Study On The Combined Cooling,Heating And Power System Of Gas Steam Combined Cycle Assisted By Solar Energy

Due to the advantages of clean and environmental protection,flexibility and independence,and high reliability of energy supply,distributed energy systems have become important development directions for the global power industry and energy industry.In order to achieve green development and sustainable development,China is also accelerating the development of distributed energy.This paper combines solar energy and natural gas,and proposes a solar-assisted combined gas-steam combined cycle cooling,heating,and power system,which provides new ideas for the development of distributed energy in China.Firstly,a solar-assisted combined heat and power system with gas-steam combined cycle was designed and built.The flue gas of the gas turbine is divided into two parts.The waste heat boiler uses the first part of the flue gas heat to generate high-temperature steam and combines the steam turbine to generate electricity.The solar collector heats part of the feed water in the waste heat boiler into higher temperature steam,which increases the temperature of the steam entering the steam turbine.;The flue gas type double-effect lithium bromide absorption heat pump uses the second part of the flue gas heat to provide district cooling and heating.Secondly,the thermodynamic analysis of the combined cold and heat and power system of the solar-assisted gas-steam combined cycle was performed.The design conditions and variable conditions were analyzed based on the system’s primary energy utilization rate,system efficiency,and solar net power generation rate.Down(variable solar radiation intensity,flue gas flow value of driving heat pump)thermodynamic performance of the system in summer and winter.Finally,the economic analysis of the solar-assisted gas-steam combined cycle cooling,heating and power supply system was performed,and the cost and income of the distributed project were calculated.The static and dynamic evaluation indicators were used to conduct a financial analysis of the project.The feasibility and risk of the project were evaluated.The sensitivity of economic indicators such as project net present value,financial internal rate of return,and project payback period to factors such as construction investment,natural gas prices,and sales prices was explored.