Study On The Occurrence Conditions And Utilization Of Shallow Geothermal Energy Resources In Binhai New Area

Shallow geothermal energy is a new type of environmentally renewable energy of broad prospect used,which is trapped below the surface in a certain depth range (usually200m) of rock and soil, groundwater, has the value of development and utilization.Based on the study of geological, drilling data and geophysical logging, test data of thermophysical parameters in rock and soil, combined with the comprehensive exploration technology and second development of data, the occurrence of shallow geothermal energy in Tianjin Binhai area is identified: Quaternary lithology is mainly composed of clay, silty clay, powder sand, fine sand and coarse sand; stratum structure is dominated by interbed strata of clay, silty clay, silt and sand, silt and sand. The thermal conductivity of rock and soil mass ratio:1.28～1.55W/(m·℃), specific heat capacity from2050.46to2131.58W/(m·℃), Quaternary Groundwater inflow is500～2000(m3/d), water conduction coefficient50～300(m2/d), recharge volume of groundwater is30～80m3/h, the recharge quantity water of single well is30～50%of outlet water, the recharge water is mostly below50m3/h, discharging heat of strata is32.32～78.94(w/m), the absorpting heat is17.73～42.43(w/m). considering the requirement of shallow geothermal energy resources needs in Tianjin city, based on analyzing the occurrence of shallow geothermal energy resources in this area, utiliziing patterns (ground source heat pump pipe ground source heat pump, ground) of shallow geothermal energy, firstly calculates partition the weights of evaluation factor using by AHP and non structural fuzzy weighting method, then determine the final weight with the comprehensive index, finally evaluate the suitability partition by two grade evaluation system combination with the spatial analysis function of GIS, obtain two uses partition scope and area mode. Groundwater source heat pump system:majority of the region are unsuitable area with the suitable area of Ⅱ aquifer is149km2,Ⅲ aquifer suitable area is91km2; IV group suitable area is10km2. Ground source heat pump system:area of suitable region (I grade district) is86km2. area of Suitable region (grade II District) is1279km2. area of the general suitable region (grade III District) is905km2. Shallow geothermal reserves and heat power of suitable areas are calculated, containing economic and social value. Each year, the developed resources of all the shallow geothermal energy can replace9156800t standard coal, and can replace6867600t standard coal with deduction of consumption due to the exploitation of shallow geothermal energy, reducing18150400t emission of the ash,nitrogen oxides,sulfur dioxide, carbon dioxide into the atmosphere and the environmental administration fee of20017039100yuan.put forward suitable for shallow geothermal energy development and utilization direction of and Countermeasures for Tianjin Binhai New Area, provide scientific basis for achievement of strategic objectives of energy-saving emission reduction and the reasonable development and utilization of shallow geothermal resources.