CN201190993Y - Coal fine combustion apparatus for middle and small boiler - Google Patents

Abstract

A middle and small boiler coal powder combustion device comprises a coal powder preparation system, a coal powder transmission system, a coal powder burner and a coal powder combustion chamber, which is characterized in that the chamber of the coal powder burner is a cylinder chamber formed by a fireproof layer, an annular water cooling chamber is provided outside the fireproof layer, the input of the coal powder burner is connected with a cyclone spiral case and an ignition hole via a flange, the part of the chamber of the cyclone spiral case communicated with the chamber of the coal powder burner is provided with a horn nozzle, a dull body is provided in the chamber of the cyclone spiral case, the fireproof layer of the coal powder burner is provided with a second wind port, the chamber of the coal powder burner is communicated with the coal powder combustion chamber in the boiler body via the smoke outlet of the burner, the lower part of the coal powder combustion chamber is provided with a slag chamber, the bottom of the coal powder combustion chamber is provided with a slag removal machine, and the upper part of the coal powder combustion chamber is provided with a smoke outlet. The middle and small boiler coal powder combustion device has the advantages of high combustion efficiency of coal and heat efficiency of the boiler.

Description

A kind of medium small boiler coal powder burner

Technical field

The utility model relates to the coal powder burner in a kind of medium small boiler combustion system.

Background technology

The Chinese large-sized boiler is based on CFBB, the technology maturity height, and the combustion system of the medium small boiler of One's name is legion generally adopts chain furnace, and its combustion process belongs to mobile grate firing, and the thermal efficiency has only 60～70%, has caused the resource huge waste.The subject matter that exists is: 1, coal ignition difficulties, move behind the ignition point, and cause deficiency burning time, fixed carbon content is up to 10～25% in the lime-ash, and incomplete combustion loss is big, causes the coal burn-off rate low; 2, coefficient of excess air height is generally 1.3～1.5, in the practical operation even reach 1.5～1.8, causes the flue gas heat loss to increase, and causes boiler thermal output low.

Summary of the invention

The purpose of this utility model provides a kind of coal burn-off rate height, medium small boiler coal powder burner that boiler thermal output is high.

The technical solution of the utility model is: the utility model comprises coal dust preparation system, coal powder conveying system, coal burner and pulverized coal combustor.Coal dust preparation system is made up of conveyer belt, coal breaker, broken coal elevator, broken coal bucket, vibrations feeder, Raymond mill, cyclone separator, coal dust elevator and Pulverized Coal Bin.Coal powder conveying system is made up of coal dust proportioning device, a wind coal pipeline.The inner chamber of coal burner is the cylindrical cavity that flame retardant coating constitutes, and is provided with annular waterway in the outside of flame retardant coating.The input of coal burner is connected with eddy flow volute, fire hole by flange, a wind coal pipeline of coal powder conveying system communicates with eddy flow volute inner chamber, inner chamber at the eddy flow volute is established a loudspeaker spout with the inner chamber place of communicating of coal burner, be equipped with bluff body in the inner chamber of eddy flow volute, the end that this bluff body extend into the coal burner inner chamber is horn-like.The outer end of fire hole is connected with the igniting port lid by screw thread.Be provided with overfiren air port on the flame retardant coating of coal burner, overfiren air port and columniform flame retardant coating inwall are tangent and form an angle with cylindrical flame retardant coating axis, and overfiren air port links to each other with the secondary air channel in the coal burner outside.In waterway, be provided with cooling water inlet pipe and cooling outlet pipe.The coal burner inner chamber communicates with pulverized coal combustor in the boiler body by the burner exhanst gas outlet, and the bottom of pulverized coal combustor is a slag trapping chamber, is provided with slag remover in the bottom of pulverized coal combustor, is provided with exhanst gas outlet on the top of pulverized coal combustor.

Under the effect of eddy flow volute, enter into the coal burner inner chamber by the loudspeaker spout from the primary wind and powder of coal powder conveying system, coal dust is lighted by fire hole in the screw mode.After entering the normal combustion operating mode, secondary wind enters the movement locus that forms helix in the coal burner by overfiren air port, simultaneously under the bluff body acting in conjunction, form the recirculating zone of a high-temperature flue gas in the zone that is horn-like end near bluff body, coal dust in the recirculating zone of high-temperature flue gas is lighted, coal dust in the coal burner is moving and conflagration along spiral trajectory then, the high-temperature flue gas that forms is being carried unburnt semicoke particle secretly and is being carried out completing combustion by the pulverized coal combustor that the burner exhanst gas outlet enters in the boiler body, the lime-ash that generates is under the effect of high-temperature flue gas, reunite, generate the bigger dust slag of particle, because the space of pulverized coal combustor is big, the high-temperature flue gas flow velocity descends suddenly, and a part of lime-ash is deposited to bottom slag trapping chamber under the gravity effect; On the other hand, enter pulverized coal combustor owing to carry the high-temperature flue gas of lime-ash secretly in the screw mode, lime-ash is separated under action of centrifugal force, falls into bottom slag trapping chamber.Fixed carbon content is less than 2% in the lime-ash, and lime-ash discharges out of the furnace through slag remover, and the high-temperature flue gas after the slagging-off enters the boiler heating by exhanst gas outlet.After tested, the utility model can make the burn-off rate of coal reach more than 98%, and boiler thermal output reaches to 90%.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the structural representation of coal burner and pulverized coal combustor.

