CN202675271U - Low-nitrogen combustion device for circulating fluidized bed - Google Patents
Low-nitrogen combustion device for circulating fluidized bed Download PDFInfo
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- CN202675271U CN202675271U CN 201220316631 CN201220316631U CN202675271U CN 202675271 U CN202675271 U CN 202675271U CN 201220316631 CN201220316631 CN 201220316631 CN 201220316631 U CN201220316631 U CN 201220316631U CN 202675271 U CN202675271 U CN 202675271U
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Abstract
The utility model discloses a low-nitrogen combustion device for a circulating fluidized bed. The low-nitrogen combustion device comprises a primary air blower, a secondary air blower, a primary cold air duct, a secondary cold air duct, an air preheater, a primary hot air duct, a secondary hot air duct, a primary air distributing device, a secondary air distributing device, a secondary air pipe and a secondary air nozzle. The low-nitrogen combustion device disclosed by the utility model has the following advantages and effects: 1, the powers of the primary air blower and the secondary air blower are reduced, so that the equipment cost and operating cost are saved; 2, a primary combustion region with an anoxic reducing atmosphere is formed through reducing the proportion of the primary air, so that the quantity of NOx generated through combustion is reduced; 3, multistage combustion is formed in a furnace through the layered arrangement of the secondary air, so that the smoke temperature in a hearth is balanced, and the generation of original NOx is reduced; 4, a variable cross section is designed in a secondary air pipeline, so that the air distribution of the secondary air is more uniform and reasonable; and 5, an SNCR (Selective Non Catalytic Reduction) system is adopted for denitration, so that the smoke emission requirements can be met, therefore the equipment input cost and operating cost are both lower than those of SCR (Selective Catalytic Reduction).
Description
Technical field
The utility model technology introduction a kind of low nitrogen combustion apparatus for CFBB, for reducing the discharging of NOx in the flue gas, the utility model technology belongs to the CFBB field.
Background technology
Along with the attention of country to environmental protection, the standard of boiler smoke discharging is more and more stricter, and wherein the discharging of NOx requires newly-built heat power plant boiler discharging≤100mg/m after 2012 till now by originally not doing requirement
3, existing heat power plant boiler also will be down to≤100mg/m after being discharged into 2014
3The control of the NOx original concentration that therefore, the source of boiler NOx-burning is produced requires also just more and more higher.At present, the CFBB of many boiler producer designs, the NOx original concentration that generates in combustion process is higher, need join SCR (the outer denitration of stove) system's denitration, the ability meet the requirement of environmental protection, the denitration cost is high.Because the burning air distribution is unreasonable, the blower fan station service is high, has reduced the economy of whole power plant simultaneously.
Summary of the invention
The purpose of this utility model is to provide the burning in circulating fluid bed boiler device of a kind of reasonable in design, each part design optimization, energy-conserving and environment-protective.
It is that this recirculating fluidized bed low nitrogen combustion apparatus comprises air blast No. one time that the utility model solves the problems of the technologies described above the technical scheme that adopts, the post-blast machine, a cold air duct, the secondary cold air duct, air preheater, a hot-flow flue, the second heat air channel, air-distribution device and secondary wind distribution device, No. one time air blast links to each other with a cold air duct, the post-blast machine links to each other with the secondary cold air duct, one time cold air duct links to each other with the air preheater entrance point with the secondary cold air duct, one time hot-flow flue links to each other with the air preheater port of export with the second heat air channel, one time hot-flow flue links to each other with an air-distribution device, the second heat air channel links to each other with the secondary wind distribution device, described secondary wind distribution device is made of secondary air channel and overfire air jet, secondary air channel and overfire air jet interconnect, and described secondary air channel is varying cross-section duct.
The utility model compared with prior art has the following advantages and effect: 1, first and second power of fan reduces, and saves equipment cost and operating cost; 2, by reducing by a wind proportioning, form the primary combustion zone of the reproducibility atmosphere of an anoxic, reduce the NOx amount that burning generates; 3, the Secondary Air layering is arranged, makes to form multistage combustion in the stove, and the equilibrium that keeps flue-gas temperature in the burner hearth reduces the generation of original NOx; 4, the Secondary Air pipeline of design variable cross-section makes the Secondary Air air distribution more even rationally; 5, select the denitration of SNCR (denitration in the stove) system can reach the fume emission requirement, equipment investment cost and operating cost are all low than SCR, have good economic performance.
Description of drawings
Fig. 1 is the utility model fluidized-bed combustion boiler combustion system figure.
Fig. 2 is the utility model overfire air device detail drawing.
Label declaration: air blast 1, post-blast machine 2, cold air duct 3, secondary cold air duct 4, air preheater 5, hot-flow flue 6, second heat air channel 7, air-distribution device 8, secondary wind distribution device 9, secondary air channel 10, overfire air jet 11.
