Research On Integrated Solar Combined Cycle Cogeneration System

With the massive consumption of fossil fuels,energy shortage and environmental pollution are becoming increasingly serious.Under such a background,accelerating the development of sustainable new energy technologies will become an important direction of China’s future energy development.As a widely distributed new energy,solar energy plays an important role in the field of new energy because of its limitless reserves and clean characteristics of development and utilization,which is an important energy basis for the realization of sustainable development of the electric power industry.However,due to the inherent defects of low density,intermittence and low energy flow density of solar energy itself,large-scale commercial application of solar thermal power generation has been hindered to a certain extent.Based on the Integrated Solar Combined Cycle(ISCC)system,the research is carried out from the aspects of system modeling,performance analysis and comprehensive evaluation,aiming to provide theoretical reference and ideas for the research and development of the ISCC system.The main research contents of this paper are as follows:First,based on a 9F gas-steam combined cycle,the static calculation model of the integrated solar combined cycle unit was established,and the performance of the solar-gas combined cycle system was simulated based on Ebsilon software.The accuracy of the established model was verified under the design condition and variable condition respectively.Secondly,the thermodynamic performance of ISCC unit is analyzed based on the established model.Based on the main thermodynamic principle,the operating characteristics of the unit under the pure condensation condition and heating condition were compared and studied,and the influences of solar energy input,gas turbine load rate,heating amount and other factors on the thermal efficiency and exergy efficiency of the ISCC unit were analyzed.This paper studies the variation of peak thermo-power regulation ability of the ISCC units under the condition of cogeneration of heat and power,and analyzes the variation of the complementary potential of the ISCC units and solar energy under different gas turbine loads.The results show that the configuration of solar energy and heat storage system in the ISCC system increases the thermoelectric feasible region of the unit,promotes the thermoelectric decoupling of the unit,and improves the thermoelectric peak regulation ability of the unit.The solar complementary potentials of the ISCC system are different under different gas turbine loads,and the solar complementary potentials first increase and then decrease with the increase of gas turbine loads.Finally,the technical economy,environmental protection and energy saving of the ISCC power station are analyzed.The economic and environmental indexes of the ISCC system,such as total investment,payback period,fuel saving rate and annual pollutant reduction,are evaluated.The results show that the ISCC system has good economic and environmental benefits.