Research Of The Reason Of Pore Water Quality Variations In Loose-rocks Induced By Groundwater Source Heat Pump In Lixin County

As a new type of clean, environmental and renewable energy, shallow geothermal energy has broad prospects of develop and utilization. Groundwater Source Heat Pump System is an important way to develop and utilize shallow geothermal energy. It is a kind of heat pump with high efficiency and low cost in ground source heat pump system. Groundwater Source Heat Pump System is generally adopted in the cycle process of "pumping-energy exchange-recharging". In order to reduce the influence of the project operation on the quantity and quality of groundwater resources, the thermal energy of the underground water is reasonably utilized.Groundwater temperature field and chemical field change during the operation of the "pumping and recharging" system of Groundwater Source Heat Pump System. Under the influence of mixing, oxidation, temperature, dissolution and precipitation, CO2 partial pressure and microorganism. Make the water quality of underground water change; In addition, the change of the Hydrodynamic field in the process of "pumping and recharging" also causes the change of the groundwater Seepage field, which changes the Groundwater flow field and accelerates the exchange of groundwater in different aquifers. The above makes the operation of Groundwater Source Heat Pump System will cause some impact on the water quality of aquifer.This paper is based on the Lixin County People’s hospital Groundwater Source Heat Pump project, combined with the regional Hydraulic property, water content, water resources and groundwater burial conditions;and Water quality testing data of Groundwater source heat pump, to analysis and evaluation of the water chemistry type, ionic correlation and water quality of loose pore water in the study area. At the same time according to the relevant information and the actual situation of the region, with the aid of Modflow software, establish the corresponding numerical simulation model, dynamic prediction and evaluation of groundwater flow field. To analyze the influence of the groundwater flow field and the change of the flow field on the groundwater quality in Groundwater Source Heat Pump System operation, so as to make timely warning and put forward some suggestions to avoid the adverse effect of the Groundwater Source Heat Pump System operation on the groundwater.Research results show that: The operation of Groundwater Source Heat Pump System has a certain impact on the groundwater quality, but with the operation of Groundwater Source Heat Pump System, the water quality of groundwater has not developed to the direction of deterioration. In particular, the content of fluorine in groundwater in Huaibei plain is generally high. The operation of Groundwater Source Heat Pump System reduced the content of fluorine.