EP0068304B1 - Process for heating coke ovens and system for carrying out the process - Google Patents
Process for heating coke ovens and system for carrying out the process Download PDFInfo
- Publication number
- EP0068304B1 EP0068304B1 EP82105270A EP82105270A EP0068304B1 EP 0068304 B1 EP0068304 B1 EP 0068304B1 EP 82105270 A EP82105270 A EP 82105270A EP 82105270 A EP82105270 A EP 82105270A EP 0068304 B1 EP0068304 B1 EP 0068304B1
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- EP
- European Patent Office
- Prior art keywords
- heating
- coke
- circulating
- flues
- heating flues
- 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
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B21/00—Heating of coke ovens with combustible gases
- C10B21/10—Regulating and controlling the combustion
- C10B21/18—Recirculating the flue gases
Definitions
- the invention relates to a method for heating coke ovens with the aid of circulating currents in the heating trains and to a device for carrying out the method.
- the aim of heating coke ovens is to achieve a well-cooked coke of uniform quality through uniform heating.
- the invention proposes that the intensity of the circulating currents in the heating trains be designed continuously or discontinuously by means of a constructive design of the sizes of the circulating current and / or reversal point cross sections between the increasing and decreasing heating trains from the machine to the coke side of the furnaces.
- the intensity of the circulating current is understood to be the amount of the flue gas drawn back in relation to the amount of flue gas formed from the freshly supplied combustion media, gas and air.
- the invention initially provides that this variation from the machine to the coke side decreases.
- the variation of the circuit current intensity can be carried out continuously from one pair of heating trains to the next, or in stages.
- a gradation in groups can be understood to mean a gradation from group to group from the machine to the coke side, with several pairs of heating trains each forming a group.
- the grading of the circuit current intensity in a heating wall can also be done discontinuously. For example, it can be carried out in small increments in part of the heating trains of a heating wall, while small increments are then realized again in the subsequent heating trains.
- the flow conditions in the first part of the heating wall should be in a small scattering range with laminar flow and in the other part of the heating wall in a small scattering range again with turbulent flow.
- the circulating current has a self-regulating effect.
- This self-regulating effect of the circulating current consists in the fact that the amount of circulating current decreases as the furnace output increases, while the amount of smoke gas sucked in increases as the heating output decreases.
- This effect means that the flame lengths can be kept almost constant even with fluctuating furnace outputs over a wide range.
- This effect also meets the heating requirements in composite stoves.
- a lower circulating current is required for low gas heating and a stronger one for high gas heating. Since larger amounts of exhaust gas are primarily generated with lean gas heating than with high-gas heating, a lower flue gas return is automatically established with lean gas heating due to the self-regulating effect. With its self-regulating intensity effect, the circulating current automatically almost compensates for the requirements of the different types of underfire gas.
- the settings of the circulating current intensities in the different heating trains of a heating wall are chosen by design or regulation of the resistances in the flow paths so that the self-regulating effect of the circulating current is optimally used in the event of a change in output or gas type of the furnace heating.
- the invention provides that the cross-sections are varied individually or together from machine to coke side over the entire wall length or in zones . If changes are made together, they can be proportional, in the same direction or in the same direction.
- the invention provides that the intensities of the circulating currents in the heating trains are increased by additional gas jets Speed in a manner known per se from DE-OS 21 61 638 - if necessary differently - be amplified.
- the total cross-sections per circuit or reversal point consist of one or more openings. It is possible that each or individual of these openings with one or more throttle members, for. B. slides or flaps are provided, which also allow control of the circulating current during operation.
- the invention provides a device for heating coke ovens, in which the heating walls adjacent to the coke ovens are divided into pairs of heating trains from the machine side to the coke side of the coke oven battery and the partitions of the two heating trains of a pair of heating trains each have one or more circulating current at their lower ends. Openings and at their upper end each have one or more reversing point openings, to which control instruments such as flaps, slides or the like are assigned, which is characterized in that the cross sections of the circular flow openings and / or the reversing point openings differ from the machine to the coke side of the coke oven battery are large.
