CN201137932Y

CN201137932Y - Circulating fluid bed boiler coal drop pipe wear prevention structure

Info

Publication number: CN201137932Y
Application number: CNU200720091849XU
Authority: CN
Inventors: 李朝侠; 黄河
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-09-11
Filing date: 2007-09-11
Publication date: 2008-10-22
Anticipated expiration: 2017-09-11

Abstract

The utility model belongs to the circulating fluidized bed boiler technique and proposes a wear preventive structure of a coal conduit of a circulating fluidized bed boiler, the coal conduit comprises a coal outlet end port, a coal poking wind pipe and a furnace outer shell steel plate, wherein a guiding platform which is made of abrasion-proof fire-proof pouring materials is arranged on the cross section between the coal outlet end port and a furnace box, smooth arc transition is formed between the coal outlet end port and the furnace box, and the guiding platform is extended into the furnace box. According to the operating characteristics and the dynamic analysis of the fluidized bed boiler, the wear prevention structure adopts a mode of intensifying the whole intensity of a coal outlet, changes the cross section area and the shape to suitably prolong the lower portion of a coal feeding point, abrasion-proof prefabricated bricks and intensified high temperature prefabricated steel plates are used on a coal outlet position which is easily worn of the coal conduit, thereby, the edge furnace wall of the coal outlet end port of the coal conduit is stabilized, the sticking damage to the edge is reduced, the intensity and the abrasion-resistance of a furnace lining on the lower portion of the coal conduit are greatly increased, and the structure can rapidly check and repair the furnace lining which is severely damaged on the lower portion of the coal conduit.

Description

The abrasion-proof structure of CFBB coal spout

Technical field

The utility model belongs to the CFBB technology, mainly proposes a kind of abrasion-proof structure of CFBB coal spout.

Background technology

CFBB (be called for short CFB) has that suitable coal is wide, efficient, energy-saving and environmental protection four big characteristics, be present stage domestic 74% or more be with the coal Energy Situation the generating means of necessary employing.In CFBB, burner hearth distributing the size tens pipeline holes, though be provided with the abrasion-proof concrete furnace lining in the pipeline hole, but because the emulsion zone eddy current that is caused around hole wearing and tearing are very strong, at first cause the slim furnace wall of furnace wall membrane wall to damage, for fluidized-bed combustion boiler, coal dropping port and peripheral region are one of the strongest zones of CFBB wearing and tearing, the type of furnace is big more, the cross section of coal dropping port outlet is just big more, wearing and tearing are just serious more, and are just big more to the destructiveness of whole boiler operatiopn, often cause coal dropping port explosion on every side to cause blowing out.When boiler operatiopn, a large amount of colms coal breakage pipeline flow-direction burner hearth of flowing through, coal a fluid stream high speed rotating flow under the carrying secretly of coal spread wind big around the coal dropping port forms the rotation angle to burner hearth and with burner hearth principal phase stream, thereby around coal dropping port, form strong disturbance and revolve the phase a fluid stream, furnace wall around the coal dropping port is produced severe dig the turnery damage, the design of coal dropping port generally has two kinds of methods: less boiler coal spout is thinner, and coal spout adopts whole wear-resistant steel pipe to put in burner hearth; Large tonnage boiler, the coal spout upper temp is bordering on normal temperature, and the burner hearth coal outlet reaches several Baidu high temperature, heat resisting pipe will produce deformation and curling, stops coal stream.Designed person partly mentions the coal outlet steel construction apart from coal outlet 0.6-1.2M place, is born the wearing and tearing of at a high speed big a fluid stream coal stream by the wear-resistant castable furnace lining apart from this section of coal outlet 0.6-1.2M place.All factors can cause destroying by rush of water rapidly of coal outlet.Because boiler requires to resume operation rapidly, water the time that does not have intensity in the health after material feeding is repaired, so the situation after repairing is unsatisfactory, can damage again often very soon.

Summary of the invention

The purpose of this utility model promptly is the abrasion-proof structure that proposes a kind of CFBB coal spout, existing CFBB coal spout structure is improved, thereby overcome existing structure design above shortcomings.

