Modeling And Simulation Of Gas Steam Combined Cycle Based On A Certain Turbine

As the improvement of individual equipment efficiency is increasingly difficult, the energy must be step utilized in order to make full use of heat to improve the efficiency of the theoretical system. In this context, it appears a variety of combined-cycle scheme, such as HAT, IGCC, PFBC, this thesis based on a certain gas turbine, designed a scheme (CCGT), established the model and researched the simulation of this model.The main points of this thesis are as follows:Taking into account the influence of gas drainage on system performance, this thesis uses high,low pressure ratio compressors instead of the original, the compressor characteristic map is obtained through the "backbone line method" and the gas turbine simulation model is established using the modular modeling method.Characteristics of water vapor parameters is involved in the modeling of evaporator, drum, etc, the partial derivatives of the density, enthalpy of partial derivatives is even more difficult, this thesis gives idea to solve this problem and makes an error analysis of the results.Based on the theoretical analysis of gas-steam combined cycle and a certain gas turbine, a set of gas-steam combined cycle scheme is designed. according to the workflow of thermodynamic system, the whole system is divided into gas turbine, waste heat boiler and steam turbine three systems, Modular model of CCGT is established and created on the platform of MATLAB/Simulink. We calculate the characteristics of designed CCGT variable condition and analyze the dynamic response characteristics in some typical conditions of step change.This thesis can be functioned as the reference for future application of a certain gas turbine, and lays a foundation for further studies of the program design and system control strategy.