聚光太阳能-地热储能系统多参数耦合仿真的正交试验优化与经济性评估OA

[Objective]This study employs numerical simulation methods and orthogonal experimental design to conduct preliminary a priori research on a novel concentrated solar power-geothermal(GEO-CSP)long-duration energy storage system(LDES),aiming to comprehensively evaluate system parameter performance and economic feasibility.The new system utilizes concentrated solar power to heat a working fluid to high temperatures and injects the thermal energy into underground reservoirs via injection wells,thereby enhancing thermal storage capacity.[Methods]A multi-software coupled simulation approach was adopted.The SG-Tower software was used to calculate heliostat field heat collection performance via ray tracing.A COMSOL multiphysics model was used to simulate thermal-fluid coupled heat transfer in underground reservoirs,analyzing the effects of injection temperature,injection flow rate,and reservoir characteristics on thermal storage efficiency.A MATLAB/Simulink model was developed to simulate a two-stage flash power generation process.[Results]Based on the analysis of 27 sets of orthogonal experimental designs,the results indicated that under optimal operating conditions(e.g.,injection temperature of 350℃and injection flow rate of 100 m3/h),geothermal storage efficiency reached 93.6％and power generation efficiency reached 33.5％.Parameter sensitivity analysis revealed that injection temperature and injection flow rate were the primary controlling factors affecting system performance(with contribution rates of 78.3％and 14.0％,respectively).Under typical operating conditions,a reservoir thickness of approximately 100 meters balanced heat exchange efficiency and heat loss,achieving optimal overall system performance.Economic analysis indicated that in depleted oil and gas reservoir conversion scenarios,the investment payback period was reduced to less than 5 years,and the cumulative net profit of one well pair reached 31.536 7 million yuan over a 30-year life cycle.[Conclusion]This priori study provides a theoretical basis for parameter optimization and engineering applications of solar-geothermal coupled energy storage and power generation systems,offers important insights for promoting the development of long-duration renewable energy storage technologies.