Mathematical Model of a Power Unit with Rated Capacity of 370 MW After its Modernization to Cogeneration and Combined-Cycle
This chapter introduces a mathematical model of a coal-fired electric power unit with the rated capacity of 370 MW. This model makes it possible to examine the effectiveness of the thermodynamic and economic efficiency of its conversion to cogeneration and to dual-fuel gas-steam combined-cycle in parallel system as a result of repowering by a gas turbine. The cases examined include repowering of a unit in a parallel system with a single-, dual-, and triple-pressure heat recovery steam generator. The model is based on mass and energy balance, energy characteristics of facilities, thermal and calorific equations of the circulation media—steam and water. The presented model is general. It is possible to apply it to power units of various capacities. Following a change in a power unit capacity will only necessitate the adaptation of some of the mass and energy balances.