SCR (Selective Catalytic Reduction) denitration system
By introducing baffles, premixers, ammonia injection grids, and catalyst layers into the SCR denitrification system, combined with staggered nozzles and anti-clogging nozzles, the clogging problem caused by ammonia escape was solved, achieving uniform ammonia injection and efficient NOx conversion.
Patent Information
- Application Number
- CN202422893516.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-11-26
AI Technical Summary
Existing SCR denitrification systems have a large ammonia slip, which can easily cause blockages and affect downstream equipment.
The SCR denitrification system includes a flue gas deflector, a flue gas premixer, a main ammonia injection grid, an ammonia-flue gas turbulence diffuser, a main catalyst layer, a supplementary ammonia injection grid, and a supplementary catalyst layer. Through multiple vertically arranged ammonia injection branch pipes and staggered nozzles, combined with ammonia control valves and anti-clogging nozzles, uniform ammonia injection and mixing are achieved, reducing escape.
This achieves uniform ammonia injection, reduces escape, improves NOx conversion rate, prevents blockage, and enhances the system's adaptability and efficiency.
Smart Images
Figure CN223615685U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of flue gas denitrification technology, specifically relating to an SCR denitrification system. Background Technology
[0002] To reduce NOx emissions from coal-fired power generation, flue gas denitrification technology is a commonly used method. Among them, selective catalytic reduction (SCR) denitrification technology refers to the reaction of a reducing agent (ammonia) with nitrogen oxides in flue gas under the action of a catalyst to generate harmless nitrogen and water, thereby removing NOx from the flue gas. The efficient and stable operation of SCR denitrification devices has received widespread attention. In existing SCR denitrification devices, an ammonia injection grid is horizontally arranged at a certain height in the flue, and the nozzles of the ammonia injection grid are arranged in the leeward direction of the ammonia injection grid. Ammonia is injected into the flue gas along the flue gas flow direction. The mixed gas reacts with the flue gas in the catalytic chamber to achieve denitrification. However, in the process of catalytic reduction of NOx in the flue gas to N2, a certain amount of ammonia escape is inevitable. When the ammonia escape level is too large, the escaped ammonia will form severe ammonium bisulfate blockage with SO3 in the flue gas at the cold end of the air preheater, which can easily cause blockage of the air preheater and have an adverse effect on downstream dust removal equipment, low-pressure economizers, etc. Therefore, it is necessary to develop a device that can improve the accuracy of ammonia injection and reduce ammonia escape. Utility Model Content
[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an SCR denitrification system to solve the technical problems of large ammonia slip and easy blockage of the SCR denitrification system in the existing technology.
[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0005] An SCR denitrification system includes an SCR denitrification tower, wherein a flue gas guide plate, a flue gas premixer, a main ammonia injection grid, an ammonia-flue gas turbulence breaker, a main catalyst layer, a supplementary ammonia injection grid, and a supplementary catalyst layer are sequentially arranged along the flue gas flow direction inside the SCR denitrification tower.
[0006] The main ammonia injection grid includes multiple first ammonia injection branch pipes arranged in parallel at equal intervals perpendicular to the flue gas flow direction. Each first ammonia injection branch pipe has a row of first nozzles and a row of second nozzles arranged obliquely along its length. Each row of nozzles contains several nozzles. The first nozzles and second nozzles are arranged alternately and have different orientations.
[0007] Each of the aforementioned ammonia injection branch pipes is connected to the ammonia supply pipe, and each of the aforementioned first ammonia injection branch pipes is equipped with an ammonia control valve.
[0008] This utility model also has the following technical features:
[0009] Specifically, both the first nozzle and the second nozzle are equipped with anti-clogging nozzles at their tips.
[0010] Furthermore, the ammonia supply pipe is provided with an air inlet and a mixed gas outlet at both ends, and at least one mounting hole is provided on the pipe wall, through which an ammonia gas supply pipe is inserted; the air inlet is connected to an air duct, and the mixed gas outlet is connected to the ammonia gas inlet pipe.
[0011] Furthermore, the ammonia gas supply pipe is provided with multiple ammonia gas supply outlets.
