CN2487965Y

CN2487965Y - Multifunctional pulverized coal burner using multi-stage axial feeding powder and gas film cooling technique

Info

Publication number: CN2487965Y
Application number: CN 01201022
Authority: CN
Inventors: 王爱生; 纪书信; 王雨蓬; 王公林; 唐宏; 邵瑞虎
Original assignee: YANTAI DEVELOPMENT ZONE LONGYUAN ELECTRIC POWER COMBUSTION CONTROL ENGINEERING CO LTD
Current assignee: Yantai Longyuan Power Technology Co Ltd
Priority date: 2001-01-15
Filing date: 2001-01-15
Publication date: 2002-04-24
Anticipated expiration: 2011-01-15

Abstract

The utility model discloses a multifunctional pulverized coal burner using multi-stage axial feeding powder and gas film cooling technique which is characterized in that a one-time powder inlet pipe 17 is inserted with a first grade burning cylinder inlet pipe 15, a second grade burning cylinder inlet pipe 16 and a dense adjustable baffle 18; the outer walls of a high-temperature plasma pipe 13 and a first grade burning cylinder outer sleeve 8 are provided with baffles 14 and 19. A one-time powder baffle 10 is used to separate the one-time powder inlet pipe 17 and an overfire air inlet pipe 9; annular gaps which can introduce the overfire air are designed between a forth burning cylinder 2 and a third burning cylinder 4 and between the third burning cylinder and the second burning cylinder. The coal burner of the structure has the advantages of multi-stage burning, burner coking prevention, etc. The utility model can achieve non-oil or less-oil ignition matching with a plasma ignition device and other ignition resource. The utility model has great economic benefit and social benefit.

Description

Adopt the multifunction coal dust combustor of multistage axial powder feed and air film cooling technology

The utility model discloses a kind of multifunction coal dust combustor that adopts multistage axial powder feed and air film cooling technology, it has characteristics such as big, the noncoking of exerting oneself, efficiency of combustion height, flame rigidity are strong, the different coals of incendivity, particularly this burner and direct firing coal-dust start that the plasma ignition device of Industrial Boiler is supporting to have an ignition trigger, low-load combustion-stabilizing and do the main burner function.

The ignition trigger of traditional industry pulverized-coal fired boiler all adopts fuel mode to heat up, and a 999 year, generating plant pulverized coal boiler is planned to reach 3,200,000 tons with innage, amounts to nearly 10,000,000,000 yuan of RMB.State Planning Commission calls in " China's energy " white paper in 1997 once that " it is an important energy policy in conjunction with China's national situation that the technology of replace oil with coal and product are applied in research and development, encourages the whole society to carry out the work of replace oil with coal." for this reason, China and whole world relevant expert had once studied the problem that adopts the direct firing coal-dust of plasma technology since the eighties.Australia develops the bituminous coal plasma ignition device that adopts the nitrogen protection electrode; a large amount of basic research works was once done to this problem by the former Soviet Union; done fire trial in China Baoji and Shaoguan Power Plant respectively in 1996 and in 1998, but all do not started successfully.Great deal of experimental work was all done by units such as the Tsing-Hua University of China, Harbin Boiler Plant on this project.

Directly the plasma ignition device (ZL 99 2 48829X) of firing coal-dust startup station boiler adopts axial-flow type two-stage powder feeding burner to realize the non-oil ignition first time that coal-burning boiler starts on China's history 2000 on February 15, in Yantai power plant.But shortcomings such as the coking of this burner various degrees, ablation, function and burning coal are single, improvement expenses height, it is strong to fail to develop a kind of adaptability, and safe and reliable coal burner has influenced applying of plasma ignition device.

The purpose of this utility model provides a kind of multifunctional burner that adopts multistage axial powder feed and air film cooling technology, solved burner coking, ablate and have igniting, surely fire and do the function of main burner, improved the reliability and the economy of plasma ignition device widely.

The purpose of this utility model is achieved in that a kind of multifunction coal dust combustor that adopts multistage axial powder feed and air film cooling technology, it mainly by burner nozzle, level Four combustion barrel, wind powder pipe spare, primary wind and powder enter pipe, secondary wind enters pipe, compositions such as deflector, high-temperature plasma body canal, adjustable coal powder light-dark deflector.

Wherein, enter pipe 17 coal dusts that carry by wind and entered burner body in 18 minutes three the tunnel through adjustable coal powder light-dark deflector, at first 20% thick coal culm enters pipe 15 by the first-stage burning tube and enters first-stage burning tube 12 through first-stage burning tube deflector 14.Enter pipe 16 by second level combustion barrel and enter second level combustion barrel 6 through second level combustion barrel deflector 19, the coal dust of Third Road 20% enters third level combustion barrel 4 through primary wind and powder deflector 10 by third level combustion barrel coal dust passage 20.

Wherein, the secondary wind of secondary wind by wind powder pipe spare 7 enters 9 fens two-way of pipe and enters burner.One transportation work style is carried out the oxygenating burning after cooling off first-stage burning tube 12 outer walls by first-stage burning tube outer tube 8 upper entrances.Second transportation work style is divided two-way after by the cooling of 22 pairs of third level combustion barrel 4 outer walls of secondary air channel again, wherein one the tunnel enters and carries out oxygenating another road of burning in the fourth stage combustion barrel 2 and enter burner hearth after by secondary air channel 24 cooling fourth stage combustion barrels 2.

