Ammonia injection grid for flue gas denitrification

Abstract

This utility model relates to the field of ammonia injection grid technology for denitrification reactors, and more particularly to an ammonia injection grid for flue gas denitrification, comprising multiple horizontal blowing branch pipes and vertical blowing branch pipes; wherein each of the multiple horizontal blowing branch pipes is vertically connected to a first horizontal connecting pipe; each of the multiple vertical blowing branch pipes is vertically connected to a second horizontal connecting pipe; multiple vertical blowing nozzles are evenly spaced on the vertical blowing branch pipes; each vertical blowing nozzle includes a jet pipe that is vertically connected to the vertical blowing branch pipe and parallel to the exhaust gas flow direction, and a gas distribution cone disposed at the gas outlet of the jet pipe. In this utility model, the horizontal blowing nozzles of the horizontal blowing branch pipes form a contact and mixing with the flue gas in the vertical direction; in addition, the vertical blowing nozzles on the vertical blowing branch pipes form a circulating ammonia gas, thereby increasing the jet state of the ammonia gas, thus fully contacting and reacting with the flue gas, which can shorten the mixing distance and improve the mixing uniformity compared with the prior art.

Description

Technical Field

[0001] This utility model relates to the field of ammonia injection grid technology for denitrification reactors, and more particularly to an ammonia injection grid for flue gas denitrification. Background Technology

[0002] Conventional flue gas denitrification usually uses the SCR catalyst reduction method. In this denitrification method, the degree of mixing between ammonia and flue gas is directly related to the denitrification efficiency. In existing equipment, ammonia injection is carried out by ammonia injection grid. The existing ammonia injection grid is set in the flue and has a relatively simple structure. The injected ammonia directly mixes with the flue gas vertically. The ammonia and flue gas contact form a single layer, which makes the mixing distance long and the mixing not uniform enough. Utility Model Content

[0003] The purpose of this invention is to provide an ammonia injection grid for flue gas denitrification, which solves the problem that conventional ammonia injection grids directly mix ammonia gas vertically with flue gas, resulting in a single ammonia gas contact with flue gas, a long mixing distance, and uneven mixing.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] This utility model provides an ammonia injection grid for flue gas denitrification, comprising multiple horizontal blowing branch pipes and multiple vertical blowing branch pipes respectively disposed in the intervals between adjacent horizontal blowing branch pipes; wherein each of the multiple horizontal blowing branch pipes is vertically connected to a first horizontal connecting pipe; each horizontal blowing branch pipe includes a first horizontal blowing branch pipe disposed at both ends of the first horizontal connecting pipe and multiple second horizontal blowing branch pipes located between two first horizontal blowing branch pipes; wherein multiple first horizontal blowing nozzles blowing toward the vertical blowing branch pipes are disposed on the first horizontal blowing branch pipes, and multiple second horizontal blowing nozzles and multiple third horizontal blowing nozzles are evenly spaced on the second horizontal blowing branch pipes; the second horizontal blowing nozzles and the third horizontal blowing nozzles are symmetrically arranged; each of the multiple vertical blowing branch pipes is vertically connected to the second horizontal connecting pipes; multiple vertical blowing nozzles are evenly spaced on the vertical blowing branch pipes; each vertical blowing nozzle includes a jet pipe that is vertically connected to the vertical blowing branch pipe and parallel to the exhaust gas flow direction, and an air distribution cone disposed at the air outlet of the jet pipe.

[0006] In this embodiment, the middle part of the first transverse connecting pipe is connected to the first main gas pipe, and the second transverse connecting pipe is connected to the second main gas pipe; wherein both the first main gas pipe and the second main gas pipe are connected to an external ammonia station; specifically, a safety filter, a flow meter, and an explosion-proof solenoid valve are also installed on both the first main gas pipe and the second main gas pipe.

[0007] Furthermore in this embodiment, the blowing direction of the first horizontal blowing nozzle is perpendicular to the flue gas flow direction; the first horizontal blowing branch pipe and the second horizontal blowing branch pipe are arranged in parallel; thereby facilitating the uniform mixing and contact of the blown ammonia gas with the flue gas.

[0008] Furthermore in this embodiment, the tip of the air distribution cone is axially connected to the outer wall of the longitudinal blowing nozzle via a connecting rod, and an air outlet communicating with the jet pipe is provided on the outer wall of the longitudinal blowing branch pipe.

[0009] Furthermore, in this embodiment, a gap is reserved between the conical surface of the gas distribution cone and the outlet of the jet pipe to facilitate the formation of a circulating ammonia gas and flue gas for contact and mixing.

[0010] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0011] In this invention, the horizontal blowing nozzle of the horizontal blowing branch pipe forms a contact and mix with the flue gas in the vertical direction; in addition, the vertical blowing nozzle on the vertical blowing branch pipe forms a circulating ammonia gas, thereby increasing the jet state of the ammonia gas and fully contacting and reacting with the flue gas. Compared with the prior art, this can shorten the mixing distance and improve the mixing uniformity. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings.

[0013] Figure 1 This is a schematic diagram of the main structure of the ammonia injection grid for flue gas denitrification according to this utility model;

[0014] Figure 2 This is a schematic diagram of the cross-section of the ammonia injection grid used for flue gas denitrification in operation according to this utility model;

[0015] Figure 3 This is a schematic diagram of the ammonia injection pipe frame structure in the ammonia injection grid used for flue gas denitrification according to this utility model;

[0016] Figure 4 for Figure 2 Schematic diagram of a partial cross-section.

