Simulation Of Performance Of Steam Injected Gas Turbine

The Steam Injected Gas Turbine cycle which is called STIG in short is an advanced common circulation of acting with duplex working substance. When the STIG cycle came out, it attracted the people's universal attention because of it's many merits, rapidly developed, and becomes one of the focuses in the gas turbine combined cycle research fields. The model of Steam Injected Gas Turbine studied in this dissertation uses the multistage high-pressured flash vessels instead of the conventional heat recovery boiler as the steam producing device. Its application scope will be more widely not only because the smaller scope it takes and it's higher heat recovery efficiency, but also it can make up for the shortcoming of high quality requirements in the heat recovery boiler, can produce steam directly using the sea water. In the ship, the partial steam which the lower-stage flash vessels produce may provide the life required fresh water for the crew after it has been condensed, so it don't have to setup the special desalination system. It has great significances for the marine gas turbine.In this dissertation, the MATLAB/Simulink software was used to simulate the dynamic process between different status of the STIG system. In the process of modeling, the modular modeling idea was used to build the non-linear models the main components of STIG system, considering of the thermal characteristics change of the working substances in the circulation, the inertias of the components, these models can be used commonly. At the components characteristic curve treatment, the Neural Network was used to deal with the compressor and turbine components characteristic curve, it has been confirmed that the results had high precision. The main work and conclusions of this dissertation were as follows:1.The stable state parameter of the STIG system under the different operating status was simulated, and the performance parameters were compared with the gas turbine of simple cycle, the results show that the performance of the STIG system is much better than the gas turbine of simple cycle.2. The steam injecting process of the STIG system was simulated, the parameter change of the gas turbine during the steam injection was analyzed, the results provide a reference for the study of the steam injecting rule and the adjustment rule of the steam producing device.3. The transient process of the characteristic parameters under the different fuel feeding rule was simulated, the dynamic curve of the main parameters during the transient process and the dynamic performance of the STIG system were analyzed, a suitable fuel feeding rule was found.4. Some measures were brought out after the analysis of the STIG cycle and some of the results. It lays a good foundation for the study of the Chemical Heat Recycle Gas Turbine in the next stage.