摘要
应用煤热解的分布活化能机理 ,考虑热解热效应以及热解产物在煤粒内部的传热传质 ,提出了大颗粒煤在移动床中的热解模型 .该模型可以预测煤热解过程析出挥发分份额、温度等参数在煤粒内的分布及其随时间变化的规律 .对大颗粒煤在移动床中对流和辐射传热条件下的热解进行了数值模拟 ,计算结果表明 ,大颗粒煤的热解必须考虑煤的热解热效应 ,而热解产物的传质冷却效应则可以忽略 .同时 ,讨论了煤粒表层和中心的热解状况以及颗粒直径。
The mathematical model with distributed activation energy mechanism for devolatilization of large coal particles in a moving bed was proposed on the basis of the distributed activation energy mechanism for coal devodatilization. The devolatilization heat and the cooling effect of the volatile matter were considered in the model. The model can predict the time-volatile matter released and time-temperature history for the devolatilization of large coal particles. Numerical simulations for the devolatilization of large coal particles in convective and radiative environments were carried out. The calculation results show that the devolatilization heat can not be neglected while the cooling effect of the devolatilization products can be neglected. The influences of the particle diameter, the moving bed temperature and the radiative heat flux on the devolatilization process were also studied.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2001年第5期733-736,共4页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金资助项目 ( 5 980 6 0 0 9)
关键词
大颗粒煤
热解
热效应
传热传质
Coal
Decomposition
Heat transfer
Mass transfer
Particles (particulate matter)
Thermal effects
