Abstract：In some cases, there is a great amount of waste heat from the gas discharged by the cyclone separator. In order to recycle the waste heat of flue gas, save energy and reduce emissions, heat exchange tubes of different diameters were installed on the outside of the cyclone wall. The separation efficiency and heat transfer efficiency of cyclone separator before and after installing heat exchange pipes with different diameters were compared and analyzed by numerical simulation. The numerical results show that the installation of 80 mm and 100 mm diameter heat exchange tubes has little effect on the internal flow field of the cyclone separator, and the separation efficiency of the two models is reduced by an average of about 1% compared with that without heat exchange tube. Besides, compared with the 80 mm diameter heat exchange tube, the cyclone separator with a 100 mm diameter heat exchange tube has a gas temperature drop of about 2 ℃, and the heat transfer coefficient of the two models on the heat transfer surface is almost the same. Finally, due to the high flow rate of the processed gas and the large amount of heat absorbed, it is the best to use a cyclone with a heat exchange tube with a diameter of 100mm. The research can offer a reference for the design and optimization of cyclone separators that take into account both separation efficiency and waste heat recovery effect.
