Pre-conversion catalyst and medium-conversion catalyst venting precautions for hydrogen production units
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Hello, experts. What are the potential hazards and protective measures during the shutdown and catalyst drainage process of hydrogen production units, specifically for the pre-conversion catalyst Z503R and the medium-conversion catalyst?
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No special treatment is required for unloading the hydrogen production conversion catalyst, and pre-airing of the reduced nickel-based catalyst does not generate heat. The medium-temperature catalyst, once unloaded, requires oxidation treatment; otherwise, the catalyst exposed to air undergoes intense oxidation and releases a large amount of heat, leading to \"combustion\" and posing a risk of burns to operators. Users who have encountered the situation of discharging \"bao li\" should not spray water directly on the thus discharged medium-temperature catalyst; this practice is not recommended in factories with strict environmental protection requirements.
If the catalyst is not passivated before being removed, it will release a large amount of heat when exposed to air, which can lead to fire accidents. It is recommended to passivate the catalyst before removing it. Additionally, the catalyst that is removed constitutes solid waste, and it must be processed and recycled by qualified manufacturers.
There’s no major issue with the conversion catalyst; before removing it, nitrogen is used to continuously cool it down until its temperature drops to that of the surrounding environment. Once the discharge hole is opened, the catalyst can be removed without any significant problems.
Proper protection against catalyst dust is necessary; dust-proof clothing must be worn； Pre-conversion catalysts tend to accumulate carbon deposits; the carbon has a high level of activity, which can produce sparks, but it does not cause fires ； The conversion catalyst must be passivated (using high-temperature steam and liquid water) before being unloaded, to prevent combustion in contact with oxygen in the air.