DE202017100505U1 - Earthing conductors and their use in wet electrostatic precipitators - Google Patents

Abstract

Grounding conductor for a wet electrostatic precipitator, which are guided by a Abscheidderohrbündel the wet electrostatic precipitator to a grounding system, wherein the grounding conductors each comprise a highly electrically conductive core and a core sheathing and this protective against mechanical and chemical attack plastic sheath, characterized in that the electric good conductive core sheathing plastic covering of an electrically conductive plastic, an electrically conductive resin or an electrically conductive paint.

Description

Technical area

The invention relates to a grounding conductor for a wet electrostatic precipitator, which are guided by a Abscheidereerbündel the wet electrostatic precipitator to a grounding system, wherein the grounding conductors each comprise a highly electrically conductive core and the core sheathing and this protective against mechanical and chemical attack plastic sheath.

State of the art

Wet electrostatic precipitators usually consist of a bundle of precipitation tubes, which are preferably made of plastic and have a centrally suspended spray electrode in the middle.

This plant is used for the separation of solid, liquid and / or gaseous pollutant components from a gas stream, wherein the gas stream is passed through the precipitation tubes and the pollutants to be separated are ionized by a voltage applied to the spray electrode voltage and deflected to the tube inner wall, where it detects a liquid film and be washed off the pipe inner wall.

The voltage applied to the ionizing electrode is usually more than 80 kV. The individual rainwater pipes and the entire system must therefore be earthed accordingly. A number of grounding options are known in the art, including the use of graphite in the form of compacts, flexible filaments of carbon filaments or films. This is how the Austrian utility model application GM 50111/2016 the applicant a Niederschlagrohrbündel for wet electrostatic precipitator, wherein in the end faces of the precipitation tubes in each case a groove is milled, in which a roving, a string or a cord made of good conductive carbon fiber is inserted.

However, these rovings, cords or cords have the disadvantage that their surface even with low mechanical stress tends to stand out that individual fiber sections of the fiber composite and thereby lead to a short circuit. In addition, in certain applications, these fiber bundles are exposed to wet chemical filters which cause a deterioration of the earthing property.

To solve this problem, the EP 1 207 962 B1 to fabricate the earth conductors of electrostatic precipitators made of an electrically conductive core with an electrically insulating sheath of plastic or rubber and to couple those cladding-free end pieces which are connected to the grounding conductors connected outside the plant via a liquid-proof graphite piece, wherein the entire coupling point additionally embedded in insolating plastic. As a result, the electrically conductive core is protected from chemical attack. The derivation of the electric current from the liquid film, which takes place on the inside of the tube and absorbs the electrostatically charged, to be separated pollutants takes place from the top and from the bottom of the separator tubes, which are bordered at their two ends outside each of an electrically conductive band, which controls the flow of current leads to a Anklemmblock. From the terminal block to the ground, the section of the sheathed, two-part earth conductor passing through the separator housing leads, wherein the two earth conductor parts are electrically coupled via the mentioned piece of graphite.

Technical task

However, this solution is extremely complicated because it has a complicated structure of the coupling point on the one hand and on the other hand for the section of the enclosure of the pipe ends to the Anklemmblock can not use the patent protected earth conductor, but must resort to a non-corrosive electrically conductive tape, which is not further defined in this publication. In addition, the repair of a damaged area in the earthing conductor, which may occur due to carelessness or mechanical stress, designed as very complicated and time-consuming and therefore causes a longer downtime of the wet scrubber.

The present invention therefore has as its object to provide a grounding conductor, which is guided from the Abscheiderohren to the actual grounding system without spacers and consists of a good electrical conductivity core and the core from mechanical and chemical attack protective plastic sheath, which plastic sheath itself not may be electrically insulating, in order to ensure a good current removal from the liquid film in the separator to the earthing system.

Summary of the invention

This object is achieved on the basis of earthing conductors of the type mentioned in the present invention, that the plastic sheath covering the good electrical conductivity core consists of an electrically conductive plastic, an electrically conductive resin or an electrically conductive lacquer.

The electrically highly conductive core preferably consists of rovings, cords, filaments or cords made of carbon fiber. It is encased according to the invention with an electrically conductive plastic, an electrically conductive resin or an electrically conductive lacquer, which protects the fibers from mechanical and chemical damage. This electrically conductive sheath takes over the current dissipation from the Abscheiderohren to the electrically good conductive core, which then passes the power to the grounding system on.

The earthing conductor is attached either to the tube ends and / or to one or more flanges along the separator tubes and / or to one or more locations of the outer wall of one or more separator tubes so as to engage with the separator tube, the flange and / or the separator Liquid film is in good contact. For example, the grounding conductor is inserted or welded into the milled surfaces at the end faces and / or at the flanges of the tubes, or welded to the end faces and / or to the flanges. Alternatively or additionally, the earthing conductor can also be welded on at one or more locations on the outside of the tube bundle or of the honeycomb body or fastened in any other, good conductive manner. The contacting of the flanges and / or the outer sides of the Abscheidebungels requires that they are made of conductive or antistatic material.

embodiment

The use of the grounding conductor according to the invention is illustrated below by way of example with reference to figures. In detail shows:

1 3 is an oblique view of a bundle of honeycomb separating tubes with a plurality of earthing conductors;

2 a plan view of a flange for mounting on a bundle of circular Abscheiderohren and a flange for mounting on a bundle of honeycomb-shaped Abscheididerohren,

3 Illustrations for fixing the earthing conductor in a milled groove of the flange or raised, and

4 other alternative types of fixing the earthing conductor.

