CN103759279A

CN103759279A - Soot blowing system of coal-fired boiler heating surface

Info

Publication number: CN103759279A
Application number: CN201410055945.3A
Authority: CN
Inventors: 刘建华; 武卫红; 邢秀峰; 史晓华; 李凯勇; 刘众元; 武晓俊
Original assignee: State Grid Corp of China SGCC; Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd
Current assignee: State Grid Corp of China SGCC; Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd
Priority date: 2014-02-19
Filing date: 2014-02-19
Publication date: 2014-04-30

Abstract

The invention discloses a soot blowing system of a coal-fired boiler heating surface. The soot blowing system solves the problem that an existing soot blowing method achieved by means of steam wastes a large amount of steam. The soot blowing system comprises a smoke compressor (4) and a desulfurizer (11), wherein a smoke exhaust port of a coal-fired boiler (1) is communicated with an inlet of a deduster (2), an outlet of the deduster (2) is communicated with an inlet of an induced draft fan (3), an outlet of the induced draft fan (3) is communicated with the first port of a tee (7), the third port of the tee (7) is communicated with an inlet of the smoke compressor (4) through a smoke exhaust bypass valve (8), an outlet of the smoke compressor (4) is communicated with a soot blowing device (6) arranged in the coal-fired boiler (1) through an electric control valve (5), and the soot blowing device (6) is provided with a soot blowing pressure measuring device (10) which is electrically connected with a valve adjustment drive device (9) arranged on the electric control valve (5). Coal consumption is reduced, and energy conservation and emission reduction are achieved by means of improvement of the utilization rate of energy.

Description

A kind of heating surface of coal-fired boiler soot blower system

Technical field

The present invention relates to a kind of soot blower system of heating surface of coal-fired boiler, particularly a kind of low-temperature flue gas that utilizes blows grey system to boiler heating surface.

Background technology

The dust stratification of boiler heating surface and coking meeting affect the heat transfer efficiency of heating surface, make exhaust gas temperature increase, and cause the thermal efficiency of boiler to decline.Theoretical calculating and operating experience show: exhaust gas temperature raises 20 ℃, and boiler thermal output will decline 1%.In addition, serious dust stratification or the knot of boiler heating surface, can cause the corrosion of boiler heating surface, causes the unexpected of boiler operatiopn to be stopped work, and causes great economic loss.For a long time, the ash disposal problem of boiler heating surface is one of problem receiving much concern in boiler operatiopn always.Prior art is by the generation that ash is avoided dust stratification and coking phenomenon of blowing to boiler heating surface, and adopting maximum is Steam Soot-Blower System.Steam soot blowing is mainly the purging effect that utilizes high steam, remove dust stratification and the slagging scorification of heating surface, its advantage be technology more ripe, blow ash the used time short, effective, but also there are a lot of unsurmountable shortcomings in steam soot blowing: (1) causes the water capacity in smoke evacuation to increase, boiler exhaust gas loss increases, also make flue gas dew point temperature improve, the corrosion of aggravation back-end surfaces.(2) while blowing ash, need to expend a large amount of steam, the quantity of steam of steam soot blowing consumption accounts for the 0.5%-1% of boiler duty, causes boiler water-filling and water treatment facilities expense to increase, and causes a large amount of waste of steam.

Summary of the invention

The invention provides a kind of heating surface of coal-fired boiler soot blower system, the boiler heating surface that makes that has solved existing steam soot blowing existence easily corrodes and causes the technical problem of a large amount of waste of steam.

The present invention solves above technical problem by the following technical programs:

A kind of heating surface of coal-fired boiler soot blower system, comprise the coal-burning boiler being connected with steam turbine generator, deduster, booster fan, flue gas compressor and desulfurizer, the exhaust opening of coal-burning boiler is communicated with the entrance of deduster, the outlet of deduster is communicated with the entrance of air-introduced machine, the outlet of air-introduced machine is communicated with the first interface of threeway, on the second interface of threeway, be connected with desulfurizer, in the outlet of desulfurizer, be connected with boiler chimney, the 3rd interface of threeway is communicated with the entrance of flue gas compressor by smoke evacuation bypass valve, the outlet of flue gas compressor is communicated with the soot blower being arranged in coal-burning boiler by electrically-controlled valve, on soot blower, be provided with blowing pressure measurement mechanism, blowing pressure measurement mechanism is electrically connected with the valve regulated drive unit being arranged in electrically-controlled valve.

