Application of heat from medium/low temperature flue gas to refrigeration in iron and steel enterprises

Summarizes and analyses the waste heat recovery and utilization of medium/low temperature flue gas in China. Puts forward the reasonable ways for utilizing the waste heat of different temperature flue gas by exergy analysis method. Gives a method to improve both the refrigeration coefficient and the exergy efficiency of refrigerating units driven by the flue gas. Presents a step utilization scheme of the waste heat of flue gas from hot-blast stove, in which the flue gas is firstly used to refrigerate, then to preheat combustion air and gas.