Classifications

• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
  • C01B13/10—Preparation of ozone
  • C01B13/11—Preparation of ozone by electric discharge
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B2201/00—Preparation of ozone by electrical discharge
  • C01B2201/10—Dischargers used for production of ozone
  • C01B2201/14—Concentric/tubular dischargers
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B2201/00—Preparation of ozone by electrical discharge
  • C01B2201/20—Electrodes used for obtaining electrical discharge
  • C01B2201/22—Constructional details of the electrodes
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B2201/00—Preparation of ozone by electrical discharge
  • C01B2201/70—Cooling of the discharger; Means for making cooling unnecessary

Definitions

• the invention relates to a device for generating ozone by surface discharge, which is formed by at least one flat or cylindrical dielectric layer, on the one side of which forms a wall of a gap or a channel for the passage of an oxygen-containing gas, there is a discharge electrode , and the other side is provided with a counter electrode.
• the ozone is currently used in a number of industrial areas, in drinking water treatment and disinfection, in cellulose bleaching, etc.
• the ozone is generated almost exclusively from an oxygen-containing gas by electrical discharge.
• Most known ozonizers operate on the principle of barrier or volume discharge, which spreads between two essentially parallel flat electrodes, between which feed gas, ie oxygen or an oxygen-containing gas, flows. At least one of the electrodes is coated with a dielectric, usually with a glass-like layer.
• the oxygen molecules are split into atoms, which are then recombined with oxygen molecules to form ozone molecules. that can.
• An ozonizer of this type is known for example from CH-PS 676710 A5.
• the electrodes here are designed as coaxial metal tubes.
• the outer wall of the inner tube and the inner wall of the outer tube are covered with an enamel layer.
• the volume discharge spreads between these walls, the feed gas flows through the circular gap between the tubes, the opposite walls of the tubes are flushed with a coolant.
• the ozone generator described in Japanese publication 63085004 is designed similarly. In it, the volume discharge spreads in two circular ring gaps between an anode tube coated on both sides with a dielectric and an inner and an outer cathode tube.
• the volume discharge is also used in the ozone generator according to EP 357911. This spreads in channels between tubular dielectric coated anodes and plate-shaped cathodes surrounding the anode tubes.
• the electrical discharge leads to the development of heat, the heat negatively influencing the efficiency of ozone generation.
• the heat that is developed in the entire space between the electrodes is almost completely transferred to the feed gas.
• the possibility of cooling the discharge space is very limited here, which consequently limits the ozone yield.
• Younger known ozonizers work on the principle of the so-called surface discharge, which spreads on the surface of the dielectric, on one side of which there is an electrode which forms a non-closed surface, and on the other side of which a continuous counterelectrode is attached.
• This solution is known from EP 483938 AI.
• the dielectric is formed here by a self-supporting ceramic tube. There is a helical electrode on one of the walls of this tube, be it the inner or the outer, while the other wall has a metallic one Counter electrode is coated. Because of the relatively low thermal conductivity of the dielectric, the ozone yield decreases with its increasing thickness. That is why it seems inevitable to minimize them.
• the wall thickness of the self-supporting dielectric tube can only be reduced to a limited extent, since the tube must remain self-supporting at its predetermined length, and its thickness is also limited by manufacturing technology.
• the object of the invention is to propose an ozone generator which would substantially reduce the disadvantages of the known devices described.
• a device for generating of ozone proposed by surface discharge which is formed by at least one flat or cylindrical dielectric layer, on one side of which forms a wall of a gap or a channel for the passage of an oxygen-containing gas, a discharge electrode is attached, and the other side of which is provided with a counter electrode.
• a wall of a self-supporting metal layer is provided with a dielectric layer which supports the discharge electrode, the self-supporting metal layer forming a counter electrode.
• the other wall of the metal layer can advantageously be flushed with a coolant. The heat generated by the surface discharge on the surface of the thin dielectric can be effectively dissipated into the coolant through the metal layer.
• the discharge electrode can be formed by metal strips attached to the dielectric layer, by a wire, a tube, or a corrugated sheet metal which come into contact with the dielectric layer.
