CA1209350A - High temperature gas system - Google Patents
High temperature gas systemInfo
- Publication number
- CA1209350A CA1209350A CA000405783A CA405783A CA1209350A CA 1209350 A CA1209350 A CA 1209350A CA 000405783 A CA000405783 A CA 000405783A CA 405783 A CA405783 A CA 405783A CA 1209350 A CA1209350 A CA 1209350A
- Authority
- CA
- Canada
- Prior art keywords
- hopper
- fluidized bed
- rotary flow
- bed furnace
- gas
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
- F02C3/20—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products
- F02C3/205—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products in a fluidised-bed combustor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
- F23J15/027—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using cyclone separators
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
- Supports For Pipes And Cables (AREA)
- Incineration Of Waste (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
Abstract of the Disclosure High temperature gas system, including a rotary flow centrifugal separator having a hopper and means connected to the hopper for removing gas from the hopper by suction, a fluidized bed furnace connected upstream of the rotary flow centrifugal separator, a gas turbine connected downstream of the rotary flow centrifugal separator, and means connected to the gas removing means for returning at least part of the gas removed from the hopper by suction to the fluidized bed furnace.
Description
~?0~3~-iO
The invention relates to a high temperature or hot gas system, wherein a rotation or rotary flow centrifugal separator with a suction device for its bunker chamber or hopper is disposed between a fluidized bed furnace and a gas turbine.
To improve the effectiveness or efficiency of power plants opera-ting with coal as the basic fuel, the so-called fluidized bed furnace has been used to an increasing extent lately. In this type of furnace the exhaust or flue gases have, for example, a temperature of 900C and up to 12 atmospheres gauge pressure, and are to be utilized further in gas turbines. It is under-standable that the exhaust gases must be first thoroughly purified. For this purpose the use of a rotary flow or tornado centrifugal separator has been proposed (see AIChE-Symposium-Series, No. 126, Volume 68, pages 270 to 271).
A centrifugal separator of this type for the disposition of particles from gases, includes a cylindrical spin or centrifugal chamber, a coaxial feed tube for the crude gas ending in a pre-spin nozzle, a bunker shield or hopper sur-rounding the feed or inlet tube having a discharge slot for the particles leading into the chamber adjacent the periphery of the spin chamber, an outlet for the purified gas opposite the spin chamber, an auxiliary gas outlet sur-rounding the outlet for the purified gas, and an inlet for auxiliary gas which is blown into the device tangentially and at an incline.
To increase the separation efficiency of a centrifugal separator used in a fluidized bed furnace~ it is already known to connect the hopper, through a pipeline which can be regulated, to a point of the dust removal sys-tem or centrifugal separator, at which the pressure is lower than the pressure in the hopper. In this way, a relatively negative pressure can be produced in the hopper, and thus the amount of removed dust discharged through the output slot can be increased (see, for example United States Patent No. 4,272,260).
l~Os;~sa It is accordingly an object of the invention to provide a high temperature gas system, which overcomes the hereinafore-mentioned disadvantages of the heretofore--known devices of this general type, and to increasethe total efficiency of a system of this type.
With the foregoing and other objects in view there is provided, in accordance with the invention, a high temperature gas system, comprising a rotary flow centrifugal separator having a hopper or bunker and means connected to the hopper for removing gas from the hopper by suction, a fluidized bed furnace connected upstream of the rotary flow centrifugal separator, a gas turbine connected downstream of the rotary flow centrifugal separator, and means connected to the gas removing means for returning at le~st part of the gas removed from the hopper by suction to the fluidized bed furnace. Since in the invention the greater part of the gas, or all of the sucked-off gas, can be circulated in actual practice, only very little energy is lost; ~im~lly per-haps only the energy required to maintain the pressure.
In accordance with another feature of the invention, there is provided a heat exchanger and means for tapping combustion air from the fluid-ized bed furnace through the heat exchanger disposed in the fluidized bed furnace to the rotary flow centrifugal separator for use as secondary air for creating rotary flow in the separator.
