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US20040056234A1 - Method of producing homogeneous gas mixtures - Google Patents

Method of producing homogeneous gas mixtures Download PDF

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Publication number
US20040056234A1
US20040056234A1 US10/603,081 US60308103A US2004056234A1 US 20040056234 A1 US20040056234 A1 US 20040056234A1 US 60308103 A US60308103 A US 60308103A US 2004056234 A1 US2004056234 A1 US 2004056234A1
Authority
US
United States
Prior art keywords
gas mixture
gas
buffer tank
compressor
homogeneous
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.)
Abandoned
Application number
US10/603,081
Other languages
English (en)
Inventor
Heinz-Joachim Belt
Michael Pittroff
Thomas Schwarze
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.)
Solvay Fluor GmbH
Original Assignee
Solvay Fluor und Derivate GmbH
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 Solvay Fluor und Derivate GmbH filed Critical Solvay Fluor und Derivate GmbH
Assigned to SOLVAY FLUOR UND DERIVATE GMBH reassignment SOLVAY FLUOR UND DERIVATE GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BELT, HEINZ-HOACHIM, PITTROFF, MICHAEL, SCHWARZE, THOMAS
Publication of US20040056234A1 publication Critical patent/US20040056234A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/10—Mixing gases with gases
    • B01F23/19—Mixing systems, i.e. flow charts or diagrams; Arrangements, e.g. comprising controlling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2215/00—Auxiliary or complementary information in relation with mixing
    • B01F2215/04—Technical information in relation with mixing
    • B01F2215/0413—Numerical information
    • B01F2215/0436—Operational information
    • B01F2215/044—Numerical composition values of components or mixtures, e.g. percentage of components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2215/00—Auxiliary or complementary information in relation with mixing
    • B01F2215/04—Technical information in relation with mixing
    • B01F2215/0413—Numerical information
    • B01F2215/0436—Operational information
    • B01F2215/045—Numerical flow-rate values
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2215/00—Auxiliary or complementary information in relation with mixing
    • B01F2215/04—Technical information in relation with mixing
    • B01F2215/0413—Numerical information
    • B01F2215/0436—Operational information
    • B01F2215/0468—Numerical pressure values
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/60—Pump mixers, i.e. mixing within a pump
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/50—Movable or transportable mixing devices or plants
    • B01F33/502—Vehicle-mounted mixing devices

