煤层瓦斯解吸影响因素的试验研究

Experiment Study on Affected Factors to Seam Gas Desorption Law

为了研究煤层瓦斯解吸影响因素,选用屯留矿的贫煤,设计了不同含水率下的含瓦斯块煤在自然状态下和高压注水之后的常温解吸和升温强化解吸试验。采用自制的吸附-解吸-注水成套试验设备,分4个阶段对煤样进行反复的吸附和解吸,将试验结果进行对比分析。结果表明:煤对瓦斯的吸附和解吸不是完全可逆的2个过程,含水率是0和1%的煤样在常温自然状态下的解吸率分别是62.3%和67.9%,水对瓦斯的解吸影响较大;在高压注水之后,含水率为0和1%的煤样在常温自然状态下的解吸率分别为11.5%和27.5%;升温可以促使残余瓦斯的解吸,50℃时含水率为0和1%的未注水煤样,解吸率分别是常温下的1.5和1.4倍,注水后的解吸率分别是常温下的2.5和1.7倍。

In order to study the affected factors to seam gas desorption law,the normal atmospheric temperature desorption test and the temperature increased enhanced desorption test with the meager coal selected from Tunliu Mine were designed under the natural status and after high pressurized water injection of the gas bearing lump coal with different water bearing rates.A self made completed set of the gas adsorption,desorption and water injection test equipment was applied to the repeated adsorption and desorption tests with the four stages and coal samples.The comparison analysis was conducted on the test results.The results showed that the coal to gas adsorption and desorption was not fully reversible two procedures and the coal samples with water content of 0 and 1% would have a desorption rate of 62.3% and 67.9% individually at the normal atmospheric temperature,water would have a large influence to the gas desorption and after the high pressurized water injection,the coal samples with the water content of 0 and 1% would have a natural desorption rate of 11.5% and 27.5% individually at the normal atmospheric temperature.The increased temperature could make the residual gas to be desorbed.The coal samples with the water content of 0 and 1% at the temperature of 50 ℃ would have a no water injected desorption rate of 1.5 and 1.4 times higher than at the normal atmospheric temperature and have a water injected desorption rate of 2.5 and 1.7 times higher than at the normal atmospheric temperature.