A tubular compact electrostatic coalescer for w/o emulsion electric field demulsification

Abstract

The invention relates to an inline compact electrostatic coalescer used for electric field demulsification of a W / O type emulsification liquid. The electrostatic coalescer comprises a tubular shell, an insulating sleeve coaxially nested in the tubular shell, a front end cover and a rear end cover separately connected to two ends of the tubular shell, a central shaft arranged on the central axis ofthe inner cavity of the insulating sleeve, a high-voltage electrode connection terminal connected to one end, facing to the front end cover, of the central shaft, high-voltage electrode spiral bladesarranged in the insulating sleeve and connected to the high-voltage electrode connection terminal, a grounding electrode connection terminal connected to one end, facing to the rear end cover, of thecentral shaft and grounding electrode spiral blades arranged in the insulating sleeve and connected to the grounding electrode connection terminal; the front end cover is provided with an emulsification liquid inlet and a high-voltage pole leading out port; the rear end cover is provided with an emulsification liquid outlet and a grounding pole leading out port; and the insulating sleeve, the central shaft, the high-voltage electrode spiral blades and the grounding electrode spiral blades form a spiral electrode flow channel.

Description

technical field [0001] The invention belongs to the technical field of electric field demulsification and dehydration of water-in-oil (W / O) emulsions such as crude oil, and in particular relates to a tubular compact electrostatic coalescer for electric field demulsification of W / O emulsions. Background technique [0002] Since the 1960s, electric field demulsification technology has gradually been widely used in the demulsification and dehydration of W / O emulsion represented by crude oil emulsion. Chamber type and other traditional electric dehydrator or electric desalter. Since the outer surface of the metal electrode is exposed, and it is generally used together with power frequency / high voltage sine wave AC electric field or high voltage DC electric field for electrostatic coalescence demulsification, not only the demulsification efficiency is low, but also when the inlet W / O emulsion conductance When the dehydration rate is too high, it is very easy to cause the phenome...

AI Technical Summary

Problems solved by technology

However, the above-mentioned compact electrostatic coalescer (CEC) has the following disadvantages: ①The structure of the annular channel prevents the promotion of the collision and coalescence of dispersed phase water particles in the W / O emulsion by proper hydraulic flow conditions, resulting in There is still a lot of room for improvement in demulsification and coalescence efficiency; ②The vertical pressure vessel structure of the multi-layer sleeve makes it still relatively large in engineering applications and still not compact enough, which needs further improvement

However, the tubular electrostatic coalescer (IEC) has the following disadvantages: ①The parallel plate flow channel structure adopted is difficult to actively and effectively promote the collision and coalescence of dispersed phase water particles; ②It is limited by the installation of plate-type high-voltage electrodes Form, so that the area utilization rate of the flow channel is low, and the processing capacity is small

But objectively speaking, although this structural scheme has improved the hydraulic flow conditions of the emulsion under the action of an electric field to a certain extent, the structure of the vertical pressure vessel with a multi-layer sleeve has not been fundamentally changed. The difficulty of processing, manufacturing and fixing installation of large and small spiral blades also increases accordingly, and it still cannot be called a tubular compact structure scheme

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