An ammonia injection device for coal-fired power plants

Abstract

The utility model provides a kind of for coal-fired power plant's ammonia injection device, specifically related to ammonia injection technical field, and the import pipeline connected with ammonia-air mixer outlet and the export pipeline connected with ammonia nozzle, still include the first baffle pipe and the second baffle pipe of parallel arrangement;The two ends of first baffle pipe, second baffle pipe meet after convergence, respectively with import pipeline, export pipeline link;First baffle pipe, second baffle pipe are respectively equipped with several baffle and interval frame in;Wherein the edge of baffle is equipped with baffle hole;Interval frame is equipped between two adjacent baffles;And the baffle hole of two adjacent baffles is symmetrically arranged in center;First limiting device and second limiting device for limiting baffle are respectively equipped in the inner ring of the two ends of first baffle pipe, second baffle pipe, wherein second limiting device is detachably connected.This device not only can improve ammonia and air mixing uniformity, and can improve device applicability convenience, reliability.

Description

Technical Field

[0001] This utility model belongs to the field of ammonia injection technology, specifically relating to an ammonia injection device for coal-fired power plants. Background Technology

[0002] To reduce emissions of sulfur oxides and nitrogen oxides, coal-fired power plants mainly adopt desulfurization and denitrification technologies. Ammonia injection, as an important process in desulfurization and denitrification technologies, uses ammonia as an absorbent to remove pollutants from flue gas.

[0003] Existing ammonia injection devices generally include: an ammonia storage tank, an atomizer, an ammonia-air mixer, and nozzles. The ammonia injection process is as follows: ammonia gas is output from the ammonia storage tank, then atomized by the atomizer, then mixed with air by the ammonia-air mixer, and finally sprayed out through the nozzles. However, in existing technologies, the ammonia and air are mixed and then directly sprayed out through the nozzles. Due to the limited contact time between ammonia and air, the uniformity of the mixture needs to be improved.

[0004] Patent CN220918714U discloses an SCR denitrification ammonia injection device. An ammonia injection main pipe is fixedly connected to one side of the device body, and a nitrogen oxide delivery pipe is fixedly connected to the top of the device body. The nitrogen oxide delivery pipe is the denitrification section. A treatment box is fixedly connected to the end of the nitrogen oxide delivery pipe away from the device body. A fixing port is opened at the bottom of one side of the outer wall of the treatment box, and the inner wall of the fixing port is fixedly connected to the nitrogen oxide delivery pipe. This device can treat the detected gas to achieve environmental protection; however, it still improves the uniformity of ammonia and air mixing.

[0005] To address the above shortcomings, there is a need for an ammonia injection device for coal-fired power plants that can not only improve the uniformity of ammonia and air mixing, but also enhance the device's ease of use and reliability. Utility Model Content

[0006] The purpose of this invention is to provide an ammonia injection device for coal-fired power plants, which can not only improve the uniformity of ammonia and air mixing, but also improve the device's applicability and reliability.

[0007] This utility model provides the following technical solution:

[0008] An ammonia injection device for a coal-fired power plant, comprising an inlet pipe connected to the outlet of an ammonia-air mixer and an outlet pipe connected to an ammonia nozzle, characterized in that: it further includes a first baffle pipe and a second baffle pipe arranged in parallel; the two ends of the first baffle pipe and the second baffle pipe converge and are respectively connected to the inlet pipe and the outlet pipe; the first baffle pipe and the second baffle pipe are respectively provided with a plurality of baffle plates and a spacer frame;

[0009] The baffle plate has baffle holes on its edge; the spacer frame is located between two adjacent baffle plates; and the baffle holes of two adjacent baffle plates are arranged in a centrally symmetrical manner.

