Numerical Simulation Study on the Impact of Import and Export Modes on Heat Transfer of Jacketed Coke Oven Ascension Pipe Heat Exchanger

The heat produced by coke oven gas (COG) accounts for 36% of total heat of coke oven, indicating a significant potential for heat recovery. To effectively recover this heat, a jacket-type heat exchanger was installed at the coke oven ascension pipe. This study uses Fluent software to simulate the jacket-type heat exchanger and determine the impact of the number and direction of the heat exchanger’s inlets and outlets on heat transfer. The results show that increasing the number of water jacket inlet and outlet pipes improves the uniformity of temperature, pressure, and flow field distribution on the water jacket side, but increasing the number of inlet pipes reduces the Nusselt number on the water jacket side by 3%. Changing the direction of the water jacket inlets and outlets at the riser, with tangential inlets, improves the uniformity of the temperature and flow field distribution on the water jacket side, with minimal effect on pressure distribution and a slight impact on the temperature and pressure distribution on the coke oven gas side. A double-inlet double-outlet configuration with tangential inlets and outlets results in relatively uniform temperature, pressure, and flow field distribution within the heat exchanger, making it an ideal model for a jacket-type heat exchanger. These findings are valuable for understanding the heat transfer characteristics of jacket-type coke oven ascension pipe heat exchangers and have important guiding significance for the design of such heat exchangers.