煤层瓦斯解吸影响因素的试验研究
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摘要
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.
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.
引文
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[6]刘高峰,张子戌,张小东,等.气肥煤与焦煤的孔隙分布规律及其吸附-解吸特征[J].岩石力学与工程学报,2009,28(8):1587-1592.
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[10]贾东旭,陈向军.强烈地震构造煤瓦斯解吸规律的试验研究[J].煤炭科学技术,2009,37(6):64-66.
[2]唐巨鹏,潘一山,李成全,等.有效应力对煤层气解吸渗流影响试验研究[J].岩石力学与工程学报,2006,25(8),1563-1568.
[3]易俊,姜永东,鲜学福.在交变电场声场作用下煤解吸吸附瓦斯特性分析[J].中国矿业,2005,14(5):70-73.
[4]孙可明,梁冰,朱月明.考虑解吸扩散过程的煤层气流固耦合渗流研究[J].辽宁工程技术大学学报:自然科学版,2001,20(4):548-549.
[5]牛国庆,颜爱华,刘明举.瓦斯吸附和解吸过程中温度变化实验研究[J].辽宁工程技术大学学报,2003,22(2):155-157.
[6]刘高峰,张子戌,张小东,等.气肥煤与焦煤的孔隙分布规律及其吸附-解吸特征[J].岩石力学与工程学报,2009,28(8):1587-1592.
[7]LEVY J H,DAYS J,KILLINGLEYJ S.Methane Capacities ofBowen Basin Coals Related to Coal Properties[J].Fuel,1997,76(9):813-819.
[8]YAO Yan?bin,LIUDa?meng,TANG Da?zhen,et al.Fractal Characterization of Adsorption-pores of Coals from NorthChina:An Investigation on CH4Adsorption Capacity of Coals[J].International Journal of Coal Geology,2008,73(1):27-42.
[9]牛国庆,颜爱华,刘明举.煤吸附和解吸瓦斯过程中温度变化研究[J].煤炭科学技术,2003,31(4):47-49.
[10]贾东旭,陈向军.强烈地震构造煤瓦斯解吸规律的试验研究[J].煤炭科学技术,2009,37(6):64-66.
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