Study On Characteristics And Development Suitability Of Shallow Geothermal Energy In Danyang

Shallow geothermal energy refers to the development and utilization of geothermal energy resources,which contain shallow rock and soil ground source heat pump(ground source heat pump),ground water source heat pump(ground source heat pump)and surface water(surface water source heat pump)below ground surface,which has huge resource potential and broad prospects for exploitation and utilization.And it has a great potential for development and utilization.New urbanization in China also plays a very important role.However,the development and utilization of shallow geothermal energy must be adapted to local conditions In full consideration and utilization of local resource endowment conditions,it is necessary to organize the investigation and evaluation of the suitability of shallow geothermal energy resources first,and to do a good job of suitable zoning and regional planning.The shallow geothermal resources in the central city of Danyang have unique endowments,and have great potential in the construction of new towns,efficient facilities agriculture and tourism vacation development.This project is based on "Danyang urban geological environment comprehensive survey sub project(Jiangsu Zhenjiang Danyang city small town water ring geological survey)",the main research contents include:1.Analysis of influence factors of shallow geothermal field in the research area.Using the geothermal monitoring system to identify the occurrence characteristics of shallow geothermal fields in the study area,it is found that the temperature of the thermostatic zone is positively correlated with the local annual average temperature,and the general rule of temperature belt depth in the temperate zone from low to high is:subtropical<warm temperate zone.2.Analysis of thermal property characteristics of rock and soil in the study area.The physical and thermal parameters of the rock soil are determined by drilling,sampling and indoor thermal property test.At the scene of the anatomy of the thermal response test of the test process,through the numerical simulation and field test of contrast,analysis of different flow velocity,single and double u-shape effect on the performance of heat transfer in geotechnical engineering,found U tube heat transfer unit well depth increases first and then decreases with the increase of tube flow velocity,the optimal flow rate within 0.8 1 m/s.In the double U type,the heat exchange efficiency is about 36%to 40%higher than that of single U.Compared with the indoor and outdoor test results,it was found that the thermal property parameters obtained by in-situ thermal response test were larger than that of indoor thermal properties,which was about 20%to 25%higher.3.Analysis of suitability evaluation of shallow geothermal energy.The main control factors that influence the development and utilization of shallow geothermal energy are analyzed,and the zoning indicators are determined,and the appropriate zoning of underground heat transfer and surface water heat transfer is carried out respectively.Based on the evaluation process,a shallow geothermal evaluation system based on GIS is designed.4.Analysis of the impact of shallow geothermal energy on geological environment.The influence of ground source heat pump system on geological environment is summarized.For a certain period of surface water source heat pump system in the study area cooling water discharged into receiving waters process using Fluent software to carry on the numerical simulation,concluded that receiving waters the influence of water temperature of drainage water area accounted for 2.12%,maximum temperature 2.6?,near the surface water source heat pump water will not cause environmental harm.