Can’t reach the desired volume at the top?

It’s not necessarily the case; the salt formation phenomenon is mainly caused by fluctuations in the temperature in the middle part of the distillation tower as well as at the top. It’s difficult to control the quality of gasoline and diesel. The main reasons for the vacuum condition in the top circulation pump are: 1. Blockage of the filter at the inlet of the top circulation pump, 2. Presence of water inside the top circulation system

It’s not necessarily the case; the phenomenon of salt formation is mainly due to fluctuations in the temperature in the middle part of the distillation tower as well as at the top. It’s difficult to control the quality of gasoline and diesel. The main reasons for the vacuum condition in the top circulation pump are: 1. Blockage of the filter at the inlet of the top circulation pump, 2. Presence of water in the top circulation system. I agree with what was said above. However, salt formation does indeed cause the top circulation pump to become clogged. The initial symptom is a decrease in flow rate while the opening of the control valve remains unchanged; it is possible to observe a drop in pressure or severe fluctuations on the pressure gauge of the top circulation pump. If not addressed promptly, it will worsen and eventually lead to exhaustion. Salt formation is generally accompanied by fluctuations in the temperature at the middle and top of the fractionation tower; it is difficult to control the dry point of gasoline, and there are fluctuations in the extraction temperature of diesel as well as instability in the liquid level of the diesel stripping tower. The treatment method is washing with water. For washing, water can be injected behind the top circulation control valve, which makes it easier to control. When releasing water, you do it from behind the inlet valve of the top circulation pump on the other unit (you can add a 50 mm pipe at the filter). It should be noted that: 1. Use the pump inlet at the front to drain water. 2. Remember to wash the pump outlet as well when cleaning with water. 3. Control the water volume properly – it shouldn’t be too high, to avoid excessive fluctuations in operation or water flowing to the bottom of the tower; haha, that wouldn’t look good. 4. In fact, there’s no need to test for sodium ions; it’s sufficient to check the cleanliness of the water that is discharged. Generally, 4 hours of washing is enough. Think about the rest by yourself. Good luck to you.

Not necessarily. 1. Check the operation of the pump or switch to the backup pump ； 2. Check whether the cold reflux at the top of the tower contains water, and whether there is internal leakage in the overhead circulation stream used for line cleaning ； 3. Were there any instances of over-pressurization in previous operations? If production doesn’t increase for an extended period, it’s possible that the trays could come loose ； Another issue is salt formation in the fractionation tower.

The reasons for the inability to achieve sufficient throughput at the top of the column are: 1. Insufficient load on the top of the distillation column, or excessively low cut-off temperature and pressure. 2. Cold reflux carries water, causing water in the top zone. 3. The top temperature is too high, resulting in a decrease in the oil level in the oil collection tank of the top reflux extraction layer. 4. The temperature of the extracted top product is too low, resulting in water in the top product. 5. Salt formation in the distillation column. 6. Malfunction of pump instruments. Furthermore, if salt forms in the fractionation tower, it can cause severe overlap between gasoline and diesel, making it impossible to adjust the mixture; in cases of severe salt formation, light diesel cannot be extracted.

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The flow rate at the top cannot be increased; if the flow rate doesn’t increase even when cold reflux is used, then it’s not a problem related to operation. Consider whether the tray is perforated. We have encountered it before. The liquid collection trays on the upper layers (especially the one at the extraction port) are punctured, and in any case the system will become empty. It was fixed after a maintenance check later on. If the equipment is fine, then analyze based on the properties of the crude oil and the operating conditions to determine whether salt deposition has occurred.

Not necessarily; it could also be due to an excessively low temperature in the top of the reflux tower, which leads to water carryover and evacuation, or too high pressure in the middle and lower parts of the tower, resulting in too low a load at the top. It might also be caused by a fault with the pump itself. The 3rd floor also covers this in quite detail. When it is difficult to control the quality of gasoline and diesel, when there are frequent tower surges, and when light diesel cannot be extracted in severe cases, once other factors have been ruled out, it is possible to determine whether salt deposition is the cause.

It’s not necessarily all due to salt formation; it has a lot to do with the operating conditions. You should check your design documents to see what the temperature and flow rate are in the top circulation section, and compare them with the actual conditions. It’s possible that the operating temperature is insufficient or the amount of top circulation is not enough, which can lead to vacuum formation! Also, it’s necessary to calculate whether vacuum formation actually occurs under the current processing volume and operating conditions!