DE1265713B - Precipitation electrodes for electrostatic wet separators consisting of individual strip-shaped elements - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

BOId

German class: 12 e-5

Number: 1265 713

File number: M 56816III / 12 e

Filing date: May 14, 1963

Open date: April 11, 1968

When cleaning plate-shaped collecting electrodes in wet dust collectors, large residual dust deposits that cannot be removed by tapping and rinsing cause considerable difficulties. Over time, these approaches become so thick that they interfere with the normal operation of an electrostatic dust collector system. This means that the system has to be taken out of service. The electrode plates are then scraped off by hand. With certain types of dust, the approaches are sometimes so hard that they can only be removed by sandblasting. In conventional systems, the electrode surfaces to be cleaned are between 100 and 2500 m ² per electrostatic dust extractor. The cleaning work in the manner described above is therefore very time consuming and costly.

Precipitation electrodes are known, for example from French patent specification 1014 926, which are formed from metal strips and one located on their lower part in the manner of an endless belt Run through the dust collection container for cleaning. The electrode bands are here in the brushed off in the usual way and the dust falling into the container is discharged by means of a screw.

However, practice has shown that cleaning of this type is not fully satisfactory because the initially the difficulties described occur. The same applies to a series of ribbon-shaped electrodes, be it that they are used as endless belts perpendicular to the direction of the gas with a filter effect, such as they are, for example, in US Pat. No. 2,535,697, British Pat. No. 794,038, and Swiss Pat Patent specification 96 319 and German patent specification 461293 are described, or be it, that they form gas gasses, for example from wet canvas, as in German Patent 339 879 described, find application.

The subject of the invention is a plate-shaped precipitation electrode, which neither by scratching is still cleaned by hand by sandblasting, but when it is after a certain period of operation Has lugs, removed and replaced with a new electrode.

The invention proposes a precipitation electrode consisting of strip-shaped individual elements for electrostatic wet separators with separating surfaces running in the direction of the gas and forming parallel gas paths, in which the length of the individual strip elements is a multiple of the electrode height and the excess length is rolled up on rolls, the individual elements being made from thin layers strip-shaped individual elements
existing collecting electrodes for
electrostatic wet separators

Applicant:

Metallgesellschaft Aktiengesellschaft,

6000 Frankfurt, Reuterweg 14

Named as inventor:

Jean Wiemer, 6376 Oberhöchstadt;

Kurt Rau, 6000 Frankfurt

There are metal foil and the rollers in the upper part of the separator outside the electrical Spray field, but within the spray zone, are hung next to each other at the front.

Metal foils with a thickness of approximately 0.6 to 0.05 mm are selected, which are exchangeable.

If one compares the price of conventional massive Precipitation electrode plates with the price for, for example, 0.3 mm thick aluminum foils, it can be seen that the foils can be exchanged six to ten times without additional costs, which is a considerable advance when one considers that the massive collecting electrode plates are severely subject to wear from frequent sandblasting are exposed.

In order to achieve sufficient tension in the metal foil strips, according to the invention, the the rollers bearing axles are arranged pawls and the metal foils on both the top and the top guided at the lower end of the precipitation field and at its lower end by weights or spring forces burdened.

The invention is explained in more detail using an exemplary embodiment:

The figure shows a schematic longitudinal section through an electrostatic wet separator. The gas to be cleaned enters the electrostatic wet separator through the raw gas nozzle 1 and flows between the precipitation fields, consisting of the spray frame 2 with the spray electrodes 3 and the plate-shaped precipitation electrodes, consisting of strip-shaped individual elements 4 in the form of metal foils, upwards and leaves through the Clean gas nozzle 5 the electrostatic wet separator. The nozzles 6 ensure constant irrigation, while the nozzles 7 are provided for flushing the arrangement. The separated dust

809 538/466

is collected in bunker 8. The metal foil rolls are denoted by 9. The collecting electrode strips 4 are guided by devices 10 and 11 and either by weights 12 or springs 13 tensioned.

Claims (2)

Patent claims: 1. Electrostatic precipitation electrode consisting of strip-shaped individual elements Wet separator with separation surfaces running in the gas direction and forming parallel gas paths, the length of the strip elements being a multiple of the electrode height and the excess length being wound up on rollers is, characterized in that the individual elements (4) consist of thin metal foil and that the rollers (9) in the upper part of the separator outside the electrical spray field, but within the spraying zone, are hung next to each other at the front. 2. Precipitation electrode according to claim 1, characterized in that »pawls are arranged on the axles carrying the rollers (9) and the metal foil strips are guided both at the top and at the bottom of the precipitation field and are loaded by weights (12) or spring forces at their lower end . Considered publications:
German Patent Nos. 461293, 1,053,154; Swiss Patent No. 96 319;
French Patent No. 1,014,926;
British Patent Nos. 794 038, 826 213;
U.S. Patent Papers No. 2,535,697, 2,579,440. 1 sheet of drawings 809 538/466 4.68 © Bundesdruclcerei Berlin