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长期以来,在丙烷脱沥青的生产中,由于搞不准萃取塔底沥青-丙烷和脱沥青油-丙烷两溶液之间的密度差值的大小,塔底界面往往不能用仪表指示;即或能指示,也不能平稳地自动控制。一般是靠经常到现场在液口检查,随时调节塔底流量以控制界面。这样操作有以下缺点: 1.操作人员每班要多次到塔上去放液检查界
For a long time, in the production of propane deasphalting, the bottom interface often can not be indicated by the meter because of the difference in density between the extraction of the bottoms pitch-propane and the deasphalted oil-propane solution; that is, Indication, nor automatic smooth control. Generally rely on to the scene often in the liquid inspection, at any time to adjust the bottom of the flow control interface. This operation has the following disadvantages: 1. Operators to the tower to go to the tower several times to check the community