Wherein, immediately above-mentioned 20% thick coal culm is lighted when high-temperature plasma body canal 13 provides high-temperature plasma, this flame is further lighted 60% coal dust again, and all the other coal dusts of 20% are by the 20 as above torch mixed combustions together of third level combustion barrel coal dust passage.This part wind powder air-flow also plays the effect of cooling second level combustion barrel.

The utility model has the advantages that: employing is amplified ignition way step by step and has been improved exerting oneself of this burner greatly and reduced energy consumption, and this burner has possessed the condition of doing main burner again except that having igniting and steady combustion function; Adopted that secondary air separating is other has realized that to first-stage burning tube 12, second level combustion barrel 6, third level combustion barrel 4, fourth stage combustion barrel 2 air film cooling makes the combustion barrel wall temperature avoid coking below all reducing to the ash fusion point temperature; Strengthened the rigidity of burning and having improved flame by the oxygenating of secondary wind in oxygenating of in third level combustion barrel 4, flowing and the fourth stage combustion barrel 2 by thin powdered coal;

Enter pipe 15 coal dust by the first-stage burning tube and make radially through first-stage burning tube deflector that powder feeding becomes axial powder feed, and impartial in the pipe annular pressure realized the wind powder bag fire of combustion process, avoid the burner coking, reached the purpose of the different coals of can burning.

Because this burner is used for the plasma ignition device that direct firing coal-dust starts Industrial Boiler, accelerated this equipment applying on Industrial Boiler, because having replaced Industrial Boiler can be country with the conventional method of fuel mode starting ignition, steady combustion save fuel oil about 3,200,000 tons every year, amount to 10,000,000,000 yuan of RMB, have tangible economic benefit and social benefit.

Fig. 1 is the structural representation of the multifunction coal dust combustor of multistage axial powder feed of employing described in the utility model and air film cooling technology.

In conjunction with the accompanying drawings the utility model is described further below by embodiment:

Embodiment 1

As shown in Figure 1, a kind of multifunction coal dust combustor that adopts multistage axial powder feed and air film cooling technology, it is mainly by burner nozzle 1, fourth stage combustion barrel 2, burner urceolus 3, third level combustion barrel 4, secondary wind inner sleeve 5, second level combustion barrel 6, wind powder pipe spare 7, first-stage burning tube outer tube 8, secondary wind enters pipe 9, primary wind and powder deflector 10, first-stage burning drum flange dish 11, first-stage burning tube 12, high-temperature plasma body canal 13, first-stage burning tube deflector 14, the first-stage burning tube enters pipe 15, second level combustion barrel enters pipe 16, primary wind and powder enters pipe 17, adjustable coal powder light-dark deflector 18, second level combustion barrel deflector 19, third level combustion barrel coal dust passage 20, gusset piece 21, secondary air channel 22, gusset piece 23, secondary air channel 24, above parts connect by welding manner with gusset piece successively, wind powder pipe spare 7 is with using screw attachment between the combustion barrel, first-stage burning tube 12, first-stage burning tube overcoat 8 and high-temperature plasma body canal 13 weld together with first-stage burning drum flange dish 11.Burner nozzle 1 welds together with burner urceolus 3.The cooling air that enters pipe 9 from secondary wind divides three the tunnel respectively to first-stage burning tube outer tube 8, and first-stage burning tube 12 outer walls are cooled off and oxygenating; Third level combustion barrel 4 outer walls and fourth stage combustion barrel 2 outer walls are cooled off; Fourth stage combustion barrel 2 inwalls are cooled off and oxygenating in advance; Combustion barrel 6 outer walls in the second level cool off with wind powder air-flow.

The mandatory axial powder feed that becomes of the wind powder mixture that will radially send here in first-stage burning tube 12 has been avoided the burner coking, can success light different coals.

Working method of the present utility model and principle are: enter the high-temperature plasma that a small amount of coal pruinescence high-temperature plasma body canal 13 transmission of first-stage burning tube 12 comes and light and form little torch, this little torch pours second level combustion barrel 6 to be mixed and lights with coal dusts in a large number.Flame carries out the oxygenating overheavy firing and reaches the purpose of the rigidity that improves flame in third level combustion barrel 4 and fourth stage combustion barrel 2.

Claims

1, a kind of multifunction coal dust combustor that adopts multistage axial powder feed and air film cooling technology, it mainly is made up of wind powder pipe spare and multistage coal burner.It is characterized in that: in primary wind and powder enters pipe (17), insert the first-stage burning tube and enter pipe (15), second level combustion barrel enters a pipe (16) and an adjustable coal powder light-dark deflector (18), at high-temperature plasma body canal (13) and first-stage burning tube outer tube (8) outside weldings first-stage burning tube deflector (14) and second level combustion barrel deflector (19); Entering pipe (17) at primary wind and powder enters with secondary wind between the pipe (9) with primary wind and powder deflector (10) isolation.

2, the coal burner of multistage axial powder feed of employing according to claim 1 and air film cooling technology is characterized in that: reaching third level combustion barrel (4) between fourth stage combustion barrel (2) is with third level combustion barrel (4) has the annular gap that imports secondary wind with all designing between the second level combustion barrel (6); First-stage burning tube deflector (14) and second level combustion barrel deflector (19) water conservancy diversion corner are 90 °.