EP0329984B1 - Improved automatic combustion control method for a rotary combustor - Google Patents

Improved automatic combustion control method for a rotary combustor Download PDF

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Publication number
EP0329984B1
EP0329984B1 EP89101714A EP89101714A EP0329984B1 EP 0329984 B1 EP0329984 B1 EP 0329984B1 EP 89101714 A EP89101714 A EP 89101714A EP 89101714 A EP89101714 A EP 89101714A EP 0329984 B1 EP0329984 B1 EP 0329984B1
Authority
EP
European Patent Office
Prior art keywords
barrel
air
combustion
varying
oxygen
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 - Lifetime
Application number
EP89101714A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0329984A2 (en
EP0329984A3 (en
Inventor
Suh Yong Lee
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.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Publication of EP0329984A2 publication Critical patent/EP0329984A2/en
Publication of EP0329984A3 publication Critical patent/EP0329984A3/en
Application granted granted Critical
Publication of EP0329984B1 publication Critical patent/EP0329984B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/20—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having rotating or oscillating drums
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F23N1/022—Regulating fuel supply conjointly with air supply using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/50—Control or safety arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties
    • F23N5/006—Systems for controlling combustion using detectors sensitive to combustion gas properties the detector being sensitive to oxygen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2207/00—Control
    • F23G2207/10—Arrangement of sensing devices
    • F23G2207/101—Arrangement of sensing devices for temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2207/00—Control
    • F23G2207/10—Arrangement of sensing devices
    • F23G2207/103—Arrangement of sensing devices for oxygen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2207/00—Control
    • F23G2207/30—Oxidant supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2900/00—Special features of, or arrangements for incinerators
    • F23G2900/55—Controlling; Monitoring or measuring
    • F23G2900/55009—Controlling stoker grate speed or vibrations for waste movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F23N2225/16—Measuring temperature burner temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2229/00—Flame sensors
    • F23N2229/20—Camera viewing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/02—Air or combustion gas valves or dampers
    • F23N2235/06—Air or combustion gas valves or dampers at the air intake
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2241/00—Applications
    • F23N2241/18—Incinerating apparatus

