Another problem can occur rarely if backflow of process gas is permitted into the secondary air feed line . 如果工艺气体回流入二段空气管线,能发生另外的很少发生的问题。
2.
These manifolds are connected to the vacuum system through air take - off lines in order to remove the non - condensable gases from the condenser 这些集管通过空气管线与抽真空系统相连,以便从空冷凝汽器内抽走不可冷凝的气体。