Partition independent adjustable SCR precise ammonia injection branch control device

Abstract

This invention relates to the field of ammonia injection branch pipe control devices, and discloses a zone-independently adjustable SCR precision ammonia injection branch pipe control device, including a support assembly. The support assembly houses an ammonia distribution assembly, which comprises an ammonia inlet pipe, a first control valve, a primary ammonia distribution component, a secondary ammonia distribution component, a tertiary ammonia distribution component, a quaternary ammonia distribution component, and a touch screen. The first control valve is installed between the ammonia inlet pipe and the primary ammonia distribution component. Each pair of secondary ammonia distribution components is installed on top of the primary ammonia distribution component. This invention, through the combined arrangement of the primary, secondary, tertiary, and quaternary ammonia distribution components, can progressively and evenly distribute the medium in the ammonia inlet pipe, ensuring that the medium is sprayed out evenly during use of the ammonia injection branch pipe, thus facilitating the operation of this control device in the ammonia injection branch pipe.

Description

Technical Field

[0001] This invention relates to the field of ammonia injection branch pipe control device technology, specifically a zone-independently adjustable SCR precision ammonia injection branch pipe control device. Background Technology

[0002] Currently, the ammonia injection branch pipe is a core component of the flue gas selective catalytic reduction denitrification system and is part of the ammonia injection grid. It is mainly used to achieve uniform distribution and precise injection of the reducing agent on the flue cross section. At the same time, the control device connects the ammonia injection branch pipes in different zones to allow for independent and overall control of the medium flowing through the ammonia injection branch pipe.

[0003] In existing control devices, uneven flow of the medium into the ammonia injection branch pipes in different zones leads to uneven medium spraying from the nozzles on each ammonia injection branch pipe. As a result, the medium sprayed from the ammonia injection branch pipes has a poor denitrification effect on the flue gas in the flue and cannot meet the requirements for flue gas treatment. Therefore, this application proposes a new implementation scheme that is different from the structure of the ammonia injection branch pipe control device in the prior art. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a zone-independent adjustable SCR precision ammonia injection branch control device, mainly to solve the problem of uneven medium spraying from nozzles on different ammonia injection branch pipes in different zones.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: A zone-independent adjustable SCR precision ammonia injection branch control device includes a support assembly. The support assembly houses an ammonia distribution assembly, which consists of an ammonia inlet pipe, a first control valve, a primary ammonia distribution assembly, a secondary ammonia distribution assembly, a tertiary ammonia distribution assembly, a quaternary ammonia distribution assembly, and a touch screen. The first control valve is installed between the ammonia inlet pipe and the primary ammonia distribution assembly. Every two secondary ammonia distribution assemblies are installed on top of the primary ammonia distribution assembly, every two tertiary ammonia distribution assemblies are installed on top of the secondary ammonia distribution assembly, and the quaternary ammonia distribution assembly is installed on top of the tertiary ammonia distribution assembly. The touch screen is installed on one outer wall of the support assembly.

[0006] Furthermore, the support assembly includes a base plate, and a plurality of vertical plates are fixedly connected to the upper surface of the base plate. Each vertical plate is composed of two or more sub-plates, and two adjacent sub-plates in each vertical plate are fixedly connected to each other, and a clamping opening is provided between two adjacent sub-plates in each vertical plate.

[0007] Furthermore, the secondary ammonia separation component is located above the primary ammonia separation component. The primary ammonia separation component includes a primary main pipe, with a primary ammonia inlet at the bottom and two primary ammonia outlets at the top. The tops of the two primary ammonia outlets are respectively connected to a primary control component via connectors. First end caps are fixedly connected to both ends of the primary main pipe. A first arc block is integrally formed on the top of the inner surface of the primary main pipe, and the first arc block is located directly above the primary ammonia inlet.

[0008] Furthermore, the three-stage ammonia separation component is located above the two-stage ammonia separation component. The two-stage ammonia separation component includes a two-stage three-way pipe. The bottom of the two-stage three-way pipe is provided with a two-stage ammonia inlet. The two ends of the two-stage three-way pipe are respectively connected to two-stage bends through connectors. The tops of the two two-stage bends are respectively connected to a two-stage control component through connectors. A second arc block is integrally formed on the top of the inner surface of the two-stage bend, and the second arc block is located directly above the two-stage ammonia inlet.

