EP0171351B1 - Device for cooling a hot product gas - Google Patents

Device for cooling a hot product gas Download PDF

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Publication number
EP0171351B1
EP0171351B1 EP85730082A EP85730082A EP0171351B1 EP 0171351 B1 EP0171351 B1 EP 0171351B1 EP 85730082 A EP85730082 A EP 85730082A EP 85730082 A EP85730082 A EP 85730082A EP 0171351 B1 EP0171351 B1 EP 0171351B1
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EP
European Patent Office
Prior art keywords
product gas
gas
cooling
insert
wall
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.)
Expired
Application number
EP85730082A
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German (de)
French (fr)
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EP0171351A1 (en
Inventor
Gero Dr. Papst
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.)
Primetals Technologies Austria GmbH
Deutsche Voest Alpine Industrieanlagenbau GmbH
Original Assignee
Voest Alpine Industrienlagenbau GmbH
Deutsche Voest Alpine Industrieanlagenbau 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 Voest Alpine Industrienlagenbau GmbH, Deutsche Voest Alpine Industrieanlagenbau GmbH filed Critical Voest Alpine Industrienlagenbau GmbH
Priority to AT85730082T priority Critical patent/ATE44162T1/en
Publication of EP0171351A1 publication Critical patent/EP0171351A1/en
Application granted granted Critical
Publication of EP0171351B1 publication Critical patent/EP0171351B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
    • F28C3/00—Other direct-contact heat-exchange apparatus
    • F28C3/02—Other direct-contact heat-exchange apparatus the heat-exchange media both being gases or vapours
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/72—Other features
    • C10J3/82—Gas withdrawal means
    • C10J3/84—Gas withdrawal means with means for removing dust or tar from the gas
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/04—Purifying combustible gases containing carbon monoxide by cooling to condense non-gaseous materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S48/00—Gas: heating and illuminating
    • Y10S48/02—Slagging producer

Definitions

  • the invention relates to a device for cooling a hot product gas which contains sticky particles which lose their tackiness on cooling, consisting of a tubular zone in which the product gas is cooled directly by cooling gas and a gas wall being formed in the wall of the tubular zone, which prevents contact of the product gas with the wall.
  • Such a device is known from US-PS-2 971 830.
  • a particle-free protective gas is fed in near the inlet of the tubular zone in such a way that a protective gas layer is formed on the wall of this zone, which prevents contact of the wall with the hot product gas, the protective gas being at the same time a cooling gas.
  • the cooling gas is fed in through an annular insert with a tangentially directed speed component, and through inlets arranged in the radial direction, which lie above the outlets in the annular zone.
  • the outlets are arranged at equal intervals around the circumference of the tubular insert somewhat above its lower end, so that there is an annular region not acted upon by the cooling gas in the direction of flow at the beginning of the critical zone mentioned.
  • the cooling gas is not only blown in countercurrent to the product gas, but is directed around the lower end of an insert, it flows seamlessly through the tubular zone from the lowest end of the insert over the entire endangered length of the wall of the tubular zone.
  • This shows a wall section 1 of a carburetor, in which the product gas is generated.
  • the wall section 1 merges into an outlet connection 2, which forms the tubular zone through which the product gas flows upward out of the gasifier.
  • the product gas entrains particulate substances which are sticky due to the high temperature of the product gas and which only lose their tack after the product gas has cooled.
  • the temperature of the product gas is still so high that there is a risk that the entrained particles, when they hit a solid wall, get caught on it.
  • annular insert 3 within the outlet nozzle 2, which forms a gap 4 between itself and the inner wall of the outlet nozzle 2.
  • this gap 4 is equidistantly distributed over the circumference of the outlet nozzle 2, one or more inlet opening (s) 5 for a cooling gas, which at the same time form a contact between the product gas and the inner wall of the outlet nozzle 2 or the insert 3 preventing gas wall is used.
  • the inlet opening (s) 5 can be connected, for example, to a ring line which is guided around the outlet connection 2.
  • the cooling gas flowing down through the gap 4 prevents the product gas from entering the gap 4 and thus clogging of this gap by the particles contained in the product gas.
  • the cooling gas is directed around the lower end of the insert 3 by the product gas flowing upwards, so that it flows upwards again on the inner surface of the insert 3 parallel to the latter. It forms a continuous gas wall, which prevents the product gas from touching the insert 3.
  • the sticky particles entrained in the product gas can therefore not reach the inner wall of the insert 3 and attach to it.
  • the cooling gas simultaneously causes cooling of the product gas during the passage through the insert 3, so that the product gas has cooled down at the upper outlet of the insert 3 to such an extent that the particles in it have lost their stickiness.
  • This cooling effect is supported in that the insert 3 itself is cooled. It contains for this purpose, for example, cooling channels running in its interior through which water or another suitable cooling medium flows.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Jigs For Machine Tools (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Die Bonding (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)

