vacuum support

The problems of traditional hot wall transfer line of vacuum tower, such as more heat displacement of the horizontal pipe at low velocity, large pushing force on the tower support and severe sulfur corrosion, etc., are analyzed.

剖析了传统的热壁减压塔转油线存在的低速段水平直管热位移量大，对减压蒸馏塔和支架的推力大，硫腐蚀严重等问题。

On this basis, we can draw some lessons. Again, the operation of any system is not in a vacuum, certain foundations are needed. The securities of the operation& support system, including theoretical, policy and organizational supports will be discussed.

再次，任何体系的运行都不是在真空中进行的，都需要为其提供一定的基础，为此，NAEP的运行的保障&支持系统，包括理论保障、政策保障和制度保障也将予以讨论。