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《JOURNAL OF FUEL CHEMISTRY AND TECHNOLOGY》 1998-06
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STUDY ON GASIFICATION REACTION OF COAL AND CHAR IN CIRCULATING FLUIDIZED BED (CFB) Ⅰ EFFECT OF OPERATING GAS VELOCITY AND SOLID CIRCULATING RATE TO GASIFICATION REACTION IN CFB

Fang Yitian Zhou Zheng Gou Jixiang Zhang Jianmin Wang Yang Zhang Bijiang (Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan)  
In this paper, a study on the gasification reaction of fly ash of Xishan coking coal in an experimental circulating fluidized bed reactor is reported The CFB gasifier heated by electrical heaters mainly consists of a riser (48mm id ×3560mm), a solidsgas separator system and a 68mm id recirculation column The fly ash reacted with CO 2 at different conditionsgas velocity and solid circulating rate The test results show that the CO concentration, carbon conversion and gasification efficiency increase when gas velocity decrease under same fuel feed rate It is mainly because of the increasing of solids holdup In addition, the reactant gas residence time increases from 2 82 seconds to 3 73 seconds when gas velocity decrease from 1 2 to 0 95m/s At same condition, the solids holdup in bed increases with the increasing of solid circulating rate Therefore, more solid particles take part in the gasification reaction, and then CO concentration and carbon conversion increase The axial CO concentration profile has correspondent relationship with that of the axial solid particle concentration
【CateGory Index】: TQ511.6
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