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南热投运的两台上锅406型锅炉,十余年来做了不少改造。但汽温一直偏高,还不时出现过热器区结渣。喷水量达原设计(5～6t/h)五倍以上。再热器温也需喷水控制,烟气再循环不能投入。将喷水源改在高加前收效也不大。屏和对流过热器间导汽管改成大交叉后,只降低一些单管温差,总体温度水平仍很高,常发生结渣停炉。1983年底在屏后装了两台长吹灰器,方消除过热器堆渣。
South heat put into operation two sets of boiler 406 boiler, do a lot of transformation in more than ten years. But the steam temperature has been high, but also from time to time appeared superheater zone slagging. Water spray up to the original design (5 ~ 6t / h) more than five times. Reheater temperature also need water control, flue gas recirculation can not be put. Sprinkler will not be effective before the change. Screen and convection superheater into the big cross between the steam pipe, only to reduce the temperature difference between a few single tube, the overall temperature is still high, slagging often happen shutdown. At the end of 1983, two long-soot blowers were installed behind the screen to eliminate superheater slag.