Process and device for generating ozone

Details Process and device for generating ozone Process and device for generating ozone

1997-05-02

2000-08-22

Mayekar, Kishor

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

With means applying electromagnetic wave energy or...

42218611, 42218619, 4221862, B01J 1908

Patent

active

061067881

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND AND SUMMARY

The invention concerns a method of generating ozone in accordance with the preamble to claim 1 and a device for generating ozone in accordance with the preamble to claim 2.
Ozone is a powerful oxidizing agent for organic substances and for inorganic compounds which contain elements with several oxidation degrees. Of the multiple fields of application for ozone, its use for water conditioning is to be mentioned among other things.
Technically, ozone can be generated by silent discharge in an oxygen-containing gas. Silent discharge is, in contrast to spark discharge, to be understood as a stable plasma discharge or coronal discharge. Molecular oxygen is dissociated into atomic oxygen. The reactive oxygen atoms subsequently attach themselves in an exothermic reaction to molecular oxygen and form tri-atomic oxygen molecules, accordingly ozone. The ozone yield is dependent among other things on the electric field strength and operating temperature. Moreover, a dependence on gas composition has been observed. The dependence on operating temperature rests on the fact that ozone at higher temperatures decomposes more rapidly again into molecular oxygen and, due to the accordingly dictated displacement of the equilibrium between the originating and disintegrating ozone, the available ozone concentration is less.
Higher field strengths, which likewise lead to an increased ozone yield, can among other things be achieved through a diminution of the gap and through the selection of dielectrics with higher relative dielectricity constants. For dielectrics with high relative dielectricity constants, doped glasses or ceramic materials enter the question. To be sure, dielectrics of ceramic materials have the drawback that they are inhomogeneous and can practically have a lower puncture strength than homogeneous materials. Furthermore, high-grade ceramic materials in the form of formed bodies with high dimensional stability are extremely expensive. Thinner dielectrics, furthermore, increase the risk of dielectric puncture.
Limits have been established for diminution of the gap due to inescapable manufacturing tolerances along with bending and buckling due to mechanical stresses and heat expansion in operation.
Since a field-strength increase by diminution of the gap width and by using dielectrics with high dielectricity constants leads to a considerable rise in the manufacturing cost, economic limits have here been established.
With DE 38 19 304 C2 as a point of departure, basic to the invention is the task of describing a method and a device with which the ozone yield can be further increased at a comparable employment of energy.
This task is solved in a method according to the present invention and in a device according to the present invention.
The success of the invention rests on several physical influences.
Due to the electrically and thermally conductive arrangement it is achieved that, during forced cooling of the electrodes, the heat that occurs due to the discharge as well as due to the exothermic reaction of the atomic with the molecular oxygen will be better conveyed in the gap between the electrode and the dielectric as well as out of the dielectric since, on the one hand, a direct heat-conducting connection exists between the electrode and the dielectric and, on the other, the area of heat transmission to the throughflowing gas is substantially increased while the heat transmission path to all the points inside the gap is decreased. Since ozone has the tendency to disintegrate again with increasing temperature so that a temperature-dependent equilibrium adjusts itself between the ozone content and the oxygen content, effective cooling can diminish the disintegration of ozone and accordingly improve the yield.
In contrast to a normal gap, which the oxygen-containing gas and the generated ozone flows through in an almost laminar flow, there is forced, due to the electrically and thermally conductive gas permeable arrangement, a turbulent flow in the gap with the consequence that the gas m

REFERENCES:
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patent: 5458856 (1995-10-01), Marie et al.
"Modular Ozonizers", Inventor: Fritz Hailer, Applicant: Ingenieria y Technica del Secado, S.A., ES 2,027,892 (Jun. 16, 1992), Application No. 9,100,163 (Jan. 22, 1991), Chemical Abstract, vol. 117, No. 24, Dec. 14, 1992, Abstract No. 236654b.
"Active Nuclide Generating Device", Applicant: Sachiko Okazaki, Japanese Publication No. 1-51303, Feb. 27, 1989, Application No. 62-206533, Aug. 21, 1987, Patent Abstracts of Japan, vol. 13, No. 241, (C-604) [3589], Jun. 6, 1989.
"Ozonizer", Applicant: Hitachi Seisakusho K.K., Inventor: Shiyouhei Uozumi et al., Japanese Publication No. 53-54190, May 17, 1978, Application No. 51-128330, Oct. 27, 1976, Patent Abstracts of Japan, vol. 2, No. 93, (C-78), Jul. 29, 1978.

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