Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1990-10-31
1992-06-30
Nozick, Bernard
Gas separation
Means within gas stream for conducting concentrate to collector
55148, B03C 300
Patent
active
051259362
DESCRIPTION:
BRIEF SUMMARY
AN EMISSION ELECTRODE
FIELD OF THE INVENTION
The present invention relates to an emission electrode for use in an electrostatic precipitator, in combination with one or more collector electrodes, said emission electrode including a carrier bar and a number of electrode elements.
BACKGROUND OF THE INVENTION
Emission electrodes intended for electrostatic precipitators will preferably exhibit a number of essential properties, such as high mechanical strength and rigidity, infrequent service requirements, high corrosion resistance and high efficiency, and will be capable of being manufactured and handled in a rational and efficient manner.
Electrostatic precipitators are used, for instance, to cleanse media in the form of, for instance, dust-laden gases eminating from sulphuric-acid production processes, metal smelting processes, cement manufacturing plants and incinerators.
Electrostatic precipitators can be constructed to cleanse both dry and moist gases from the dust carried thereby. Dry-gas precipitators are normally constructed for horizontal gas-throughflow, whereas moist-gas precipitators are normally constructed for vertical gas-throughflow.
In addition to the aforesaid emission electrodes, such electrostatic precipitators also include collector electrodes. A voltage source is provided for creating a potential difference between the emission electrodes and the collector electrodes, so as to generate an electric field between said electrodes in an area through which the dust-laden gas flows, the dust particles being caused primarily to settle on the collector electrodes, such that the gas exiting from the precipitator will be essentially free from dust particles.
The voltage applied in the case of such precipitators is preferably a direct voltage which preferably lies at the sparkover limit, i.e. such as to obtain the highest possible electric field-strength at which a corona effect and glowing-discharge will take place, therewith to provide the maximum precipitating force on the discrete dust particles and consequently to achieve the highest possible gas-cleansing effect.
Various kinds of such so-called rigid emission-electrodes are known to the art, all of which have a number of different drawbacks: These drawbacks are eliminated to a large extent by means of the inventive emission electrode.
OBJECT AND SUMMARY OF THE INVENTION
Thus, it is desired to configure the electrode elements of the emission-electrode in a manner which will stimulate the glow-discharge and corona-effect, while at the same time eliminating cavitational corrosion between the electrode elements and the carrier bar carrying said elements. Furthermore, the configuration of said electrode elements should be such as to enable the emission electrodes to be manufactured and handled in a rational fashion. The emission electrodes will preferably also require solely the minimum of service and will be highly efficient.
The object of the present invention is to provide an emission electrode which will fulfill the aforesaid requirements to a large degree.
BRIEF DESCRIPTION OF THE DRAWINGS FIGURES
An exemplifying embodiment of the invention will now be described in more detail with reference to the accompanying drawings in which FIG. 1 is a perspective view of an electrode frame constructed from a plurality of inventive emission electrodes; FIG. 2 is a perspective view of one embodiment of an inventive emission electrode; FIG. 3 is a perspective view of a further embodiment of an inventive emission electrode; and FIG. 4 illustrates a number of emission electrodes stacked together in a storage and transport position.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 illustrates an electrode frame 1 which includes a group of inventive electrodes 10 the ends of which are attached to a respective upper 3 and lower 4 holder device, wherein the frame 1 is intended to be mounted in one part of an electrostatic precipitator which is through-passed by dust-laden gas to be cleansed from its dust content. One or more frames 1 co-act w
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patent: 3120626 (1964-02-01), Schwernier
patent: 3483671 (1969-12-01), Wiemer
patent: 3619719 (1971-11-01), Waller et al.
patent: 4126434 (1978-11-01), Kellichi et al.
patent: 4673417 (1987-06-01), Goransson et al.
Boliden Contech AB
Nozick Bernard
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