- twin heating trains With 1 and 2 the two heating trains are designated. which form a pair of heating cables and are alternately flamed upwards in a known manner.
- This pair of heating trains - also called twin heating trains - represents a section of a heating wall, which consists of a large number of twin heating trains connecting to the left and right up to the machine or coke side.
- the partition 3 of the heating cables 1 and 2 has at its lower end two circular flow openings 4, each of which can be closed with one or more flaps 5 in the present case.
- the cross sections of the circular flow openings differ from the machine to the coke side.
- the heating cables in the illustrated embodiment are connected to one another by two openings 6 and 7, the so-called reversal points, one above the other.
- each of these openings is assigned a roller 8 or 9, which can completely or partially release this opening or also practically completely close it.
- the cross sections of the two reversal points are preferably designed differently from the machine to the coke side, just like that of the circular flow openings.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Coke Industry (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
- Inorganic Insulating Materials (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Description
Die Erfindung bezieht sich auf ein Verfaren zur Beheizung von Koksöfen mit Hilfe von Kreisströmen in dem Heizzügen sowie auf eine Einrichtung zur Durchfürung des Verfahrens. Ziel der Beheizung von Koksöfen ist die Erreichung eines gut abgegarten Kokses gleichmässiger Qualität durch gleichmässige Beheizung.The invention relates to a method for heating coke ovens with the aid of circulating currents in the heating trains and to a device for carrying out the method. The aim of heating coke ovens is to achieve a well-cooked coke of uniform quality through uniform heating.
Da die Kammerbreite bei Koksöfen von der Maschinen- zur Koksseite hin zunimmt, steigt auch in gleicher Richtung der Wärmebedarf von Heizug zu Heizug. Durch entsprechende Verteilung der Beheizungsmedien wird die horizontale Gleichmässigkeit der Beheizung erreicht. Umgekehrt aber zum Wärmebedarf ändern. d. h. verringern, sich in gleicher Richtung de Querschnitte der Heizzülge. Daraus resultieren von der Maschinen- zur Koksseite hin grössere Geschwindigkeiten der Verbrennungsgase und grössere Flammenlängen. Diese beeinflussen die vertikale Gleichmässigkeit der Beheizung.Since the chamber width in coke ovens increases from the machine to the coke side, the heat requirement increases from heater to heater in the same direction. The horizontal uniformity of the heating is achieved by appropriate distribution of the heating media. Conversely, change to heat requirements. d. H. decrease, in the same direction de cross sections of the heating cable. This results in higher combustion gas speeds and longer flame lengths from the machine to the coke side. These affect the vertical uniformity of the heating.
Nun kann man die Flammen verlängern durch die Anwendung des Kreisstroms. d. h. durch Ansaugung von ausgebranntem Abgas aus dem fallenden Heizzug in den aufsteigenden, beflammten Heizzug, wobei das ausgebrannte Rauchgas den frisch zugefürten Verbrennungsmedien beigemischt wird. Hierdurch verringern sich die Anfangskonzentrationen der Reaktionsmedien, und der Ablauf der Verbrennungsreaktion wird verzögert, d.h. die Flammen werden verlängert. Dies ist eine Funktion der Intensität des Kreisstroms.Now you can extend the flames by using the circular current. d. H. by sucking in burned-out exhaust gas from the falling heating train into the ascending, flamed heating train, the burned-out flue gas being admixed with the freshly supplied combustion media. This reduces the initial concentrations of the reaction media and the course of the combustion reaction is delayed, i.e. the flames are extended. This is a function of the intensity of the circulating current.
Die Anwendung des Kreisstroms bei der Beheizung von Koksöfen ist an sich bekannt und bewährt. Es hat sich jedoch gezeigt, daß die Flammenlängen von der Maschinen- zur Koksseite hin unterschiedlich durch den Kreisstrom beeinflußt werden müssen.The use of the circulating current for heating coke ovens is known and proven per se. However, it has been shown that the flame lengths from the machine side to the coke side have to be influenced differently by the circulating current.
