Chemical apparatus and process disinfecting – deodorizing – preser – Process disinfecting – preserving – deodorizing – or sterilizing – A gas is substance acted upon
Patent
1994-10-28
1997-07-15
Bhat, Nina
Chemical apparatus and process disinfecting, deodorizing, preser
Process disinfecting, preserving, deodorizing, or sterilizing
A gas is substance acted upon
422 22, 422 33, 422108, 422121, 422123, 95 64, 95 72, F24F 316
Patent
active
056480466
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
When, in closed spaces, air is supplied by air supply and/or conditioning ducts, it is desired that irritating or harmful germs, in particular fungi, algae, microbes, viruses and the like, not be introduced into the space since they can harm the health or at least the comfort of persons present therein.
2. Description of Prior Art
A disadvantage of air filters is that they will generally be unable to completely remove such germs, so that the germs let through can develop further, and, when improving the filtering efficiency, the pressure drop over such filters will increase accordingly. In the case of moist and warm air, very favorable conditions for the growth of such germs can occur.
A good air disinfection is especially important when a substantial part of the air introduced into the closed space is recycled, as, for instance, in airplanes.
Eliminating germs with poisonous substances is not allowed in most countries, if these substances can reach the space in which persons are present.
SUMMARY OF THE INVENTION
It is one object of this invention to provide a method for disinfecting air in ventilation ducts, in which a non-poisonous and substantially non-volatile disinfectant in water, preferably a quaternary ammoinia complex, is vaporized into the air flow in the duct by a micro-vaporizer. The air is ionized without substantial ozone production, and the ionized particles are deposited on the walls of the duct. The walls of the duct are kept at ground potential with respect to the air-ionization electrodes.
It is another object of this invention to provide a system for disinfecting air comprising vaporizing nozzles connected to a reservoir, and ionization electrodes for ionizing the air flow. An ozone sensor is positioned downstream of the vaporizing nozzles and ionization electrodes, and can control the voltage at the ionization electrodes.
The non-poisonous disinfectant kills fungi, algae and similar organisms, and is active not only in the air flow itself, but, by precipitation thereof is also active on the walls of the duct. Thus, the germs precipitating on the walls of the duct can be effectively suppressed. When, moreover, the air is ionized, not only microbes and viruses will be effectively suppressed, but also the vaporized disinfectant particles will be charged, so that the disinfectant particles will deposit even faster on the duct walls. When the air flowing through the duct is to be moistened, preferably the same disinfectant is added to the water used therefor, in order to counteract thereby the introduction of harmful germs into the duct.
This invention will be described below in more detail by reference to a diagram of a system according to one embodiment of this invention.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a diagram of a system according to one embodiment of this invention.
DESCRIPTION OF PREFERRED EMBODIMENT
In the air ventilation duct 1, are consecutively arranged a flow sensor 3, an assembly 4 of particularly needle-shaped air ionisation electrodes, an assembly 5 of disinfectant vaporizers, and an ozone sensor 6. The direction of the flow of air is indicated by the arrows 2.
These elements are connected, by electric leads 7, with a control apparatus 8 which also comprises a high-voltage source for the electrodes 4, the vaporizers 5 being connected, by a tube 9, with a pump 10 which can pump the disinfectant dissolved in water from a reservoir 11.
The flow sensor 3 can disconnect the pump 10, and, if required, also the electrodes 4, if the air flow 2 decreases below a given threshold value. It is also possible to control the operation of the pump 10 by the flow sensor 3. The ozone sensor 6 can lower the voltage at the electrodes 4 if an ozone content threshold is exceeded. This voltage should, generally, be lower than 10 kV. In this manner more than 10.sup.12 ions/s can be produced at a current intensity of some .mu.A.
The air ionization, in particular when producing negative ions, will cause microbes, viruses and
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patent: 3757491 (1973-09-01), Gourdine
patent: 3891415 (1975-06-01), Watanabe
patent: 5196171 (1993-03-01), Peltier
patent: 5368816 (1994-11-01), Detzer
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