CN201177258Y

CN201177258Y - Gas ignited pulverized-coal burner

Info

Publication number: CN201177258Y
Application number: CNU2008200786620U
Authority: CN
Inventors: 付忠广; 史亮亮
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-01-22
Filing date: 2008-01-22
Publication date: 2009-01-07
Anticipated expiration: 2018-01-22

Abstract

The utility model discloses a fuel gas igniting coal dust burner, comprising a housing which is internally provided with a plurality of stages of combustion chamber, wherein a primary combustion chamber is provided evenly with at least two fuel gas igniters on the upper edge in the circumferential direction, each fuel gas igniter is formed by an igniting chamber and a jet exhauster which comprises a gas guide plate, each igniting chamber is intersected and fixed slantingly with the same angle of inclination of the primary combustion chamber so that the high temperature air stream generated by burning the fuel gas igniter is guided into the primary combustion chamber slantingly and the high temperature air streams are matched mutually to form a rotating air stream in the primary combustion chamber. Compared with the prior burner, the coal dust burner does not need to consume fuel completely and only consumes a small amount of fuel gas, thereby having the advantages of economy, environmental protection and safety. The fuel gas igniting coal dust burner in operation can keep the aerodynamic force property in the prior furnace, is safe and reliable, has simple and feasible operation and maintenance, and wide application range of coal kinks, and is convenient for the oil saving reconstruction of unidirectional flow and rotational flow burners in the coal dust furnace.

Description

The gas ignition coal burner

Technical field

The utility model relates to a kind of coal burner, especially a kind of gas ignition coal burner.

Background technology

At present, the mode that adopts fuel oil to light of the coal burner in thermal power plant's engineering reality more.Fig. 1 is the structural representation of the wider micro-oil ignition coal powder combusting device of current application.Its oil inflame chamber 1 is directly vertical the insertion in the one-level combustion chamber 2, meeting in service causes one-level combustion chamber 2 lower wall surface temperature height, while is owing to the oily flame of high speed washing away, pulverized coal particle is obstructed in flowing, and easily causes the bottom accumulated powder, and then causes coking, so ignition energy herein can not be too big, often need install bigger auxiliary oil gun additional, assist and finish further burning, even but can not solve this defective fully like this at one-level combustor exit place.For this reason, people attempt to be provided with by bilateral symmetry about burner the mode of two oil ignitors, eliminate igniter asymmetric existing defective is set.But after adopting this being symmetrical arranged, the coal dust of higher concentration has still been built up in horizontal direction both sides, one-level combustion chamber, a large amount of coal dusts do not enter the high temperature gas flow core, and the fugitive constituent quantity that causes coal dust totally to separate out reduces, and bring adverse effect for the subsequent combustion of coal dust.

What is more important, this fuel ignition coal burner can consume great amount of fuel oil when work.According to statistics, the 125MW unit boiler starts once needs 15 tons of oil consumptions, and the 200MW unit starting once needs 50 tons of oil consumptions, and 600MW unit boiler igniting and combustion-supporting fuel oil are above 300 tons.Scarcity with respect to the China's oil resource, there are problems in high resource consumption like this, and continuous expansion along with China's city size, some thermal power plants that originally are positioned at suburbs are now surrounded by the city gradually, for environmental protection and safety requirements, these power plant fuel oil that should not burn produces a large amount of pernicious gases and keeps large-scale oil storage tank.Because gaseous fuels such as liquefied gas and natural gas are higher in China's city popularity rate, so these in the urban district and the thermal power plant of periphery be not subjected to the restriction of gaseous fuel preservation condition and transport condition, and fuel oil adopts the gas fuel combustion igniting to have more economical relatively, more environmental protection, therefore advantage such as safer is promoted the gas fuel combustion firing technique and is had realistic meaning in the type power plant.

The utility model content

At the problem that prior art exists, the purpose of this utility model is to provide a kind of gas ignition coal burner.

For achieving the above object, a kind of gas ignition coal burner of the utility model comprises housing, be provided with some grades of combustion chambers in the housing, wherein upper edge, one-level combustion chamber circumferentially is evenly equipped with at least two gas igniters, each gas igniter constitutes by igniting chamber and injector, this injector comprises an aeroscopic plate, each igniting chamber is all fixed with the inclination angle and oblique the intersecting of one-level combustion chamber of unanimity, the high temperature gas flow that the burning of each gas igniter produces is all by along in the oblique importing one-level combustion chamber, and complements each other to form swirling eddy in the one-level combustion chamber.

Further, described aeroscopic plate is the slab construction that is evenly equipped with through hole.

Further, described each igniting chamber all is fixedly mounted on the same section of described one-level combustion chamber, and each igniting chamber is all to the circumferential lopsidedness in one-level combustion chamber.

Further, described each igniting chamber also all tilts to described one-level combustion chamber updrift side.

Further, be provided with three grades of combustion chambers in the described housing, all interconnect between each combustion chamber by the ribs frame, and whole three grades of combustion chambers are supported and fixed on the inner walls by the ribs frame on one-level and the three grades of combustion chambers, upstream inner walls near the one-level combustion chamber is provided with the diminishing Pulverized Coal Concentration structure of internal diameter, also is provided with the diminishing steady flame structure of internal diameter on the inwall of third level combustion chamber.

