At present

the intake temperature of large-scale gas cycle units is gradually increasing

and the heat loss of exhaust gas of gas turbine is steadily rising

it is of great significance to making full use of the exhaust heat of gas turbine to realize the gradual utilization of energy

improve the thermal efficiency of power plant cycle and reduce the economic operation cost. In view of the high efficiency and large capacity of gas turbine combined cycle

of which the common double pressure reheat heat recovery steam generator(HRSG) is used in the steam cycle

this paper establishes a dual-pressure reheat HRSG system model

and introduces quantitative evaluation indicators

to analyze the influence of different thermal parameters on double-pressure reheat cycle system through MATLAB software modeling. By taking the optimum thermal efficiency of steam cycle as the target

it further optimizes the steam parameter matching problem between the dual pressure reheat waste heat boiler and the steam turbine. Secondly

this paper also introduces the boundary conditions in the optimization process to calculate the relative average change rate of different parameters to the double pressure reheat waste heat boiler system

and designs the optimization cycle process. Finally

it obtains the steam parameter optimization data of the double pressure reheat waste heat boiler.