井陉县奥陶系灰岩浅层地温能开发利用潜力研究

Research on potential of development and utilization for shallow geothermal energy in Ordovician limestone of Jingxing County

摘要:

为研究井陉县奥陶系灰岩所蕴藏的浅层地温能，在井陉县的河谷内实施热响应试验钻孔一眼，测试了其岩土体物理力学、热物性参数及地温场特征，发现该地区10 m以深平均地温达到了16.77 ℃，夏、冬季工况测试条件下单位延米换热量分别为68.38、65.78 W/m。通过选取地下水位埋深、地下水流速等8项指标对井陉县进行了地埋管地源热泵适宜性评价，将评价区划分为较适宜区、适宜区和不适宜区，其中较适宜区面积为244.12 km²，占总面积的16.82%。在此基础上对较适宜区进行了资源潜力评价，计算了其资源潜力及节能减排能力。为了更好的验证井陉县奥陶系灰岩所蕴藏的浅层地温能具有开发利用价值，安装了相关配套应用工程及监测设备，监测了在不同工况测试条件下的耗能量，通过与普通家用空调耗能量进行对比分析，使用地埋管地源热泵年运行成本约为使用空调成本的55%，具备开发利用价值。

Abstract:

In order to study the shallow geothermal energy contained in the Ordovician limestone of Jingxing County， a thermal response test well in the valley is drilled， where the physical mechanics， thermal properties and geothermal field characteristics of the rock and soil mass are tested. As a result， the average geothermal temperature below 10m reached 16.77℃， and the heat transfer per unit length in summer and winter under the test conditions were 68.38W/m and 65.78W/m， respectively. Eight indicators such as the burial depth of the groundwater level and the velocity of the groundwater were selected to evaluate the suitability of ground source heat pump with buried pipe in Jingxing County， and the evaluation area was divided into more suitable area， suitable area and unsuitable area. Among them， the more suitable area is 244.12km²， accounting for 16.82% of the total area. On this basis， the resource potential evaluation was carried out on the more suitable area， and the resource potential and energy saving and emission reduction capacity were calculated. In order to better verify the development and utilization value of the shallow geothermal energy contained in the Ordovician limestone of Jingxing County， the relevant supporting application engineering and monitoring equipment were installed to monitor the energy consumption under different test conditions. Compared with the energy consumption of the ordinary household air conditioners， the annual operating cost of ground-source heat pump with buried pipe is about 55% of the air conditioning， which possess the development and utilization value.