CN2371445Y

CN2371445Y - Special three-stage lighting integrated pulverized coal direct burner for electric generating boiler

Info

Publication number: CN2371445Y
Application number: CN 99214668
Authority: CN
Inventors: 曾锋
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-06-29
Filing date: 1999-06-29
Publication date: 2000-03-29
Anticipated expiration: 2009-06-29

Abstract

The utility model discloses a special three-stage lighting integrated pulverized coal direct burner for an electric generating boiler, which comprises an oil gun, an electronic ignition rod, a primary wind tube, a secondary wind tube, a bundling tube, and an expanding tube. The utility model has the advantages of compact structure and stable burning. When load is lower than 50 percents, burning is still stable and oil saving rate is high. Compared with the existing coal and powder direct ignition burner, the oil saving rate can reach above 30 percents. Compared with the traditional separation time-sharing three-stage ignition burner, the oil saving rate is as high as above 80 percents. Burning effect is not influenced by the quality of fuel oil. The burner is not blocked, with the advantage of noncoking.

Description

The special-purpose three grades of direct burners of the integrated coal dust of igniting of electricity generation boiler

The utility model relates to a kind of burner, the special-purpose three grades of direct burners of the integrated coal dust of igniting of particularly a kind of electricity generation boiler.

At present, the normally used burner of electricity generation boiler has two kinds, and is a kind of for separating three grades of start-up burners of timesharing, and its airduct and oil gun separate, and an airduct is positioned at the top of oil gun, and oil gun and electronic ignition lever place one; Its ignition procedure is: switch on to electronic ignition lever earlier, send electric spark, after about 10 seconds, oil gun is thrown oil, fire burns, Deng oil gun burning 8-10 hour, after boiler temperature rose to 600-700 ℃, one time airduct dropped into the burning of coal wind powder, burnt 3-4 hour, after boiler temperature rose to 1100-1200 ℃, power plant can generate electricity, and this kind burner is extensive use of for power plant at present; Another kind is a coal dust direct-fire burner, it is more similar to the utility model outward appearance, but there is not bundle pipes in its airduct, do not crack in the middle of the anterior bluff body, what oil gun adopted is the mechanical atomization oil burner nozzle, this kind burner extensively adopts when being power plant's technological transformation at present, and its ignition procedure is: after the electronic ignition lever energising, oil gun and an airduct are thrown oil and coal wind powder simultaneously; The former needs great amount of fuel oil before the boiler normal power generation, as: to the boiler of 200,000 kilowatts of units, need 70-80 ton oil approximately, the low-load combustion-stabilizing ability is 60-70%; The latter is enhanced than the former technology, and rate of economizing gasoline can reach 60-70%, as: to the boiler of 200,000 kilowatts of units, need 20-30 ton oil approximately.

The purpose of this utility model is to provide a kind of compact conformation, flameholding, the low-load combustion-stabilizing ability is strong, rate of economizing gasoline is high burner.

The purpose of this utility model realizes by following scheme:

Fig. 1 is a sectional structure schematic diagram of the present utility model.

Fig. 2 is the sectional structure schematic diagram of the utility model oil gun.

With reference to Fig. 1.Oil gun 1 and electronic ignition lever 2 are positioned at bundle pipes 5 pipes, oil gun 1 below, electronic ignition lever 2 is up; Bundle pipes 5 is positioned at the centre of an airduct 3; An airduct 3 is positioned at the centre of secondary air channel 4.It is characterized in that:

Airduct 3 is delivered to the front portion of burner by the annular flow path between it and the bundle pipes 5 with coal wind powder, and the effect by bluff body 6, in the bluff body 6 anterior recirculating zones that produce, plays the effect of the retention flame;

The expansion of bundle pipes 5 rear portions, middle front part shrinks, and it can collect part coal wind powder in an airduct 3, with its compression, to improve the coal pulverized-coal concentration, reduce ignition point, and the front portion that the coal wind powder after will compressing is at last delivered to bluff body 6 fire burns; Because ignition point is lowered, so flameholding is reliable;

With reference to Fig. 2, oil gun 1 adopts turbulent mixing supercharged, secondary fogging oil nozzle, it is characterized in that secondary booster dispersive nozzle 16 opens the front portion at shell 17, ring-like steam transmitting pipe 14 is arranged in turbulent mixing spray chamber 15 and shell 17 slits, one time turbulent mixing spray chamber 15 is positioned at the oil burner nozzle center, and turbulent flow sheet 13 is positioned at the root of a turbulent mixing spray chamber 15 and adjacent with oilhole 10, this kind oil gun rate of economizing gasoline height, flameholding, the flame temperature height of generation;

Its ignition procedure is: in electronic ignition lever energising, send 10 seconds behind the electric spark, oil gun and an airduct are thrown oil and coal wind powder simultaneously, this hour of fire burns 8-10, after furnace temperature rises to 600-700 ℃,

The utility model compact conformation, flameholding, be lower than at 50% o'clock at load, still can smooth combustion, the rate of economizing gasoline height, to compare with existing coal dust direct-fire burner, rate of economizing gasoline can be reached more than 30%; Compare with traditional three grades of start-up burners of separation timesharing, rate of economizing gasoline is up to more than 80%.And combustion efficiency is not subjected to the influence of fuel qualities, and burner does not stop up, noncoking.

Claims

1. special-purpose three grades of direct burners of the integrated coal dust of igniting of an electricity generation boiler, it comprises oil gun (1), electronic ignition lever (2), an airduct (3), secondary air channel (4), bundle pipes (5), bluff body (6), convergent divergent channel (7); It is characterized in that oil gun (1) and electronic ignition lever (2) are positioned at bundle pipes (5) pipe, oil gun (1) below, electronic ignition lever (2) is up; Bundle pipes (5) is positioned at the centre of an airduct (3); An airduct (3) is positioned at the centre of secondary air channel (4).

2. the special-purpose three grades of direct burners of the integrated coal dust of igniting of electricity generation boiler according to claim 1, it is characterized in that: the front portion of burner delivered to coal wind powder by the annular flow path between it and the bundle pipes (5) by an airduct (3), and the effect by bluff body (6), in the anterior recirculating zone that produces of bluff body (6).

3. the special-purpose three grades of direct burners of the integrated coal dust of igniting of electricity generation boiler according to claim 1, it is characterized in that: the expansion of bundle pipes (5) rear portion, middle front part shrinks.

4. the special-purpose three grades of direct burners of the integrated coal dust of igniting of electricity generation boiler according to claim 1, it is characterized in that: oil gun (1) adopts turbulent mixing supercharged, secondary fogging oil nozzle, it comprises pipeline road (8), steam transmitting pipe road (9), oilhole (10), two exhaust holes (11) and (12), turbulent flow sheet (13), ring-like steam transmitting pipe (14), a turbulent mixing spray chamber (15), secondary booster dispersive nozzle (16), shell (17), it is characterized in that secondary booster dispersive nozzle (16) opens the front portion in shell (17), ring-like steam transmitting pipe (14) is arranged in a turbulent mixing spray chamber (15) and shell (17) slit, a turbulent mixing spray chamber (15) is positioned at the oil burner nozzle center, and turbulent flow sheet (13) is positioned at the root of a turbulent mixing spray chamber (15) and adjacent with oilhole (10).