固体热载体煤热解过程模拟与传热分析  

Process simulation and heat transfer analysis for coal pyrolysis using solid heat carrier

作　　者：姚金松[1] 李初福[1] 郜丽娟[1] 张峰[1] 翁力[1] 

机构地区：[1]神华集团有限责任公司,北京低碳清洁能源研究所,北京102209

出　　处：《计算机与应用化学》2015年第11期1353-1356,共4页Computers and Applied Chemistry

基　　金：国家高新技术研究发展计划(863)项目(2011AA05A202)

摘　　要：固体热载体煤热解是实现碎煤分质利用的有效方式之一。本文建立了固体热载体煤热解过程数学模型,通过求解模型得到不同粒径煤热解所需要的时间。结果表明,随着煤粒径的增加,完成热解所需要的时间显著增加,如直径为5 mm的煤颗粒完成热解需要约5 min,直径为20 mm的煤颗粒完成热解则需要约15 min。煤热解过程传热分析表明,煤热解过程传热阻力主要集中在煤颗粒内部,占总热阻比例达到50%以上,并随粒径增大而增大。本文所得到的数学模型及模拟结果,可为固体热载体煤热解反应器设计、工艺优化和节能分析提供参考。Coal pyrolysis with solid beat carrier is one of the effective ways to realize the staged utilization of small size coal. In this paper, a mathematical model of coal pyrolysis using solid heat carrier is established. By solving the mathematical model, it can obtain the time for the coal pyrolysis with different particle sizes. The result shows that the required time of coal pyrolysis is increased obviously as the particle size increases. For example, the coal particle of 5 mm diameter needs 5 minutes to complete pyrolysis, while the coal particle of 20mm diameter need 15 minutes to complete pyrolysis. By analyzing the heat transfer of coal pyrolysis, we can know the thermal resistance for coal pyrolysis is mainly focused on the inside of coal particle. The inner thermal resistance in coal particle is above 50 percent of the total thermal resistance, and it will increase as the particle size increases. The mathematical model and the simulation result in this paper can provide guidance for the reactor design, the process optimization and energy saving analysis of coal pyrolysis using solid heat cartier.

关 键 词：煤热解 固体热载体 停留时间 过程模拟 

分 类 号：TQ015.9[化学工程] TP391.9[自动化与计算机技术—计算机应用技术]