黄土塬区中深层无干扰地热能技术应用研究

Application Research on Medium-deep Non-interfering Geothermal Energy Technology in Loess Tableland

本文通过黄土塬区某学校中深层无干扰地热能供暖项目的测试数据,分析了该技术在黄土塬地质环境的应用特点及前景。项目供暖面积28 513 m^(2),配置2孔2 520 m深的同轴套管换热井,实测孔底温度76.1℃。其中黄土层0~210 m地温梯度为5.22℃/hm,说明黄土层可能具有较好的控热作用。实测单井换热功率为271.62 kW,与计算结果基本一致。耗电成本为2.28元/m^(2)·月,全系统COP为4.45,每个采暖期可减少CO_(2)排放785.22 t。中深层无干扰地热能技术在黄土塬区建筑碳减排中具有较好的应用前景。

Based on the test data of a school heating project in Loess Tableland District which use Medium-Deep Non-Interfering Geothermal Energy(MDNGE),this paper analyses the application characteristics and prospect of MDNGE technology in geological environment of Loess Tableland.The school covers an area of 28513 m^(2) equipped with 2 coaxial borehole heat exchanger(CBHE)wells.The measured hole temperature is 76.1℃in the depth of 2520 m.The temperature gradient in loess layer is 5.22℃/hm from 0 to 210 m.Which indicates that the loess layer may have good heat control function.The measured heat transfer power of single well is 271.62 kW,which is basically consistent with the calculated results.The power consumption cost of the heating system is 2.28￥/m^(2)·M.The COP is 4.45.The CO_(2) emission reduces by 785.22 t in each heating period.The technology has a good application prospect in carbon emission reduction of buildings in Loess Tableland.