煤粉热解特性实验研究  

Thermogravimetric Analysis on the Pyrolysis Characteristics of Pulverized Coal

作　　者：魏砾宏[1] 李润东[1] 李爱民[1] 李延吉[1] 姜秀民[2] 

机构地区：[1]沈阳航空工业学院清洁能源与环境工程研究所,辽宁省沈阳市110034 [2]上海交通大学机械与动力工程学院,上海市闵行区200240

出　　处：《中国电机工程学报》2008年第26期53-58,共6页Proceedings of the CSEE

基　　金：国家高技术研究发展计划基金项目(2002AA527051);辽宁省教育厅A类计划项目(2004D079)~~

摘　　要：利用热天平，以高纯氩气为气氛气体，研究了细化鹤岗煤和准噶尔煤的热解特性。实验结果表明，不同粒度的细化和超细煤粉的热失重过程可以分为4个阶段，在1400℃之前热失重微分曲线有2个失重峰。室温-400℃，各样品的失重特性无明显区别。400-980℃，粒度对煤粉失重速率间存在较好规律性。升温速率对鹤岗细煤粉热解特性的影响表现在，随着升温速率的提高，挥发分的初析温度降低；热解最大失重速率增大，达到最大失重速率的温度升高，煤粉的热解特性指数D值增大，即升温速率的增加有利于细煤粉的热解。此外，在10℃／min加热条件下，对比了平均粒径基本相同的鹤岗煤和准噶尔煤的热解特性，发现挥发分含量接近，而灰分含量较高的鹤岗煤的热解特性明显优于准噶尔煤。The pyrolysis characteristics of different particle size Hegang（HG） and Zhungaer（ZGE） coal were investigated by non-isothermal thermogravimetry in high purity argon. The results show that there are four stages （dehydration, holding, rapid weight-loss and slow weight-loss） during the non-isothermal weight loss process of different granularity coal powders, the differential thermo- gravimetry（DTG） curve has two weight loss peaks when temperatures lower than 1 400 ℃. There was no differences in the weight-loss characteristics of various samples at the temperature below 400℃. For the pyrolysis characteristics of HG coal with rising heating-up rate, the initial release temperature decreases, the maximum weight loss rate and pyrolysis index D increase. Therefore the heating-up rate increase is favorable to improving pyrolysis characteristics of pulverized coal. In addition, comparison between similar particle size HG and ZGF coal at 10 ℃/min heating rate shows that the pyrolytic characteristics of HG coal with high ash and similar volatile is better than ZGE coal.

关 键 词：煤粉 热解特性 颗粒粒度 热分析 

分 类 号：TQ530[化学工程—煤化学工程]