[0010] The inner rings at both ends of the first and second baffle pipes are respectively provided with a first limiting device and a second limiting device for limiting the baffle plates, wherein the second limiting device is a detachable connection;

[0011] Preferably, the inlet pipe and the outlet pipe are herringbone-shaped pipes; the first deflector pipe and the second deflector pipe are straight pipes arranged in parallel; the two ends of the first deflector pipe and the second deflector pipe are respectively connected to the herringbone-shaped branch pipes of the inlet pipe and the outlet pipe through flange faces;

[0012] Preferably, valves are installed on the branch pipes of the herringbone pipes for both the inlet and outlet pipes;

[0013] Preferably, the first limiting device is annular, and the first limiting device is welded to the inner ring of the first baffle pipe and the second baffle pipe respectively;

[0014] Preferably, the first baffle pipe and the second baffle pipe are provided with guide protrusions on both sides; the baffle plate is provided with guide grooves on both sides that match the guide protrusions;

[0015] Preferably, the second limiting device includes a limiting flange and a limiting flange neck; the limiting flange neck is located inside the first baffle pipe and the second baffle pipe; one end of the limiting flange neck abuts and limits the baffle plate or spacer frame, and the other end of the limiting flange neck is connected to the limiting flange; and the limiting flange is located between the flange connection surfaces of the first baffle pipe, the second baffle pipe and the inlet pipe respectively; gaps are provided on both sides of the limiting flange neck, and the gap width is greater than the width of the guide protrusion;

[0016] Preferably, the spacer frame includes two triangular stabilizing rods, four arc-shaped rods, and three connecting rods; the vertices of the triangular stabilizing rods are respectively connected to the two arc-shaped rods; the two ends of the connecting rods are respectively connected to the three vertices of the triangular stabilizing rods; the two triangular stabilizing rods are connected in series; and the gap width between two adjacent arc-shaped rods is greater than the width of the guide protrusion.

[0017] Preferably, the side of the baffle is provided with a hook ring for hooking.

[0018] The beneficial effects of this utility model are:

[0019] 1. This device uses freely detachable baffles to deflect the mixed ammonia and air, thereby increasing the contact time between ammonia and air and thus improving the mixing uniformity. The number of baffles can be freely combined to meet different deflection requirements and improve convenience.

[0020] 2. This device adopts dual-pipeline operation and can be independently controlled to open and close. Even if one pipeline fails or is under maintenance, it can still operate normally through the other pipeline, ensuring the reliability of the device. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a diagram showing the overall structure of the device;

[0023] Figure 2 This is a cross-sectional view of the device;

[0024] Figure 3 This is an exploded view of the device;

[0025] Figure 4 This is a partial structural diagram of the device;

[0026] The following are labeled in the diagram: 1. First baffle pipe; 2. Second baffle pipe; 3. Inlet pipe; 4. Outlet pipe; 5. Baffle plate; 6. Baffle orifice; 7. Guide groove; 8. Hook ring; 9. Spacer frame; 10. Arc rod; 11. Stabilizing rod; 12. Connecting rod; 13. First limiting device; 14. Second limiting device; 15. Limiting flange; 16. Limiting flange neck; 17. Guide protrusion; 18. Valve. Detailed Implementation

[0027] Example 1:

[0028] like Figures 1 to 4 A prior art ammonia injection device for a coal-fired power plant includes an inlet pipe 3 connected to the outlet of an ammonia-air mixer and an outlet pipe 4 connected to an ammonia nozzle. The pipe connections can be made using flange connections or other reliable existing structures. A first baffle pipe 1 and a second baffle pipe 2 are arranged in parallel. The two ends of the first baffle pipe 1 and the second baffle pipe 2 converge and connect to the inlet pipe 3 and the outlet pipe 4, respectively. For the above connection structure, see [reference needed]. Figure 1 The inlet pipe 3 and outlet pipe 4 are herringbone shaped pipes. To facilitate connection, a straight section of pipe is provided for each branch pipe of the inlet pipe 3 and outlet pipe 4. The pipe structures of the inlet pipe 3 and outlet pipe 4 are achieved by welding. The first deflector pipe 1 and the second deflector pipe 2 are straight pipes arranged in parallel. The two ends of the first deflector pipe 1 and the second deflector pipe 2 are connected to the herringbone branch pipes of the inlet pipe 3 and outlet pipe 4 respectively through flange faces. To improve the airtightness of the connection, a sealing gasket can be added at the connection.

[0029] To ensure independent control of the pipelines, allowing normal operation through another pipeline even if one pipeline fails or requires maintenance, thus guaranteeing the reliability of the system, four valves 18 are installed on the branch pipes of the herringbone-shaped pipelines of inlet pipe 3 and outlet pipe 4. These valves are located on the four branch pipes of inlet pipe 3 and outlet pipe 4, respectively. See details... Figure 1 and Figure 2 The type of valve 18 can be selected according to actual needs, such as ball valve, butterfly valve or other suitable types of valve. The connection between valve 18 and pipeline can adopt the existing connection structure, such as flange connection.

