CN-117190217-B - Soot blowing system for secondary air box of boiler

CN117190217BCN 117190217 BCN117190217 BCN 117190217BCN-117190217-B

Abstract

The invention relates to a soot blowing system for a boiler secondary air box, which comprises a soot blowing main pipe, at least one connecting pipe, a soot blowing group and a soot blowing group, wherein the at least one connecting pipe is arranged at intervals along the length direction of the air box, one end of the connecting pipe is communicated with the soot blowing main pipe, the other end of the connecting pipe stretches into the air box, the soot blowing group corresponding to the connecting pipe comprises a first soot blowing pipe and a second soot blowing pipe, the first soot blowing pipe and the second soot blowing pipe are communicated with the connecting pipe and extend along the length direction of the air box, the first soot blowing pipes are arranged at intervals along the width direction of the air box and are arranged on the bottom wall of the air box, the second soot blowing pipe is arranged on the air box and is positioned on one side, away from the bottom wall of the air box, of the first soot blowing pipe is communicated with a plurality of first soot blowing pieces, the second soot blowing pipes are communicated with a plurality of second soot blowing pieces, and the plurality of first soot blowing pieces and the second soot blowing pieces are arranged at intervals along the length direction and are used for blowing dust in the air box. Through the technical scheme, the soot blowing system for the boiler secondary air box can timely clean dust in the air box.

Inventors

HU XIAOPING
ZHOU SEN
GAO HONG
YU PENG
WANG ZHONGHUA
ZHANG JU

Assignees

国能重庆万州电力有限责任公司
北京中电慧能国际电力科技有限公司

Dates

Publication Date: 20260508
Application Date: 20230824

Claims (9)

1. A sootblowing system for a boiler secondary air box, the sootblowing system for a boiler secondary air box comprising: the soot blowing main pipe is used for circulating soot blowing media; At least one connecting pipe, at least one connecting pipe is distributed along the length direction of the bellows at intervals, one end of the connecting pipe is communicated with the soot blowing parent pipe, the other end of the connecting pipe penetrates through the side wall of the bellows and stretches into the bellows, and The number of the soot blowing groups is equal to that of the connecting pipes and the soot blowing groups are arranged in a one-to-one correspondence manner, each soot blowing group comprises a first soot blowing pipe and a second soot blowing pipe, one end of one of the first soot blowing pipes is communicated with the connecting pipe and extends along the length direction of the bellows, the number of the first soot blowing pipes is a plurality of the first soot blowing pipes which are arranged on the bottom wall of the bellows at intervals along the width direction of the bellows, the second soot blowing pipes are arranged on the bellows and are positioned on one side, away from the bottom wall of the bellows, of the first soot blowing pipes, each soot blowing group comprises a communicating pipe and two first soot blowing pipes, one end of one of the first soot blowing pipes is communicated with the connecting pipe, the other end of the first soot blowing pipe is communicated with the other first soot blowing pipe through the communicating pipe, the two first soot blowing pipes are arranged on the bottom wall of the bellows at intervals, and the second soot blowing pipes are arranged on the top wall of the bellows at equal distances from the two first soot blowing pipes; The first soot blowing pipe is communicated with a plurality of first soot blowing pieces, the second soot blowing pipe is communicated with a plurality of second soot blowing pieces, and the first soot blowing pieces and the second soot blowing pieces are distributed at intervals along the length direction of the bellows and are used for blowing dust in the bellows; the first soot blowing piece is constructed as a disk type soot blower or a first wide-angle soot blower, a plurality of acoustic soot blowers are communicated with the second soot blowing pipe, and two second wide-angle soot blowers are arranged between any two adjacent acoustic soot blowers at intervals.
2. The sootblowing system for a boiler secondary air box of claim 1 wherein said second lance tube is spaced from said bottom wall of said box by a distance of 0.4m to 0.6m.
3. The sootblowing system for a boiler secondary air box of claim 1, wherein a side of said first lance tube facing away from said box sidewall is provided with a plurality of said first wide angle sootblowers, or A plurality of first wide-angle soot blowers are respectively arranged on two opposite sides of the first soot blowing pipe.
4. The sootblowing system for a boiler secondary air box of claim 1 wherein said first lance tube is provided with a plurality of said disk sootblowers on a side thereof facing away from said bottom wall of said box.
5. The sootblowing system for a secondary air box of a boiler according to any of claims 1-4, wherein a spacing between two adjacent connection pipes is 3 m-5 m.
6. The sootblowing system for a boiler secondary air box of claim 5 further comprising an air storage tank, a first pressure gauge and a second pressure gauge, wherein an air inlet of the air storage tank is communicated with a sootblowing medium source through an air inlet pipe, an air outlet of the air storage tank is communicated with the sootblowing main pipe, the first pressure gauge is used for detecting the pressure of the air storage tank, and the second pressure gauge is used for detecting the pressure in the sootblowing main pipe.
7. The sootblowing system for a boiler secondary air box of claim 6 wherein said air inlet duct is provided with first and second manual valves spaced apart along an extension direction of said air inlet duct.
8. The sootblowing system for a boiler secondary air box of claim 5 wherein said sootblowing main is provided with a third manual valve and a first solenoid valve, said third manual valve and said first solenoid valve being spaced apart along the extension of said sootblowing main, one second solenoid valve being provided on each of said connection pipes.
9. The sootblowing system for a boiler overgrate air box of claim 6 wherein said air storage tank is externally connected by a first drain valve and said sootblowing main is externally connected by a second drain valve.

