A crude oil electric dehydration device and method with a DC superimposed AC pulsed electric field

Abstract

The invention relates to the technical field of high voltage application, in particular to a crude oil electric dehydration device and method of direct current superposition alternating current pulse type electric field. The device comprises an alternating current pulse high voltage power source, a direct current high voltage power source, and a crude oil electric dehydrator, wherein high voltage electrode plates and ground electrode plates are parallelly arranged, at certain intervals, in the crude oil electric dehydrator, and the alternating current pulse high voltage power source is electrically connected with a blocking capacitor and a protection resistor sequentially to form an alternating current pulse high voltage circuit, the direct current high voltage power source is electrically connected with a high voltage silicon stack and a protection resistor sequentially to form a direct current high voltage circuit, and the two high voltage circuits are both connected with the high voltage electrode plates through high voltage lead wires. The number of layers of the electrode plates in the crude oil electric dehydrator is few, the difficulty of inletting and arranging wiring is low, the volume of the electric dehydrator is small, a generated superimposed electric field can form an effective dehydration electric field in the whole cycle, and dehydration efficiency and electric energy utilization rate are high.

Description

technical field [0001] The invention relates to the technical field of high-voltage application, and is mainly used for the electric dehydration link in the crude oil transportation process, in particular to a crude oil electric dehydration device and method using DC superimposed AC pulse electric field. Background technique [0002] At present, the crude oil electric dehydration process mostly adopts the methods of AC electric field dehydration, DC electric field dehydration and AC-DC composite electric field dehydration. [0003] AC electric field dehydration is to directly add power frequency AC to the electrodes of the dehydrator after being boosted by a step-up transformer to form an electric field that changes according to the sinusoidal law. The required equipment is simple, the cost is low, and the adaptability to crude oil is strong. It will cause corrosion of equipment, and its disadvantage is that the effective utilization rate of electric energy is low. [0004]...

AI Technical Summary

Problems solved by technology

[0003] AC electric field dehydration is to directly add power frequency AC to the electrodes of the dehydrator after being boosted by a step-up transformer to form an electric field that changes according to the sinusoidal law. The required equipment is simple, the cost is low, and the adaptability to crude oil is strong. It will cause corrosion of equipment, and its disadvantage is that the effective utilization rate of electric energy is low

[0004] DC electric field dehydration is to rectify the AC voltage into a DC voltage, and then add it between two parallel electrode plates to form a DC electric field. The dehydration efficiency of the DC electric field is generally higher than that of the AC electric field, but it is easy to form a water chain between the electrode plates to dehydrate The electric field is unstable, and it is suitable for processing low-water crude oil that requires high dehydration quality, and the oil content in the dehydration water is high, and it will also cause electrochemical corrosion of the electric dehydration equipment;

[0005] The AC-DC composite electric field is a machine combination of the AC electric field and the DC electric field. The upper plate applies a DC electric field and the lower plate applies an AC electric field to improve the treatment efficiency of the crude oil emulsion. However, this method needs to be arranged in multiple layers in the dehydration container. electrode, which increases the volume of the dehydrator, and the process is complicated, and the bottom electrode often has the phenomenon of electric field collapse, and it is easy to lose the effect of the DC electric field when the electric field fluctuates, so it has not been put into practical use.

Images