Numerical Calculation And Optimization Of Thermal Processes In Regenerator For Zinc Distillation Regenerative Furnace

Hot-galvanizing is the most fundamental, most widely-used and most effective method of protecting iron and steel from being corroded all over the world. In this process, the large amounts of pure zinc was needed and to consume and output much Hot-galvanizing dross. The total output of dross in our country is100,000ton annually. Hot-galvanizing dross is a zinc regeneration resource of very high zinc content, and the recycling of dross also can extent the service life of zinc resource, as well as reduce product energy consumption, decrease environment pollution and increase social and economic benefits.The zinc was recovered from Hot-galvanizing dross using distillation. The main equipment is tower-type zinc refining furnace. This device is a mature equipment, which is widely used in the purification process. This device uses the traditional clay-type heat exchanger, which has lower heat transfer efficiency, the higher exhaust gas temperature, the larger area. In the high-temperature waste heat recovery unit, the regenerative combustion technology with high recovery efficiency and the broader scope of application. The mature heat accumulating type combustion technology is applied to the tower-type zinc refining furnace, for the purpose of recycling the afterheat of waste gas in most ultimate, reducing the waste gas temperature, improving the furnace heat efficiency and cutting down fuel combustion.Because of the horizontal temperature in Zinc distillation furnace was required in±5℃.Otherwise, the internal SiC tray is easy to damage. Combustion chamber temperature distribution was affected by outlet air temperature fluctuations of Regenerator. It is necessary to find reasonable measures to reduce regenerator temperature fluctuations by focusing on analysis of regenerator.The commercial software Fluent was used to analysis different materials, different ball diameter and material. Then get the temperature distribution, heat transfer coefficient, heat power and other thermal parameters in the Regenerator. The relevant structural parameters of Regenerator were finalized.Based this analysis, the regenerative combustion system applied to zinc distillation furnace is feasible to meet the zinc distillation furnace temperature at±5℃process requirements.