Definitions

  • the invention relates to a method for producing substantially homogeneous, compressed gas mixtures which contain perfluorinated and/or partially fluorinated hydrocarbons, and to a mixing station, in particular a mobile one, usable therein.
  • Such gas mixtures can be used, for example, as insulating gas for current-carrying underground cables or in gas-insulated circuits.
  • a particular problem in this case is that the gas mixtures (which are required in very large quantities) expediently need to be produced on the spot. For if it were desired to use gas mixtures prefabricated in a factory, these would have to be transported in gas cylinders under high pressure, in order to keep the transportation costs as low as possible; however, this is not possible, since then the content of fluorinated hydrocarbons condenses out and corresponding demixing would occur.
  • Another object of the present invention is to provide a mixing station which can be used for this purpose, in particular a mobile mixing station which can be used for this purpose.
  • a further object is to provide a mixing station which is protected from dirt and the effects of the weather.
  • a method for producing a homogeneous compressed gas mixture comprising premixing separately supplied gases to form a non-homogeneous gas mixture; passing the non-homogeneous gas mixture into a static mixer or a buffer tank; conveying the gas mixture from the mixer or buffer tank into a compressor; compressing the gas mixture in the compressor; and withdrawing a substantially homogeneous compressed gas mixture from the compressor; wherein said gas mixture comprises at least one perfluorinated or partially fluorinated hydrocarbon or ether.
  • the gas mixture further comprises at least one gas selected from the group consisting of SF 6 and inert gases, such as noble gases, CO 2 and N 2 .
  • the objects are achieved by providing a mixing station for carrying out the foregoing method.
  • compounds selected from the group consisting of perfluorinated and/or partially fluorinated hydrocarbons are used as fluorinated hydrocarbons for the production of substantially homogeneous compressed gas mixtures from gases which are separately present.
  • Fluorinated compounds within the context of the invention are to be understood to mean perfluorinated and/or partially fluorinated hydrocarbons which can be pressure-liquefied, in particular those compounds which develop a vapour pressure of ⁇ 30 bar (abs.) at 50° C.
  • Suitable representatives of these classes of substances include, for example, R218 (C 3 F 8 ), R125 (CHF 2 CF 3 ), R227ea (CF 3 CHFCF 3 ), R134a (CH 2 FCF 3 ), R143a (CH 3 CF 3 ), R404 (R125/R143a/R134a), R23 (CHF 3 ), R14 (CF 4 ), R116 (CF 3 CF 3 ) or E125 (CF 3 OCHF 2 ).
  • Suitable mixture constituents include, for example, SF 6 , inert gases, e.g. noble gases, CO 2 or N 2 .
  • the method provides for the gases which are supplied separately to be premixed, forming a non-homogeneous gas mixture, the non-homogeneous gas mixture to be passed into a static mixer and/or buffer tank, the gas mixture to be passed from the buffer tank or the static mixer into a compressor, and a substantially homogeneous compressed gas mixture to be delivered from the compressor, wherein, if a buffer tank is provided, a portion of the substantially homogeneous compressed gas mixture delivered from the compressor is returned into the buffer tank via a return line.
  • the method according to the invention makes it possible to produce homogeneously mixed gas mixtures at the point of use. It is therefore no longer necessary to supply gas mixtures homogeneously mixed ex works. Another advantage is that high flow rates (for example above 200 standard m 3 per hour) can be processed. In this case, the degree of mixing is independent of the cross-sections of the lines used. Metered delivery of the final homogeneous gas mixture is possible.
  • the method is performed using a buffer tank, and a control valve is installed in the return line.
  • the return of a portion of the gas mixture is adjusted to the desired value with this control valve.
  • This embodiment has the advantage that the compressor can be operated under gas ballast, and in addition the thorough mixing is improved still further.
  • the control valve may, for example, be adjusted such that a predetermined proportion of the volume of the compressed gas delivered from the compressor is returned.
  • a safety means which registers the fact that the filling limit has been reached in the electric cable which is to be filled or the gas cylinder which is to be filled, and switches off the compressor.
  • This may, for example, be a pressure-relief valve, which from a predetermined pressure onwards opens and advantageously turns off the compressor.
  • the pressure-relief line may be connected to the buffer tank. In this manner, the gas released through the pressure relief valve remains in circulation.
  • the compressor is adjusted such that it supplies a gas mixture having the desired pressure.
  • the aforementioned gas mixtures are advantageously delivered at a pressure of 1 to 13 bar absolute.
  • the pressure is in the range from 4 to 9 bar absolute.
  • Compressors which operate without oil, in particular diaphragm compressors, but also piston compressors, are advantageously used.
  • the quantities of gas which are supplied to form gas mixtures of given composition are preferably controlled via mass flow meters. This is advantageous precisely for gases with a high difference in density; the quantities of gas may be controlled accurately despite variable temperatures (influence of the time of day or year).
  • the method according to the invention can be used for the production of mixtures from gases in which at least one gas constituent is pressure-liquefied.
  • gases in which at least one gas constituent is pressure-liquefied.
  • CHF 2 CF 3 , CF 3 CF 3 , C 3 F 8 , CH 2 FCF 3 , CH 3 CF 3 , CF 3 CHFCF 3 or SF 6 are used as pressure-liquefiable gases.
  • the method is particularly well suited for producing homogeneous gas mixtures which contain or consist of CF 4 , CHF 2 CF 3 , CF 3 CF 3 , C 3 F 8 and N 2 or SF 6 .
  • gas mixtures are used for example as an insulating gas for current-carrying underground cables or in gas-insulated circuits.
  • gas-insulated switchgear or in gas-insulated circuits the gas mixtures according to the invention are preferably used in areas in which no arcs are produced.