[0012] Furthermore, the supplementary ammonia injection grid includes multiple parallel second ammonia injection branch pipes, each of which is equipped with multiple third nozzles, which are arranged opposite to the flue gas flow direction.
[0013] Furthermore, the ammonia-fume turbulence diffuser includes a base plate on which multiple blade mounting holes are provided, and the multiple blade mounting holes are arranged at equal intervals along the longitudinal and transverse directions; turbulence blades are movably installed in the blade mounting holes.
[0014] Furthermore, the SCR denitrification tower has a flue gas inlet at the top and a clean gas outlet at the bottom; the interior space of the SCR denitrification tower forms a reaction chamber.
[0015] The reaction chamber between the flue gas inlet and the flue gas guide plate is a guide chamber; the reaction chamber between the flue gas guide plate and the flue gas premixer is a premixing chamber; the reaction chamber between the flue gas premixer and the main ammonia injection grid is the main ammonia injection chamber; the reaction chamber between the main ammonia injection grid and the ammonia-flue gas turbulence diffuser is a turbulence chamber; the reaction chamber between the ammonia-flue gas turbulence diffuser and the main catalyst layer is the main catalytic chamber; the reaction chamber between the main catalyst layer and the supplementary ammonia injection grid is the supplementary ammonia injection chamber; the reaction chamber between the supplementary ammonia injection grid and the supplementary catalyst layer is the supplementary catalytic chamber; and the reaction chamber between the supplementary catalyst layer and the clean gas outlet is the gas outlet chamber. The flue gas inlet is sequentially connected to the guide chamber, the premixing chamber, the main ammonia injection chamber, the turbulence chamber, the main catalytic chamber, the supplementary ammonia injection chamber, the supplementary catalytic chamber, the gas outlet chamber, and the clean gas outlet.
[0016] Furthermore, the flue gas inlet is connected to an inlet pipe, the clean gas outlet is connected to an outlet pipe, and NOx concentration detectors are installed in the inlet pipe, the ammonia injection chamber, and the outlet pipe.
[0017] Furthermore, an ammonia detector is also installed inside the gas outlet pipe.
[0018] Compared with the prior art, this utility model has the following technical effects:
[0019] (1) The SCR denitrification system of this utility model reduces ammonia slip by using the main ammonia injection grid and the supplementary ammonia injection grid together, and achieves uniform injection of ammonia in the entire reaction space, ensuring that ammonia slip is maintained at a reasonable level. The main ammonia injection grid is composed of multiple first ammonia injection branch pipes, and the ammonia flow rate in each first ammonia injection branch pipe can be adjusted individually, realizing the adjustability of ammonia concentration on the same cross section in the SCR denitrification tower. By using the main catalyst layer and the supplementary catalyst layer together, the conversion rate of NOx in the flue gas is improved, and the supplementary catalyst layer has a small thickness and a simple structure.
[0020] (2) In the SCR denitrification system of this utility model, pure ammonia and dilution air are mixed evenly in the ammonia supply pipe, which ensures that the ammonia concentration distribution in the ammonia injection branch pipe is uniform. Furthermore, the ammonia nozzle is equipped with anti-wear and anti-clogging nozzles, which can effectively protect the nozzles and achieve the function of uniform flow and anti-clogging.
[0021] (3) This utility model uses a flue guide plate and a flue gas premixer to evenly distribute the flue gas coming from upstream, which can improve the flue gas flow field, reduce the impact of operating condition changes on the NOx distribution of the denitrification inlet flue section, and improve the full load adaptability of the ammonia injection system. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the overall structure of the device of this utility model, wherein the arrow indicates the direction of flue gas flow;
[0023] Figure 2 A three-dimensional structural diagram of the main ammonia injection grille;
[0024] Figure 3 A partial structural diagram of the main ammonia injection grille;
[0025] Figure 4 This is a schematic diagram of the ammonia supply pipe structure;
[0026] Figure 5 This is a rear view of the first ammonia injection branch pipe;
[0027] Figure 6 This is a schematic diagram of the ammonia-fume turbulence diffuser.
