Flue gas denitration ammonia injection grid device

Abstract

The utility model discloses a flue gas denitration ammonia spraying grating device which comprises an ammonia gas inlet pipe, the ammonia gas inlet pipe is transversely fixed in a flue gas pipe, an n-shaped pipe is fixed in the middle of the ammonia gas inlet pipe, a plurality of uniform dispersing pipes are fixed on two sides of the ammonia gas inlet pipe, one end of each uniform dispersing pipe is communicated with the ammonia gas inlet pipe, the other end of each uniform dispersing pipe is fixed on the inner wall of the flue gas pipe, and a plurality of uniform dispersing holes are formed in each uniform dispersing pipe. A plurality of turbulent flow nozzles are further arranged on the uniform dispersing pipe; the ammonia gas inlet pipe is arranged, the uniform dispersing pipes are arranged on the two sides of the ammonia gas inlet pipe, ammonia gas is uniformly dispersed and conveyed to the two sides in the whole ammonia gas inlet pipe, the conveying uniformity of the ammonia gas to the uniform dispersing pipes on the two sides is improved, in addition, the n-shaped pipe is arranged on the ammonia gas inlet pipe, the input amount of the ammonia gas in the uniform dispersing pipes on the two sides of the rear end of the ammonia gas inlet pipe is guaranteed, and the ammonia gas conveying efficiency is improved. And the problem that the ammonia input quantity on the uniform dispersing pipe on the rear side is reduced due to the shunting of the uniform dispersing pipe at the front end at the rear end of the ammonia inlet pipe is avoided, so that the uniformity of the ammonia in the uniform dispersing pipe is improved, the dispersing uniformity of the ammonia is improved, and the deamination effect of flue gas is improved.

Description

Technical Field

[0001] This utility model belongs to the field of flue gas denitrification technology, and in particular relates to a flue gas denitrification ammonia injection grid device. Background Technology

[0002] The flue gas denitrification ammonia injection grid device is used in flue gas denitrification pipelines and is a core component of the SCR (Selective Catalytic Reduction) denitrification system. It is used to inject ammonia into the flue gas for denitrification, and its design directly affects the mixing uniformity of ammonia and flue gas and the denitrification efficiency.

[0003] Regarding flue gas denitrification ammonia injection grid devices, a search reveals that a utility model patent with Chinese patent authorization announcement number CN215996177U discloses a flue gas denitrification ammonia injection grid device, such as... Figure 1 As shown, it mainly includes a frame a, which is fixedly installed on the inner wall of the flue; the frame a is a rectangular frame structure, and vertical rods b and horizontal rods c are provided inside the frame a. The frame a, vertical rods b and horizontal rods c are connected internally. Multiple nozzles d are provided on the frame a and vertical rods b. Two air inlet pipes e are provided on one side of the frame a. The two air inlet pipes e are connected to the ammonia inlet pipe f through a tee g.

[0004] In the existing technology, similar flue gas denitrification ammonia injection grid devices have been found to have areas for improvement during actual implementation: when the ammonia inlet pipe is located on one side of the frame, the distribution of ammonia in the vertical and horizontal pipes of the frame is uneven at positions far from the ammonia inlet pipe, affecting the uniformity of ammonia injection. Utility Model Content

[0005] In view of the shortcomings and defects in the existing technology, the purpose of this utility model is to provide a flue gas denitrification ammonia injection grid device, which solves the problem of uneven ammonia distribution in the existing flue gas denitrification ammonia injection grid device, which affects the uniformity of ammonia injection.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a flue gas denitrification ammonia injection grid device, which is installed inside a flue pipe, including an ammonia inlet pipe, which is horizontally fixed inside the flue pipe and has one end extending out of the flue pipe. An n-shaped tube is fixed in the middle of the ammonia inlet pipe and is connected to the ammonia inlet pipe. Multiple equalization tubes are fixed on both sides of the ammonia inlet pipe. The outer edge of the multiple equalization tubes at the end away from the ammonia inlet pipe is arc-shaped and matches the inner wall of the flue pipe. A blockage is provided on the side of the equalization tube away from the ammonia inlet pipe. One end of the equalization tube is connected to the ammonia inlet pipe and the other end is fixed to the inner wall of the flue pipe. The equalization tube is provided with multiple equalization holes and multiple turbulence nozzles. A baffle is provided at both interface positions of the n-shaped tube and the ammonia inlet pipe. The baffle is located on the side near the middle of the ammonia inlet pipe.

