Economic Study Of QW Gas-Steam Combined Cycle Thermal Power Plant

China's energy structure with more coal and less gas,coal-fired power plants are the main power production in China.In recent years,with the severe environmental situation in China,the state has made great efforts to develop gas-fired power generation projects.Gas-fired power generation projects have low emissions that are difficult to compare with traditional coal-fired power plants,which is conducive to the improvement of the ecological environment and the promotion of energy saving and emission reduction plans.Therefore,it is necessary to analyze the economy of gas-fired power plants and improve the level of operation economy under the economic background of our country.Higher economy will improve the profitability of gas-fired power plants,thus promoting the rapid development of the gas-fired power plant industry.Based on the operation data of QW gas power plant in Beijing,this paper analyses its operation status and concludes that the current situation of the power plant is good,but there are still many unfavorable factors in production,economy and policy,which will create hidden dangers for the operation of the gas power plant.With the help of the relevant theories of economic analysis,the whole life cycle cost and composition of gas-fired power plants are comprehensively analyzed by using life cycle cost theory.Based on the cost of gas-fired power plants analyzed,a model is established according to the leveling power generation cost theory,and the total cost of gas-fired power plants is calculated.The cost and output of QW gas-fired power plant are calculated and substituted into the calculation formula of the leveled generation cost model.Finally,the leveled generation cost of QW gas-fired power plant is 0.63 yuan/kWh.Then,the sensitivity analysis theory is used to analyze the different factors affecting the leveled generation cost by single factor analysis method.The change of positive and negative proportion shows that the price of natural gas is the main external sensitive factor of the cost of gas-fired power plants,and the gas consumption of units is the main internal sensitive factor.In order to further improve the economy of QW gas power plant,this paper puts forward suggestions from five aspects:perfecting the pricing mechanism of electricity price on the grid,optimizing the dispatching mode of gas power plant power grid,mastering the core technology of gas turbine,optimizing the operation mode of units and improving the external benefits of power plant.