Die Erfindung schlägt hierzu vor, daß die Intensität der Kreisströme in den Heizzügen mittels konstruktiver Auslegung der Größen der Kreisstrom- und/oder Umkehrstellenquerschnitte zwischen den steigend und fallend beaufschlagten Heizzügen von der Maschinenzuf Koksseite der Öfen kontinuierlich oder diskontinuierlich variabel ausgebildet wird. Unter der Intensität des Kreisstroms sei die Menge des rückgesaugten Rauchgases im Verhältnis zu der aus den frisch zugeführten Verbrennungsmedien Gas und Luft gebildeten Rauchgasmenge verstanden.To this end, the invention proposes that the intensity of the circulating currents in the heating trains be designed continuously or discontinuously by means of a constructive design of the sizes of the circulating current and / or reversal point cross sections between the increasing and decreasing heating trains from the machine to the coke side of the furnaces. The intensity of the circulating current is understood to be the amount of the flue gas drawn back in relation to the amount of flue gas formed from the freshly supplied combustion media, gas and air.
Die Erfindung sieht zunächst vor, daß diese Variation von der Maschinen- zur Koksseite hin abnehmend erfolgt. Die Variation der Kreisstromintensität kann dabei kontinuierlich von Heizzugpaar zu Heizzugpaar oder gruppenweise gestuft vorgenommen werden. Unter gruppenweiser Stufung kann eine solche mit gleichmäßiger Stufung von Gruppe zu Gruppe von der Maschinen- zur Koksseite hin verstanden werden, wobei mehrere Heizzugpaare jeweils eine Gruppe bilden.The invention initially provides that this variation from the machine to the coke side decreases. The variation of the circuit current intensity can be carried out continuously from one pair of heating trains to the next, or in stages. A gradation in groups can be understood to mean a gradation from group to group from the machine to the coke side, with several pairs of heating trains each forming a group.
Die Stufung der Kreisstromintensität in einer Heizwand kann aber auch diskontinuierlich erfolgen. Beispielsweise kann sie in einem Teil der Heizzüge einer Heizwand in geringen Schrittweiten erfolgen, während dan nach einer grossen in den nachfolgenden Heizzügen wieder geringe Schrittweiten zur Verwirklichung kommen. Hier sollen sich die Strömungsverhältnisse im ersten Teil der Heizwand in einem geringen Streubereich bei laminarer Strömung und in dem anderen Teil der Heizwand in einem wiederum geringen Streubereich bei turbulenter Strömung befinden.The grading of the circuit current intensity in a heating wall can also be done discontinuously. For example, it can be carried out in small increments in part of the heating trains of a heating wall, while small increments are then realized again in the subsequent heating trains. Here, the flow conditions in the first part of the heating wall should be in a small scattering range with laminar flow and in the other part of the heating wall in a small scattering range again with turbulent flow.
Es kan allerdings auch eine solche Variante diskontinuierlicher Stufung erforderlich sein. dass die Kreisstromstärke in einigen Heizzügen einer Heizwand zunehmen muss in Richtung zur Koksseite hin, während sie in den anderen abnimmt.However, such a variant of discontinuous grading may also be necessary. that the circulating current strength in some heating trains of one heating wall has to increase towards the coke side, while it decreases in the others.
