Study On A New Solar Thermal Energy Complementary Combined Cycle Power Generation System

With the worsening of energy and environmental problems around the world,all countries in the world have conducted in-depth cooperation and research on reducing pollutant emissions and using new energy sources.Renewable sources play a very important role in the future energy structure.Solar energy is the key to solve the energy and environmental problems in today's world due to its advantages of rich reserves,clean and great potential for development.However,solar-only thermal power generation system have problems of high cost,unstable operation and low solar thermal efficiency.In this paper,the integrated characteristics and operation modes of integrated solar combined cycle system(ISCC)are deeply studied.The thermodynamic performance under different integration modes is analyzed.The general law of solar energy integration is explored.On the basis of this,a new integration method is put forward to achieve the goal of efficient and clean energy utilization.The details are as follows:(1)Study and optimization of integrated characteristics of solar thermal complementary combined cycle power generation system.Based on a gas steam combined cycle system with the three pressure HRSG with reheat,the thermodynamic performance and maximum power generation of integrating solar into different heating surfaces of HRSG is studied.The second law of thermodynamics are used to analyze the stimulation results,and guiding principle of integrating solar energy in ISCC system is summarized.On this basis,the parameters of HRSG are designed and optimized,which effectively improves the overall performance of the integrated system and the solar power generation.(2)Study on a new solar thermal energy complementary power generation system based on gas-steam combined cycle.On the basis of the general law of solar energy integration,a new system is proposed.The solar energy is integrated into the chiller for cooling the compressor inlet air of gas turbine and the heat recovery steam generator(HRSG)for increasing the power output simultaneously.The operating performances of typical day and full year are analyzed in this paper.And the proposed new system not only greatly increases the annual utilization of solar energy,but also has the significant thermodynamic advantages.