CN102927564B - Method of reducing fly ash carbon content of circulating fluidized bed boiler - Google Patents
Method of reducing fly ash carbon content of circulating fluidized bed boiler Download PDFInfo
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- CN102927564B CN102927564B CN201210509207.2A CN201210509207A CN102927564B CN 102927564 B CN102927564 B CN 102927564B CN 201210509207 A CN201210509207 A CN 201210509207A CN 102927564 B CN102927564 B CN 102927564B
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- oxygen
- fly ash
- fluidized bed
- flying dust
- circulating fluidized
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention discloses a method of reducing fly ash carbon content of a circulating fluidized bed boiler, wherein the method comprises the following steps when the circulating fluidized bed boiler comprises a hearth, a cyclone separator, a vertical pipe and a feedback device: 1) mounting a helical feeder on the upper part of the vertical part, and connecting an oxygen-enriched air generator at the air inlet chamber on the bottom part of the feedback device; and 2) when the circulating fluidized bed boiler operates, the helical feeder conveys the fly ash to the upper part of the vertical part, the fly ash enters the feedback device through the vertical pipe, the coke in the fly ash in the feedback device and the oxygen-enriched air generated by the oxygen-enriched air generator generate an oxygen-enriched combustion reaction, in the reaction, the percent by volume of the oxygen in the oxygen-enriched air is controlled to control the combustion temperature of the fly ash, and the fly ash and the flue gas return to the hearth after the reaction. The method disclosed by the invention can be applied on circulating fluidized bed boilers of burning inferior coal, and the method can greatly increase the combustion reaction speed and standing time of the coke in the fly ash in the high temperature region of the circulating fluidized bed boiler and greatly reduce the fly ash carbon content of the circulating fluidized bed boiler.
Description
Technical field
The present invention relates to the technical field reducing boiler flyash carbon content, particularly relate to a kind of method reducing CFBB unburned carbon in flue dust.
Background technology
CFBB has the outstanding advantages such as fuel tolerance is wide, pollutant emission is low and is able to extensive use.But, there is the higher problem of unburned carbon in flue dust in burning in circulating fluid bed boiler colm, especially low volatile colm, unburned carbon in flue dust up to 10% ~ 25%, can reduce boiler efficiency, adds energy loss, and limits the comprehensive utilization of flying dust.
At present, for the problem that CFB boiler flyash carbon content is high, more existing solutions, can referenced patent---raising burning in circulating fluid bed boiler method and device (number of patent application is 200310106047.8) and patent at the bottom of difficult combustion fuel flying dust---convergent increaser and gray back pump and flyash reburning type CFBC equipment (number of patent application is 200710054674.X), burn in the bottom of cinder reinjection to burner hearth emulsion zone by the former, burn in the top of cinder reinjection to emulsion zone by the latter, two kinds of methods are all because fluidising air velocity in stove is higher, be generally 5 ~ 7m/s, flying dust is in the time of staying in furnace high-temperature district short reason, CFBB unburned carbon in flue dust is made to reduce amplitude very limited.
Summary of the invention
The CFBB unburned carbon in flue dust that the present invention is directed to burning inferior coal is higher, adopt existing fly ash refiring technology, flying dust is short in the time of staying in furnace high-temperature district, the very limited defect of amplitude is reduced for unburned carbon in flue dust, proposes a kind of method reducing CFBB unburned carbon in flue dust.
A kind of method reducing CFBB unburned carbon in flue dust of the present invention, when CFBB comprises burner hearth, cyclone separator, standpipe and feeding back device, described method step is as follows:
1) in riser upper, screw(-type) feeder is installed, connects oxygen-enriched air generator at feeding back device bottom air inlet room place;
2) when CFBB runs, the flying dust collected is sent into riser upper by screw(-type) feeder, flying dust enters feeding back device through standpipe, the oxygen-enriched air generation oxygen-enriched combusting that coke in feeding back device in flying dust and oxygen-enriched air generator produce reacts, in reaction, flying dust ignition temperature is controlled by regulating the percent by volume in oxygen-enriched air shared by oxygen, after reaction, flying dust and flue gas return burner hearth, enter the CFBB ash circulatory system, so repeatedly, CFBB unburned carbon in flue dust is significantly reduced.
