CN203478218U - Compact type circulating fluidized bed boiler capable of cleanly combusting high-sodium coal - Google Patents

Compact type circulating fluidized bed boiler capable of cleanly combusting high-sodium coal Download PDF

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Publication number
CN203478218U
CN203478218U CN201320386849.8U CN201320386849U CN203478218U CN 203478218 U CN203478218 U CN 203478218U CN 201320386849 U CN201320386849 U CN 201320386849U CN 203478218 U CN203478218 U CN 203478218U
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fluidized bed
circulating fluidized
bed boiler
sodium coal
ash
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CN201320386849.8U
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江建忠
黄中
肖平
徐正泉
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Huaneng Clean Energy Research Institute
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Huaneng Clean Energy Research Institute
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Abstract

The utility model provides a compact type circulating fluidized bed boiler capable of cleanly combusting high-sodium coal. The compact type circulating fluidized bed boiler comprises a hearth which is divided into a dense phase region in the lower part of the hearth and a diluted phase region in the upper part of the hearth; the hearth diluted phase region is connected to a smoke outlet of a stokehold cyclone separator of the boiler by a separator inlet flue; a dust exhausting opening of the cyclone separator is connected with a material returning device by a stand pipe; the material returning device is connected with the hearth dense phase region by a material returning pipe. High-temperature smoke generated by combustion in the hearth is rapidly cooled after passing by in-furnace screen type heated surfaces in the hearth diluted phase region and then fused fly ash is condensed effectively, so that the ash deposition on a convection heated surface on a tail part is relieved effectively; meanwhile, the space between each two adjacent in-furnace screen type heating surfaces is great and an ash blowing device can be used for effectively cleaning deposited ash, so that the operation period of the boiler is prolonged greatly. The compact type circulating fluidized bed boiler has the characteristics of compact structure, and convenience for modularized design and amplification; a steel frame structure of the boiler is utilized reasonably; the compact type circulating fluidized bed boiler is suitable for implementation of a large-scale utilization technology of high-sodium coal.

