Blockage in the gas pipeline after electrostatic precipitator and before the fan
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Can drilling be done under pressure? Is there any other way?
It’s unlikely that a gas pipeline about 1 meter long would become completely blocked; it’s necessary to find out the cause before taking any action, as this area is very sensitive.
Taking a look at Issue 4 of 2011 of \"Fuel and Chemical Engineering\" might be helpful to you.
Should I explain the details? There’s no reason for a blockage here under normal circumstances. Was the judgment incorrect?
Indeed, it’s difficult for a 1m-long pipe to get clogged. Could it be that the valve disc has fallen off? Check valve? It’s frozen? Something like that. .
If there is naphthalene or salts inside the pipeline, it is possible to make an opening under pressure and spray for flushing.
It is possible to make an opening in the gas pipeline in front of the fan while it is under pressure, but it isn’t 100% safe. Check whether there is tar residue blocking the pipeline; in spring or early winter, naphthalene buildup can easily occur. If it is indeed blocked by tar residue, the only solution is to perform pipe flushing or dredging.
There is no clear reason for the blockage in the gas pipeline after electrostatic capture, and the gas cannot be discharged from the flange at the front of the machine; it is necessary to analyze the cause before attempting to make an opening under pressure.
Reply to 7# hao101029: It indeed contains components such as tar residue. I’ve heard that some coking companies carry out hole-opening operations under pressure; I’m not sure how this is done and whether it’s feasible
If it is confirmed that the impurities are tar residues and naphthalene, steam backflushing can be applied at the liquid outlet pipe under the pre-machine valve (backup fan) to clean them. If it’s tar residue, it’s really puzzling; I wonder what the coking process used in the owner’s coke oven is like, and whether the coal mixture contains components such as petroleum coke
A similar situation occurred in our plant as well: the resistance in the electrostatic precipitator was too high. After opening the bypass valve for the electrostatic precipitator, the resistance decreased