Questions regarding the reaction riser nozzle
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Dear experts, we are facing a problem at our facility: there is severe coking at the feed oil nozzle located in the lift pipe. We are currently carrying out maintenance work to remove the clogged nozzle. I would like to ask those with experience – what are the precautions that should be taken when removing this nozzle? How do I disassemble it?
From the information I’ve seen, it seems quite difficult to disassemble it; force is the only option. If asbestos rope or something was wrapped around it during installation, it should be easier to deal with...
It’s not necessary for the installation to be symmetrical; the same applies when disassembling and inspecting. Coking can only be dealt with by using gas welding to apply heat, and it needs to be handled slowly. In any case, when completing the maintenance and restoring everything to its normal state, remember to use asbestos rope – this will prevent catalysts and oil from getting inside and causing coking.
Well, now, after discussion by the factory’s management, it seems they plan to use a jack to pull it out; I think that should work fine
If this is resolved by force, it will be damaged, but the leader doesn’t want it to get damaged, sigh
Force isn’t necessarily meant to cause destruction; when coking is severe, one can only try to proceed slowly
Thank you for your reply. The problem has now been resolved. There was a manhole at the feed oil nozzle of the riser; it was removed by hitting it with a copper rod and then heating it from the outside using gas welding. (Using a jack doesn’t work; the coking is too severe, so it can’t be removed.)
Entering through the manhole and using a small chisel to pry apart the carbon deposits between the nozzle and the sleeve works very well. Basically, no destruction is needed. It is pulled from the outside using a chain block.
Entering through the manhole and using a small chisel to pry apart the carbon deposits between the nozzle and the sleeve works very well. Basically, no destruction is needed. It is pulled from the outside using a chain block.
Just get it down. It takes so much effort just for one nozzle; it’s hard to carry out catalysis properly.