浅层地温能开发与地下水环境影响模拟预测

SIMULATION OF SHALLOW GEOTHERMAL ENERGY DEVELOPMENT AND GROUNDWATER ENVIRONMENTAL INFLUENCE

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。

To reasonably develop transfixion phenomenon and strata shallow geothermal energy and protect the groundwater environment, aiming at heat deformation caused by groundwater exploitation in the application of groundwater heat pump system, the underground heat exchanger system was simulated and calculated, and the numerical model of underground heat exchange system was established, taking the groundwater seepage field, temperature field and stratum deformation together as the content of evaluation. With the example of the groundwater heat pump project, based on the simulation and calculation, the running program is determined, that is one pumping well works with two recharge wells, the circulation ratio is 100%, and heat the sanitary water in spring, autumn and winter to increase 1.972 times hot or more 1.972 times quantity. The prediction results shown that the program can effectively prevent the heat transfixion phenomenon and control the strata deformation, making ideas and methods of the research have a positive the groundwater heat pump system is efficient and durable. The significance to rational utilization of shallow protecting the environment.