It goes without saying that embodiments other than those shown here are also within the scope of the present invention.

1 shows schematically an oblique view of a bundle of honeycomb-shaped Abscheiderohren 1 with several earthing conductors 3 , which at the end surfaces 2 the separator tubes continuously running current paths 4 form.

2 shows a plan view of a flange 5 for mounting on a bundle of circular separator tubes and a flange 5 ' for mounting on a bundle of honeycomb-shaped separating tubes, wherein the grounding conductor according to the invention 3 on the flange 5 is fixed while the tube bundle comprises circular.

The attachment can be on the top 6 or on the bottom 7 of the flange 5 take place, wherein the grounding conductor in a milled groove 8th of the flange 5 or sublime, as can be seen from the two representations of 3 comes out.

4 shows other alternative types of mounting the grounding conductor, such as a grounding ring 9 , which the tube bundle between two flanges 5 includes, or at one or more locations 10 the vertical outer surface of the tube bundle.

The illustrations according to the figures are to be understood only as examples, it is understood that, for example, the grounding conductor 3 in 1 the end face of the separator tubes can also completely cover, or the tube bundles 2 can consist of more than 3 each Abscheiderohren.

The advantage of the invention over the prior art is the fact that by the use of a conductive plastic, which sufficiently sheathed the well-conductive core of a grounding conductor to protect this core from mechanical damage and chemical attack, in a simple and inexpensive to manufacture a kind continuous grounding conductor is created, which can be mounted without complex intermediate pieces or coupling devices in the simplest way to the Abscheiderohren and / or on the flanges and can be formed continuously to the actual grounding system.

In the event that there is a mechanical damage to the grounding conductor, which exposes the highly conductive core for a chemical attack, the earth conductor according to the invention offers the opportunity to replace the damaged area in a short time and without much labor or repair, by a predetermined Route, in which the defective piece is, another grounding conductor is led to contact in parallel. The required length of this route is dependent on the operating parameters of the system.

With the grounding conductor according to the invention, it is also possible to carry out the connection of several grounding conductors with a collecting current discharge to the actual earthing system, without being used for combining on complicated coupling devices, such as in the EP 1 207 962 described grabbing back.

Since the grounding conductor according to the invention protects the electrically highly conductive core from chemical damage by a conductive sheath, a further advantage is that this grounding conductor can also be used for the power supply to the spraying electrodes which are located in each separation pipe.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• AU 50111/2016 [0004]
• EP 1207962 B1 [0006]
• EP 1207962 [0025]

Claims (8)

Grounding conductor for a wet electrostatic precipitator, which are guided by a Abscheidderohrbündel the wet electrostatic precipitator to a grounding system, wherein the grounding conductors each comprise a highly electrically conductive core and a core sheathing and this protective against mechanical and chemical attack plastic sheath, characterized in that the electric good conductive core sheathing plastic covering of an electrically conductive plastic, an electrically conductive resin or an electrically conductive paint. Grounding conductor for a wet electrostatic precipitator according to claim 1, characterized in that the earthing conductors at the tube ends and / or at one or both end faces of the tubes and / or at one or more flanges and / or at one or more grounding rings and / or at Grounding straps along the separator tubes and / or at one or more locations of the outer wall of the tube bundle are electrically conductively secured. Grounding conductor according to claim 1 or 2, characterized in that the grounding conductor inserted in milled grooves or fixed, in particular are welded and / or raised raised, in particular welded. Grounding conductor for a wet electrostatic precipitator according to claim 1, 2 or 3, characterized in that the electrically highly conductive core of rovings, filaments, cords or cords consists of carbon fiber and is coated with an electrically conductive plastic, resin or lacquer, wherein the electrical conductivity of the Plastic, resin or paint is adjusted by doping the starting material with electrically conductive metal and / or carbon particles targeted. Grounding conductor according to claim 4, characterized in that the electrically highly conductive core is sheathed with an electrically conductive plastic, resin or lacquer produced in the continuous casting process. Grounding conductor for a wet electrostatic precipitator according to one of claims 1 to 5, characterized in that in case of mechanical damage to a grounding conductor with defective piece e, over a distance in which the defective piece is another grounding conductor is guided in parallel to contact. A grounding conductor for a wet electrostatic precipitator according to any one of claims 1 to 6, characterized in that the connection of a plurality of grounding conductors is performed with a Sammelstromableitung to grounding system by the terminals of the grounding conductors are guided in parallel over a predetermined distance with the Sammelstromableitung on contact. Grounding conductor for a wet electrostatic precipitator according to one of claims 1 to 7, characterized in that the earthing conductors are used for the power supply to the discharge electrodes.

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