[0028] The meanings of the labels and symbols in the diagram are as follows:
[0029] 1-SCR denitrification tower, 2-reaction chamber, 3-flue baffle, 4-flue gas premixer, 5-main ammonia injection grid, 6-ammonia-flue gas turbulence breaker, 7-main catalyst layer, 8-supplementary ammonia injection grid, 9-supplementary catalyst layer, 10-ammonia control valve, 11-inlet pipe, 12-outlet pipe, 13-NOx concentration detector, 14-ammonia detector;
[0030] 101 - Flue gas inlet, 102 - Clean gas outlet;
[0031] 201-Flow guide chamber, 202-Premix chamber, 203-Ammonia injection chamber, 204-Break chamber, 205-Main catalytic converter chamber, 206-Supplementary ammonia injection chamber, 207-Supplementary catalytic converter chamber, 208-Gas outlet chamber;
[0032] 501-First ammonia injection branch pipe, 502-First nozzle, 503-Second nozzle, 504-Ammonia supply pipe, 505-Ammonia gas supply pipe, 506-Anti-clogging nozzle;
[0033] 601 - Substrate; 602 - Blade mounting hole; 603 - Baffle blade;
[0034] 801 - Second ammonia injection branch pipe, 802 - Third nozzle;
[0035] 5041 - Air inlet, 5042 - Mixed gas outlet, 5043 - Mounting hole;
[0036] 5051 - Ammonia gas outlet.
[0037] The specific content of this utility model will be further explained in detail below with reference to the embodiments. Detailed Implementation
[0038] It should be noted that, unless otherwise specified, all components and instruments in this utility model are known in the art. For example, the flue guide plate is a conventional gas guide plate known in the prior art, such as a gas guide plate composed of multiple guide plates.
[0039] The flue gas premixer uses a conventional gas premixer known in the existing technology, also called a flue gas mixer.
[0040] NO X The concentration detector uses a conventional nitrogen oxide detector known in the prior art, and the ammonia detector also uses a conventional ammonia detector known in the prior art. The ammonia control valve is a conventional gas control valve.
[0041] The terms “upper,” “lower,” “front,” “rear,” “top,” and “bottom” used in this utility model are for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. “Inner” and “outer” refer to the inner and outer contours of the corresponding components, and the above terms should not be construed as limitations on this utility model.
[0042] Furthermore, the terms "first," "second," and other ordinal numbers are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of that feature.
[0043] Unless otherwise stated, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0044] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.
[0045] Example:
[0046] Following the above technical solutions, such as Figure 1 As shown, this embodiment provides an SCR denitrification system, including an SCR denitrification tower 1. Inside the SCR denitrification tower 1, along the flue gas flow direction, there are sequentially arranged a flue guide plate 3, a flue gas premixer 4, a main ammonia injection grid 5, an ammonia-flue gas turbulence breaker 6, a main catalyst layer 7, a supplementary ammonia injection grid 8, and a supplementary catalyst layer 9.
[0047] like Figure 2 , Figure 3 and Figure 5 As shown, the main ammonia injection grid 5 includes multiple first ammonia injection branch pipes 501 arranged parallel to each other at equal intervals perpendicular to the flue gas flow direction. On the upper half of the pipe wall of each first ammonia injection branch pipe 501, a row of first nozzles 502 and a row of second nozzles 503 are respectively inclined along the length direction. The first nozzles 502 and second nozzles 503 are staggered and have different orientations; there are multiple first nozzles 502 and multiple second nozzles 503. In this embodiment, the first nozzles 502 are inclined to the upper left, and the second nozzles 503 are inclined to the upper right. The included angle formed by the projections of the first nozzles 502 and the second nozzles 503 in the same vertical plane is 30~150°. Baffles are fitted onto both the first nozzles 502 and the second nozzles 503.
[0048] Each first ammonia injection branch pipe 501 is connected to an ammonia supply pipe 504, which is used to introduce a mixture of ammonia and air into the ammonia supply pipe. Each first ammonia injection branch pipe 501 is equipped with an ammonia control valve 10.