The present invention compared with prior art, have the following advantages and high-lighting effect: flying dust is in the high temperature ash circulatory system, coke ignition temperature can be heated rapidly to, then lower fluidising air velocity is being run on, be generally 0.3 ~ 0.5m/s, be in the bed space of bubbling fluidization, coke in flying dust and oxygen-enriched air generation combustion reaction, significantly increase combustion rate and the time of staying of coke in flying dust, be conducive to the Thorough combustion of coke in flying dust, after burning, flying dust and flue gas return burner hearth, enter the CFBB ash circulatory system, so repeatedly, significantly reduce the phosphorus content of flying dust, do not affecting CFBB critical operational parameters (temperature simultaneously, fluidising air velocity) condition under, percent by volume in the oxygen-enriched air produced by regulating oxygen-enriched air generator shared by oxygen realizes the object controlling flying dust ignition temperature.
accompanying drawing illustrates:
Fig. 1 is the structural representation of the embodiment of the present invention 1
Fig. 2 is the structural representation of the embodiment of the present invention 2
Fig. 3 is the structural representation of the embodiment of the present invention 3
Fig. 4 is the structural representation of feeding back device of the present invention
Fig. 5 is the structural representation of flying dust bubbling fluidized bed of the present invention
Fig. 6 is the structural representation of external bed of the present invention
In figure: 1 is burner hearth; 2 is cyclone separator; 3 is standpipe; 4 is feeding back device; 4-1 is inlet air plenum; 4-2 is temperature element; 5 is screw(-type) feeder; 6 is external bed; 6-1 is inlet air plenum; 6-2 is cone valve; 6-3 is feed pipe; 7 is flying dust bubbling fluidized bed; 7-1 is inlet air plenum; 7-2 is cone valve; 7-3 is feed pipe; 7-4 is temperature element; 8 is oxygen-enriched air generator.
detailed description of the invention:
Be described further as follows below in conjunction with Figure of description and embodiment to method of the present invention.
Embodiment 1
As shown in Figure 1, the CFBB of the present embodiment comprises burner hearth 1, cyclone separator 2, standpipe 3 and feeding back device 4, and its step of method that the present embodiment a kind of reduces CFBB unburned carbon in flue dust is as follows:
1) in distance 500mm ~ 2000mm place, standpipe 3 top level, screw(-type) feeder 5 is installed, according to long-term field trial and experience, space negative pressure within distance standpipe 3 top 500mm is larger, the flying dust sending into standpipe 3 cannot enter the Circulating Fluidized Bed Ash circulatory system, directly escape out from cyclone separator 2, fly ash refiring cannot be realized, space malleation beyond distance standpipe 3 top 2000mm is larger, flying dust is sent into standpipe 30 points of difficulties by screw(-type) feeder 5, in distance, screw(-type) feeder 5 is installed at 500mm ~ 2000mm place, standpipe 3 top, screw(-type) feeder 5 can be continuous, reliable delivery flying dust, oxygen-enriched air generator 8 is connected at 4-1 place, feeding back device 4 bottom air inlet room,
2) when CFBB runs, the circulating ash particle of experience burning enters cyclone separator 2 with air-flow from burner hearth 1, through the centrifugation of cyclone separator 2, the circulating ash particle separated drops to feeding back device 4 through standpipe 3, burner hearth 1 is returned together with the fuel added after feeding back device 4, so repeatedly, form the CFBB ash circulatory system, the flying dust that cyclone separator 2 does not separate is collected, the flying dust collected is sent into standpipe 3 top by screw(-type) feeder 5, the mass percent that the flying dust amount of feeding standpipe 3 and cyclone separator 2 separate the circulating ash total amount entering feeding back device 4 is less than 10%, according to field experience, the mass percent that the flying dust amount of feeding standpipe 3 and cyclone separator 2 separate the circulating ash total amount entering feeding back device 4 is less than 10%, burn the grey circulatory system temperature that improves still lower than ash fusion point by coke in flying dust, effectively prevent high-temperature coking, flying dust enters feeding back device 4 through standpipe 3, the oxygen-enriched air generation oxygen-enriched combusting that coke in feeding back device 4 in flying dust and oxygen-enriched air generator 8 produce reacts, percent by volume in oxygen-enriched air shared by oxygen is 25% ~ 45%, described percentage range 25% ~ 45% is the optimized scope of effective raising boiler efficiency that oxygen-enriched combustion technology field generally believes, in reaction, flying dust ignition temperature is controlled by regulating the percent by volume in oxygen-enriched air shared by oxygen, flying dust ignition temperature is obtained by temperature element 4-2, after reaction, flying dust and flue gas return burner hearth 1, enter the CFBB ash circulatory system, so repeatedly, CFBB unburned carbon in flue dust is significantly reduced.
