【摘要】 采用自制的加压固定床微分反应器对加压下(达到2.0 MPa)的煤焦CO2气化动力学进行了研究分析。研究了总压和CO2分压及煤种对煤焦CO2气化反应速率的影响,分析讨论了压力对n级速率方程和L-H速率方程应用于煤焦气化反应动力学的影响。研究结果表明:均相动力学模型更适合HLH褐煤焦CO2气化反应过程,而随机孔模型更适合SM烟煤焦CO2气化反应过程;总压一定时2种煤焦CO2气化反应速率随CO2分压增大而增大,CO2分压一定时,煤焦CO2气化反应速率随总压增大而减小;对于n级速率方程,CO2分压指数随总压增大而减小,对于L-H速率方程,速率常数k1随总压增大而减小,同时速率常数k3随总压增加而增大。为了便于预测加压下煤焦CO2气化速率,文中提出了一种简单实用的经验速率方程式。更多还原

【Abstract】 The pressurized coal-char CO2 gasification kinetics was investigated under total pressure up to 2. 0 MPa by using self-made pressurized fixed bed reactor. The effects of different CO2 partial pressure,total pressure and char types on the gasification rate,and the effects of the total pressure on the parameters of the nth-order rate equation and the L-H rate equation were discussed. The results show that the homogeneous kinetic model is more suitable for the HLH lignite char-CO2 gasification reaction,and the random pore model is more suitable for the SM char-CO2 gasification reaction; char gasification rate increases with the increasing of CO2 partial pressure at a constant total pressure,and it decreases with the increasing of total pressure at a constant CO2 partial pressure; for the nth-order rate equation,reaction order with respect to CO2 decreases with the increasing of total pressure,and for the L-H rate equation,the rate constant k1 decreases with the increasing of total pressure,while the rate constant k3 increases with the increase of total pressure. In order to predict easily the coal-char gasification rate with CO2,a simple experiential rate equation was proposed.更多还原