How to adjust when there is no level in the primary oil collection tank of the vacuum distillation tower
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The negative pressure in the vacuum tower is -98 kPa; there is no liquid level in line 1, the circulation volume in the top section is low with no reflux, and the temperature and pressure at the top cannot be reduced. The flow rates in lines 2 and 3 are within normal ranges. What measures can be taken to increase the liquid level in line 1?
Methods: 1. Increase the bottom temperature of the tower； 2. Increase the top reflux
Reduce mid-section reflux and shift the load to the upper part.
If it’s really not possible to establish a backflow reduction at the source, then an external backflow path must be created first.
From heavy fuel, or by reducing two crossings, provide a reduction of one dozen for reflux
The external return flow is introduced and then continuously cycled; mainly, the product gas at the top of the tower vaporizes and enters the condensation system
One approach is to reduce the backflow at the second stage as mentioned above, increase the furnace temperature; alternatively, it is also possible to lower the temperature of the atmospheric pressure furnace or reduce the amount sent to the fourth stage. The fourth stage stripping tower operates at full capacity, with the overflow going to the slag tank before proceeding to the vacuum distillation tower. The methods above can be tried occasionally.