Embodiment 2
As shown in Figure 2, the circulating fluid bed boiler structure of the present embodiment is identical with embodiment 1, and its step of method that the present embodiment a kind of reduces CFBB unburned carbon in flue dust is as follows:
1) flying dust bubbling fluidized bed 7 is set separately in the CFBB ash circulatory system, feeding back device 4 is installed cone valve 7-2, the feed pipe 7-3 of flying dust bubbling fluidized bed 7 is connected at cone valve 7-2 ash hole place, at the downward-sloping installation screw(-type) feeder 5 in feed pipe 7-3 top, connect burner hearth 1 in flying dust bubbling fluidized bed 7 exit, connect oxygen-enriched air generator 8 at 7-1 place, flying dust bubbling fluidized bed 7 bottom air inlet room;
2) when CFBB runs, the circulating ash particle of experience burning enters cyclone separator 2 with air-flow from burner hearth 1, through the centrifugation of cyclone separator 2, the circulating ash particle separated drops to feeding back device 4 through standpipe 3, part circulating ash directly returns burner hearth 1 after feeding back device 4 together with the fuel added, all the other circulating ash particles send into feed pipe 7-3 through cone valve 7-2, flying dust bubbling fluidized bed 7 is entered through feed pipe 7-3, then burner hearth 1 is returned, so repeatedly, form the CFBB ash circulatory system, the flying dust that cyclone separator 2 does not separate is collected, the flying dust collected is sent into flying dust bubbling fluidized bed 7 feed pipe 7-3 top by screw(-type) feeder 5, flying dust enters flying dust bubbling fluidized bed 7 through feed pipe 7-3, the oxygen-enriched air generation oxygen-enriched combusting that coke in flying dust bubbling fluidized bed 7 in flying dust and oxygen-enriched air generator 8 produce reacts, in reaction, flying dust ignition temperature is controlled by regulating the percent by volume in oxygen-enriched air shared by oxygen, flying dust ignition temperature is obtained by temperature element 7-4, after reaction, flying dust and flue gas return burner hearth 1, enter the CFBB ash circulatory system, so repeatedly, CFBB unburned carbon in flue dust is significantly reduced.
