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WO2002081369A1 - Generateur d'ozone - Google Patents

Generateur d'ozone Download PDF

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Publication number
WO2002081369A1
WO2002081369A1 PCT/US2000/025992 US0025992W WO02081369A1 WO 2002081369 A1 WO2002081369 A1 WO 2002081369A1 US 0025992 W US0025992 W US 0025992W WO 02081369 A1 WO02081369 A1 WO 02081369A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
dielectric
crests
top face
ozone
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2000/025992
Other languages
English (en)
Inventor
Mark D. Goodley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AGTECH INTERNATIONAL Inc
Original Assignee
AGTECH INTERNATIONAL Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AGTECH INTERNATIONAL Inc filed Critical AGTECH INTERNATIONAL Inc
Priority to PCT/US2000/025992 priority Critical patent/WO2002081369A1/fr
Anticipated expiration legal-status Critical
Publication of WO2002081369A1 publication Critical patent/WO2002081369A1/fr
Ceased legal-status Critical Current

Links

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
    • C01B2201/12—Plate-type 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

Definitions

  • the invention is an ozone generator of the stack-type plate design employing interleaved electrodes and dielectrics, and more specifically provides for turbulent oxygen flow and more controlled exposure of the entering oxygen to corona discharge.
  • Ozone has increasing importance as a disinfectant.
  • Ozone (0 3 ) an allotropic form of oxygen, is a powerful oxidant.
  • Ozone effectively kills bacteria by breaking up their molecular structure, inhibits fungal . growth, and inactivates many viruses, cysts, and spores.
  • soaps, oils, and chlora ines can be rendered environmentally safe by ozone treatment.
  • Ozone combines with water to form hydroxyl radicals and peroxide, thus sterilizing the water. Because ozone is unstable, the ozone decomposes to oxygen leaving no residues to further eliminate.
  • Ozone has a half-life of about 22 minutes in water at ambient temperatures. Consequently, for most cleaning/disinfecting operations, the cleaning residue after a short period of time contains only dead biological matter and water and, typically, requires no special disposal.
  • ozone generator is of compact size and as efficient as possible.
  • s -a ozone—genera-tor-,— and- a preferred embodiment comprises an enclosure including"'an entry chamber for receiving gas, such as air from a dryer or from an o ygen concentrator or oxygen, such as from a liquid oxygen source, a plurality of ozone generating cells comprising interleaved electrodes and dielectrics having passageways therebetween for receiving gas from the entry chamber and converting the oxygen therein to ozone, an alternating voltage generator connected to the electrodes so as to create corona discharges between them and an adjacent dielectric, and an exit chamber 85 at the other end 84 of enclosure for receiving the gas and ozone.
  • gas such as air from a dryer or from an o ygen concentrator or oxygen, such as from a liquid oxygen source
  • a plurality of ozone generating cells comprising interleaved electrodes and dielectrics having passageways therebetween for receiving gas from the entry chamber and converting the oxygen therein
  • An ozone generating cell includes a first electrode, a second electrode, and a first dielectric.
  • the first electrode includes a -top face.
  • the first dielectric includes- a botrom face opposed to the top face of the first electrode and separated therefrom so as to form a first passageway, and a top face.
  • the second electrode includes a bottom face opposed to the top face of the first dielectric and separated therefrom so as to form a second passageway.
  • the received gas flows through the passageways.
  • the top face of the first electrode includes a plurality of crests and troughs relative to the bottom face of the dielectric and traversing the flow of received gas through the first passageway.
  • the bottom face of the second electrode includes a plurality of crests and troughs relative to the top face of the dielectric and mirroring said crests and troughs of the top face of the first electrode.
  • the passageways between the crests and the dielectric have a uniform gap.
  • Each dielectric has a plurality of lines of corona discharges on each side.
  • The. received gas must flow through substantially a continuous curtain of corona discharge at each crest gap.
  • the turbulent flow increases the ozone-forming dwell time within the generator..
  • the back pressure resulting from the turbulent flow increases the pressure concentration of gas exposed to the coronas.
  • Figure- 1 is- a--diagram -of an ozone-generating device including a preferred em b odiment _of the ozone generator of the invention.___
  • Figure 2 is a " partial perspective view of an ozone generating cell of the preferred embodiment of Figure 1.
  • Figure 3 is a partial vertical cross-sectional view of the ozone generator of Figure 1.
  • Figure 4 is a partial vertical cross-sectional view of a first alternate embodiment.
  • Figure 5 is a partial vertical cross-sectional view of second alternate embodiment.
  • FIG. 1 is a diagram of an ozone generating device 80 including an enclosure 81 containing a first preferred embodiment -1 0 A of the ozone generator 10 of the invention.
  • Gas, including oxygen, such as air 9 8 from a dryer or from an oxygen concentrator is received by.
  • propelling means such as pump P, an d propelled into an entry manifold or chamber 83 at one end 82 of enclosure 8 1.
  • Entering air 9 8 flows through ozone generator 10A, where the oxygen gas is converted to ozone.
  • the gas including ozone 99 enters exit manifold or chamber 85 at the other end 84 of enclosure 81 an d exits through exit orifice 87.
