CN2337408Y

CN2337408Y - Directly-firing coal burner

Info

Publication number: CN2337408Y
Application number: CN 98216954
Authority: CN
Inventors: 韩剑峰
Original assignee: MUDANJIANG ELECTRIC POWER TECHNOLOGY INST
Current assignee: MUDANJIANG ELECTRIC POWER TECHNOLOGY INST
Priority date: 1998-07-10
Filing date: 1998-07-10
Publication date: 1999-09-08
Anticipated expiration: 2008-07-10

Abstract

The utility model relates to a directly-firing coal burner. A filter tank is arranged in an air pipe of the burner through an oil gun arranged in the air pipe of the burner and then is led to a stable burn body in an elliptical shape. A long axis of the stable burn body is arranged on a stub axis with a spout in an oval shape and the filter tank divides the cavity of an air pipe into two channels which are led to a thick side and a thin side of the spout. The utility model has the performances of deoiling, underloading and stable burning, the rate of bituminous coal and lean coal is respectively lower than or equal to 50%, the rate of the anthracite coal is lower than or equal to 60%, the rate of inferior coal is lower than or equal to 50% to 60%, the fuel saving rate of cold starting is larger than 70%, and the fuel saving rate is larger than 85% when the casting oil with low load is stably burnt.

Description

The direct-fired burner of coal dust

The utility model belongs to a kind of generating plant pulverized coal boiler device, relates to the direct-fired burner that a kind of pulverized-coal fired boiler is used specifically.

Make the direct current coal dust stablize " three high combustion districts " that steady burning must be organized high coal powder density, high temperature and an amount of hyperoxia concentration at DC burner spout place.Wherein high coal powder density is main.Because there is high coal powder density that high-volatile concentration and low ignition temperature are just arranged, and the fire burns heat release forms high temperature, promotes fugitive constituent to separate out with pulverized coal flame again and catches fire, and just makes pulverized coal flame have high steady combustion ability.

Organizing on the high coal powder density, coming out one after another with the shade type burning of dense-dilute burner combustion technology.Dense-dilute burner combustion technology be the breeze airflow in wind by variety of way, be divided into dense side and light side, light side enters back-fire side.Dense side high concentration pulverized coal needs ignition heat little favourable to catching fire, and obtains high temperature internal heat when going out spout and makes its burning; Light side then can be replenished required oxygen, improves the underload de-oiling and surely fires ability, reduces the NOX discharging.

After the WR of the U.S. entered China with the Japanese deep or light divergence type burner of PM, the shade burner of China was also come out one after another.As 89 years " variation coal powder density burner ", " coal powder burner " in 92 years belonged to the dense-dilute burner combustion technology class, but separating effect is relatively poor, and flow conductivity is not strong, and is identical with former igniting mode, and fuel savings oil is not obvious." the coal dust direct-fire burner " in 86 years-89 years is by refluxing after the bounce-back of anterior spout female cone body to breeze airflow, make coal dust and fogging oil mixed combustion, replace oil with coal, fuel savings oil, but there is not coal dust to separate enrichment facility, DeGrain aspect the de-oiling underload.

To be that design is a kind of collect shade burner and the direct burner of coal dust is the novel burner of one to the purpose of this utility model, can focus on the side of waring oneself in front of a fire to the coal dust of high concentration, and can when cold conditions opens stove, go out the spout incendivity by coal dust, make steady combustion of underload de-oiling and cold start save the direct-fired burner of coal dust that the fuel oil ability increases substantially.

For achieving the above object, technical solution of the present utility model is finished like this: the direct-fired burner of coal dust, spout by burner airduct middle front part endoluminal means ovalize, a built-in end is the combustion stabilizing body of elliptical cone shape, its longitudinal end places the spout minor axis location, and the cell body that is provided with baffle along the combustion stabilizing body rear portion is divided into the airduct inner chamber to lead to dense side and two passages of light side of spout; Go into an oil gun to combustion stabilizing body by aspiration channel center cell body interpolation, ecto-entad inclination insertion point firelock is distributed in square boiler body homonymy front-back wall to the burner that the combustion stabilizing body front end constitutes in light wing passage;

Be distributed in the burner airduct of another homonymy front-back wall of square boiler body, by the aft mounted baffle of cell body, and corresponding light crosswind inside pipe wall with the baffle inclined-plane is provided with the triangle guide way, and dense side spout rear end airduct is the guiding device that one section arch arc plate is formed.

The technical solution of the utility model also comprises: one time airduct elbow inwall tilts to be symmetrical arranged separate sheet, and becomes 10-20 ° of angle with center line; The angle of triangle baffle is 30-45 °.

The characteristics that the utility model compared with prior art has are: the direct-fired burner of coal dust has de-oiling low-load combustion-stabilizing ability bituminous coal, meager coal≤50%, anthracite≤60%, smut≤50-60%, cold start rate of economizing gasoline are more than 70%, and fuel-economizing reaches more than 85% during steady combustion of underload throwing oil; By installing separate sheet additional, in the time of can making breeze airflow through elbow the coal dust more than 90% is separated to the elbow outside, import the angle burner that dense side then enters distribution.