The abrasion-proof structure that the utility model proposes the CFBB coal spout is: coal spout has the port of producing coal, dials coal airduct and stove outer covering steel plate; Be characterized in producing coal port and the setting of burner hearth infall by the guide table that abrasion-proof and refractory pouring material constitutes, making produces coal between port and the burner hearth constitutes smooth arc and spends and cross, and this guide table stretches in the burner hearth.

The reinforcement anchoring piece that has metal material in this guide table, an end of strengthening anchoring piece is connected with the boiler jacket steel plate.

For realizing the purpose of this utility model better; alleviate coal spout outlet wearing and tearing; effectively the material feeding top layer is watered in protection; in order to avoid baker is not enough or sintering does not cause early stage furnace lining material strength failure thoroughly; bottom furnace lining between coal spout lower end and the guide table is made of wear-resisting preformed bricks; wear-resisting preformed bricks is arranged on apart from the position easy to wear at guide table 0.6-1.2M place; before integrated poured furnace lining, bury underground in advance; so that can become one with the other parts of pipeline furnace lining; because wear-resisting preformed bricks and furnace lining are the material feeding of watering of same model, the problem that thermal stress and thermal expansion difference cause damage of furnace lining can not occur.Adopt and to water wear-resisting preformed bricks that material feeding makes and other position furnace lining with the same model of furnace lining and water material feeding and integrally combine.

In order to realize the purpose of this utility model better; wear-resisting preformed bricks surface has the protection steel plate in the furnace lining of described coal spout bottom; the length of this protection steel plate is greater than the laying length of wear-resisting preformed bricks; has the lacing wire of protection steel plate below the protection steel plate; to protect steel plate to connect one, constitute the ladle prefabricated component with the stove outer covering steel plate.Rate of decay at coal spout is very fast in the recirculating fluidized bed furnace lining; change maintenance at the interim several that needs of the overhaul of a furnace lining; and in rushing to repair fast; the condition and the time that often do not have qualified maintenance baker; and after putting into operation in the later stage sufficient burning condition and temperature can not be arranged; cause the furnace lining intensity after the repairing unsatisfactory; described wear-resisting preformed bricks and protection steel plate are combined into one; be about to protect steel plate to cover ladle prefabricated component and abrasion-proof and refractory pouring material formation combined kiln lining that wear-resisting preformed bricks constitutes; prefabricated component has in order to connect the metal lacing wire of one with the furnace enclosure steel plate simultaneously, has solved this problem preferably.

In technique scheme, other part of the recirculating fluidized bed coal spout that does not relate to is same as the prior art.

Compared with prior art, the beneficial effects of the utility model are: according to the operation characteristic and the mechanical analysis of fluidized-bed combustion boiler, the utility model adopts the bulk strength of reinforcing coal outlet, change coal outlet cross section and shape, make down coal point bottom proper extension, at the position of producing coal easy to wear of coal spout with wear-resisting preformed bricks and strengthen the high-temperature wearable steel plate, thereby stablized the produce coal edge furnace wall of port of coal spout, reduce the border and impact damage, the furnace lining intensity and the wearability of coal spout lower position are improved greatly, and can accomplish the impaired serious furnace lining of coal spout lower position is overhauled fast.

Description of drawings

Accompanying drawing is the example structure schematic diagram that the utility model provides.

Among the figure; 6, heat-resistance stainless steel is strengthened anchoring piece; 19, LH-1604 corundum matter wear-resistant castable preformed bricks, 20, dial the coal airduct, 21, coal unloading tube; 22, wear-resisting sheath steel plate; 23, protection steel plate lacing wire, 24, the stove outer covering steel plate, 25, LH-1604 corundum matter high abrasion castable refractory cast guide table; 26, the port that produces coal, 27, LH-1603 abrasion-proof and refractory pouring material layer.

