RU2535863C1 - Mixer-electrocoalescentre - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to mixers-electrocoalescentres and can be used to make water-oil emulsions at oil electrical desalting plants. Proposed device is composed of vertical earthed Venturi tube housing with electrode aligned therewith. Water feed nozzle is arranged at the bottom in housing axis. Variable electric field inside said chamber is induced between central rod electrode and Venturi tube mixing chamber walls. Nozzle counter electrode is composed by Venturi tube confuser part. Voltage to electrode and nozzle is fed via current conductors and bushing from step-up transformer.

EFFECT: higher efficiency of coalescence.

1 dwg

Description

The mixer-electrocoalescentor refers to devices for mixing oil with water during its desalination and for processing a water-oil emulsion in an electric field and can be used at enterprises of the oil and gas complex, mainly for oil desalination and dehydration processes.

The well-known "Apparatus for desalting oil emulsions" [and.with. 1101255 (USSR), class B01B 17/06, publ. in BI 1984, No. 25, Yu.N. Shvetsov, A.A. Yunusov, A.K. Mukhametzyanov, G.M. Akhmadiev, M.A. Takhauov, S.Sh. Gershuni, V.A. Lukyanov], according to which it is equipped with a device for electro-spraying washing water into oil.

The disadvantage is that the electrodes are located across the stream and the hydrodynamics of the oil-water emulsion for dispersing liquids are not fully used in the proposed design.

Of the known closest in technical essence is the "Device for the electrical treatment of oil-water emulsions" [AS 1058576 (USSR), cl. B01B 17/06, publ. in BI 1983, No. 45, S.Sh. Gershuni, A.V. Gribanov, E.Ya. Lapiga, V.I. Loginov, S.M. Melnikov], including a cylindrical body in which an electrode is installed in the form of a pipe segment and an emulsion nozzle located on the side of one of the ends of the electrode.

The disadvantage of the device, taken as a prototype, is that in the proposed design in one housing two processes of creation and destruction of an emulsion of water in oil are combined, requiring opposite conditions for their implementation.

The technical result of the proposed device is the possibility of combining in one housing two processes that are close in terms of conditions: the creation of an emulsion and the destruction of adsorption shells on water drops by electric fields. In addition, the directed flow of working fluid flows prevents the formation of structures from water droplets, leading to a short circuit of the electrodes.

This is achieved by the fact that in the mixer-electrocoalescentor, including a vertical grounded housing, coaxially to which the electrode is placed, in the lower part, a nozzle for supplying water is placed along the axis of the housing. The walls of the mixing nozzles are energized and are an external electrode with respect to the nozzles that enter into these nozzles. The voltage to the electrode is supplied through a current-carrying cable and a bushing from a step-up transformer, according to the invention, the housing is made in the form of a venturi. An alternating electric field inside the housing is created between the central rod electrode and the walls of the mixing chamber of the venturi, as well as between the nozzle and the confused part of the venturi. Thus, a device for electro-spraying washing water into oil is implemented.

The introduction of new elements and the relationships between them provides a solution to the problem.

The removal of the stage of separation of the emulsion from the apparatus can significantly reduce the size.

The use of a Venturi pipe instead of a pipe segment allows the use of hydrodynamic effects in the confuser and diffuser parts and to obtain the same result with less energy.

The process of electro-spraying washing water into oil is organized between the nozzle and the confused grounded part of the venturi, which prevents the formation of structures from water droplets, leading to a short circuit of the electrodes.

Figure 1 schematically shows a General view of the mixer-electrocoalescent.

The mixer-electrocoalescentor (figure 1) contains:

1 - nozzle of the mixer;

2 - current-carrying cables;

3 - fitting with a bushing;

4 - pipe of non-conductive material;

5 - pipe input water-oil emulsion;

6 - fitting fitting water inlet pipe;

7 - water inlet pipe;

8 - coupling;

9 - confuser;

10 - mixing chamber;

11 - rod electrode;

12 - diffuser.

At the same time, the mixer-electrocoalescentor is assembled in a vertical casing made in the form of a Venturi pipe and is grounded. A rod electrode 11 is placed along the axis of the mixing chamber 10. A field inside the casing, acting as an electrocoalescent, is created between the rod electrode 11 and the walls of the mixing chamber 10 of the venturi. The nozzle of the mixer 1 for supplying water is placed coaxially with the body, under the confuser 9 of the venturi and voltage is supplied to it from a step-up transformer. The nozzle counter electrode is the confuser 9 of the grounded housing. The nozzle is mounted through the fitting of the water inlet nozzle 6. The metal nozzle of the mixer 1 is mounted on a pipe segment of non-conductive material 4, which, in turn, is fixed on the water inlet nozzle 7 through a coupling 8. The initial oil-water emulsion enters through the oil-water emulsion inlet port 5. The voltage to the rod electrode 11 and the nozzle of the mixer 1 is supplied through current-carrying cables 2 and the cover of the fitting with a bushing 3 from the step-up transformer.

The mixer-electrocoalescentor works as follows. The initial oil-water emulsion is fed into the housing from the bottom up through the inlet port of the oil-water emulsion 5. The emulsion contains drops of salt water. 3-5% of water is finely dispersed by the forces of the electric field through the nozzle 1 into the stream. The process of merging fresh and salt water begins. In the confused part of the venturi, the speed increases and, under the action of pressure forces, droplets of different diameters move at different speeds. As a result, they collide and merge. The process is facilitated by an alternating electric field, which destroys the adsorption layers on the droplets. The process of destruction of the adsorption layers on the droplets and their merger is completed in the mixing chamber 10 of the venturi.

Using the proposed device can significantly intensify the process of electric desalting of oil.

Claims (1)

The mixer-electrocoalescentor, including a vertical grounded casing, coaxially to which the electrode is placed, a nozzle for supplying water is placed in the lower part along the casing axis, the voltage to the electrode is supplied through a current-carrying cable and a bushing from the step-up transformer, characterized in that the casing is made in the form of a venturi , an alternating electric field inside the housing is created between the central rod electrode and the walls of the mixing chamber of the Venturi pipe, as well as between the nozzle and the confuser part of the pipe Venturi.