WO2004046028A1 - Direktgekühlter ozongenerator - Google Patents
Direktgekühlter ozongenerator Download PDFInfo
- Publication number
- WO2004046028A1 WO2004046028A1 PCT/EP2003/012892 EP0312892W WO2004046028A1 WO 2004046028 A1 WO2004046028 A1 WO 2004046028A1 EP 0312892 W EP0312892 W EP 0312892W WO 2004046028 A1 WO2004046028 A1 WO 2004046028A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ozone generator
- jacket
- steel
- ozone
- evaporator
- Prior art date
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/02—Apparatus characterised by being constructed of material selected for its chemically-resistant properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/02—Apparatus characterised by their chemically-resistant properties
- B01J2219/025—Apparatus characterised by their chemically-resistant properties characterised by the construction materials of the reactor vessel proper
- B01J2219/0295—Synthetic organic materials
-
- 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
- C01B2201/74—Cooling of the discharger; Means for making cooling unnecessary by liquid
Definitions
- the present invention relates to an ozone generator with the features of the preamble of claim 1.
- Generic ozone generators are known from the prior art, for example from WO97 / 09268. They comprise a multiplicity of hollow cathode tubes which are arranged parallel to one another between two tube plates in the manner of a tube bundle heat exchanger. The tubes form discharge spaces in the form of hollow cathodes in their interior. Anode rods with dielectric are arranged in these discharge spaces, which are subjected to a high voltage during operation and which cause a silent discharge between the anode rod and the tube. Oxygen-containing gas or pure oxygen is passed through this space. The silent discharge creates in the oxygen-containing gas from oxygen molecules, ozone molecules. The gas stream enriched with ozone in this way can then be used, for example, for disinfection purposes or for chlorine-free bleaching.
- the efficiency of ozone generation depends heavily on the temperature of the pipes.
- One mechanism that worsens the efficiency of an ozone generator is the partial heating of the hollow cathodes in the area of the heat nests that form and the temperature gradient that unavoidably develops along the tubes between the cooling water inlet and the cooling water outlet.
- the ozone-containing gas flowing inside through the hollow cathodes in this area will experience a decomposition of the ozone due to the higher temperature, which reduces the actual content of usable ozone in the gas stream produced. This temperature-induced depletion of ozone reduces the overall efficiency of the ozone generator.
- the coolant can be 1, 1, 1, 2-tetrafluoroethane (CF 3 -CH 2 F).
- a regulation of the pressure in the jacket space can be provided, particularly in such a way that the pressure above the boiling coolant is set such that a boiling temperature of less than 6 ° C. and in particular less than 5 ° C. is established. It may be advantageous to choose a boiling point below 0 ° C. Exemplary embodiments of the present invention are described below with reference to the drawing.
- FIG. 1 An ozone generator according to the invention with the associated cooling unit in a block diagram; such as
- Figure 2 a diagram of the specific ozone generation per tube versus the specific energy consumption in relative units when using air and a temperature of 5 ° C for a conventional ozone generator and a directly cooled ozone generator.
- the ozone generator comprises an inflow chamber 1 which is delimited by a tube sheet 2.
- a plurality of hollow cathode tubes 3 are inserted into the tube sheet 2 in such a way that the interior of the hollow cathode tubes is connected to the inflow chamber 1, while a jacket 4, which surrounds the hollow cathode tubes 3 on the outside, is hermetically sealed with respect to the inflow chamber 1.
- the hollow cathode tubes 3 are also hermetically connected to a second tube sheet 5, which in turn delimits an outflow chamber 6.
- Anode rods or anode wires with dielectrics, which cannot be seen in FIG. 1, are arranged in the interior of the hollow cathode tubes 3, which in turn are supplied with the required operating voltage by a high-voltage supply 7. Annular gaps are formed between the anodes and the hollow cathode tubes 3.
- the jacket 4 of the ozone generator is filled with a coolant 10.
- This coolant 10 is in a liquid physical state up to a surface 11, while it is in vapor form above the surface 11.
- the coolant 10 is circulated through a coolant circuit, which is at the top of the Ozone generator from the jacket space 4 has a steam line 14.
