The problem with the fuel gas
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The poor quality of the fuel gas used in my system is causing the control valves of the furnace to get clogged constantly. Strangely enough, Valve No. 1 isn’t affected by this issue, while the control valves of Furnaces No. 3 and No. 4 keep getting clogged! (Restoration four-in-one furnace)
Could you roughly draw a flowchart? Facilitates problem analysis!
Is the amount of combustion gas used in Reactor No. 1 the same as that in Reactors No. 3 and No. 4? I mean, is the opening degree of your control valves the same?
It is related to the fuel gas volume, process sequence, the tendency for blockages at the end of the system, and the opening degree of control valves
There can be blockages caused by a mixture of condensed oil and rust that has corroded away; in cold weather, freezing may also occur in those areas. That’s roughly it. If the two furnaces behind you are at the end of the fuel gas supply line, this kind of situation is likely to arise
It is related to the process and the flow rates of various branches; please provide a simple diagram so that the issue can be analyzed more easily.
I am a equipment technician who manages continuous reforming processes. The loads of the four furnaces are different, so the amount of gas used varies as well, and the opening degree of the control valves is also different. Furnace No. 2 has the highest load, while Furnace No. 4 has the lowest load. Of the 16 burners in Furnace No. 2 that I am in charge of, 13 will be put into use, while of the 8 burners in Furnace No. 4, only 2 will be used. 1. What kind of obstruction is it? It would be best to analyze its composition; this has also happened to me, and it was a crystalline blockage ； 2. If it occurs at low temperatures but not at high temperatures, it is necessary to check the status of heating for the gas lines; the heating and insulation conditions of the gas control valves in Furnaces 3 and 4 should be compared with those in Furnaces 1 and 2 ； 3. If this issue only appeared this year, then it has nothing to do with the gas pipelines; why didn’t it cause blockages in previous years? The cause must be sought at the source of the gas ； 4. If the issue arises after maintenance, then it is necessary to start by examining what was altered in the gas system during that maintenance – for example, whether the foam breaker on top of the gas liquid separation tank is corroded, damaged, or needs to be replaced ； You haven’t provided any more information in your question, so I can only offer suggestions based on my experience.
How do you deal with blockages?
Which petrochemical company in Panjin, Liaoning are you from?