Hydrogenation raw material gas protection

Prevent oxidation and generate coking precursors

This post was last edited by shu8088 on 2012-6-17 07:38. The second floor is only talking about one aspect, the more important thing is the protection of the equipment. There is a large amount of hydrogen and hydrogen sulfide in the materials of the hydrogenation system. If gas protection is not provided during the shutdown and maintenance of the device, the oxygen in the air will neutralize with hydrogen and hydrogen sulfide to form a corrosive medium of polythionic acid. Such corrosive medium has strong pitting corrosion and stress corrosion characteristics. Generally, 304, 321, 316L and other stainless steels are often in good condition before the shutdown, but after the shutdown for maintenance, a large number of leaks occur. Stainless steel materials that are resistant to polythionosulfate require niobium-added stainless steel, that is, TP347. Therefore, during shutdown and maintenance, nitrogen protection is the best measure. :P:P

In addition, in addition to protection, some also have the function of increasing the pressure head of the pump.

The top of the raw oil tank of the hydrogenation unit is generally protected by nitrogen (or other i gas) to isolate the air and prevent the raw oil from oxidizing and forming floc, which will generate cutin in subsequent equipment and pipelines and increase the system pressure drop. In addition, it is also to increase the pressure at the pump inlet and improve the cavitation condition of the pump inlet.

To add to the fifth floor, there are two types of gas seals in hydrogenation devices, one is nitrogen and the other is hydrogenation dry gas.