带钢连续涂镀生产线镀后冷却工艺及设备选型设计  

Process and equipment selection design of cooling after coating in a continuous coating production line of strip

作　　者：杜江 王文凡 田茂飞 许秀飞 DU Jiang;WANG Wenfan;TIAN Maofei;XU Xiufei(MCC CISDI Group Co.,Ltd.,Chongqing 401122,China)

机构地区：[1]中冶赛迪集团有限公司,重庆401122

出　　处：《轧钢》2024年第6期67-75,106,共10页Steel Rolling

基　　金：中冶集团181重大研发项目(MCC-181-2022-0105)。

摘　　要：带钢连续镀锌、镀锌铝、镀铝锌、镀锌铝镁、镀铝锌镁、镀铝硅等镀层产品生产中镀后冷却工艺及其设备设计尤为重要。提出了带钢连续涂镀产线镀后冷却工艺的选择原则:液态镀层凝固前只能采用喷气冷却工艺,其中,易氧化的高镁镀层需采用氮气冷却;在镀层凝固过程中根据产品对冷却速度的要求,可采用常温喷气冷却、制冷喷气冷却,也可采用精细气雾冷却或喷粉凝固冷却;对镀层凝固后的冷却,可根据产品力学性能的要求和带钢的温度,选择喷气冷却、气雾冷却、水冷辊冷却、喷水冷却、水淬冷却等形式。详细介绍了喷气冷却、气雾冷却、喷粉凝固冷却3种冷却工艺主要冷却设备的形式分类、应用场景、工艺原理、技术要求、设计方法。提出了以热空气零压溢流为前提和确保冷空气与带钢充分接触对流换热的全新的喷气冷却风箱的设计原则,在此基础上设计出了零压式溢流通道、缝隙式喷嘴、细薄型气流厚度的高效稳定的喷气冷却风箱。对镀锌、镀锌铝、镀铝锌、镀锌铝镁、镀铝锌镁、镀铝硅等镀层产品生产线的设备选型和设计提供了参考。Cooling process and equipment design after coating are particularly important for continuous galvanized steel,galvanized aluminum,galvanized aluminum zinc,galvanized aluminum magnesium,galvanized aluminum zinc magnesium,galvanized aluminum silicon and other coating products.The principle of selecting cooling process after coating is proposed:only jet cooling can be used before the coating solidification,and the high magnesium coating that is prone to oxidation should be cooled by nitrogen;different cooling methods such as normal temperature air cooling,cooling air cooling,fine air mist cooling or spray solidification cooling can be chosen during the solidification process based on the required cooling speed of the product;the cooling of the coating after solidification can be selected according to the mechanical property requirements of the product and the temperature of the strip,such as jet cooling,air mist cooling,water cooling roll cooling,water spraying cooling,water quenching cooling and other forms;the form classification,application scenarios,process principles,technical requirements and design methods of the main cooling equipment of three cooling processes of jet cooling,air mist coolers and powder solidification cooling are introduced in detail.A new design principle of air jet cooling bellows based on zero pressure overflow of hot air and ensuring full contact between cold air and strip convection heat transfer is proposed,on this basis,a zero-pressure overflow channel,a slotted nozzle and an efficient and stable air jet cooling bellows with thin flow thickness are designed.The reference is provided for the selection and design of production line equipment of galvanized,galvanized aluminum,galvanized aluminum zinc,galvanized aluminum magnesium,galvanized aluminum zinc magnesium,galvanized aluminum silicon and other coating products.

关 键 词：带钢连续凃镀 镀后冷却 喷气冷却 气雾冷却 喷粉凝固冷却 设备选型 设计 

分 类 号：TG1[金属学及工艺—金属学]