Gas Turbine Cogeneration Coordinative Optimization Model And Economical Analysis

The amount available of natural gas in our country is not abundant,the cost of gas turbine power generation is high all the time.In the face of request of the energy-economy-environment coordinated development,the high cost of production is an important factor on restricting the development of a combined cycle power plant.In the actual production process of domestic gas turbine power plant,gas-fired cogeneration feed-in tariff is low,gas power generation benefit is poor,and there even appears generation loss when the unit load is low.Therefore,how to explore and evaluate the unit's economic operation mode determines the profitability of the gas power generation enterprise.Gas-steam combined cycle system is more complex compared with the traditional steam cycle,its performance index,operation rules and the distribution characteristics of energy efficacy has more its own characteristics,the process of mechanism modeling is difficult,long cycle and high cost.At the same time,because the domestic main gas-steam combined circle equipment are introduced from abroad manufacturers,there's problem about technology security,we are lack of a series of performance parameters and structure parameters which are required in the calculation process,some solutions more simple and reasonable are required to establish the cycle coordinated output calculation model.Based on the further construction of combined cycle economic model and from the angle of equilibrium point in combined cycle economy.This paper taking a gas turbine combined cycle power plant in Zhejiang province which using the Mitsubishi 480 MW class M701F4 type gas-steam combined cycle unit as the research object,firstly establish directly the calculation model of heat recovery boiler which matches the gas turbine,then the relation model of combined cycle thermoelectric coordination output is built through the inverse fitting to the theoretical data from the manufacturer by mathematical method.Based on the further construction of combined cycle economic model and from the angle of equilibrium point in combined cycle economy,the paper analyses the production revenue status of combined cycle cogeneration enterprises when market conditions fluctuate within a certain range.Analyzing the multi-dimension economy of equilibrium point in combined cycle based on the calculation model,this research method and the calculation results provide a theoretical guidance to find the optimal combined cycle operation strategy,and pointed out the direction of improving the earnings for the combined cycle cogeneration enterprises.