  • O zone generator 10 A includes a plurality of ozone generating cells including a plurality of high potential electrodes, , such as first electrodes 2 0 , connected to an alternating high voltage source 9 5, a plurality of earth or ground electro d es, such as secon d electro d es 4 0 , connected to ground and a plurality of d ielectrics 30 , a dielectric 30 being disposed between adjacent first electrodes 2 0 and second electrodes 40. Electrodes 20,40 and d ielectrics 30 are- all mounted interleaved in spaced relationship with their faces opposed. In this manner, first electro d es 20 and second electrodes 40 are- electrically connected such that alternating high voltage electrical potentials exist between them.
  • FIG. 81 shows a partial perspective view of a preferred embodiment of an ozone generating cell of the ozone generator 10A of Figure 1.
  • Figure 3 being a partial vertical cross-sectional view of Figure l.
  • Ozone generator 10A generally includes a first electrode 20; a first dielectric 30 and a second electrode 40.
  • First electrode 20 includes a first end 21, a second end 22, an entry side 23, an exit side 24, bottom face 25, and a top face 26.
  • first electrode 20 is a corrugated plate such that its top and bottom faces 26,25 include a plurality of crests and troughs traversing between its first and second ends 21,22.
  • One end or both ends 21,22 are supported, such as by enclosure 81 and/or by nonconducting spacers.
  • First dielectric 30 includes a first end 31, a second end 32, first side 33, a second side 34, a bottom face 35, and a top face 36. Bottom face 35 is opposed to top face 26 of first electrode 20 and separated therefrom so as to form a passageway 90, such as first passageway 90A, for flow of air 98.
  • Dielectric 30 may be made of suitable dielectric materials, such as glass or ceramic, with ceramic being preferred. Ceramic is preferred because it well withstands the temperatures produced, yet does not readily break if subjected to shock or if it is rapidly cooled, as happens in some usage environments of generator 10A.
  • Second electrode 40 is a corrugated plate and includes a first end 41, a second end 42, an entry side 43, an exit side 44, a bottom face 45, and a top face 46. Bottom face 45 is opposed to top face 36 of first dielectric 30 and- separated therefrom so as to form a second passageway 90B. Electrodes 20, 40 may be made out of many suitable conductive materials as are well-known in the art, such as aluminum or stainless steel, with stainless steel being preferred because of its greater resistance to corrosion.
  • Received oxygen bearing gas ' 98 flows through first passageway
  • Received oxygen bearing gas 98 also flows through second passageway 90B from entry side 43 of second electrode 40 to exit side 44-- of second electrode 40.
  • Top face 26 of first electrode 20 includes a plurality of crests 26C and troughs traversing the flow of received gas 98 through first passageway 90A.
  • Bottom face 45 of second electrode 40 includes a plurality of crests 45C and troughs mirroring the crests and troughs of top face 26 of first electrode 20.
  • the gap G between each crest 26C, 45C and dielectric 30 is uniform.
  • Fig. 3 shows a plurality of first electrodes 20, dielectrics 30 and second electrodes 40 mounted in accordance with the preferred embodiment of the invention.
  • Entry oxygen-bearing gas 98 flows through passageways 90A-90F.
  • the crests and troughs of adjacent electrodes 20,40 mirror those of the adjacent electrodes thus varying the height of passageways 90 relative to dielectrics -30 with the height being a minimum at gap G between each crest and dielectric 30.
  • Typical size of gap G is l-3mm.
  • the resultant electric field strength varies from a maximum between mirrored crests to a minimum between mirrored troughs.
  • Alternating voltage source 95 provides voltage to produce a discharge or corona between mirrored crests and interposed dielectric 30.
  • the wave form for producing the corona discharge is essentially an alternating high- frequency square wave with a typical voltage range being alternating 4K-10K volts and typical frequency range being 10K-30K Hertz. Therefore, along the length of each gap G, each dielectric 30 has a series of discharge coronas almost continuously touching both bottom and top faces 35, 36 so as to form a curtain of corona.
  • the voltage alternates at high frequency such that all entering gas 98 must pass through a fairly continuous curtain of corona at each gap G. In this manner, all of the oxygen molecules are exposed to corona for disassociating atomic oxygen.
  • the wider areas of passageways 90 between the troughs and dielectrics 30 provide for turbulent flow of air 98 and provide dwell time for recombination of the disassociated oxygen atoms into ozone.
  • the turbulent flow increases the ozone-forming dwell time within the generator. •
  • the - back pressure resulting from the turbulent flow increases the pressure concentration of gas exposed to the coronas.
  • Figure 4 is a partial vertical cross-sectional view of a first alternate embodiment ozone generator 10B, similar to generator 10A except between adjacent electrodes 20,40 there is only one passageway 90 because the interposed dielectric 30B has a face in contact with the face of one of the electrodes 20,40. Thus, there is only one passageway 90 for each dielectric 30B.
  • Figure 5 is a partial vertical cross-sectional view of a second alternate embodiment ozone generator 10C, similar to 10B except the electrodes of one set of electrodes, such as ground electrodes 40C, are flat and have both their faces in contact with the adjacent interposed dielectrics 30C.
  • the present -invention provides an extremely compact and efficient ozone generator.

