Why must the oxygen content in the system be below 0.5% when a nitrogen cycle is established in the hydrogenation unit?
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Does this have any effect on the catalyst? ? ?
Where is the limit for a hydrogen explosion?
The nitrogen cycle is used for drying; after that, hydrogen is introduced for sulfidation. For safety reasons, a low oxygen content is required.
To prepare for the introduction of hydrogen, in order to prevent the formation of explosive mixtures that could pose a danger. For gases with a burst pressure limit of 4% or higher, the oxygen content in the system must be below 0.5%; when the lower limit is below 4%, the oxygen content must be below 0.2%. National standards specify this clearly.
Where did I see this rule, in what material?
The explosion limit of hydrogen is 4.1% to 74.2%. Prevent accidents from occurring
Which national standard document specifies this?
When a hydrogenation catalyst comes into contact with oxygen, an oxidation reaction occurs, releasing a large amount of heat that causes the temperature of the bed to rise