[0017] Explanation of reference numerals in the attached diagram: 1. First main air pipe; 11. Cross-blowing branch pipe; 12. First cross-blowing nozzle; 13. Second cross-blowing nozzle; 2. Second main air pipe; 21. Longitudinal blow branch pipe; 22. Longitudinal blow nozzle; 221. Air distribution cone; 222. Air jet nozzle; 223. Air jet pipe. Detailed Implementation

[0018] refer to Figure 1This embodiment discloses an ammonia injection grid for flue gas denitrification, including four cross-blowing branch pipes and three longitudinal blowing branch pipes 21 respectively installed in the interval between adjacent cross-blowing branch pipes by brackets.

[0019] In this embodiment, reference Figure 1 and Figure 2 The system comprises multiple horizontal blowing branch pipes, each vertically connected to a first horizontal connecting pipe 13. Each horizontal blowing branch pipe includes a first horizontal blowing branch pipe 11 installed at both ends of the first horizontal connecting pipe 13, and multiple second horizontal blowing branch pipes 12 located between two first horizontal blowing branch pipes 11. Multiple first horizontal blowing nozzles 111 are installed on the first horizontal blowing branch pipes 11, blowing towards the vertical blowing branch pipes. Multiple second horizontal blowing nozzles 121 and multiple third horizontal blowing nozzles 122 are evenly spaced on the second horizontal blowing branch pipes 12. The second horizontal blowing nozzles 121 and the third horizontal blowing nozzles 122 are arranged symmetrically. Ammonia gas is sprayed using the third horizontal blowing nozzles 122 on the second horizontal blowing nozzles 121, adjacent to the second horizontal blowing nozzles 121, for reaction and combination with the flue gas.

[0020] In this embodiment, the blowing direction of the first cross-blowing nozzle 111 is perpendicular to the flue gas flow direction; the first cross-blowing branch pipe 11 and the second cross-blowing branch pipe 12 are arranged in parallel.

[0021] In this embodiment, reference Figure 2 and Figure 3 The multiple longitudinal blowing branch pipes 21 are all vertically connected to the second transverse connecting pipe 23; multiple longitudinal blowing nozzles 22 are evenly spaced on the longitudinal blowing branch pipes 21; the longitudinal blowing nozzles 22 include a jet pipe 223 that is vertically connected to the longitudinal blowing branch pipes 21 and parallel to the exhaust flow direction, and an air distribution cone 221 installed at the air outlet of the jet pipe 223.

[0022] In specific implementation, refer to Figure 4 The tip of the gas distribution cone 221 is axially connected to the outer wall of the longitudinal blowing nozzle 22 via a connecting rod, and a jet port 22 communicating with the jet pipe 223 is provided on the outer wall of the longitudinal blowing branch pipe 21; a gap is reserved between the conical surface of the gas distribution cone 221 and the outlet of the jet pipe 223; the ammonia gas ejected from the jet port 22 of the jet pipe 223 is blocked and diffused by the conical surface of the gas distribution cone 221, thereby forming an annular jet of ammonia gas with the axis of the gas distribution cone 221 as the circle, thereby enriching the contact state with the flue gas and improving the turbulence degree of mixing with the flue gas.

[0023] The first transverse connecting pipe 13 is connected to the first main air pipe 1 in the middle, and the second transverse connecting pipe 23 is connected to the second main air pipe 2; specifically, a safety filter, a flow meter, and an explosion-proof solenoid valve are also installed on the first main air pipe and the second main air pipe.

[0024] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Any modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. An ammonia injection grid for flue gas denitrification, characterized by: It includes multiple cross-blowing branch pipes and multiple longitudinal blowing branch pipes (21) respectively disposed in the intervals between adjacent cross-blowing branch pipes; Each of the multiple horizontal blowing branch pipes is vertically connected to a first horizontal connecting pipe (13); the horizontal blowing branch pipe includes a first horizontal blowing branch pipe (11) disposed at both ends of the first horizontal connecting pipe (13) and a multiple second horizontal blowing branch pipes (12) located between the two first horizontal blowing branch pipes (11); wherein a multiple first horizontal blowing nozzles (111) are disposed on the first horizontal blowing branch pipe (11) and blow towards the vertical blowing branch pipe, and a multiple second horizontal blowing nozzles (121) and a multiple third horizontal blowing nozzles (122) are evenly spaced on the second horizontal blowing branch pipes (12); the second horizontal blowing nozzles (121) and the third horizontal blowing nozzles (122) are symmetrically arranged; Multiple longitudinal blowing branch pipes (21) are vertically connected to the second transverse connecting pipe (23); multiple longitudinal blowing nozzles (22) are evenly spaced on the longitudinal blowing branch pipes (21); The longitudinal blowing nozzle (22) includes a jet pipe (223) that is vertically connected to the longitudinal blowing branch pipe (21) and parallel to the exhaust flow direction, and an air distribution cone (221) disposed at the air outlet of the jet pipe (223).

2. The ammonia injection lattice for flue gas denitrification according to claim 1, characterized in that: The first transverse connecting pipe (13) is connected to the first main air pipe (1) in the middle, and the second transverse connecting pipe (23) is connected to the second main air pipe (2).

3. The ammonia injection grid for flue gas denitrification according to claim 1, characterized in that: The blowing direction of the first cross-blowing nozzle (111) is perpendicular to the flue gas flow direction; the first cross-blowing branch pipe (11) and the second cross-blowing branch pipe (12) are arranged in parallel.

4. The ammonia injection grid for flue gas denitrification according to claim 1, characterized in that: The tip of the air distribution cone (221) is axially connected to the outer wall of the longitudinal blowing nozzle (22) via a connecting rod, and an air outlet (222) communicating with the jet pipe (223) is provided on the outer wall of the longitudinal blowing branch pipe (21).

5. The ammonia injection grid for flue gas denitrification according to claim 4, characterized in that: The conical surface of the air distribution cone (221) and the air outlet of the jet pipe (223) are reserved with a gap.

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