FIELD: system water heating, for instance at thermal power stations.
SUBSTANCE: water heating plant has water boiler with burner, gas supply piping, air duct with fan, gas conduit with smoke exhauster, and delivery-water supply piping with pump. Installed in air duct upstream and downstream of fan and upstream of air heater are heat exchangers communicating at heating-medium end with discharge pipeline and delivery-water supply line upstream of pump; gas conduit inlet communicates with burner through heat exchanger disposed downstream of air heater.
EFFECT: enhanced reliability, reduced fuel consumption under all operating conditions.
1 cl, 1 dwg
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