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2 2011

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Modelling the steam turbine cycle for ultra-supercritical coal-fired power unit

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

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

2011

nr 140

205-214

The main way to improve the efficiency of a new power plant is to increase the live steam parameters. The paper presents a review of a design of an ultra-supercritical steam cycle. The steam turbine configuration for a selected ultra-supercritical application depends mainly on the number of reheats, the power unit rating, the site back pressure characteristics, number of bleeds. Increasing the live steam parameters usually constitutes the greatest contribution to the rise in the efficiency of a power unit, but the sum of efficiency gains related to the application of other solutions can also be significant.

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.