Abstract

An apparatus for cooling a hot product gas, the latter is passed through a tubular zone. The product gas contains particles which, on entering the tubular zone, are tacky, but lose their tackiness through cooling in said zone. Within said zone a cooling gas flow forms a gas wall, which prevents contact between the product gas or the tacky particles contained therein, and one of the fixed walls in the tubular zone. Thus within an outlet connection (2) forming the tubular zone is provided an anular insert (3), which forms a gap (4) with the outlet connection. A cooling gas is blown into this gap counter to the flow direction of the product gas. At the end of the insert, this cooling gas is deflected by the product gas and flows within the insert in the same direction as the product gas and protects the inner wall of the insert from the latter. This product gas is cooled to such an extent by the action of the cooling gas that the particles in the product gas have lost their tackiness at the outlet-side end of the insert.

Description

Die Erfindung betrifft eine Vorrichtung zum Abkühlen eines heißen Produktgases, das klebrige Teilchen enthält, die ihre Klebrigkeit beim Abkühlen verlieren, bestehend aus einer rohrförmigen Zone in der das Produktgas durch Kühlgas direkt gekühlt wird und wobei in der Wand der röhrenförmigen Zone eine Gaswand gebildet wird, die einen Kontakt des Produktgases mit der Wand verhindert.The invention relates to a device for cooling a hot product gas which contains sticky particles which lose their tackiness on cooling, consisting of a tubular zone in which the product gas is cooled directly by cooling gas and a gas wall being formed in the wall of the tubular zone, which prevents contact of the product gas with the wall.

Eine derartige Vorrichtung ist aus der US-PS-2 971 830 bekannt. Bei dieser Vorrichtung wird nahe am Einlaß der röhrenförmigen Zone ein teilchenfreies Schutzgas auf solche Weise eingespeist, daß dan der Wand dieser Zone eine schützende Gasschicht gebildet wird, die einen Kontakt der Wand mit dem heißen Produktgas verhindert, wobei das Schutzgas gleichzeitig ein Kühlgas ist. Zur Bildung der schützenden Gasschicht wird das Kühlgas durch einen ringförmigen Einsatz mit eienr tangential gerichteten Geschwindigkeitskomponente eingespeist, und durch in radialer Richtung angeordnete Einlässe, die oberhlab der Auslässe in der ringförmigen Zone liegen, zugeführt. Die Auslässe sind in gleichen Abständen um den Umfang des röhrenförmigen Einsatzes etwas oberhalb seines unteren Endes angeordnet, so daß sich ein vom Kühlgas nicht beaufschlagter Ringbereich in Strömungsrichtung am Anfang der genannten kritischen Zone ergibt.Such a device is known from US-PS-2 971 830. In this device, a particle-free protective gas is fed in near the inlet of the tubular zone in such a way that a protective gas layer is formed on the wall of this zone, which prevents contact of the wall with the hot product gas, the protective gas being at the same time a cooling gas. To form the protective gas layer, the cooling gas is fed in through an annular insert with a tangentially directed speed component, and through inlets arranged in the radial direction, which lie above the outlets in the annular zone. The outlets are arranged at equal intervals around the circumference of the tubular insert somewhat above its lower end, so that there is an annular region not acted upon by the cooling gas in the direction of flow at the beginning of the critical zone mentioned.

