CN2646575Y

CN2646575Y - DC burner ignition device of pulverized coal firing boiler

Info

Publication number: CN2646575Y
Application number: CN 03284840
Authority: CN
Inventors: 侯桂林; 张福银; 王国春; 刘武成; 张经武
Original assignee: 侯桂林
Priority date: 2003-08-25
Filing date: 2003-08-25
Publication date: 2004-10-06
Anticipated expiration: 2013-08-25

Abstract

The utility model relates to a lighting device for the coal powder boiler direct current burner and consists of a burner and a primary wind pipe. The burner is fixed and connected with the once wind pipe; the burner consists of a shell, a central tube and a small oil gun; and the central tube is positioned in the shell. The utility model is characterized in that the once wind pipe is welded with a coal powder separating clapboard; the separating clapboard divides the once wind pipe to a thick passage and a thin passage; the clapboard is provided with a plurality of holes which are distributed evenly; the front end of the thick passage is protruding provided with a coal powder condensing block; the part close to the inlet of the central tube is also protruding provided with a coal powder condensing block; the inner wall of the front part of the central tube is provided with a coal powder condensing ring; the inner wall of the shell is provided with a burning steady petal which protrudes insides; and the small oil gun crosses the shell and inserts into the central tube inclinedly. The utility model has an obvious oil saving effect and the cooling the central tube adopts the self once wind; the utility model is simple and reliable; and the inclined insertion of the small oil gun can prevent the burnt of the central tube.

Description

Coal powder boiler straight-flow burner igniting device

(1) technical field

The utility model relates to the igniter of pulverized coal power boiler, is particularly useful for the DC burner igniter of pulverized-coal fired boiler coner firing.

(2) background technology

Existing thermal power plant large coal powder boiler is all wanted a large amount of oil of oil gun burning when igniting or blowing out, make the coal dust firing that sprays into then, in addition, it is combustion-supporting also will to throw oil when boiler at low load moves, and comes smooth combustion with the method for a large amount of oil firings, therefore thermal power plant's fuel consumption is very big, and mostly be light diesel fuel, be a huge spending in the production cost, in addition, have plenty of oil gun is vertically inserted in the coal burner central tube, thereby than the easy burn-out central tube.And the full film type of cooling is all adopted in the cooling of central tube, its structure and system complex.

(3) summary of the invention

In order to solve the technical problem that exists in the above-mentioned prior art; the utility model provides modernized large coal powder boiler igniting of a kind of confession and the coal powder boiler straight-flow burner igniting device that surely uses; this igniter is in boiler start/ stop or low-load combustion-stabilizing process; can be with the less coal dust that heat is lighted main burner of lighting; thereby save a large amount of fuel oils; and the cooling of central tube is to utilize an outer wind of central tube to cool off, and is simple and reliable for structure.

The technical scheme that adopts is:

Coal powder boiler straight-flow burner igniting device comprises burner and an airduct.Burner is fixedlyed connected with an airduct, burner comprises housing, central tube and small oil gun, central tube is positioned at burner, its technical essential is that an interior solid welding of airduct has coal dust to separate dividing plate, this separation dividing plate is divided into concentrated phase passage and dilute phase passage with an airduct, separate on the dividing plate evenly being laid with a plurality of through holes, convex with the Pulverized Coal Concentration piece on the inwall of concentrated phase passage front end; Central tube also convexes with the Pulverized Coal Concentration piece near on the inwall of porch, convexes with the Pulverized Coal Concentration ring on the inwall of central tube front portion, and burner inner wall is provided with inwardly protruded steady combustion lobe, and small oil gun passes burner shell, and oblique cutting is gone in the central tube.

The angle of inclination that above-mentioned small oil gun inserts in the central tube is 45 °.

