Regarding the maintenance tasks for the catalytic external heat exchanger
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The company is carrying out a major overhaul of its equipment, which involves the catalytic external heat exchanger. As for the details of the maintenance work on this external heat exchanger, it is not possible to determine the final steps yet; therefore, I am here seeking guidance from all of you experts.
:Is the external heat exchanger for handshaking being serviced as part of routine maintenance, or is it being repaired because of a problem? This needs to be made clear so that others can communicate with you properly.
If no problems occur during use, it is necessary to stop the operation and conduct inspections first, such as checking for internal wear and ensuring that the finned tubes are in good condition; the specific repairs required will be determined based on the results of these inspections. If there are signs of failure during use, then a plan should be determined based on the assessment.
During routine maintenance, the plant is shut down for an extended period of time, during which all equipment is inspected. No problems occurred during initial use
The unit was shut down for a long time for major maintenance; a maintenance plan needs to be developed for external heat extraction, as there were no issues during its operation in the earlier stages
Then you can develop a plan; the plan should specify that inspections should be carried out first, and repairs should be done based on the results of those inspections. The plan must outline who is responsible for the repairs, the timing of these repairs, as well as the safety measures to be taken (such as restrictions), along with emergency procedures. This is what we require here.
Could you explain what aspects might have problems and how to solve them?
First, check whether there is any noticeable wear on the finned tubes inside the external heat exchanger, then measure the wall thickness； Fluidization air duct in the external heat exchanger; check for wear on the nozzles ； Check whether the pipe supports and clamps of the fixed fluidized air duct are worn ； Check whether there is any damage to the liner of the external heat exchanger, and whether there is any damage to the internal components of the steam drum of the external heat exchanger ； Steam drum safety valve set pressure, etc. A preliminary plan can be drafted first; the details will be determined after inspection.
It should be an inspection rather than maintenance, but it’s probably impossible for people to get in, right?
The cycle has arrived; it’s time to remove the tube bundle and inspect the shell lining. The workload is quite large; a plan is needed