Process and equipment selection design of cooling after coating in a continuous coating production line of strip
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 alumi-num 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 coat-ing 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 de-tail.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 ef-ficient and stable air jet cooling bellows with thin flow thickness are designed.The reference is provided for the selection and de-sign of production line equipment of galvanized,galvanized aluminum,galvanized aluminum zinc,galvanized aluminum magnesi-um,galvanized aluminum zinc magnesium,galvanized aluminum silicon and other coating products.
continuous coating of stripcooling after coatingair jet coolingair mist coolingpowder solidification coolingequipment selectiondesign
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