Embodiment 3
As shown in Figure 3, the CFBB of the present embodiment comprises burner hearth 1, cyclone separator 2, standpipe 3 and feeding back device 4 and external bed 6, and its step of method that the present embodiment a kind of reduces CFBB unburned carbon in flue dust is as follows:
1) at the downward-sloping installation screw(-type) feeder 5 in external bed 6 feed pipe 6-2 top, oxygen-enriched air generator 8 is connected at 6-1 place, external bed 6 bottom air inlet room;
2) when CFBB runs, the circulating ash particle of experience burning enters cyclone separator 2 with air-flow from burner hearth 1, through the centrifugation of cyclone separator 2, the circulating ash particle separated drops to feeding back device 4 through standpipe 3, part circulating ash directly returns burner hearth 1 after feeding back device 4 together with the fuel added, all the other circulating ash send into feed pipe 6-3 through cone valve 6-2, external bed 6 is entered through feed pipe 6-3, then burner hearth 1 is returned, so repeatedly, form the CFBB ash circulatory system, flying dust is sent into the feed pipe 6-3 top of external bed 6 by screw(-type) feeder 5, flying dust enters external bed 6 through feed pipe 6-3, the oxygen-enriched air generation oxygen-enriched combusting that coke in external bed 6 in flying dust and oxygen-enriched air generator 8 produce reacts, in reaction, flying dust ignition temperature is controlled by regulating the percent by volume in oxygen-enriched air shared by oxygen, after reaction, flying dust and flue gas return burner hearth 1, enter the CFBB ash circulatory system, so repeatedly, CFBB unburned carbon in flue dust is significantly reduced.
Claims (1)
1. reduce a method for CFBB unburned carbon in flue dust, when CFBB comprise burner hearth (1), cyclone separator (2), standpipe (3) and feeding back device (4) time, it is characterized in that: the method step is as follows:
1) in distance 500mm ~ 2000mm place, standpipe (3) top level, screw(-type) feeder (5) is installed, connects oxygen-enriched air generator (8) at feeding back device (4) bottom air inlet room (4-1) place;
2) when CFBB runs, the flying dust collected is sent into standpipe (3) top by screw(-type) feeder (5), the mass percent that the flying dust amount of feeding standpipe (3) and cyclone separator (2) separate the circulating ash total amount entering feeding back device (4) is less than 10%, flying dust enters feeding back device (4) through standpipe (3), the oxygen-enriched air generation oxygen-enriched combusting that coke in feeding back device (4) in flying dust and oxygen-enriched air generator (8) produce reacts, after reaction, flying dust and flue gas return burner hearth (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210509207.2A CN102927564B (en) | 2012-12-04 | 2012-12-04 | Method of reducing fly ash carbon content of circulating fluidized bed boiler |
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| CN201210509207.2A CN102927564B (en) | 2012-12-04 | 2012-12-04 | Method of reducing fly ash carbon content of circulating fluidized bed boiler |
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| CN102927564B true CN102927564B (en) | 2015-04-08 |
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| CN103451414A (en) * | 2013-09-22 | 2013-12-18 | 武汉科技大学 | Stone coal decarbonization device of multi-bed circulating fluidized bed |
| CN105444160B (en) * | 2014-08-29 | 2019-01-08 | 中国科学院工程热物理研究所 | Recirculating fluidized bed fine ash burner |
| CN105546528A (en) * | 2016-01-27 | 2016-05-04 | 北京热华能源科技有限公司 | Material circulating system and operation method of multi-process circulating fluidized bed boiler |
| CN106016296B (en) * | 2016-07-28 | 2018-02-16 | 江苏海事职业技术学院 | A kind of waste incinerator with Remote |
| CN106238443B (en) * | 2016-09-22 | 2018-07-10 | 新奥科技发展有限公司 | A kind of processing method of two spin-off ashes |
| WO2020039117A1 (en) * | 2018-08-24 | 2020-02-27 | Sumitomo SHI FW Energia Oy | An arrangement for and a method of controlling flow of solid particles and a fluidized bed reactor |
| CN109185874A (en) * | 2018-10-31 | 2019-01-11 | 袁世杰 | A kind of boiler material-returning device |
| CN110052156A (en) * | 2019-04-01 | 2019-07-26 | 浙江菲达环保科技股份有限公司 | A kind of Hg, SO based on active carbon and flying dust bubbling bed3Cooperation-removal device |
| CN110631007A (en) * | 2019-09-09 | 2019-12-31 | 中国科学院工程热物理研究所 | Hot semicoke direct combustion system and method |
| CN114234178B (en) * | 2021-11-02 | 2022-07-12 | 平湖弘欣热电有限公司 | Fly ash recirculation system of fluidized bed boiler |
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