WASTE HEAT RECOVERY DEVICE

PROBLEM TO BE SOLVED: To provide a waste heat recovery device that can make effective use of waste heat recovered from a waste heat means.SOLUTION: A waste heat recovery device includes a first and second reactors 2, 3 having a chemical heat storage medium that reacts with a reaction medium to generate heat and absorbs heat to regenerate the reaction medium, and an evaporator 4 that converts the reaction medium from liquid to gas and communicates with the first and second reactors 2, 3 so as to supply the reaction medium. The reaction medium reacted with the chemical heat storage medium is regenerated by waste heat recovered from a factory furnace 100 in one reactor of the first and second reactors 2, 3, while the reaction medium supplied from the evaporator 4 is reacted with the chemical heat storage medium in the other reactor of the first and second reactors 2, 3. Air is heated by the reaction heat and supplied to the factory furnace 100. At the same time, the reaction medium is heated by the waste heat recovered from the factory furnace 100 and converted from liquid to gas in the evaporator 4.