Heat recovery system of plant using heat pump

Abstract

Disclosed is a heat recovery system of a plant using a heat pump that absorbs some heat energy wasted from a condenser of the plant. The heat recovery system is constructed such that water condensed by the condenser is supplied to a service water heater via condensate pumps. A heat pump is installed between the condensate pumps and the service water heater for receiving the condensed water and the coolant. Some of the condensed water and the coolant, having passed through the heat pump, are supplied to a coolant inlet port of the condenser, and the remaining portions are supplied to the service water heater. The condensed water supplied to the service water heater is heated by a three way valve through which service water heating steam is supplied. Some of the steam is directly recovered to the condenser via a combustion air heater.

1 . A heat recovery system of a plant using a heat pump constructed such that water condensed by a condenser in which a coolant flows from a coolant inlet port to a coolant outlet port to condense steam into water is supplied to a service water heater via a plurality of condensate pumps, wherein
 the heat recovery system comprises a heat pump installed between the condensate pumps and the service water heater for receiving the water condensed by the condenser and the coolant discharged from the condenser, the coolant, having passed through the heat pump, is supplied to the coolant inlet port of the condenser, the condensed water is supplied to the service water heater and heated by a three way valve through which service water heating steam is supplied, and the service water heating steam, having passed through a combustion air heater, is directly supplied to the condenser.   
     
     
         2 . The heat recovery system according to  claim 1 , wherein the heat pump is constructed so as to recover heat by directly receiving steam from the condenser. 
     
     
         3 . The heat recovery system according to  claim 1 , wherein the heat pump is constructed so as to heat combustion air and supply the heated combustion air to a boiler. 
     
     
         4 . The heat recovery system according to  claim 1 , wherein the heat pump is constructed so as to recover heat energy from exhaust gas having increased temperature and to use the recovered heat energy to heat district heating water or a fuel system.