[0030] like Figure 2 and Figure 3 To achieve flow deflection, several deflector plates 5 and spacer frames 9 are respectively installed in the first deflector pipe 1 and the second deflector pipe 2. The spacer frame 9 includes two triangular stabilizing rods 11, four arc-shaped rods 10, and three connecting rods 12. The vertices of the triangular stabilizing rods 11 are respectively connected to the two arc-shaped rods 10. The two ends of the connecting rods 12 are respectively connected to the three vertices of the triangular stabilizing rods 11, connecting the two triangular stabilizing rods 11 in series. The spacer frame 9 can be directly connected by welding. The use of triangular stabilizing rods 11 is not only stable, but also, compared with square materials, the arc structure can maximize the support area.

[0031] The baffle plate 5 has baffle holes 6 on its edge. The shape of the baffle holes 6 can be elliptical, circular, or semi-circular, depending on the actual situation. The spacer frame 9 is set between two adjacent baffle plates 5 to limit and separate the baffle plates 5. The baffle holes 6 of two adjacent baffle plates 5 are arranged in a centrally symmetrical manner, that is, the baffle holes 6 are located in opposite positions in the pipe. The ammonia-air mixture fluid travels in an S-path through the baffle holes 6, which increases the contact time and thus helps to improve the mixing uniformity. Of course, according to actual needs, the baffle holes 6 can also be arranged in a clockwise or counterclockwise manner to achieve the vortex-like movement of the fluid.

[0032] like Figures 2 to 4Meanwhile, in order to ensure the stability of the baffle plate 6 and the spacer frame 9, a first limiting device 13 and a second limiting device 14 for limiting the baffle plate 5 are respectively provided on the inner rings of the first baffle pipe 1 and the second baffle pipe 2. The second limiting device 13 is a detachable connection. Specifically, the first limiting device 13 is annular, and its outer diameter matches the inner diameter of the first baffle pipe 1 and the second baffle pipe 2. The first limiting device 13 is welded to the inner rings of the first baffle pipe 1 and the second baffle pipe 2 respectively. The second limiting device 14 includes a limiting flange 15 and a limiting flange neck 16; the limiting flange neck 16 is located inside the first baffle pipe 1 and the second baffle pipe 2; that is, the limiting flange neck 16 can be embedded inside the first baffle pipe 1 and the second baffle pipe 2 and abut against the end of the baffle plate 5 or the spacer frame 9; the other end of the limiting flange neck 16 is connected to the limiting flange 16; and the limiting flange 15 is located between the flange connection surfaces of the first baffle pipe 1, the second baffle pipe 2 and the inlet pipe 3, that is, the limiting flange 15 and the limiting flange neck 16 are integrated. The limiting flange 15 is clamped between the flange connection surfaces of the first baffle pipe 1, the second baffle pipe 2, and the inlet pipe 3; this allows for the disassembly and assembly of the second limiting device 14 and enables it to perform its limiting function; in practical applications, different numbers of baffle plates 5 and spacer frames 9 can be stacked to meet the baffle requirements of different paths and improve convenience; the limiting flange neck 16 of different lengths can be selected according to actual needs; of course, a straight pipe can also be added directly, with the limiting flange neck 16 abutting against the end of the straight pipe to increase the length of the limiting flange neck 16.

[0033] In practical applications, to reduce equipment costs, a uniform length of limiting flange neck 16 can be used to stack multiple baffles 5 in sequence, that is, the baffles 5 directly align the baffle holes 6, and then be limited by the spacer frame 9. In this way, the total length will not change, and the baffle length can also be changed without the need to replace the limiting flange neck 16 of different lengths.

[0034] Example 2:

[0035] Based on Embodiment 1, guide protrusions 17 are provided on both sides of the first baffle pipe 1 and the second baffle pipe 2; guide grooves 7 matching the guide protrusions 17 are provided on both sides of the baffle plate 5; although the guide protrusions 1 and guide grooves 7 can improve the stability of the baffle plate 5, the diversity of the position of the baffle hole 6 is limited. Therefore, in order to make the position of the baffle hole 6 more diverse, baffle plates 5 with different positions of the baffle hole 6 can be used to meet the diverse needs; in order to allow the limiting flange neck 16 to be properly embedded in the first baffle pipe 1 and the second baffle pipe 2, gaps are provided on both sides of the limiting flange neck 16, and the gap width is greater than the width of the guide protrusion 17; in order to allow the spacer frame 9 to be properly embedded in the first baffle pipe 1 and the second baffle pipe 2, the gap width between two adjacent arc rods 10 is greater than the width of the guide protrusion 17.

