FLUE GAS WASTE HEAT RECOVERY SYSTEM FOR CONCURRENT BOILER

摘要

Disclosed is a flue gas waste heat recovery system for a concurrent boiler the system comprising a first and a second heat exchanger wherein the first heat exchanger is arranged at a high temperature side of a flue and comprises a heat absorption section and a heat release section with the heat absorption section and the heat release section being connected to form a circulating loop via a first pipeline and the heat absorption section being arranged in the flue; the second heat exchanger is arranged on a low temperatu re side of the flue and comprises an inlet and an outlet header of a second pipeline; the first and the second heat exchangers are connected via a third pipeline the heat release section of the first heat exchanger being arranged in the third pipeline; and a medium to be heated flows into the third pipeline in turn enters the second heat exchanger through the inlet header of the second heat exchanger and flows out through the outlet header of the second heat exchanger. The waste heat recovery system is able to reduce the temperature of a flue gas even further thus greatly increasing the space for energy saving recovery of the boiler flue gas waste heat reducing the temperature of the boiler flue gas into desulfurization and dust removal equipment and economizing the operating costs of the desulfurizatio n equipment.