微波间断加载对柱状煤瓦斯解吸特性的影响
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摘要
为揭示微波实时加载作用对柱状煤瓦斯解吸特性的影响,采用自主研制的微波实时加载作用下煤体瓦斯解吸渗流实验装置,开展了无微波作用及微波间断加载作用下柱状煤瓦斯解吸对比实验。结果表明,微波间断加载对柱状煤瓦斯解吸具有明显的促进作用,微波加载时间越长,微波输出能越多,累计解吸量越大,解吸速率也相应越高。微波加载对瓦斯解吸的瞬时提速作用效果显著,经微波加载120 s,瓦斯解吸速率最大提高到加载微波前的5.1倍。动力学分析表明,动扩散系数模型可以较好地描述微波间断加载作用下柱状煤中瓦斯解吸的动力学规律,微波间断加载能够提高瓦斯扩散能力,降低扩散系数的衰减。
In order to reveal the effect of real-time microwave loading on gas desorption characteristics of cylindrical coal, comparative experiments of gas desorption of cylindrical coal without microwaves and under microwave intermittent loading were conducted by a self-developed experimental apparatus for gas desorption and seepage under real-time microwave loading. The results show that the microwave intermittent loading has a significant promotion effect on the gas desorption of cylindrical coal. The longer the microwave loading time, the higher the microwave output energy, the larger the accumulated desorption amount, the higher the desorption rate. The effect of microwave loading on the instantaneous speed increase of gas desorption is remarkable. The gas desorption rate increases up to 5.1 times after microwave loading 120 s. The dynamics analysis shows that the dynamic diffusion coefficient model can describe the dynamics of gas desorption in cylindrical coal under microwave intermittent loading well. Microwave intermittent loading can increase the gas diffusion capacity and reduce the attenuation of diffusion coefficient.
In order to reveal the effect of real-time microwave loading on gas desorption characteristics of cylindrical coal, comparative experiments of gas desorption of cylindrical coal without microwaves and under microwave intermittent loading were conducted by a self-developed experimental apparatus for gas desorption and seepage under real-time microwave loading. The results show that the microwave intermittent loading has a significant promotion effect on the gas desorption of cylindrical coal. The longer the microwave loading time, the higher the microwave output energy, the larger the accumulated desorption amount, the higher the desorption rate. The effect of microwave loading on the instantaneous speed increase of gas desorption is remarkable. The gas desorption rate increases up to 5.1 times after microwave loading 120 s. The dynamics analysis shows that the dynamic diffusion coefficient model can describe the dynamics of gas desorption in cylindrical coal under microwave intermittent loading well. Microwave intermittent loading can increase the gas diffusion capacity and reduce the attenuation of diffusion coefficient.
引文
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[17] 李志强, 成墙, 刘彦伟, 等.柱状煤芯瓦斯扩散模型与扩散特征实验研究[J]. 中国矿业大学学报, 2017, 46(5): 1033-1040 Li Z Q, Cheng Q , Liu Y W, et al. Research on gas diffusion model and experimental diffusion characteristic of cylindrical coal[J]. Journal of China University of Mining and Technology, 2017, 46(5): 1033-1040
[18] 王兆丰. 空气、水和泥浆介质中煤的瓦斯解吸规律与应用研究[D]. 徐州: 中国矿业大学, 2001 Wang Z F. Study on the gas desorption laws of coal in the media of air, water and drilling mud and their applications[D]. Xuzhou: China University of Mining and Technology, 2001王志军男,1979年生,副教授,博士。主要从事矿井通风与瓦斯灾害防治研究。E-mail: wzj0537@163.com
[2] 王志军, 宋文婷, 马小童, 等. 温度对煤体瓦斯吸附特性影响实验分析[J]. 河南理工大学学报(自然科学版), 2014, 33(5): 553-557 Wang Z J, Song W T, Ma X T, et al. Analysis of experiments for the effect of temperature on adsorbing capability of coal[J]. Joural of Henan Polytechnic University(Natural Science), 2014, 33(5): 553-557
