FIELD: heat exchange.
SUBSTANCE: heat-recovery boiler cHRSG comprises a primary water circuit, a secondary water circuit and a tertiary water circuit. Besides, cHRSG comprises feed water pipeline, first heat exchanger to provide heat exchange between feed water pipeline and secondary water circuit and second heat exchanger to provide heat exchange between primary water circuit and tertiary water circuit. In cHRSG, latent heat is partially recuperated from said hot exhaust gas circulating in the bypass stack in the second heat exchanger, and additional heat is extracted in the tertiary water circuit by means of said heat pump, contributing to preheating performed in the primary water circuit heater.
EFFECT: condensing steam boiler (cHRSG) comprises main stack for main flow of hot exhaust gas, bypass stack to allow bypass of a portion of hot exhaust gas past main stream of hot exhaust gas and heat pump.
14 cl, 9 dwg
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