Gas separation: apparatus – Electric field separation apparatus – Electrode retaining or supporting means
Patent
1996-04-01
1998-08-11
Chiesa, Richard L.
Gas separation: apparatus
Electric field separation apparatus
Electrode retaining or supporting means
96 96, 313355, B03C 341
Patent
active
057922438
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a discharge electrode for electrostatic precipitators, which consists of a support of non-conductive materials on whose exterior a fabric of crossed and twisted threads of carbon fibers is disposed, and to the use of the discharge electrode.
Various types of electrodes are known. Discharge electrodes and precipitation electrodes, which are made of carbon, are described in DE-OS 28 51 757 and DE-AS 23 11 468. The carbon is employed there in the form of fabrics, felts and threads.
A precipitation electrode for electric precipitators, which has a foil of carbon permanently connected with a support on its electrically conducting surface, is described in DE-PS 25 00 888. The carbon foil is made of pressed graphite, while the support can consist of a plastic material.
An electrode consisting of an electrically conducting support, on which a fiber material made of a dielectric substance is disposed, is described in EP 0 031 623 A1.
An acid-resistance discharge electrode for electric filters is described in DE-GB 1 694 459, which consists of an acid-resistant non-metallic support body and an acid-resistant metal as the discharge member, wherein metal foils, in particular of noble metals, are disposed on the support body in such a way that the foils form discharge peaks or discharge edges on the surface of the support body.
An electrode consisting of a perforated support on whose surface carbon is disposed is described in U.S. Pat. No. 1,130,215. In this case the carbon is employed in powder form and forms discharge peaks on the exterior.
A device for the removal of solid or liquid particles from a gas flow is described in DE-OS 25 18 952, wherein the gas flow is guided through a separating chamber which is delimited by two electrodes disposed opposite each other, and wherein an electrical field is generated between the electrodes, which is of such strength that essentially no ionization takes place in the gas flow. At least one of the electrodes of this device is provided with a coating consisting of a fiber material with limited electrical conductivity and having a large number of protruding thin fibers. The coating here can consist of asbestos fibers, glass fibers, textile fabric, stainless steel or fine metal fibers which are embedded in a plastic support.
SUMMARY OF THE INVENTION
The object on which the invention is based is to provide a discharge electrode which is corrosion-resistant and which at the same time permits an electrostatic charge of the solid and/or liquid particles contained in the gas in the corona for electrostatic precipitation.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a discharge electrode for electrostatic precipitators which has a support of non-conductive materials with a fabric of crossed and twisted threads of carbon fibers arranged in its outer side, wherein in accordance with the present invention the upper end and/or the lower end in a length of 400-600 mm are covered with an additional layer with synthetic elastomers. In this case the support is made in an advantageous manner of plastic materials or caoutchouc. In an advantageous manner the carbon fibers are made of graphite and have a diameter between 5 and 10 .mu.m. Dry or wet operating electric filters can be employed as electrostatic precipitators. It has been shown in a surprising manner that the fabric made of crossed and twisted threads of carbon fibers and disposed on the exterior of electrically non-conduction materials makes possible a corona, by means of which solid or liquid particles contained in the exhaust gas are electrostatically charged and precipitated at the precipitation electrodes. The discharge electrode is markedly corrosion-resistant and is therefore suited for relatively long working periods.
A preferred embodiment of the invention consists in that the threads respectively consist of 2400 to 2600 carbon fibers. It is possible to create the fab
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Kunoff Heinz
Leluschko Georg
Meffert Heinz
Chiesa Richard L.
Metallgesellschaft Aktiengesellschaft
Striker Michael J.
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