Abstract: This paper mainly introduces the application and operation of the stress-free coil type heat recovery device form ascension pipe introduced in the revamping of No.5 and No.6 coke ovens of Baotou Steel. During the operation time of 2 years, the device operates stably and can efficiently recover the sensible heat of raw gas, which improves the energy saving rate of coke oven and has significant economic benefits.

Key words: Raw gas, Stress free, Coil type, Waste heat recovery