用重液分离和岩相分析法研究粉煤的燃烧特性

THE INVESTIGATION ON PULVERIZED COAL COMBUSTION CHARACTERISTICS WITH SPECIFIC GRAVITY CLASSIFICATION AND PETROGRAPHICAL ANALYSIS

本文按煤岩学原理将三种煤的煤粉各分为几个比重段,并分别进行了工业分析和热重分析燃烧实验。实验结果有别于除去矿物质的纯煤岩组分同类实验,认为矿物质的作用不可忽视。并且认为有灰壳的缩核燃烧模型不适用于煤粉,并认为粉煤中富集了镜质组分的比重段颗粒可做为粉煤燃烧动力学参数测定的代表样品。

Petrographic composition of coal has strong influence on it's combustion char- acteristics.In this paper,a method of studying pulverized coat combustion performance is in- troduced.According to the method of coal petrography,the pulverized coal samples were sep- arated into several parts by their specific gravity,and then each part was seperately tested by TGA.Three kinds of coal samples,Datong,Longyan and Yangquan were tested by this method. It was found that the testing results of coals with mineral matter differ greatly from that of coal petrographical composition free from minerals.The results of this method can be used readily in the practice of pulverized coal combustion.The effect of minarals on pulverized coal combustion cannot be ignored.Besides,all tests show the evidence that the shrinking core (coverd by ash layer) model cannot be used to simulate the pulverized coal combustion,and the part which is rich in vitrinite may be used as the representive sample to determine the combustion kinitic parameters.