  • the method according to the invention is particularly well suited for the production of substantially homogeneous compressed gas mixtures.
  • the desired content of the gas mixture in a sample taken deviates by at most ⁇ 0.7% by volume from the value which occurs with ideal thorough mixing (i.e., ideal homogeneity).
  • the proportion of the already-mixed gas returned to the buffer tank via the return line is increased.
  • the analysis may be by e.g. gas chromatography.
  • the composition of the gas mixtures may vary within a wide range.
  • homogeneous gas mixtures can be manufactured which contain 5 to 95% by volume, preferably 40 to 90% by volume, in particular 50 to 95% by volume, of perfluorinated and/or partially fluorinated hydrocarbons. The remainder to make up to 100 % by volume is accordingly the other constituent such as SF 6 or an inert gas, preferably N 2 .
  • One preferred embodiment of the method according to the invention provides for a gas mixture containing or consisting of perfluorinated and/or partially fluorinated hydrocarbons and N 2 to be produced and for this to be introduced as an insulating gas into current-carrying underground cables or gas-insulated switchgear.
  • the invention also relates to a mixing station which can be used to perform the method according to the invention to produce gas mixtures with perfluorinated hydrocarbons and substantially lighter gases.
  • This mixing station comprises the following components: at least two feed lines for feeding the gases to be mixed; a gas line for jointly passing on the premixed gases; a stationary mixer and/or a buffer tank into which the gas line for jointly passing on the premixed gases opens; a gas line which is connected to the buffer tank or stationary mixer and a compressor, through which gas mixture is passed from the buffer tank or the stationary mixer into the compressor; a compressor in which the gas mixture carried off from the buffer tank or stationary mixer is compressed and homogenised; a removal line for carrying the homogeneous compressed gas mixture out of the compressor.
  • the mixing apparatus may also comprise a return line connected between the removal line from the compressor and the buffer tank, and a control valve in the return line.
  • the feed lines for the gases to be mixed may be connected via a T-type connector to the gas line for jointly passing on the gases.
  • One preferred embodiment of the mixing station has a buffer tank and a return line with control valve.
  • FIG. 1 is a schematic illustration of a simple mixing station for carrying out the method of the invention.
  • FIG. 2 is a schematic diagram illustrating how the method of the invention is carried out.
  • FIG. 1 shows a simple mixing station which comprises two feed lines ( 1 , 2 ); two valves ( 3 , 4 ) for regulating the gas flow rate; a gas line ( 5 ) for passing on the premixed gases; a buffer tank ( 6 ); a compressor ( 7 ); a gas line ( 8 ) between the buffer tank ( 6 ) and the compressor ( 7 ); a removal line ( 9 ); a return line ( 10 ) between the buffer tank and the compressor; a control valve ( 11 ) in the return line; and a valve ( 12 ) for regulating the quantity of the homogeneous gas mixture removed.
  • the mixing station may comprise further useful components such as one or more manometers, pressure reducers, flow meters, pressure-relief valves, automatic shut-off means for the compressor, removal points for taking samples or a removal point for the homogeneous gas mixture.
  • the device comprises mass flow meters in order to regulate the quantities of gas.
  • a collecting device of this type delivers accurate results independently of the temperature (time of day, time of year) at which it is operated—despite the high differences in gas density.
  • the mixing station may furthermore comprise: at least one holder for holding gas cylinders for one or more of the unmixed gases; a connection for connecting a gas cylinder for receiving the homogeneous compressed gas mixture; and/or at least one holder for such a gas cylinder.
  • It may furthermore comprise means for protecting from external influences.
  • fittings with a tarpaulin may be provided, which keep dirt and the effects of the weather away from it.
  • the mixing station may be mobile. It then comprises the mixing station described above and an undercarriage on which the mixing station is mounted.
  • the undercarriage may be a truck or a trailer. This has the advantage that the mixing station can be moved along with the laying of underground cables to be insulated.
  • the fluorinated hydrocarbons and nitrogen are introduced into a gas mixer (G) from the tank (ST) or the nitrogen tank (NT) via evaporators (V), manometers (M) and pressure reducers (D).
  • the pressure between the manometer and the pressure reducer is 9 to 15 bar.
  • the two gases are introduced into a common line ( 5 ) via mass flow meters and butterfly valves.
  • the differential pressure between (M) and the static mixer (F) is at least 3 bar.
  • the premixed gas is introduced into the buffer tank ( 6 ) via the static mixer (F) and is introduced from the buffer tank via line ( 8 ) into the compressor ( 7 ).
  • a portion of the gas removed from the compressor via line ( 9 ) is returned into the buffer tank via line ( 10 ) and the control valve ( 11 ).
  • the pressure in the line ( 9 ) may range up to 13 bar (i.e. 14 bar absolute). Gas samples can be taken for analysis via the sampling points ( 13 , 13 ′) and ( 13 ′′).
  • the flow rate in line ( 9 ) is from 5 to 250 standard m 3 per hour.
  • Homogeneous gas mixture is introduced into a gas cylinder, not shown here, via line ( 9 ).
  • the control valve ( 11 ) is set such that the desired degree of thorough mixing is achieved—the greater the volume percent which is recycled to the buffer tank, the more ideal the thorough mixing, but of course also the lower the quantity of compressed gas mixture delivered.
  • the compressed gas is delivered via the shut-off valve ( 14 ) to the article to be filled (e.g. an electric cable, switch housing or a gas cylinder).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Gas-Insulated Switchgears (AREA)
  • Accessories For Mixers (AREA)
  • Installation Of Bus-Bars (AREA)
US10/603,081 2002-06-28 2003-06-25 Method of producing homogeneous gas mixtures Abandoned US20040056234A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10229041A DE10229041A1 (de) 2002-06-28 2002-06-28 Herstellung homogener Gasgemische
DE10229041.5 2002-06-28