Description

A kind of compact circulating fluidized bed boiler that can the high sodium coal of clean burning
Technical field
The utility model belongs to clean coal burning and utilizes technical field, particularly a kind of compact circulating fluidized bed boiler that can the high sodium coal of clean burning.
Background technology
China is the country of rich coal resources, 10,997 hundred million tons of proved reserves, and prediction coal total resources is over 5,000,000,000,000 tons, but the most coal resources of China are positioned at west area, these regional precipitations are few, belong to arid, semiarid and Desertification, ecological environment frailty, underdeveloped.If merely by coal resources outward transport, freight volume is large, distance, this is the extensive Main Bottleneck utilizing of western coal resource, and in west area, adopting coal resources combustion power generation and sending outside is to solve the best approach of utilizing at present bottleneck problem.
Xinjiang coal reserves in west area is the abundantest, and moisture and the volatile matter content of Xinjiang coal are higher, and ash content, calorific value are lower, sodium and potassium content in coal ash are higher, and ash fusion point is lower, and in combustion process, its coal ash contamination is extremely strong, belong to strong fouling and slagging type ash, belong to high sodium coal category.In the process that uses high sodium coal, find, in a considerable amount of boiler furnaces, superheater and reheater region can form the dust stratification that large stretch of caking property is very strong in a short time, and with serious high temperature corrosion, finally cause boiler large area booster, directly affected reliability, security and the economy of boiler operatiopn.
In prior art means, generally by increase furnace cross-sectional area, Optimizing Combustion and air distribution, increase, blow the grey frequency, use the means such as additive, coal mixing combustion to be delayed, but be difficult to all the time radical cure.Therefore use all genus a great problem of high sodium coal both at home and abroad, the high Na Meijin U.S., Australia and China minority power plant mix to burn and utilize.Mixing in burning process, easily there is staiing blockage problem in the slagging scorification of burner in the stove region and high temperature superheater, high temperature reheater in pulverized-coal fired boiler, and CFBB easily occurs that at bed surface coking and back-end ductwork heating surface stain blockage problem.Although generally speaking use the cycle of operation of the CFBB of high sodium coal, to be longer than pulverized-coal fired boiler, and the mixed-fuel burning proportion of CFBB will be higher than pulverized-coal fired boiler (being generally 40%~50%), but because mix burning coal price is higher, the economy of unit operation has been subject to impact significantly.
Therefore, want to realize the extensive utilization of coal resources in China, in the urgent need to seeking the method for the high sodium coal of a kind of direct burning.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the purpose of this utility model is to provide a kind of compact circulating fluidized bed boiler that can the high sodium coal of clean burning, can use cleanly and efficiently high sodium coal, avoids dust stratification and slagging scorification.
To achieve these goals, the technical solution adopted in the utility model is:
A kind of compact circulating fluidized bed boiler that can the high sodium coal of clean burning, comprise burner hearth, described burner hearth is divided into the burner hearth emulsion zone 1 of bottom and the burner hearth dilute-phase zone 2 on top, burner hearth dilute-phase zone 2 connects the exhanst gas outlet of the cyclone separator 4 being arranged in before Boiler Furnace by separator inlet flue 3, the dust-exhausting port of cyclone separator 4 connects material returning device 6 by standpipe 5, and material returning device 6 connects burner hearth emulsion zone 1 by feed back pipe 7.
In described burner hearth dilute-phase zone 2, be provided with the stove inner screen type heating surface A that multi-disc is arranged.
Described stove inner screen type heating surface A is arranged in front-back wall or left and right side wall, and the spacing between screen is between 200~1000mm.
Clean flue gas after described cyclone separator 4 dedustings is entered and is connected cooling stack 9 by central cylinder of separator 8, connects cooling stack 9 and connects back-end ductwork 10 longitudinally, and back-end ductwork 10 bottoms are provided with back-end ductwork outlet 13 and with the ash bucket 11 of ash bucket ash discharging hole 12.
In described connection cooling stack 9, be provided with the cooling heating surface C of multistage screen formula flue gas, the cooling heating surface C of described multistage screen formula flue gas is convection type heating surface, at different levels between series winding arrange.
In described back-end ductwork 10, be furnished with back-end ductwork heating surface B.
In described separator inlet flue 3, connection cooling stack 9 and back-end ductwork 10, be provided with soot blower 16, soot blower 16 is arranged between different heating surfaces or between the zones of different of identical heating surface along flow of flue gas direction, sootblowing dielectric is steam, air, combustion gas or water, soot blower 16 peripheries arrange ash removing opening simultaneously, for manpower or machinery, supplement deashing.
Described material returning device 6 is provided with circulating ash floss hole 15, for the circulating ash in regular or continuous blow-down material returning device 6.
