Issues with the commissioning of propane deasphalting
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This post was last edited by reelove on 2016-1-31 at 21:08. The pressure is 4.2 MPA; the settlement tower is controlled at 95–98°C, the critical tower at 96–100°C, while the evaporation tower can only be maintained at 120–150°C due to load constraints. Propane startup sequence: Start with propane circulation before adding oil, gradually establishing the level; once liquid levels begin to form in each tower, then reduce the flow rate. During this period, both temperature and pressure will fluctuate; stabilize the pressure first, and then gradually bring the temperature within the specified range. Due to the inaccuracy of remote transmitters, it is necessary to rely on on-site level gauges to determine the liquid levels in each tower. The entire system started operating in the morning and functioned fairly smoothly. However, after 6 hours, the liquid levels in the sedimentation tower and the critical tower rose rapidly and became uncontrollable. Final tower flooding (the boundary level is not visible). I would like to ask fellow sailors if anyone has any information or experience regarding the operation of propane systems; also, please analyze the reasons behind tower flooding in cases of sinking towers and critical towers.
Changes in raw materials； Instrument failure ； Solvent with oil ； Low solvent ratio ；
During the material feeding process, it is necessary to maintain stable temperature and pressure; fluctuations in temperature and pressure will certainly lead to instability as well
The remote-level measurement is inaccurate, and the on-site level inspection was not thorough enough
Is 4.2 MPa the pressure in the extraction tower under high pressure conditions? Is it on the low side? “Don’t start the circulation and feed oil at first; gradually establish the liquid level. Only after the liquid levels in each tower have been established should the flow rate be reduced. Why not establish the propane circulation first before introducing oil?