[0009] Furthermore, the fourth-stage ammonia separation component is located above the third-stage ammonia separation component. The third-stage ammonia separation component includes a third-stage tee pipe, with a third-stage ammonia inlet at the bottom. Both ends of the third-stage tee pipe are connected to third-stage bend pipes via connectors. The tops of the two third-stage bend pipes are connected to a third-stage control component via connectors. A third arc block is integrally formed on the top of the inner surface of the third-stage bend pipe, and the third arc block is located directly above the third-stage ammonia inlet.

[0010] Furthermore, the four-stage ammonia separation assembly includes two four-stage main pipes, each with a four-stage ammonia inlet at its bottom and a four-stage ammonia outlet on one side of its outer wall. One end of each ammonia outlet is connected to a four-stage control assembly via a connector. A fourth arc block is integrally formed on the top of the inner surface of each of the two four-stage main pipes, and the fourth arc block is located directly above the four-stage ammonia inlet. A connecting seat is fixedly connected to one end of each of the two four-stage main pipes facing each other, and a fourth end cap is fixedly connected to the opposite ends of each of the two four-stage main pipes.

[0011] Furthermore, the primary main pipe, the secondary tee pipe, and the quaternary main pipe are clamped and fixed in the clamping openings of the corresponding vertical plates.

[0012] Furthermore, the first-level control component, the second-level control component, the third-level control component, and the fourth-level control component are all detection and adjustment components. The detection and adjustment components include a second control valve and a pipeline pressure gauge, and the second control valve and the pipeline pressure gauge are connected by a connector.

[0013] (III) Beneficial Effects Compared with the prior art, the present invention provides a zone-independently adjustable SCR precision ammonia injection branch control device, which has the following beneficial effects: 1. By combining a primary ammonia separation component, a secondary ammonia separation component, a tertiary ammonia separation component, and a quaternary ammonia separation component, the medium in the ammonia inlet pipe can be evenly distributed step by step, so that the medium can be sprayed out evenly when the ammonia injection branch pipe is in use, which facilitates the operation and use of this control device in the ammonia injection branch pipe.

[0014] 2. Through the design of built-in arc blocks at each level, the medium can be evenly divided and guided, effectively reducing the resistance to medium flow. This ensures that the mixed gas of ammonia and dilution air maintains a balanced flow rate during the step-by-step diversion process, ultimately ensuring the uniformity of the medium sprayed from the nozzles in each zone's ammonia injection branch pipe.

[0015] 3. By setting up detection and adjustment components consisting of an electrically controlled second control valve and an electronic pipeline pressure gauge between each level of ammonia separation components, the flow of media at each level can be dynamically detected and independently adjusted in real time. Operators can accurately control the flow of media in different zones of ammonia injection branches, achieving independent adjustment of zones. This effectively solves the problem of uneven flow of media in different zones of ammonia injection branches in existing technologies, and significantly improves the accuracy and adaptability of flue gas denitrification treatment.

[0016] 4. The tree-like modular design of the ammonia separation assembly allows for flexible configuration of the number of zones based on the number of four-stage ammonia separation components, providing excellent scalability and adapting to the ammonia injection grid layout requirements of flues of different sizes. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional view of the primary ammonia separation component of the present invention; Figure 3 This is a schematic cross-sectional view of the secondary ammonia separation component of the present invention; Figure 4 This is a cross-sectional view of the three-stage ammonia separation component of the present invention; Figure 5 This is a schematic cross-sectional view of the four-stage ammonia separation assembly of the present invention; Figure 6 This is a three-dimensional structural diagram of the detection and adjustment component of the present invention; Figure 7 This is a top view of the ammonia injection branch pipe partition structure of the present invention; Figure 8 This is a schematic diagram of the three-dimensional structure of the ammonia fractionation of the present invention; Figure 9 This is a three-dimensional structural diagram of the support component of the present invention.