Description

Soot blowing system for secondary air box of boiler Technical Field The disclosure relates to the technical field of ash removal of bellows, in particular to an ash-blowing system for a secondary air box of a boiler. Background After the secondary air box and the ashed air box of the power plant are used for a period of time, a lot of dust can be accumulated in the air box, the thickness of part accumulated dust can even reach 1.5 meters, the accumulated dust can influence the airflow circulation condition in the air box, so that part of circulation channels of the secondary air are blocked, the secondary air quantity entering a hearth is insufficient, the secondary air cannot be fully mixed with pulverized coal airflow, the pulverized coal is further combusted insufficiently, and the efficiency of a boiler is reduced. In addition, the weight of the bellows can be increased due to excessive accumulated ash, so that the bellows is unstable in structure, and potential safety hazards are increased. Therefore, the dust deposit in the bellows needs to be cleaned regularly, at present, the bellows is cleaned by mainly opening the bellows by using the opportunity of the boiler for shutdown maintenance, and the bellows is cleaned manually, so that the cleaning mode is not only required to consume a large amount of manpower, material resources and financial resources, but also is easy to cause personal safety accidents and harm health, and in addition, the cleaning time is limited by the time of the boiler for shutdown maintenance, so that the dust deposit cannot be cleaned timely. Disclosure of Invention An object of the present disclosure is to provide a soot blowing system for a boiler secondary air box, which is capable of cleaning dust in a wind box in time. In order to achieve the aim, the disclosure provides a soot blowing system for a boiler secondary air box, which comprises a soot blowing mother pipe, at least one connecting pipe, a soot blowing group and a soot blowing group, wherein the soot blowing mother pipe is used for enabling soot blowing media to circulate, one end of the connecting pipe is communicated with the soot blowing mother pipe, the other end of the connecting pipe penetrates through the side wall of the bellows and stretches into the bellows, the soot blowing group is equal to the connecting pipe in number and corresponds to the connecting pipe one by one, the soot blowing group comprises a first soot blowing pipe and a second soot blowing pipe, the first soot blowing pipe and the second soot blowing pipe are respectively communicated with the connecting pipe and extend along the length direction of the bellows, the first soot blowing pipe is a plurality of first soot blowing pipes are arranged on the bottom wall of the bellows at intervals along the width direction of the bellows, the second soot blowing pipe is arranged on one side of the first soot blowing pipe, which is far away from the bottom wall of the bellows, the first soot blowing pipe is communicated with the soot blowing member, and the second soot blowing pipe is communicated with the soot blowing member, and the soot blowing member is communicated with the soot blowing member. Optionally, each group of soot blowing groups includes a communicating pipe and two first soot blowing pipes, wherein one end of each first soot blowing pipe is communicated with the connecting pipe, the other end of each first soot blowing pipe is communicated with the other first soot blowing pipe through the communicating pipe, the two first soot blowing pipes are installed on the bottom wall of the bellows and are oppositely arranged, the second soot blowing pipes are installed on the top wall of the bellows, and the distances between the second soot blowing pipes and the two first soot blowing pipes are equal. Optionally, the distance between the second ash blowing pipe and the bottom wall of the air box is 0.4 m-0.6 m. Optionally, the first soot blower is configured as a disk soot blower or a first wide angle soot blower, and the second soot blower is configured as a second wide angle soot blower or an acoustic soot blower. Optionally, a plurality of first wide-angle soot blowers are arranged on one side, away from the side wall of the bellows, of the first soot blowing pipe, or a plurality of first wide-angle soot blowers are respectively arranged on two opposite sides of the first soot blowing pipe. Optionally, a plurality of disk soot blowers are arranged on one side of the first soot blowing pipe, which faces away from the bottom wall of the wind box. Optionally, the second soot blower is communicated with a plurality of acoustic soot blowers, and two second wide-angle soot blowers are arranged between any two adjacent acoustic soot blowers at intervals. Optionally, the distance between two adjacent connecting pipes is 3 m-5 m. Optionally, the soot blowing system for the boiler secondary air box further comprises an air storage tank, a firs