Described air-introduced machine is booster fan.

The present invention has overcome the shortcoming that existing steam blowing technique is wasted a large amount of steam; Take full advantage of fume afterheat and the overbottom pressure of power plant, and flue-gas temperature is higher, does not affect flue gas loss.Improved unit efficiency, reduced coal consumption, the utilization rate that improves the energy realizes energy-saving and emission-reduction, has considerable economic benefit.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention.

The specific embodiment

Below in conjunction with accompanying drawing, the present invention is described in detail:

A kind of heating surface of coal-fired boiler soot blower system, comprise the coal-burning boiler 1 being connected with steam turbine generator 13, deduster 2, booster fan 3, flue gas compressor 4 and desulfurizer 11, the exhaust opening of coal-burning boiler 1 is communicated with the entrance of deduster 2, the outlet of deduster 2 is communicated with the entrance of air-introduced machine 3, the outlet of air-introduced machine 3 is communicated with the first interface of threeway 7, on the second interface of threeway 7, be connected with desulfurizer 11, in the outlet of desulfurizer 11, be connected with boiler chimney 12, the 3rd interface of threeway 7 is communicated with the entrance of flue gas compressor 4 by smoke evacuation bypass valve 8, the outlet of flue gas compressor 4 is communicated with the soot blower 6 being arranged in coal-burning boiler 1 by electrically-controlled valve 5, on soot blower 6, be provided with blowing pressure measurement mechanism 10, blowing pressure measurement mechanism 10 is electrically connected with the valve regulated drive unit 9 being arranged in electrically-controlled valve 5.

Described air-introduced machine 3 is booster fan.

Deduster 2 is used for boiler smoke to carry out dedusting, removes the most dust in flue gas; Flue gas compressor 4 is used for improving the pressure of flue gas, has guaranteed that the flue gas that enters soot blower has sufficiently high pressure; Electrically-controlled valve 5 is adjustable gate, when valve opening changes, flue gas pressures changes thereupon, when adapting to changing load to blowing the requirement of grey flue gas pressures, valve regulated drive unit 9 in electrically-controlled valve 5 is accepted the grey atmospheric pressure signal that blows measuring from the blowing pressure measurement mechanism 10 on soot blower 6, according to the size of this signal controlling valve aperture.Smoke evacuation bypass valve 8 can be opened when flue gas blows ash, and flue gas enters air compressor, blows ash, closes not needing to blow in grey, and flue gas enters chimney by desulfurizer and enters in atmosphere.

Claims

1. a heating surface of coal-fired boiler soot blower system, comprise the coal-burning boiler (1) being connected with steam turbine generator (13), deduster (2), booster fan (3), flue gas compressor (4) and desulfurizer (11), it is characterized in that, the exhaust opening of coal-burning boiler (1) is communicated with the entrance of deduster (2), the outlet of deduster (2) is communicated with the entrance of air-introduced machine (3), the outlet of air-introduced machine (3) is communicated with the first interface of threeway (7), on the second interface of threeway (7), be connected with desulfurizer (11), in the outlet of desulfurizer (11), be connected with boiler chimney (12), the 3rd interface of threeway (7) is communicated with the entrance of flue gas compressor (4) by smoke evacuation bypass valve (8), the outlet of flue gas compressor (4) is communicated with the soot blower (6) being arranged in coal-burning boiler (1) by electrically-controlled valve (5), on soot blower (6), be provided with blowing pressure measurement mechanism (10), blowing pressure measurement mechanism (10) is electrically connected with the valve regulated drive unit (9) being arranged in electrically-controlled valve (5).

2. a kind of heating surface of coal-fired boiler soot blower system according to claim 1, is characterized in that, described air-introduced machine (3) is booster fan.