[0018] In the diagram: 1. Support assembly; 101. Base plate; 102. Vertical plate; 103. Divider plate; 2. Ammonia separation assembly; 3. Ammonia inlet pipe; 4. First control valve; 5. Primary ammonia separation assembly; 501. Primary main pipe; 502. Primary ammonia inlet; 503. Primary ammonia outlet; 504. Primary control assembly; 505. First end cap; 506. First arc block; 6. Secondary ammonia separation assembly; 601. Secondary tee pipe; 602. Secondary ammonia inlet; 603. Secondary bend pipe; 604. Secondary control assembly; 605. Second arc block; 7. 701. Three-stage ammonia separation assembly; 702. Three-stage tee pipe; 703. Three-stage ammonia inlet; 704. Three-stage bend pipe; 705. Three-stage control assembly; 706. Third arc block; 8. Four-stage ammonia separation assembly; 807. Four-stage main pipe; 808. Four-stage ammonia inlet; 809. Four-stage ammonia outlet; 8000. Four-stage control assembly; 8001. Fourth arc block; 802. Connecting seat; 803. Fourth end cap; 9. Touch screen; 10. Detection and adjustment assembly; 1001. Second control valve; 1002. Pipeline pressure gauge; 11. Ammonia injection branch pipe. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Reference Figures 1-9 A zone-independent adjustable SCR precision ammonia injection branch pipe control device includes a support assembly 1, within which an ammonia distribution assembly 2 is installed. The ammonia distribution assembly 2 consists of an ammonia inlet pipe 3, a first control valve 4, a primary ammonia distribution component 5, a secondary ammonia distribution component 6, a tertiary ammonia distribution component 7, a quaternary ammonia distribution component 8, and a touch screen 9 with a built-in PLC controller. The first control valve 4 is installed between the ammonia inlet pipe 3 and the primary ammonia distribution component 5. Every two secondary ammonia distribution components 6 are installed on top of the primary ammonia distribution component 5, every two tertiary ammonia distribution components 7 are installed on top of the secondary ammonia distribution component 6, and the quaternary ammonia distribution component 8 is installed on top of the tertiary ammonia distribution component 7. The touch screen 9 is fixed to the outer wall of one side of the support assembly 1 by bolts. The primary ammonia distribution component 5, the secondary ammonia distribution component 6, the tertiary ammonia distribution component 7, and the quaternary ammonia distribution component 8 can distribute the medium in the ammonia inlet pipe 3 evenly in stages, so that the medium can be sprayed out evenly when the ammonia injection branch pipe 11 is in use, which facilitates the operation and use of this control device in the ammonia injection branch pipe 11. The primary ammonia separation component 5 includes a primary main pipe 501, with a primary ammonia inlet 502 at the bottom. A first control valve 4 is connected to the primary ammonia inlet 502 and the ammonia inlet pipe 3 via a connector. The primary main pipe 501 has two primary ammonia outlets 503 at the top, and the tops of the two primary ammonia outlets 503 are respectively connected to a primary control component 504 via connectors. The two ends of the primary main pipe 501 are respectively connected to a first end cap 505 via flanges. In this way, the primary ammonia separation component 5 can divide the medium flowing into the ammonia inlet pipe 3 into two parts. At the same time, the primary control component 504 can detect and control the two ends of the primary ammonia separation component 5 separately, and can perform real-time dynamic detection and adjustment of the medium flowing into the secondary ammonia separation component 6. A first arc block 506 is integrally formed on the top of the inner surface of the primary main pipe 501, and the first arc block 506 is located directly above the primary ammonia inlet 502. The secondary ammonia separation component 6 includes a secondary three-way pipe 601. The bottom of the secondary three-way pipe 601 is provided with a secondary ammonia inlet 602. The bottom end of the secondary ammonia inlet 602 is connected to the top of the corresponding primary control component 504 through a connector. The two ends of the secondary three-way pipe 601 are respectively connected to secondary bend pipes 603 through connectors. The top ends of the two secondary bend pipes 603 are respectively connected to the secondary control component 604 through connectors. In this way, the secondary ammonia separation component 6 can divide the medium flowing into the primary ammonia separation component 5 into two parts. At the same time, the secondary control component 604 can detect and control the two ends of the secondary ammonia separation component 6 separately. It can also perform real-time dynamic detection and adjustment of the medium flowing into the tertiary ammonia separation component 7 through the secondary control component 604. The top of the inner surface of the secondary bend pipe 603 is integrally formed with a second arc block 605, and the second arc block 605 is located directly above the secondary ammonia inlet 602. The three-stage ammonia separation component 7 includes a three-stage three-way pipe 701. The bottom of the three-stage three-way pipe 701 is provided with a three-stage ammonia inlet 702. The bottom end of the three-stage ammonia inlet 702 is connected to the top of the corresponding two-stage control component 604 through a connector. The two ends of the three-stage three-way pipe 701 are respectively connected to three-stage bend pipes 703 through connectors. The top ends of the two three-stage bend pipes 703 are respectively connected to the three-stage control component 704 through connectors. In this way, the three-stage ammonia separation component 7 can divide the medium flowing into the two-stage ammonia separation component 6 into two parts. At the same time, the three-stage control component 704 can detect and control the two ends of the three-stage ammonia separation component 7 separately. It can also