[3] Hu G Z, Xu J L, Ren T, et al. Adjacent seam pressure-relief gas drainage technique based on ground movement for initial mining phase of longwall face[J]. International Journal of Rock Mechanics and Mining Sciences, 2015, 77: 237-245
[4] 王恩元, 张力, 何学秋. 煤体瓦斯渗透性的电场响应研究[J]. 中国矿业大学学报, 2004, 33(1): 62-65 Wang E Y, Zhang L, He X Q. Electric field response of gas permeability of coal[J]. Journal of China University of Mining and Technology, 2004, 33(1): 62-65
[5] 何学秋, 张力. 外加电磁场对瓦斯吸附解吸的影响规律及作用机理的研究[J]. 煤炭学报, 2000, 25(6): 614-618 He X Q, Zhang L. Study on the effect of the addition of electromagnetic field on gas adsorption and desorption and its action mechanism[J]. Journal of China Coal Society, 2000, 25(6): 614-618
[6] 周敏, 杨絮, 宋利强, 等. 煤炭微波脱硫研究进展[J]. 河南理工大学学报(自然科学版), 2013, 32(6): 760-764 Zhou M, Yang X, Song L Q, et al. Research progress of coal microwave desulphurization[J]. Journal of Henan Polytechnic University(Natural Science), 2013, 32(6): 760-767
[7] Liu J Z, Zhu J F, Cheng J, et al. Pore structure and fractal analysis of Ximeng lignite under microwave irradiation[J]. Fuel, 2015, 146: 41-50
[8] 李贺, 林柏泉, 洪溢都, 等. 微波辐射下煤体孔裂隙结构演化特性[J]. 中国矿业大学学报, 2017, 46(6): 1194-1201 Li H, Lin B Q, Hon Y D, et al. Effect of microwave irradiation on pore and fracture evolutions of coal[J]. Journal of China University of Mining and Technology, 2017, 46(6): 1194-1201
[9] Hong Y D, Lin B Q, Zhu C J, et al. Influence of microwave energy on fractal dimension of coal cores: implications from nuclear magnetic resonance[J]. Energy & Fuels, 2016, 30: 10253-10259
[10] Hemant K, Edward L, Sam K. Inducing fractures and increasing cleat apertures in a bituminous coal under isotropic stress via application of microwave energy[J]. International Journal of Coal Geology, 2011, 88 (1): 75-82
[11] 戴俊, 杜文平, 吴涛, 等. 微波照射和冲击荷载作用后岩石裂纹试验研究[J]. 河南理工大学学报(自然科学版), 2016, 35(3): 420-423 Dai J, Du W P, Wu T, et al. Experimental study of rock fracture after microwave irradiation and impact load[J].Journal of Henan Polytechnic University(Natural Science), 2016, 35(3): 420-423
[12] 胡国忠, 黄兴, 许家林, 等. 可控微波场对煤体的孔隙结构及瓦斯吸附特性的影响[J]. 煤炭学报, 2015, 40(S2): 374-379 Hu G Z, Huang X, Xu J L, et al. Effect of microwave field on pore structure and absorption of methane in coal[J]. Journal of China Coal Society, 2015, 40(S2):374-379
[13] 温志辉, 代少华, 任喜超, 等. 微波作用对颗粒煤瓦斯解吸规律影响的实验研究[J]. 微波学报, 2015, 31(6): 91-96 Wen Z H, Dai S H, Ren X C, et al. Experimental study on the effect of microwave on particles coal gas desorption rule[J]. Journal of Microwaves, 2015, 31(6):91-96
[14] 胡国忠, 朱怡然, 许家林, 等. 可控源微波场强化煤体瓦斯解吸扩散的机理研究[J]. 中国矿业大学学报, 2017, 46(3): 433-438 Hu G Z, Zhu Y R, Xu J L, et al. Mechanism of the controlled microwave field enhancing gas desorption and diffusion in coal[J]. Journal of China University of Mining and Technology, 2017, 46(3): 433-438
[15] Crank J. The mathematics of diffusion[M]. Oxford:Oxford University Press, 1975
[16] 李志强, 刘勇, 许彦鹏, 等. 煤粒多尺度孔隙中瓦斯扩散机理及动扩散系数新模型 [J]. 煤炭学报, 2016, 41(3): 633-642 Li Z Q, Liu Y, Xu Y P, et al. Gas diffusion mechanism in multi-scale pores of coal particles and new diffusion model of dynamic diffusion coefficient[J]. Journal of China Coal Society, 2016, 41(3): 633-642
[17] 李志强, 成墙, 刘彦伟, 等.柱状煤芯瓦斯扩散模型与扩散特征实验研究[J]. 中国矿业大学学报, 2017, 46(5): 1033-1040 Li Z Q, Cheng Q , Liu Y W, et al. Research on gas diffusion model and experimental diffusion characteristic of cylindrical coal[J]. Journal of China University of Mining and Technology, 2017, 46(5): 1033-1040
[18] 王兆丰. 空气、水和泥浆介质中煤的瓦斯解吸规律与应用研究[D]. 徐州: 中国矿业大学, 2001 Wang Z F. Study on the gas desorption laws of coal in the media of air, water and drilling mud and their applications[D]. Xuzhou: China University of Mining and Technology, 2001王志军男,1979年生,副教授,博士。主要从事矿井通风与瓦斯灾害防治研究。E-mail: wzj0537@163.com