CN101986031B

CN101986031B - Returning charge system for straw boiler

Info

Publication number: CN101986031B
Application number: CN2010105627270A
Authority: CN
Inventors: 宣炎明; 蔡红伟; 张建平; 蔡永祥; 褚福亮
Original assignee: Nantong Wanda Boiler Co Ltd
Current assignee: Nantong Wanda Energy Power Technology Co ltd
Priority date: 2010-11-29
Filing date: 2010-11-29
Publication date: 2012-05-23
Anticipated expiration: 2030-11-29
Also published as: CN101986031A

Abstract

The invention discloses a returning charge system for a straw boiler, which is characterized in that secondary hot air from an outlet of an air preheater enters into a returning charge stand pipe through a circular air duct, an oblique air duct and four inflation inlets which are arranged uniformly on the returning charge stand pipe, and controls the amount of the air flow through a power-driven ventilation door and a flow meter, thereby regulating the cycling ash amount. The invention has the advantages that the returning charge system for a straw boiler guarantees the smoothness of the material cycling system, stabilizes the furnace box temperature, and prolongs the safety and continuous operation period of a recirculating fluidized bed biomass boiler through controlling the cycling ash amount in the returning charge system.

Description

The revert system of straw boiler

Technical field:

The present invention relates to the returning charge control system of a kind of stalks boiler fuel burning back material and circulating ash quantity.

Background technology:

The recirculating fluidized bed straw boiler obtained fast development in recent years, but the not smooth problem of recirculating fluidized bed straw boiler ubiquity revert system.Main cause has: straw burning back ash melting point is very low, is example with straw, straw, and general ash fusion point temperature is about 750 ℃; Simultaneously owing to contain the potassium of high concentration in the stalk; Contain the potassium material and separate out easily, in combustion process, if ignition temperature is too high; Deposition is gathered group in material returning device easily, causes boiler circulatory system to block.Though present most of recirculating fluidized bed biomass boiler adopts low-temperature burning, middle temperature unpack format; Be beneficial to and alleviate alkali metal and cause flying dust to gather group and the revert system that causes is not smooth; But in practical application, still often occur owing to ignition temperature is difficult to control the stifled grey problem that overtemperature brings.On the other hand, actual outer dust-carrying capacity is a lot of in the biomass fuel, is example with the rice husk; The impurity of except rice husk is in transportation and process, bringing into, a large amount of rice chaff of itself carrying in addition are in the boiler actual motion; Very big like outer dust-carrying capacity; Make the circulating ash quantity of revert system be far longer than design load, be prone to cause revert system to block, the fluctuation of burner hearth bed temperature.Present conventional way is that the ash-removing valve of opening material returning device is put ash, because the ash amount that puts down is very big, manual work is difficult in time clean out, and making the boiler room is dust everywhere, the non-constant of working environment.

Summary of the invention:

Thereby the object of the present invention is to provide a kind of returning charge control system that regulates circulating ash quantity through MOD and flowmeter control air quantity size.

Technical solution of the present invention is: the secondary hot-air from the air preheater outlet gets into the returning charge standpipe through four inflation inlets evenly arranging on hoop airduct, skew wind pipe and the returning charge standpipe, and regulates circulating ash quantity through MOD and flowmeter control air quantity size.This returning charge control system closes at ordinary times; Only under scenario, open: when the material overtemperature in the returning charge standpipe; Open MOD; Secondary hot-air sprays into the returning charge standpipe at a high speed from inflation inlet, plays and reduces circulating ash quantity and circulating ash quantity is had perturbation action, gathers the obstruction that group causes thereby alleviate because of alkali metal causes flying dust; When circulating ash quantity causes the fluctuation of burner hearth bed temperature too much, open MOD, make and form one air curtain in the returning charge standpipe; Reduce circulating ash quantity; Thereby set up new material balance, make fire box temperature keep stable, and do not need to put ash control fire box temperature through ash-removing valve.

Part about the straw boiler revert system divides comprises returning charge standpipe, hoop airduct, airduct, inflation inlet, returning charge casing, inspection door, blast cap and bellows etc.

Beneficial effect of the present invention: the circulating ash quantity through in the control revert system, guaranteed the unimpeded of material circulating system, stablized fire box temperature, the cycle of prolonged recirculating fluidized bed biomass boiler safety, moving continuously.

Description of drawings:

Below in conjunction with accompanying drawing and embodiment the present invention is described further.

Fig. 1 is the configuration diagram of one embodiment of the invention.

Fig. 2 is the A-A diagrammatic sketch of Fig. 1.

Fig. 3 is a revert system air distribution control chart.

The specific embodiment:

Part about a kind of revert system of straw boiler divides; Wherein hoop airduct 1 is weldingly connected with skew wind pipe 2; Skew wind pipe 2 inserts inflation inlet 3, and skew wind pipe 2 is weldingly connected with returning charge standpipe 4, and returning charge casing 5 is cast in the inboard of returning charge standpipe 4; Inspection door 6, blast cap 7, bellows 8 are weldingly connected with returning charge standpipe 4 respectively, and warm-air pipe 9 is weldingly connected with hoop airduct 1.

Native system secondary hot-air flow process is: open MOD 11; Secondary hot-air 10 at a high speed sprays into returning charge standpipe 4 through hoop airduct 1, skew wind pipe 2 with inflation inlet 3 through warm-air pipe 9; And, also can control the parameter of secondary hot-air through valve 13 and Pressure gauge 14 through MOD 11 and flowmeter 12 control air quantity sizes.

Claims

1. the revert system of a straw boiler; Part about dividing; Comprise returning charge standpipe, returning charge casing, inspection door, blast cap and bellows respectively, it is characterized in that: also comprise warm-air pipe, hoop airduct, skew wind pipe, inflation inlet, wherein warm-air pipe and hoop airduct are weldingly connected; Hoop airduct and skew wind pipe are weldingly connected; The other end of skew wind pipe inserts the inflation inlet in the returning charge standpipe, and is weldingly connected with the returning charge standpipe, and MOD, flowmeter, valve and Pressure gauge are housed on the warm-air pipe; Spray into the returning charge standpipe at a high speed through four inflation inlets evenly arranging on hoop airduct, skew wind pipe and the returning charge standpipe from the secondary hot-air of air preheater outlet successively after through warm-air pipe, thereby and through MOD and the big or small adjusting of flowmeter control air quantity circulating ash quantity.

2. the revert system of straw boiler according to claim 1; It is characterized in that: when the material overtemperature in the returning charge standpipe; Open MOD; Secondary hot-air sprays into the returning charge standpipe at a high speed from inflation inlet, plays and reduces circulating ash quantity and circulating ash quantity is had perturbation action, gathers the obstruction that group causes thereby alleviate because of alkali metal causes flying dust.

3. the revert system of straw boiler according to claim 1; It is characterized in that: when circulating ash quantity causes the fluctuation of burner hearth bed temperature too much, open MOD, make and form one air curtain in the returning charge standpipe; Reduce circulating ash quantity; Thereby set up new material balance, make fire box temperature keep stable, and need not to put ash control fire box temperature through ash-removing valve.