CN102620287A - Circulating fluidized bed boiler with air cooling type cyclone separator - Google Patents
Circulating fluidized bed boiler with air cooling type cyclone separator Download PDFInfo
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- CN102620287A CN102620287A CN201210093741XA CN201210093741A CN102620287A CN 102620287 A CN102620287 A CN 102620287A CN 201210093741X A CN201210093741X A CN 201210093741XA CN 201210093741 A CN201210093741 A CN 201210093741A CN 102620287 A CN102620287 A CN 102620287A
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Abstract
The invention discloses a circulating fluidized bed boiler with an air cooling type cyclone separator. The circulating fluidized bed boiler includes a furnace cavity, a cyclone separator and a tail flue, wherein the cyclone separator adopts the air cooling type cyclone separator; the heating surface of a separator body adopts a membrane wall or wind chamber structure and is cooled by air; an inlet air box is arranged at the bottom end of the air cooling type cyclone separator, and an outlet air box is arranged at the top of a separator barrel body; the primary air heating surface and the secondary air heating surface of the heating surface of the separator body are separately arranged; and a selective catalytic reduction (SCR) denitration system is arranged at the lower part of the tail flue. According to the circulating fluidized bed boiler, the air cooling of the cyclone separator can be realized, the occupied partial space of an air preheater in the tail flue is saved to arrange the SCR denitration system, the whole boiler is simple in structure and low in constructing and running costs, and the process of desulfurizing and denitrating at the same time in the circulating fluidized bed boiler is reasonably implemented.
Description
Technical field
The invention belongs to the Thermal Power Engineering applied technical field, be specifically related to a kind of CFBB that has the air-cooled type cyclone separator.
Background technology
Cyclone separator is one of critical component of CFBB; It also is one of technology of restriction recirculating fluidized bed large scale development; The main effect of cyclone separator is that the high-temperature material that furnace outlet is discharged is separated from flue gas; Send the burner hearth emulsion zone back to through material returning valve and continue to participate in circulation and burning, the efficient of separator and operational effect have directly determined the circulating ratio of particle and the material balance in the recirculating fluidized bed.
Present disclosed cyclone separator technology; Comprise high-temperature heat insulation formula cyclone separator and cooled cyclone separator; The latter mainly is the employing membrane wall structure, utilizes water-cooled or cold circle or the square cyclone separator of vapour; Such as the water-cooled square cyclone separator and the disclosed high-temperature horizontal cyclone separator of CN101786050A of the disclosed band accelerating sections of Chinese patent ZL93235842.X, these all are the successful trials in the high temperature cyclone separator evolution.Yet that adiabatic cyclone separator exists is bulky, cost is high, be prone to problems such as coking, and the evaporating heating surface of water-cooled or the cold cyclone separator of vapour or superheater surface also can move into burner hearth fully and adopt other methods for cooling.
In addition; For coal-burning boiler, be control NOx discharging, need to adopt selective catalytic reduction (SCR) to realize the flue gas NOx reduction under many situation; But SCR system floor space is big; System complex need to prolong or changes the back-end ductwork structure guaranteeing the installing space of SCR system, so conventional boiler installs SCR additional and can produce very big influence to back-end ductwork convection heating surface, steelframe and staircase etc.
Summary of the invention
The technical problem that the present invention will solve is: a kind of circulating fluidized bed boiler systems is provided; Its cyclone separator cools off with the primary and secondary air air; Saving Air Preheater Heating Surface and institute take up space; Thereby directly install the SCR denitrating system additional, rationally utilize boiler and back-end ductwork space, realize the dual purpose of efficient burning and low pollutant emission in the back-end ductwork bottom.
