CN210861155U

CN210861155U - Purging device of low-temperature economizer

Info

Publication number: CN210861155U
Application number: CN201921555038.XU
Authority: CN
Inventors: 刘晓立; 孙立群; 赵冰; 安亚丽
Original assignee: China Huadian Engineering Group Co Ltd; Huadian Environmental Protection Engineering and Technology Co Ltd
Current assignee: China Huadian Engineering Group Co Ltd; Huadian Environmental Protection Engineering and Technology Co Ltd
Priority date: 2019-09-18
Filing date: 2019-09-18
Publication date: 2020-06-26
Anticipated expiration: 2029-09-18

Abstract

The utility model discloses a purging device of a low-temperature economizer, which comprises a purging main pipe, a leading pipe and 3 purging branch pipes, wherein one end of the purging main pipe is connected with the leading pipe, the 3 purging branch pipes are communicated with the purging main pipe and are arranged in an inlet reducing flue, and the 3 purging branch pipes are provided with spray holes; along the flowing direction of flue gas, the caliber of the spray hole on the first purging branch pipe is vertically downward, the distance d2 between the purging branch pipe closest to the low-temperature economizer body and the low-temperature economizer body is 200-500 mm, and the distance d3 between every two adjacent purging branch pipes is 200-500 mm. The utility model discloses simple structure, with low costs, effectual.

Description

Purging device of low-temperature economizer

Technical Field

The utility model relates to a low temperature economizer sweep device belongs to industrial flue gas purification and waste heat recovery fields such as coal fired power plant boiler, industrial boiler.

Background

The low-temperature economizer is mainly installed on a flue between the back of an air preheater of a power plant boiler and the front of an electric precipitator and is used as heat exchange equipment on an outlet of the air preheater of the coal-fired power plant boiler and an inlet flue of the electric precipitator, and the low-temperature economizer has the main effects of reducing the smoke discharge temperature of the boiler, recovering the heat of smoke and improving the boiler efficiency; 2. the specific resistance of dust and the actual smoke amount are reduced, and the dust removal efficiency is improved; 3. reducing the water supplement of desulfurization; 4. the concentration of dust at the outlet of the desulfurization absorption tower is reduced, and the ultralow emission of a power plant is realized. At present, most power plant boiler units in China have low operation load, so the flow velocity of flue gas in a flue is lower than a design value of 9m/s, the fly ash carrying capacity of the flue gas is weakened, the ash accumulation in the horizontal section is serious, and the economy and the safety of a boiler are directly influenced. At present, most power plant boiler units in China have low operation load, so the flow velocity of flue gas in a flue is lower than a design value of 9m/s, the fly ash carrying capacity of the flue gas is weakened, the accumulated ash in the flue is serious, the economy and the safety of a boiler are directly influenced, the traditional soot blowing equipment has a complex structure, a combined action of multiple control systems is needed, and the operation steps are complicated.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a low temperature economizer sweep device, should sweep device simple structure, the deashing is effectual.

In order to solve the technical problem, the utility model discloses a following technical scheme: a purging device of a low-temperature economizer comprises a purging main pipe, a leading pipe and 3 purging branch pipes, wherein one end of the purging main pipe is connected with the leading pipe, the 3 purging branch pipes are communicated with the purging main pipe and arranged in an inlet reducing flue, and the 3 purging branch pipes are provided with spray holes; along the flowing direction of flue gas, the caliber of the spray hole on the first purging branch pipe is vertically downward, the distance d2 between the purging branch pipe closest to the low-temperature economizer body and the low-temperature economizer body is 200-500 mm, and the distance d3 between every two adjacent purging branch pipes is 200-500 mm. One end of the guiding pipe is connected with a sweeping air supply device. And conveying the purging air into the purging main pipe through the guide connecting pipe by the air supply device. The blowing air enters the inlet reducing flue through the spray holes in the blowing branch pipes, so that the blowing of ash in the inlet reducing flue is realized through the blowing air entering the inlet reducing flue, and the purpose of ash removal is realized.

The inventor tests and researches find that a certain influence factor exists on the distance between two adjacent purging branch pipes due to the distance between the diameter-expanding section of the reducing flue, materials are wasted if the distance between two adjacent purging branch pipes is too small, and the purging coverage is incomplete if the distance is too large, and after the research, the distance between the two purging branch pipes is set to be 200-500 mm, so that a better dust cleaning effect can be achieved, and the optimal distance is 350 mm.

In the purging device of the low-temperature economizer, the distance d1 between the 3 purging branch pipes and the bottom of the inlet reducing flue ranges from 500mm to 1000 mm. Considering that the height of the ash deposition at the bottom of the flue of the low-temperature and low-temperature coal economizer is generally 200mm-700mm, in order to prevent the ash deposition from burying 3 purging branch pipes and spray holes, the distance d1 between the 3 purging branch pipes and the bottom of the inlet reducing flue is 500 mm-1000 mm.