Definitions

  • the invention relates to a rotary combustor, for the incineration of wet or dry municipal solid waste material, and more particularly to an improved automatic combustion control method for the rotary combustor.
  • a water-cooled rotary combustor generally includes a combustion barrel having a generally cylindrical side wall affixed to annular support bands which are received on rollers to permit rotation of the barrel about its longitudinal axis.
  • the barrel has a generally open input end for receiving material to be burned, such as municipal solid waste which can vary in moisture content.
  • the opposite or output end of the barrel is disposed in a flue.
  • the combustion barrel is tilted from the horizontal, the input end being higher than the output end.
  • the combustion barrel is cooled by cooling pipes joined by gas porous interconnections to form the generally cylindrical side wall of the barrel.
  • the composition of the waste material varies, it can be difficult to maintain a constant feed rate of the solid waste into the barrel, and thus the intensity of the fire varies over time. Also, the heat of combustion of solid waste for each input charge into the combustor varies greatly. As a result, the constitution of the exhaust gases can also vary over time. By controlling the rate of combustion within the barrel, a more efficient incineration occurs and produces a more stable constitution of the exhaust gases and less unburned hydrocarbons. More particularly, it is important to maintain the carbon monoxide level below 100 ppm since that is the level required by most State laws. Another requirement imposed on the operators of municipal waste incinerators is that the oxygen level in the exhaust gases not fall below 3%.
  • US-Patent 4 395 958 discloses a method of automatically controlling combustion in rotary combustor having a rotating combustion barrel in which solid waste material is burned by air supplied to the barrel.
  • the solid waste material is introduced at one end of the barrel and exhaust gases and ash are exited at the other end of the barrel.
  • the supplied amount of air is controlled in response to pressure in the barrel and also in response to the oxygen content in the exhaust gases, and the speed at which the barrel rotates is controlled in response to the temperature in the barrel.
  • Document WO 88 06 698 which has been published only after the priority date of the present application but has earlier priority date than the present application, discloses a method of automatically controlling combustion in a rotary combuster having a rotating combustion barrel in which solid waste material is burned by air supply through the barrel though holes disposed throughout its length and periphery.
  • the combustion air is supplied through a plurality of ducts separately as underfire air and overfire air to the barrel, with individual variation of the overfire and underfire air to each portion of the barrel in response to changes in the temperature of the barrel and changes in percent of oxygen in exhaust gases.
  • the present invention resides in an improved method of automatically controlling combustion in the rotary combuster as defined in claim 1, and with further advantages features as defined in the subclaim.
  • the improved method of the present invention comprises controlling combustion in a rotary combustor by precisely controlling the supply of combustion gas to six combustion zones of a rotary combustor used for burning municipal solid waste material.
  • the improved method of the present invention comprises the steps of sensing an amount of oxygen present in the exhaust gas to produce an oxygen sensor signal, as well as sensing the temperature within the combustor to produce a temperature sensor signal, and automatically controlling the combustion gas, or air, supplied to three different combustion zones in response to these signals to most accurately maintain the oxygen level in the exhaust gas at a predetermined value.
  • a typical rotary combustor as represented by Figs. 1, 2, and 3, has as its incineration chamber a generally cylindrical combustion barrel 11 which is comprised of alternating longitudinally extending cooling pipes 12 and perforated web structures 13.
  • the web structures 13 are preferably formed of bar steel and have openings 14 therethrough for supplying combustion gas, preferably air, to the combustion barrel 11.
  • Solid material particularly municipal solid waste material 15, is burned within the rotating combustion barrel 11.
  • the barrel 11 rotates about its central axis of rotation which is inclined slightly from the horizontal, an input end 16 being slightly higher than an output or exit end 17.
  • the combustion barrel 11 rotates (in this example) in a clockwise direction as shown by arrow 18, so as to continually mix the waste material 15.
  • the input 16 and output ends 17 of the combustion barrel 11 are generally encircled by support bands 19 which are received on rotating means, preferably rollers, 20. In this manner, the combustion barrel 11 is rotated.
  • the exhaust gases shown by arrows 21 which are thereby generated exit the combustion barrel 11 and are contained within an exhaust area 22 in enclosure 23 (see. Fig. 2). Exhaust gases 21 exit the enclosure 23 through a flue 24 located at the output end 17 of the combustor 11 and flow past an oxygen sensor 25. Other, solid combustion products or ash 26, exit the combustion barrel 11 at the output end 17 as well. The slight incline of the combustion barrel 11 facilitates the discharge of these solid combustion products or ash 26.
  • the cooling pipes 12 have circulating therethrough a coolant, typically water, which enters the cooling pipes 12 from a ring header 27 located at the output end 17 of the combustion barrel 11.
  • the coolant flows towards the input end 16 to a return means (not shown) which returns the coolant, which has been heated by the incineration of the waste material, to the header 27.
  • the high energy coolant is discharged to a heat exchanger or boiler 28 via supply pipe 29.
