Handling of wax oil hydrogenation accidents
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My unit is a wax oil hydrogenation unit that primarily supplies raw materials to downstream catalytic units. I have some doubts regarding whether it is necessary to cut off the reaction feed during accident handling – specifically, should the feed pump be stopped? For example, as stated in the operation manual, when the new hydrogen compressor is shut down, it is sufficient to reduce the temperature and flow rate, and the unit can operate in its normal circulation mode. However, when the reaction heating furnace is shut down, if the temperature at the furnace outlet falls below 280 degrees, the reaction feed must be cut off and the unit should operate in its recycle mode. My question is: under what conditions is it necessary to cut off the reaction feed? Are there any specific criteria for this, and is it related to the reactor and the catalysts?
Is it because the temperature is too low? The wax oil has a high viscosity and there is a lot of residue, which may cause coking of the catalyst; generally, diesel needs to be used to flush the catalyst bed at around 280 degrees. Also, the reaction heating furnaces have all stopped – what’s the point of feeding material in anymore? All the dirty oil has ended up in the catalyst bed
Stop the compressor and the heating furnace; feeding must also be halted immediately. Interlock logic is provided in the system for this purpose, mainly to protect the catalyst
Stop the compressor and the heating furnace; feeding must also be halted immediately. Interlock logic is provided in the system for this purpose, mainly to protect the catalyst