CN219252203U

CN219252203U - Ammonia spraying device suitable for SNCR technology

Info

Publication number: CN219252203U
Application number: CN202223220643.6U
Authority: CN
Inventors: 姜云礼; 陈祥斌; 陈磊; 吉泽; 杭江安
Original assignee: Anhui Dongzhi Guangxin Agrochemical Co Ltd
Current assignee: Anhui Dongzhi Guangxin Agrochemical Co Ltd
Priority date: 2022-12-01
Filing date: 2022-12-01
Publication date: 2023-06-27
Anticipated expiration: 2032-12-01

Abstract

The utility model relates to an ammonia spraying device suitable for an SNCR (selective non-catalytic reduction) process, which belongs to the technical field of SNCR denitration and comprises an ammonia pipeline and a clean flue gas pipeline, wherein the ammonia pipeline and the clean flue gas pipeline are communicated with a premixing bin, and a guide plate, a mixing turntable and a flow dividing plate are arranged in the premixing bin; the premixing bin is communicated with an ammonia spraying coil pipe; the end part of the premixing bin is provided with a mixing assisting bin, and the mixing assisting bin is provided with a V-shaped mixing assisting piece. Firstly, the premixing bin is arranged as a transition bin of ammonia gas and an ammonia spraying coil pipe, and the dispersibility of the ammonia gas is improved by utilizing the cooperation of the guide plate, the mixing turntable and the flow dividing plate which are arranged in the premixing bin; then, when the nozzle of the ammonia spraying coil pipe is blocked, the air pressure of the purified flue gas is increased, so that the spraying of the nozzle is realized, the problem of blocking the nozzle is relieved, and the service life of the device is prolonged; finally, the V-shaped auxiliary mixing piece is favorable for improving the mixing degree of ammonia gas and smoke gas, and further the purpose of improving the utilization efficiency of the ammonia gas is achieved.

Description

Ammonia spraying device suitable for SNCR technology

Technical Field

The utility model belongs to the technical field of SNCR denitration, and particularly relates to an ammonia spraying device suitable for an SNCR process.

Background

SNCR is a selective non-catalytic reduction technology, which is characterized in that under the action of no catalyst, a reducing agent is sprayed into a temperature window suitable for denitration reaction, nitrogen oxides in flue gas are reduced into harmless nitrogen and water, an ammonia spraying device is generally arranged in a flue between a kiln and a dust removal system, ammonia water is atomized and sprayed into the flue by the ammonia spraying device, and the ammonia water and the flue are fully mixed for reaction.

The dispersibility of ammonia in a flue in an SNCR process has obvious influence on the denitration effect, the existing process generally utilizes an ammonia spraying grid as an ammonia spraying device, the ammonia spraying grid is integrally in a grid shape, a large number of ammonia pipes are crossed and extend into the flue, a plurality of small nozzles are arranged on each pipe and are positioned in the section of the flue to spray ammonia, the ammonia spraying grid is generally horizontally arranged at a certain height position of a vertical flue of a denitration inlet, the ammonia spraying nozzles are arranged in the lee direction of the ammonia spraying grid, and ammonia is sprayed into the flue gas along the flow direction of the flue gas.

The traditional ammonia spraying grid is provided with a plurality of nozzles reasonably, the maximization of the ammonia spraying range is controlled by reasonably controlling the density of the nozzles, but the mixing uniformity of ammonia and smoke in the smoke channel can not be further improved after the ammonia is sprayed to the smoke channel, in industrial production, the ammonia often flows in the form of ammonia gas clusters through the spray openings of the nozzles, the utilization efficiency of the ammonia is low, the increasingly growing atmospheric emission requirement is difficult to reach, in order to achieve standard emission, excessive spraying of the ammonia can lead to the increase of ammonia escape, and therefore, the SNCR technology is always the problem of how to further improve the uniform mixing property of the ammonia and the smoke.

Disclosure of Invention

In order to solve the technical problems in the background art, the utility model provides an ammonia spraying device suitable for an SNCR process.

The aim of the utility model can be achieved by the following technical scheme:

the ammonia spraying device suitable for the SNCR process comprises an ammonia pipeline, wherein one end of the ammonia pipeline is communicated with an ammonia source, the other end of the ammonia pipeline is communicated with a premixing bin, and the ammonia pipeline is fixed at the side wall of a flue of the SNCR process through a flange;

the ammonia gas purifying device is characterized in that an ammonia gas port, a smoke purifying port and a plurality of ammonia conveying ports are formed in a bin body of the premixing bin, the ammonia gas port is communicated with an ammonia pipeline, an ammonia conveying pipe is arranged at the ammonia conveying port, one end of the ammonia conveying pipe is communicated with the ammonia conveying port, an ammonia spraying coil pipe is communicated with the other end of the ammonia conveying pipe, a plurality of nozzles are formed in the ammonia spraying coil pipe, and ammonia is sprayed into a flue of the SNCR process from the nozzles through the premixing bin to complete the ammonia spraying process.

