WO1990015228A1 - Vorrichtung zum entfernen oxidierbarer bzw. verbrennbarer partikel aus abgasen - Google Patents
Vorrichtung zum entfernen oxidierbarer bzw. verbrennbarer partikel aus abgasenInfo
- Publication number
- WO1990015228A1 WO1990015228A1 PCT/EP1990/000864 EP9000864W WO9015228A1 WO 1990015228 A1 WO1990015228 A1 WO 1990015228A1 EP 9000864 W EP9000864 W EP 9000864W WO 9015228 A1 WO9015228 A1 WO 9015228A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- vortex tube
- exhaust gases
- exhaust
- annular chamber
- exhaust pipe
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/037—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of inertial or centrifugal separators, e.g. of cyclone type, optionally combined or associated with agglomerators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/05—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of air, e.g. by mixing exhaust with air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/26—Construction of thermal reactors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/02—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point using Joule-Thompson effect; using vortex effect
- F25B9/04—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point using Joule-Thompson effect; using vortex effect using vortex effect
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the invention relates to a device for removing oxidizable or combustible particles such as soot from exhaust gases containing such particles.
- Hot smoke contains a lot of soot and is caused by incomplete combustion due to lack of air at high temperatures. It occurs at full load or overload and consists mainly of black soot granules from 0.3 to 0.1 ⁇ m.
- the invention has for its object to provide a device for removing oxidizable or combustible particles from exhaust gases, which can be used in particular as an afterburner in a diesel engine.
- a device according to the main claim is proposed, particularly preferred embodiments being specified in the subclaims.
- Vortex tubes are known per se and can be traced back to works by G. Ranques and R. Hilsch.
- a pressurized gas is blown in tangentially, which is divided into two sides of the tube and exits through covers at the tube ends.
- An axial vortex flow is formed.
- Hot gas emerges from one end of the vortex tube due to adiabatic compression.
- At the other end of the vortex tube there is an adiabatic expansion through the nozzle, so that cold gas escapes there.
- Such a device is described, for example, in connection with a compressed air blowing device according to DE-OS 36 00 147, in order to inflate cold air onto workpieces.
- soot particles get a high rotational speed due to the tangential inflow in a kind of cyclone effect, which throws them against the pipe wall, and are heated to more than the ignition point for soot because of the temperature increase.
- the gases cleaned in the middle of the tube due to the cyclone effect leave this through the orifice.
- the rest, including the erosion, leaves the tube through the throttle.
- the inner surface of the tube is coated with a catalyst.
- Figure 1 is a schematic representation of an exemplary embodiment in connection with a diesel engine
- Figure 2 shows a section through a vortex tube
- Figure 3 shows a section along the line A-A through Figure 2.
- Figure 4 shows a section along the line B-B through the vortex tube.
- FIG. 1 shows a swirl tube 2 connected to a diesel engine 1.
- the diesel engine 1 is only shown schematically, namely in section through its cylinder head.
- the person skilled in the art recognizes the piston, the injection nozzle, the exhaust valve and finally the exhaust manifold 14 to which an exhaust pipe 15 is flanged.
- the exhaust pipe 15 has a damping container 22, which serves to absorb pressure surges of the exhaust gases which are expelled in batches.
- a damping container 22 is not always necessary. Simple tests by a person skilled in the art show whether this should be provided in connection with the device according to the invention. It is pointed out that the exhaust pipe 15 with its damping container 22 is only shown schematically.
- the end of the exhaust pipe 15 remote from the diesel engine 1 merges into an annular chamber 20 in which one end of a swirl tube 2 is accommodated.
- the vortex tube 2 is also only in this illustration schematically indicated, insofar as it is necessary for an understanding of its function. Details of the vortex tube 2 can be found in FIGS. 2-4.
- the vortex tube 2 generally has a length of 10 cm - 20 cm and a diameter of 2 cm - 4 cm, preferably 3 cm. It is expedient if the ratio of tube length to diameter is 10: 1 to 20: 1 and preferably 15: 1.
- the vortex tube 2 is provided with a nozzle ring 10, which blocks a diaphragm 4 that leaves the cross section open except for a central opening 3.
- the exhaust gases from the exhaust line 15 are introduced tangentially into the nozzle ring, so that they set up a helical eddy current therein, which extends over the entire axial length of the vortex tube 2.
