Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – With means applying electromagnetic wave energy or...
Patent
1998-06-01
1999-09-07
Mayekar, K.
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
With means applying electromagnetic wave energy or...
42218607, B01J 1908
Patent
active
059500654
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method and device for producing ozone by subjecting oxygen to a high frequency alternating current with high voltage over a dielectricum.
BACKGROUND OF THE INVENTION
Ozone gas is used to an increasing extent in many industrial applications, not the least waste water treatment, where it can destruct or remove for example
Waste water treated in a final step with ozone can without difficulty be reused for washing, irrigation or fire fighting.
Ozone is further used for pretreating drinking water, enhancing its quality considerably.
Last but not least ozone is used as the only acceptable alternative to chlorine for bleaching pulp in the paper making industry.
The demand for ozone is accordingly very high and steadily increasing.
It is well known that ozone is generated by so called dark or cold electrical discharges in oxygen gas or oxygen-rich gas mixtures. Presently known devices for generating ozone in satisfactory quantities and concentrations for industrial applications, however, are very voluminous and are difficult and expensive to service.
Known oxygen generators are often constructed in large, hermetically enclosed metal containers, which makes them very sensitive to moisture, both external and in the supplied gas, from which the ozone is generated. Already at low moisture contents leak currents may occur with resultant risks for electrical short-circuits, leading to the destruction of the generator unit in question.
The objects of the invention are to increase the yield from the ozone making process, to decrease the physical dimensions of the device, to decrease the moisture sensitivity, and to minimize the stoppage times at service.
THE INVENTION
These objects are according to the invention fulfilled in that oxygen gas is admitted to a narrow space with at least one plane wall of a material constituting the dielectricum and that the high frequency alternating current with high voltage is applied to a thread shaped electrode in the space, the opposite side of the wall being earthed and cooled.
Preferably, the narrow space has two plane walls of a material constituting dielectrica.
In one embodiment earthed metal blocks containing cooling medium are applied against the walls.
In another embodiment an earthed cooling medium is applied directly against the walls. This is obtained in that generator units--each formed by the walls with the internal electrode--are submerged in the earthed cooling medium.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in further detail below reference being made to the accompanying drawings, in which
FIG. 1 is a schematic illustration of the basic construction of a unit in an ozone generator according to a first embodiment of the invention,
FIG. 2 is a top view of an electrode net for use in an ozone generator as illustrated in FIG. 1,
FIG. 3 is a side view of an ozone generator according to the first embodiment,
FIG. 4 is a top view of a second embodiment of an ozone generator according to the invention,
FIG. 5 is a side view of the embodiment according to FIG. 4,
FIG. 6 is a top view of a generator unit for the embodiment according to FIGS. 4 and 5, and
FIG. 7 is a side view of the generator unit according to FIG. 6.
DETAILED DESCRIPTION OF EMBODIMENTS
An ozone generator according to a first embodiment of the invention is schematically depicted in FIGS. 1-3.
As shown in FIG. 1, an ozone generator unit 1 comprises two plates 2 of pure aluminum oxide or alumina, a ceramic material. It is desirable to use an aluminum oxide with a purity of 99.9% or even better. Each such plate may for example have the dimensions length 160 mm, width 115 mm and thickness 0.65 mm.
A metal electrode 3 in the form of a net of acidproof stainless steel or the like is arranged between the two ceramic plates 2. The net 3, also shown in FIG. 2, is surrounded by a frame 3', which is made of the same material as the plates and may have a thickness of 0.5 mm providing a space with the same height between the two plates 2.
REFERENCES:
patent: 3899685 (1975-08-01), Francis et al.
patent: 4034229 (1977-07-01), Grossen et al.
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