In accordance with a further feature of the invention, there is provided a cyclone separator disposed between the fluidized bed furnace and the rotary flow centrifugal separator, and means for returning products separated in the cyclone separator to the fluidized bed furnace.
In accordance with an added feature of the invention, the means for removing gas from the hopper includes a blower.
In accordance with a concomitant feature of the invention, the means ~209~S0 for returning at least part of the gas removed from the hopper to the fluidized bed furnace includes an additional rotary flow centrifugal separator, for cleaning the gas removed from the hopper, and means for supplying combustion air of the fluidized bed furnace as secondary air to the additional rotary flow centrifugal separator to effect rotary flow.
Other features which are considered as characteristic for the invention are set forth in the appended claims.
Although the invention is illustrated and described herein as em-bodied in a high temperature gas system, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.
The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings, in which:
Figure 1 is a diagrammatic elevational view of a system according to the invention, including a fluidized bed furnace, a centrifugal or rotary flow separator and a gas turbine connected thereto; and Figures 2 and 3 are views similar to Figure 1 showing modifications of the system according to Figure 1, with respect to the exhaust of the bunker.
Referring now to the figures of the drawing and first particularly to Figure 1, thereof, it is seen that the combustion or flue gases from a fluidized bed furnace l are conducted to a cyclone separator 2, for example at a temperature of 900C and at 8 atmospheres gauge pressure 8 atu), for separat-ing the coarse particles. As shown in the drawing, the separated soot and ash particles are fed back through apipeline 21 by means of a feeding device 15 1209~
(see, for example, the publication VDI-Berichte, 1978, No. 322, pages 80 and 81) into the fluidized bed furnace, together with coal 13 which is to be burned, while the combustion gases which leave the cyclone 2 through a line 22 are conducted to a centrifugal rotary flow separator 3 for a further purifi-cation of the combustion gas. From the separator 3, the purified gas is fed through a diagrammatically illustrated line 31 to a gas turbine 4 which drives a generator 5. From the turbine 4, the gas flows through a heat exchanger 7 and a line 71 to a smokestack 72.
Combustion air for the fluidized bed furnace 1 is drawn in through the heat exchanger 7 by a condenser 6, which is also driven by the gas turbine 4. In a heating tube 11, which is provided in the fluidized bed furnace 1, hot or superheated steam is generated for driving a steam turbine 8, which works in conjunction with a generator 82 and a condenser 81.
Secondary air required for the operation of the rotary flow centri-fugal separator 3 is taken from the combustion air supply downstream of the condenser 6 in order to create flow circulation, and conducted to the centri-fugal separator 3 through a heat exchanger 12 which is disposed in the fluidized bed furnace 1, and through a line-32.
The ashes deposited in the hopper or bunker chamber 36 of the centrifugal separator 3 are removed through a bunker outlet 33. To increase the effectiveness of the centrifugal rotary 10w separator 3, dust laden, hot air is drawn by suction from the bunker chamber or hopper 36 and is conducted back into the fluidized bed furnace 1 through a line 34. The eeding device 15 through which crushed coal 13 is fed under pressure into the fluidized bed furnace 1, also serves for feeding the hot air back into the-furnace. For this purpose, compressed air is tapped off from the outlet of the condenser 6 through a line 14, to serve as delivery air.
lZ(~
In the apparatus shown in Figure 2, the cyclone has been omitted. A blower 35 is disposed in the line 34 which leads back from the bunker chamber or hopper 36 of the centrifugal rotary flow separator 3 to the fluidized bed furnace 1.