Technical scheme of the present invention is: a kind of CFBB that has the air-cooled type cyclone separator; It contains burner hearth, is arranged in an air compartment of burner hearth bottom, overfiren air port, cyclone separator and the back-end ductwork of burner hearth emulsion zone; The outlet of said burner hearth links to each other with the inlet of cyclone separator; The lower part outlet of cyclone separator links to each other with the burner hearth emulsion zone through feeding back device; Be furnished with high temperature superheater, low temperature superheater, economizer and air preheater in the said back-end ductwork successively, it is characterized in that: said cyclone separator adopts the air-cooled type cyclone separator, the cooling of separator main body heating surface bubbling air; The bottom of this air-cooled type cyclone separator is furnished with the air intake bellows; Separator cylindrical shell top is provided with the air outlet slit bellows, and air intake bellows and air outlet slit bellows are connected with the separator main body heating surface, and the separator inwall is covered with refractory material; The outlet of said air preheater links to each other with the air intake bellows through pipeline; Said air outlet slit bellows link to each other with overfiren air port with an air compartment respectively through pipeline.
Another technical characterictic of the present invention is: the main body heating surface of said air-cooled type cyclone separator adopts membrane wall or air compartment structure;
Another technical characterictic of the present invention is: main body heating surface spaced apart is wind heating surface and secondary wind heating surface in the said air-cooled type cyclone separator; Said air intake bellows comprise wind inlet bellows and the secondary wind bellows that enter the mouth; Said air outlet slit bellows comprise a wind and export bellows and secondary wind outlet bellows; Wind inlet bellows and wind outlet bellows are connected with a wind heating surface respectively; Secondary wind inlet bellows and secondary wind outlet bellows are connected with the secondary wind heating surface respectively, and one time wind outlet bellows link to each other with an air compartment through pipeline, and secondary wind outlet bellows link to each other with overfiren air port through pipeline.
In the technique scheme, the selective catalytic reduction of said air preheater lower disposed (SCR) denitrating system, wind heating surface in the said cyclone separator is 6: 4～5: 5 with the area ratio of secondary wind heating surface.
The present invention has the following advantages and the high-lighting effect: 1. cyclone separator is through air cooling, and its good cooling results is simple in structure, and separator is pressure-containing member not, thereby handling safety, and saves a part of back-end ductwork heat transfer space; 2. install the SCR denitrating system additional in the back-end ductwork space of saving, thereby avoided adjustment back-end ductwork structure and flue gas flow to install the SCR system additional, less to whole cooker furnace system structure influence, cost is lower; 3. the heating surface spaced apart of primary and secondary air in main air preheater and cyclone separator realizes the heating respectively of boiler primary and secondary air, air feed respectively; 4. the desulfurization with recirculating fluidized bed itself combines, and this boiler can be realized desulfurization, denitration simultaneously, reduces pollutant emission greatly.5. substitute adiabatic separator, adiabatic separator is heavy, startup heat is chronic greatly, use strong after-burning property coal is prone to problems such as coking thereby solve; 6. substitute cooled type separator,, save the shared back-end ductwork of part air preheater space the evaporating heating surface immigration burner hearth of replacement; 7. substitute the cold separator of vapour, the superheater surface of replacement is put into burner hearth, save the shared back-end ductwork of part air preheater space.Therefore, the present invention is capable of using on the boiler of existing form of ownership separator, and installs the SCR denitrating system easily, at low cost additional.
Description of drawings
Fig. 1 is an overall structure sketch map of the present invention.
Fig. 2 is that separator of the present invention adopts the membrane wall structure sketch map.
Fig. 3 is that separator of the present invention adopts the air compartment structural representation.
Fig. 4 is a separator air outlet slit bellows generalized section of the present invention (for the A-A cutaway view of Fig. 2).
Fig. 5 is that separator air intake bellows generalized section of the present invention (is the B-B cutaway view of Fig. 2.
Among the figure: the 1-burner hearth; 2-air-cooled type cyclone separator; The 3-back-end ductwork; The 4-air preheater; 5-air intake bellows; A wind inlet of 5a-bellows; 5b-secondary wind inlet bellows; 6-air outlet slit bellows; A wind outlet of 6a-bellows; 6b-secondary wind outlet bellows; Air compartment of 7-; The 8-overfiren air port; 9-SCR (SCR) denitrating system; The 10-exhanst gas outlet; The 11a-membrane wall; The 11b-air compartment; The 12-refractory material.
The specific embodiment
Further specify principle of the present invention, concrete structure and preferred forms below in conjunction with accompanying drawing.