Further, a clean flue gas pipeline is communicated with the premixing bin, one end of the clean flue gas pipeline is communicated with clean flue gas in a factory, and the other end of the clean flue gas pipeline is communicated with a clean flue gas port.

In the structure, the arrangement of the clean flue gas pipeline has the following functions: firstly, utilize clean flue gas to further improve the dispersion degree of ammonia, through premixing clean flue gas and ammonia, prevent that ammonia from being ammonia group, it is lower to lead to spouting the contact efficiency with the flue gas after the flue, lead to denitration effect reduction, the uneven increase that still can cause the ammonia escape of ammonia distribution, then, clean flue gas pipeline can also play the function of clearance nozzle, current ammonia injection device exists a pain point, nozzle department is very easily to take place to block up, because contain a large amount of sulfur dioxide and vapor in the flue gas in the kiln, the viscous substance such as ammonium bisulfate easily appears in the nozzle department of ammonia injection device piles up, the stickness material of pile up can adhere the smoke and dust again, lead to more seriously blocking up, and ammonia injection device fixed mounting is inside the pipeline, dismantle maintenance and change needs the shutdown maintenance, it consumes a large amount of manpower and materials and influence factory production continuity to dismantle the maintenance, set up clean flue gas pipeline, through adjusting the valve opening of ammonia pipeline and clean flue gas pipeline, reduce the ammonia pipeline in the short time, increase the pressure of clean flue gas pipeline, can realize the self-cleaning to the nozzle, and the life of the ammonia injection device can be showing to promote in a short time.

Further, a section of screw thread connection of premixing storehouse far away from the ammonia gas port helps thoughtlessly storehouse, and the storehouse lateral surface that helps thoughtlessly storehouse is installed a plurality of supports, installs a plurality of and helps thoughtlessly spare on the support.

Further, the mixing assisting piece is V-shaped.

In the structure, after the V-shaped auxiliary mixing piece is arranged in the flue, the vortex mixing phenomenon is formed at the V-shaped groove after the flue gas and the ammonia gas pass through the V-shaped auxiliary mixing piece, so that the mixing degree of the ammonia gas and the flue gas is further improved, and the aim of auxiliary improvement of removal of nitrogen oxides is fulfilled.

Further, the ammonia spraying coil pipe comprises a plurality of groups, and the diameter of the disc surface of the ammonia spraying coil pipe is gradually decreased along the flow direction of the flue gas in the flue. The ammonia spraying coil pipes with different disc surface diameters are arranged, so that the ammonia spraying coverage area of the ammonia spraying coil pipes is improved, and the dispersibility of ammonia gas is improved.

Further, fixedly mounted in the premixing bin is a guide plate, the guide plate is arranged on the side of the clean smoke port, a mixing turntable is arranged on the side, away from the clean smoke port, of the guide plate, the mixing turntable is rotatably mounted with the bin body of the premixing bin, and the guide direction of the guide plate faces the mixing turntable. The flow guiding effect of the flow guiding plate is utilized, the purified flue gas can drive the mixing turntable to rotate, the ammonia gas port is formed in one side close to the mixing turntable, and the ammonia gas and the purified flue gas can be fully mixed by utilizing the cooperation of the flow guiding plate and the mixing turntable.

Further, a plurality of flow dividing plates are fixedly arranged in the premixing bin. The provision of the diverter plates facilitates the uniform passage of ammonia gas through each ammonia injection coil.

The utility model has the beneficial effects that:

firstly, a premixing bin is arranged and is used as a transition bin of ammonia gas and an ammonia spraying coil pipe, the premixing bin is communicated with a clean flue gas pipeline, and the dispersibility of the ammonia gas is improved by utilizing the cooperation of a guide plate, a mixing turntable and a flow dividing plate which are arranged in the premixing bin; then, when the nozzle of the ammonia spraying coil pipe is blocked, the air pressure of the purified flue gas is increased, so that the spraying of the nozzle is realized, the problem of blocking the nozzle is relieved, and the service life of the device is prolonged; then, the V-shaped auxiliary mixing piece is arranged, and after the flue gas and the ammonia gas pass through the V-shaped auxiliary mixing piece, vortex mixing is formed at the groove of the V-shaped auxiliary mixing piece, so that the mixing degree of the ammonia gas and the flue gas is further improved, and the purpose of improving the utilization efficiency of the ammonia gas is further achieved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of an installation position of an ammonia spraying device of the present utility model;

FIG. 2 is a schematic diagram of an ammonia spraying device according to the present utility model;

FIG. 3 is an elevation view of the ammonia injection coil of the present utility model;

fig. 4 is a schematic structural view of the mixing aid according to the present utility model.

