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	Postcombustion and Its Influences in 135 MWe CFB Boilers
	Li, Shaohua ; Yang, Hairui ; Zhang, Hai ; Liu, Qing ; Lu, Junfu ; Yue, Guangxi
	2010-10-12 ; 2010-10-12
关键词	PARTICLE HOLDUP CYCLONE COMBUSTION Energy & Fuels Engineering, Chemical
中文摘要	In the cyelone of a circulating fludized bed (CFB) boiler, a noticeable causcd by combustion of combustible gas grid unburnt carbon coolant, is of tell found, Such pliononwrioll is defined as postcombustion, and it could introduce overheating of reheated and superheated steam and extra heat loss of exhaust flue gas. In this paper, mathematical modeling and Field measurements on postcombustion in 135MWe commercial CFB boilers were conducted. A novel one-dimensional combustion model lacing postcombustion into account was, developed. With this model, the overall combustion performance, including size distribution of variotisishes, temperature profile, and carbon content profiles along the furnace height, heat release fraction in the cyclone and furnace were predicted. Field measure merits were conducted by sampling gas and solid at different positions in the boiler under different loads, he measured data and corresponding modal-calculated results Were Compared. Both prediction kind field measurements showed postcombustion introduced a temperature increment of flue gas ill the cyclone of the 135MWe CFB boiler in the range of 20-50 degrees C when a low volatile bituminous coal wits Fired. Although it had little influence on ash size distribution, postcombustion had a remarkable influence on the carbon content profile and temperature profile in the furnace. Moreover, it introduced about 4-7% heat release in the cyclone over the total heat release in the boiler. This fraction slightly increased with total air now rate and boiler load. Model calculations were also conducted on other two 135MWe CFB boilers burning lignite and anthracite coal, respectively. The results confirmed that postcombustion was sensitive to coal type and became more severe its the volatile content of the coal decreased.
语种	英语 ; 英语
出版者	AMER CHEMICAL SOC ; WASHINGTON ; 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/79904]
专题	清华大学
推荐引用方式 GB/T 7714	Li, Shaohua,Yang, Hairui,Zhang, Hai,et al. Postcombustion and Its Influences in 135 MWe CFB Boilers[J],2010, 2010.
APA	Li, Shaohua,Yang, Hairui,Zhang, Hai,Liu, Qing,Lu, Junfu,&Yue, Guangxi.(2010).Postcombustion and Its Influences in 135 MWe CFB Boilers..
MLA	Li, Shaohua,et al."Postcombustion and Its Influences in 135 MWe CFB Boilers".(2010).

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