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A comparative analysis of supercritical and subcritical steam turbine cycles with low-boiling actuating medium has been done. The effect of initial steam parameters at the turbine inlet on the metering, geometric and power characteristics of the turbine was demonstrated using different actuating media. Steam turbine cycles of this type using the mix (multicomponent) medium or single-component actuating medium that define the amount of capital expenditures and have an impact on the further operation of heat flow diagram have also been compared. Computation studies of the flow system of turbines using different actuating media were carried out taking into consideration the thermodynamic properties and peculiarities of low-boiling actuating media in question. The data of computation studies that were carried out using the software system developed by the IPMash of the National Academy of Sciences of Ukraine showed that the selection of actuating medium should be based on the availability of industrial production that would allow us to reduce the procurement costs for it and the costs for the replenishment of leakages (if available) during the operation. When implementing the low-boiling actuating media-based heat flow diagram it is required to compare the efficiency of thermodynamic cycles, and to estimate the specific quantity of metal and the power efficiency of all the components of power plant. It should also be taken into account that the boundary curve of dryness fraction is of an inclining type and therefore to reduce the costs required for the condensation of actuating medium its parameters should be selected in a way so as to bring the expansion process closer to the boundary curve. It has been established that the overall dimensions of the flow system of turbine with supercritical and subcritical parameters change insignificantly; the flow-rate of actuating medium differs within 10 %, and the electric power changes up to 5 %.

vestnik nacionalʹnogo tehničeskogo universiteta "hpi". seriâ: ènergetičeskie i teplotehničeskie processy i oborudovanie/vestnik nacionalʹnogo tehničeskogo universiteta "hpi". ènergetičeskie i teplotehničeskie processy i oborudovanie

Influence of Initial Parameters on the Performances of the Flow System of Turbines Operating on Low-Boiling Actuating Medium