RU2701022C1 - Device for separation of gas fractions from oil-containing water - Google Patents

Abstract

FIELD: oil and gas industry.SUBSTANCE: invention relates to oil production and can be used for extraction of gas fractions from oil-containing water. Device for separation of gas fractions from oil-containing waters includes an electrolyzer in the form of a container with two flat electrodes immersed into it and a solenoid. Electrolytic cell is installed inside the solenoid. Electrodes are offset relative to each other in vertical direction.EFFECT: invention increases efficiency and reduces hydraulic resistance of equipment.1 cl, 4 dwg

Description

The invention relates to the field of oil production and can be used to isolate gas fractions from oil-containing waters by magnetohydrodynamic and electrophoretic methods.

A device is known for separating gas fractions from oily waters, for producing high-quality porcelain, for cleaning fruit juices, for separating emulsions in the oil industry, etc. (see the book Putilov K.A. Physics course. - T. 2: The doctrine of electricity, 5th edition. - M: Gostekhizdat, 1962. - P. 98-99), including a channel, at the ends of which electrodes are connected to DC power source.

A liquid with an oil emulsion placed in a channel undergoes electrophoretic separation, but the disadvantage is that the separation efficiency is low and there are large energy losses due to the release of gas inclusions.

A device for separating gas fractions from oily waters is also known (see A.S. USSR No. 1130534, M. Cl. C02F 1/46 Method for wastewater treatment from oily impurities // S.A. Sandakov, A.P. Vasiliev, V.P. Malkin, V.F. Korobko; Claim: 11/19/82; Publish. 12/23/84, Bull. No. 47) adopted for the prototype, which contains a laboratory unit, which is an electrolyzer in the form of a cylindrical container (d = 70 mm, h = 150 mm), with two aluminum flat electrodes immersed in it. To create a constant magnetic field with an induction vector perpendicular to the direction of the electric current, a solenoid with an internal diameter of 75 mm is used, into which an electrolyzer is installed.

The disadvantage of this device is the low productivity of the process, since the speed of the process is limited by the maximum permissible values of current density in the electrolyte and magnetic field strength in the core of the inductor, as well as an increase in hydraulic resistance during the process in the stream.

The objective (technical result) of the present invention is to increase the productivity of the process and reduce the hydraulic resistance of the equipment.

This object is achieved in that the device for separating gas fractions from oil-containing water, comprising an electrolyzer in the form of a container with two flat electrodes immersed in it and a solenoid inside which an electrolyzer is installed, the magnetic field induction vector is perpendicular to the direction of electric current and the electrodes are displaced one relatively another in the vertical direction, the electrodes occupy up to half the cross section of the ends of the channel, and at the entrance to the channel, the electrode is installed in its lower part, and and the exit is in its upper part.

In FIG. 1 shows a General view of the device with horizontal box-shaped electrodes mounted at the ends of the channel — axonometric projection; in FIG. 2 shows a general view of a device with continuous concave electrodes at the ends of the channel; in FIG. 3 shows a view of a device with a magnetic system in the form of a solenoid and with the direction of the electric field in the material across the direction of fluid motion; in FIG. 4 presents a vector diagram of the addition of forces acting on particles of suspension during operation of the proposed device.

The device (Fig. 1, 2) includes: a magnetic system with a core 1, a coil 2 and a working channel-slurry pipeline 3; an electrolyzer containing electrodes 4 (-), 5 (+), which are installed on the ends of the working channel-slurry pipeline 3; a device for loading the feedstock emulsion and a device 7 for removing electrolysis products. The electrodes occupy part of the surface of the ends of the channel, and the electrodes are offset in a vertical plane relative to each other so that the positive electrode is higher than the negative. According to the second option (Fig. 3), the coil 2 is coaxially wound on the slurry conduit-electrolyzer, the electrodes 4 and 5 are installed along the vertical longitudinal walls of the electrolyzer, the electrodes occupy part of the surface of the side walls of the pulp conduit-channel, and are offset relative to each other in a vertical plane so that the positive electrode is higher than the negative.

The device operates as follows. The device 6 is loaded with a feedstock - oil-containing water, which is a suspension of dispersed material in water or in an aqueous solution of salts, for example, a mixture of water, oil and gases dissolved in them, include an electromagnet 1 and apply voltage to the electrodes 4 and 5, and the electrodes are biased one relative to the other in the vertical direction and occupy part of the cross section of the ends of the channel. At the entrance to the channel, the electrode is installed in its lower part, and at the output in its upper part. Turn on the coil 2, which creates a magnetic flux in the core 1 in the gap between the poles of the core, the interaction of the magnetic field created by the coil 2, and the electric current passing between the electrodes 4 and 5. There is a quasi-gravity effect of the liquid and the dispersed particles and gases begin to quickly float up . In addition, the electric field vector will not be directed along or across the channel, but at an upward angle (Fig. 4), therefore, an additional force due to electrophoresis will appear, which will increase the rate of rise of particles and gas bubbles, and the separation rate, respectively. The dispersed material is divided into fractions in the device 7 for removing electrolysis products - smaller particles will float faster, since they have a higher value of the electrokinetic potential. In addition, it becomes possible to separate dissimilar materials having different values of the electrokinetic potential, but the same density; and reduce hydraulic resistance to the flow of the material to be separated due to the appearance of the axial component of the force of quasi-liquid tension. Fg is the hydrostatic pressure force; Fd is the Archimedean force; Ff - electrophoretic force; Fem - electromagnetic force.

When the device is operated with magnetic induction in the gap between the poles of the order of 0.8-1.0 T and the current density in the working channel is 100-150 A / m ² and the height difference between the positive and negative electrodes is 0.5 m, the process productivity increases by 15- 18%, and the decrease in hydraulic resistance is 10-12%.

Claims (2)

1. A device for separating gas fractions from oil-containing water, comprising an electrolyzer in the form of a container with two flat electrodes immersed in it and a solenoid inside which an electrolyzer is installed, the magnetic field induction vector of the solenoid being perpendicular to the direction of electric current, characterized in that the electrodes are offset one relative to another in the vertical direction. 2. The device according to p. 1, characterized in that the electrodes occupy up to half the cross section of the ends of the channel, and at the entrance to the channel, the electrode is installed in its lower part, and at the output in its upper part.

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