煤在2种不同体系的生气能力研究

STUDY ON THE GAS GENERATING ABILITY OF COAL IN DIFFERENT SYSTEMS

分别采用了封闭体系和半开放体系对同一煤样的生气能力进行了模拟。实验结果表明:在半开放体系和封闭体系中,煤的生气过程有比较大的差别;煤在封闭体系中开始生气温度、生气高峰对应的温度点都比半开放体系低;在同一温度点,煤在半开放体系生气量比封闭体系少的一个原因是由于半开放体系中重烃气体和液态烃能及时排出,在高温阶段未裂解成甲烷的缘故;压力可能对气体的生成有促进作用;生烃体系的开放(或封闭)程度对煤生气过程影响非常大。

In this paper, the authors simulated the gas generating ability of coal in semi-opened and closed systems. The results show that there is a great difference in the gas generating process of coal in the two systems. The temperatures at which coal begins to generate gas and the gas-generating peak appears in the semi-opened system are higher than those in the closed system. The generated gas amount in the semi-opened system is less than that in the closed system at the same temperature, one reason for this is that the heavy hydrocarbons can be expelled out in the semi-opened system and can not be cracked into methane at high temperatures. The pressure can be an advantage for gas generation. The opening degree of a system has a great influence on the gas generation ability of coal.