[0049] In other schemes, the main ammonia injection grid 5 can be divided into multiple ammonia injection grid units. The flow rate of ammonia in each ammonia injection grid unit can be adjusted by an independently set ammonia control valve 10, thereby adjusting the ammonia injection amount of each ammonia injection grid unit, so as to adjust the ammonia concentration at a certain cross section above and below the main ammonia injection grid 5.
[0050] As a preferred embodiment, both the first nozzle 502 and the second nozzle 503 are provided with anti-clogging nozzles 506 at their tips.
[0051] In this embodiment, the SCR denitrification tower 1 has a flue gas inlet 101 at the top and a clean gas outlet 102 at the bottom. The internal space of the SCR denitrification tower 1 forms a reaction chamber 2. After the flue gas enters the SCR denitrification tower 1 through the flue gas inlet 101, it moves along the flue gas flow direction, and the purified flue gas is discharged from the clean gas outlet 102. The flue gas guide plate 3 and the flue gas premixer 4 are mainly used to evenly distribute the incoming flue gas and improve the flue gas flow field, with the flue gas velocity distribution deviation not exceeding 15%. Preferably, the SCR denitrification tower 1 is also connected to a cold air bypass, which adjusts the flue gas temperature entering the SCR denitrification tower 1 by inputting cold air to exchange heat with the high-temperature flue gas, so that the operating temperature inside the SCR denitrification tower 1 is maintained at 320-420°C. The reaction between NOx and ammonia in the flue gas takes place in the main catalyst layer 7 and the supplementary catalyst layer 9. Both the main catalyst layer 7 and the supplementary catalyst layer 9 are filled with known conventional denitrification catalysts, such as catalysts with titanium dioxide as the main component. The main catalyst layer 7 adopts a "2+1" installation method, that is, the middle and lower layers are initially installed, and the upper layer is reserved. The upper layer can be added later according to the initial NOx concentration and denitrification efficiency of the original flue gas. The supplementary catalyst layer 9 is installed as a single layer. The supplementary catalyst layer 9 is used to further carry out the denitrification reaction to improve the denitrification efficiency.
[0052] By using the main catalyst layer and the supplementary catalyst layer in combination, the conversion rate of NOx in the flue gas is improved, and the supplementary catalyst layer is appropriately thinned, resulting in a simple structure.
[0053] As a preferred embodiment of this invention, such as Figure 4 As shown, the ammonia supply pipe 504 has an air inlet 5041 and a mixed gas outlet 5042 at both ends. At least one mounting hole 5043 is also provided on the pipe wall of the ammonia supply pipe 504, through which an ammonia gas supply pipe 505 passes. An air pipe is connected to the air inlet 5041, and the mixed gas outlet 5042 is connected to the first ammonia injection branch pipe 501. The ammonia supply pipe 504 extends to the outside of the SCR denitrification tower 1 and connects to the ammonia storage tank.
[0054] As a preferred embodiment, the ammonia supply pipe 505 is provided with multiple ammonia supply ports 5051. The ammonia gas in the ammonia supply pipe 505 enters the ammonia supply pipe 504 through the ammonia supply ports 5051, and mixes with the air entering through the air inlet 5041 to obtain a mixed gas. The mixed gas enters the first ammonia injection branch pipe 501 through the mixed gas outlet 5042.
[0055] As a preferred embodiment, the supplementary ammonia injection grid 8 includes multiple parallel second ammonia injection branch pipes 801, each of which is provided with multiple third nozzles 802, which are arranged away from the flue gas flow direction.
[0056] like Figure 6 As shown, in a preferred embodiment, the ammonia-smoke turbulence diffuser 6 includes a base plate 601, on which a plurality of blade mounting holes 602 are formed. The plurality of blade mounting holes 602 are arranged at equal intervals along the longitudinal and transverse directions. A turbulence-causing blade 603 is movably mounted in the blade mounting holes 602. The turbulence-causing blade 603 can rotate 360 degrees within the blade mounting holes 602 and can swing to both sides about the center axis.
