ATE102335T1 - Lufttrennung. - Google Patents

Lufttrennung.

Info

Publication number
ATE102335T1
ATE102335T1 AT90305936T AT90305936T ATE102335T1 AT E102335 T1 ATE102335 T1 AT E102335T1 AT 90305936 T AT90305936 T AT 90305936T AT 90305936 T AT90305936 T AT 90305936T AT E102335 T1 ATE102335 T1 AT E102335T1
Authority
AT
Austria
Prior art keywords
nitrogen
stream
air separation
fluid
temperature
Prior art date
Application number
AT90305936T
Other languages
English (en)
Inventor
Thomas Rathbone
Original Assignee
Boc Group Plc
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=10657976&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=ATE102335(T1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Boc Group Plc filed Critical Boc Group Plc
Application granted granted Critical
Publication of ATE102335T1 publication Critical patent/ATE102335T1/de

Links

Classifications

    • 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
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • 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
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
    • F25J3/04527—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general
    • F25J3/04539—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general for the H2/CO synthesis by partial oxidation or oxygen consuming reforming processes of fuels
    • 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
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/0429—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of feed air, e.g. used as waste or product air or expanded into an auxiliary column
    • F25J3/04303—Lachmann expansion, i.e. expanded into oxygen producing or low pressure column
    • 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
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04406—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system
    • F25J3/04412—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
    • 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
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
    • F25J3/04527—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general
    • F25J3/04539—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general for the H2/CO synthesis by partial oxidation or oxygen consuming reforming processes of fuels
    • F25J3/04545—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general for the H2/CO synthesis by partial oxidation or oxygen consuming reforming processes of fuels for the gasification of solid or heavy liquid fuels, e.g. integrated gasification combined cycle [IGCC]
    • 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
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
    • F25J3/04527—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general
    • F25J3/04551—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general for the metal production
    • F25J3/04557—Integration with an oxygen consuming unit, e.g. glass facility, waste incineration or oxygen based processes in general for the metal production for pig iron or steel making, e.g. blast furnace, Corex
    • 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
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
    • F25J3/04563—Integration with a nitrogen consuming unit, e.g. for purging, inerting, cooling or heating
    • F25J3/04575—Integration with a nitrogen consuming unit, e.g. for purging, inerting, cooling or heating for a gas expansion plant, e.g. dilution of the combustion gas in a gas turbine
    • F25J3/04581—Hot gas expansion of indirect heated nitrogen
    • 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
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
    • F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
    • F25J3/04612—Heat exchange integration with process streams, e.g. from the air gas consuming unit
    • 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
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/20—Processes or apparatus using separation by rectification in an elevated pressure multiple column system wherein the lowest pressure column is at a pressure well above the minimum pressure needed to overcome pressure drop to reject the products to atmosphere

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Separation Of Gases By Adsorption (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
AT90305936T 1989-06-06 1990-05-31 Lufttrennung. ATE102335T1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB898913001A GB8913001D0 (en) 1989-06-06 1989-06-06 Air separation

Publications (1)

Publication Number Publication Date
ATE102335T1 true ATE102335T1 (de) 1994-03-15

Family

ID=10657976

Family Applications (1)

Application Number Title Priority Date Filing Date
AT90305936T ATE102335T1 (de) 1989-06-06 1990-05-31 Lufttrennung.

Country Status (10)

Country Link
US (1) US5040370A (de)
EP (1) EP0402045B1 (de)
JP (1) JP3188446B2 (de)
KR (1) KR0163351B1 (de)
AT (1) ATE102335T1 (de)
CA (1) CA2018238A1 (de)
DE (1) DE69006921T2 (de)
DK (1) DK0402045T3 (de)
ES (1) ES2049925T3 (de)
GB (1) GB8913001D0 (de)

