Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – With means applying electromagnetic wave energy or...
Patent
1992-10-20
1996-05-14
Walsh, Donald P.
Chemical apparatus and process disinfecting, deodorizing, preser
Chemical reactor
With means applying electromagnetic wave energy or...
42218618, 422907, C01B 1311
Patent
active
055164935
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus and method for producing ozone from a gas containing molecular oxygen, by means of a corona discharge.
BACKGROUND OF THE INVENTION
Ozone is a strong oxidizing agent. It has many uses in sanitation and sterilization: as a germicide, bactericide, or a general antiseptic. One particular use of ozone, or ozonated air, is in the purification of waste and wastewater, especially in the secondary or tertiary treatment of sewage, or oxidation of industrial waste either liquid or gaseous. It is also used in various processing steps in the manufacturing sector.
In the context of sterilization or sanitation, ozone has a number of desirable characteristics. First, it is, relative to other sanitation and sterilization agents, environmentally safe. Although it is caustic, requiring certain safeguards in storage, handling and use, ozone occurs naturally through a variety of chemical pathways. Its degradation product is elemental oxygen. Ozone is a gas at room temperature and is handled easily, without many of the hazardous material handling requirements associated with alcohols and/or volatile hydrocarbons.
There are several known methods for producing ozone from air or another oxygen-containing gas. A number of the known commercially used processes for making ozone employ an electrical discharge. Oxygen, or a gas containing molecular oxygen typically air is passed between two electrodes separated by a dielectric material. The electrical discharge converts a portion of the gas to ozone and an ozone enriched gas is drawn off from the area through which the current passes.
Typically, the types of apparatus which have been used to produce ozone have two electrodes, separated by a dielectric barrier, and a space for the fast flow of a gas containing molecular oxygen. The gas flows through the region between the electrodes, through which a high electrical discharge passes. Different arrangements of these elements are known. A common arrangement is for the two electrodes to be in the shape of concentric tubes. In this configuration, the feed gas flows through the annular gap between the two tubes. The electrodes are separated by a dielectric material, usually glass. The outer tube can be made of stainless steel while the inner electrode may comprise a thin metal layer deposited on the inside of the dielectric glass tube. Typically, a commercial ozone generator will comprise a number of these electrode pairs, in order to produce a sufficient quantity of ozone for the desired purpose.
In various of the known methods for producing ozone, prior to the present invention, the process described above is limited by low efficiencies of conversion of the gas containing oxygen into ozone, relative to the amount of electrical energy input into the apparatus. Known apparatus transfer a substantial portion of their input electrical energy into heat, raising the temperature of the apparatus as well as that of the discharged gas. Thus, they typically require cooling systems.
Cooling systems for ozone generating equipment are typically expensive, comprising a substantial portion of the total capital cost of the apparatus. In addition, cooling systems require further energy input, further reducing the energy efficiency of the conversion of feed gas into ozone. Moreover, cooling equipment imposes additional maintenance requirements on the operation of the ozone generating unit. The cooling system must be operational in order for the system to deliver ozone at a usable temperature in many applications. For example, the air discharge temperature of existing units can reach 300.degree. C., when the cooling system fails. In addition to these problems, the known apparatus for producing ozone typically have only one dielectric barrier. The remaining electrode, therefore, is subject to degradation by the ozone produced in the apparatus.
The relatively low energy efficiency of existing apparatus for producing ozone leads to the consumption of large amounts of electricity to produce ozone using apparatus pr
REFERENCES:
patent: 254424 (1882-02-01), Yost
patent: 1149254 (1915-08-01), Dumars
patent: 2936279 (1960-05-01), Rindtorff
patent: 3457160 (1969-07-01), Fortier
patent: 3671417 (1972-06-01), Louboutin
patent: 3677931 (1972-07-01), O'Hare
patent: 3730874 (1973-05-01), Trub
patent: 3766051 (1973-10-01), Bollyky
patent: 3899684 (1975-08-01), Tenney
patent: 3963625 (1976-06-01), Lowther
patent: 4214995 (1980-07-01), Saylor
patent: 4410495 (1983-10-01), Bassler et al.
patent: 4417966 (1983-11-01), Krauss et al.
patent: 4614573 (1986-09-01), Masuda
patent: 4725412 (1988-02-01), Ito
patent: 4774062 (1988-09-01), Heinemann
patent: 4834948 (1989-05-01), Schmiga
patent: 4908189 (1990-03-01), Staubach
patent: 4960570 (1990-10-01), Mechtersheimer
patent: 4986908 (1991-01-01), Hirth et al.
patent: 5008087 (1991-04-01), Batchelor
patent: 5093087 (1992-03-01), Freeman
Bell Maxwell G.
Cable Dale C.
Pratt David T.
Sharpe Matthew P.
Smith Stephen J.
Jenkins Daniel
Walsh Donald P.
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