• two dielectric layers attached to two self-supporting metal layers and provided with discharge electrodes can form the opposite walls of a gap through which the feed gas flows.
• the two dielectric layers can have a common discharge electrode which touches both layers.
• the self-supporting metal layer is designed in the form of a tube, on the inner wall of which a dielectric layer provided with a discharge electrode on its inside is mounted, the outer wall of the cylindrical self-supporting metal layer being flushed with a coolant.
• the self-supporting metal layer has the shape of a tube, on the outer wall of which one on its outer side. te with a discharge electrode provided dielectric layer is attached, wherein a coolant flows through the interior of the self-supporting layer.
• two self-supporting metal layers with dielectric layers, which are provided with discharge electrodes are arranged coaxially such that an annular gap for the coolant is formed between the dielectric layers.
• At least two self-supporting tubular metal layers with a dielectric layer and with discharge electrodes are arranged in parallel in a vessel which is provided with an inlet and an outlet for the feed gas and with an inlet and an outlet for the coolant.
• the dielectric layer is advantageously an enamel layer, which can be very thin and smooth.
• FIG. 1 shows an exemplary embodiment with a self-supporting tubular metal layer, the inner wall of which is coated with dielectric and is provided with a discharge electrode in the form of strips,
• 3 shows an embodiment of the invention which combines the previous exemplary embodiments
• 4 shows an embodiment in which the discharge electrodes are formed by wires contacting the dielectric
• Fig. 6 shows an embodiment of a large plant for ozone generation, which consists of a number of parallel ozone generators, partly in longitudinal section.
• FIGS. 7 to 9 are plan configurations of the invention, which correspond to the tubular exemplary embodiments according to FIGS. 1 and 2 and according to FIGS. 3 and 4.
• the exemplary embodiments according to FIGS. 1 to 6 represent devices for generating ozone by surface discharge in a cylindrical configuration.
• a dielectric layer 2, etc. is provided.
• an enamel layer attached to the inner wall of the self-supporting metal layer in the form of a metal tube 1.
• On the inner surface of the enamel layer there are strips 3 of a discharge electrode which is connected to an AC power source.
• the metal tube 1 is grounded.
• the feed gas 4 - air or oxygen flows through the metal tube 1, and the coolant 5 - liquid or gas - flushes the outer wall of the metal tube.
• An inner tube 6 serves only to delimit the flow profile of the feed gas 4, and an outer tube 7 delimits the flow profile of the coolant 5.
• an enamel layer 2 is attached to the outer wall of the metal tube 1, the insert gas 4 flows outside and the coolant 5 inside the metal tube 1.
• the exemplary embodiment according to FIG. 3 combines the two previous configurations: two coaxial metal tubes 11 form a gap for the passage of the feed gas 4, the surface discharge spreading out on both walls of the gap Discharge electrodes in the exemplary embodiments according to FIGS. 2 to 3 are in turn constructed as strips 3.
• FIGS. 4 and 5 correspond to the embodiment according to FIG. 3; In the exemplary embodiment according to FIG. 4, however, the discharge electrodes are formed by wire spirals 8 lying against the dielectric layers 2, the dielectric being attached to the inner and to the outer tube 1. In the embodiment according to FIG. 5, a corrugated sheet 9 is placed between the two dielectric layers 2 and touches the two layers.
• the feed gas - the air - enters an inlet chamber 10 and from there it flows through a bundle of ozone generators, which have already been described and are installed between two tube walls 11.
• the ozonized feed gas is then discharged from the outlet chamber 12. 13 denotes an inlet and 14 an outlet of the coolant.
• the invention immediately relates to configurations with flat layers and flat gaps for the passage of the feed gas or the coolant.
• Such exemplary embodiments are documented in FIGS. 6 to 9.
• the reference numeral 15 denotes flat self-supporting metal layers, 61 a wall for delimiting the flow profile and 71 walls for delimiting the coolant.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Inorganic Chemistry (AREA)
• Oxygen, Ozone, And Oxides In General (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=5464674

Family Applications (1)

Country Status (2)

Cited By (4)

Citations (6)

• 1998
  • 1998-07-21 CZ CZ19982282A patent/CZ286541B6/cs not_active IP Right Cessation
• 1999
  • 1999-07-08 WO PCT/CZ1999/000021 patent/WO2000005170A1/de active Application Filing

Patent Citations (6)

Non-Patent Citations (4)

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