In the drawings, the list of components represented by the various numbers is as follows:

1. a kiln; 2. an ammonia spraying device; 21. an ammonia gas pipeline; 22. a clean flue gas pipeline; 23. a flange plate; 24. premixing bin; 241. an ammonia gas port; 242. a smoke purifying port; 243. an ammonia delivery port; 244. ammonia spraying coil pipe; 2441. an ammonia conveying pipe; 2442. a nozzle; 245. a deflector; 246. a mixing turntable; 247. a diverter plate; 25. a mixing assisting bin; 251. a bracket; 252. a mixing aid; 3. a dust removal system; 4. a desulfurization system.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1, the SNCR process generally includes a kiln 1, a dust removal system 3 and a desulfurization system 4, wherein an ammonia spraying device 2 is generally installed in a flue between the kiln 1 and the dust removal system 3, the ammonia spraying device 2 sprays ammonia into the flue under pressure, and the ammonia is fully mixed with the flue gas for reaction.

Referring to fig. 2-4, the ammonia spraying device suitable for SNCR process of the present utility model includes an ammonia pipeline 21, a clean flue gas pipeline 22 is disposed at one side of the ammonia pipeline 21, valves are mounted on the ammonia pipeline 21 and the clean flue gas pipeline 22, the ammonia pipeline 21 and the clean flue gas pipeline 22 are fixed on a flue through a flange plate 23, one ends of the ammonia pipeline 21 and the clean flue gas pipeline 22 are disposed in the flue, the other ends are disposed outside the flue, the ammonia pipeline 21 disposed outside the flue is communicated with an ammonia source of a factory, the clean flue gas pipeline 22 disposed outside the flue is communicated with clean flue gas of the factory, one ends of the ammonia pipeline 21 and the clean flue gas pipeline 22 disposed in the flue are communicated with a premixing bin 24, a ammonia gas port 241, a clean flue gas port 242 and a plurality of groups of ammonia delivering ports 243 are disposed on a bin body of the premixing bin 24, the ammonia gas port 241 is communicated with the ammonia gas pipeline 21, the clean flue gas port 242 is communicated with the clean flue gas pipeline 22, an ammonia conveying pipe 2441 is arranged at the ammonia conveying port 243, one end of the ammonia conveying pipe 2441 is communicated with the ammonia conveying port 243, the other end of the ammonia conveying pipe 2441 is communicated with an ammonia spraying coil pipe 244, a plurality of nozzles 2442 are arranged on the ammonia spraying coil pipe 244, most factory areas generally adopt circular welded pipes as flues, therefore, the disc-shaped ammonia spraying coil pipe 244 is beneficial to improving the dispersibility of ammonia gas when spraying ammonia, meanwhile, the utility model is provided with a plurality of groups of ammonia spraying coil pipes 244, the diameters of the disc surfaces of the ammonia spraying coil pipes 244 are gradually reduced along the flow direction of flue gas in the flues, and the ammonia spraying coil pipes 244 with different diameters are beneficial to improving the coverage area of ammonia spraying, and the utilization efficiency of ammonia gas and the denitration efficiency of the whole denitration system are beneficial to be improved; the guide plate 245 is fixedly installed in the premixing bin 24, wherein the guide plate 245 is arranged on the side of the clean flue gas port 242, the mixing turntable 246 is arranged on the side, away from the clean flue gas port 242, of the guide plate 245, the mixing turntable 246 is rotatably installed with the bin body of the premixing bin 24, the guide direction of the guide plate 245 faces the mixing turntable 246, the clean flue gas can drive the mixing turntable 246 to rotate by utilizing the guide effect of the guide plate 245, the ammonia port 241 is arranged on the side, close to the mixing turntable 246, of the ammonia gas and the clean flue gas, the ammonia gas can be fully mixed by utilizing the cooperation of the guide plate 245 and the mixing turntable 246, a plurality of flow dividing plates 247 are further installed in the premixing bin 24, and the flow dividing plates 247 are arranged to facilitate the ammonia gas to uniformly pass through the ammonia spraying coils 244, so that the ammonia is uniformly sprayed.

One end of the premixing bin 24 far away from the flange plate 23 is in threaded connection with the auxiliary mixing bin 25, a plurality of brackets 251 are arranged on the outer side face of the bin body of the auxiliary mixing bin 25, a plurality of auxiliary mixing pieces 252 are arranged on the brackets 251, the auxiliary mixing pieces 252 are in a V shape, and the auxiliary mixing pieces 252 in the V shape are arranged to assist the diffusion of ammonia gas.