[0007] As a further improvement of this utility model, a connecting rod is fixed on the equalization pipes on both sides of the ammonia inlet pipe.

[0008] As a further improvement of this utility model, the ammonia inlet pipe is provided with a filter screen on the side near the ammonia inlet direction.

[0009] As a further improvement of this utility model, the length of the n-shaped tube is the same as one-third of the length of the ammonia inlet pipe.

[0010] As a further improvement of this utility model, the two baffles are tilted toward the side away from the middle of the ammonia inlet pipe.

[0011] As a further improvement of this utility model, a turbulence strip is provided on the n-shaped tube or the uniform distribution tube.

[0012] Compared with the prior art, this utility model has the following advantages:

[0013] 1. By setting up an ammonia inlet pipe and installing equalization pipes on both sides of the ammonia inlet pipe, ammonia is first introduced into the ammonia inlet pipe, filling the entire pipe. The ammonia is then evenly distributed to both sides, improving the uniformity of ammonia delivery to the equalization pipes. Furthermore, by installing an n-shaped pipe on the ammonia inlet pipe, some ammonia can pass through the n-shaped pipe before entering the rear end of the ammonia inlet pipe during delivery. This ensures a consistent ammonia input to the equalization pipes on both sides of the rear end of the ammonia inlet pipe, preventing a reduction in ammonia input to the rear equalization pipes due to diversion by the front equalization pipe. This improves the uniformity of ammonia distribution within the equalization pipes, enhances the uniformity of ammonia mixing with flue gas, and ultimately improves the ammonia removal effect of the flue gas.

[0014] The baffle installed inside the ammonia inlet pipe has a certain guiding effect. The front baffle facilitates the input of ammonia into the n-shaped pipe, while the rear baffle facilitates the transmission of ammonia to the rear end of the ammonia inlet pipe.

[0015] 2. The stability of the uniform distribution pipe is improved by fixing a connecting rod on each side of the ammonia inlet pipe.

[0016] 3. By installing a filter screen on the side of the ammonia inlet pipe closer to the ammonia inlet direction, the purity of ammonia can be improved and impurities in the ammonia output can be reduced.

[0017] 4. By setting up turbulence strips, the output ammonia gas is turbulent, which improves the diffusion of ammonia gas and thus improves the uniform dispersion of ammonia gas, so as to ensure uniform mixing of ammonia gas and flue gas. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of the existing technology;

[0020] Figure 2 This is a schematic diagram of the structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the ammonia inlet pipe and the n-shaped pipe.

[0022] In the diagram: 1. Ammonia inlet pipe; 2. N-shaped pipe; 3. Distribution pipe; 4. Distribution orifice; 5. Baffle nozzle; 6. Baffle; 7. Connecting rod; 8. Filter screen; 9. Baffle strip. Detailed Implementation

[0023] The following is in conjunction with the appendix Figure 2-3 The present invention will be described in further detail below. For clarity, only the structures relevant to the inventive features of the present invention are shown in the figures.

[0024] For ease of description, the coordinate system is defined as follows: Figure 2 As shown, the left and right directions are horizontal, the front and back directions are vertical, and the up and down directions are vertical.

[0025] This utility model discloses a flue gas denitrification ammonia injection grid device. (Refer to...) Figure 2 and Figure 3 A flue gas denitrification ammonia injection grid device is fixed inside a flue pipe, including an ammonia inlet pipe 1, which is horizontally fixed inside the flue pipe and has one end extending out of the flue pipe and connected to an ammonia source. An n-shaped tube 2 is fixed in the middle of the ammonia inlet pipe 1. The length of the n-shaped tube 2 is one-third the same as the length of the ammonia inlet pipe 1. Both ends of the n-shaped tube 2 are connected to the ammonia inlet pipe 1. Multiple distribution tubes 3 are fixed on both sides of the ammonia inlet pipe 1. The outer edge of the multiple distribution tubes 3 at the end away from the ammonia inlet pipe 1 is arc-shaped and matches the inner wall of the flue pipe. A plug is provided on the side of the distribution tube 3 away from the ammonia inlet pipe 1. The plug can be a small steel sheet, which is directly welded to the distribution tube 3. One end of the uniform distribution pipe 3 is connected to the ammonia inlet pipe 1, and the other end is fixed to the inner wall of the flue. The uniform distribution pipe 3 is provided with a plurality of uniform distribution holes 4 and a plurality of turbulence nozzles 5. The n-shaped pipe 2 is provided with a baffle 6 at both interface positions with the ammonia inlet pipe 1. The baffle 6 is located on the side close to the middle of the ammonia inlet pipe 1. The two baffles 6 are inclined to the side away from the middle of the ammonia inlet pipe 1.

