Desalting system and crude oil desalting method
A technology for desalting crude oil and desalting, which is applied in the desalting system and the field of crude oil desalting, can solve the problems of poor desalination effect of inferior heavy oil and the like
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Embodiment 1
[0082] The density of some inferior heavy oil is 968.4kg / m 3 (20°C), API degree is 13.6, kinematic viscosity at 50°C is 584.3mm 2 / s, kinematic viscosity at 80°C is 90.72mm 2 / s; the freezing point is -16°C, the acid value is 5.43mgKOH / g, the wax content is 2.8m%, the sulfur content is 1680μg / g, the colloid and asphaltene are 18.53m% and 3.5m%, and the salt content is 8.6 mgNaCl / L.
[0083] This kind of crude oil is subjected to atmospheric distillation and vacuum distillation in turn. The processing capacity of the plant is 1.5 million tons per year. Vacuum wax oil is used as raw material for lubricating oil, and vacuum residue is used as road asphalt product. In the process, part of the distillate oil from the first line of normal pressure and first line of reduced pressure after heat exchange is mixed with inferior heavy oil at a mass ratio of 5:95 before the inferior heavy oil enters the electric desalting device. At this time, the density of the mixed oil is 943.9kg / m ...
Embodiment 2
[0086] The density of a certain inferior heavy oil is 949.5kg / m 3 (20°C), API degree is 17.1, kinematic viscosity at 50°C is 228.1mm 2 / s, kinematic viscosity at 80°C is 49.19mm 2 / s; the freezing point is -24°C, the acid value is 1.63mgKOH / g, the wax content is 2.58m%, the sulfur content is 1680μg / g, the colloid and asphaltene are 11.58m% and 8.3m%, and the salt content is 184.3 mgNaCl / L.
[0087]This kind of crude oil is subjected to atmospheric and vacuum distillation, and the processing capacity of the device is 1 million tons per year, and the vacuum residue is used as the raw material for delayed coking. Part of the distillate oil from the second line of normal pressure, the third line of normal pressure and the first line of vacuum without heat exchange is mixed with inferior heavy oil at a mass ratio of 7:93 before entering the electric desalination device. And before the inferior heavy oil is mixed with the distillate oil, it goes through a heat exchange and a seco...
Embodiment 3
[0090] The crude oil is the same as that in Example 2. The crude oil is subjected to atmospheric and vacuum distillation, and the processing capacity of the device is 1 million tons per year, and the vacuum residue is used as a raw material for delayed coking. The difference is that the temperature after replacement is 150°C, and two-stage electric desalination is adopted. The operating conditions of electric desalination are 20 mg / kg crude oil of demulsifier, 8% water injection in the first stage, and 7% water injection in the second stage. The water injection is purified water. The pressure difference of the primary mixing valve is 50kPa, and the pressure difference of the secondary mixing valve is 50kPa. After the two-stage electric desalination, the salt content of the inferior heavy oil is 15mgNaCl / L, and the water content is 0.5%.
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