- the end 8 of the vortex tube 2 facing away from the nozzle ring 10 is largely open and only has a current stabilizer 6 through which the eddy current can escape. The current stabilizer 6 will be discussed later in connection with FIG. 4.
- the adiabatic compression of the exhaust gases in the vortex tube 2 results in a temperature increase of up to approximately 100 ° C., so that 2 hot exhaust gases emerge from the current stabilizer 6 at the lower end 8 of the vortex tube.
- adiabatic expansion of the exhaust gases takes place at the orifice 4, which leads to a cooling of the gas flow.
- an exhaust gas flow of 5 - 10 bar pressure which is introduced into the nozzle ring 10 with an inlet temperature of + 20 ° C, 2 cold air of + 15 ° C with closed throttle, and down to -40 ° C at the cold end of the vortex tube Exit partially opened throttle.
- FIGS. 2 and 3 show details of the vortex tube 2 from FIG. 1.
- the upper part shows the annular chamber 20 which surrounds the cold end of the vortex tube 2.
- the annular chamber 20 is in Figure 3 shown in section.
- the annular chamber 20 has a square cross section with an axial bore 11 into which the vortex tube 2 is inserted.
- the annular chamber 20 also has an inlet 13 through which the hot exhaust gases from the diesel engine 1 can flow.
- the annular chamber 20 is connected to the exhaust pipe 15 according to FIG. 1, expediently via a screw or clamp connection known per se.
- Inserted into the annular chamber 20 is the nozzle ring 10 which can be seen in FIGS. 2 and 3 and which has four tangential bores 5 in the embodiment shown.
- the holes 5 pass through the entire wall thickness of the nozzle ring 10.
- the outer diameter of the nozzle ring 10 is significantly smaller than the inner diameter of the axial bore 11 of the annular chamber 20, so that it forms an annular space 21 which surrounds the nozzle ring 10.
- Exhaust gases flowing through the inlet 13 therefore first enter the annular space 21 and flow tangentially through the bore 5 into the interior of the vortex tube 2, their impulse causing a helical vortex movement along the length of the vortex tube 2.
- the exhaust gases and in particular the solid particles contained therein, such as soot particles are thrown outwards against the wall of the vortex tube 2.
- Adiabatic compression takes place in the interior of the vortex tube 2, which leads to a temperature increase of up to approximately 100.degree. If the incoming diesel exhaust gases have a temperature of approximately 500 ° C., this results in a temperature of 600 ° C. in the interior of the vortex tube 2, which is sufficient to burn the soot particles.
- the combustion takes place, among other things, because there is normally a sufficiently high excess of oxygen inside the vortex tube 2 when using diesel exhaust gases. If this is not sufficient, additional air supply channels can be provided which lead radially into the interior of the vortex tube 2. However, they are not shown in the illustrated embodiment. In the embodiment shown in FIG.
- the nozzle ring 10 is held by an orifice 4, in that the end face surrounding the orifice opening 3 is turned outwards and thus forms an annular shoulder on which the nozzle ring 10 rests.
- the aperture 4 also has a cylinder 7, which forms the outer wall of a conically widening nozzle.
- a closure piece 9 is inserted over the cylinder 7 and is screwed with an external thread 17 into the wall of the annular chamber 20, which of course has a corresponding internal thread for this purpose. In this way, the closure piece 9 centers the diaphragm 4 and the nozzle ring 10 placed thereon both with respect to the vortex tube 2 and with respect to the annular chamber 20.
- FIG. 4 is explained in connection with the lower end of the vortex tube 2.
- a current stabilizer 6, which has the shape of a cross, is inserted into the lower end of the vortex tube 2.
- the cross is formed by two mutually perpendicular partition walls, the length of which corresponds approximately to the diameter of the vortex tube 2.
- four axially extending chambers are formed at the lower, hot end 8 of the vortex tube, which deflect the helical eddy current into an axially parallel flow.
- a throttle neck 16 is also placed, which has a throttle opening 18 that somewhat reduces the cross section of the vortex tube 2.
- the throttle opening 18 is an annular shoulder with conical contact surfaces on the outside, onto which a throttle piece 12 can be placed and removed therefrom. By moving the throttle piece 12 in the direction of the current stabilizer 6 the exhaust gas flow throttled. This allows the temperature of the exhaust gas stream emerging from the aperture 3 to be set.
