Ammonia synthesis problem
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Dear Haihao friends: If there is 0.3% oxygen in the raw gas, what will be the oxygen content after synthesis in the synthesis tower?
If the fresh gas contains 0.3% oxygen, the oxygen content after synthesis in the converter should be at trace levels.
Oxygen: It oxidizes the catalyst –Fe to an oxide by adsorbing on the active center, and this oxide can be reduced back to iron in syngas, thereby causing repeated oxidation-reduction of the catalyst. This process leads to the recrystallization of iron grains; due to the irreversible growth of these grains, the catalyst activity gradually declines. Therefore, oxygen poisoning is a strong transient poisoning and a weak permanent poisoning.
The oxygen content at the outlet will be very low; it should exit in the form of water vapor. {:1_90:}
Personally, I think it’s 0. What else could oxygen leave behind when it comes into contact with elemental Fe and H2? Why would such a question be asked? High oxygen content is extremely dangerous
The fresh gas for ammonia synthesis should be free of oxygen. It is common for the oxygen content at the inlet of the converter to be present, while it is generally below 0.1% at the outlet