- the steam line 14 opens into a phase separator 15, in which any aerosols contained therein are separated from the steam.
- a further line 16 leads to a coolant compressor 17, which conducts the coolant, which is still in vapor form, to a cooler 19 via a pressure line 18 under increased pressure.
- the compressed steam is cooled in the cooler 19, the thermal energy contained therein is dissipated and the refrigerant is liquefied in this way.
- a pressure line 20 leads to a level control valve 21, which feeds the pressurized liquid coolant back into the jacket space 4.
- the coolant 11 absorbs the waste heat generated in the ozone generation, evaporates and re-enters the coolant circuit via the lines 14-22.
- the coolant 10 is in the jacket 4 in the boiling state, in which a constant temperature is established in the entire liquid coolant volume, that is to say from the point of entry of the line 22 to the surface 11. This temperature corresponds to the boiling temperature of the coolant 10 under the prevailing conditions, which are defined solely by the pressure above the surface 11.
- the temperature of the entire liquid coolant volume in the jacket 4 can be adjusted via the pressure above the surface 11. A temperature gradient along the hollow cathode tubes 3 does not occur.
- the steel used to manufacture the ozone generator is a relatively low-alloy steel which has a nickel content of less than 10% by weight and / or a molybdenum content of less than 2%. % having.
- These steels are not resistant to the corrosion to be expected in water-cooled ozone generators, in particular by chlorine ions, which induce pitting. They can still be used to build directly cooled ozone generators.
- a particularly good heat transfer can be achieved with such steels, in particular with ferritic chromium steels, since these steels have approximately twice as high a thermal conductivity than the chromium-nickel steels known to be used.
- the efficiency of the 0-zone generator is therefore further improved, since not only is the heat distribution particularly uniform, but the heat is also dissipated particularly well. This further reduces the temperature-induced ozone depletion at high ozone concentrations.
- Ferritic chromium steels with a chromium content of 10 to 17% by weight are currently preferred as materials, for example steels 1.4000 (X6Crl3), 1.4001 (X7Crl4), 1.4002 (X6CrA113) or 1.4510 (X3CrTil7), which have a thermal conductivity of approximately 30 W / mK exhibit.
- the previously used steel 1.4571 (X6CrNiMoTil7-12-2) has a thermal conductivity of only 15 W / mK.
- the designation of the steels corresponds to the "steel key" applicable in Germany.
- the jacket 4 not exposed to ozone is made from a normal steel such as ST37. Compared to the heat-conductive stainless steels mentioned above, this has the advantage of a considerably lower price, as a result of which the costs for producing the ozone generator can be further reduced.
- a further embodiment provides that a thermally conductive non-ferrous alloy, preferably an aluminum alloy, is used to manufacture the electrode tubes 3, the tube sheets 2 and 5 and the jacket 4. This has a thermal conductivity of approximately 200 W / mK, which further improves the efficiency of the ozone generator.
- a thermally conductive non-ferrous alloy preferably an aluminum alloy
- FIG. 2 This relationship, which compares generic ozone generators with the water-cooled generators known from practice, is illustrated in FIG. 2.
- the specific pipe output (for example in g / h) of a hollow cathode pipe 3 in relative units on the x-axis compared to the specific energy used for this purpose, for example in kWh / kg) on the y-axis is also shown in relative units.
- the solid line 40 shows the specific energy expenditure as a function of the pipe capacity with air as feed gas and a cooling water temperature of 5 ° C. in a conventional ozone generator which has a cooling water circuit and a downstream indirect cooling unit.
