A SERIAL CONNECTION OF A SUPERCRITICAL COAL FIRED POWER PLANT WITH GAS TURBINE INSTALLATION

The paper shows the results of thermodynamic analysis of a supercritical coal fired power plant integrated with gas turbine installation. The interferences into the reference plant characterized in the paper consisted on successive elimination of regenerative exchangers and replacing them by the exchangers fed with exhaust gases from the gas turbine installation. This variant permits on the partial or entire replacement of regeneration exchangers - high- or low pressure. In calculations the number of replaced regenerative heat exchangers was determined by the sum of ratios of replace of regeneration defined separately for every heat exchanger. In the process of elimination, the power rating of the gas turbine unit was increasing in accordance with the established series of types, what permitted for the substitution of an increasing number of regenerative heat exchangers. In simulations the constant values of characteristic parameters of gas turbine for each power rating level were assumed. Elimination for the turbine with the smallest predicted power began from the heat exchanger characterized by the highest temperature level of the circulating medium of the power plant. Simulations for further interferences into the reference system were conducted in accordance with established criteria relating to the desired limit values of selected characteristic parameters. The aim of this study was to determine the values of the key indicators of the thermodynamic evaluation, which are defined in the paper content. For analyzed variants the overall surface area of flue gases/water heat exchangers was calculated.