  • the heat exchanger 28 is connected to a steam driven electrical power generating system (not shown) as is well known in the art. From the heat exchanger 22, low energy coolant reenters the cooling pipes 12 through the ring header 27 forming a closed cycle.
  • the combustion barrel 11 is generally comprised of three combustion zones, A, B, and C serially disposed lengthwise along the combustion barrel 11, as shown in Fig. 1.
  • zone A The primary function of zone A is to dry the waste material, although combustion is initiated here. Most of the burning of the waste material 15 is accomplished in the middle zone, B. Within zone C, combustion of the solid waste has been essentially completed.
  • a temperature sensing device 31, typically a thermocouple, is preferably located in zone A of the barrel 11. The temperature sensor 31 senses the temperature within the combustion barrel 11, for reasons which are fully explained later in this description.
  • ducts or windboxes 34, 37 and 40 Disposed beneath each of the three combustion zones A, B, and C, are ducts or windboxes 34, 37 and 40, respectively.
  • Each windbox is comprised of an underfire air and overfire air zone, for reasons which will become readily apparent.
  • Combustion gas, or air is supplied to the combustion barrel 11 through the openings 14 of the perforated web structures 13 via these windboxes 34, 37 and 40.
  • zone B windbox 37 As shown in Fig.
  • Combustion gas is supplied to each of the windboxes 34, 37, and 40 by a blower 48 via air duct 49.
  • Combustion gas is separately supplied to the overfire and underfire air zones 35, 36, 38, 39, 41 and 42 by a corresponding conduit 35′, 36′, 38′, 39′, 41′ and 42′ connected between the air duct 49 and the six zones, each of the conduits having a damper 50 disposed therein.
  • the conduit dampers 50 are the main control means described according to the present invention.
  • Overfire air is defined as that which flows from the air zones 36, 39, and 42 through the area of openings 14 in the combustion barrel 11 which remains mostly uncovered due to rotational shifting of the waste material 15. It is referred to as overfire air since the combustion gas naturally flows through the uncovered openings over the waste material 15, since that is the path of least resistance.
  • underfire air is defined as that which flows from the air zones 35, 38, and 41 through the area of openings 14 in the combustion barrel 11 which remain covered by waste material 15. Since the waste material 15 is typically composed of irregularly-shaped objects, the underfire air will filter through the waste material 15 to the surface where combustion is taking place. This facilitates drying of wet waste material 15, particularly in Zone A. Since combustion predominantly occurs in zone B, the underfire air/overfire air distinction generally does not apply in zone C. The importance of this fact will readily become apparent.
  • the dampers 50 and rotating means 20 are controlled by a control unit 51.
  • the control unit 51 is comprised of a microprocessor 52, windbox damper controller 53 and rotation drive controller 54. Inputs to the control unit 51 are signals from the oxygen sensor 25 disposed within the flue 24 and the temperature sensing device 31, preferably disposed within zone A of the combustion barrel 11. After combustion has been initialized and becomes self-sustaining, the control system will act to maintain a constant rate of combustion.
  • exhaust gases 21 exit through the flue 24 and are sensed by the oxygen sensor 25.
  • This produces an oxygen gas sensor signal which is inputted to the control unit 51.
  • the microprocessor 52 of the control unit 51 which can be programmed by one of ordinary skill in the art, responds to the oxygen sensor signal to generate an output signal based upon the percentage of oxygen present in the exhaust gas 21. Different output signals are generated depending upon whether the level of oxygen is above or below some predetermined value in the range of about 4% to 10% by volume, and preferably between about 5% to 8%.
  • the most preferred setting is a function of material being incinerated and is unique for each plant.
  • the first step to be undertaken when the percentage of oxygen gas in the exhaust 21 is not at the predetermined value at about 5% and 8% is to adjust the airflow into zone C windbox 40. If the oxygen content is below the specified range, airflow into zone C is increased; if oxygen content is above 8%, airflow is decreased.
  • the air distribution between the underfire and overfire air zones is essentially equal in zone C. Since almost no burning of solids occurs in zone C and only gases burn or further combine with oxygen, the effect of inputting more or less air into either zone 41 or 42 is of little consequence.
  • the control of air into zone C is done by adjustment of the windbox damper 50 openings.
  • the damper openings for underfire 41 and overfire 42 air zones of windbox 40 should have a minimum opening of about 10% and a maximum of about 100%.
  • This alternate step requires the simultaneous adjustment of the windbox 34 and 37 damper openings to maintain constant airflow to these two zones.
  • the controller should additionally be programmed to maintain mass flow into the zone A windbox 34 and zone B windbox 37 if adjustment of combustion gas into zone C windbox 40 is performed by adjustment of the blower 48 fan speed or damper opening.
  • the airflow control into zone C should be sufficient to bring the oxygen level in the exhaust gas 21 to the setpoint of between about 4% to 10% by volume in the flue 24. If the burning rate in the combustion barrel 11 is either too high or too low to be able to control the oxygen level by controlling the supply of combustion gas to zone C alone, the windbox controller 53 is commanded by the microprocessor 52 to go on to the next step.
