Abstract: To study the heat transfer process of flues in 5.5m coke oven with waste gas circulation, the heat transfer mechanism of flue in coke oven's combustion chamber and gas exchange process of twin flue were analyzed; the simulation models of upflow flue and downflow flue were built respectively. According to tables of coke pushing and coal charging sequence in coking production, combining with gas exchange process in twin flue, the simulation analysis on surface temperature characteristics of twin flue walls in real coking production process were achieved by the designed simulation model. The simulation results show that the surface temperature of wall varies periodically; the surface temperature curves of downflow flue wall are gradient distribution with uniform intervals, but in middle and upper part of upflow flue wall, the temperatures of surface are higher and almost equal; on the macro level, the surface temperature curves of twin flue walls present ‘W' style.

Key words: coke oven, twin flue, heat transfer process, gas exchange, modeling