Help. The problem is that the C2 content in liquefied gas is extremely high
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Previously, the C2 content in the liquefied gas produced by my unit was generally no more than 1%, but today it suddenly rose to 5%–7%. After checking all the process parameters, no significant abnormalities were found; the amount of gas released during separation was slightly lower. I adjusted the operating conditions by raising the temperature at the bottom of the separation tower to above 150 degrees, but the C2 level remained extremely high. Also, a few days ago, a small amount of water entered the absorption stabilization system, causing the level in the stabilization reflux tank to reach its limit; this led to liquefied gas containing water, which was later removed. Is there a connection with high C2 content? ? ?
Is there any change in the temperature of the condensate oil entering the separation tower?
Reply to 2# Noon: There isn’t much change; did it rise a few degrees again this afternoon?
Reply to 1# 7281lgh: The C2 value for liquefied gas is only related to the temperature used in the separation tower. The issue you’re experiencing might be due to faulty equipment in the laboratory; we’ve had several similar abnormalities here as well, and upon inspection it turned out that the equipment was broken
I agree with the view from the second floor: the absorber is used to separate C1 and C2 and absorb them using heavy gasoline, thereby ensuring that few heavy components are carried along. The rectifier then vaporizes the C1 and C2 that have been absorbed and sends them back to the absorber; as a result, by the time they reach the stabilizer, almost all of them are components of C3 or higher. The high level of C2 is due to problems in the earlier stages, and there is no cross-contamination in the stabilizer. I think it might be a problem with absorption; check whether the compressor load has changed and whether the amount of gas has decreased. It’s possible that you’re absorbing too much – reduce the absorption dose or increase the stability at the bottom of the desorption tower. Without knowing the specific details of your installation, this is all I can say
Please check whether the thermocouple at the bottom of the reactor is functioning properly?
There is a situation that occurs mostly in winter, where the temperature at the outlet of the rich gas condenser on the compressor side is too low; this results in a low temperature of the condensing oil, an increased load on the separation tower, and poorer separation efficiency.
Laboratory analysis is worth conducting. Also, those items that failed the tests earlier have not been released and are still circulating within the system; try to increase the amount of reflux, add more non-condensable gas, and if possible, increase the amount discharged outside as well!
Let the non-condensable gas out; open the line from the stabilizer tower top reflux tank to the condensed oil tank, and place it ahead. 1. The cooling load changes due to fluctuations in temperature or processing volume. Excessive absorption. 2. Don’t keep mentioning the bottom temperature; analyze how the top temperature of the tower changes 3. Has the pressure in the analysis tower changed significantly?
Two aspects: over-absorption, or insufficient desorption