- the curve 41 below shows the corresponding specific energy expenditure for the same feed gas and the same generated ozone concentration with a device according to the invention at an evaporation temperature of likewise 5 ° C. It can be seen that the energy consumption in the middle range of the specific pipe power is about 0.70% less than that of a conventional ozone generator. This advantage comes into play particularly with low specific pipe capacities. The process was controlled so that an ozone concentration of 50g / m 3 air was generated under standard conditions. This advantage of the directly cooled ozone generators known per se is further improved by the choice of the materials proposed according to the invention.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oxygen, Ozone, And Oxides In General (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003283411A AU2003283411A1 (en) | 2002-11-19 | 2003-11-18 | Directly cooled ozone generator |
EP03775369A EP1565399A1 (de) | 2002-11-19 | 2003-11-18 | Direktgekuehlter ozongenerator |
CA002504992A CA2504992A1 (en) | 2002-11-19 | 2003-11-18 | Directly cooled ozone generator |
US10/535,519 US20060088453A1 (en) | 2002-11-19 | 2003-11-18 | Directly cooled ozone generator |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10254049.7 | 2002-11-19 | ||
DE10254049A DE10254049A1 (de) | 2002-11-19 | 2002-11-19 | Direktgekühlter Ozongenerator |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004046028A1 true WO2004046028A1 (de) | 2004-06-03 |
Family
ID=32240186
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2003/012892 WO2004046028A1 (de) | 2002-11-19 | 2003-11-18 | Direktgekühlter ozongenerator |
Country Status (6)
Country | Link |
---|---|
US (1) | US20060088453A1 (de) |
EP (1) | EP1565399A1 (de) |
AU (1) | AU2003283411A1 (de) |
CA (1) | CA2504992A1 (de) |
DE (1) | DE10254049A1 (de) |
WO (1) | WO2004046028A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2088121A1 (de) | 2008-02-08 | 2009-08-12 | "Oxy 3" Egger KEG | Transportable Einheit zur Erzeugung von Ozon |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2354189A1 (de) * | 1973-10-30 | 1975-05-07 | Weiss Geb Haensch Lucia | Ozonisator |
EP0121235A2 (de) * | 1983-03-31 | 1984-10-10 | Air Products And Chemicals, Inc. | Ozongenerator mit kochendem Kühlmittel |
JPH0196001A (ja) * | 1987-10-07 | 1989-04-14 | Sumitomo Precision Prod Co Ltd | オゾン発生器用冷却装置 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3977459A (en) * | 1973-09-07 | 1976-08-31 | Gruber & Kaja | Casting a shaped aluminum part on a work piece |
US5499508A (en) * | 1993-03-30 | 1996-03-19 | Kabushiki Kaisha Toshiba | Air conditioner |
US5408848A (en) * | 1994-02-25 | 1995-04-25 | General Signal Corporation | Non-CFC autocascade refrigeration system |
JP4221518B2 (ja) * | 1998-08-31 | 2009-02-12 | 独立行政法人物質・材料研究機構 | フェライト系耐熱鋼 |
-
2002
- 2002-11-19 DE DE10254049A patent/DE10254049A1/de not_active Withdrawn
-
2003
- 2003-11-18 EP EP03775369A patent/EP1565399A1/de not_active Withdrawn
- 2003-11-18 US US10/535,519 patent/US20060088453A1/en not_active Abandoned
- 2003-11-18 WO PCT/EP2003/012892 patent/WO2004046028A1/de not_active Application Discontinuation
- 2003-11-18 AU AU2003283411A patent/AU2003283411A1/en not_active Abandoned
- 2003-11-18 CA CA002504992A patent/CA2504992A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2354189A1 (de) * | 1973-10-30 | 1975-05-07 | Weiss Geb Haensch Lucia | Ozonisator |
EP0121235A2 (de) * | 1983-03-31 | 1984-10-10 | Air Products And Chemicals, Inc. | Ozongenerator mit kochendem Kühlmittel |
JPH0196001A (ja) * | 1987-10-07 | 1989-04-14 | Sumitomo Precision Prod Co Ltd | オゾン発生器用冷却装置 |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 013, no. 308 (C - 617) 14 July 1989 (1989-07-14) * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2088121A1 (de) | 2008-02-08 | 2009-08-12 | "Oxy 3" Egger KEG | Transportable Einheit zur Erzeugung von Ozon |
Also Published As
Publication number | Publication date |
---|---|
CA2504992A1 (en) | 2004-06-03 |
EP1565399A1 (de) | 2005-08-24 |
US20060088453A1 (en) | 2006-04-27 |
AU2003283411A1 (en) | 2004-06-15 |
DE10254049A1 (de) | 2004-06-03 |
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