Fig. 1 is an overall structure sketch map of the present invention; This civilization comprises burner hearth 1, is arranged in an air compartment 7 of burner hearth bottom, overfiren air port 8, cyclone separator and the back-end ductwork 3 of burner hearth emulsion zone; The outlet of burner hearth 1 links to each other with the inlet of cyclone separator; The lower part outlet of cyclone separator links to each other with the burner hearth emulsion zone through feeding back device, is furnished with high temperature superheater, low temperature superheater, economizer and air preheater 4 in the back-end ductwork 3 successively; Cyclone separator adopts air-cooled type cyclone separator 2; The cooling of separator main body heating surface bubbling air; The bottom of this air-cooled type cyclone separator 2 is furnished with air intake bellows 5; Separator cylindrical shell top is provided with air outlet slit bellows 6, and air intake bellows 5 are connected with the separator main body heating surface with air outlet slit bellows 6, and the separator inwall is covered with refractory material 12; The present invention carries out preheating as preheater to primary and secondary air by air-cooled type cyclone separator 2; For avoiding the heating surface area in the separator to satisfy not the requirement of air preheat; Keep the portion of air preheater 4 in the back-end ductwork, the outlet of air preheater 4 links to each other with air intake bellows 5 through pipeline; Cold wind is at first sent into and is carried out preheating in the air preheater 4, introduces the air intake bellows 5 of separator afterwards, in separator, carries out sufficient heat exchange with flue gas, is drawn by air outlet slit bellows 6; Air outlet slit bellows 6 link to each other with overfiren air port 8 with an air compartment 7 respectively through pipeline, send into burner hearth 1 participation as wind and secondary wind respectively through the air of separator preheating and burn; The selective catalytic reductions of back-end ductwork 3 lower disposed (SCR) denitrating system 9; Flue gas in back-end ductwork 3 with each convection heating surface in after the sufficient heat exchange; Get in the SCR denitrating system 9 and carry out denitration reaction with reducing agent, clean flue gas is discharged boiler by exhanst gas outlet.
Fig. 2 is that separator of the present invention adopts the membrane wall structure sketch map; Heat-transfer surface in the air-cooled type cyclone separator 2 adopts membrane wall 11a structure; Membrane wall 11a is that pipe and steel plate welding assembly system form; Membrane wall 11a links to each other with air outlet slit bellows 6 with air intake bellows 5 respectively, and air is sent in the pipe that is assigned to membrane wall 11a after the inlet bellows 5 and flows, and draws after being pooled to air outlet slit bellows 6 after the high-temperature material heating in the separated device of inner air tube.
Fig. 3 is that separator of the present invention adopts the air compartment structural representation; Heat-transfer surface in the air-cooled type cyclone separator 2 adopts air compartment 11b structure; Air compartment 11b links to each other with air outlet slit bellows 6 with air intake bellows 5 respectively, and air flows in air compartment 11b and is heated.
Fig. 4 and Fig. 5 are respectively separator air outlet slit bellows 6 of the present invention and air intake bellows 5 generalized sections; Be difference preheating, the difference air feed of realizing primary and secondary air in the separator; Main body heating surface spaced apart in the air-cooled type cyclone separator 2 are wind heating surface and secondary wind heating surface; Simultaneously, air intake bellows 5 comprise wind inlet bellows 5a and secondary wind inlet bellows 5b, and air outlet slit bellows 6 comprise wind outlet bellows 6a and secondary wind exports bellows 6b; A wind inlet bellows 5a and a wind outlet bellows 6a are connected with a wind heating surface respectively; Secondary wind inlet bellows 5b and secondary wind outlet bellows 6b are connected with the secondary wind heating surface respectively, and one time wind outlet bellows 6a links to each other with an air compartment 7 through pipeline, and secondary wind outlet bellows 6b links to each other with overfiren air port 8 through pipeline; Like this, after the wind heating surface heating of wind by air preheater 4, through a wind heating surface of a wind inlet bellows 5a introducing separator, preheating is after a wind outlet bellows 6a directly introduces air compartment 7 one time; After the secondary wind heating surface heating of secondary wind by air preheater 4, through the secondary wind heating surface of secondary wind inlet bellows 5b introducing separator, preheating is after secondary wind outlet bellows 6b directly guides overfiren air port 8 into.Primary and secondary air heating surface area ratio is 6: 4～5: 5 in the air-cooled type cyclone separator 2, to realize the proportioning of primary and secondary air under different fuel, the different combustion conditions.
