放散面积对煤样瓦斯放散特性产生的影响

Influence of diffusion area on gas emission characteristics of coal specimens

采用自主研发的型煤煤样瓦斯放散试验装置,以自制型煤煤样为研究对象,通过依次密封型煤表面,研究放散面积对型煤瓦斯放散特性的影响。结果表明:随着放散面积的减小型煤瓦斯放散速度减小,这种速度减小值的差距随着放散时间延长而逐渐缩短,放散速度曲线整体近似呈"L"型,但在曲线拐点处出现了速度"超越"现象,并发现在密封型煤两对立面对放散速度的影响比密封型煤两相邻面对放散速度的影响大;不同放散面积的瓦斯累积放散量与时间的关系仍然呈有限单调增函数,即不同放散面积瓦斯放散量随时间变化规律基本一致,但在相同时间段内不同的瓦斯压力下,随着型煤放散面积的减小,瓦斯累积放散量减小。

In order to study the influence of diffusion area on gas emission characteristics,the self-made briquette specimens were taken as the research object.The test was done through sealing coal briquette surface with the self-developed briquette specimens gas emission test device.The results show that the influence of the diffusion area on the gas emission rate of the briquette decreases with the decrease of the diffusion area,but the gap between the values of velocity reduction is gradually narrowed with the extension of the dispersion time.The dispersion velocity curve is approximately L-shaped as a whole,but there is a velocity"transcendence"phenomenon at the inflection point.And it is found that the influence of the two opposite sides of the sealed briquette on the emission velocity is greater than that of the two adjacent faces of sealed briquette and the influence of the diffusion area on the gas emission of the briquette shows that the relation between the cumulative discharge and the time in different diffusion areas is still a finite monotonic increasing function.However,in the same period of time and under different gas pressures,the cumulative discharge is reduced with the derease of the area of briqutte.