[0057] As one specific solution in this embodiment, such as Figure 1 As shown, the SCR denitrification tower 1 has a flue gas inlet 101 at the top and a clean gas outlet 102 at the bottom. The internal space of the SCR denitrification tower 1 forms a reaction chamber 2. The reaction chamber 2 between the flue gas inlet and the flue guide plate 3 is a guide chamber 201; the reaction chamber 2 between the flue guide plate 3 and the flue gas premixer 4 is a premixing chamber 202; the reaction chamber 2 between the flue gas premixer 4 and the main ammonia injection grid 5 is a main ammonia injection chamber 203; the reaction chamber 2 between the main ammonia injection grid 5 and the ammonia-flue gas turbulence diffuser 6 is a turbulence chamber 204; and the reaction chamber 2 between the ammonia-flue gas turbulence diffuser 6 and the main catalyst layer 7... The reaction chamber 2 between the main catalyst layer 7 and the supplementary ammonia injection grid 8 is the supplementary ammonia injection chamber 206, the reaction chamber 2 between the supplementary ammonia injection grid 8 and the supplementary catalyst layer 9 is the supplementary catalyst chamber 207, and the reaction chamber 2 between the supplementary catalyst layer 9 and the clean gas outlet is the gas outlet chamber 208. The flue gas inlet 101 is connected in sequence to the guide chamber 201, the premix chamber 202, the main ammonia injection chamber 203, the turbulence chamber 204, the main catalyst chamber 205, the supplementary ammonia injection chamber 206, the supplementary catalyst chamber 207, the gas outlet chamber 208, and the clean gas outlet 102.
[0058] In a preferred embodiment, an intake pipe 11 is connected to the flue gas inlet 101, and an outlet pipe 12 is connected to the clean gas outlet 102. NOx concentration detectors 13 are installed on the intake pipe 11, the ammonia injection chamber 206, and the outlet pipe 12. XThe detector 13 can detect the NOx concentration at multiple measuring points and feed the results back to the connected control system. The control system uses pre-installed software to control the opening of the ammonia control valve 10 to adjust the ammonia injection rate, thereby controlling the NOx concentration in the flue gas. X Precise ammonia injection.
[0059] As one specific solution in this embodiment, such as Figure 1 As shown, an ammonia detector 14 is also installed on the gas outlet pipe 12.
[0060] The working process of this utility model mainly includes the following steps:
[0061] Step 1: Flue gas enters the SCR denitrification tower 1 through flue gas inlet 101. After passing through the guide chamber 201, flue guide plate 3, premix chamber 202 and flue gas premixer 4 in sequence, the flue gas enters the ammonia injection chamber 203 and the turbulence chamber 204.
[0062] Step 2: Open the ammonia control valve, and the ammonia mixed with air enters the ammonia supply pipe, then flows into the first ammonia injection branch pipe 501, and then is injected into the ammonia injection chamber 203 and the turbulence chamber 204 through the first nozzle 502 and the second nozzle 503.
[0063] Step 3: Flue gas and ammonia are mixed in ammonia injection chamber 203 and turbulence chamber 204, and then enter the main catalytic chamber 205. The reaction takes place under the action of the catalyst to achieve primary denitrification.
[0064] Step 4: After the flue gas from the first denitrification enters the supplementary ammonia injection chamber 206, the ammonia mixed with air enters the second ammonia injection branch pipe 801 and is then sprayed out through the third nozzle 802; the ammonia mixed with air mixes with the ammonia from the first denitrification and enters the supplementary main catalytic chamber 207; under the action of the catalyst in the supplementary catalyst layer 9, a reaction is carried out to achieve secondary denitrification.
[0065] Step 5: The flue gas after secondary denitrification enters the exhaust chamber 208 and is finally discharged from the clean gas outlet 102.
[0066] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.
[0067] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.