In the apparatus shown in Figure 3, an additional rotary flow centrifugal separator 9 is provided between the suction means in the bunker chamber or hopper 36 of the centrifugal separator 3 and the feedback line of the sucked off bunker or hopper air leading to the fluidized bed furnace 1. The drawn off gases from the bunker chamber or hopper 36 reach the centrifugal separator 9 as raw or crude gas ~hrough the line 34, and leave the separa-tor in a purified state. The purified gases are conducted to the fluidized bed furnace 1 through a line 92. The ash particles and soot particles disposed in the bin or hopper 91 of the rotary flow centrifugal separator 9 are fed into the feed hopper for the coal 13. A line 93 is provided for supplying secondary air for the centrifugal rotary flow dust separator 9, which allows a part of the combustion air to be branched off from the outlet of the condenser or compressor 6. The secondary air flowing through the line 93 can also be conducted through a non-illustrated heat exchanger disposed in the fluidized bed furnace. The secondary air for the centrifugal rotary flow separator 3 is taken from the crude gas flowing through the line 35.
The invention relates to a high temperature or hot gas system, wherein a rotation or rotary flow centrifugal separator with a suction device for its bunker chamber or hopper is disposed between a fluidized bed furnace and a gas turbine.
To improve the effectiveness or efficiency of power plants opera-ting with coal as the basic fuel, the so-called fluidized bed furnace has been used to an increasing extent lately. In this type of furnace the exhaust or flue gases have, for example, a temperature of 900C and up to 12 atmospheres gauge pressure, and are to be utilized further in gas turbines. It is under-standable that the exhaust gases must be first thoroughly purified. For this purpose the use of a rotary flow or tornado centrifugal separator has been proposed (see AIChE-Symposium-Series, No. 126, Volume 68, pages 270 to 271).
A centrifugal separator of this type for the disposition of particles from gases, includes a cylindrical spin or centrifugal chamber, a coaxial feed tube for the crude gas ending in a pre-spin nozzle, a bunker shield or hopper sur-rounding the feed or inlet tube having a discharge slot for the particles leading into the chamber adjacent the periphery of the spin chamber, an outlet for the purified gas opposite the spin chamber, an auxiliary gas outlet sur-rounding the outlet for the purified gas, and an inlet for auxiliary gas which is blown into the device tangentially and at an incline.
To increase the separation efficiency of a centrifugal separator used in a fluidized bed furnace~ it is already known to connect the hopper, through a pipeline which can be regulated, to a point of the dust removal sys-tem or centrifugal separator, at which the pressure is lower than the pressure in the hopper. In this way, a relatively negative pressure can be produced in the hopper, and thus the amount of removed dust discharged through the output slot can be increased (see, for example United States Patent No. 4,272,260).
l~Os;~sa It is accordingly an object of the invention to provide a high temperature gas system, which overcomes the hereinafore-mentioned disadvantages of the heretofore--known devices of this general type, and to increasethe total efficiency of a system of this type.
With the foregoing and other objects in view there is provided, in accordance with the invention, a high temperature gas system, comprising a rotary flow centrifugal separator having a hopper or bunker and means connected to the hopper for removing gas from the hopper by suction, a fluidized bed furnace connected upstream of the rotary flow centrifugal separator, a gas turbine connected downstream of the rotary flow centrifugal separator, and means connected to the gas removing means for returning at le~st part of the gas removed from the hopper by suction to the fluidized bed furnace. Since in the invention the greater part of the gas, or all of the sucked-off gas, can be circulated in actual practice, only very little energy is lost; ~im~lly per-haps only the energy required to maintain the pressure.
In accordance with another feature of the invention, there is provided a heat exchanger and means for tapping combustion air from the fluid-ized bed furnace through the heat exchanger disposed in the fluidized bed furnace to the rotary flow centrifugal separator for use as secondary air for creating rotary flow in the separator.
In accordance with a further feature of the invention, there is provided a cyclone separator disposed between the fluidized bed furnace and the rotary flow centrifugal separator, and means for returning products separated in the cyclone separator to the fluidized bed furnace.
In accordance with an added feature of the invention, the means for removing gas from the hopper includes a blower.
In accordance with a concomitant feature of the invention, the means ~209~S0 for returning at least part of the gas removed from the hopper to the fluidized bed furnace includes an additional rotary flow centrifugal separator, for cleaning the gas removed from the hopper, and means for supplying combustion air of the fluidized bed furnace as secondary air to the additional rotary flow centrifugal separator to effect rotary flow.
