What is the electric desalting oil rejection procedure when the atmospheric and vacuum distillation unit is shut down?

When the atmospheric and vacuum distillation unit is shut down, what is the best time to drain oil from the electrodesalination system? Generally, it is better to drain it earlier; if the temperature is too low, the viscosity of the oil may increase, making it difficult to drain it. However, the decision should also be based on the actual conditions of the oil drainage pump. If the temperature is too high, it can cause the pump to become vacuumed, and a slightly higher temperature, as long as it ensures proper operation of the pump, can help reduce the difficulties associated with oil drainage! Is steam or nitrogen better for pressurization? (For electrodialysis tank units without an oil return pump but with nitrogen filling lines)？ Generally, steam is used for filling. In our facility, since the nitrogen generation system is relatively small, it’s quite difficult to fill it with nitrogen; that’s why steam is used instead. I’ve never seen it being filled with nitrogen either. Actually, there’s nothing wrong with using nitrogen either – the functions of the two are basically the same! Still, make sure the temperature doesn’t drop too quickly! Precautions: Do not exceed the pressure limit. Before removing the oil, ensure that all water is removed first; it is best to carry out several backwash cycles using electrodesalination in order to flush out the salts from the bottom of the electrodesalination tank. This prevents excessive impurities in the oil from causing blockages in the filters of the oil removal pump!

This post was last edited by crazymoonman on 2015-10-21 at 21:10. Electrodesionization for oil removal is generally started before shutting down the system; usually, one to two weeks in advance, the electrodesionization process is halted and the temperature is reduced. Depending on the temperature in the electrodesionization unit (which should ideally not exceed 60°C), an oil removal pump is used to transfer oil out of the tank area. If the electrodes in the electrodesionization unit have not been inspected or replaced, it is not advisable to use steam for pressurization or purging, as the high temperature of steam can cause the insulation to fail. In the past, we would first remove the oil; once a certain level of oil had been removed (with the pressure in the electrodesionization unit remaining above zero), we would open the vent line on top of the tank to continue removing the oil until it was completely gone. For treating the electrodesionization unit, washing with water is the main method, along with heating the bottom of the tank using a small amount of steam.

By \"consciousness\" does it mean to start cooling down in advance, to perform backwashing several times first, then release water, and finally begin the process of draining the water?