Research On The Construction Of Pumped-storage Power Station Using The Underground Space Of Abandoned Coal Mines In Bijie Area

In order to deal with a large number of abandoned mines left over or about to be produced,and to solve a series of problems caused by abandoned mines,underground space of abandoned coal mines can be used to construct underground pumped storage power stations to realize efficient and reasonable utilization of underground space,and at the same time enhance grid absorption.Capacity of renewable energy.Therefore,this article aims at the idea of transforming the underground space of abandoned mines into the pumped storage power station,and carries out the determination of the mechanical parameters of the roadway surrounding rock and the numerical experiment analysis,the feasibility analysis of the reconstruction of the pumped storage power station,the evaluation of influencing factors,and the technical and economic analysis.(1)Investigate the abandoned mines,query the relevant information of the mines,measure the mechanical parameters of the surrounding rock through the rock samples provided by the coal mining enterprises,and obtain the density,uniaxial compressive strength,and uniaxial tensile strength of the surrounding rock.Mechanical parameters such as shear strength can be used to determine the reliability of roadway space as a water storage reservoir.According to the measured parameters,the numerical experiment of the stability analysis of the water storage of the roadway is carried out.The verification of the experimental results shows that the roadway space has the stability and strength conditions of the water storage reservoir of the pumped-storage power station.(2)Through the establishment of an evaluation index system,the potential factors of the underground space of abandoned mines for the transformation of pumped storage power stations were analyzed,and the comprehensive weights and scoring grades of the influencing factors at various levels were determined.The research and analysis show that the upper and lower reservoir elevation difference is 400m-600 m,the upper and lower reservoir volume is larger,and the upper and lower reservoir elevation difference is 600m-800 m are important influencing factors in the evaluation index system;secondly,the upper and lower reservoir elevation difference is200m-400 m,supporting Conditions and medium volumes of upper and lower reservoirs are also important evaluation indicators for the construction of pumped storage power stations in the underground space transformation of abandoned mines.(3)Analyzed and studied the economic and technical feasibility after the transformation,and analyzed the head loss,total power consumption,total power generation,power generation efficiency and economic benefits of the power station through theory and calculation.As the reservoir excavation project is reduced,the cost of the conventional pumped storage power station is reduced by 33-35%.Through sensitivity analysis,it is found that PVPR and coal seam inclination have a significant impact on power generation efficiency and economic benefits.When the coal seam inclination increases from 5° to 25°,the power generation efficiency of the power station increases from 62.7% to 71.5%,and the economic benefits are also significant At the same time,the water flow speed in the water pipeline affects the size of the loss along the way.However,the analysis shows that it has a small impact on the power generation efficiency and economic benefits of the power station.This paper verifies the feasibility of constructing an underground pumped storage power station in the underground space of abandoned coal mines through physical mechanical experiments,numerical simulations and theoretical analysis of the stability of the surrounding rock of the roadway;and the influencing factors of the underground space of abandoned mines to transform the pumped storage power station Establish an evaluation index system,put forward a corresponding comprehensive index to indicate the grading level of the evaluation index,and complete the evaluation of the development potential of the roadway space;at the same time,carry out economic and technical analysis and evaluation for the construction project,and obtain different coal seam inclination and PVPR.Downstream has different effects on the power generation efficiency and economic benefits of the power station.This article broadens the scope of options for the secondary transformation and utilization of abandoned mines in my country,and subsequently carries out research on the precise development and utilization of abandoned coal mines in my country to improve the efficiency of development and utilization.At the same time,it also lays a good theoretical foundation for engineering practice,provides reference and reference for underground space development and utilization planning and strategic research,and also lays a certain foundation for the next step of analysis and research.