The utility model coal burner is compared with traditional burner, does not need fuel consumption fully, only consumes a spot of combustion gas, thereby can reach advantages such as economic, environmental protection, safety.In service can keep original furnace air dynamic characteristics, safe and reliable, Operation and Maintenance is simple, it is wide that coal adapts to width.And be convenient to the fuel-economizing transformation of coal-powder boiler direct current, turbulent burner.

Description of drawings

Fig. 1 is the existing igniting pulverized coal burner structural representation of the utility model;

Fig. 2 is a coal powder point firearm structure cutaway view;

Fig. 3 be among Fig. 2 A to cutaway view.

The specific embodiment

As shown in Figure 2, be provided with one, two, three totally three grades of

combustion chambers

2,3,4 in the utility model gas ignition coal burner housing 1, all interconnect between each combustion chamber by ribs frame 9, and whole three grades of combustion chambers are supported and fixed on housing 1 inwall by the

ribs frame

8,10 on one-level and the three grades of combustion chambers, upstream inner walls near one-level combustion chamber 2 is provided with the diminishing Pulverized Coal Concentration structure 7 of internal diameter, and the inwall of third level combustion chamber 4 is provided with the diminishing steady flame structure 11 of internal diameter.2 upper edges, one-level combustion chamber circumferentially are evenly equipped with two gas igniters 12, each gas igniter 12 constitutes by injector 6 and igniting chamber 5, the junction of injector 6 and igniting chamber 5 is provided with aeroscopic plate 61, aeroscopic plate 61 is for being evenly equipped with the slab construction of through hole 611, combustion gas can evenly import in the igniting chambers 5 by through hole 611, the scouring force of flame when reducing gas combustion.Each igniting chamber 5 all is fixedly mounted on the same section of one-level combustion chamber 2, and each igniting chamber 5 is except all to the 2 circumferential lopsidedness of one-level combustion chamber, also simultaneously all to the updrift side inclination of one-level combustion chamber 2.

During work; after the primary wind and powder mixture enters housing 1 (airduct); concentrate through Pulverized Coal Concentration device 7; dense light breeze airflow all around in the middle of forming; dense breeze airflow enters one-level combustion chamber 2; the annular passage of light breeze airflow outside one-level combustion chamber 2 enters two, three grades of

combustion chambers

3,4 successively, realizes fractional combustion on the one hand, forms cooling air film protection combustion chamber wall surface at combustion chambers at different levels inwall on the other hand.High-pressure gas passes to fair speed and enters gas igniter 12, entrainments surrounding air simultaneously, carries out the mixing of speed and concentration in injector 6.Under situation about fully mixing, mist evenly imports in the igniting chamber 5 by aeroscopic plate 61.Mist conflagration after lighting a fire, the high-temperature gas that burning produces, flame is along oblique importing one-level combustion chamber 2, and complements each other to form the high temperature gas flow that tiltedly revolves in one-level combustion chamber 2.Form air gap in the middle of the high temperature gas flow that tiltedly revolves, make the breeze airflow of high concentration enter high temperature gas flow (fire nuclear) unimpededly, and fully mix, thereby make pulverized coal particle fast pyrogenation, burning with high temperature gas flow.The combustion product of one-level combustion chamber 2 and combustible enter two, three grades of combustion chambers more successively, realize the fractional combustion that energy amplifies step by step.Breeze airflow in the final combustion enters burner hearth from the spout of housing 1 (airduct), realizes the stove internal combustion.

Claims

1, a kind of gas ignition coal burner comprises housing, it is characterized in that, be provided with some grades of combustion chambers in the described housing, wherein upper edge, one-level combustion chamber circumferentially is evenly equipped with at least two gas igniters, each gas igniter constitutes by igniting chamber and injector, this injector comprises an aeroscopic plate, each igniting chamber is all fixed with the inclination angle and oblique the intersecting of one-level combustion chamber of unanimity, make high temperature gas flow that the burning of each gas igniter produces all along in the oblique importing one-level combustion chamber, and in the one-level combustion chamber, complement each other to form swirling eddy.

2, gas ignition coal burner as claimed in claim 1 is characterized in that, described aeroscopic plate is the slab construction that is evenly equipped with through hole.

3, gas ignition coal burner as claimed in claim 1 is characterized in that, described each igniting chamber all is fixedly mounted on the same section of described one-level combustion chamber, and each igniting chamber is all to the circumferential lopsidedness in one-level combustion chamber.

4, gas ignition coal burner as claimed in claim 1 is characterized in that, described each igniting chamber also all tilts to described one-level combustion chamber updrift side.

5, gas ignition coal burner as claimed in claim 1, it is characterized in that, be provided with three grades of combustion chambers in the described housing, all interconnect between each combustion chamber by the ribs frame, and whole three grades of combustion chambers are supported and fixed on the inner walls by the ribs frame on one-level and the three grades of combustion chambers, upstream inner walls near the one-level combustion chamber is provided with the diminishing Pulverized Coal Concentration structure of internal diameter, also is provided with the diminishing steady flame structure of internal diameter on the inwall of third level combustion chamber.