The specific embodiment
Below in conjunction with embodiment the utility model is described in further detail, following examples are to explanation of the present utility model and the utility model is not limited to following examples.
Embodiment 1: shown in Fig. 1 to 2, the utility model low nitrogen combustion apparatus is comprised of air blast 1, post-blast machine 2, cold air duct 3, secondary cold air duct 4, air preheater 5, hot-flow flue 6, second heat air channel 7, air-distribution device 8, secondary wind distribution device 9, secondary air channel 10 and an overfire air jet 11.No. one time air blast 1 links to each other with a cold air duct 3, post-blast machine 2 links to each other with secondary cold air duct 4, one time cold air duct 3 links to each other with air preheater 5 entrance points with secondary cold air duct 4, one time hot-flow flue 2 links to each other with air preheater 5 ports of export with second heat air channel 4, one time hot-flow flue 6 links to each other with an air-distribution device 8, second heat air channel 7 links to each other with secondary wind distribution device 9, described secondary wind distribution device 9 is made of secondary air channel 10 and overfire air jet 11, secondary air channel 10 and overfire air jet 11 interconnect, and described secondary air channel 10 is varying cross-section duct.
In service, the cold wind that participates in burning is delivered in cold air duct 3 and the secondary cold air duct 4 by air blast 1, a post-blast machine 2 at first respectively, then enter into air preheater 5 by flue gas, hot-air after being heated enters into air-distribution device 8 and secondary wind distribution device 9 by hot-flow flue 6 and second heat air channel 7 respectively, then is sent to burner hearth and participates in burning.Wherein enter into the secondary hot-air of secondary wind distribution device 9, via the reducing secondary air channel 10 of 2 layers of layout, be assigned in the overfire air jet 11, by overfire air jet 11 secondary hot-air is sent to burner hearth and participates in burning.
The utility model technology participates in the proportioning of the primary and secondary air of burning by adjusting fluid bed, make the burning of stove fuel more reasonable, and the main region that generates at NOx simultaneously forms the reducing atmosphere of anoxic, reduces the generation of burning NOx.In addition, secondary air distribution layered arrangement makes the Secondary Air classification participate in burning, and Temperature Distribution is more even in the stove, can further reduce the generation of NOx.By the appropriate design of air distribution device, reduce first and second wind resistance, thereby reduce power of fan, save cost.The utility model is the energy-saving environmental protection device with good economy.
In addition, need to prove, the specific embodiment described in this specification, the shape of its parts and components, institute's title of being named etc. can be different.Allly conceive equivalence or the simple change that described structure, feature and principle are done according to the utility model patent, be included in the protection domain of the utility model patent.The utility model person of ordinary skill in the field can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment; only otherwise depart from structure of the present utility model or surmount this scope as defined in the claims, all should belong to protection domain of the present utility model.
Claims (1)
1. recirculating fluidized bed low nitrogen combustion apparatus, comprise air blast No. one time, the post-blast machine, a cold air duct, the secondary cold air duct, air preheater, a hot-flow flue, the second heat air channel, air-distribution device and secondary wind distribution device, No. one time air blast links to each other with a cold air duct, the post-blast machine links to each other with the secondary cold air duct, one time cold air duct links to each other with the air preheater entrance point with the secondary cold air duct, one time hot-flow flue links to each other with the air preheater port of export with the second heat air channel, one time hot-flow flue links to each other with an air-distribution device, the second heat air channel links to each other with the secondary wind distribution device, it is characterized in that: described secondary wind distribution device is made of secondary air channel and overfire air jet, secondary air channel and overfire air jet interconnect, and described secondary air channel is varying cross-section duct.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220316631 CN202675271U (en) | 2012-07-03 | 2012-07-03 | Low-nitrogen combustion device for circulating fluidized bed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220316631 CN202675271U (en) | 2012-07-03 | 2012-07-03 | Low-nitrogen combustion device for circulating fluidized bed |
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| Publication Number | Publication Date |
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| CN202675271U true CN202675271U (en) | 2013-01-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220316631 Expired - Fee Related CN202675271U (en) | 2012-07-03 | 2012-07-03 | Low-nitrogen combustion device for circulating fluidized bed |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104482544A (en) * | 2014-12-12 | 2015-04-01 | 华西能源工业股份有限公司 | CFB (circulating fluid bed) refuse incineration boiler air distribution system |
-
2012
- 2012-07-03 CN CN 201220316631 patent/CN202675271U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104482544A (en) * | 2014-12-12 | 2015-04-01 | 华西能源工业股份有限公司 | CFB (circulating fluid bed) refuse incineration boiler air distribution system |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130116 Termination date: 20150703 |
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| EXPY | Termination of patent right or utility model |