Reaction Kinetic Analysis of Bituminous Coal Char Gasified by CO2

CO2- gasification behaviors of Shenfu bituminous coal from China were investigated by thermogravi-metric analyzer within the temperature range of 1173-1323 K, and the pressure from 0.1 to 3.0 MPa. The effects of the temperature and pressure on the CO2 gasification of Shenfu char and the relationship between the gasification rate and gasification time in reactor were analyzed. It is found that the reaction rate presents normal distribution with gasification time and a normal distribution model is proposed to fit the kinetics data. Compared with the random pore model, the normal distribution model can be used to describe the gasification rate varying with gasification time at different temperature and pressure. The gasification time t(m) for maximum gasification rate obeys the following equation as the function of reaction temperature: ln t(m) = a + b(1/T). r(m), r(0) were calculated by a normal distribution model following Arrenius law.