Publications (1)

Publication Number Publication Date
US20040056234A1 true US20040056234A1 (en) 2004-03-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
US10/603,081 Abandoned US20040056234A1 (en) 2002-06-28 2003-06-25 Method of producing homogeneous gas mixtures

Country Status (4)

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US (1) US20040056234A1 (de)
EP (1) EP1374981A3 (de)
JP (1) JP2004098051A (de)
DE (1) DE10229041A1 (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060285429A1 (en) * 2003-04-07 2006-12-21 Shinobu Kamimura Fluid mixer
US20100000609A1 (en) * 2007-02-06 2010-01-07 Brian Arthur Goody Fluid mixtures
WO2012121906A1 (en) * 2011-03-10 2012-09-13 Praxair Technology, Inc. Dynamic gas blending
CN103566840A (zh) * 2013-11-04 2014-02-12 浙江大学 高倍稀释的pm2.5气溶胶发生系统及其方法
US8680421B2 (en) 2009-06-12 2014-03-25 Abb Technology Ag Encapsulated switchgear
US8709303B2 (en) 2010-12-14 2014-04-29 Abb Research Ltd. Dielectric insulation medium
US8822870B2 (en) 2010-12-14 2014-09-02 Abb Technology Ltd. Dielectric insulation medium
US8916059B2 (en) 2009-06-17 2014-12-23 Abb Technology Ag Fluorinated ketones as high-voltage insulating medium
US9172221B2 (en) 2011-12-13 2015-10-27 Abb Technology Ag Converter building
US20150318079A1 (en) * 2012-12-21 2015-11-05 Solvay Sa A method for dielectrically insulating active electric parts
US9257213B2 (en) 2010-12-16 2016-02-09 Abb Technology Ag Dielectric insulation medium
CN106064026A (zh) * 2016-07-26 2016-11-02 液化空气（中国）研发有限公司 多元气体混配系统
CN107726043A (zh) * 2017-09-08 2018-02-23 国家电网公司 一种110kV六氟化硫气体绝缘电流互感器的混合气体改造方法
CN118079687A (zh) * 2024-04-28 2024-05-28 合肥先微半导体材料有限公司 一种氟碳气体混合的补气装置

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JP4864626B2 (ja) * 2006-09-28 2012-02-01 株式会社東芝 ガス絶縁開閉器
FR2936038B1 (fr) * 2008-09-16 2011-01-07 Air Liquide Installation miniaturisee de fabrication de melanges de gaz speciaux.
ITMI20131292A1 (it) * 2013-07-31 2015-02-01 Eng Service S R L Apparato compressore ermetico oil-less
AT521176B1 (de) * 2018-08-28 2019-11-15 Avl List Gmbh Gasmischvorrichtung zur Linearisierung oder Kalibrierung von Gasanalysatoren
CN111346531B (zh) * 2020-03-03 2022-04-15 国机铸锻机械有限公司 一种双回路双工位镁合金低压铸造混气工艺及其装置

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US4296003A (en) * 1980-06-27 1981-10-20 Electric Power Research Institute, Inc. Atomized dielectric fluid composition with high electrical strength
US5145514A (en) * 1984-11-08 1992-09-08 Alcan International Limited Treating aluminium with chlorine
US5562861A (en) * 1993-03-05 1996-10-08 Ikon Corporation Fluoroiodocarbon blends as CFC and halon replacements
US5667728A (en) * 1996-10-29 1997-09-16 Sealed Air Corporation Blowing agent, expandable composition, and process for extruded thermoplastic foams
US6105631A (en) * 1996-11-28 2000-08-22 Solvay Fluor Und Derivate Gmbh Preparation of homogeneous gas mixtures with SF6
US6372700B1 (en) * 2000-03-31 2002-04-16 3M Innovative Properties Company Fluorinated solvent compositions containing ozone

