注水对煤的瓦斯扩散特性影响

采矿与安全工程学报 ›› 2013, Vol. 30 ›› Issue (3): 443-448.

注水对煤的瓦斯扩散特性影响

1．中国矿业大学煤矿瓦斯与火灾防治教育部重点实验室，煤炭资源与安全开采国家重点实验室，江苏徐州 221116；2．河南理工大学安全科学与工程学院，河南焦作 454000

出版日期:2013-05-15 发布日期:2013-05-15
作者简介:陈向军(1980-)，男，河南省扶沟县人，讲师，博士，从事瓦斯灾害预测与防治方面的研究。 E-mail：chenxj@hpu.edu.cn Tel：13137910517
基金资助:
国家自然科学基金项目(51074160，51174081，51204065)；河南省科技攻关项目(122102310564)；煤炭资源与安全开采国家重点实验室开放研究基金项目(11KF06)；煤矿瓦斯与火灾防治教育部重点实验室开放基金项目(GFCKF201106)

Water injection impact on gas diffusion characteristic of coal mass

Online:2013-05-15 Published:2013-05-15

摘要/Abstract

摘要： 为研究注水后煤的瓦斯扩散特征及动力学参数变化，在自制的高压注水搅拌解吸装置上对不同注水量煤样在0.5 MPa吸附平衡压力下的瓦斯放散过程进行了测试，测试结果表明：不同注水量煤样瓦斯解吸量与时间的关系曲线形状均与Langmuir吸附等温线相似，不同注水量煤样均存在极限解吸量，极限解吸量随水分增加呈现指数函数式变化，当煤样水分由0.05%增加到12.04%时，极限解吸量由7.338 3 mL/g降至2.774 9 mL/g。相同吸附平衡压力下，注水量越大，煤样第1 min瓦斯解吸速度(V1)越小，解吸速度V1随水分增加呈现对数函数式变化；注水后，煤样传质毕欧准数增大，扩散系数和传质傅立叶准数减小，注水改变煤的扩散动力学参数。

关键词: 注水, 极限解吸量, 瓦斯解吸速度, 扩散参数

Abstract: To study the gas diffusion characteristic and dynamic parameters change after water injection in coal mass, the desorption process of different water injection rates in coal samples under 0.5MPa adsorption equilibrium pressure were experimented on the homemade high-pressure water injection mixing plant. The experimental results show that the relation curves between time and desorption quantities of coal samples with different water injection rates have similar shape of Langmuir’s adsorption isotherm. In addition, all the coal samples with different water injection rates have limitation desorption quantities, and the variation of limitation desorption quantity with moisture is belong to exponential function. When the moisture increases from 0.05% to 12.04%, the limitation gas desorption amount decreases from 7.3383 mL/g to 2.7749 mL/g. Moreover, under the same adsorption pressure, the greater the moisture rate is, the smaller the gas desorption velocity of 1st minute (V1) is, and the change of gas desorption velocity of 1st minute with moisture is belong to logarithmic function. After water injection, Biot’s criterion of mass transmission increases, and the diffusion coefficient and Fourier’s criterion of mass transmission reduce, that is, the water injection have changed the diffusion kinetic parameters of coal mass.

Key words: water injection, limitation desorption quantity, gas desorption velocity, irradiation parameters

陈向军, 程远平, 何涛, 李鑫. 注水对煤的瓦斯扩散特性影响[J]. 采矿与安全工程学报, 2013, 30(3): 443-448.

CHEN Xiang-jun, CHENG Yuan-ping, HE Tao, LI Xin. Water injection impact on gas diffusion characteristic of coal mass[J]. Journal of Mining & Safety Engineering, 2013, 30(3): 443-448.

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