微波注热与传导注热对煤层瓦斯运移的激励效应对比分析  

Comparative Analysis of Excitation Effects of Microwave Heat Injection and Conduction Heat Injection on Coal Seam Gas Migration

作　　者：王志军[1,2,3] 陈庚 龚静 梅向乾 WANG Zhijun;CHEN Geng;GONG Jing;MEI Xiangqian(State Key Laboratory Cultivation Base for Gas Geology and Gas Control,Henan Polytechnic University,Jiaozuo 454003,China;School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China;Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization,Jiaozuo 454003,China)

机构地区：[1]河南理工大学河南省瓦斯地质与瓦斯治理重点实验室—省部共建国家重点实验室培育基地,河南焦作454003 [2]河南理工大学安全科学与工程学院,河南焦作454003 [3]煤炭安全生产与清洁高效利用省部共建协同创新中心,河南焦作454003

出　　处：《煤炭技术》2024年第9期200-205,共6页Coal Technology

基　　金：河南省科技攻关项目(212102310401,202102310546);河南省自然科学基金项目(212300410346)。

摘　　要：为探究微波注热和传导注热对煤层瓦斯运移的影响,建立了热-流-固耦合模型,通过COMSOL Multiphysics数值软件分别模拟传统传导注热和2450 MHz微波注热对煤层瓦斯运移的激励效应,以相同注热功率为基础,对比分析了2种注热方式下煤层温度、渗透率比例、瓦斯含量、瓦斯抽采率、热损失的演化规律。结果表明:2种不同注热方式对瓦斯运移的激励效应相似,随着抽采时间的延长,煤层温度逐渐升高,渗透率比例先减小后增大,煤层总瓦斯含量逐渐减小,瓦斯抽采率先增大后减小;相对于传导注热,微波注热效果更佳,煤层渗透率整体较大,吸附瓦斯含量较低,残余瓦斯含量整体较高,瓦斯抽采量较高,瓦斯抽采率较大、热损失较小。微波注热比传导注热对煤层具有更好的激励效应,能更好地加速煤层瓦斯吸附解吸,更有利于煤层瓦斯的抽采,且传热效率高,热损失小,更节能。In order to explore and compare the effects of microwave heat injection and conduction heat injection on the gas desorption rate and comprehensive effect of coal seam,a heat-fluid-solid coupling model was established,and the excitation effect on coal seam gas migration under a single heat source and 2450 MHz microwave frequency was simulated by COMSOL Multiphysics numerical software.The same heat injection power is set and the evolution law of coal bed temperature,permeability ratio,gas content,gas extraction rate and heat loss under different heat injection methods is compared and analyzed.The results show that the two different heat injection methods have similar stimulation effects on gas migration.With the prolongation of extraction time,the temperature of coal seam increases gradually,the permeability ratio decreases first and then increases,the total gas content of coal seam decreases gradually,and the gas extraction increases first and then decreases.Compared with conduction heat injection,microwave heat injection effect is better,the overall permeability of coal seam is larger,the adsorbed gas content is lower,the free gas content is higher,the gas extraction amount is higher,the gas extraction rate is larger,and the heat loss is small.Therefore,microwave heat injection has a better incentive effect on coal seam than conductive heat injection,can better accelerate the adsorption and desorption of coal seam gas,and is more conducive to coal seam gas extraction.

关 键 词：微波注热 传导注热 瓦斯运移 热-流-固耦合 数值模拟 

分 类 号：TD712[矿业工程—矿井通风与安全]