In the purging device of the low-temperature economizer, the distance d1 between the 3 purging branch pipes and the bottom of the inlet reducing flue is 800 mm.

In the purging device of the low-temperature economizer, the distance d3 between two adjacent purging branch pipes is 300 mm.

According to the purging device of the low-temperature economizer, the aperture of the spray hole is 5-15 mm.

If the hole is too small, the blowing effect is not good, the hole is too large, the required air amount is too large, and the aperture of the spray hole is set to be 5-15 mm in consideration of the ash deposition amount at the bottom of the flue and the maximum blowing air amount which can be provided by the air supply device, so that the optimal ash removal effect is ensured.

According to the purging device of the low-temperature economizer, the aperture of the spraying hole is 8 mm.

In the purging device of the low-temperature economizer, an included angle between the caliber of the spray hole in the second purging branch pipe and a vertical surface is 10 degrees.

In the purging device of the low-temperature economizer, an included angle between the caliber of the spray hole in the third purging branch pipe and the vertical plane is 25 degrees. The arrangement mode can enlarge the sweeping range and can also enable fly ash to be cleared away along the flowing direction of flue gas.

In the purging device for the low-temperature economizer, the distance d2 between the purging branch pipe closest to the low-temperature economizer body and the low-temperature economizer body is 300 mm.

Compared with the prior art, the utility model is more suitable for the inlet reducing flue section at the inlet of the low-temperature economizer, the scheme is simpler than the traditional soot blowing scheme system, the utility model can realize the cleaning of the soot deposition in the flue of the low-temperature economizer only by arranging the purging main pipe and 3 purging branch pipes and other structures at the inlet reducing flue, the equipment is simple, the operation is simple, the initial investment is saved, and the subsequent operation maintenance cost is reduced; taking 1 unit 300MW unit as an example, the investment of the traditional soot blowing scheme is about 40 ten thousand yuan, while the utility model discloses only need about 5 ten thousand yuan.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention without undue limitation of the invention. In the drawings:

fig. 1 is a schematic plan view of the present invention;

fig. 2 is a schematic elevation structure of the present invention;

fig. 3 is a schematic view of a portion of the structure of fig. 2 from a-a.

Reference numerals: 1-purging main pipe, 2-leading pipe, 3-purging branch pipe, 301-first purging branch pipe, 302-second purging branch pipe, 303-third purging branch pipe, 4-inlet reducing flue, 5-spray hole and 6-low-temperature economizer body.

The present invention will be further described with reference to the accompanying drawings and the detailed description.

Detailed Description

In order to make the technical solution of the present invention better understood, the following description is given with reference to the accompanying drawings in the embodiments of the present invention, and the technical solution in the embodiments of the present invention is clearly and completely described. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Embodiment 1 of the utility model: a purging device of a low-temperature economizer comprises a purging main pipe 1, a leading

pipe

2 and 3 purging branch pipes 3, wherein one end of the purging main pipe 1 is connected with the leading pipe 2, the 3 purging branch pipes 3 are communicated with the purging main pipe 1 and arranged in an inlet reducing flue 4, and the 3 purging branch pipes 3 are provided with spray holes 5; along the flowing direction of flue gas, the caliber of the spray hole on the first purging branch pipe 301 is vertically downward, the distance d2 between the purging branch pipe closest to the low-temperature economizer body 6 and the low-temperature economizer body 6 is 200mm, and the distance d3 between two adjacent purging branch pipes is 200 mm.

Embodiment 2 of the utility model: the utility model provides a low temperature economizer sweep device, is responsible for 1, draws

takeover

2 and 3 branch pipes 3 that sweep including sweeping, the one end that sweeps and be responsible for 1 is connected with drawing

takeover

2, 3 sweep branch pipes 3 all with sweep and be responsible for 1 intercommunication and set up in

import reducing flue

4, 3 sweep all be provided with orifice 5 on the branch pipe 3, the aperture of orifice is 5 mm. Along the flowing direction of the flue gas, the caliber of the spray hole on the first purging branch pipe 301 is vertically downward, the distance d2 between the purging branch pipe closest to the low-temperature economizer body 6 and the low-temperature economizer body 6 is 500mm, and the distance d3 between two adjacent purging branch pipes is 500 mm. The distance d1 between the 3 purging branch pipes 3 and the bottom of the inlet reducing flue 4 is 500 mm.

The included angle between the caliber of the spray hole on the second purging branch pipe 302 and the vertical surface is 10 degrees. The included angle between the caliber of the spray hole on the third purging branch pipe 303 and the vertical surface is 25 degrees.

