Coking on the outer wall of the spiral rising gas pipe inside the settler
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How should coking on the outer wall of the lift pipe inside the centrifuge of the settler be dealt with during maintenance?
We used to chisel them by hand ourselves, but later we mostly outsourced it – and we ended up covered in dust!
Of course, they all have to be smashed down; otherwise, they’d just be there to bore people. :When performing cross operations with L, it is essential to take proper precautions, as large pieces of coke falling down can easily damage equipment or injure people.
The coke here must be removed. During maintenance, all areas inside the settler need to be inspected; the coke should be cleared to prevent it from catching fire or falling off and blocking the material legs
It is mostly done manually; if not cleaned, the coke particles will fall and block the stop valves when operations start, which can cause serious delays.
Those involved in catalysis are willing to go anywhere, they have to do whatever job is required! That area you mentioned really does need to be dealt with carefully; it’s not safe to leave it to unqualified personnel, as an incomplete cleaning can have serious consequences (falling off of the burnt residues, blockages in the material channels, leakage of substances, and shutdowns). We lowered a soft ladder from the exhaust pipe outlet (collection chamber) and had a slim, clever, and capable colleague use a steel rod to break it off. The material legs need to be sealed in advance; if the coke lumps are too large and block those legs, it will be difficult to clean them. This task is very difficult to carry out and involves working at great heights; be sure to fasten your safety belt properly and pay attention to your own safety.
Go down below the riser pipe? This is really difficult. How to seal the material legs? Prevent the clumps from falling down
This solution is suitable for devices with a large centrifugal force. I don’t know how large your device is? Gas collection chamber or collector pipe? What is the inner diameter of the riser tube? If it’s too small, people still won’t be able to enter. The material leg seals can be made using buckets similar to those used for pumping water, with a large opening at the top and a small bottom; a rope is tied to them and they are lowered down. When cleaning the coke deposits, these buckets are used to break them up, and once they contain too much coke, they are pulled back up and the contents are poured out.
For small catalytic units, it’s not possible for people to get inside – so how is that handled?
It gets blocked at the bottom of the ash hopper; once the area above is cleaned, someone goes down to clean the bottom of the hopper, pack the ash into bags, and carry it away
The number of spin separations required for small catalysis can be reduced, but the size of the spin separation cannot be too small, otherwise it will be difficult to carry out maintenance. I don’t have any experience in this area, nor do I have any good solutions. Coking in the swirler lift pipe was not a significant issue in the past; it only occurred when the raw material was too heavy, of poor quality, or when the system operated at low load for extended periods. These days, rivets are generally added to the outer wall of the intake pipe to prevent cinder fragments from falling off.