[0036] In practical applications, factors to be considered include the placement and removal of the baffle plate 5, corrosion prevention, etc. These factors can be easily solved using existing technologies. To enable those skilled in the art to diversify the application of this technology, the following examples are provided: When placing and removing the baffle plate 5, hooks can be used. Hooks are installed on the metal rod, and hook rings 8 are provided on the side of the baffle plate 5 for hooking. The hooks can be directly hooked onto the hook rings 8, and the baffle plate 5 can be pulled out to achieve disassembly and assembly. The partition frame 9 can also be used in a similar manner, or other existing technologies can be used. To reduce friction and improve corrosion resistance, the first baffle pipe 1 and the second baffle pipe 2 can be fully covered with polytetrafluoroethylene (PTFE), and the surface of the baffle plate 5 can also be covered with PTFE. The above are merely preferred examples for better implementation of this technology.

[0037] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An ammonia injection device for a coal-fired power plant, comprising an inlet pipe connected to the outlet of an ammonia-air mixer and an outlet pipe connected to an ammonia nozzle, characterized in that: It also includes a first baffle pipe and a second baffle pipe arranged in parallel; after the two ends of the first baffle pipe and the second baffle pipe meet, they are connected to the inlet pipe and the outlet pipe, respectively; the first baffle pipe and the second baffle pipe are respectively provided with several baffle plates and partition frames; The baffle plate has baffle holes on its edge; the spacer frame is located between two adjacent baffle plates; and the baffle holes of two adjacent baffle plates are arranged in a centrally symmetrical manner. The inner rings at both ends of the first and second baffle pipes are respectively provided with a first limiting device and a second limiting device for limiting the baffle plates, wherein the second limiting device is a detachable connection.

2. The ammonia injection device for a coal-fired power plant according to claim 1, characterized in that: The inlet and outlet pipelines are in a herringbone shape.

3. An ammonia injection device for a coal-fired power plant according to claim 2, characterized in that: The first and second deflector pipes are straight pipes arranged in parallel; the two ends of the first and second deflector pipes are connected to the inlet and outlet pipes respectively via flanges.

4. An ammonia injection device for a coal-fired power plant according to claim 3, characterized in that: Valves are installed on the branches of the herringbone-shaped pipes for both the inlet and outlet pipelines.

5. An ammonia injection device for a coal-fired power plant according to claim 1, characterized in that: The first limiting device is annular, and is welded to the inner rings of the first baffle pipe and the second baffle pipe respectively.

6. An ammonia injection device for a coal-fired power plant according to claim 5, characterized in that: The first and second baffle pipes are respectively provided with guide protrusions on both sides; the baffle plates are provided with guide grooves on both sides that match the guide protrusions.

7. An ammonia injection device for a coal-fired power plant according to claim 6, characterized in that: The second limiting device includes a limiting flange and a limiting flange neck; the limiting flange neck is located inside the first baffle pipe and the second baffle pipe; one end of the limiting flange neck abuts against and limits the baffle plate or spacer frame, and the other end of the limiting flange neck is connected to the limiting flange; and the limiting flange is located between the flange connection surfaces of the first baffle pipe, the second baffle pipe and the inlet pipe respectively.

8. An ammonia injection device for a coal-fired power plant according to claim 7, characterized in that: The limiting flange neck has gaps on both sides, and the gap width is greater than the guide protrusion width.

9. An ammonia injection device for a coal-fired power plant according to claim 8, characterized in that: The spacer frame includes two triangular stabilizing rods, four arc-shaped rods, and three connecting rods; the vertices of the triangular stabilizing rods are connected to the two arc-shaped rods respectively; the two ends of the connecting rods are connected to the three vertices of the triangular stabilizing rods respectively; the two triangular stabilizing rods are connected in series; and the gap width between two adjacent arc-shaped rods is greater than the width of the guide protrusion.

10. An ammonia injection device for a coal-fired power plant according to claim 1, characterized in that: The sides of the baffle are equipped with hooks for hooking.

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