The specific embodiment

The embodiment that provides in conjunction with the accompanying drawings is illustrated its structure:

As shown in the figure; the coal spout of this relatively large CFBB has the port of producing coal; dial coal airduct and stove outer covering steel plate; the infall of port and burner hearth of producing coal is provided with a spy and advances guide table in the burner hearth; making produces coal between port and the burner hearth constitutes smooth arc and spends and cross; be provided with the reinforcement anchoring piece in the furnace lining of guide table; an end of strengthening anchoring piece is connected with the furnace shell steel plate; strengthening anchoring piece is the Y type; also can be other shape; the foundation of guide table makes down coal point bottom proper extension; make the port lower furnace face that produces coal form dilute-phase zone and produce " air cushion " effect; increase the resistance that pours in down a chimney of the wind in burner hearth principal phase district; guiding coal line flows to burner hearth comparatively swimmingly and again the membrane wall wing furnace lining of burner hearth side is suitably thickeied, with opposing coal stream impulsive force and protection furnace lining.Water the material feeding top layer for alleviating the effective protection of outlet wearing and tearing; in order to avoid baker is not enough or sintering causes early stage furnace lining material strength failure; bottom furnace lining between coal spout lower end and the guide table is made of wear-resisting preformed bricks; this wear-resisting preformed bricks is arranged on apart from the position easy to wear at guide table 0.6-1.2M place; before integrated poured furnace lining, bury underground in advance, so that can become one with the other parts of pipeline furnace lining.Since wear-resisting preformed bricks burnt till and with furnace lining be the material feeding of watering of same model, the problem that thermal stress and thermal expansion difference cause damage of furnace lining can not appear.The surface of wear-resisting preformed bricks also is provided with the protection steel plate; this protection steel plate length is greater than the laying length of wear-resisting preformed bricks; following also being provided with of protection steel plate protected the steel plate lacing wire; the lacing wire of protection steel plate will protect steel plate and furnace shell steel plate to be linked together; according to the condition and the time that in rushing to repair fast, often do not have qualified maintenance baker; and after putting into operation in the later stage sufficient burning condition and temperature can not be arranged; cause the furnace lining intensity after the repairing unsatisfactory; present embodiment adopts described wear-resisting preformed bricks and protection steel plate is combined into one, and the ladle prefabricated component and the abrasion-proof and refractory pouring material that promptly in advance prefabricated protection steel plate are covered wear-resisting preformed bricks constitute combined kiln lining.Because the utility model is provided with the combined type furnace lining that contains wear-resisting preformed bricks at the position easy to wear of the port of producing coal; the protection steel plate is arranged again on it; the furnace lining of port is by heavy wear in case produce coal; dismountable remaining furnace lining; spread the new combined type furnace lining that contains wear-resisting preformed bricks and protection steel plate, can finish the task of quick maintenance.

Claims

1, a kind of abrasion-proof structure of CFBB coal spout, coal spout include the port that produces coal, dial coal airduct, stove outer covering steel plate; It is characterized in that: be provided with the guide table that is made of abrasion-proof and refractory pouring material at produce coal port and burner hearth infall, making produces coal between port and the burner hearth constitutes smooth arc and spends and cross, and this guide table stretches in the burner hearth.

2, the abrasion-proof structure of CFBB coal spout according to claim 1 is characterized in that: have the reinforcement anchoring piece of metal material in the described guide table, the end welding of strengthening anchoring piece is connected on the furnace shell steel plate.

3, the abrasion-proof structure of CFBB coal spout according to claim 1 is characterized in that: the bottom furnace lining between described coal spout lower end and the guide table is made of the wear-resisting preformed bricks with the same model castable refractory of furnace lining.

4, the abrasion-proof structure of CFBB coal spout according to claim 3 is characterized in that: described wear-resisting preformed bricks is placed on apart from guide table 0.6-1.2M place.

5, the abrasion-proof structure of CFBB coal spout according to claim 3 is characterized in that: described wear-resisting preformed bricks surface has the protection steel plate, and protection has the lacing wire of protection steel plate below the steel plate, constitutes the steel prefabricated component.