| Shallow geothermal energy resources is a kind of sustainable exploitation and utilization of clean energy,is more and more attention in recent years,can replace part of conventional energy sources,has remarkable effect of energy conservation and emissions reduction,along with the gradually perfecting for the development of technology,combined with the national policy vigorously promote,shallow geothermal energy exploitation and utilization in our country has entered a phase of steady development.Reasonable planning,exploitation and utilization is an important link for the sustainable development of shallow geothermal energy resources.In this paper,based on the geological survey project"dalian city the main urban geological survey,shallow ground temperature can survey evaluation",in dalian city as the study area,on the basis of predecessors'information collection,combined with the shallow geothermal geological conditions in the study area,constructs the evaluation index system of shallow geothermal energy development and utilization suitability zoning,the main index of the fuzzy hierarchy comprehensive correction method,monte carlo method,particle swarm optimization(European space method,the fuzzy comprehensive evaluation method,the equivalent method of the underground water,carried out the shallow geothermal energy exploitation and utilization of suitability zoning,resources evaluation,prediction of shallow geothermal energy resource potential,The sustainable development and utilization mode of shallow geothermal energy is studied,and the sustainable development countermeasures are put forward.Achievements in the following aspects:1.The suitable area of ground source heat pump system is distributed in Donggang Business District and Dalian Shipbuilding New Factory.The area is rich in water and the pumping and irrigation conditions are moderate,with an area of 32.87km2,accounting for4.45%of the total area.The suitable areas are distributed in Yingchengzi,Gezhenbao and Dalianwan streets of Ganjingzi District.The water content is strong to medium,the aquifer thickness is 20-30m,and the area is 247.21km2,accounting for 33.47%of the total area.The ground source heat pump is distributed in Gezhen Castle,Nanguanling,Dalian Bay,Hongqi,Lingshui Street in Ganjingzi District.The stratigraphiclithology in the area is interbedded with limestone and quartz sandstone and slate.The comprehensive thermal conductivity of the formation is high,and the heat transfer power of the single hole is large.2.The evaluation results of shallow geothermal energy reserves show that the minimum and maximum of shallow geothermal energy stored at 200m in the study area are0.536×1014k J,3.182×1014k J,and the average value is 1.859×1014k J.When the stored heat is between 0.906×1014?2.697×1014k J,the certainty is 90%,and the most possible value of shallow geothermal energy reserves is 1.986×1014k J.The total area available for heating in winter is 2.20×108m2,and the total area available for cooling in summer is 4.21×108m2.The areas with high shallow geothermal energy resource potential are distributed in the north of Xinzhaizi?Zhoushuizi Street,the northwest of Hongqi-Longwangtang Street and Lingshui Street of Hi-tech Park,and the south of Zhongshan District,covering 487.69km2,accounting for 66.03%of the total area.The medium area of resource potential is distributed in Yingchengzi Street in the northwest of Ganjingzi District and the northeast of Zhongshan District,with an area of23.10km2,accounting for 3.13%of the total area.3.The sustainable development and utilization of shallow geothermal energy resources is better distributed in the north,which is suitable for the development and utilization of shallow geothermal energy in the form of ground source heat pump with buried pipe.The medium area is distributed in the south,the stratum is quartz sandstone,located in Dalian Jinlongsi National Forest Park and the western suburbs of the National Forest Park;Poor distribution in Xigang District,Zhongshan District and other places,the formation lithology is mainly slate and quartz sandstone,the comprehensive thermal conductivity is low,single hole heat transfer power is small,not suitable for ground source heat pump engineering construction.The sustainable development and utilization degree of shallow geothermal energy resources in the study area is medium.The geological exploration level and ecological environment quality are good,but the comprehensive utilization level of shallow geothermal energy is still low.The research area is generally suitable for the development and utilization of shallow geothermal energy by ground source heat pump system with buried pipes.Key areas for sustainable development and utilization include Dalian Jinzhou Bay International Airport,Lingshui Bay EOD International Business District,Youjia Village Ecological Science and Technology City,and Zhongge Village Business District. |
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