RU2438794C1 - Dust outburst locking device - Google Patents

Abstract

FIELD: process engineering. ^ SUBSTANCE: invention relates to electrical process equipment, particularly, to electro ionic process plants to be used in metallurgy, cement production, mining, etc. Proposed device consists of two electrodes, one of them making a corona-forming electrode. The latter is made up of concentrically arranged cylindrical rings made from thin metal strip. Note here that end faces of said rings are located in one plane parallel to corona-forming electrode plane representing of cutting-out screen with 2-5 mm-mesh. ^ EFFECT: higher efficiency of locking, simple servicing. ^ 2 dwg

Description

The invention relates to electrical installations, in particular to installations of electron-ion technology, and can be used to block and suppress dust flows, retain dust particles in the area of the source of dust during loading and unloading operations in the metallurgical, cement, mining and processing industries, and also in the production of building materials.

An analogue of the proposed technical solution is an electrostatic shutter, protected by RF patent No. 2283184, publ. September 10, 2006, bull. Number 25. The design of the analogue includes a system of cylindrical deposition and needle-shaped corona electrodes forming a comb and creating a volumetric electric charge in the interelectrode space. The electric field created in the interelectrode space, in this case, has a component parallel to the axis of symmetry of the device, which ensures directional movement of dust particles not only to the precipitation electrodes, but also in the direction of the return of the particles to the source of dusting. The disadvantage of this design is that, due to the cylindrical shape of the precipitation electrodes, the cleaning speed decreases due to insufficient living cross-section of the shutter, in addition to the return of particles to the dust source, particles also precipitate on the precipitation electrodes.

The closest technical solution of the proposed device is a design protected by patent No. 2343985, publ. 01/20/2009, bull. No. 2. In this device, the precipitation electrode is a metal mesh, and the corona electrode is a system of needle electrodes located along one line. The disadvantage of this device is also the low cleaning rate due to a decrease in the living cross section of the device, since the space charge is created by a linear corona electrode, which reduces the blocking efficiency.

The authors were faced with the task of increasing the efficiency of blocking dust emissions by increasing the living section of the blocking device, as well as simplifying the maintenance of the device.

This problem is solved in that the corona electrode is made in the form of concentrically arranged cylindrical rings of metal tape with a thickness of not more than 1 mm, the ends of which are located in the same plane, and another shape-forming electrode is installed under them in the form of a grooved mesh with cells of 2-5 mm.

The distance between the corona and forming electrodes is selected so that corona and filling the gap with a space charge are provided.

For each installation, this distance is selected experimentally: there should be no "breakdown", but a corona discharge should be formed.

The dimensions of the corona and forming electrodes are selected so that they completely overlap the blocked dust stream. The distance between the electrodes is equal to the gap between the rings of the corona electrode.

The forming electrode is connected to the positive electrode of the power source, and the voltage of the source is set to such a value that ensures stable crowning of the rings. The corona electrode is connected to the negative pole of the high voltage source.

The essence of the foregoing is illustrated by drawings, where

figure 1 is a front view of the device, and figure 2 is a top view of the device.

The proposed device for blocking dust emissions consists of a flat grid forming electrode 1, the plane of which is perpendicular to the direction of movement of the dust stream. The purpose of the forming electrode 1 is to create the necessary configuration in the interelectrode space of the electric field. In parallel with the plane of the forming electrode 1, a corona electrode 2 is installed, made in the form of several concentrically arranged cylindrical rings 3 of a metal tape with a thickness of not more than 1 mm, the ends of these rings 3 are located in the same plane. This ensures the corona ends of the rings when applying high voltage. The implementation of the corona electrode 2 in the form of concentric rings 3 provides greater overlap of the forming electrode 1 by the corona 2, while increasing the live section of the corona space charge of the device, therefore, its efficiency and productivity. The rings 3 are arranged in such a way that the ends of the rings are in the same plane and parallel to the plane of the forming electrode 1 and at the same time perpendicular to the direction of the dust flow. The dust stream first passes through the mesh forming electrode 1, and then through the rings 3 of the corona electrode 2. The rings 3 are electrically isolated from the forming electrode 1 and the device housing by means of high-voltage insulators (not shown in the drawing).

A device for blocking dust emissions is as follows.

The electric potential difference is applied to the forming 1 and the corona 2 electrodes and a region of the volume corona electric charge is formed around the corona electrode. The area of the bulk corona electric charge in this design fills the entire interelectrode space. Dust particles passing through a positively charged forming grid electrode 1 adsorb negative electric charges on themselves and begin to experience electrostatic forces from the electric field. Electrostatic forces are directed towards the movement of dust particles (counter to the direction of flow). With the correct choice of the geometry of the interelectrode space during the time a dust particle is in it, it manages to acquire a negative charge, under the influence of electrostatic forces pass through a grid shaped electrode 1 and return to the source of dusting. In this case, dust particles are not deposited on the forming grid electrode, which means that there is no need to clean the electrode.

For the forming grid electrode, a perforated grid is used, because the wicker mesh quickly clogs and the live section of the device decreases. When the mesh size of the expanded mesh is less than 2 mm, it can also become clogged with dust. When the mesh cell size is more than 5 mm, the efficiency of blocking dust emissions is reduced.

Thus, the device acquires the function of a shutter located in the path of moving dust streams, and blocks their release into the environment.

The proposed device is manufactured and tested in the conditions of the pilot production of NPP VNIKO LLC. The results showed high efficiency in blocking dust flow.

Based on the foregoing and taking into account the patent information search, we believe that our device meets the criteria for inventions and can be protected by a patent of the Russian Federation.

Claims (1)

A dust emission blocking device, consisting of two electrodes, one of which is a corona electrode, characterized in that the corona electrode is made in the form of concentrically arranged cylindrical rings of thin metal tape, while their ends are located in one plane parallel to the plane of the forming electrode, made in the form perforated mesh with 2-5 mm cells.

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