Operation principle of the present invention: cold air is sent in the air preheater 4 by air blast, and primary and secondary air is carried out preheating respectively, sends into the air intake bellows 5 of air-cooled type cyclone separator 2 after air is drawn by air preheater 4; Primary and secondary air is bottom-up flowing in the membrane wall heating surface of separator or air compartment, realizes the cooling to separator, and air is heated simultaneously; Hot-air is drawn via the air outlet slit bellows 6 of separator and is sent into air compartment 7 and overfiren air port 8 respectively, realizes that the primary and secondary air of boiler is supplied with; Coal and desulfurizing agent are sent into burner hearth 1 by coal feeding hole and desulfurizing agent inlet respectively and are burnt and desulphurization reaction; The high-temperature flue gas that produces in the burner hearth 1 is carrying a large amount of material particles and is getting in the air-cooled type cyclone separator 2; Centrifugation through separator; The separated material that gets off returns the burner hearth emulsion zone through material returning valve, and flue gas then gets into back-end ductwork 3 and carries out heat exchange with convection heating surface; In back-end ductwork 3 bottoms and since air preheater reduce to save segment space, be furnished with SCR denitrating system 9, flue gas before flowing out back-end ductwork 3 with SCR denitrating system 9 in denitrification reducing agent react, remove NOx; Clean flue gas through desulphurization denitration is discharged boiler by exhanst gas outlet.
Use a kind of CFBB that has the air-cooled type cyclone separator provided by the invention; Separator adopts the air cooling; Therefore can save the segment space of the shared back-end ductwork of air preheater, thereby arrange the SCR denitrating system, the whole cooker furnace system is simple in structure; Reasonable implementation CFBB desulphurization denitration process simultaneously, build and operating cost lower.
Claims (5)
1. CFBB that has the air-cooled type cyclone separator; It contains burner hearth (1), is arranged in the overfiren air port (8) of an air compartment (7) of burner hearth bottom, burner hearth emulsion zone, cyclone separator and back-end ductwork (3); The outlet of said burner hearth (1) links to each other with the inlet of cyclone separator; The lower part outlet of cyclone separator links to each other with the burner hearth emulsion zone through feeding back device; Be furnished with high temperature superheater, low temperature superheater, economizer and air preheater (4) in the said back-end ductwork (3) successively, it is characterized in that: said cyclone separator adopts air-cooled type cyclone separator (2), the cooling of separator main body heating surface bubbling air; The bottom of this air-cooled type cyclone separator (2) is furnished with air intake bellows (5); Separator cylindrical shell top is provided with air outlet slit bellows (6), and air intake bellows (5) and air outlet slit bellows (6) are connected with the separator main body heating surface, and the separator inwall is covered with refractory material (12); The outlet of said air preheater (4) links to each other with air intake bellows (5) through pipeline; Said air outlet slit bellows (6) link to each other with overfiren air port (8) with an air compartment (7) respectively through pipeline.
2. a kind of CFBB that has the air-cooled type cyclone separator according to claim 1 is characterized in that: the main body heating surface of said air-cooled type cyclone separator (2) adopts membrane wall (11a) or air compartment (11b) structure.
3. a kind of CFBB that has the air-cooled type cyclone separator according to claim 1 and 2; It is characterized in that: the interior main body heating surface of said air-cooled type cyclone separator (2) spaced apart is wind heating surface and secondary wind heating surface; Said air intake bellows (5) comprise wind inlet bellows (5a) and the secondary wind bellows (5b) that enter the mouth; Said air outlet slit bellows (6) comprise a wind and export bellows (6a) and secondary wind outlet bellows (6b); Wind inlet bellows (5a) and a wind export bellows (6a) and are connected with a wind heating surface respectively; Secondary wind inlet bellows (5b) and secondary wind outlet bellows (6b) are connected with the secondary wind heating surface respectively, and wind outlet bellows (6a) link to each other with an air compartment (7) through pipeline, and secondary wind outlet bellows (6b) link to each other with overfiren air port (8) through pipeline.
