我厂有吹风气锅炉 2台 ,其中 1台 4ｔ/ｈ吹风气锅炉回收 5台 2 4 0 0发生炉的吹风气 ,1台 6ｔ/ｈ吹风气锅炉回收 4台 2 61 0发生炉的吹风气。经过几年的运行 ,现有的 2台吹风气锅炉存在如下问题 :①回收余热效果不高 ;②额定压力1 .2ＭＰａ ,属于低压锅炉 ,蒸汽不能分级利用 Our factory has 2 sets of air-blowing boilers, of which 4 sets of 4t / h air-jet boilers reclaim 5 units of blowing gas from furnaces of 2 040 and 1 sets of 6t / h air-blowing boilers to blow 4 sets of air blowers . After several years of operation, the existing 2 sets of air-blast boilers have the following problems: (1) the effect of recovery of waste heat is not high; (2) the rated pressure of 1.2 MPa belongs to the low-pressure boiler, and the steam can not be used in stages