Experiment on influence of different pH values on gas adsorption characteristics of acidified coal samples

QIAN Wang; CHEN Xi’ang; CHEN Xunlu; YANG Xiaobin

Safety in Coal Mines > 2021 > 52(6): 12-16,23.

QIAN Wang, CHEN Xi’ang, CHEN Xunlu, YANG Xiaobin. Experiment on influence of different pH values on gas adsorption characteristics of acidified coal samples[J]. Safety in Coal Mines, 2021, 52(6): 12-16,23.

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Experiment on influence of different pH values on gas adsorption characteristics of acidified coal samples

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Published Date: June 19, 2021

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Abstract

Abstract

In order to explore and select the appropriate acid solution to improve the permeability of coal, experiments were carried out to study on the adsorption characteristics of coal samples modified by acid solution at different pH values. Through collecting coking coal samples, eight groups of raw coal and acidification modified coal samples with different pH values were prepared. The industrial analysis and physical parameters test of the samples were carried out, and then the isothermal gas adsorption test was carried out. The experimental results show that: compared to the raw coal sample, acidification modified can reduce the ash content of coal sample without changing volatile coal sample; the true density of the modified sample is similar to that of the raw coal sample, but the apparent density decreases slightly. With the increase of pressure, the gas adsorption capacity of the modified coal sample is obviously greater than that of the raw coal sample. The adsorption constant a decreases with the increase of pH value（except pH=1）, while the adsorption constant b generally decreases with the increase of pH value. The results show that the pore structure of coal body can be changed and the adsorption capacity of coal body can be increased by selecting appropriate pH value solution to modify the specific coal seam, realize the effect of coal seam permeability enhancement finally.
- acidification modification,
- isothermal adsorption test,
- adsorption constant,
- pH value,
- coal seam permeability enhancement,
- gas adsorption