perform real-time dynamic detection and adjustment of the medium flowing into the four-stage ammonia separation component 8 through the three-stage control component 704. The top of the inner surface of the three-stage bend pipe 703 is integrally formed with a third arc block 705, and the third arc block 705 is located directly above the three-stage ammonia inlet 702. The four-stage ammonia separation assembly 8 includes two four-stage main pipes 801, each with a four-stage ammonia inlet 802 at its bottom. The four-stage ammonia inlets 802 at the bottom of each of the two main pipes 801 are respectively connected to the top of the three-stage control assembly 704 in the same three-stage ammonia separation assembly 7 via connectors. Each of the two four-stage main pipes 801 has a four-stage ammonia outlet 803 on one side of its outer wall, and one end of each outlet 803 is connected to the four-stage control assembly 804 via a connector. A fourth arc block 80 is integrally formed on the top of the inner surface of each of the two four-stage main pipes 801. 5. The fourth arc block 805 is located directly above the fourth-stage ammonia inlet 802. The two fourth-stage main pipes 801 are connected to the connecting seat 806 at opposite ends via flanges, and the two fourth-stage main pipes 801 are connected to the fourth end cap 807 at opposite ends via flanges. The fourth-stage ammonia separation component 8 can divide the medium flowing into the third-stage ammonia separation component 7 into two parts. The fourth-stage control component 804 can detect and control the two ends of the fourth-stage ammonia separation component 8 separately, and can perform real-time dynamic detection and adjustment of the medium flowing into the ammonia injection branch pipe 11 from the fourth-stage control component 804. Among them, the first arc block 506, the second arc block 605, the third arc block 705, and the fourth arc block 805 are all triangular structures with double opposing arc surfaces, which can uniformly divide and guide the medium entering the primary main pipe 501, the secondary tee pipe 601, the tertiary tee pipe 701, and the quaternary main pipe 801, thereby reducing the resistance to medium flow and facilitating the flow and use of the medium in the ammonia separation assembly 2. When this control device is in use, each ammonia injection branch pipe 11 is installed at one end of the corresponding fourth-level control component 804 through a connector. When the medium flows through the ammonia separation assembly 2, the medium entering the ammonia inlet pipe 3 is first evenly controlled by the first-level control component 504 so that it enters the second-level ammonia separation component 6. Then, the medium is evenly distributed by the second-level control component 604, the third-level control component 704, and the fourth-level control component 804 in sequence. The evenly distributed medium flows into the corresponding ammonia injection branch pipe 11, ensuring the uniformity of the medium sprayed from the nozzles in the ammonia injection branch pipe 11 in each zone, and ensuring the practicality of this control device in controlling the ammonia injection branch pipe 11. The support assembly 1 includes a base plate 101. Multiple vertical plates 102 are fixed to the upper surface of the base plate 101 by bolts. Each vertical plate 102 is composed of two or more sub-plates 103. Two adjacent sub-plates 103 in each vertical plate 102 are fixedly connected by bolts. A clamp is provided between two adjacent sub-plates 103 in each vertical plate 102. The inner surface of the clamp is covered with an anti-slip rubber pad. The corresponding primary main pipe 501, secondary tee pipe 601 and quaternary main pipe 801 are respectively clamped and fixed in the clamp of the corresponding vertical plate 102. The first-level control component 504, the second-level control component 604, the third-level control component 704 and the fourth-level control component 804 are all detection and regulation components 10. The detection and regulation component 10 includes a second control valve 1001 and a pipeline pressure gauge 1002, and the second control valve 1001 and the pipeline pressure gauge 1002 are connected by a connector. Among them, the second control valve 1001 and the first control valve 4 are both electrically controlled valve bodies, the pipeline pressure gauge 1002 is an electronic pressure gauge, and the second control valve 1001, the first control valve 4 and the pipeline pressure gauge 1002 are all electrically connected to the PLC controller. Operators can operate them through the touch screen 9, which facilitates the detection and control of the medium flow in the ammonia separation assembly 2. Meanwhile, the number of zones in this control device is the same as the number of four-stage ammonia separation components 8, and the position of each zone corresponds to the position of each four-stage ammonia separation component 8 and its connecting ammonia injection branch pipe 11. Thus, this control device contains one primary ammonia separation component 5, two secondary ammonia separation components 6, four tertiary ammonia separation components 7 and four quaternary ammonia separation components 8. The primary ammonia separation component 5, secondary ammonia separation component 6, tertiary ammonia separation component 7 and quaternary ammonia separation component 8 are connected in sequence, so that the ammonia separation assembly 2 has an evenly divided tree structure, ensuring the precise control and use of each ammonia injection branch pipe 11 in different zones by this control device; In this control device, sealing rings are installed at the connection points between each structure to ensure the overall sealing of the ammonia assembly 2 and to prevent leakage when the medium flows in the ammonia assembly 2. The medium circulating in this control device is a mixture of ammonia gas and diluted air, which is uniformly injected to mix NH3 and NO. x Ensure adequate contact in front of the catalyst layer.

