Coking of reaction oil and gas pipelines
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Dear seniors, what could be the possible reasons for coking in the large oil and gas pipelines at the outlet of the catalytic cracking settler? Please help.
Coking in large oil and gas pipelines is inevitable; the only solution is manual coking removal. Possible reasons: high temperature, long residence time, low flow rate, high pressure drop, etc. For reference.
I agree with what was said above; we are monitoring the coking situation, so please ask the coking removal team to carry out hydraulic coking removal
The high properties of the raw materials, along with a high content of heavy components in the reaction gas oil, also increase the tendency for coking in settlers and oil and gas pipelines； Is there a problem with the nozzle or was it improperly selected? ； Unstable operating conditions are also an important factor; significant changes in the raw materials lead to reduced nozzle efficiency, which in turn results in variations in the amount of oil and gas produced, causing the flow rate into the oil and gas pipelines to be too low. Coking removal also varies depending on the situation – in oil and gas pipelines with cold walls, high-pressure water guns cannot be used for cleaning; manual cleaning is required, which is quite labor-intensive.
The processing capacity of the device meets the design requirements; the operation is smooth, the processing volume is as high as possible, and the pipeline insulation effect is good. During the shutdown for maintenance, coking was observed at half of the feed inlet to the fractionator, but the reaction process was not affected.
Excuse me, are there any examples of online defocusing? Through pressure drop measurements, we found that the coking occurs in our unit mainly at the inlet to the oil-gas fractionation tower
Poor nozzle performance leads to coking in the lift pipe; coking in large oil and gas pipelines is caused by long residence times, low flow rates, and high pressure drops