Families Citing this family (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9111157D0 (en) * 1991-05-23 1991-07-17 Boc Group Plc Fluid production method and apparatus
FR2690711B1 (fr) * 1992-04-29 1995-08-04 Lair Liquide Procede de mise en óoeuvre d'un groupe turbine a gaz et ensemble combine de production d'energie et d'au moins un gaz de l'air.
US5265424A (en) * 1992-08-03 1993-11-30 Thomas Merritt Advanced furnace boiler system in electric power plant
US5459994A (en) * 1993-05-28 1995-10-24 Praxair Technology, Inc. Gas turbine-air separation plant combination
US5467613A (en) * 1994-04-05 1995-11-21 Carrier Corporation Two phase flow turbine
DE4426744A1 (de) 1994-07-28 1996-02-01 Sekurit Saint Gobain Deutsch Höhenverstellbares Seitenfenster für Kraftfahrzeuge
US5669958A (en) * 1996-02-29 1997-09-23 Membrane Technology And Research, Inc. Methane/nitrogen separation process
GB9624819D0 (en) * 1996-11-28 1997-01-15 Air Prod & Chem Use of elevated pressure nitrogen streams to perform work
NO308400B1 (no) * 1997-06-06 2000-09-11 Norsk Hydro As Kraftgenereringsprosess omfattende en forbrenningsprosess
NO308399B1 (no) * 1997-06-06 2000-09-11 Norsk Hydro As Prosess for generering av kraft og/eller varme
US6116027A (en) * 1998-09-29 2000-09-12 Air Products And Chemicals, Inc. Supplemental air supply for an air separation system
US6161386A (en) * 1998-12-23 2000-12-19 Membrane Technology And Research, Inc. Power generation method including membrane separation
US6263659B1 (en) 1999-06-04 2001-07-24 Air Products And Chemicals, Inc. Air separation process integrated with gas turbine combustion engine driver
US6345493B1 (en) 1999-06-04 2002-02-12 Air Products And Chemicals, Inc. Air separation process and system with gas turbine drivers
US6256994B1 (en) 1999-06-04 2001-07-10 Air Products And Chemicals, Inc. Operation of an air separation process with a combustion engine for the production of atmospheric gas products and electric power
US6745573B2 (en) 2001-03-23 2004-06-08 American Air Liquide, Inc. Integrated air separation and power generation process
US6601391B2 (en) 2001-06-19 2003-08-05 Geosol, Inc. Heat recovery
US6619041B2 (en) 2001-06-29 2003-09-16 L'air Liquide - Societe Anonyme A Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude Steam generation apparatus and methods
US6568185B1 (en) 2001-12-03 2003-05-27 L'air Liquide Societe Anonyme A'directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude Combination air separation and steam-generation processes and plants therefore
US7128005B2 (en) * 2003-11-07 2006-10-31 Carter Jr Greg Non-polluting high temperature combustion system
US8065879B2 (en) * 2007-07-19 2011-11-29 L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Thermal integration of oxygen plants
WO2009075897A2 (en) * 2007-12-06 2009-06-18 Brigham Young University Methods and systems for generating power from a turbine using pressurized nitrogen
EP2090335B1 (de) * 2008-02-12 2016-05-04 Zodiac Aerotechnics Sauerstoffatmungsvorrichtung
EP2168635B1 (de) * 2008-09-26 2017-06-28 Zodiac Aerotechnics Sauerstoffatemvorrichtung mit redundanter Signalübermittlung
US8261744B2 (en) 2008-09-26 2012-09-11 Intertechnique, S.A. Oxygen breathing device with redundant signal transmission
EP2351600B1 (de) * 2008-09-26 2017-06-28 Zodiac Aerotechnics Sauerstoffatemvorrichtung mit redundanter Signalübermittlung
CN102392704A (zh) * 2011-06-22 2012-03-28 赵军政 纯氧火力发电机组
DE102011113262A1 (de) 2011-09-13 2013-03-14 Linde Aktiengesellschaft Verfahren und Vorrichtung zur Gewinnung von Drucksauerstoff durch Tieftemperaturzerlegung von Luft
CN102679388A (zh) * 2012-05-22 2012-09-19 赵军政 高效节能环保的纯氧火力发电机组
CN115750017B (zh) * 2022-11-30 2024-05-24 国家电投集团科学技术研究院有限公司 液态空气储能耦合制氨发电***及方法

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Publication number Priority date Publication date Assignee Title
GB189827153A (en) * 1898-12-23 1899-11-18 Edgar Charles Thrupp Invention relating to the Use of Liquefied Air to Produce Compressed Air for Driving Engines on Motor Cars, Tram Cars, or other Locomotives.
GB189917692A (en) * 1899-09-01 1900-03-31 Celeste Joly Improved Means and Apparatus for the Manufacture of Volatile Liquids and the Production of Mechanical Energy.
DE1102122B (de) * 1959-12-09 1961-03-16 Elektrochemisches Kom Bitterfe Verfahren zur Herstellung von wasserfreiem, geschmolzenem Magnesiumchlorid
US3241327A (en) * 1963-12-18 1966-03-22 Fleur Corp Waste heat recovery in air fractionation
US3987632A (en) * 1970-02-27 1976-10-26 Pereda Eugene F Liquid air engine
IL36741A (en) * 1971-04-30 1974-11-29 Zakon T Method for the separation of gaseous mixtures with recuperation of mechanical energy and apparatus for carrying out this method
US3987633A (en) * 1974-04-19 1976-10-26 Ford Jr Sanders Pressurized gas operated engine
DE3408937A1 (de) * 1984-01-31 1985-08-08 BBC Aktiengesellschaft Brown, Boveri & Cie., Baden, Aargau Kombinierte gas-/dampf-kraftwerkanlage
DE3446715A1 (de) * 1984-12-21 1986-06-26 Krupp Koppers GmbH, 4300 Essen Verfahren zur kuehlung von staubfoermige verunreinigungen enthaltendem partialoxidationsgas, das zur verwendung in einem kombinierten gas-dampfturbinenkraftwerk bestimmt ist
ATE34201T1 (de) * 1985-08-05 1988-05-15 Siemens Ag Kombiniertes gas- und dampfturbinenkraftwerk.
GB8706077D0 (en) * 1987-03-13 1987-04-15 Boc Group Plc Power generation
AT389526B (de) * 1988-03-15 1989-12-27 Voest Alpine Ind Anlagen Verfahren zur gewinnung von fluessig-roheisen in einem einschmelzvergaser

Also Published As

Publication number Publication date
JPH0363491A (ja) 1991-03-19
DE69006921T2 (de) 1994-06-09
CA2018238A1 (en) 1990-12-06
EP0402045A1 (de) 1990-12-12
GB8913001D0 (en) 1989-07-26
ES2049925T3 (es) 1994-05-01
DE69006921D1 (de) 1994-04-07
EP0402045B1 (de) 1994-03-02
DK0402045T3 (da) 1994-03-28
JP3188446B2 (ja) 2001-07-16
US5040370A (en) 1991-08-20
KR910000216A (ko) 1991-01-29
KR0163351B1 (ko) 1998-11-16

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