RESEARCH OF ELECTROSTATIC DEMULSIFICATION TECHNOLOGY UNDER HIGH-FREQUENCY/HIGH-VOLTAGE PULSED AC ELECTRIC FIELD AND ITS APPLICATION IN CRUDE OIL DESALTING

Abstract

Abstract: Electric desalting pretreatment of low-quality crude oil is a difficult technology generally faced by refineries. This paper introduces the development process of demulsification technology of crude oil emulsion electric field in the world, and points out that the high frequency / high voltage pulse electric field should arouse the attention of the domestic industry. The laboratory feasibility experiments and industrial side-line tests indicate that the demulsification performance of high-frequency/high-voltage pulsed AC electric field with square wave is better than that of conventional frequency/high-voltage AC electric field, where the optimum frequency depends on the physicochemical properties of specific water-in-crude-oil emulsions, e.g. water content, emulsification degree, and demulsification temperature, and is generally above 1500 Hz. The field test results of home-made BIPTHFAC-III high-frequency/high-voltage pulsed AC electric power with square wave show that the desalting efficiencies within the range of optimum electrical-field frequency are all higher than the average desalting efficiencies of the simultaneous reference samples, and it can shorten the hydraulic residence time and reduce the heating cost. The high-frequency/high-voltage pulsed AC electric field electrostatic demulsification technology can provide a practical and feasible scheme for solving the difficulty of low-quality crude oil desalting.

Key words: crude oil emulsion, electrostatic demulsification, electric desalter, high-frequency pulsed AC electric field, desalting efficiency

CLC Number:

References

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