The hydrogenation reactor replacement was not successful
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The hydrogenation reactor needs to have its contents removed, and nitrogen purging does not meet the requirements after a long time; I’m looking for any good solutions What are the standards for combustible gases in other refineries?
After being isolated separately, nitrogen was introduced at both the inlet and outlet. In fact, when removing the hydrogenation catalyst, combustible gases are not the main factor that needs to be controlled; it is the oxygen content that needs to be monitored, as the catalyst is removed in an oxygen-free nitrogen environment
Generally speaking, it is difficult to displace combustible gases in the reactor with an appropriate gas. Currently, degassing is carried out in a nitrogen environment, and we do not conduct analyses of the combustible gas content during this process
The last edit to this post was made by RBT@Jiutian on 2015-9-30 at 23:31. Generally, before removing the catalyst, the reactor bed temperature needs to be lowered to around 60°C; the pressure is then relieved and the reactor is filled with nitrogen until the concentration of hydrocarbons plus hydrogen is below 0.5%, which meets the requirements. After the reactor cover is opened, Jiangsu Tianpeng Company proceeds with catalyst removal in an oxygen-free environment. In addition, a rubber tube is inserted into the reactor after the cover is opened to supply nitrogen for protection, primarily to prevent air from entering. Nitrogen can also be introduced into the lower part of the reactor, ensuring that the entire bed remains under positive pressure.
The catalyst replacement in my unit was carried out under anaerobic conditions, with liquid nitrogen continuously flowing through the reactor
The oxygen content after displacement can be below 0.5
Nitrogen protection is sufficient for removing the agent; if it is a spent catalyst, wet method can be used for removal.
It’s best to measure the CO level to prevent the formation of nickel hydroxide
Burn it first and then remove the agent; it’s safer that way