A process for electric desalting of high-acid crude oil

Abstract

The invention relates to a high-acid crude oil electro-desalting process, and especially relates to the combined process with a magnetoelectric demulsification device and electro-desalting tanks combined and for oily waste water and an emulsion layer outboiler treatment. The process is mainly characterized in that the magnetoelectric demulsification device is mounted at the rear of a mixing valve and in front of an electrical desalting system, and the electro-desalting current can be reduced, so as to reduce energy consumption and improve the adaptability and stability of the device; a final-level electro-desalting tank is injected with water, desalted water and an emulsion layer of a next-level electro-desalting tank are re-injected to a former-level electro-desalting tank, and oily waste water and an emulsion layer discharged by a first-level electro-desalting tank is subjected to outboiler oil removal treatment; a magnetic anti-scaling device is mounted on a water draining pipeline, so that drained water of the next-level electro-desalting tank is qualified without considering a case of dehydration and oil containing but only considering a case of water containing and salt containing after removal. The process can reduce electricity consumption, improve the desalting efficiency, increase the removal rate of metal ions, reduce the volume of the desalting tanks, improve the device applicability and reduce operating fluctuation.

Description

technical field [0001] The invention relates to a process for electric desalting of high-acid crude oil, in particular to a process for combining a magnetic-electric demulsifier with an electric desalting tank, and treating oily sewage and an emulsified layer outside the tank. [0002] In addition to being used for desalting and dehydrating high-acid crude oil, the invention can also be used for dehydrating and desalting various crude oils, production fluids, refined oils and fuel oils. Background technique [0003] With the continuous deepening of crude oil exploitation, the proportion of high-acid crude oil continues to increase, mainly from Sudan, Brazil, Venezuela, Angola and other countries. At the same time, China's Shengli crude oil, Xinjiang, Bohai Bay and Liaohe oil also have high acid values. According to statistics, the global output of high-acid crude oil has exceeded 400 million tons, accounting for more than 10% of the total output of crude oil; Natural emulsi...

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Problems solved by technology

[0010] In order to solve the desalination and dehydration problem of high-acid crude oil, the present invention proposes an overall solution, mainly considering the first-level electric desalination drainage and the oil removal outside the emulsified layer tank. It is enough to build a set of oil removal facilities, which can avoid the electric desalination tanks at all levels. The impact of different drainage pressures on operation; the drainage and emulsified layer of the latter stage of electric desalination tank are all reinjected into the previous stage, so the latter stage of electric desalination tank only considers the salt content after desalination and does not need to consider the oil content of drainage, so the oil-water interface can be control in lower position

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