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[1]	袁亮．瓦斯治理理念和煤与瓦斯共采技术[J]．中国煤炭，2010，36（6）：5－12. YUAN Liang. Concept of gas control and simultaneousextraction of coal and gas[J]. China Coal, 2010, 36（6）: 5-12.
[2]	程远平，付建华，俞启香．中国煤矿瓦斯抽采技术的发展[J]．采矿与安全工程学报，2009，26（2）：127－139. CHENG Yuanping, FU Jianhua, YU Qixiang. Development of gas extraction technology in coal mines of China[J]. Journal of Mining & Safety Engineering, 2009, 26（2）: 127-139.
[3]	王剑光．煤矿瓦斯综合抽采技术及应用[J]．中国煤炭，2014，40（3）：111－115. WANG Jianguang. Comprehensive gas drainage technology and its application in coal mines[J]. China Coal, 2014, 40（3）: 111-115.
[4]	叶建平，史保生．中国煤储层渗透性及其主要影响因素[J]．煤炭学报，1999，24（2）：118－122. YE Jianping, SHI Baosheng. Coal reservoir permeability and its controlled factors in China[J]. Journal of China Coal Society, 1999, 24（2）: 118-122.
[5]	张群，冯三利，杨锡禄．试论我国煤层气的基本储层特点及开发策略[J]．煤炭学报，2001，26（3）：230－235. ZHANG Qun, FENG Sanli, YANG Xilu. Basic reservoir characteristics and development strategy of coalbed methane resource in China[J]. Journal of China Coal Society, 2001, 26（3）: 230-235.
[6]	李玲，汤达祯，许浩，等．柳林地区煤层渗透率影响因素及模糊综合评价[J]．洁净煤技术，2013，19（5）：105－111. LI Ling, TANG Dazhen, XU Hao, et al. Influencing factors of Liulin Coal seam permeability and its fuzzy comprehensive evaluation[J]. Clean Coal Technology, 2013, 19（5）: 105-111.
[7]	薄冬梅，赵永军，姜林．煤储层渗透性研究方法及主要影响因素[J]．油气地质与采收率，2008，15（1）：18. BO Dongmei, ZHAO Yongjun, JIANG Lin. Research method and main influencing factors of coal reservoir permeability[J]. Petroleum Geology and Recovery Efficiency, 2008, 15 （1）: 18.
[8]	袁亮．我国深部煤与瓦斯共采战略思考[J]．煤炭学报，2016，41（1）： 1－6. YUAN Liang. Strategic thinking of simultaneous exploitation of coal and gas in deep mining[J]. Journal of China Coal Society, 2016, 41（1）: 1-6.
[9]	袁亮，薛俊华，张农，等．煤层气抽采和煤与瓦斯共采关键技术现状与展望[J]．煤炭科学技术，2013，41（9）：6－11. YUAN Liang, XUE Junhua, ZHANG Nong, et al. Development orientation and status of key technology for mine underground coal bed methane drainage as well as coal and gas simultaneous mining[J]. Coal Science and Technology, 2013, 41（9）: 6-11.
[10]	唐建平，武文宾，戴林超，等．水力冲孔注水压力对煤层增透效果的影响研究[J]．矿业研究与开发，2019， 39（11）：68－73. TANG Jianping, WU Wenbin, DAI Linchao, et al. Influence of water injection pressure of hydraulic punching on the permeability effect of coal seam[J]. Mining Research and Development, 2019, 39（11）: 68-73.
[11]	赵宝友，王海东．我国低透气性本煤层增透技术现状及气爆增透防突新技术[J]．爆破，2014，31（3）：32. ZHAO Baoyou, WANG Haidong. Different technologies of permeability enhancement of single coal seam in China and new technique of high pressure gas shock[J]. Blasting, 2014, 31（3）: 32.
[12]	马铁华，崔春生，肖文聪．煤层气井高能气体压裂器性能测试系统的研究[J]．煤炭学报，2014，39（9）：1857－1861. MA Tiehua, CUI Chunsheng, XIAO Wencong. Experimental study on the performance test system of high energy gas fracturing apparatus in coal-bed methane extraction[J]. Journal of China Coal Society, 2014, 39（9）: 1857-1861.
[13]	樊少武．提高煤层透气性的理论研究[J]．煤炭工程，2005（9）：61－63. FAN Shaowu. Theoretical study to improve seam permeability[J]. Coal Engineering, 2005（9）: 61-63.
[14]	杨娟，许思雨，戴俊，等．活化过硫酸铵溶液对煤样氧化增透的实验研究[J]．煤炭学报，2020，45（4）：1488－1498. YANG Juan, XU Siyu, DAI Jun, et al. Experimental study on oxidative improving-permeability of coal samples with activated ammonium persulfate solution[J]. Journal of China Coal Society, 2020, 45（4）: 1488-1498.
[15]	竹涛，刘恩彤，景伟东．改性活性炭表面特性及其对甲烷吸附性能的影响[J]．矿业安全与环保，2017，44（2）：7. ZHU Tao, LIU Entong, JING Weidong. Surface characteristics of modified activated carbon and their influence on adsorption capacity to methane[J]. Mining Safety & Environmental Protection, 2017, 44（2）: 7.
[16]	郭红玉，苏现波，陈俊辉，等．二氧化氯对煤储层的化学增透实验研究[J]．煤炭学报，2013，38（4）：633. GUO Hongyu, SU Xianbo, CHEN Junhui, et al. Experimental study on chemical permeability improvement of coal reservoir using chlorine dioxide[J]. Journal of China Coal Society, 2013, 38（4）: 633.
[17]	李瑞，王坤，王于健．提高煤岩渗透性的酸化处理室内研究[J]．煤炭学报，2014，39（5）：913－917. LI Rui, WANG Kun, WANG Yujian. Indoor study on acidification for enhancing the permeability of coal[J]. Journal of China Coal Society, 2014, 39（5）: 913-917.
[18]	倪小明，李全中，王延斌，等．多组分酸对不同煤阶煤储层化学增透实验研究[J]．煤炭学报，2014，39（Ｓ2）：436－440. NI Xiaoming, LI Quanzhong, WANG Yanbin, et al. Experimental study on chemical permeability improvement of different rank coal reservoirs using multi-component acid[J]. Journal of China Coal Society, 2014, 39（S2）: 436-440.
[19]	周春杰，杨小彬．酸液改性煤的瓦斯吸附规律试验研究[J]．煤矿安全，2017，48（5）：15－18. ZHOU Chunjie, YANG Xiaobin. Experimental study on gas adsorption laws of acid modified coal samples[J]. Safety in Coal Mines, 2017, 48（5）: 15-18.

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