Es ist bekannt, dass der Kreisstrom eine selbstregulierende Wirkung besitzt. Diese selbstregulierende Wirkung des Kreisstromes besteht darin, dass bei steigender Ofenleistung die Kreisstrommenge zurückgeht, während bei sinkender Beheizungsleistung die angesaugte Rauchgasmenge verstärkt wird. Durch diesen Effekt können auch bei schwankenden Ofenleistungen in weitem Streubereich die Flammenlängen nahezu konstant gehalten werden. Dieser Effekt kommt auch bei Verbundöfen den Erfordernissen der Beheizung sehr entgegen. Bei Schwachgasbeheizung ist ein geringerer Kreisstrom erforderlich, bei Starkgasbeheizung ein stärkerer. Da bei Schwachgasbeheizung grössere Abgasmengen primär erzeugt werden als bei Starkgasbeheizung, stellt sich automatisch bei der Schwachgasbeheizung durch die selbstregulierende Wirkung eine geringere Rauchgasrücksaugung ein. Somit gleicht der Kreisstrom durch seine selbstregulierende Intensitätswirkung auch die Erfordernisse der unterschiedlichen Unterfeuerungsgasarten automatisch nahezu aus.It is known that the circulating current has a self-regulating effect. This self-regulating effect of the circulating current consists in the fact that the amount of circulating current decreases as the furnace output increases, while the amount of smoke gas sucked in increases as the heating output decreases. This effect means that the flame lengths can be kept almost constant even with fluctuating furnace outputs over a wide range. This effect also meets the heating requirements in composite stoves. A lower circulating current is required for low gas heating and a stronger one for high gas heating. Since larger amounts of exhaust gas are primarily generated with lean gas heating than with high-gas heating, a lower flue gas return is automatically established with lean gas heating due to the self-regulating effect. With its self-regulating intensity effect, the circulating current automatically almost compensates for the requirements of the different types of underfire gas.
Erfindungsgemäß werden die Einstellungen der Kreisstromintensitäten in den verschiedenen Heizzügen einer Heizwand durch konstruktive Auslegung bzw. Einregulierung der Widerstände in den Strömungswegen so gewählt, daß bei einer Leistungs- oder Gasartänderung der Ofenbeheizung die selbstregulierende Wirkung des Kreisstroms optimal genutzt wird.According to the settings of the circulating current intensities in the different heating trains of a heating wall are chosen by design or regulation of the resistances in the flow paths so that the self-regulating effect of the circulating current is optimally used in the event of a change in output or gas type of the furnace heating.
Da die Intensität der Kreisströme in den Heizzügen wesentlich durch die Größe der Kreisstrom- und Umkehrstellenquerschnitte in den Binderwänden beeinflußt wird, sieht die Erfindung vor, daß die Querschnitte über die ganze Wandlänge oder zonenweise jeweils einzeln oder gemeinsam von der Maschinen- zur Koksseite hin variiert werden. Bei gemeinsamer Änderung kann diese proportional, gleichsinnig oder ungleichsinnig erfolgen.Since the intensity of the circulating currents in the heating trains is significantly influenced by the size of the circulating current and reversal cross-sections in the truss walls, the invention provides that the cross-sections are varied individually or together from machine to coke side over the entire wall length or in zones . If changes are made together, they can be proportional, in the same direction or in the same direction.
Ferner sieht die Erfindung vor, daß die Intensitäten der Kreisströme in den Heizzügen durch zusätzliche Gasstrahlen erhöhter Geschwindigkeit in an sich aus der DE-OS 21 61 638 bekannter Weise - gegebenenfalls unterschiedlich - verstärkt werden.Furthermore, the invention provides that the intensities of the circulating currents in the heating trains are increased by additional gas jets Speed in a manner known per se from DE-OS 21 61 638 - if necessary differently - be amplified.
Die Gesamtquerschnitte je Kreisstrom- oder Umkehrstelle können, wie aus der DE-OS 19 36 023 bekannt, aus einer oder mehreren Öffnungen bestehen. Dabei ist es möglich, daß jede oder einzelne dieser Öffnungen mit einem oder mehreren Drosselorganen, z. B. Schiebern oder Klappen, versehen werden, die zusätzlich eine Regelung des Kreisstromes während des Betriebes ermöglichen.The total cross-sections per circuit or reversal point, as known from DE-OS 19 36 023, consist of one or more openings. It is possible that each or individual of these openings with one or more throttle members, for. B. slides or flaps are provided, which also allow control of the circulating current during operation.
