The Modernization Potential of Gas Turbines in the Coal-Fired Power Industry by Ryszard Bartnik

Author:Ryszard Bartnik
Language: eng
Format: epub
Publisher: Springer London, London

5.2 Cogeneration Unit Operating

The most effective way of reducing the consumption of chemical energy of the fuels and emission of harmful products during fuel combustion into the environment is the cogeneration, i.e. concurrent production of heat and electricity. The adaptation of a power unit to cogeneration mode will result in the improvement of the total energy efficiency of its operation. Moreover, its simultaneous super structuring to cogeneration mode will increase this effectiveness to a bigger extent [1, 2]. Modernization of a power unit by repowering it with a gas turbogenerator and the heat recovery steam generator also leads to the improvement of its economic effectiveness. Mainly, this is dependent on the relations of prices between energy carriers, i.e. on price relations of between heat and electricity and fuel prices, coal and gas as well as on the overall capacity of the system, i.e. amount of electricity and heat production in the unit and thereby, on the capacity of a gas turbogenerator and the structure of a waste-heat boiler used to super structure the power plant.

Section 5.1 presents a thermodynamic analysis of the condensing mode of a 370 MW power unit repowered by a gas turbogenerator and a heat recovery steam generator. In this its operation in cogeneration mode is analyzed—Fig. 5.1. Differences between the optimal thermodynamic capacity of the gas turbine for the condensing mode and cogeneration are presented with regard to a 370 MW power unit and relative to the number of degrees of pressure in the waste-heat boiler.

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