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Calculation of a 900 MW conceptual 700/720ºC coal-fired power unit with an auxiliary extraction-backpressure turbine

Stępczyńska K., Kowalczyk Ł., Dykas S., Elsner W.

Journal of Power Technologies

2012

Vol. 92, nr 4

266--273

This paper presents the calculations for different configurations of a 900 MW power unit for advanced 700/720°C ultra-supercritical steam parameters with a single and double steam reheat. The use of such high parameters, especially the reheated steam temperature, involves thermodynamic and material problems related to high temperature differences in the feed water heaters. In relation to this, a concept of the modification of the feed water heaters system by using an auxiliary extraction-backpressure turbine fed with steam from the cold reheat steam line is presented. The steam from the bleeds and the turbine outlet is directed to regenerative heaters fed in the classical system from the intermediate pressure turbine, which reduces the temperature differences in these exchangers and simplifies the main turbine IP part structure.

Thermodynamic and economic analysis of a 900 MW ultra-supercritical power unit

Łukowicz H., Dykas S., Rulik S., Stępczyńska K.

Archives of Thermodynamics

2011

Vol. 32, no. 3

231-245

The paper presents a thermal-economic analysis of different variants of a hard coal-fired 900 MW ultra-supercritical power unit. The aim of the study was to determine the effect of the parameters of live and reheated steam on the basic thermodynamic and economic indices of the thermal cycle. The subject of the study was the cycle configuration proposed as the "initial thermal cycle structure" during the completion of the project "Advanced Technologies for Energy Generation" with the live and reheated steam parameters of 650/670 [degrees]C. At the same time, a new concept of a thermal cycle for ultra-supercritical parameters with live and reheated steam temperature of 700/720 [degrees]C was suggested. The analysis of the ultra-supercritical unit concerned a variant with a single and double steam reheat. All solutions presented in the paper were subject to a detailed thermodynamic analysis, as well as an economic one which also included CO2 emissions charges. The conducted economic analysis made it possible to determine the maximum value of investment expenditures at which given solutions are pro.table.