Seeking online treatment solutions for salt deposition in distillation columns of various plants

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1. Reduce the amount of fresh feed, lower the compressor load, and close the regeneration slide valve. 2. Adjust the heat removal load in the middle and lower sections of the distillation tower; enable cooling reflux at the top of the tower. While maintaining the temperature at the top of the distillation tower around 110°C, gradually reduce the amount of reflux flow. When the temperature of the diesel extracted is above 190°C, carry out water washing in accordance with the specified procedure, and progressively stop the reflux flow. 3. Slowly increase the amount of water supplied; stop increasing it once water begins to be discharged from the drain of the reflux pump. 4. Analyze the top circulation water sample every half hour to determine the total salt content in the water; washing should be stopped once the total salt content remains essentially constant. 5. After the water washing is complete, once the top circulation dehydration is finished, start the top circulation pump to resume top circulation, adjust the load on the fractionation tower, stop the cold reflux, resume reaction feeding, increase the speed of the air compressor, and restore the plant to normal operation.

We mainly use the water washing method. At first, we stopped the feed to the reaction vessel, sent the oil at the bottom of the splitter tower to the air, used a top circulation pump to inject water, and then pumped it to the storage tank via a stripping tower using a diesel pump for dehydration. Over time, we found a way to carry out this process without significantly affecting operations: we used one of the top circulation pumps to inject water while discharging it at the inlet of the other pump. The first method ensures thorough cleaning but is more complicated; the second method is simpler, but it requires careful control of the volume, and oil is lost during the removal of impurities. Regardless of the method used, it is important to stop injecting water once a significant drop in the temperature of the liquid drawn from the middle section is observed, as this indicates that there is too much water inside the tower. We use this method because salt accumulation in our facility mainly occurs between the point where diesel is drawn out and the point where liquid is drawn out via the top circulation system. If salt accumulation is detected above the point where liquid is drawn out via the top circulation system, then the cold reflux water injection method can also be used

Online water washing must be carried out at reduced rates; water is injected into the tower using a top circulation system, and the temperature at the top of the tower must be carefully controlled to prevent water from entering the lower sections of the distillation tower, which could lead to boiling in the reprocessing oil tanks and other accidents