Description of drawings:

Fig. 1 is direct-fired burner structure schematic diagram.

Fig. 2 is the end view of Fig. 1.

Fig. 3 is Fig. 1 cross sectional view.

Fig. 4 is the guiding device schematic diagram.

Fig. 5 is the elbow cross-sectional view.

Shown in Fig. 1,2,3, the spout 5 that the ovalize arc plate that the direct-fired burner of coal dust is provided with by square airduct 1 500mm of Inner Front End portion section inner chamber is formed, be connected on the airduct 1 by the gusset that distributes, inserting a leading section in the spout 5 is oval-shaped cone combustion stabilizing body 6, sees Fig. 2.The longitudinal end of its combustion stabilizing body 6 is corresponding to the minor axis location place of ovalize spout 5, be provided with cell body 3 by spout 5 rear portions and along the lumen centers of airduct 1, the baffle 2 that gusset is fixed in the airduct 1 and afterbody installs additional by cell body 3 one sides, and airduct 1 inner chamber is separated into dense side and two passages of light side that lead to spout 5, see Fig. 3.By inserting an oil gun 4 in the cell body 3 to combustion stabilizing body 6, after connect oil supply system, constitute to combustion stabilizing body 6 front end 100mm places at light side ecto-entad inclination insertion point firelock 7, by airduct 9 of interface access of burner, with the front-back wall of burner arrangement at square boiler body homonymy.

Oval-shaped combustion stabilizing body 6 longitudinal end also can cooperate with the major axis position of the oval spout 5 of half-twist.

See Fig. 4, the baffle 12 that the afterbody of the cell body 3 of burner airduct 1 inner chamber setting installs additional is triangle, its angle is 30-45 °, by the guide way triangular in shape 8 of the parallel corresponding airduct 1 light wing passage setting in baffle 12 inclined-planes, and the burner that has guiding device is formed in corresponding dense crosswind pipe 1 to the rear end of spout 5 for the arch arc plate.

See Fig. 5, being tilted by the elbow inwall of an airduct 9 is symmetrically arranged with separate sheet 10, and becomes 10-20 degree angle with airduct 9 center lines.After entering burner, breeze airflow, makes that the pulverized coal particle more than 85% enters the side of waring oneself in front of a fire in the breeze airflow by bounce-back, the water conservancy diversion of baffle to pulverized coal particle.Air flow deflector turns round and form the recirculating zone behind combustion stabilizing body when making coal dust that enrichment crosses by combustion stabilizing body.Coal dust is injected behind the recirculating zone in the recirculating zone stagnation, deceleration, enrichment again, and at this moment required ignition heat spy is low, stable ignition effect when playing underload or burning inferior coal.The low breeze airflow of required ignition heat mixes with oil gun ejection fogging oil, thereby changed the coal dust characteristic, then burning torch is lighted fogging oil and the fusion of the coal dust of the characteristic of gaining fame and fortune, at this moment required ignition heat spy is little, along with the sending forth, expand of air-flow, formed that torch based on coal dust firing carries out ignition trigger and underload is thrown the steady combustion of oil with the combustion zone that catches fire.The required oxygen of aftercombustion when light side is injected the recirculating zone.Compare with former igniting mode during ignition start, significantly fuel savings oil.Can make boiler increase peak modulation capacity, save fuel oil, improve safety in operation, and can make enterprise obtain high economic benefit.

Claims

1, the direct-fired burner of coal dust, the oil gun that comprises burner airduct and interior installation thereof causes combustion stabilizing body and inserts in the spout, it is characterized in that, described combustion stabilizing body (6) cone leading section is oval, the spout that is arranged at ovalize (5) minor axis location of its longitudinal end, be provided with the cell body (3) of baffle (2) along combustion stabilizing body (6) rear portion, dense side and two passages of light side of airduct (1) inner chamber being separated into lead to spout, insert oil gun (4) in the cell body (3) to combustion stabilizing body (6), to combustion stabilizing body (6) front end, be distributed in square boiler body homonymy front-back wall at light side ecto-entad inclination insertion point firelock (7);

Be distributed in the burner airduct (1) of this another homonymy front-back wall of angle boiler body, the corresponding light crosswind inside pipe wall in inclined-plane by the aft mounted baffle of cell body (3) (12) is provided with guide way (8), and spout rear end airduct is that one section arch arc plate is formed guiding device.

2, by the described burner of claim 1, it is characterized in that described guide way (12) is a triangle, its angle is 30-45 °.

3, by the described burner of claim 1, it is characterized in that a described airduct (9) elbow inwall tilts to be symmetrical arranged separate sheet (10), and with the center line angle be 10-20 °.