Other features which are considered as characteristic for the invention are set forth in the appended claims.
Although the invention is illustrated and described herein as em-bodied in a high temperature gas system, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.
The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings, in which:
Figure 1 is a diagrammatic elevational view of a system according to the invention, including a fluidized bed furnace, a centrifugal or rotary flow separator and a gas turbine connected thereto; and Figures 2 and 3 are views similar to Figure 1 showing modifications of the system according to Figure 1, with respect to the exhaust of the bunker.
Referring now to the figures of the drawing and first particularly to Figure 1, thereof, it is seen that the combustion or flue gases from a fluidized bed furnace l are conducted to a cyclone separator 2, for example at a temperature of 900C and at 8 atmospheres gauge pressure 8 atu), for separat-ing the coarse particles. As shown in the drawing, the separated soot and ash particles are fed back through apipeline 21 by means of a feeding device 15 1209~
(see, for example, the publication VDI-Berichte, 1978, No. 322, pages 80 and 81) into the fluidized bed furnace, together with coal 13 which is to be burned, while the combustion gases which leave the cyclone 2 through a line 22 are conducted to a centrifugal rotary flow separator 3 for a further purifi-cation of the combustion gas. From the separator 3, the purified gas is fed through a diagrammatically illustrated line 31 to a gas turbine 4 which drives a generator 5. From the turbine 4, the gas flows through a heat exchanger 7 and a line 71 to a smokestack 72.
Combustion air for the fluidized bed furnace 1 is drawn in through the heat exchanger 7 by a condenser 6, which is also driven by the gas turbine 4. In a heating tube 11, which is provided in the fluidized bed furnace 1, hot or superheated steam is generated for driving a steam turbine 8, which works in conjunction with a generator 82 and a condenser 81.
Secondary air required for the operation of the rotary flow centri-fugal separator 3 is taken from the combustion air supply downstream of the condenser 6 in order to create flow circulation, and conducted to the centri-fugal separator 3 through a heat exchanger 12 which is disposed in the fluidized bed furnace 1, and through a line-32.
The ashes deposited in the hopper or bunker chamber 36 of the centrifugal separator 3 are removed through a bunker outlet 33. To increase the effectiveness of the centrifugal rotary 10w separator 3, dust laden, hot air is drawn by suction from the bunker chamber or hopper 36 and is conducted back into the fluidized bed furnace 1 through a line 34. The eeding device 15 through which crushed coal 13 is fed under pressure into the fluidized bed furnace 1, also serves for feeding the hot air back into the-furnace. For this purpose, compressed air is tapped off from the outlet of the condenser 6 through a line 14, to serve as delivery air.
lZ(~
In the apparatus shown in Figure 2, the cyclone has been omitted. A blower 35 is disposed in the line 34 which leads back from the bunker chamber or hopper 36 of the centrifugal rotary flow separator 3 to the fluidized bed furnace 1.
In the apparatus shown in Figure 3, an additional rotary flow centrifugal separator 9 is provided between the suction means in the bunker chamber or hopper 36 of the centrifugal separator 3 and the feedback line of the sucked off bunker or hopper air leading to the fluidized bed furnace 1. The drawn off gases from the bunker chamber or hopper 36 reach the centrifugal separator 9 as raw or crude gas ~hrough the line 34, and leave the separa-tor in a purified state. The purified gases are conducted to the fluidized bed furnace 1 through a line 92. The ash particles and soot particles disposed in the bin or hopper 91 of the rotary flow centrifugal separator 9 are fed into the feed hopper for the coal 13. A line 93 is provided for supplying secondary air for the centrifugal rotary flow dust separator 9, which allows a part of the combustion air to be branched off from the outlet of the condenser or compressor 6. The secondary air flowing through the line 93 can also be conducted through a non-illustrated heat exchanger disposed in the fluidized bed furnace. The secondary air for the centrifugal rotary flow separator 3 is taken from the crude gas flowing through the line 35.
