江苏高邮地埋管热响应试验及浅层地热能资源评价

Thermal response test of buried tubes and evaluation of shallow geothermal energy resources in Gaoyou,Jiangsu Province

为研究江苏高邮浅层地热能资源储量,选取2个典型区块开展现场热响应试验,以线热源理论为建模基础,结合地埋管进出水温度试验数据,建立了典型区块内地埋管热传导模型,采用体积法对研究区浅层地热能资源作出定量评价。数据分析表明:在G001孔处,初始地层温度为17.69℃,导热系数为1.389 W/(m·K),钻孔内传热热阻为0.111 K/W,热扩散系数为0.921×10^(-6) m^(2)/s,热容量为1.508×10^(6) J/K,单位延米换热量为104.98 W/m;在G002孔处,初始地层温度为18.58℃,导热系数为2.340 W/(m·K),钻孔内传热热阻为0.110 K/W,热扩散系数为0.229×10^(-6) m^(2)/s,热容量为10.200×10^(6) J/K,单位延米换热量为163.34 W/m。综上试验参数计算结果可知,区内每年可开发浅层地热能储量至少为6.47×10^(13) kJ。试验设计合理,所得参数真实可靠,可为高邮浅层地埋管地源热泵工程后续设计工作提供基础数据与技术支撑。

In order to develop and utilize shallow geothermal energy resources in Gaoyou,Jiangsu,two typical blocks were selected for in-situ thermal response tests in the study area.Based on linear heat source theory,the inlet and outlet water temperature response curves of the buried heat tubes were obtained to establish a typical heat conduction model of the buried tubes.The quantitative evaluation of shallow geothermal energy resources in the study area was made by volume method.The results show that the initial formation temperature of the soil is 17.69℃,thermal conductivity coefficient is 1.389 W/(m·K),the borehole heat transfer resistance is 0.111 K/W,the thermal diffusion coefficient is 0.921×10^(-6) m^(2)/s,the thermal capacity and heat exchange capacity per unit linear meter are 1.508×10^(6) J/K and 104.98 W/m in G001.In G002,the initial formation temperature of the soil is 18.58℃,thermal conductivity coefficient is 2.340 W/(m·K),the borehole heat transfer resistance is 0.110 K/W,the thermal diffusion coefficient is 0.229×10^(-6) m^(2)/s,the thermal capacity and heat exchange capacity per unit linear meter are 10.200×10^(6) J/K and 163.34 W/m.Therefore,shallow geothermal energy that can be developed and used in the study area is at least 6.47×10^(13) kJ per year.The test data is accurate and reliable,which can provide basic data and technical support for the engineering design of shallow buried tubes ground-source heat pump in Gaoyou City.