Claims
1. An SCR denitrification system, comprising an SCR denitrification tower (1), characterized in that, The SCR denitrification tower (1) is provided with a flue guide plate (3), a flue gas premixer (4), a main ammonia injection grid (5), an ammonia-flue gas turbulence generator (6), a main catalyst layer (7), a supplementary ammonia injection grid (8) and a supplementary catalyst layer (9) in sequence along the flue gas flow direction. The main ammonia injection grid (5) includes multiple first ammonia injection branch pipes (501) arranged in parallel at equal intervals perpendicular to the flue gas flow direction. Each first ammonia injection branch pipe (501) has a row of first nozzles (502) and a row of second nozzles (503) arranged obliquely along its length. The first nozzles (502) and the second nozzles (503) are arranged alternately and have different orientations. Each of the first ammonia injection branch pipes (501) is connected to the ammonia supply pipe (504), and each of the first ammonia injection branch pipes (501) is equipped with an ammonia control valve (10).
2. The SCR denitrification system as described in claim 1, characterized in that, The first nozzle (502) and the second nozzle (503) are both provided with anti-clogging nozzles (506).
3. The SCR denitrification system as described in claim 1, characterized in that, The ammonia supply pipe (504) is provided with an air inlet (5041) and a mixed gas outlet (5042) at both ends. At least one mounting hole (5043) is also provided on the pipe wall of the ammonia supply pipe (504), and an ammonia gas supply pipe (505) is inserted through the mounting hole (5043). An air pipe is connected to the air inlet (5041), and the mixed gas outlet is connected to the first ammonia injection branch pipe (501).
4. The SCR denitrification system as described in claim 3, characterized in that, The ammonia gas supply pipe (505) is provided with multiple ammonia gas supply ports (5051).
5. The SCR denitrification system as described in claim 4, characterized in that, The supplementary ammonia injection grid (8) includes multiple parallel second ammonia injection branch pipes (801), each of which is provided with multiple third nozzles (802), which are arranged opposite to the flue gas flow direction.
6. The SCR denitrification system as described in claim 1, characterized in that, The ammonia-smoke turbulence diffuser (6) includes a base plate (601), on which a plurality of blade mounting holes (602) are provided. The plurality of blade mounting holes (602) are arranged at equal intervals along the longitudinal and transverse directions, and turbulence blades (603) are movably installed in the blade mounting holes (602).
7. The SCR denitrification system as described in claim 1, characterized in that, The SCR denitrification tower (1) has a flue gas inlet (101) at the top and a clean gas outlet (102) at the bottom; the interior space of the SCR denitrification tower (1) forms a reaction chamber (2). The reaction chamber (2) between the flue gas inlet and the flue guide plate (3) is a guide chamber (201), the reaction chamber (2) between the flue guide plate (3) and the flue gas premixer (4) is a premix chamber (202), the reaction chamber (2) between the flue gas premixer (4) and the main ammonia injection grid (5) is a main ammonia injection chamber (203), the reaction chamber (2) between the main ammonia injection grid (5) and the ammonia-smoke turbulence diffuser (6) is a turbulence chamber (204), the reaction chamber (2) between the ammonia-smoke turbulence diffuser (6) and the main catalyst layer (7) is a main catalyst chamber (205), and the reaction chamber (2) between the main catalyst layer (7) and the supplementary ammonia injection grid... The reaction chamber (2) between the grids (8) is a supplementary ammonia injection chamber (206), the reaction chamber (2) between the supplementary ammonia injection grid (8) and the supplementary catalyst layer (9) is a supplementary catalyst chamber (207), and the reaction chamber (2) between the supplementary catalyst layer (9) and the clean gas outlet is an outlet chamber (208); the flue gas inlet (101) is connected in sequence to the guide chamber (201), the premix chamber (202), the main ammonia injection chamber (203), the turbulence chamber (204), the main catalyst chamber (205), the supplementary ammonia injection chamber (206), the supplementary catalyst chamber (207), the outlet chamber (208), and the clean gas outlet (102).
8. The SCR denitrification system as described in claim 7, characterized in that, The flue gas inlet (101) is connected to an air inlet pipe (11), and the clean gas outlet (102) is connected to an air outlet pipe (12). NOx concentration detectors (13) are installed on the air inlet pipe (11), the supplementary ammonia injection chamber (206), and the air outlet pipe (12).
9. The SCR denitrification system as described in claim 8, characterized in that, An ammonia detector (14) is also installed on the gas outlet pipe (12).