CN203744240U - Material supplementing type soot blower of circulating fluidized bed boiler - Google Patents

Abstract

The utility model discloses a material supplementing type soot blower of a circulating fluidized bed boiler. A superheater, a coal economizer and an air preheater in a flue at the tail part of the boiler are respectively provided with a set of soot blowers; each set of soot blower comprises an air storage tank; inlets of the three air storage tanks are respectively connected to an air compressor through respective pipelines; air is introduced into parts above the superheater, the coal economizer and the air preheater from outlets of the three air storage tanks through high pressure air tubes with spray nozzles; valves are arranged on the inlets and the outlets of the air storage tanks; material supplementing hoppers are arranged on the three high pressure air tubes. The design concept of the original soot blowers is changed from soot cleaning by means of external force to soot cleaning through increasing the kinetic energy of supplemented materials under the driving of high flow velocity flue gas, and washing the surfaces of the superheater, the coal economizer and the air preheater by larger-size materials.

Description

CFBB feed supplement formula soot blower

Technical field

The utility model relates to CFBB, relates in particular to the soot blower of recirculating fluidized bed pot.

Background technology

The most burning inferior coal of CFBB, flying dust amount is large, easily causes the boiler tail equipment dust stratification of (comprising superheater economizer, air preheater).The CFBB of the coal slime of particularly burning in recent years is constantly applied, and contains higher ash and moisture content in coal slime, makes boiler tail heat exchanger dust stratification problem more outstanding.Particle size of fly ash in tail flue gas is little, and the kinetic energy that flows is low is the main cause of boiler tail dust stratification.Can solve the dust stratification problem of boiler tail, become a key factor of restriction CFBB safety and economic operation.At afterbody, arrange that soot blower is a Main Means that solves collecting ash.Conventional soot blower has steam-type at present, sound wave type, and shock wave type high three major types, but these several soot blower investments are large, and operation maintenance difficulty, blows grey effect and has much room for improvement.

Summary of the invention

In order to overcome the deficiency of existing soot blower, the utility model designs a kind of CFBB feed supplement formula soot blower.

A kind of CFBB feed supplement formula soot blower, it is characterized in that, it is to be equipped with a set of soot blower on superheater, economizer and the air preheater at boiler back end ductwork, every cover soot blower comprises an air accumulator, the import of three air accumulators respectively pipeline by is separately connected on air compressor machine, and the outlet of three air accumulators is incorporated into superheater, economizer and air preheater top by the high-pressure air pipe with spray group by gas respectively; In the import and export of air accumulator, be equipped with valve, on three high-pressure air pipes, be equipped with feed supplement bucket;

Requiring the internal diameter of high-pressure air pipe is 25mm, and the internal diameter of the pipeline of air accumulator import is 50mm.

The compressed air pressure that above-mentioned air compressor machine produces is 0.5MPa.

Before use, in feed supplement bucket, add particle diameter 0.5-1mm granular material, as quartz sand, river sand, cinder etc.Operation principle is, the compressed air of the 0.5MP that air compressor machine produces enters in gas storage tank body through imported valve, and imported valve is closed reservoir pressure, then outlet valve is opened, gas moment ejection in air accumulator, the material that feed supplement bucket is bled in pipe blows, and by nozzle, is spread and is sprayed in boiler flue.Enter the material that fills in flue, under high speed flue gas drives, flow velocity increases kinetic energy raising, simultaneously because material proportion is larger, when a high position fills in vertical flue, has larger potential energy, becomes kinetic energy material speed is further improved in dropping process.In flue, swiftly flowing large particle diameter material and superheater, economizer and air preheater surface bump, and the dust stratification that is adsorbed on superheater, economizer and air preheater surface is washed away, and reach the object of deashing.

The utility model has changed the design concept of original soot blower, not to utilize external force to carry out deashing, but improve again by the flue gas of high flow rate the kinetic energy that fills into material, and utilize the material of greater particle size to wash away the surface of superheater, economizer and air preheater, reach the object of deashing.As long as regularly inflate in flue, can realize the removing of dust stratification, small investment, easy to operate, reliable, maintenance is few, energy saving, material is cheap; Can realize specific aim deashing is carried out in the position of different dust stratification degree by adjusting feed supplement kind and material particular diameter, guaranteed ash-removal effect.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of the utility model embodiment.

Marginal data, 1-superheater, 2-nozzle, 3-feed supplement bucket, 4a-pipeline, 4b-high-pressure air pipe, 5-outlet valve, 6-air accumulator, 7-imported valve, 8-air compressor machine, 9-economizer, 10-air preheater.

The specific embodiment

CFBB feed supplement formula soot blower as shown in Figure 1, it is to be equipped with a set of soot blower on superheater 1, economizer 9 and the air preheater 10 at boiler back end ductwork; Described soot blower comprises an air accumulator 6, the import of three air accumulators 6 respectively pipeline 4a by is separately connected on air compressor machine 8, and the outlet of three air accumulators 6 is incorporated into superheater 1, economizer 9 and air preheater 10 tops by the high-pressure air pipe 4b with spray group 2 by gas respectively; On the import and export of air accumulator 6, be respectively equipped with imported valve 7 and outlet valve 5, on three high-pressure air pipe 4b, be equipped with feed supplement bucket 3.Requiring the internal diameter of high-pressure air pipe 4b is 25mm, and pipeline 4a internal diameter is 50mm.The compressed air pressure that requires air compressor machine 8 to produce is 0.5MPa.

Claims (1)

1. a CFBB feed supplement formula soot blower, it is characterized in that, it is to be equipped with a set of soot blower on superheater, economizer and the air preheater at boiler back end ductwork, every cover soot blower includes an air accumulator, the import of three air accumulators respectively pipeline by is separately connected on air compressor machine, and the outlet of three air accumulators is incorporated into superheater, economizer and air preheater top by the high-pressure air pipe with spray group by gas respectively; In the import and export of air accumulator, be equipped with valve, on three high-pressure air pipes, be equipped with feed supplement bucket;

Requiring the internal diameter of high-pressure air pipe is 25mm, and the internal diameter of the pipeline of air accumulator import is 50mm;

The compressed air pressure that above-mentioned air compressor machine produces is 0.5MPa.