RU2205681C2 - Device for mixing immiscible liquids - Google Patents

Abstract

FIELD: liquid mixing apparatus; microbiological, chemical, petrochemical, food-processing, fuel and other industries. SUBSTANCE: proposed device has reservoir filled with dispersed medium. Dispersed phase supply system is provided with capillary tube for drop delivery of liquid which is immersed in dispersed medium. Electrode system located inside reservoir filled with dispersed medium is made in form of parallel blade-shaped current- carrying plates arranged vertically in rows connected with different poles of voltage source by rows. EFFECT: enhanced efficiency; reduced power requirements and usage of materials. 3 cl, 3 dwg

Description

 The proposed device relates to apparatus for mixing liquid media and may find application in the mixing of immiscible or poorly miscible liquids in microbiological, chemical, petrochemical, food, fuel and other industries, as well as in scientific research.

 Known vibration mixing device containing a rod and mounted on it a mixing body, made in the form of a disk with holes (a. With. USSR 688212). The disadvantages of such a device are: the presence of mechanical components; design complexity; high material consumption; polydispersity of the resulting emulsion.

 A device for producing an emulsion is known, comprising a nozzle block, nozzles for supplying gas and liquid, a casing with a subsonic nozzle, and an autonomous gas source (A.S. USSR 1407524). The disadvantages of this device are: design complexity; high material consumption; the need for an autonomous gas source; polydispersity of the resulting emulsion.

 Closest in technical essence to the proposed device is a plant for preparing a water-fuel emulsion containing a fluid supply system, a system of electrodes connected to opposite poles of a constant voltage source (a.s. SU 1690828). The disadvantages of this installation are: the presence of a special mixer for mixing fuel with water and preliminary dispersion, a pump for feeding the emulsion into a special dispersant for final dispersion, and the complexity of the design.

 The purpose of the proposed technical solution is to simplify the design by eliminating a mixer for mixing fuel with water and preliminary dispersion, a pump for feeding the emulsion to a special dispersant for final dispersion, increasing energy efficiency and providing the possibility of mixing immiscible or poorly miscible liquids with a high degree of monodispersity.

 This goal is achieved by the fact that in the device containing the high voltage source, the fluid supply system, the electrode system is made in the form of vertically arranged two or more parallel parallel to each other blade-shaped conductive plates connected in sequence with the opposite poles of the voltage source, placed inside the tank, filled dielectric fluid, which is a dispersion medium, and the fluid supply system, which is a dispersed phase, contains a capillary tube female in capacity.

 Compared with the prototype, the proposed technical solution is characterized in that the device contains a capacitance filled with a dispersion medium, the electrode system is placed inside the specified capacitance and made in the form of vertically arranged two or more parallel parallel to each other blade-shaped conductive plates connected in sequence with unlike poles of the voltage source and the fluid supply system contains a capillary tube, with which the fluid flows in drops, the capillary being immersed in dispersed medium that meets the criterion of "novelty."

 The distinguished features with their functions are not identified in other technical solutions, which meets the criterion of "significant differences".

 A positive effect in the implementation of the proposed technical solution will be to obtain a monodisperse emulsion at low energy costs.

 The use of the proposed technical solution, that is, a device for mixing immiscible liquids, will improve the quality of the resulting emulsions with low material and energy consumption.

 A device for mixing immiscible liquids is shown schematically in figure 1. It contains a container (1) filled with a dielectric fluid, which serves as a dispersion medium, a fluid supply system (2) with a capillary tube (3), which is a dispersed phase, an electrode system (4) and an electric voltage source (5), the electrode system ( 4) is made in the form of vertically arranged two or more rows parallel to each other of blade-like conductive plates connected in sequence with unlike poles of the source.

 Structurally, as shown in figure 2, the electrode system can be installed, for example, in a frame made of dielectric material containing two plates: the upper (6) with through holes and the lower (7) with blind holes, blade electrodes are inserted into the holes (8), the plates are attached to the columns (9), guides (10) are installed between the plates to create a directed fluid flow.

 Figure 3 shows a possible design of the blade electrode. A thin metal plate, a blade (2), the sharp edge of which is brought out, is inserted into a tube (1) made of dielectric material, cut lengthwise, with a blunt end. The plate is fixed in the tube with rings (3) of dielectric material.

 The operation of the device is based on the use of the electrohydrodynamic effect, which studies the motion of liquid dielectrics in an electric field. The essence of this EHD effect is that the presence of an inhomogeneous electric field in a liquid dielectric causes the appearance of the so-called "ponderomotive" forces, which lead to the appearance of locally convective acceleration of elementary volumes of a liquid medium, which results in the appearance of convective flows of a liquid dielectric in the interelectrode space ( see Tamm I. V. Fundamentals of the theory of electricity. - M .: Nauka, 1976; Nagorny BC Electrofluid converters. -Leningrad: Shipbuilding, 1987).

 In the proposed device, the EHD effect is used as follows. In a container (1) with a dielectric fluid (for example, transformer oil) using a fluid supply system (2) containing a capillary tube (3) immersed in a dispersion medium, a dispersed phase (for example, water) is supplied dropwise. Under the action of the voltage supplied to the electrode system (4), from the source (5), a strong sharply inhomogeneous electric field arises, leading to the appearance of a convective flow of dielectric fluid from the tip of the blade electrodes. The flow of dielectric fluid is accelerated in an electric field, carries water droplets into the guide channel, where they are dispersed under the influence of an electric field and the subsequent mixing of the components in the tank. The sequential placement of the blade electrodes in rows leads to an increase in the force EHD effect on the dielectric fluid.

Thus, the technical and economic advantages of the invention over analogues are as follows:
1) Lack of mechanical components;
2) The simplicity of the design of the device;
3) The possibility of mixing immiscible or poorly miscible liquids and subsequent dispersion of the dispersed phase, that is, to obtain an emulsion.

Claims (3)

 1. A device for mixing immiscible liquids containing a liquid dispersed phase supply system, an electrode system, an electric voltage source and a container filled with a dispersion medium, characterized in that the dispersed phase supply system is provided with a capillary tube for dropping a liquid supply immersed in a dispersion medium, and the electrode system is placed inside a container with a dispersion medium and is made in the form of blade-shaped currents vertically arranged in two or more rows parallel to each other rovodyaschih plates connected to opposite poles poryadno source voltage.  2. The device according to claim 1, characterized in that the electrodes of each row are staggered relative to the electrodes of adjacent rows.  3. The device according to p. 1 or 2, characterized in that the electrode system is limited by the guide surfaces for directing the fluid flow.

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