EXPERIMENTS AND KINETICS MODELING FOR GASIFICATION OF BIOMASS CHAR AND COAL CHAR UNDER CO_2 AND STEAM CONDITION

摘要

Gasification behaviors of biomass char and coal char were analyzed by thermal gravimetric method, and influences of gasification temperature and different gasifying agents were investigated. At the same time, kinetics of char gasification under CO_2 condition and steam condition were investigated by Chou model. Under the same condition, gasification characteristics of biomass char are better than that of coal char, and meanwhile performance of steam is better than CO_2 as gasifying agent. From kinetics analysis, among 1173-1323K range, gasification of biomass char and coal char is under chemical reaction control both for steam and CO_2 condition. Gasification process of biomass char could be simulated by flat particle gas-solid reaction of Chou model, with activation energy as 113.7kJ/mol and76.4kJ/mol for CO_2 and steam condition respectively; gasification of coal char could be simulated by spherical particle gas-solid reaction of Chou model, with activation energy 182.6kJ/mol and 160.9kJ/mol for CO_2 and steam condition respectively.