Study On The Integrated Tower Solar Energy Gas-Steam Combined Cycle System

In recent years,along with the continual demand for energy from the industrialization process and the energy supply crisis,the consumption of a large amount of fossil energy has caused the worsening of the earth’s ecological environment.From the perspective of the world energy utilization structure,energetically developing renewable energy such as solar energy and wind energy has become an important means to balance the current world energy utilization structure,and solar energy has become the most promising development with its near unlimited storage and clean and pollution-free characteristics The importance of energy is increasing day by day.However,due to the current thermal storage technology is immature,low unit parameters,low efficiency,high investment costs and other factors,independent solar thermal power generation technology is difficult in large-scale commercial operation to form a greater competitive advantage.This paper,based on the PG9351FA gas turbine,commercial software Aspen plus,Ebsilon Professional and Tmsys studio are used to simulate the integrated solar combined cycle(ISCC)system.The integrated characteristics of the new power generation system integrated with tower solar in a conventional gas-steam combined cycle system,the characteristics of the entire operating conditions and the contribution of solar energy are further studied.In order to reduce the adverse effect of solar energy volatility on the safe operation of the system,a new integrated approach is proposed and the full-summer simulations are conducted to analyze the thermodynamic performance of the new system.On the basis of this system,the practical problem of solar power is studied in depth.Based on the theory of exergy,a contribution model of solar energy contribution is proposed.Considering the difference in the work ability of different grade solar energy in the bottom cycle and the influence of the integrated position on the change of flue gas heat exchange efficiency in the bottom cycle.According to the end of the cycle pressure,temperature and steam work flow regional division,the solar power,solar-electrical conversion efficiency,contribution and other performance indicators were calculated.In this paper,sensitivity analysis is made on the proposed contribution model of solar energy,and the results of simulation analysis of seven different integrated schemes are summarized based on the solar energy input variables.The thermodynamic characteristics of the integrated tower solar combined cycle system in the bottom cycle Complementary law for the solar thermal system integration to guide the study.