CN114939306A

CN114939306A - Novel from guide plate of taking large granule ash desorption device

Info

Publication number: CN114939306A
Application number: CN202210602706.XA
Authority: CN
Inventors: 贾林权; 牛国平; 牛拥军; 蒙毅; 雷鸣; 常磊; 吕晨峰; 姚皓; 安振; 周梦伟; 殷结峰; 范江; 王彪
Original assignee: Xian Xire Boiler Environmental Protection Engineering Co Ltd
Current assignee: Xian Xire Boiler Environmental Protection Engineering Co Ltd
Priority date: 2022-05-30
Filing date: 2022-05-30
Publication date: 2022-08-26

Abstract

The invention discloses a novel guide plate device with large particle ash removal function, which comprises a plurality of guide plate bodies, wherein the tail end of each guide plate body is provided with a large particle ash collecting device, and the device can effectively solve the problems that the denitration large particle ash of a thermal power plant abrades and blocks a catalyst.

Description

Novel from guide plate of taking large granule ash desorption device

Technical Field

The invention belongs to the technical field of large particle ash removal on a flue gas side of a boiler denitration device, and relates to a novel guide plate device with large particle ash removal function.

Background

The selective catalytic reduction denitration technology is widely applied to coal-fired power stations by a mature process and higher denitration efficiency. The denitration catalyst is the most important functional material in the SCR system, and the service life of the denitration catalyst has great influence on the denitration efficiency and the economic cost during the operation of a unit, but the performance of the denitration catalyst is reduced due to the influence of various adverse factors when the denitration catalyst is used, and ash carried in flue gas is one of the denitration catalysts. The SCR system usually adopts a high-dust arrangement, i.e. between the economizer and the air preheater, and the flue gas is not dedusted, so that the dust content is high, which causes the catalyst to be blocked and abraded, especially the influence of large particle ash therein is the largest. Large particle ash is generated during combustion and fine particle fly ash is agglomerated into large particles due to a slag phenomenon.

The large granular ash is of a porous structure, the density is small, the appearance is irregular, and the large granular ash cannot pass through the catalyst. Due to the limited pitch of the catalyst, large particle ash particles cannot pass through the catalyst, so that the catalyst is blocked, and in a severe case, the flow area is reduced due to the blockage, and the flue gas flow velocity in a local area is increased to cause the abrasion of the catalyst. Generally, the fly ash particles with a particle size of a certain order of magnitude can cause the catalyst to be blocked, and for fly ash particles with a larger diameter, it is not feasible to prevent the blockage only from the structural design of the catalyst, and the fly ash particles must be removed before entering the catalyst. During the development of the U.S. power station, popcorn fly ash up to 10mm in diameter has been shown to cause severe blockage of the air preheater.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a novel flow guide plate device with large particle ash removal function, which can effectively solve the problems that the large particle ash generated in the denitration of a thermal power plant abrades and blocks a catalyst.

In order to achieve the purpose, the novel guide plate device with the large particle ash removal function comprises a plurality of guide plate bodies, wherein the tail end of each guide plate body is provided with a large particle ash collecting device.

The cross section of the large particle ash collecting device is of a hook-shaped structure.

The cross section of the large particle ash collecting device is of a circular arc-shaped structure.

The guide plate bodies are parallel and distributed at equal intervals.

The flow guide plate body is sequentially divided into a first flow guide plate section and a second flow guide plate section along the smoke flowing direction, wherein the first flow guide plate section is parallel to the smoke flowing direction, and the second flow guide plate section is crossed with the smoke flowing direction.

Along the flowing direction of the flue gas, the ends of the second flow guide plates are distributed upwards in an inclined mode.

The invention has the following beneficial effects:

when the novel guide plate device with large particle ash removal function is in specific operation, boiler flue gas is guided by the guide plate body, and the direction of the flue gas is changed after the boiler flue gas is guided by the guide plate body, wherein after the large particle ash with larger mass is guided by the guide plate body, the large particle ash enters the large particle ash collecting device arranged at the tail end of the guide plate body along the direction of the guide plate body due to large gravity inertia, and the large particle ash is collected, so that the problems that the catalyst is abraded and blocked by the denitration large particle ash of a thermal power plant are solved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a block diagram of a baffle body;

fig. 3 is a sectional view taken along the direction a in fig. 2.

Wherein, 1 is the guide plate body, 2 is large granule ash collection device.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.

Referring to fig. 1, 2 and 3, the novel deflector device with large particle ash removal function of the present invention comprises a plurality of deflector bodies 1, wherein a large particle ash collecting device 2 is disposed at the end of the deflector body 1, wherein the cross section of the large particle ash collecting device 2 is in a hook-shaped structure or an arc-shaped structure, and the deflector bodies 1 are parallel and equidistantly distributed;

the guide plate body 1 is divided into a first guide plate section and a second guide plate section in sequence along the smoke flowing direction, wherein the first guide plate section is parallel to the smoke flowing direction, the second guide plate section is crossed with the smoke flowing direction, and the second guide plate end is distributed upwards in an inclined mode along the smoke flowing direction.

At the during operation, the boiler flue gas leads through guide plate body 1, after leading through guide plate body 1, the flue gas direction changes, wherein, the great large granule ash of quality is behind the water conservancy diversion effect, because gravity inertia is big, get into the large granule ash collection device 2 that the tip of guide plate body 1 was arranged along guide plate body 1 direction, collect the large granule ash, the flue gas continues to flow downstream after the desorption, the large granule ash is discharged to the flue outside through defeated ash system, realize the purpose of large granule ash desorption.

The invention has the advantages of feasible principle, mature technology, great influence of large particle ash carried in the flue gas of the coal-fired power plant on an SCR flue gas denitration system, effective removal of large particle dust after the addition of the invention, continuous and stable operation, wide application prospect in the coal-fired power plant in China, obvious reduction of the system operation cost and stable operation.

Claims

1. The utility model provides a novel from guide plate device of taking large granule ash desorption, its characterized in that, includes a plurality of guide plate bodies (1), and wherein, the end of guide plate body (1) is provided with large granule ash collection device (2).

2. The novel deflector device with large particle ash removal function as claimed in claim 1, wherein the cross section of the large particle ash collecting device (2) is in a hook-shaped structure.

3. The novel deflector device with large particle ash removal function as claimed in claim 1, wherein the cross section of the large particle ash collecting device (2) is in a circular arc structure.

4. The novel deflector device with large particle ash removal function according to claim 1, wherein the deflector bodies (1) are distributed in parallel and at equal intervals.

5. The novel flow guide plate device with large particle ash removal function according to claim 1, wherein the flow guide plate body (1) is sequentially divided into a first flow guide plate section and a second flow guide plate section along the flue gas flowing direction.

6. The novel deflector device with large particle ash removal function of claim 5, wherein the first deflector section is parallel to the flow direction of flue gas.

7. The novel deflector device with large particle ash removal function of claim 5, wherein the second deflector section intersects with the flow direction of flue gas.

8. The novel deflector device with large particle ash removal function of claim 5, wherein the second deflector end is distributed obliquely upwards along the flow direction of flue gas.