Connecting the second exhaust-heat boiler to the operating first one under the conditions of flow circuits of combined-cycle plants with two gas-turbine units and one steam turbine |
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Authors: | Yu A Radin I A Grishin T S Kontorovich O B Panshina A V Chugin |
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Affiliation: | (1) All-Russia Thermal Engineering Institute (VTI), Moscow, Russia;(2) “North-West Cogeneration Plant” Company, Russia |
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Abstract: | Problems arising with connecting the second exhaust-heat boiler to the first exhaust-heat boiler under load in the case of
flow circuits of combined-cycle plants of type PGU-450 are considered. Similar problems exist for two-boiler single-turbine
units of type PGU-325 and for two-boiler single-turbine units of traditional steampower plants with an output of 200–300 MW
upon connection of the second furnace of a two-furnace boiler to the operating first furnace. Analysis of the temperature-induced
stressed state and of the cyclic strength of thick-walled elements of the steam-water conduit of PGU-450 and of two-furnace
boilers of two-boiler single-turbine units with an output of 200–300 MW (the check valve, the inlet header of the water economizer)
is used for determining the steam temperature differences in the high-pressure conduits to the steam turbine and the order
of connection of the second exhaust-heat boiler to the operating fist one. Modes of enabling a two-boiler single-turbine unit
of a combined-cycle plant, which are most “rigid” from the standpoint of thermal strength, are determined.
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Translated from élektricheskie Stantsii, No. 2, February 2006, pp. 11–17. |
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Keywords: | combined-cycle plant (CCP) two-boiler single-turbine unit (TBSTU) exhaust-heat boiler (EHB) gas-turbine unit (GTU) steam turbine (ST) pipeline economizer temperature-induced stressed state cyclic strength finite-element method |
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