[0021] The working principle of this embodiment is as follows: When in use, the operator first installs the control device on the outside of the flue. The support component 1 is installed on the ground. The ammonia inlet pipe 3 in the ammonia distribution assembly 2 is connected to the medium inlet pipe through a centrifugal high-temperature corrosion-resistant fan. Then, the ammonia injection branch pipe 11 is installed in the ammonia injection grid of the flue. Finally, the power supply of the control device is turned on. In this way, the installation and use of the control device is completed. When using this control device, such as Figure 7 The number of partitions in this control device is the number of four-stage ammonia separation components 8, with a total of four partitions. The position of each partition corresponds to the position of each four-stage ammonia separation component 8 and its connecting ammonia injection branch pipe 11. The operator first injects the medium into the ammonia separation assembly 2 through a centrifugal high-temperature corrosion-resistant fan, and finally enters the ammonia injection branch pipe 11, and sprays it out from the nozzle to treat the flue gas in the flue. When the medium enters the ammonia inlet pipe 3, the operator first opens the first control valve 4. Then, the medium enters the primary ammonia separation component 5, which divides the medium flowing into the ammonia inlet pipe 3 into two equal parts. Simultaneously, the primary control component 504 can separately detect and control both ends of the primary ammonia separation component 5, allowing for real-time dynamic detection and adjustment of the medium flowing into the secondary ammonia separation component 6. Then, the medium enters the secondary ammonia separation component 6, which divides the medium flowing into the primary ammonia separation component 5 into two equal parts. Simultaneously, the secondary control component 604 can separately detect and control both ends of the secondary ammonia separation component 6, allowing for real-time dynamic detection and adjustment of the medium flowing into the tertiary ammonia separation component 7. Then, the medium enters the three-stage ammonia separation component 7, which divides the medium flowing into the two-stage ammonia separation component 6 into two parts. At the same time, the three-stage control component 704 can detect and control both ends of the three-stage ammonia separation component 7 separately, and can perform real-time dynamic detection and adjustment of the medium flowing into the four-stage ammonia separation component 8. Finally, the medium enters the four-stage ammonia separation component 8, which divides the medium flowing into the three-stage ammonia separation component 7 into two parts. The four-stage control component 804 can detect and control both ends of the four-stage ammonia separation component 8 separately, and can perform real-time dynamic detection and adjustment of the medium flowing into the ammonia injection branch pipe 11. In this way, the control device completes the control of each ammonia injection branch pipe 11 in each zone.