Bei dieser bekannten Vorrichtung ist der Einfluß auf die Strömung des Kühlgases in der röhrenförmigen Zone durch die Ausströmrichtung beim Eintritt in diese Zone gegeben. Eine durchgehende schützende Gaswand über den gesamten Umfang der röhrenförmigen Zone schient daher nicht immer gewährleistet. Die Vorrichtung ist außerdem relativ aufwendig, da der ringförmige Einsatz genau eingepaßt werden muß und zum Aufbau der schützenden Gaswand der kritische Bereich unterhalb der Austrittsöffnungen des Kühlgases nicht beiträgt.In this known device, the influence on the flow of the cooling gas in the tubular zone is given by the outflow direction when entering this zone. A continuous protective gas wall over the entire circumference of the tubular zone therefore does not always appear to be guaranteed. The device is also relatively expensive, since the annular insert must be precisely fitted and the critical area below the outlet openings of the cooling gas does not contribute to the construction of the protective gas wall.

Es ist daher die Aufgabe der vorliegenden Erfindung, eine Vorrichtung der anfangs genannten Art zu schaffen, bei der eine über die ganze Länge der röhrenförmigen Zone wirksame schützende Gaswand zur Vermeidung eines Kontaktes zwischen dem die klebrigen Teilchen enthaltenden Produktgas und einer festen Wand gebildet wird und die im Aufbau einfach ist.It is therefore the object of the present invention to provide a device of the type mentioned at the beginning, in which a protective gas wall which is effective over the entire length of the tubular zone is formed to avoid contact between the product gas containing the sticky particles and a solid wall and which is simple to set up.

Diese Aufgabe wird erfindungsgemäß durch die im Kennzeichen des Anspruchs 1 angegebenen Merkmale gelöst.This object is achieved by the features specified in the characterizing part of claim 1.

Dadurch, daß das Kühlgas nicht nur im Gegenstrom zum Produktgas eingeblasen wird, sondern um das untere Ende eines Einsatzes herumgelenkt wird, durchströmt es lückenlos die röhrenförmige Zone vom untersten Ende des Einsatzes über die gesamte gefährdete Länge der Wand der röhrenförmigen Zone.Because the cooling gas is not only blown in countercurrent to the product gas, but is directed around the lower end of an insert, it flows seamlessly through the tubular zone from the lowest end of the insert over the entire endangered length of the wall of the tubular zone.

Die Erfindung wird im folgenden anhand eines in der Figur dargestellten Ausführungsbeispieles näher erläutert. Diese zeigt einen Wandabschnitt 1 eines Vergasers, in dem das Produktgas erzeugt wird Der Wandabschnitt 1 geht über in einen Auslaßstutzen 2, der die röhrenförmige Zone bildet, durch die das Produktgas nach oben aus dem Vergaser ausströmt. Das Produktgas führt klerbei teilchenförmige Stoffe mit sich, die aufgrund der hohen Temperatur des Produktgases klebrig sind und erst nach einer Abkühlung des Produktgases ihre Klebrigkeit verlieren. Am unteren Teil des Auslaßstutzens 2 ist jedoch die Temperatur des Produktgases noch so hoch, daß die Gefahr besteht, daß die mitgeführten Teilchen, wenn sie auf eine feste Wand treffen, an dieser hängen bleiben. Da hierdurch der freie Durchmesser des Auslaßstutzens 2 verengt wird oder dieser sogar ganz geschlossen werden kann, ist es erforderlich, das Produktgas so zu leiten, daß es in diesem Zustand nicht in Berührung mit der Innenwand des Auslaßstutzens oder einer anderen festen Wand im Bereich der röhrenförmigen Zone gelangt. Gleichzeitig müssen Maßnahmen vorgesehen werden, um das Produktgas innerhalb der röhrenförmigen Zone zoweit abzukühlen, daß an deren Auslaßende die mitgeführten Teilchen ihre Klebrigkeit verloren haben. Dies wird durch die dargestellte Vorrichtung erreicht.The invention is explained below with reference to an embodiment shown in the figure. This shows a wall section 1 of a carburetor, in which the product gas is generated. The wall section 1 merges into an outlet connection 2, which forms the tubular zone through which the product gas flows upward out of the gasifier. The product gas entrains particulate substances which are sticky due to the high temperature of the product gas and which only lose their tack after the product gas has cooled. At the lower part of the outlet port 2, however, the temperature of the product gas is still so high that there is a risk that the entrained particles, when they hit a solid wall, get caught on it. Since this narrows the free diameter of the outlet nozzle 2 or it can even be closed completely, it is necessary to direct the product gas so that it does not come into contact with the inner wall of the outlet nozzle or any other solid wall in the region of the tubular in this state Zone arrives. At the same time, measures must be taken to cool the product gas within the tubular zone to such an extent that the entrained particles have lost their stickiness at the outlet end thereof. This is achieved by the device shown.

