Chemical apparatus and process disinfecting – deodorizing – preser – For deodorizing of – or chemical purification of – or... – Including solid – extended surface – fluid contact reaction...
Patent
1984-04-18
1985-07-23
Chiesa, Richard L.
Chemical apparatus and process disinfecting, deodorizing, preser
For deodorizing of, or chemical purification of, or...
Including solid, extended surface, fluid contact reaction...
55 74, 55267, 98 211, 165 61, 422171, 422173, 423239, 423244, 423247, B01D 5336
Patent
active
045308179
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for purification of air fed to a labor protection or vehicle cabin, which comprises at least one filter, which has a carrier material permeable to air and chemisorption masses and/or catalyst masses are disposed or contained at and/or in the carrier.
BACKGROUND OF THE INVENTION
It is known to build dust filters into the intake channels of vehicle cabins for providing fresh air. These dust filters retain the dust carried with the air, but otherwise they are not able to meet the requirements for an active protection of the passengers in the cabin against pollutants, which are carried by the air. Pollutants are found in the intake fresh air in particular with high traffic densities and such pollutants include for example hydrocarbon compounds, nitrogen oxides, acid gases (for example sulfur dioxide and other sulfur compounds as well as carbon dioxide). In addition, the intake fresh air contains carbon monoxide. It is in fact known that such pollutants can be removed from the air by way of chemisorption masses, however their use in the fresh air intake for vehicle cabins has failed so far based on the expensive construction requirements and the costs to be paid. The situation with labor protection cabins is similar, where also air containing pollutants can enter.
OBJECT OF THE INVENTION
It is an object of the present invention to provide an apparatus of the kind set forth which avoid the disadvantages mentioned above.
The process and apparatus are also to allow in a simple manner perfect purification of the intake air and to provide for comparatively high service life of the chemisorption masses and/or catalyst masses employed and thus of the filters.
SUMMARY OF THE INVENTION
This is achieved by the process of warming the air to be purified fully or in part and then feeding the air to the filter or filters. By prewarming of the air stream or air streams the deposition of humidity at the filters is prevented, which humidity deposition affects very negatively the activity of the chemisorption masses and/or of the catalyst masses. For example, it is known that chemisorption masses or also catalyst masses for the conversion of for example CO into CO.sub.2 or also for the deposition of NO.sub.x and hydrocarbon compounds, are very strongly negatively affected by the presence of humidity.
In order to eliminate this disadvantage we dispose the complete filter unit such that it is not located in the natural intake region for the fresh air but rather the air to be taken in is sucked in at the side opposed to the side of the coming stream. This can occur in the front area of the vehicle; however the air has to be redirected and based on this the water drops are not sucked into the filter at the low intake speed. Preferably the air is sucked in at the side opposite to the usual streaming in.
In accordance with a further feature of the invention it is proposed to regenerate while mounted the filter attached and serving for the deposition of NO.sub.x, HC and CO such that a partial amount of the sucked in air flushes via an aeration channel and/or via a blower the chemisorption filter and thus allows reasonably a removal of the humidity from the silica gel and CO-catalysts (for example). The sucked in air can be employed in part for the flushing of the chemisorption filter in reverse direction and simultaneously fresh air, preferably prewarmed, can be used for the preferred reverse flushing of the chemisorption filter, without at the same time interrupting the fresh air feeding to the vehicle cabin section.
It is known to remove CO in labor protection or vehicle cabins in filters via hopaclite [transition metal oxide mixture]masses; however upon air flowing through enriched in CO, the hopaclite usually receives humidity from the passing air.
This humidity leads to the destruction of the removal capacity of the hopaclite.
In order to maintain the hopaclite active, preferably for the removal of CO in the air supply of rooms where humans work, the invention provides that the water
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Dewert Heribert
Gresch Heinrich
Holter Heinz
Igelbuscher Heinrich
Chiesa Richard L.
Dubno Herbert
Holter Heinz
Ross Karl F.
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