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为了合理地开发利用浅层地温能并保护地下水环境,针对地下水源热泵工程应用中出现的热贯通现象和地下水开采引起的地层变形问题,同时将地下水渗流场、温度场和地层变形量均作为评价内容,建立地下热交换系统模拟数值模型,计算并预测地下水渗流场与温度场的运移趋势及对地下水环境的影响。结合工程场地地下水源热泵系统实例,通过模拟计算,制定采用一抽两灌、100%回灌,并将春秋季及冬季加热卫生用水温度提高1.972倍或多加热1.972倍卫生用水的运行方案,预测结果表明该方案能够有效地避免热贯通问题并控制地层变形量,使地下水源热泵系统能够长期高效运行。研究思路与方法对浅层地温能的合理开发和地下水环境的保护有积极意义。
In order to develop and utilize the shallow geothermal energy reasonably and protect the groundwater environment reasonably, in view of the hot through phenomenon and groundwater deformation caused by underground water source heat pump engineering application, the groundwater seepage field, temperature field and formation deformation are both evaluated Content, establish the numerical simulation model of underground heat exchange system, calculate and predict the migration trend of groundwater seepage and temperature field and the impact on groundwater environment. Combined with the example of underground water source heat pump system in project site, the operating plan of using 1 pumping and 2 filling and 100% recharge and increasing the temperature of sanitary water in spring, autumn and winter by 1.972 times or 1.972 times of heating is predicted by simulation. The results show that this scheme can effectively avoid the heat penetration problem and control the formation deformation, and make the ground-source heat pump system run efficiently for a long time. Research ideas and methods have a positive meaning for the rational development of shallow geothermal energy and the protection of groundwater environment.