Described feed back pipe 7 connects material adding tube 14, after the required coal that burns, desulfurizing agent and supplementary bed material can mix with the circulating ash in feed back pipe 7 by material adding tube 14, sends into burner hearth emulsion zone 1 or sends into separately burner hearth emulsion zone 1.A lime-ash part is carried away by flue gas, and the circulating ash exhaust system 15 that the slag-drip opening 17 that a part is arranged by burner hearth emulsion zone 1 and material returning device 6 arrange regularly or is continuously discharged.Condensation cure gaseous bases metal and compound thereof in flying dust, end slag and bed material also can be replaced and enrichment is discharged by slag-drip opening 17 and circulating ash exhaust system 15.
The desulfurizing agent that the utility model is used comprises that lime stone, calcium hydroxide, carbide slag maybe can serve as the material of desulfurizing agent.The supplementary bed material using comprises that sand, slag, circulating ash etc. can serve as an inertia supplementation material for bed material, and these materials can be regularly or continuous supplementation.
In separator inlet flue 3, be provided with the denitrification reducing agent entrance 18 for regular or continuous adding denitrfying agent, in order to reduce NOX concentration of emission, can be regularly or spray into continuously the material of denitrfying agent by denitrification reducing agent entrance.Denitrfying agent comprises that aqueous solution of urea, ammoniacal liquor, liquefied ammonia maybe can serve as the material of denitrfying agent.
Described burner hearth emulsion zone 1 and burner hearth dilute-phase zone 2 air current flow speed are 3~5m/s, and simultaneous temperature is controlled between 600~850 ℃.
Compared with prior art, the beneficial effects of the utility model are:
1. due to cyclone separator is preposition, compact conformation, has efficiently utilized steel frame construction, has saved boiler occupation of land, though increase combustion space also can not cause the increase of boiler overall volume.
2. separator is preposition, has extended the length that connects cooling stack, is convenient to arrange the cooling heating surface of multistage screen formula flue gas, fully cooled flue gas.
3. bring into play the low advantage of ignition temperature of CFBB, reduced the burst size of alkali metal and compound thereof.
4. high density soot blower makes dust stratification be easy to cleaning, has avoided deposition.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present utility model.
Fig. 2 is the top view of Fig. 1.
To be that the utility model is a kind of connect the structural representation that cooling stack is arranged in burner hearth side application example to Fig. 3.
Fig. 4 is the top view of Fig. 3.
The specific embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.But those skilled in the art understand, and protection domain of the present utility model is not limited to the content of following embodiment, and any improvement of making on the utility model basis and variation, all within protection domain of the present utility model.
Embodiment 1:
Referring to Fig. 1 and Fig. 2, this boiler comprises burner hearth emulsion zone 1 and burner hearth dilute-phase zone 2, is provided with each 4 of 8 stove inner screen type heating surface A(left and right side walls in burner hearth dilute-phase zone 2).Burner hearth dilute-phase zone 2 is connected by separator inlet flue 3 with cyclone separator 4, totally 2, cyclone separator 4, and compact Layout is in boiler front side.Flue gas after cyclone separator 4 dedustings is entered and is connected cooling stack 9 and connect that in cooling stacks 9, to be provided with the cooling heating surface C of two-stage flue gas be convection type heating surface by central cylinder of separator 8, by this heating surface, can reduce flue-gas temperature, connect the top that cooling stack 9 is arranged in boiler furnace.In back-end ductwork 10, be furnished with back-end ductwork heating surface B, cooled flue gas is finally discharged by back-end ductwork outlet 13.
The temperature of burner hearth emulsion zone 1 and burner hearth dilute-phase zone 2 is controlled between 600~850 ℃, and air current flow speed is 4.2m/s.The fine grained of lime-ash is carried away by flue gas, and the circulating ash floss hole 15 that the slag-drip opening 17 that a part is arranged by burner hearth emulsion zone 1 and material returning device 6 arrange is regularly discharged.Because ignition temperature is low, condensation cure gaseous bases metal and compound thereof in flying dust, end slag and bed material also can be replaced and enrichment is discharged by slag-drip opening 17 and circulating ash floss hole 15.
Because alkali metal and oxide thereof can form one deck attachment at heating surface, and then be bonded on heating surface, along with the prolongation of running time, progressively thickening, until stop up.For this reason, in separator inlet flue 3, connection cooling stack 9, back-end ductwork 10, be provided with high density soot blower 16, along flow of flue gas direction, strengthen and blow ash, sootblowing dielectric is selected steam and combustion gas, and soot blower arranges that density is 1 every meter.In addition, at high density soot blower 16 peripheries, be also provided with ash removing opening, in particular cases can supplement deashing by manpower.Ash bucket 11 and ash bucket ash discharging hole 12 that back-end ductwork 10 bottoms arrange, can regularly discharge the dust stratification in back-end ductwork.
In order to reduce NOX concentration of emission, boiler is also provided with denitrification reducing agent entrance 18, and run duration sprays into continuously aqueous solution of urea and serves as denitrfying agent, carries out denitrating flue gas.
Embodiment 2:
Referring to Fig. 3 and Fig. 4, a kind of miniature boiler for steam supply, high sodium coal mainly burns.In burner hearth dilute-phase zone 2, be provided with before and after the curtain wall A(of 4 layouts each 2 of side walls), 2 cyclone separators 4 are arranged in stokehold.9 parts of 2 connection cooling stacks are arranged in burner hearth left side and right side, and boiler total height is lower, connects cooling stack 9 three grades of cooling heating surface C of flue gas are set in each.