Landscapes

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

Abstract

L'invention concerne un générateur d'ozone (10A) dans lequel les différents diélectriques (30) comportent une pluralité de lignes de décharge par effet couronne, sur chaque côté. Un flux turbulent augmente le temps de maintien pour la formation d'ozone dans le générateur. Une contre-pression résultant du flux turbulent accroît la concentration de pression du gaz exposé aux décharges par effet couronne. Le générateur comprend plusieurs cellules génératrices d'ozone qui sont équipées d'électrodes et de diélectriques intercalés. Des passages espacent mutuellement ces électrodes et ces diélectriques pour la réception d'oxygène chargé en gaz. Dans chaque cellule, les électrodes, de configuration striée (20, 40), présentent des crêtes symétriques placées à distance équivalente d'un diélectrique. Il existe donc au niveau des crêtes un certain nombre d'intervalles uniformes par lesquels le gaz reçu doit passer.
PCT/US2000/025992 2000-04-02 2000-04-02 Generateur d'ozone Ceased WO2002081369A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2000/025992 WO2002081369A1 (fr) 2000-04-02 2000-04-02 Generateur d'ozone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2000/025992 WO2002081369A1 (fr) 2000-04-02 2000-04-02 Generateur d'ozone

Publications (1)

Publication Number Publication Date
WO2002081369A1 true WO2002081369A1 (fr) 2002-10-17

Family

ID=21741795

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/025992 Ceased WO2002081369A1 (fr) 2000-04-02 2000-04-02 Generateur d'ozone

Country Status (1)

Country Link
WO (1) WO2002081369A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1743202A (en) * 1926-10-04 1930-01-14 Sun Maid Raisin Growers Of Cal Ozone apparatus
US2113913A (en) * 1936-02-01 1938-04-12 Wilson H Cragun Ozonator
FR2182244A1 (en) * 1972-04-26 1973-12-07 Patelhold Patentverwertung Ozone prodn - by electrical discharge with dielectric plates between electrodes
FR2578632A1 (fr) * 1985-03-07 1986-09-12 Bouix Jean Bernard Appareil ozoniseur de moyenne production a concentration reglable
US5554345A (en) * 1992-10-14 1996-09-10 Novozone (N.V.) Limited Ozone generation apparatus and method
US5733512A (en) * 1997-04-18 1998-03-31 Industrial Technology Research Institute Ozone generating device
EP0901983A1 (fr) * 1996-03-04 1999-03-17 KABUSHIKI KAISHA KOBE SEIKO SHO also known as Kobe Steel Ltd. Ozoniseur

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1743202A (en) * 1926-10-04 1930-01-14 Sun Maid Raisin Growers Of Cal Ozone apparatus
US2113913A (en) * 1936-02-01 1938-04-12 Wilson H Cragun Ozonator
FR2182244A1 (en) * 1972-04-26 1973-12-07 Patelhold Patentverwertung Ozone prodn - by electrical discharge with dielectric plates between electrodes
FR2578632A1 (fr) * 1985-03-07 1986-09-12 Bouix Jean Bernard Appareil ozoniseur de moyenne production a concentration reglable
US5554345A (en) * 1992-10-14 1996-09-10 Novozone (N.V.) Limited Ozone generation apparatus and method
EP0901983A1 (fr) * 1996-03-04 1999-03-17 KABUSHIKI KAISHA KOBE SEIKO SHO also known as Kobe Steel Ltd. Ozoniseur
US5733512A (en) * 1997-04-18 1998-03-31 Industrial Technology Research Institute Ozone generating device

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