Purification method of crude oil and cleaning method of oil storage tank

Abstract

The invention discloses a purification method of crude oil and a cleaning method of an oil storage tank. The purification method of the crude oil comprises the following steps of demulsifying and mixing hot water and oil which is conveyed from the oil storage tank and contains the crude oil to form a mixture; primarily separating the mixture formed by demulsifying and mixing, and conveying the primarily-separated crude oil to a recovery oil tank; deeply separating the remaining mixture after the primary separation is finished, and conveying the separated crude oil to the recovery oil tank; finally separating the remaining mixture after the deep separation is finished, and conveying the separated crude oil to the recovery oil tank; separating the remaining mixture after the finial separation is finished to remove residues. According to the purification method and the cleaning method disclosed by the invention, when the oil storage tank is cleaned, the cleaning and the discharging of the residues at the bottom of the tank are realized, so that an oil storage space of the oil storage tank is increased, and the storage quality of the crude oil is improved.

Description

technical field [0001] The invention relates to oil storage technology, in particular to a crude oil purification method and an oil storage tank cleaning method. Background technique [0002] During storage, a small amount of mechanical impurities, sand, soil, heavy metal salts, and heavy oily components such as paraffin and asphaltene in crude oil will naturally deposit at the bottom of the tank due to poor specific gravity, forming a black and thick gel The material layer reduces the effective capacity of the oil storage tank and affects the normal use of the oil storage tank. Therefore, oil storage tanks need to check the corrosion of the bottom of the tank regularly, replace the anode protection, replace the seal, replace the coil, repair the storage tank accessories, and the sludge in the tank must be removed. According to the world practice, the cleaning period of petroleum storage tanks is 6-8 years. The standard for cleaning petroleum storage tanks in my country is ...

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Problems solved by technology

[0012] In view of this, the present invention provides a crude oil purification method and an oil storage tank cleaning method, so as to separate the moisture and impurities at the bottom of the oil storage tank when cleaning the oil storage tank, increase the oil storage space of the oil storage tank, and improve The quality of stored crude oil solves the problem that the existing technology cannot separate the water and impurities at the bottom of the oil storage tank, which affects the quality of crude oil, causing difficulty in crude oil transportation and frequent blockage of filters, and reduces the utilization rate of storage tanks and increases the number of cleanings of oil storage tanks and difficulty of cleaning

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