Why is it necessary to carry out hydrophobicity before sterilizing tail gas?

Tail gas sterilization before hydrophobic because, because the air is a non-condensable gas, can not be liquefied, so the condensate layer on the wall of the pipe in the equipment on the inside of the formation of the air layer, due to the low thermal conductivity of the air, so that the steam and the heated heat exchange between the ability to significantly reduce. Therefore, it is necessary to pipeline or heat equipment in the condensate and air timely exclusion to improve the efficiency of heat exchange.