- the outer wall of the vortex tube 2 can be surrounded by a heat insulation layer, so that the temperature increase of approximately 100 ° C. is reliably established.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Exhaust Gas After Treatment (AREA)
- Cyclones (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002033345A CA2033345C (en) | 1989-06-01 | 1990-05-30 | Arrangement for removing oxidizable or combustible particles from exhaust gases |
AT90908502T ATE100526T1 (de) | 1989-06-01 | 1990-05-30 | Vorrichtung zum entfernen oxidierbarer bzw. verbrennbarer partikel aus abgasen. |
BR909006787A BR9006787A (pt) | 1989-06-01 | 1990-05-30 | Dispositivo para a remocao de particulas oxidaveis ou tambem particulas combustiveis de gases de descarga |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP3917888.9 | 1989-06-01 | ||
DE3917888A DE3917888A1 (de) | 1989-06-01 | 1989-06-01 | Vorrichtung zum entfernen oxidierbarer bzw. verbrennbarer partikel aus abgasen |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1990015228A1 true WO1990015228A1 (de) | 1990-12-13 |
Family
ID=6381856
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1990/000864 WO1990015228A1 (de) | 1989-06-01 | 1990-05-30 | Vorrichtung zum entfernen oxidierbarer bzw. verbrennbarer partikel aus abgasen |
Country Status (8)
Country | Link |
---|---|
US (1) | US5193341A (de) |
EP (1) | EP0431105B1 (de) |
JP (1) | JPH04501161A (de) |
BR (1) | BR9006787A (de) |
CA (1) | CA2033345C (de) |
DE (2) | DE3917888A1 (de) |
ES (1) | ES2051516T3 (de) |
WO (1) | WO1990015228A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1992014042A1 (en) * | 1991-02-08 | 1992-08-20 | Soleco S.R.L. Soluzioni Ecologiche | Thermal destruction process for eliminating pollutants from diesel engine emissions |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE29520315U1 (de) * | 1995-12-21 | 1997-04-17 | Sibbertsen, Walter, Prof., 22549 Hamburg | Vorrichtung zum Abschneiden von Staub u.dgl. aus einem Gas |
US6379411B1 (en) * | 2000-04-26 | 2002-04-30 | Bechtel Bwxt Idaho, Llc | Two stroke engine exhaust emissions separator |
US6895752B1 (en) * | 2003-10-31 | 2005-05-24 | Caterpillar Inc | Method and apparatus for exhaust gas recirculation cooling using a vortex tube to cool recirculated exhaust gases |
US8715378B2 (en) | 2008-09-05 | 2014-05-06 | Turbulent Energy, Llc | Fluid composite, device for producing thereof and system of use |
US9310076B2 (en) | 2007-09-07 | 2016-04-12 | Turbulent Energy Llc | Emulsion, apparatus, system and method for dynamic preparation |
US9708185B2 (en) * | 2007-09-07 | 2017-07-18 | Turbulent Energy, Llc | Device for producing a gaseous fuel composite and system of production thereof |
US9144774B2 (en) * | 2009-09-22 | 2015-09-29 | Turbulent Energy, Llc | Fluid mixer with internal vortex |
WO2009042372A1 (en) | 2007-09-25 | 2009-04-02 | Concord Materials Technologies Llc | Foaming of liquids |
JP2009081301A (ja) * | 2007-09-26 | 2009-04-16 | Toyo Tanso Kk | 太陽電池ユニット |
US20110056457A1 (en) * | 2008-05-12 | 2011-03-10 | Turbulent Energy, Inc. | System and apparatus for condensation of liquid from gas and method of collection of liquid |
JP5056798B2 (ja) | 2009-06-08 | 2012-10-24 | 日本電気株式会社 | 判定装置、指紋入力装置、判定方法および判定プログラム |
US8844495B2 (en) * | 2009-08-21 | 2014-09-30 | Tubulent Energy, LLC | Engine with integrated mixing technology |
US10359009B1 (en) * | 2013-03-14 | 2019-07-23 | Eckert Engine Company | Heat exchanger for engine |
US20160158900A1 (en) * | 2014-12-03 | 2016-06-09 | Universal Vortex Inc. | Vortex Tube |