Working principle:

when the ammonia spraying device suitable for the SNCR technology is used, firstly, the ammonia spraying device 2 is fixedly arranged in a flue between the kiln 1 and the dust removal system 3 through the flange plate 23, the ammonia pipeline 21 is communicated with the output end of an ammonia gas source in a factory, the clean flue gas pipeline 22 is communicated with clean flue gas in the factory, after the installation is finished, the flow is regulated and controlled by controlling valves on the ammonia pipeline 21 and the clean flue gas pipeline 22, so that the content of nitrogen oxides in the directly discharged flue gas of a chimney reaches the national standard, and meanwhile, the data of ammonia escape in the directly discharged flue gas of the chimney is ensured to reach the national standard. When the ammonia spraying device 2 works normally, the purified flue gas drives the mixing turntable 246 to rotate under the guiding action of the guide plate 245, the mixing turntable 246 drives ammonia gas and the purified flue gas to be mixed, the dispersibility of the ammonia gas is further improved, the ammonia gas is conveyed to the ammonia spraying coil pipe 244 through the ammonia conveying pipe 2441 and sprayed out through the nozzle 2442, meanwhile, the V-shaped mixing assisting piece 252 is arranged on the mixing assisting bin 25, and after the flue gas and the ammonia gas pass through the V-shaped mixing assisting piece 252, vortex mixing can be formed at the groove of the V-shaped mixing assisting piece 252, so that the mixing degree of the ammonia gas and the flue gas is further improved, the aim of efficiently removing nitrogen oxides is fulfilled, and when the nozzle 2442 of the ammonia spraying coil pipe 244 is blocked, the flow velocity of the purified flue gas is improved through reducing the flow velocity of the ammonia gas, and the flushing function of the nozzle 2442 can be achieved.

In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is merely illustrative of the structures of this utility model and various modifications, additions and substitutions for those skilled in the art can be made to the described embodiments without departing from the scope of the utility model or from the scope of the utility model as defined in the accompanying claims.

Claims

1. The ammonia spraying device suitable for the SNCR process is characterized by comprising an ammonia pipeline (21), wherein one end of the ammonia pipeline (21) is communicated with an ammonia source, the other end of the ammonia pipeline (21) is communicated with a premixing bin (24), and the ammonia pipeline (21) is fixed at the side wall of a flue of the SNCR process through a flange;

an ammonia gas port (241), a clean flue gas port (242) and a plurality of ammonia conveying ports (243) are formed in the bin body of the premixing bin (24), the ammonia gas port (241) is communicated with an ammonia pipeline (21), an ammonia conveying pipe (2441) is arranged at the ammonia conveying port (243), one end of the ammonia conveying pipe (2441) is communicated with the ammonia conveying port (243), an ammonia spraying coil pipe (244) is arranged at the other end of the ammonia conveying pipe (2441), a plurality of nozzles (2442) are formed in the ammonia spraying coil pipe (244), and ammonia is sprayed into a flue of the SNCR process from the nozzles (2442) through the premixing bin (24), so that the ammonia spraying process is completed.

2. An ammonia spraying device suitable for an SNCR process according to claim 1, wherein the premixing bin (24) is communicated with a clean flue gas pipeline (22), one end of the clean flue gas pipeline (22) is communicated with clean flue gas in a factory, and the other end of the clean flue gas pipeline is communicated with a clean flue gas port (242).

3. The ammonia spraying device suitable for the SNCR process according to claim 1, wherein a section of the premixing bin (24) far away from the ammonia gas port (241) is connected with an auxiliary mixing bin (25) through threads, a plurality of brackets (251) are arranged on the outer side face of the auxiliary mixing bin (25), a plurality of auxiliary mixing pieces (252) are arranged on the brackets (251), and the auxiliary mixing pieces (252) are V-shaped auxiliary mixing pieces (252).

4. An ammonia injection device suitable for SNCR process according to claim 1, wherein the ammonia injection coil (244) comprises several groups, the diameter of the surface of the ammonia injection coil (244) decreasing in the direction of flow of the flue gas in the flue.

5. The ammonia spraying device suitable for the SNCR process according to claim 1, wherein a guide plate (245) is fixedly installed in the premixing bin (24), the guide plate (245) is arranged on the side of the clean flue gas port (242), a mixing rotary table (246) is arranged on the side, away from the clean flue gas port (242), of the guide plate (245), the mixing rotary table (246) is rotatably installed with the bin body of the premixing bin (24), and the guide direction of the guide plate (245) faces the mixing rotary table (246).

6. An ammonia spraying device suitable for SNCR process according to claim 1, characterized in that a plurality of flow dividing plates (247) are fixedly arranged in the premixing bin (24).