不同孔隙压力和温度下乌盟褐煤的渗透特性研究

摘要

In order to find the empirical rule of coal permeability change during the application of the high pressure fire penetration method in underground coal gasification,the underground coal gasification high pressure test system was designed,and the permeability of briquette from Ulanchap lignite was measured.Research results show that,with the increase of pore pressure,the permeability firstly decreases then increases and decreases again.The increase of temperature makes the permeability of coal sample decrease,but the sensitivity to temperature decreases,the permeability variation of coal sample with temperature accords with exponential relation:K=ae-bt.%为了研究高压火力渗透法在煤炭地下气化气化通道贯通运用过程中,煤炭渗透率变化的经验规律,设计了煤炭地下气化高压试验系统,并对以乌兰察布褐煤制成型煤的渗透率进行了测定.研究结果表明,在常温下渗透率随着孔隙压的升高先减少再增大又减少,温度升高使煤样渗透率降低,但对温度的敏感度也随之降低,煤样渗透率随温度的变化符合指数关系:K=ae-bt.