[0026] In addition, such as Figure 2 As shown, a connecting rod 7 is fixed on each of the equalization pipes 3 on both sides of the ammonia inlet pipe 1; this improves the stability of the equalization pipe 3. Figure 3 As shown, the ammonia inlet pipe 1 is provided with a filter screen 8 on the side near the ammonia inlet direction; thereby improving the purity of ammonia and reducing impurities in the ammonia output.

[0027] In addition, a turbulence strip 9 is provided on the n-shaped tube 2 or the uniform distribution tube 3. The turbulence strip 9 can be made of cloth strips, which can increase the flowability of ammonia gas, thereby turbulent the output ammonia gas, improve the diffusion of ammonia gas, and thus improve the uniform dispersion of ammonia gas, so as to achieve uniform mixing of ammonia gas and flue gas.

[0028] This invention features an ammonia inlet pipe 1 with distribution pipes 3 on both sides. Ammonia is first introduced into the inlet pipe 1, filling it completely before being evenly distributed to both sides. This improves the uniformity of ammonia distribution to the distribution pipes 3. Furthermore, by incorporating an n-shaped pipe 2 on the inlet pipe 1, some ammonia can pass through the n-shaped pipe 2 before entering the rear end of the inlet pipe 1. This ensures a consistent ammonia input to the distribution pipes 3 on both sides of the rear end of the inlet pipe 1, preventing a reduction in ammonia input due to diversion at the front distribution pipe 3. This enhances the uniformity of ammonia distribution within the distribution pipes 3, improves the uniformity of ammonia dispersion, and improves the mixing uniformity of ammonia with flue gas, thereby improving the ammonia removal effect of the flue gas.

[0029] A baffle 6 is installed inside the ammonia inlet pipe 1, which has a certain guiding effect. The front baffle 6 facilitates the input of ammonia into the n-shaped pipe 2, and the rear baffle 6 facilitates the transmission of ammonia to the rear end of the ammonia inlet pipe 1.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. It should be understood that the specific embodiments described herein are only for understanding this utility model and are not intended to limit this utility model. All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this utility model.

Claims

1. A flue gas denitration ammonia injection grid device provided in a flue pipe, comprising an ammonia gas inlet pipe, characterized in that: The ammonia inlet pipe is fixed horizontally inside the flue pipe, with one end extending out of the flue pipe. An n-shaped tube is fixed in the middle of the ammonia inlet pipe, and the n-shaped tube is connected to the ammonia inlet pipe. Multiple equalization tubes are fixed on both sides of the ammonia inlet pipe. The outer edge of the multiple equalization tubes at the end away from the ammonia inlet pipe is arc-shaped and matches the inner wall of the flue pipe. A plug is provided on the side of the equalization tube away from the ammonia inlet pipe. One end of the equalization tube is connected to the ammonia inlet pipe, and the other end is fixed to the inner wall of the flue pipe. The equalization tube is provided with multiple equalization holes and multiple turbulence nozzles. A baffle is provided at each of the two interface positions between the n-shaped tube and the ammonia inlet pipe. The baffle is located on the side near the middle of the ammonia inlet pipe.

2. The ammonia injection lattice device for flue gas denitration according to claim 1, characterized in that: A connecting rod is fixed on each of the equalization pipes on both sides of the ammonia inlet pipe.

3. The ammonia injection lattice device for flue gas denitration according to claim 1, characterized in that: The ammonia inlet pipe has a filter screen on the side near the ammonia inlet direction.

4. The flue gas denitration ammonia injection grid device according to claim 1, characterized in that: The length of the n-shaped tube is one-third the length of the ammonia inlet tube.

5. The flue gas denitration ammonia injection grid device according to claim 1, characterized in that: The two baffles are tilted toward the side away from the middle of the ammonia inlet pipe.

6. The flue gas denitration ammonia injection grid device according to claim 1, characterized in that: A flow-dispersing strip is provided on the n-shaped tube or the uniformly distributed tube.

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