 313 is replaced. The ammonia spraying pipe 313 is a section extending into the flue, so the open hole area 313a is arranged on the ammonia spraying pipe 313, so that ammonia gas is sprayed out from the flue and is fully mixed with flue gas, and the flue gas is subjected to denitration treatment.
Based on any one of the above embodiments, the opening direction of the ammonia injection hole 313b is the same as the flow direction of the flue gas. Specifically, the opening direction of the ammonia injection holes 313b is the same as the flow direction of the flue gas, so that foreign matters in the flue gas can be prevented from blocking the ammonia injection holes 313b, and the denitration effect of the denitration ammonia injection grid 10 can be prevented from being influenced.
Referring to fig. 1 to 6, based on any of the above embodiments, the diameter of the ammonia injection holes 313b is 8-12mm, the distance between two adjacent ammonia injection holes 313b is 50-70mm, the pipe diameter of the first branch pipe 210 is 80-125mm, and the pipe diameter of the second branch pipe 310 is 32-50mm, which can be specifically selected according to actual needs and is not limited specifically. In the embodiment, considering that the width and height of the flue are both 2.6m, in order to make the ammonia gas and the flue gas fully mixed, the flue gas can cover each flue gas section, and in order to make the pressure and flow of the ammonia injection uniform and controllable, the pipe diameter of the first branch pipe 210 is set to be 100mm, and the pipe diameter of the second branch pipe 310 is set to be 40 mm. Simultaneously, spout ammonia hole 313 b's diameter is 10mm, and adjacent two spout the interval between ammonia hole 313b and set up to D, D60 mm for can be so that lie in and spout the flue gas homoenergetic of ammonia zone within range and mix with the ammonia, further improve denitration efficiency.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The utility model provides a denitration ammonia injection grid which characterized in that, denitration ammonia injection grid includes:
spraying ammonia to the mother pipe;
the first branch pipe assembly comprises at least two first branch pipes, and the at least two first branch pipes are arranged at intervals along the length direction of the ammonia spraying main pipe;
the second branch pipe assembly is arranged on the first branch pipe and comprises a plurality of second branch pipes which are arranged at intervals along the length direction of the first branch pipe, and a plurality of ammonia spraying holes are formed in the second branch pipes; and
and the constant temperature and constant pressure system is used for keeping the ammonia gas in the ammonia spraying main pipe and the first branch pipe assembly at constant temperature and constant pressure.
2. The denitration ammonia injection grid according to claim 1, wherein said second branch pipes are provided with perforated areas, said ammonia injection holes are provided in said perforated areas, and the positions of the perforated areas of said second branch pipes of said second branch pipe assembly are different.
3. The denitration ammonia injection grid of claim 2, wherein the perforated areas of the plurality of second branch pipes of the second branch pipe assembly are arranged in a staggered manner along the length direction of the first branch pipe.
4. The denitration ammonia injection grid of claim 3, wherein a plurality of second branch pipes of the second branch pipe assembly are arranged in a staggered manner along the length direction of the ammonia injection main pipe on two adjacent first branch pipes.
5. The denitration ammonia injection grid of claim 4, wherein the spacing between two adjacent second branch pipes on the first branch pipe is equal.
6. The denitration ammonia injection grid of claim 5, wherein the distance between two adjacent second branch pipes on the first branch pipe is 400-800 mm.
7. The denitration ammonia injection grid of any one of claims 2 to 6, wherein a first control valve is provided at an end of the first branch pipe close to the ammonia injection header pipe, and a second control valve is provided at an end of the second branch pipe close to the first branch pipe.
8. The denitration ammonia injection grid of claim 7, wherein the second branch pipe comprises a pipe joint, a connecting hose and an ammonia injection pipe, the pipe joint is connected with the first branch pipe, one end of the connecting hose is connected with the ammonia injection pipe, and the other end of the connecting hose is connected with the pipe joint; the second control valve is arranged on the pipe joint, and the opening area is arranged on the ammonia spraying pipe.
9. The denitration ammonia injection grid of any one of claims 1 to 6, wherein the diameter of the ammonia injection holes is 8-12mm, and the distance between two adjacent ammonia injection holes is 50-70 mm.
10. The denitration ammonia injection grid of any one of claims 1 to 6, wherein the pipe diameter of the first branch pipe is 80-125mm, and the pipe diameter of the second branch pipe is 32-50 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220725284.0U CN216935492U (en) | 2022-03-29 | 2022-03-29 | Denitration ammonia injection grid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220725284.0U CN216935492U (en) | 2022-03-29 | 2022-03-29 | Denitration ammonia injection grid |
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| Publication Number | Publication Date |
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| CN216935492U true CN216935492U (en) | 2022-07-12 |
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| CN202220725284.0U Active CN216935492U (en) | 2022-03-29 | 2022-03-29 | Denitration ammonia injection grid |
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| CN (1) | CN216935492U (en) |
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- 2022-03-29 CN CN202220725284.0U patent/CN216935492U/en active Active
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