  • the microprocessor 52 uses the signal from the oxygen sensor 25, to direct the windbox controller 53 to automatically control the supply of combustion gas to the zone B windboxes 38 and 39 as follows: If the oxygen level of the exhaust gas 21 is below about 5%, and preferably if it is below about 4.5%, the supply of combustion gas to this zone should be decreased; and if the oxygen level is above about 8%, the combustion gas supplied to zone B should be increased. This adjustment is made by varying the damper 50 openings. If the adjustment of air to zone C was made by adjusting the blower 48 fan or damper, then this is especially true.
  • control of combustion gas supplied to zone B consists of supplying a greater percentage of combustion gas to the underfire air zone 38 than the overfire air zone 39, on the order of 60% to 40%, since the underfire air has more of an influence on the combustion rate.
  • the minimum and maximum damper openings for zone B underfire 38 and overfire 39 air zones should preferably be about 10% and 80%, respectively.
  • the windbox controller 53 is directed by the microprocessor 52 to perform the following step: If the oxygen level, as indicated by the oxygen sensor 25, is above about 8.5%, then the supply of combustion gas to zone A is increased; or if the oxygen level is below about 4%, then less combustion gas or air is supplied to zone A.
  • the windbox controller 53 performs this step by adjusting the supply of combustion gas to the zone A overfire air zone 36, in dependence upon the oxygen sensor signal.
  • the zone A overfire air zone 36 preferably has a maximum damper opening of about 50%, and a minimum limit of about 0%.
  • Zone A underfire air zone 35 damper opening should have a minimum and maximum opening and corresponding combustion gas flow rate inversely proportional to the combustion barrel temperature sensing device 31 reading.
  • the temperature sensing device 31 produces a signal above a predetermined setpoint, which setpoint will be unique for each plant, the supply of combustion gas to the underfire air zone 35 is decreased, and it is automatically increased if the signal is below a predetermined temperature setting.
  • the temperature should be maintained at a setpoint in the range of 1100°C (2000°F); however it should be understood that the setpoints are dependent upon the device's location within the combustion barrel 11 as well as the size of the combustor itself.
  • the rate of rotation of the combustion barrel 11 can be adjusted as well. This step would be necessary if the above steps do not result in the level of oxygen in the exhaust gas 21 being maintained within the predetermined range of between about 5% and 8%, most preferably at about 6.5% by volume. This may occur in the case of very wet waste material 15, wherein the oxygen level would be above 8%; or in the case where the rate of rotation, shown by arrow 18, had been previously increased and now drier waste material 15 is being incinerated in the combustion barrel 11 and the oxygen level is below 5%. Since combustion takes place at the surface of the continually rotating waste material 15, a faster rotational speed will increase the combustion rate because new material 15 is continually exposed to the fire 47. In the case of very wet waste material 15, a faster rotational speed will dry the material more quickly when exposed to the fire 47 at the surface, along with the drying action accomplished by the additional air previously inputted through the zone A underfire air zone 35.
  • the control of the rate of rotation of the combustion barrel 11 is based upon the output signal from the temperature sensing device 31. Dry waste material will burn at a higher temperature than wet waste material. If the temperature within the combustion barrel 11 is above the predetermined temperature setting, as determined by the temperature sensing device 31, the rotation controller 54 will be directed by the microprocessor 52 to decrease the rate of rotation of the rotating means 20 and thus the combustion barrel 11. A slower rotational speed will cause less material 15 to be exposed to the surface and thereby slow the combustion rate, so that combustion mainly takes place in Zone B.
  • the rotation controller 54 will increase the rate of rotation of the combustion barrel 11 to dry the wet waste material and increase the rate of combustion, since more waste material 15 will be exposed to the surface to thereby dry the wet waste material and increase the combustion rate.
  • each zone or increase/decrease in rate of rotation, necessary to maintain a more stable combustion rate is dependent upon how great a deviation from the predetermined setpoints of the sensors is detected. Since these parameters are a function of combustor size as well, each incineration plant requires the defining of unique parameters. However, by performing these precise steps according to the present invention as represented in the flow chart of Fig. 5, based solely upon the output signals produced by the oxygen sensor 25 and the temperature sensor 31, the combustion rate of solid municipal waste material 15 can be most efficiently controlled, regardless of its varied composition over time, especially as to moisture content, so as to maintain the level of carbon monoxide and unburned hydrocarbons in the exhaust well below statutory requirements.
  • the improved control method is able to maintain the temperature in the combustor at a level which is high enough to complete the combustion, but at a level below where the clinker starts to form regardless of combustor size.
  • the method minimizes temperature fluctuations, which may initiate the clinker build-up, once combustion in the combustor has become self-sustaining. Also, a more stable combustion rate will result independent of feed rate, thereby preventing clinker formation. In this manner, the volume of solid waste material can be reduced by over 90% in a clean and efficient method.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Incineration Of Waste (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Gasification And Melting Of Waste (AREA)
EP89101714A 1988-02-25 1989-02-01 Improved automatic combustion control method for a rotary combustor Expired - Lifetime EP0329984B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US16045188A 1988-02-25 1988-02-25
US160451 1988-02-25