Die Erfindung sieht schließlich noch eine Einrichtung zur Beheizung von Koksöfen vor, bei der die den Koksöfen benachbarten Heizwände von der Maschinen- zur Koksseite der Koksofenbatterie in Heizzugpaare unterteilt sind und die Trennwände der beiden Heizzüge eines Heizzugpaares an ihrem unteren Ende jeweils eine oder mehrere Kreisstrom-Öffnungen und an ihrem oberen Ende jeweils eine oder mehrere Umkehrstellenöffnungen aufweisen, denen Regelinstrumente, wie Klappen, Schieber oder dergleichen, zugeordnet sind, die dadurch gekennzeichnet ist, daß die Querschnitte der Kreisstromöffnungen und/oder der Umkehrstellenöffnungen von der Maschinen- zur Koksseite der Koksofenbatterie unterschiedlich groß bemessen sind.Finally, the invention provides a device for heating coke ovens, in which the heating walls adjacent to the coke ovens are divided into pairs of heating trains from the machine side to the coke side of the coke oven battery and the partitions of the two heating trains of a pair of heating trains each have one or more circulating current at their lower ends. Openings and at their upper end each have one or more reversing point openings, to which control instruments such as flaps, slides or the like are assigned, which is characterized in that the cross sections of the circular flow openings and / or the reversing point openings differ from the machine to the coke side of the coke oven battery are large.
Die Erfindung ist in der Zeichnung beispielsweise veranschaulicht.The invention is illustrated in the drawing, for example.
Es zeigen:
- Fig. 1 eine senkrechten Schnitt durch ein Heizzugpaar und
- Fig. 2 einen Schnitt nach der Linie A - A der Fig. 1.
- Fig. 1 is a vertical section through a pair of Heizzug and
- 2 shows a section along the line A - A of FIG. 1st
Mit 1 und 2 sind die beiden Heizzüge bezeichnet. die ein Heizzugpaar bilden und abwechselnd in bekannter Weise aufwärts beflammt werden. Dieses Heizzugpaar - auch Zwillingsheizzüge genanntstellt einen Ausschnitt einer Heizwand dar, die aus einer Vielzahl sich nach links und rechts bis zur Maschinen - bzw. Koksseite anschliessende Zwillingsheizzüge besteht.With 1 and 2 the two heating trains are designated. which form a pair of heating cables and are alternately flamed upwards in a known manner. This pair of heating trains - also called twin heating trains - represents a section of a heating wall, which consists of a large number of twin heating trains connecting to the left and right up to the machine or coke side.
Die Trennwand 3 der Heizzüge 1 und 2 weist an ihrem unteren Ende zwei Kreisstromöffnungen 4 auf die im vorligenden Falle jeweils mit einer oder auch mehreren Klappen 5 verschlossen werden können. Die Querschnitte der Kreisstromöffnungnen sind erfindungsgemäss, wie vorstehend näher erläutert, von der Maschinen- zur Koksseite unterschiedlich.The partition 3 of the
Am oberen Ende der Trennwand 3 sind die Heizzüge bei der dargestellten Ausführungsform durch zwei übereinander liegende Öffnungen 6 und 7, den sogenannten Umkehrstellen, miteinander verbunden. Jede dieser Öffnungen ist im vorliegenden Falle eine Rolle 8 bzw. 9 zugeordnet, die diese Öffnung ganz oder teilweise freigeben oder auch praktisch völlig verschliessen kann. Die Querschnitte der beiden Umkehrstellen sind vorzugsweise ebenso wie die der Kreisstromöffnungen von der Maschninenzur Koksseite unterschiedlich ausgelegt.At the upper end of the partition 3, the heating cables in the illustrated embodiment are connected to one another by two openings 6 and 7, the so-called reversal points, one above the other. In the present case, each of these openings is assigned a
