Abstract

In order to increase cost effectiveness of steam-gas power station, it was suggested to place heat exchange surface in backend part of wasteheat boiler downstream of condensate gas pre-heater to heat feedwater before it is transferred to chemical treatment. Estimations have been made for steam-gas unit PGU-450. In process conditions of steam-gas unit operation, wasteheat boiler energy conversion efficiency increases from 82.65% to 84.97% (by 2.32%) when gas feedwater heater is installed in its low-temperature area. In addition to this, steam-gas unit efficiency increases from 52.99% to 53.53% (by 0.54%) and specific consumption of reference fuel for power generation is reduced by 1.01% (from 232.12 to 229.78 g/(kWt⋅h)). Savings of reference fuel in monetary terms for steam-gas unit with the capacity of 452.35 MWt and running time of 6500 h/year and reference fuel priced at 3000 rub/t of reference fuel are amount to 20 million 640 thousand rubles per year.

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