Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – With means applying electromagnetic wave energy or...
Patent
1990-07-16
1993-04-06
Walsh, Donald P.
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
With means applying electromagnetic wave energy or...
422 24, 313493, 313634, B01J 1912
Patent
active
052001563
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND
The invention relates to a device pursuant to the preamble of Claim 1 as well as pursuant to the preamble of Claim 12.
Such devices intended for irradiating media with UV light are generally known. In this connection, the wish is that the devices for irradiating media with UV light be more effective in their treatment effect than possible chemical methods, with the same economic efficiency. This presupposes a high UV light/space/time yield with the lowest possible energy and apparatus expenditure.
For implementation of these devices, a combination between the irradiation space and the UV light source arrangement is generally striven for, in which each volume element of the medium is irradiated with the same UV dose, to the greatest extent possible. The ideal case to achieve the highest degree of effectiveness consists of having the average dose be equal to the minimum dose. To achieve this goal, the following criteria must be optimized:
The prerequisites pursuant to Numbers 2 and 3 can often only be fulfilled by means of complicated auxiliary equipment for swirling up the medium to be sterilized or treated.
The invention is based on the task of improving a device for irradiating flowing liquids and/or gases with UV light, so that radiation losses are reduced, in order to achieve the most uniform irradiation intensity possible, and furthermore so that uniform contact times can be achieved, all with a simple structure.
Pursuant to a first alternative, this task is accomplished with the characterizing features of Claim 1, for the device stated in the preamble of Claim 1.
The new device is designed for installation in a pipeline, and has a new type of radiation distribution for this purpose, with which the criteria mentioned above can be fulfilled to a great extent. The use of a pipeline means that a pressure system is involved, in which the medium (liquid and/or gases) is passed through the pipeline by means of pressure.
Optionally, either a single or several quartz protective pipes, each equipped with a rod-shaped UV light source, are arranged in the center of the housing and perpendicular to the flow direction of the medium. Whether one or several UV light sources are used depends on the desired throughput amount. For high throughput performance, a greater number of UV light sources is used, arranged next to one another and in a maximum of two rows. If arranged in two rows, the UV light sources are offset relative to one another in the flow direction of the medium.
The UV light sources preferably have a flat oval cross-section and special radiation characteristics, as well as higher electrical outputs, in comparison with known UV light sources with a round cross-section. For a flat emitter--in other words for a UV light source with a flat oval cross-section--the radiation flow is emitted 3/4 via the broad side and only 1/4 via the narrow side. Radiation via the broad side also is much more bundled than for UV light sources with a round cross-section. The UV light sources emit greater than 50% of their emitted light via the broad side flat walls, and lesser than 50% via the narrow side oval walls.
This results in UV emission with the maximum directed towards the two flat sides. By arranging one or several UV light sources (flat emitters) in a plane perpendicular to the flow direction and adjacent to the connection openings of the housing or the connected pipeline, the maximum of the UV emission reaches the connected pipeline with the radiation going essentially parallel, specifically reaching both the inflowing and the outflowing medium in equal parts.
Since the upstream and downstream pipeline is supposed to run in a straight line with the radiation direction, the radiation can penetrate into the medium without loss, i.e. until it is completely absorbed. This has not been the case with the devices known until now.
Although a device for sterilization of liquids is known from Austrian Patent 362 076, in which a radiation loss is prevented to a great extent by using reflectors, a large part of the
REFERENCES:
patent: 3634025 (1972-01-01), Landry
patent: 3637342 (1972-01-01), Veloz
patent: 3657087 (1972-04-01), Scott
patent: 4214962 (1980-07-01), Pincon
patent: 4323810 (1982-04-01), Horstmann
patent: 4952376 (1990-08-01), Peterson
Jenkins Daniel
Walsh Donald P.
Wedeco Gesellschaft fur Entkeimungsanlagen mbH
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