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	Lateral gas mixing in the freeboard zone of a CFB boiler
	Yang, Jianhua ; Yang, Hairui ; Zhang, Hai ; Yue, Guangxi
	2010-05-10 ; 2010-05-10
会议名称	PROCEEDINGS OF THE 6TH INTERNATIONAL SYMPOSIUM ON COAL COMBUSTION ; 6th International Symposium on Coal Combustion ; Wuhan, PEOPLES R CHINA ; Web of Science
关键词	gas mixing CFB lateral dispersion mixing coefficient CIRCULATING FLUIDIZED-BED Energy & Fuels
中文摘要	Lateral gas mixing was experimentally studied in the freeboard zones of 3 cold CFB test rigs with different sections of 0.19ml ID, 0.3m 0.3m, 0.25m and 0.5m respectively and with the same net furnace height of 4m. Sands were used as the bed material and CO2 was used as the tracer gas. The influences of operational condition such as superficial velocity, suspension solid density, shape and size of the riser on gas mixing were studied. It was found that with particles. present in the bed the lateral gas dispersion will decrease and the highest lateral dispersion exists in a particle-free bed. The addition of solid particles will first weaken the dispersion and then as the particle load is high than a critical value, the further addition of particles may enhance gas dispersion. In this study the solid density at the transition point is about 8-10kg/m3, varying with the,suspension velocity. It is believed that such a transition is mainly caused by the transition of flow pattern in the riser. The superficial velocity has only minor influence on the gas dispersion in the range of,which, is used in an industrial CFB boiler. The effect of riser diameter on the lateral mixing coefficient is stronger than that of solid suspension density and superficial velocity. In this study and previous studies Dr increases liner with the riser's equivalent diameter.; Huazhong Univ Sci Technol
会议录出版者	HUAZHONG UNIVERSITY SCIENCE & TECHNOLOGY PRESS ; WUHAN ; YUJIASHAN, WUHAN, HUPEI, PEOPLES R CHINA
语种	英语 ; 英语
内容类型	会议论文
源URL	[http://hdl.handle.net/123456789/19653]
专题	清华大学
推荐引用方式 GB/T 7714	Yang, Jianhua,Yang, Hairui,Zhang, Hai,et al. Lateral gas mixing in the freeboard zone of a CFB boiler[C]. 见:PROCEEDINGS OF THE 6TH INTERNATIONAL SYMPOSIUM ON COAL COMBUSTION, 6th International Symposium on Coal Combustion, Wuhan, PEOPLES R CHINA, Web of Science.

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