Innerhalb des Auslaßstutzens 2 befindet sich ein ringförmiger Einsatz 3, der zwischen sich und der Innenwand des Auslaßstutzens 2 einen Spalt 4 bildet. Am oberen Ende dieses Spaltes 4 befindet sich in gleichen Abständen über den Umfang des Auslaßstutzens 2 verteilt eine oder mehrere Einlaßöffnung(en) 5 für ein Kühlgas, das zugleich zur Bildung der eine Berührung zwischen dem Produktgas und der Innenwand des Auslaßstutzens 2 bzw. dem Einsatz 3 verhindernden Gaswand verwendet wird. Die Einlaßöffnung(en) 5 können beispielsweise mit einer um den Auslaßstutzen 2 herumgeführten Ringleitung verbunden sein.There is an annular insert 3 within the outlet nozzle 2, which forms a gap 4 between itself and the inner wall of the outlet nozzle 2. At the upper end of this gap 4 is equidistantly distributed over the circumference of the outlet nozzle 2, one or more inlet opening (s) 5 for a cooling gas, which at the same time form a contact between the product gas and the inner wall of the outlet nozzle 2 or the insert 3 preventing gas wall is used. The inlet opening (s) 5 can be connected, for example, to a ring line which is guided around the outlet connection 2.

Das durch den Spalt 4 herabströmende Kühlgas verhindert einen Eintritt des Produktgases in den Spalt 4 und damit eine Verstopfung dieses Spaltes durch die im Produktgas enthaltenen Teilchen. Gleichzeitig wird das Kühlgas durch das nach oben strömende Produktgas um das untere Ende des Einssatzes 3 herumgelenkt, so daß es an der Innenfläche des Einsatzes 3 parallel zu dieser wieder nach oben strömt. Es bildet hierbei eine durchgehende Gaswand, die eine Berührung des Produktgases mit dem Einsatz 3 verhindert. Die im Produktgas mitgeführten klebrigen Teilchen können somit nicht zur Innenwand des Einsatzes 3 gelangen und sich an dieser anlagern. Das Kühlgas bewirkt gleichzeitig während des Durchganges durch den Einsatz 3 eine Kühlung des Produktgases, so daß am oberen Ausgang des Einsatzes 3 das Produktgas soweit abgekühlt ist, daß die Teilchen in diesem ihre Klebrigkeit verloren haben.The cooling gas flowing down through the gap 4 prevents the product gas from entering the gap 4 and thus clogging of this gap by the particles contained in the product gas. At the same time, the cooling gas is directed around the lower end of the insert 3 by the product gas flowing upwards, so that it flows upwards again on the inner surface of the insert 3 parallel to the latter. It forms a continuous gas wall, which prevents the product gas from touching the insert 3. The sticky particles entrained in the product gas can therefore not reach the inner wall of the insert 3 and attach to it. The cooling gas simultaneously causes cooling of the product gas during the passage through the insert 3, so that the product gas has cooled down at the upper outlet of the insert 3 to such an extent that the particles in it have lost their stickiness.

