Optimization Research Of Gas Turbine Cycle And Combined Cycle

The main research contents of this paper are performance parameters optimization of various thermodynamic gas turbine cycle and gas-steam combined cycle. Taking the powerplant efficiency and specific work of the cycle as the objective function, the computation modules were built for the various cycles. Calculation optimization of various kinds of thermodynamic parameters were carried out by the software Matlab.Computational procedure of hermal properties parameters of working substance (air,fuel gas,vapor) were compiled, and the average of specific heat at constant pressure was improved in the process of constant entropy; estimation model was built for the cooling air volume of gas turbine and the first stage stator, the tempture of gas turbine exhaust and expansion work of gas turbine were improved according to volume of cooling air; find out how to select the pressure ratio (expansion ratio) of high-pressure and low-pressure compressor (turbine) can guarantee the specific work and efficiency of intercooled cycle gas turbine (reheat cycle gas turbine), select different kinds of steam and water system of HRSG in according to the temperature of gas turbine exhaust and optimized the parameters of steam and water circuit in order to take full advantage of gas turbine waste heat in steps; a fairly set of computational procedure of gas turbine cycle and steam turbine cycle was established on the MATLAB platform. The procedure can optimize parameters of gas turbine according to the user's requirements, and select the steam and water system (single-pressure, dual-pressure, triple-pressure, reheat)according the temperature of gas turbine exhaust, calculate the three-dimensional optimized parameters of steam and water system, draw the parametric diagram of steam and water system and enthalpy-entropy diagram of steam turbine expansion process automatically.