微波加热煤储层的共轭传热模型
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摘要
为研究微波和常规加热时煤储层内温度场的演化规律及储层瓦斯解吸量的变化规律,采用理论分析和数值模拟的试验方法,构建以岩石SEM图像为几何特征,瓦斯和煤基质块体为传热介质的共轭传热模型,对比常规加热和微波功率为1W、3W、5W和7W时温度场的演化过程.结果表明:微波加热时热量由煤储层内向外传递,传热速率是常规加热的1.5倍,且传热速率与微波功率呈对数增长关系;温度场的分布在微波电场传播方向上具有明显的阶段性和区域分布不均匀性,在距离微波端口处温度值最大,随距离增加温度值快速降低;在端口附近200μm的范围内温度的极差值是中部区域的14倍;瓦斯的吸附量随功率的增大基本呈线性递减关系.
This paper utilized the numerical simulating technique to study the conjugate heat transfer in microwave heated coal reservoir,and respectively achieved the warming effect of coal reservoir in the traditional heating mode and the microwave heating mode with microwave power of 1W,3W,5W and 7W respectively.The results show that microwave heating efficiency is high,and the velocity of heat transfer is 1.5 times faster than that of traditional heating.The relationship between microwave power and velocity of heat transfer is logarithmic.The microwave heating temperature distribution is chiefly characterized by regional and uneven.The highest temperature is nearby microwave port,and the temperature decreased rapidly with the increase of the distance;the value of range(R) nearby port(0-200μm) is 14 times bigger than middle region;Adsorbed gas with the microwave power is a basically linear descend.
This paper utilized the numerical simulating technique to study the conjugate heat transfer in microwave heated coal reservoir,and respectively achieved the warming effect of coal reservoir in the traditional heating mode and the microwave heating mode with microwave power of 1W,3W,5W and 7W respectively.The results show that microwave heating efficiency is high,and the velocity of heat transfer is 1.5 times faster than that of traditional heating.The relationship between microwave power and velocity of heat transfer is logarithmic.The microwave heating temperature distribution is chiefly characterized by regional and uneven.The highest temperature is nearby microwave port,and the temperature decreased rapidly with the increase of the distance;the value of range(R) nearby port(0-200μm) is 14 times bigger than middle region;Adsorbed gas with the microwave power is a basically linear descend.
引文
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[16]杨新乐.低渗透煤层煤层气注热增产机理的研究[D].阜新:辽宁技术工程大学研究生院,2009.Yang Xinle.Study on mechanism of injection heat increasing production in coal-bed gas of low permeability coal seam[D].Fuxin:Graduate School of Liaoning Technical University,2009.
[2]刘纪坤,何学秋,王翠霞.红外技术应用煤体瓦斯解吸过程温度测量[J].辽宁工程技术大学学报:自然科学版,2013,32(9):1 161-1 165.Liu Jikun,He Xueqiu,Wang Cuixia.Measurement of temperature variation in coal gas desorption based on infraed imaging technology[J].Journal of Liaoning Technical University:Natural Science,2013,32(9):1 161-1 165.
[3]张凤婕,吴宇,茅献彪,等.煤层气注热开采的热-流-固耦合作用分析[J].采矿与安全工程学报,2012(4):505-510.Zhang Fengjie,Wu Yu,Mao Xianbiao,et al.Coupled thermalhydrological-mechanical analysis of exploiting coal methane by heat injection[J].Journal of Mining&Safety Engineering,2012(4):505-510.
[4]鞠彩霞,李凤刚,宗志敏,等.微波辐射条件下两种煤的萃取规律[J].辽宁工程技术大学学报:自然科学版,2013(5):615-618.Ju Caixia,Li Fenggang,Zong Zhimin,et al.Two kinds of coal extraction rules under microwave radiation[J].Journal of Liaoning Technical University:Natural Science,2013(5):615-618.
[5]李皋,孟英峰,董兆雄,等.砂岩储集层微波加热产生微裂缝的机理及意义[J].石油勘探与开发,2007(1):93-97.Li Gao,Meng Yingfeng,Dong Zhaoxiong,et al.Mechanisms and significance of microfractures generated by microwave heating in sandstone reservoirs[J].Petroleum Exploration and Development,2007(1):93-97.
[6]周俊虎,李艳昌,程军,等.神华煤微波改性提高成浆性能的研究[J].煤炭学报,2007(6):617-621.Zhou Junhu,Li Yanchang,Cheng Jun,et al.Research of improving slurrying property of Shenhua coal by microwave pre-heating[J].Journal of China Coal Society,2007(6):617-621.
[7]韩磊.热流固耦合模型的瓦斯抽采模拟[J].辽宁工程技术大学学报:自然科学版,2013,32(12):1 605-1 608.Han Lei.Numerical simulation of gas drainage based on fluid-solid-heat coupling model[J].Journal of Liaoning Technical University:Natural Science,2013,32(12):1 605-1 608.
[8]李涛,陈海龙,杨广志,等.橡胶微波加热的数值模拟研究[J].工程热物理学报,2012(9):1 559-1 562.Li Tao,Chen Hailong,Yang Guangzhi,et al.He study on the numerical simulation of rubber microwave heating[J].Journal of Engineering Thermophysics,2012(9):1 559-1 562.
[9]梁冰,孙可明.低渗透煤层气开采理论及其应用[M].北京:科学出版社,2006.Liang Bing,Sun Keming.The Theory And Application Of The Extracting Methane In Low-Permeability Coal Bed[M].Beijing:Science Press,2006.
[10]杨新乐,任常在,张永利,等.低渗透煤层气注热开采热-流-固耦合数学模型及数值模拟[J].煤炭学报,2013(6):1 044-1 049.Yang Xinle,Ren Changzai,Zhang Yongli,et al.Numerical simulation of the coupled thermal-fluid-solid mathematical models during extracting methane in low-permeability coal bed by heat injection[J].Journal of China Coal Society,2013(6):1 044-1 049.
[11]赵希强,王敏,张建,等.秸秆料包微波加热过程的温度分布的数值模拟[J].农业工程学报,2011(8):308-312.Zhao Xiqiang,Wan Min,Zhang Jian,et al.Temperature distribution simulation of microwave heating process of straw bale[J].Transactions of the CSAE,2011(8):308-312.
[12]Abdussamie N.Navier-Stokes Solutions for Flow and Transport in Realistic Porous Media:Proceedings of the COMSOL Conference,2010[C].Boston:2010.
[13]Sirivithayapakorn S,Keller A.Transport of colloids in saturated porous media:A pore‐scale observation of the size exclusion effect and colloid acceleration[J].Water Resources Research,2003,39(4).
[14]Zhang H,Datta A K,Taub I A,et al.Electromagnetics,heat transfer,and thermokinetics in microwave sterilization[J].AICh E journal,2001,47(9):1 957-1 968.
[15]徐龙君,鲜学福,李晓红,等.交变电场下白皎煤介电常数的实验研究[J].重庆大学学报:自然科学版,1998(3):8-12.Xu Longjun,Xian Xuefu,Li Xiaohong,et al.An experimental study on the permittivity of bai jiao coal in alternating electric field[J].Journal of Chongqing University:Natural Science Edition,1998(3):8-12.
[16]杨新乐.低渗透煤层煤层气注热增产机理的研究[D].阜新:辽宁技术工程大学研究生院,2009.Yang Xinle.Study on mechanism of injection heat increasing production in coal-bed gas of low permeability coal seam[D].Fuxin:Graduate School of Liaoning Technical University,2009.