Because the speed of the fan for soaking furnace in the blooming shop could not beadjusted,a lot of hot air wasted during reheating, charging and discharging.

• 莱钢轧钢厂初轧车间均热炉烧钢供风系统，原设计风机不能调速，在烧钢的均热及装、出炉阶段，有大量的热风放掉，并有部分的过剩风量进入均热炉坑。