Diese Kühlwirkung wird dadurch unterstützt, daß der Einsatz 3 selbst gekühlt wird. Er enthält hierzu beispielsweise in seinem Innern verlaufende Kühlkanäle, durch die Wasser oder ein anderes geeignetes Kühlmedium strömt.This cooling effect is supported in that the insert 3 itself is cooled. It contains for this purpose, for example, cooling channels running in its interior through which water or another suitable cooling medium flows.

Claims (3)

1. Device for cooling a hot product gas that contains sticky particles which lose their stickiness upon cooling, said device comprising a tubular zone in which the product gas is directly cooled by cooling gas and on the wall of the tubular zone a wall of gas is formed which prevents the product gas from coming into contact with the wall,
characterized in that in the tubular zone at least in part an annular insert (3) is provided for the passage of the product gas so as to form a gap (4) between the wall of the tubular zone (2) and the insert, through which the cooling gas is blasted countercurrently to the product gas and diverted around the bottom end of the insert (3).
2. Device according to claim 1, characterised in that the annular insert (3) is cooled.
3. Device according to claim 2, characterised in that the interior of the annular insert (3) contains cooling ducts.
EP85730082A 1984-07-18 1985-06-11 Device for cooling a hot product gas Expired EP0171351B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85730082T ATE44162T1 (en) 1984-07-18 1985-06-11 DEVICE FOR COOLING A HOT PRODUCT GAS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843427088 DE3427088A1 (en) 1984-07-18 1984-07-18 DEVICE FOR COOLING A HOT PRODUCT GAS
DE3427088 1984-07-18

Publications (2)

Publication Number Publication Date
EP0171351A1 EP0171351A1 (en) 1986-02-12
EP0171351B1 true EP0171351B1 (en) 1989-06-21

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EP85730082A Expired EP0171351B1 (en) 1984-07-18 1985-06-11 Device for cooling a hot product gas

Country Status (14)

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US (1) US4874037A (en)
EP (1) EP0171351B1 (en)
JP (1) JPS6183878A (en)
KR (1) KR940001781B1 (en)
AT (1) ATE44162T1 (en)
AU (1) AU581897B2 (en)
BR (1) BR8503406A (en)
CA (1) CA1274086A (en)
CS (1) CS255888B2 (en)
DD (1) DD237544A5 (en)
DE (2) DE3427088A1 (en)
IN (1) IN164913B (en)
SU (1) SU1384205A3 (en)
ZA (1) ZA854610B (en)

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US4305732A (en) * 1980-02-19 1981-12-15 Brennstoffinstitut Freiberg Gasification apparatus with pressure relieving means
GB2087065B (en) * 1980-11-08 1984-11-07 Rolls Royce Wall structure for a combustion chamber
DE3241853A1 (en) * 1982-11-12 1984-05-17 Hölter, Heinz, Dipl.-Ing., 4390 Gladbeck Combustion chamber with gas transfer pipe, particularly for compacted-coal coking plants
SE8304273D0 (en) * 1983-08-04 1983-08-04 Skf Steel Eng Ab SET AND DEVICE FOR HEATING A GAS WITH ANOTHER GAS
US4703793A (en) * 1986-06-13 1987-11-03 Sante Fe Braun Inc. Minimizing coke buildup in transfer line heat exchangers

Also Published As

Publication number Publication date
DE3427088C2 (en) 1987-05-07
BR8503406A (en) 1986-04-08
SU1384205A3 (en) 1988-03-23
ZA854610B (en) 1986-02-26
CA1274086A (en) 1990-09-18
IN164913B (en) 1989-07-08
AU4384085A (en) 1986-01-23
EP0171351A1 (en) 1986-02-12
KR940001781B1 (en) 1994-03-05
CS517585A2 (en) 1987-07-16
AU581897B2 (en) 1989-03-09
DE3427088A1 (en) 1986-01-30
JPH0474635B2 (en) 1992-11-26
JPS6183878A (en) 1986-04-28
DD237544A5 (en) 1986-07-16
DE3571145D1 (en) 1989-07-27
US4874037A (en) 1989-10-17
ATE44162T1 (en) 1989-07-15
KR860001333A (en) 1986-02-26
CS255888B2 (en) 1988-03-15

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