Parts label in the accompanying drawing is: 1 is conveyer belt, 2 is coal breaker, 3 is the broken coal elevator, 4 is the broken coal bucket, 5 are the vibrations feeder, 6 is Raymond mill, 7 is cyclone separator, 8 is the coal dust elevator, 9 is Pulverized Coal Bin, 10 is the coal dust proportioning device, 11 is boiler body, 12 is secondary air channel, 13 is coal burner, 14 is time wind coal pipeline, 15 are the igniting port lid, 16 is fire hole, 17 is bluff body, 18 is the eddy flow volute, 19 is flange, 20 is the loudspeaker spout, 21 are the cooling outlet pipe, 22 is overfiren air port, 23 is flame retardant coating, 24 is waterway, 25 are the cooling water inlet pipe, 26 is the burner exhanst gas outlet, 27 is slag trapping chamber, 28 is exhanst gas outlet, 29 is slag remover.

The specific embodiment

See Fig. 1 and Fig. 2, the utility model comprises coal dust preparation system, coal powder conveying system, coal burner and pulverized coal combustor.Coal dust preparation system is made up of conveyer belt 1, coal breaker 2, broken coal elevator 3, broken coal bucket 4, vibrations feeder 5, Raymond mill 6, cyclone separator 7, coal dust elevator 8 and Pulverized Coal Bin 9.Coal powder conveying system is made up of coal dust proportioning device 10, a wind coal pipeline 14.The inner chamber of coal burner 13 is the cylindrical cavity that flame retardant coating 23 constitutes, and is provided with annular waterway 24 in the outside of flame retardant coating 23.The input of coal burner 13 is connected with eddy flow volute 18, fire hole 16 by flange 19, a wind coal pipeline 14 of coal powder conveying system communicates with eddy flow volute 18 inner chambers, inner chamber at eddy flow volute 18 is established a loudspeaker spout 20 with the inner chamber place of communicating of coal burner 13, be equipped with bluff body 17 in the inner chamber of eddy flow volute 18, the end that this bluff body 17 extend into coal burner 13 inner chambers is horn-like.The outer end of fire hole 16 is connected with igniting port lid 15 by screw thread.Be provided with overfiren air port 22 on the flame retardant coating 23 of coal burner 13, overfiren air port 22 is tangent and form an angle with the cylindrical cavity axis with coal burner 13 inner chambers, and overfiren air port 22 links to each other with the secondary air channel 12 in coal burner 13 outsides.In waterway 24, be provided with cooling water inlet pipe 25 and cooling outlet pipe 21.Coal burner 13 inner chambers communicate by the pulverized coal combustor in burner exhanst gas outlet 26 and the boiler body 11, and the bottom of pulverized coal combustor is a slag trapping chamber 27, is provided with slag remover 29 in the bottom of pulverized coal combustor, is provided with exhanst gas outlet 28 on the top of pulverized coal combustor.

Claims (1)

1, a kind of medium small boiler coal powder burner, comprise coal dust preparation system, coal powder conveying system, coal burner and pulverized coal combustor, coal dust preparation system is made up of conveyer belt, coal breaker, broken coal elevator, broken coal bucket, vibrations feeder, Raymond mill, cyclone separator, coal dust elevator and Pulverized Coal Bin, and coal powder conveying system is made up of coal dust proportioning device, a wind coal pipeline; It is characterized in that: the inner chamber of coal burner is the cylindrical cavity that flame retardant coating constitutes, be provided with annular waterway in the outside of flame retardant coating, the input of coal burner is by flange and eddy flow volute, fire hole connects, a wind coal pipeline of coal powder conveying system communicates with eddy flow volute inner chamber, inner chamber at the eddy flow volute is established a loudspeaker spout with the inner chamber place of communicating of coal burner, be equipped with bluff body in the inner chamber of eddy flow volute, the end that this bluff body extend into the coal burner inner chamber is horn-like, the outer end of fire hole is connected with the igniting port lid by screw thread, on the flame retardant coating of coal burner, be provided with overfiren air port, overfiren air port and columniform flame retardant coating inwall are tangent and form an angle with cylindrical flame retardant coating axis, overfiren air port links to each other with the secondary air channel in the coal burner outside, in waterway, be provided with cooling water inlet pipe and cooling outlet pipe, the coal burner inner chamber communicates with pulverized coal combustor in the boiler body by the burner exhanst gas outlet, the bottom of pulverized coal combustor is a slag trapping chamber, bottom at pulverized coal combustor is provided with slag remover, is provided with exhanst gas outlet on the top of pulverized coal combustor.

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