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Publication number Priority date Publication date Assignee Title
US2411759A (en) * 1944-02-04 1946-11-26 Samuel Harry White Gas mixture
US3330773A (en) * 1963-03-28 1967-07-11 Du Pont Process for preparing gaseous mixtures
US3464927A (en) * 1965-07-09 1969-09-02 Alsacienne Atom Gaseous mixture
US4052555A (en) * 1975-07-23 1977-10-04 Allied Chemical Corporation Gaseous dielectric compositions
US4255124A (en) * 1978-10-05 1981-03-10 Baranowski Jr Frank Static fluid-swirl mixing
US4239396A (en) * 1979-01-25 1980-12-16 Condor Engineering & Manufacturing, Inc. Method and apparatus for blending liquids and solids
US4296003A (en) * 1980-06-27 1981-10-20 Electric Power Research Institute, Inc. Atomized dielectric fluid composition with high electrical strength
US5145514A (en) * 1984-11-08 1992-09-08 Alcan International Limited Treating aluminium with chlorine
US5562861A (en) * 1993-03-05 1996-10-08 Ikon Corporation Fluoroiodocarbon blends as CFC and halon replacements
US5667728A (en) * 1996-10-29 1997-09-16 Sealed Air Corporation Blowing agent, expandable composition, and process for extruded thermoplastic foams
US6105631A (en) * 1996-11-28 2000-08-22 Solvay Fluor Und Derivate Gmbh Preparation of homogeneous gas mixtures with SF6
US6372700B1 (en) * 2000-03-31 2002-04-16 3M Innovative Properties Company Fluorinated solvent compositions containing ozone

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060285429A1 (en) * 2003-04-07 2006-12-21 Shinobu Kamimura Fluid mixer
US7810988B2 (en) * 2003-04-07 2010-10-12 Asahi Organic Chemicals Industry Co., Ltd. Fluid mixer for mixing fluids at an accurate mixing ratio
US20100000609A1 (en) * 2007-02-06 2010-01-07 Brian Arthur Goody Fluid mixtures
US9928973B2 (en) 2009-06-12 2018-03-27 Abb Technology Ag Dielectric insulation medium
US9196431B2 (en) 2009-06-12 2015-11-24 Abb Technology Ag Encapsulated switchgear
US8680421B2 (en) 2009-06-12 2014-03-25 Abb Technology Ag Encapsulated switchgear
US8704095B2 (en) 2009-06-12 2014-04-22 Abb Technology Ag Dielectric insulation medium
US8916059B2 (en) 2009-06-17 2014-12-23 Abb Technology Ag Fluorinated ketones as high-voltage insulating medium
US8822870B2 (en) 2010-12-14 2014-09-02 Abb Technology Ltd. Dielectric insulation medium
US8709303B2 (en) 2010-12-14 2014-04-29 Abb Research Ltd. Dielectric insulation medium
US9257213B2 (en) 2010-12-16 2016-02-09 Abb Technology Ag Dielectric insulation medium
WO2012121906A1 (en) * 2011-03-10 2012-09-13 Praxair Technology, Inc. Dynamic gas blending
US9172221B2 (en) 2011-12-13 2015-10-27 Abb Technology Ag Converter building
US20150318079A1 (en) * 2012-12-21 2015-11-05 Solvay Sa A method for dielectrically insulating active electric parts
US10283234B2 (en) * 2012-12-21 2019-05-07 Solvay Sa Method for dielectrically insulating active electric parts
CN103566840A (zh) * 2013-11-04 2014-02-12 浙江大学 高倍稀释的pm2.5气溶胶发生系统及其方法
CN106064026A (zh) * 2016-07-26 2016-11-02 液化空气（中国）研发有限公司 多元气体混配系统
CN107726043A (zh) * 2017-09-08 2018-02-23 国家电网公司 一种110kV六氟化硫气体绝缘电流互感器的混合气体改造方法
CN118079687A (zh) * 2024-04-28 2024-05-28 合肥先微半导体材料有限公司 一种氟碳气体混合的补气装置

Also Published As

Publication number Publication date
EP1374981A2 (de) 2004-01-02
JP2004098051A (ja) 2004-04-02
EP1374981A3 (de) 2004-04-28
DE10229041A1 (de) 2004-01-22

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AS Assignment

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