Cooling system and cooling method of rolling steel

摘要

A cooling system of rolled steel for cooling a long hot-rolled steel comprises a plurality of chambers arranged along the longitudinal direction of the rolled steel. The plurality of chambers are provided, respectively, with an air outlet which supplies compressed air for cooling introduced into the chamber from a gas inlet toward the rolled steel, a nozzle plate having a plurality of nozzle holes provided at the air outlet to face the rolled steel, a cooling water supply nozzle for supplying cooling water into the chamber, and an equalizing plate provided between the gas inlet and the cooling water supply nozzle in order to prevent the compressed air for cooling introduced from the gas inlet from striking the nozzle plate directly. The cooling system sprays cooling medium produced by mixing the cooling water supplied from the cooling water supply nozzle and the compressed air for cooling introduced from a gas inlet toward the rolled steel via the nozzle holes of the nozzle plate thus cooling the surface of the rolled steel uniformly.