Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – With means applying electromagnetic wave energy or...
Patent
1990-01-19
1991-01-01
Lechert, Jr., Stephen J.
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
With means applying electromagnetic wave energy or...
42218621, B01J 1908
Patent
active
049816560
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for the production of ozone in accordance with the preamble of patent claim 1.
One such device of the kind in question is disclosed in the art by German Patent Specification No. 34 22 989.
Ozone is a powerful oxidizing medium for organic as well as for inorganic compounds which contain elements having several degrees of oxidation. Of the manifold fields of ozone application in chemistry, its utilization in water purification must be mentioned. Practically speaking, however, its application potential is, owing to the high investment and operation cost associated therewith, still limited.
To date, of the myriad ways of producing ozone, silent electrical discharge has been the only method of producing ozone to gain acceptance to a significant degree.
In this connection, the art is familiar with types of ozone production based on the principle of silent electrical discharge, specifically, plate ozone generants, in which the electrodes consist of parallel plates, and tube ozone generants, in which the electrodes consist of concentric tubes.
The invention concerns itself with the latter-designated type of ozone generant having concentric tubes as electrodes. In the device pursuant to German Patent Specification No. 34 22 989 for the production of ozone known in the art and mentioned at the outset, two electrodes are provided which are separated from one another by a dielectric and a gas chamber. In accordance with this configuration, high-voltage alternating current is applied to the electrodes. Concurrently, oxygen or oxidized gas is made to pass through the gas chamber whereupon a high-voltage, non-corona-generating discharge and a brilliant light effect subsequently occurs between the electrodes. This high-voltage discharge results in the desired ozone formation.
In the device disclosed by DE-PS No. 34 22 989, the internal electrode consist of several solid wire-like and cylindircal metal bars and, moreover, the ratio of the diameter of the external electrode to the diameter of the internal electrode has been chosen to be greater than two.
The utilization of several cylindrical metal bars derives from the consideration that, by virtue of the relatively small radii given of the metal bars, a greater discharge is striven for because of the field intensity to be encountered inversely proportional to the radius. The device known in the art, in order to achieve a large discharge surface which, despite the metal bars having a small radius, is still sufficiently large, provides for several wire-like metals bars to form the internal electrode.
Even though ozone can be produced in this manner, there are still some drawbacks inherent in device known in the art. It must, for example, be pointed out that handling or the assembly of the internal electrode, by virtue of the formation of a multiplicity of cylindrical, wire-like metal bars is, in practice, very costly and complicated.
a further drawback consist in the fact that the internal electrode known in the art is capable of making only a relatively small discharge surface available because, with the multiplicity of wire-like metal bars abutting each other, the surfaces facing the center cannot be taken into consideration and area, so to speak, lost, such that only the outward facing surfaces are operative. This deficiency cannot be remedied even by increasing the number of the wire-like metal bars.
If, with the device known in the art, moreover, the ratio of the diameter of the external electrode to the diameter of the internal electrode is selected to be greater than two, then a relatively large median distance between the electrodes results. The greater the distance between the eletrodes, the greater the field intensity required or the voltage used for the silent electrical discharge must be.
The task of the invention is to devise a device for the production of ozone which does not exhibit the drawbacks described and which affords both ease of assembly and handling of the internal electrode and where, at the same time, the field int
REFERENCES:
patent: 4693870 (1987-09-01), Gloor et al.
patent: 4764349 (1988-09-01), Arff et al.
patent: 4774002 (1988-09-01), Heinemann
patent: 4908189 (1990-03-01), Staubach
Bhat Nina
Lechert Jr. Stephen J.
Wedeco Gesellschaft fur Entkeimungsanlagen mbH
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