贵州主要城市浅层地热能利用潜力评价

摘要

Guizhou,a province located in the southwest of China,possesses a total area of 1,414 km2 and ten major cities including Guiyang,Zunyi,Xingyi,Tongren,Liupanshui,Kaili,Duyun,Bijie,Anshun and Gui'an.Carbonate rocks and carbonate rocks intercalating clastic rocks widely extend cutover the province,which accounts for more than 90％ of the total urban planning area and an ecologically vulnerable environment in each city.As a clean,new and renewable green energy,shallow geothermal energy has many advances,such as wide distribution,large reserve and can be very helpful to solve many ecologically environmental problems of the cities in Guizhou.To evaluate the utilization potential of the shallow geothermal energy,in this paper,the geothermal environment conditions was comprehensively studied;data derived from field thermal response tests and heat physical property measurements of rock and soil bodies sampled in the major cities of Guizhou were analysed.The research results show that for the most rock samples in the major cities of Guizhou,the thermal conductivity coefficient rangs from 2.0 to 4.0 W · (m · K)-1;the thermal diffusion coefficient varies from 0.5 to 3.0 mm2 · s-1.The average value of the thermal conductivity of rock and soil is in the range of 2.5-3.5 W · (m · K)-1 and the thermal diffusion coefficient is 1.0-1.5 mm2 ·s-1.By applying volumetric calculation method,the total heat-capacity at the depth of 100 m below surface is 35.20 × 1013 kJ · ℃-1,while summer and winter heat transfer powers are 520.2 × 104 kW and 342.3 × 104 kW,respectively.In terms of resource utilization potential,the shallow geothermal energy can provide for refrigeration in summer time over an area of 7.43× 108 m2 and for heating in the winter over an area of 6.51× 108 m2.%作为清洁、新型、可再生的绿色能源,浅层地热能对缓解城市节能、减排等问题有很大的帮助.为评价贵州省贵阳市、遵义市、兴义市、铜仁市、六盘水市、凯里市、都匀市、毕节市、安顺市及贵安新区10个地级市和国家级经济开发区的浅层地热能利用潜力,文章根据浅层地热能赋存环境调查、现场热响应试验及岩土体热物性测试结果等综合分析,计算出贵州主要城市地表以下100 m深度内的浅层地热能总热容量为35.20×1013 kJ·℃-1,夏季换热功率为520.2×104kW,冬季换热功率为342.3×104 kW;并在此基础上,评价了贵州主要城市浅层地热能的资源潜力,夏季可制冷面积为7.43×108 m2,冬季可供暖面积为6.51×108 m2.