Heat recovery system, heating furnace system and flue gas temperature control method

Abstract

The application discloses a waste heat recovery system, which comprises a heat exchange device, a flue gas pipeline, a flue gas temperature monitoring device and a temperature medium introduction device. The flue gas pipeline forms a flue gas flow path with a flue gas heat exchange channel of the heat exchange device. The flue gas temperature monitoring device comprises a temperature sensing device and a control device. The temperature medium introduction device is connected with the control device, and one end of the temperature medium introduction device is connected to a temperature medium, and the other end of the temperature medium introduction device is connected to the flue gas flow path. When the temperature sensing device senses that the flue gas temperature is lower than a temperature value, the control device controls the temperature medium introduction device to introduce a temperature medium with a temperature higher than the temperature value, so as to increase the flue gas temperature. The application also discloses a heating furnace system comprising the waste heat recovery system and a flue gas temperature control method. The application can avoid the corrosion of devices caused by the condensate of flue gas with a temperature lower than a dew point temperature, and can significantly improve the reliability of the waste heat recovery system and the heating furnace system without increasing the cost and making large structural changes.

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