Publications (3)

Publication Number Publication Date
EP0329984A2 EP0329984A2 (en) 1989-08-30
EP0329984A3 EP0329984A3 (en) 1990-07-18
EP0329984B1 true EP0329984B1 (en) 1994-09-14

Family

ID=22576948

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89101714A Expired - Lifetime EP0329984B1 (en) 1988-02-25 1989-02-01 Improved automatic combustion control method for a rotary combustor

Country Status (11)

Country Link
EP (1) EP0329984B1 (pt)
JP (1) JPH01302018A (pt)
KR (1) KR0128279B1 (pt)
AR (1) AR240200A1 (pt)
AT (1) ATE111586T1 (pt)
AU (1) AU607576B2 (pt)
BR (1) BR8900764A (pt)
DE (1) DE68918131D1 (pt)
GR (1) GR890100107A (pt)
IL (1) IL89137A0 (pt)
PT (1) PT89808B (pt)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07111247B2 (ja) * 1989-11-10 1995-11-29 石川島播磨重工業株式会社 廃棄物処理方法
US5031549A (en) * 1990-10-04 1991-07-16 Westinghouse Electric Corp. Method of introducing air into a rotary combustor
JPH058219U (ja) * 1991-07-10 1993-02-05 日立造船株式会社 燃焼用回転炉
KR101879089B1 (ko) * 2016-12-22 2018-07-16 주식회사 포스코 연소기
JP7307294B1 (ja) * 2023-04-06 2023-07-11 三菱重工環境・化学エンジニアリング株式会社 回転式ごみ焼却炉システム

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3822651A (en) * 1973-09-04 1974-07-09 D Harris Water cooled kiln for waste disposal
US3861336A (en) * 1973-11-07 1975-01-21 Shinzaburo Koyanagi Garbage incinerator
US4066024A (en) * 1975-12-24 1978-01-03 Oconnor Chadwell Rotating fluidized bed combustor
US4395958A (en) * 1981-12-21 1983-08-02 Industronics, Inc. Incineration system
JPS6246119A (ja) * 1985-08-23 1987-02-28 Nippon Kokan Kk <Nkk> ごみ焼却炉の燃焼制御方法
JPS6246118A (ja) * 1985-08-23 1987-02-28 Nippon Kokan Kk <Nkk> ごみ焼却炉の燃焼制御方法
US4782766A (en) * 1987-02-25 1988-11-08 Westinghouse Electric Corp. Automatic combustion control for a rotary combustor

Also Published As

Publication number Publication date
JPH01302018A (ja) 1989-12-06
AU2868989A (en) 1989-08-31
PT89808A (pt) 1989-10-04
KR0128279B1 (ko) 1998-04-09
EP0329984A2 (en) 1989-08-30
AU607576B2 (en) 1991-03-07
EP0329984A3 (en) 1990-07-18
BR8900764A (pt) 1989-10-17
KR890013422A (ko) 1989-09-23
PT89808B (pt) 1994-02-28
DE68918131D1 (de) 1994-10-20
IL89137A0 (en) 1989-09-10
ATE111586T1 (de) 1994-09-15
GR890100107A (el) 1994-03-31
AR240200A1 (es) 1990-02-28

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