Optimization Of Parameter Matching Of Gas-Steam Combined Cycle

In a gas-steam combined cycle unit,the gas turbine system and the steam system are interconnected,There is a certain coupling between parameters,The exhaust gas parameters of the gas turbine are used as the boundary parameters of the lower power station system,which has a great impact on the economics of the lower power station system,When the efficiency of the gas turbine is maximized,the combined cycle efficiency is not the maximum,Therefore,when studying the influence of key parameters on the heat rate of the unit,it is necessary to consider the coupling and transferability of the parameters,and study the influence of parameters on the efficiency from the overall perspective.This paper aims to improve gas-steam combined cycle efficiency,Study on physical model,parameter coupling and multi-parameter optimization of the gas-steam combined cycle to exploring the potential for combined cycle efficiency.First,the paper is based on thermodynamic theory and passed a rigorous mathematical derivation,Analysis of parameters affecting the efficiency of upper power station,lower power station and combined cycle power station,Based on this,the concept of coupling parameters for joint cycle efficiency is proposed.Secondly,taking a gas-steam combined cycle in Anshan as the research object,using EBSILON thermal calculation software to Establishing gas-steam combined cycle model,Based on the analysis of the characteristics of various parameters affecting the efficiency of the combined cycle,Study the relevant parameters of the gas-side and steam-side efficiency of the gas-steam combined cycle with different directions and summarize these parameters,Three coupling parameters of?、p_SoIandp_SoLare obtained.Finally,give the constraints,Aiming at maximizing the efficiency of combined cycle,using genetic optimization algorithm for multi-parameter optimization,The optimized values of three coupling parameters under load conditions of load100,load85,load70 and load55 are obtained,And compare the optimized value obtained in the load100 working condition with the original data,The study overcomes the shortcomings of the current thinking that failed to maximize gas-steam combined cycle efficiency.And provide a theoretical basis for gas turbine manufacturers to design gas turbines that are more conducive to gas-steam combined cycle efficiency improvement.