定压动态瓦斯解吸规律实验
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摘要
为了研究煤粒瓦斯的解吸规律,设计了恒温定压动态瓦斯吸附解吸实验,提出一种计算瓦斯累积解吸量的方法,即通过测定参考罐和样品罐的压力,计算得到两罐自由空间瓦斯量,连通后得出两罐自由空间瓦斯量分别随时间的变化,进而得到瓦斯累积解吸量随时间变化的实测曲线,研究了同一煤质不同粒径的煤样在不同初始煤粒瓦斯压力下的解吸特性.实验结果表明:煤粒瓦斯累积解吸量的倒数与时间函数成线性关系;同一粒径煤粒初始压力越大,最大瓦斯解吸量越大;相同初始压力条件下,煤粒粒径越小煤粒瓦斯解吸速率越快.该研究成果对预测煤矿瓦斯涌出量具有重要的理论指导意义.
In order to study the characteristics of gas desorption in coal particles,this study conducts a dynamic gas adsorption-desorption experiment under constant temperature and pressure,and proposes a new method for calculating accumulated gas desorption amount.With the measured pressures in sample tank and reference tank,the gas quantities in free spaces of two tanks are calculated.Once the two tanks are connected,the gas quantities in the free spaces of two tanks vary with time.Therefore,based on data processing,this study obtains the measured curve of accumulated gas desorption quantity with the change of time.The study investigates the desorption characteristics of coal samples which are in same quality but different sizes under different initial coal particles gas pressure.The experiment results show that the reciprocal of accumulated gas desorption amount and time function is in a linear relationship.For the same size coal particles,the higher the initial pressures are,the larger the maximum gas desorption amount are.Under the same initial pressure,the smaller the coal particle size is,the faster the gas desorption rate is.This study provides a significant theoretical basis for the prediction of gas emission amount in coal mine.
In order to study the characteristics of gas desorption in coal particles,this study conducts a dynamic gas adsorption-desorption experiment under constant temperature and pressure,and proposes a new method for calculating accumulated gas desorption amount.With the measured pressures in sample tank and reference tank,the gas quantities in free spaces of two tanks are calculated.Once the two tanks are connected,the gas quantities in the free spaces of two tanks vary with time.Therefore,based on data processing,this study obtains the measured curve of accumulated gas desorption quantity with the change of time.The study investigates the desorption characteristics of coal samples which are in same quality but different sizes under different initial coal particles gas pressure.The experiment results show that the reciprocal of accumulated gas desorption amount and time function is in a linear relationship.For the same size coal particles,the higher the initial pressures are,the larger the maximum gas desorption amount are.Under the same initial pressure,the smaller the coal particle size is,the faster the gas desorption rate is.This study provides a significant theoretical basis for the prediction of gas emission amount in coal mine.
引文
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[2]陈振宏,王一兵.不同煤阶煤层气吸附解吸特征差异对比[J].天然气工业,2008,28(3):30-32.Chen Zhenhong,Wang Yibing.Comparison of adsorption/desorptionproperties of cbm in different rank coals[J].Natural Gas Industry,2008,28(3):30-32.
[3]马东民,温兴宏.无烟煤对甲烷等温吸附解吸特性实验研究[J].煤田地质与勘探,2007,35(2):25-27.Ma Dongmin,Wen Xinghong.Study on adsorption/desorption characterof anthracite in CH4 isotherm experiments[J].Coal Geology&Exploration,2007,35(2):25-27.
[4]赵东,冯增朝,赵阳升.煤层瓦斯解吸影响因素的试验研究[J].煤炭科学技术,2010,38(5):43-46.Zhao Dong,Feng Zengchao,Zhao Yangsheng.Experiment study onaffected factors to seam gas desorption law[J].Coal Science andTechnology,2010,38(5):43-46.
[5]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.Liu Gaofeng,Zhang Zixu,Zhang Xiaodong,et al.Pore distribution regularityand absorption-desorption characteristics of gas coal and coking coal[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(8):1 587-1592.
[6]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.Jia dongxu,Chen Xiangjun.Test and research on gas desorption law ofintensive failed coal[J].Coal Science and Technology,2009,37(6):64-66.
[7]马东民,张遂安,蔺亚兵.煤的等温吸附-解吸实验及其精确拟合[J].煤炭学报,2011,36(3):477-480.Ma Dongmin,Zhang Suian,Lin Yabing.Isothermal adsorption anddesorption experiment of coal and experimental results accuracyfitting[J].Journal of China Coal Society,2011,36(3):477-480.
[8]马东民,韦波,蔡忠勇.煤层气解吸特征的实验研究[J].地质学报,2008,82(10):1432-1436.Ma Dongmin,Wei Bo,Cai Zhongyong.Experimental study of coalbedmethane desorption[J].Acta Geological Sinica,2008,82(10):1 432-1436.
[9]王保玉.对煤的最大含气量问题的讨论[J].西安科技大学学报,2008,28(4):674-679.Wang Baoyu.A study on maximum methane content in coal[J].Journalof Xi’an University of Science and Technology,2008,28(4):674-679.
[10]陶云奇,许江,程明俊,等.含瓦斯煤渗透率理论分析与试验研究[J].岩石力学与工程学报,2009,28(9):3363-3370.Tao Yunqi,Xu Jiang,Cheng Mingjun,et al.The recital analysis andexperimental study on permeability of gas-bearing coal[J].ChineseJournal of Rock Mechanics and Engineering,2009,28(9):3 363-3 370.
[11]安丰华,程远平,吴冬梅,等.基于瓦斯解吸特性推算煤层瓦斯压力的方法[J].采矿与安全工程学报,2011,28(1):81-85.An Fenghua,Cheng Yuanping,Wu Dongmei,et al.Determination of coalgas pressure based on characteristics of gas desorption[J].Journal ofMining&Safety Engineering,2011,28(1):81-85.
[12]王轶波,李红涛,齐黎明.低温条件下煤体瓦斯解吸规律研究[J].煤矿安全,2011,37(5):103-107.Wang Yibo,Li Hongtao,Qi Liming.Study on gas desorption law ofcoal mass at low temperatures[J].China Coal,2011,37(5):103-107.
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