Operation principle:

The coal air mixture of an airduct forms dense phase pulverized coal an airduct elbow, under the effect that separates dividing plate, make dense phase pulverized coal remain on the entrance side of central tube always, and coal dust is imported in the central tube through the Pulverized Coal Concentration piece, under the small oil gun case of fire, dense phase pulverized coal is lighted, and in central tube, form the one-level burning.The dilute phase powder that the one-level combustion flame is lighted again behind the central tube forms secondary firing.Thereby utilization igniting heat is seldom lighted the coal dust of main burner, and central tube cools off with a wind.

The utility model compared with prior art has following advantage:

1, oil-saving effect is obvious, existing ignition of the boiler is example with 200MW, every start and stop once need be with 50 tons of fuel oil (being roughly equal to 150,000 RMB), though the transformation of domestic existing this respect, but every start and stop once also need 5-6 ton fuel oil, and igniter of the present utility model, every start and stop once only need 1 ton of left and right sides fuel oil.

2, domestic existing torch oil gun is exerted oneself and is 0.1-1.0t/h, and torch oil gun of the present utility model is only used 20kg/h.

3, domestic transformation also has the employing central tube, but all adopts the air film type of cooling, its structure and system complex.The cooling of the utility model central tube adopts the general mood of self to cool off, and system's tube list is reliable.

4, the utility model adopts unique steady combustion lobe, coal dust to separate the concentrated block of dividing plate and apart arrangement, has improved the technical performance of this device greatly.

5, the oblique insertion of small oil gun helps flame and leads forward, beats on central tube not make flame, thereby can prevent from central tube is burnt out.

(4) description of drawings

Fig. 1 is the structural representation of a kind of embodiment of the utility model.

(5) specific embodiment

See also Fig. 1, coal powder boiler straight-flow burner igniting device of the present utility model comprises burner 1 and an airduct 2.Burner 1 and airduct 2 are fixedlyed connected by flange, and burner 1 comprises housing 4, central tube 5, small oil gun 6.Central tube 5 is fixed in the housing 4 by support 7, and one time airduct 2 is made up of elbow and straight length.Its technical essential is that airduct 2 interior solid weldings have coal dust to separate dividing plate 8, this separation dividing plate 8 will be separated into concentrated phase passage 9 and dilute phase path 10 in the airduct, separate on the dividing plate 8 and evenly be laid with a plurality of through holes 11, solid welding has inwardly protruded Pulverized Coal Concentration piece 12 on the inwall of concentrated phase passage 9 front ends, in the central tube 5 near on the walls of porch also solid welding inwardly protruded Pulverized Coal Concentration piece 13 is arranged, solid welding has Pulverized Coal Concentration ring 14 on the inwall of central tube 5 front portions, and the inwall of housing 4 has in the form of a ring a steady combustion lobe 3 in the place ahead of central tube 5 solid welding.Small oil gun 6 passes housing 4, and inserts in the central tube 5 with 45.

Claims

1, coal powder boiler straight-flow burner igniting device, comprise a burner (1) and an airduct (2), burner (1) is fixedlyed connected with an airduct (2), burner (1) comprises housing (4), central tube (5) and small oil gun (6), central tube (5) is positioned at housing (4), it is characterized in that: the interior solid welding of an airduct (2) has and separates dividing plate (8) with what an airduct (2) was divided into concentrated phase passage (9) and dilute phase passage (10), separate on the dividing plate (8) evenly being laid with a plurality of through holes (11), an airduct (2) concentrated phase passage (9) front end convexes with Pulverized Coal Concentration piece (12); Central tube (5) convexes with Pulverized Coal Concentration piece (13) near on the inwall of porch, convex with Pulverized Coal Concentration ring (14) on the inwall of central tube (5) front portion, the inwall of housing (4) is provided with inwardly protruded steady combustion lobe (3), and small oil gun (6) passes housing (4), and oblique cutting is gone in the central tube (5).

2, coal powder boiler straight-flow burner igniting device according to claim 1 is characterized in that the angle of inclination that described small oil gun (6) inserts in the central tube (5) is 45 °.