Embodiment 3 of the utility model: the utility model provides a low temperature economizer sweep device, is responsible for 1, draws

takeover

import reducing flue

4, 3 sweep all be provided with orifice 5 on the branch pipe 3, the aperture of orifice is 15 mm. Along the flowing direction of the flue gas, the caliber of the spray hole on the first purging branch pipe 301 is vertically downward, the distance d2 between the purging branch pipe closest to the low-temperature economizer body 6 and the low-temperature economizer body 6 is 250mm, and the distance d3 between two adjacent purging branch pipes is 250 mm. The distance d1 between the 3 purging branch pipes 3 and the bottom of the inlet reducing flue 4 is 800 mm. The included angle between the caliber of the spray hole on the second purging branch pipe 302 and the vertical surface is 10 degrees. The included angle between the caliber of the spray hole on the third purging branch pipe 303 and the vertical surface is 25 degrees.

Embodiment 4 of the utility model: the utility model provides a low temperature economizer sweep device, is responsible for 1, draws

takeover

import reducing flue

4, 3 sweep all be provided with orifice 5 on the branch pipe 3, the aperture of orifice is 8 mm. Along the flowing direction of the flue gas, the caliber of the spray hole on the first purging branch pipe 301 is vertically downward, the distance d2 between the purging branch pipe closest to the low-temperature economizer body 6 and the low-temperature economizer body 6 is 250mm, and the distance d3 between every two adjacent purging branch pipes is 330 mm. The distance d1 between the 3 purging branch pipes 3 and the bottom of the inlet reducing flue 4 is 900 mm. The included angle between the caliber of the spray hole on the second purging branch pipe 302 and the vertical surface is 10 degrees. The included angle between the caliber of the spray hole on the third purging branch pipe 303 and the vertical surface is 25 degrees.

The utility model discloses a theory of operation: the utility model introduces the blowing air into the blowing main pipe 1 by using the guiding connection pipe 2, the blowing air can respectively enter into 3 blowing branch pipes communicated with the blowing main pipe 1 by the blowing main pipe 1, the blowing air sprayed from the spray holes on the first blowing branch pipe 301 can be vertically sprayed out by vertically downwards arranging the caliber of the spray holes on the first blowing branch pipe 301, thereby blowing the dust in the pipeline under the spray holes on the first blowing branch pipe 301, the blown dust is entrained by the flue gas and flows along the flowing direction of the flue gas, then the caliber of the spray holes on the second blowing branch pipe 302 is arranged to form an angle of 10 degrees along the flowing direction of the flue gas and the vertical plane, so that the blowing air sprayed from the second blowing branch pipe 302 can continuously blow the dust entrained by the flue gas along the flowing direction of the flue gas, and simultaneously can blow the dust in the blowing range of the second blowing branch pipe 302, the deposition that is blown in this within range is smugglied secretly and flows by the flue gas equally, again through sweeping the aperture of the branch pipe 303 last orifice with the third and setting to become 25 degrees angles along the contained angle between flue gas flow direction and the vertical face to make from the third sweep all deposition that the branch pipe 303 spun sweeps the air and can continue to blow and be smugglied secretly by the flue gas along flue gas flow direction equally, can sweep the branch pipe 303 with the third simultaneously and sweep the within range deposition and blow, thereby be smugglied secretly and discharge along with the flue gas by the flue gas, and then reach the purpose of deashing.

Claims

1. The purging device of the low-temperature economizer is characterized by comprising a purging main pipe (1), a leading pipe (2) and 3 purging branch pipes (3), wherein one end of the purging main pipe (1) is connected with the leading pipe (2), the 3 purging branch pipes (3) are communicated with the purging main pipe (1) and are arranged in an inlet reducing flue (4), and spray holes (5) are formed in the 3 purging branch pipes (3); along the flow direction of flue gas, the caliber of a spray hole on the first purging branch pipe (301) is vertically downward, the distance d2 between the purging branch pipe closest to the low-temperature economizer body (6) and the low-temperature economizer body (6) is 200-500 mm, and the distance d3 between two adjacent purging branch pipes is 200-500 mm; the included angle between the caliber of the spray hole on the second purging branch pipe (302) and the vertical surface is 10 degrees; the included angle between the caliber of the spray hole on the third purging branch pipe (303) and the vertical surface is 25 degrees.

2. The purging device of the low-temperature economizer as claimed in claim 1, wherein the distance d1 between the 3 purging branch pipes (3) and the bottom of the inlet reducing flue (4) is 500-1000 mm.

3. The purging device of the low-temperature economizer as claimed in claim 2, wherein the distance d1 between the 3 purging branch pipes (3) and the bottom of the inlet reducing flue (4) is 800 mm.

4. The purging device of a low-temperature economizer as claimed in claim 1 or 2, wherein the distance d3 between two adjacent purging branch pipes is 300 mm.

5. The purging device for the low-temperature economizer according to claim 1 or 2, wherein the diameter of the spray hole is 5mm to 15 mm.

6. The purging device for a low-temperature economizer as claimed in claim 5, wherein the diameter of the nozzle hole is 8 mm.

7. The purging device of a low-temperature economizer according to claim 1 or 2, wherein the distance d2 between the purging branch pipe closest to the low-temperature economizer body (6) and the low-temperature economizer body (6) is 300 mm.