Abstract
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 °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 °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 CO2emissions charges. The conducted economic analysis made it
possible to determine the maximum value of investment expenditures at
which given solutions are profitable.
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