4. a kind of CFBB that has the air-cooled type cyclone separator according to claim 1 and 2 is characterized in that: the selective catalytic-reduction denitrified system of said air preheater (4) lower disposed (9).
5. a kind of CFBB that has the air-cooled type cyclone separator according to claim 1 and 2 is characterized in that: wind heating surface in the said cyclone separator is 6: 4～5: 5 with the area ratio of secondary wind heating surface.
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| CN201210093741.XA CN102620287B (en) | 2012-03-31 | 2012-03-31 | Circulating fluidized bed boiler with air cooling type cyclone separator |
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| CN201210093741.XA CN102620287B (en) | 2012-03-31 | 2012-03-31 | Circulating fluidized bed boiler with air cooling type cyclone separator |
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| CN102620287A true CN102620287A (en) | 2012-08-01 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017329A (en) * | 2012-12-21 | 2013-04-03 | 哈尔滨工业大学 | Hot-blast stove system and method for different-speed circulating fluidized bed |
| CN108800112A (en) * | 2018-06-29 | 2018-11-13 | 安庆市凯瑞建材有限公司 | A kind of low emission biomass circulating fluidized bed hot-blast stove of mortar production |
| CN109161407A (en) * | 2018-10-16 | 2019-01-08 | 合肥德博生物能源科技有限公司 | A kind of devices and methods therefor of biomass high-adaptability, efficient positive pressure gasification coupling coal-burning boiler |
| CN111396865A (en) * | 2020-04-16 | 2020-07-10 | 东方电气集团东方锅炉股份有限公司 | High-efficient air feed system and circulating fluidized bed boiler thereof |
| CN114576619A (en) * | 2022-03-04 | 2022-06-03 | 东方电气集团东方锅炉股份有限公司 | Circulating fluidized bed boiler |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017329A (en) * | 2012-12-21 | 2013-04-03 | 哈尔滨工业大学 | Hot-blast stove system and method for different-speed circulating fluidized bed |
| CN103017329B (en) * | 2012-12-21 | 2015-02-04 | 哈尔滨工业大学 | Hot-blast stove system and method for different-speed circulating fluidized bed |
| CN108800112A (en) * | 2018-06-29 | 2018-11-13 | 安庆市凯瑞建材有限公司 | A kind of low emission biomass circulating fluidized bed hot-blast stove of mortar production |
| CN109161407A (en) * | 2018-10-16 | 2019-01-08 | 合肥德博生物能源科技有限公司 | A kind of devices and methods therefor of biomass high-adaptability, efficient positive pressure gasification coupling coal-burning boiler |
| CN109161407B (en) * | 2018-10-16 | 2024-04-30 | 合肥德博生物能源科技有限公司 | Device and method for biomass high-adaptability and high-efficiency positive pressure gasification coupling coal-fired boiler |
| CN111396865A (en) * | 2020-04-16 | 2020-07-10 | 东方电气集团东方锅炉股份有限公司 | High-efficient air feed system and circulating fluidized bed boiler thereof |
| CN111396865B (en) * | 2020-04-16 | 2024-04-30 | 东方电气集团东方锅炉股份有限公司 | High-efficient air supply system and circulating fluidized bed boiler thereof |
| CN114576619A (en) * | 2022-03-04 | 2022-06-03 | 东方电气集团东方锅炉股份有限公司 | Circulating fluidized bed boiler |
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Effective date of registration: 20190610 Address after: 100089 C1001B, 10th floor, No. 8 Courtyard, Zhongguancun East Road, Haidian District, Beijing Patentee after: Beijing Jiechuang Huarui Technology Co., Ltd. Address before: 100084 Beijing Haidian District Beijing 100084 box 82 box, Tsinghua University Patent Office Patentee before: Tsinghua University |