Seeking help with electrodeionization current issues

It must be that the crude oil contains water or the level control is set too high. According to the characteristic curve of the electrodesalination transformer, as the current increases, the voltage decreases; the main reasons for this are ⑴ an excessively high water level. ⑵Excessive water content in crude oil or changes in the injection volume. ⑶ If the inlet temperature is too low, water cannot be removed. ⑷ The emulsion performs poorly and is of poor quality. ⑸ The mixed pressure difference is too high, causing the crude oil to emulsify. Handling method: (1) Check the water level and maintain a normal level. ⑵ Reduce or stabilize the water injection volume according to the situation. ⑶ Check the temperature inside the tank and adjust it promptly. ⑷ Contact to replace the demulsifier or increase stirring during preparation. ⑸ Appropriately reduce the mixing pressure difference.

If we are talking about sudden changes, it’s probably due to water in the crude oil. Whenever we change the crude oil tank or when the liquid level in the tank is low, we need to close the gate valve located in front of the electrodesalination safety valve. I keep the oil-water interface at a lower level, open some bypass lines, and raise the liquid level in the flash tower. When there is a drop in pressure and an increase in current, I reduce the processing volume. If it’s possible to switch tanks, then we do so; if no alternative tanks are available, we fully activate the electrodesalination system. The processing volume is determined by the pressures in the flash tower and the atmospheric tower, and efforts are made to remove water from the crude oil tanks

This post was last edited by Qiushui Pingchuan on 2011-6-16 at 17:53. I assume that the oil-water interface level is relatively high; at the same grade, the higher the oil-water interface level, the stronger the alternating weak electric field, but this will result in a weaker direct current strong electric field. At 16 kV, the alternating-current weak electric field has a certain dehydrating effect. When it is adjusted to level V at 13 kV, the alternating-current weak electric field weakens, and its dehydrating effect decreases; as a result, more water enters the direct-current strong electric field, leading to a decrease in voltage but an increase in current. This is just one possibility, for discussion only.

That's how it is. It’s definitely not for the reasons mentioned by the people above. We’ll skip this as well: the higher the voltage supplied by the transformer, the lower the current; the lower the voltage, the higher the current. Think about it: the current in electrodialysis is determined by the conductivity of the crude oil. As the electric field strength decreases, the dehydration rate decreases relatively, the distribution density of water in the oil increases, and the current generally rises.