Claims (9)

  1. One kind can the high sodium coal of clean burning compact circulating fluidized bed boiler, comprise burner hearth, it is characterized in that, described burner hearth is divided into the burner hearth emulsion zone (1) of bottom and the burner hearth dilute-phase zone (2) on top, burner hearth dilute-phase zone (2) connects the exhanst gas outlet of the cyclone separator (4) being arranged in before Boiler Furnace by separator inlet flue (3), the dust-exhausting port of cyclone separator (4) connects material returning device (6) by standpipe (5), and material returning device (6) connects burner hearth emulsion zone (1) by feed back pipe (7).
  2. 2. compact circulating fluidized bed boiler that can the high sodium coal of clean burning according to claim 1, is characterized in that, is provided with the stove inner screen type heating surface (A) that multi-disc is arranged in described burner hearth dilute-phase zone (2).
  3. 3. compact circulating fluidized bed boiler that can the high sodium coal of clean burning according to claim 2, is characterized in that, described stove inner screen type heating surface (A) is arranged in front-back wall or left and right side wall, and the spacing between screen is between 200~1000mm.
  4. 4. compact circulating fluidized bed boiler that can the high sodium coal of clean burning according to claim 1, it is characterized in that, clean flue gas after described cyclone separator (4) dedusting is entered and is connected cooling stack (9) by central cylinder of separator (8), connect cooling stack (9) and connect back-end ductwork (10) longitudinally, back-end ductwork (10) bottom is provided with the ash bucket (11) of back-end ductwork outlet (13) and band ash bucket ash discharging hole (12).
  5. 5. compact circulating fluidized bed boiler that can the high sodium coal of clean burning according to claim 4, it is characterized in that, in described connection cooling stack (9), be provided with the cooling heating surface of multistage screen formula flue gas (C), the cooling heating surface of described multistage screen formula flue gas (C) is convection type heating surface, at different levels between series winding arrange.
  6. 6. compact circulating fluidized bed boiler that can the high sodium coal of clean burning according to claim 4, is characterized in that, is furnished with back-end ductwork heating surface (B) in described back-end ductwork (10).
  7. 7. compact circulating fluidized bed boiler that can the high sodium coal of clean burning according to claim 4, it is characterized in that, in described separator inlet flue (3), connection cooling stack (9) and back-end ductwork (10), be provided with soot blower (16), soot blower (16) is arranged between different heating surfaces or between the zones of different of identical heating surface along flow of flue gas direction, sootblowing dielectric is steam, air, combustion gas or water, soot blower (16) periphery arranges ash removing opening simultaneously, for manpower or machinery, supplements deashing.
  8. 8. compact circulating fluidized bed boiler that can the high sodium coal of clean burning according to claim 1, is characterized in that, described material returning device (6) is provided with circulating ash floss hole (15), for the circulating ash in regular or continuous blow-down material returning device (6).
  9. 9. compact circulating fluidized bed boiler that can the high sodium coal of clean burning according to claim 1, is characterized in that, described feed back pipe (7) connects material adding tube (14).
CN201320386849.8U 2013-07-01 2013-07-01 Compact type circulating fluidized bed boiler capable of cleanly combusting high-sodium coal Active CN203478218U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103423738A (en) * 2013-07-01 2013-12-04 中国华能集团清洁能源技术研究院有限公司 Compact type circulating fluidized bed boiler for burning high sodium coal
WO2021212783A1 (en) * 2020-04-23 2021-10-28 西安热工研究院有限公司 Pulverized coal boiler capable of preventing contamination and slagging of convection heating surface

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103423738A (en) * 2013-07-01 2013-12-04 中国华能集团清洁能源技术研究院有限公司 Compact type circulating fluidized bed boiler for burning high sodium coal
CN103423738B (en) * 2013-07-01 2016-05-04 中国华能集团清洁能源技术研究院有限公司 A kind of compact circulating fluidized bed boiler that uses high sodium coal
WO2021212783A1 (en) * 2020-04-23 2021-10-28 西安热工研究院有限公司 Pulverized coal boiler capable of preventing contamination and slagging of convection heating surface

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