NOUFERROUS METALLURGICAL EQUIPMENT

High-temperature flue gas will be generated in the flash smelting process of copper concentrate. During normal operation, the high-temperature flue gas is recovered by the waste heat boiler and enters the dust chamber and electric dust collector for purification. The purified flue gas is sent to the acid making process by the high-temperature exhaust fan. In the event of a boiler or subsequent process equipment failure, the high-temperature flue gas from the flash furnace needs to be rapidly cooled by the accident flue and sent to the subsequent dust collection and desulfurization system. Based on the process flow and characteristics, the paper developed a spray cooling box for flash furnace emergency flue. High temperature flue gas enters from the bottom of the box and flows vertically upward. The atomized droplets are sprayed vertically downward through the nozzle and downward in the direction of flue gas flow. The two countercurrent contact, mix, and exchange heat in all directions. The tiny droplets quickly evaporate and vaporize under the effect of high temperature of flue gas. The sensible heat of flue gas is converted into latent heat of water vapor, which makes the flue gas temperature rapidly cool to the required temperature and then flow out through the top exhaust port. Through the practical verification of the flash furnace production in the copper smelting technology improvement and renovation project of a certain non-ferrous group, the overall layout is reasonable, the process flow is smooth, there is no liquid water in the cooling box, and various technical indicators meet the design requirements.