Isibambiso somthwalo wesitsha esibambisana nesimo sokuphatha isimo esikhishwe kwi-boiler smoke kanye nezindiza. Ngokukhombisa isikhombiso sokugibela 900 stroke sokugibela ngokwesinye isimo sokuphatha, kwi-boiler smoke air system kusebenzeka kakhulu ukuphathwa kwesimo sokuphatha esikhulu kanye nezindiza ezintathu futhi ezikhishwe kwi-mill hot air temperature. Kuyisikhombiso esikhishwe kwi-cold kanye ne-hot primary air duct phambi kokungena kwe-coal mill, futhi kusebenzisa ukuphatha isimo sokuphatha se-flue gas kwi-flue nesikhombiso sokugibela esikhishwe nesikhombiso sokugibela sokugibela esikhishwe kwi-recirculating flue gas pipeline. Lesi sikhombiso somthwalo wesitsha sokuphatha asingayeki ukugqoka isimo sokuphatha sesimo se-pipeline, ngakho kufanele kube sebenzise nabambisene nesikhombiso sokugqoka sokugibela futhi isikhombiso sokugqoka sokugibela.