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT82105270T ATE29898T1 (en) | 1981-07-01 | 1982-06-16 | METHOD OF HEATING COKE OVEN AND EQUIPMENT FOR IMPLEMENTING THE METHOD. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19813125886 DE3125886A1 (en) | 1981-07-01 | 1981-07-01 | METHOD FOR HEATING COOKING OVENS AND DEVICE FOR CARRYING OUT THE METHOD |
| DE3125886 | 1981-07-01 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0068304A2 EP0068304A2 (en) | 1983-01-05 |
| EP0068304A3 EP0068304A3 (en) | 1984-10-03 |
| EP0068304B1 true EP0068304B1 (en) | 1987-09-23 |
Family
ID=6135821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP82105270A Expired EP0068304B1 (en) | 1981-07-01 | 1982-06-16 | Process for heating coke ovens and system for carrying out the process |
Country Status (11)
| Country | Link |
|---|---|
| EP (1) | EP0068304B1 (en) |
| JP (2) | JPS587479A (en) |
| AR (1) | AR228499A1 (en) |
| AT (1) | ATE29898T1 (en) |
| AU (1) | AU553625B2 (en) |
| BR (1) | BR8203811A (en) |
| DE (2) | DE3125886A1 (en) |
| ES (1) | ES513079A0 (en) |
| IN (1) | IN157902B (en) |
| NO (1) | NO159803C (en) |
| ZA (1) | ZA823745B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3681979B1 (en) | 2017-09-15 | 2023-11-01 | thyssenkrupp Industrial Solutions AG | Coke oven device with eccentric inlets for producing coke and method for operating the coke oven device and control system and use |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106675584A (en) * | 2016-11-11 | 2017-05-17 | 中冶焦耐(大连)工程技术有限公司 | Structure and method for adjusting lengthwise air-flow distribution of coke oven by synergizing upper part with lower part |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE897093C (en) * | 1939-11-17 | 1953-11-19 | Koppers Co Inc | Chamber furnace for the production of gas and coke |
| DE1936023A1 (en) * | 1969-07-16 | 1971-02-04 | Koppers Gmbh Heinrich | Device for the complete or partial closing of the gas passage openings in the heating walls of coking chamber ovens |
| BE790985A (en) * | 1971-12-11 | 1973-03-01 | Koppers Gmbh Heinrich | PROCEDURE FOR THE UNIFORMIZATION OF THE HEATING OF HORIZONTAL CHAMBER COKE OVENS AND INSTALLATION FOR THE PRACTICE OF |
-
1981
- 1981-07-01 DE DE19813125886 patent/DE3125886A1/en not_active Withdrawn
-
1982
- 1982-05-24 IN IN600/CAL/82A patent/IN157902B/en unknown
- 1982-05-28 ZA ZA823745A patent/ZA823745B/en unknown
- 1982-06-14 ES ES513079A patent/ES513079A0/en active Granted
- 1982-06-15 AR AR289690A patent/AR228499A1/en active
- 1982-06-16 EP EP82105270A patent/EP0068304B1/en not_active Expired
- 1982-06-16 DE DE8282105270T patent/DE3277376D1/en not_active Expired
- 1982-06-16 AT AT82105270T patent/ATE29898T1/en active
- 1982-06-21 JP JP57105571A patent/JPS587479A/en active Pending
- 1982-06-30 BR BR8203811A patent/BR8203811A/en unknown
- 1982-06-30 AU AU85477/82A patent/AU553625B2/en not_active Ceased
- 1982-06-30 NO NO822288A patent/NO159803C/en unknown
-
1991
- 1991-10-09 JP JP1991081977U patent/JPH0489535U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3681979B1 (en) | 2017-09-15 | 2023-11-01 | thyssenkrupp Industrial Solutions AG | Coke oven device with eccentric inlets for producing coke and method for operating the coke oven device and control system and use |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0489535U (en) | 1992-08-05 |
| JPS587479A (en) | 1983-01-17 |
| AU8547782A (en) | 1984-01-05 |
| IN157902B (en) | 1986-07-19 |
| BR8203811A (en) | 1983-06-28 |
| ZA823745B (en) | 1983-03-30 |
| EP0068304A2 (en) | 1983-01-05 |
| ATE29898T1 (en) | 1987-10-15 |
| NO822288L (en) | 1983-01-03 |
| AU553625B2 (en) | 1986-07-24 |
| NO159803B (en) | 1988-10-31 |
| NO159803C (en) | 1989-02-08 |
| DE3125886A1 (en) | 1983-01-27 |
| AR228499A1 (en) | 1983-03-15 |
| EP0068304A3 (en) | 1984-10-03 |
| ES8307279A1 (en) | 1983-07-01 |
| DE3277376D1 (en) | 1987-10-29 |
| ES513079A0 (en) | 1983-07-01 |
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