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The working principle of electric desalination is to inject water into crude oil and mix with demulsifier, the water-soluble inorganic salt in the crude oil is also dissolved in water, and then the oil-water separation is carried out in the electric desalination tank, and the separation of oil and water in the electric desalination tank is used and installed The electrode in the electrostatic tank generates a high-voltage electric field, which polarizes the tiny water droplets in the oil. Under the action of the electric field, these charged water droplets collide with each other and coalesce into larger water droplets. Under the action of gravity, the larger water droplets freely settle to static electricity. A water layer is formed at the bottom of the tank, and the water-soluble inorganic salts in the crude oil will settle to the bottom of the electrostatic tank along with the water and discharged with the water. The larger solid particles can also quickly settle to the bottom to be separated. Part of the smaller solid particles (below 10µm) enters the water and settles.
Whether the electric desalination equipment can meet the required technical indicators after it is put into operation depends on the following seven factors: suitable strong electric field and weak electric field strength; suitable demulsifier and injection volume; suitable operating temperature; suitable water quality And water injection volume; suitable mixing intensity; suitable and stable oil-water interface; the rising speed Ws of the oil-water emulsion in the electric field.
The structure is simple, easy to install, and it is suitable for devices with small processing capacity and small tank size.
Compared with AC and DC electricity desalination and dehydration technology, it consumes a lot of electricity, and the utilization rate of the space in the tank is low.
High efficiency, low power consumption, wide range of adaptability to raw oil.
It is widely used in the desalination of crude oil in major refining and chemical companies.
The electric desalination tank is full of electric fields, and the utilization rate is high.
Due to the advection type of oil, the flow rate of crude oil in the electric field is high, so the dehydration efficiency is low.
It is suitable for a wide range of oil products and has high desalting and dehydration efficiency.
It has strong superiority when dealing with heavy oil products.
The tank is small and the crude oil processing capacity is large.
When expanding the capacity of the old device, the internal structure can be modified without changing the original tank to achieve a higher throughput.
Utilizing the previously unused space in the upper part of the electric desalination tank, an upper electric field composed of several sets of semi-closed disc electrodes is arranged, and the single electric field is changed to two unrelated low-speed electric fields on the upper and lower parts, which improves the original electric desalination. The space in the tank is used efficiently.