[0022] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power, and the main controller can be a conventional known device such as a computer that can control it.

[0023] In the description herein, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A zone-independent adjustable SCR precision ammonia injection branch control device, comprising a support assembly (1), characterized in that, The support assembly (1) is equipped with an ammonia separation assembly (2), which consists of an ammonia inlet pipe (3), a first control valve (4), a first-stage ammonia separation component (5), a second-stage ammonia separation component (6), a third-stage ammonia separation component (7), a fourth-stage ammonia separation component (8), and a touch screen (9). The first control valve (4) is installed between the ammonia inlet pipe (3) and the first-stage ammonia separation component (5). Every two second-stage ammonia separation components (6) are installed on the top of the first-stage ammonia separation component (5), every two third-stage ammonia separation components (7) are installed on the top of the second-stage ammonia separation component (6), and the fourth-stage ammonia separation component (8) is installed on the top of the third-stage ammonia separation component (7). The touch screen (9) is installed on one side of the outer wall of the support assembly (1).

2. The SCR precision ammonia injection branch control device with independent adjustable zone as described in claim 1, characterized in that: The support assembly (1) includes a base plate (101), and a plurality of vertical plates (102) are fixedly connected to the upper surface of the base plate (101). Each vertical plate (102) is composed of two or more sub-plates (103). Two adjacent sub-plates (103) in each vertical plate (102) are fixedly connected, and a clamping opening is provided between two adjacent sub-plates (103) in each vertical plate (102).

3. The SCR precision ammonia injection branch control device with independent adjustable zones according to claim 2, characterized in that: The secondary ammonia separation component (6) is located above the primary ammonia separation component (5). The primary ammonia separation component (5) includes a primary main pipe (501), a primary ammonia inlet (502) at the bottom of the primary main pipe (501), and two primary ammonia outlets (503) at the top of the primary main pipe (501). The tops of the two primary ammonia outlets (503) are respectively connected to a primary control component (504) via connectors. The two ends of the primary main pipe (501) are respectively fixedly connected to a first end cap (505). A first arc block (506) is integrally formed on the top of the inner surface of the primary main pipe (501), and the first arc block (506) is located directly above the primary ammonia inlet (502).

4. The SCR precision ammonia injection branch control device with independent adjustable zone as described in claim 3, characterized in that: The three-stage ammonia separation component (7) is located above the two-stage ammonia separation component (6). The two-stage ammonia separation component (6) includes a two-stage three-way pipe (601). The bottom of the two-stage three-way pipe (601) is provided with a two-stage ammonia inlet (602). The two ends of the two-stage three-way pipe (601) are respectively connected to two-stage bend pipes (603) through connectors. The top ends of the two two-stage bend pipes (603) are respectively connected to two-stage control components (604) through connectors. The top of the inner surface of the two-stage bend pipe (603) is integrally formed with a second arc block (605), and the second arc block (605) is located directly above the two-stage ammonia inlet (602).

5. The SCR precision ammonia injection branch control device with independent adjustable zone as described in claim 4, characterized in that: The fourth-stage ammonia separation component (8) is located above the third-stage ammonia separation component (7). The third-stage ammonia separation component (7) includes a third-stage three-way pipe (701). The bottom of the third-stage three-way pipe (701) is provided with a third-stage ammonia inlet (702). The two ends of the third-stage three-way pipe (701) are respectively connected to a third-stage bend pipe (703) through a connector. The top ends of the two third-stage bend pipes (703) are respectively connected to a third-stage control component (704) through a connector. A third arc block (705) is integrally formed on the top of the inner surface of the third-stage bend pipe (703), and the third arc block (705) is located directly above the third-stage ammonia inlet (702).

6. The SCR precision ammonia injection branch control device with independent adjustable zone as described in claim 5, characterized in that: The four-stage ammonia separation assembly (8) includes two four-stage main pipes (801), each with a four-stage ammonia inlet (802) at its bottom. Each of the two four-stage main pipes (801) has a four-stage ammonia outlet (803) on one side of its outer wall. One end of each four-stage ammonia outlet (803) is connected to a four-stage control assembly (804) via a connector. The top of the inner surface of each of the two four-stage main pipes (801) is integrally formed with a fourth arc block (805), which is located directly above the four-stage ammonia inlet (802). A connecting seat (806) is fixedly connected to one end of each of the two four-stage main pipes (801), and a fourth end cap (807) is fixedly connected to the opposite ends of each of the two four-stage main pipes (801).

7. The SCR precision ammonia injection branch control device with independent adjustable zone as described in claim 6, characterized in that: The primary main pipe (501), the secondary tee pipe (601), and the quaternary main pipe (801) are clamped and fixed in the clamping openings of the corresponding vertical plates (102).

8. The SCR precision ammonia injection branch control device with independent adjustable zone as described in claim 6, characterized in that: The first-level control component (504), the second-level control component (604), the third-level control component (704) and the fourth-level control component (804) are all detection and regulation components (10). The detection and regulation component (10) includes a second control valve (1001) and a pipeline pressure gauge (1002), and the second control valve (1001) and the pipeline pressure gauge (1002) are fixedly connected.

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