US9840413B2 (en) | 2015-05-18 | 2017-12-12 | Energyield Llc | Integrated reformer and syngas separator |
US9843062B2 (en) | 2016-03-23 | 2017-12-12 | Energyield Llc | Vortex tube reformer for hydrogen production, separation, and integrated use |
US11493239B2 (en) | 2018-09-28 | 2022-11-08 | Universal Vortex, Inc. | Method for reducing the energy necessary for cooling natural gas into liquid natural gas using a non-freezing vortex tube as a precooling device |
CN114377532A (zh) * | 2021-12-10 | 2022-04-22 | 南京玻璃纤维研究设计院有限公司 | 用于岩棉冲天炉烟气脱硫脱硝的一体化处理装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1476588A1 (de) * | 1966-07-19 | 1969-03-13 | Ott Dr Med Dent Walter | Der Atmosphaere vorgeschaltete Entgiftungs-und Schalldaempfungsvorrichtung |
US3577728A (en) * | 1969-03-19 | 1971-05-04 | Joe W Von Brimer | Exhaust gas processing system |
US3892070A (en) * | 1970-05-08 | 1975-07-01 | Ranendra K Bose | Automobile anti-air pollution device |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2833615A (en) * | 1952-10-03 | 1958-05-06 | Houdry Process Corp | Abatement of smog in flue gases |
US3019780A (en) * | 1957-12-12 | 1962-02-06 | James M Nuding | Gas purifying arrangement |
US3566610A (en) * | 1968-09-23 | 1971-03-02 | Cosmo Dominic Fiore | Method and apparatus for separating fluids |
US3861142A (en) * | 1973-02-05 | 1975-01-21 | Ranendra K Bose | Anti-pollution systems for automobiles |
DE2734010A1 (de) * | 1977-07-28 | 1979-02-15 | Degussa | Abgasreinigungseinrichtung fuer eine brennkraftmaschine von fahrzeugen, insbesondere kraftfahrzeugen |
DE3504299A1 (de) * | 1985-02-08 | 1986-08-14 | Robert Bosch Gmbh, 7000 Stuttgart | Vorrichtung zum verbrennen von aus dem abgas von brennkraftmaschinen abgetrennten festkoerperpartikeln, insbesondere russteilchen |
-
1989
- 1989-06-01 DE DE3917888A patent/DE3917888A1/de not_active Withdrawn
-
1990
- 1990-05-30 ES ES90908502T patent/ES2051516T3/es not_active Expired - Lifetime
- 1990-05-30 EP EP90908502A patent/EP0431105B1/de not_active Expired - Lifetime
- 1990-05-30 DE DE90908502T patent/DE59004330D1/de not_active Expired - Fee Related
- 1990-05-30 WO PCT/EP1990/000864 patent/WO1990015228A1/de active IP Right Grant
- 1990-05-30 JP JP2507953A patent/JPH04501161A/ja active Pending
- 1990-05-30 CA CA002033345A patent/CA2033345C/en not_active Expired - Fee Related
- 1990-05-30 US US07/646,603 patent/US5193341A/en not_active Expired - Fee Related
- 1990-05-30 BR BR909006787A patent/BR9006787A/pt unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1476588A1 (de) * | 1966-07-19 | 1969-03-13 | Ott Dr Med Dent Walter | Der Atmosphaere vorgeschaltete Entgiftungs-und Schalldaempfungsvorrichtung |
US3577728A (en) * | 1969-03-19 | 1971-05-04 | Joe W Von Brimer | Exhaust gas processing system |
US3892070A (en) * | 1970-05-08 | 1975-07-01 | Ranendra K Bose | Automobile anti-air pollution device |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1992014042A1 (en) * | 1991-02-08 | 1992-08-20 | Soleco S.R.L. Soluzioni Ecologiche | Thermal destruction process for eliminating pollutants from diesel engine emissions |
Also Published As
Publication number | Publication date |
---|---|
BR9006787A (pt) | 1991-08-06 |
DE59004330D1 (de) | 1994-03-03 |
DE3917888A1 (de) | 1990-12-06 |
EP0431105B1 (de) | 1994-01-19 |
CA2033345C (en) | 2000-07-18 |
US5193341A (en) | 1993-03-16 |
ES2051516T3 (es) | 1994-06-16 |
JPH04501161A (ja) | 1992-02-27 |
CA2033345A1 (en) | 1990-12-02 |
EP0431105A1 (de) | 1991-06-12 |
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