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. High temperature gas system, comprising a rotary flow centrifugal separator having a hopper and means connected to said hopper for removing gas from said hopper by suction, a fluidized bed furnace connected upsteam of said rotary flow centrifugal separator, a gas turbine connected downstream of said rotary flow centrifugal separator, and means connected to said gas removing means for returning at least part of the gas removed from said hopper by suction to said fluidized bed furnace.
2. High temperature gas system according to claim 1, including a heat exchanger and means for tapping combustion air from said fluidized bed furnace through said heat exchanger to said rotary flow centrifugal separator for use as secondary air for creating rotary flow in said separator.
3. High temperature gas system according to claim 1, including a cyclone separator disposed between said fluidized bed furnace and said rotary flow centrifugal separator, and means for returning products separated in said cyclone separator to said fluidized bed furnace.
4. High temperature gas system according to claim 1, wherein said means for removing gas from said hopper includes a blower.
5. High temperature gas system according to claim 1, wherein said means for returning at least part of the gas removed from said hopper to said fluidized bed furnace includes an additional rotary flow centrifugal separator, and means for supplying combustion air of said fluidized bed furnace as secon-dary air to said additional rotary flow centrifugal separator.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19813124832 DE3124832A1 (en) | 1981-06-24 | 1981-06-24 | HOT GAS SYSTEM |
| DEP3124832.2 | 1981-06-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1209350A true CA1209350A (en) | 1986-08-12 |
Family
ID=6135286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000405783A Expired CA1209350A (en) | 1981-06-24 | 1982-06-23 | High temperature gas system |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0069243B1 (en) |
| JP (1) | JPS5815722A (en) |
| AU (1) | AU8514782A (en) |
| CA (1) | CA1209350A (en) |
| DE (1) | DE3124832A1 (en) |
| IN (1) | IN155429B (en) |
| ZA (1) | ZA824450B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0229372Y2 (en) * | 1984-09-26 | 1990-08-07 | ||
| FI75505C (en) * | 1985-01-11 | 1988-07-11 | Ahlstroem Oy | FARING MATERIALS FOR FISHING MATERIALS FROM FAST MATERIAL TO A FREON AND REACTOR WITH A CIRCULAR BEDD. |
| DE3613300A1 (en) * | 1986-04-19 | 1987-10-22 | Bbc Brown Boveri & Cie | METHOD FOR GENERATING ELECTRICAL ENERGY WITH A COMBINED GAS TURBINE VAPOR POWER PLANT HAVING A FLUIDIZED BOTTOM BURNER, AND SYSTEM FOR IMPLEMENTING THE METHOD |
| US4688521A (en) * | 1986-05-29 | 1987-08-25 | Donlee Technologies Inc. | Two stage circulating fluidized bed reactor and method of operating the reactor |
| DE3702892A1 (en) * | 1987-01-31 | 1988-08-11 | Rheinische Braunkohlenw Ag | METHOD AND DEVICE FOR TREATING GRAINY SOLIDS IN A FLUID BED |
| CN102213415A (en) * | 2011-04-28 | 2011-10-12 | 广州迪森热能技术股份有限公司 | Preparation system of biomass fume |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB861924A (en) * | 1956-05-24 | 1961-03-01 | Babcock & Wilcox Ltd | Improvements in or relating to binary fluid power plants |
| US3401124A (en) * | 1964-10-26 | 1968-09-10 | Exxon Research Engineering Co | Recovering energy from flue gas |
| DE2113599B2 (en) * | 1971-03-20 | 1975-03-13 | Maschinenfabrik Augsburg-Nuernberg Ag, 8900 Augsburg | Method and device for separating solid components from a hot fuel gas generated in a reactor |
| US3972180A (en) * | 1971-09-21 | 1976-08-03 | Chicago Bridge & Iron Company | High pressure reactor with turbo expander |
| DE2650491C2 (en) * | 1976-11-04 | 1982-10-07 | Steag Ag, 4300 Essen | Gas-steam turbine system for generating electrical energy |
| DE2820233C2 (en) * | 1978-05-09 | 1985-08-29 | Kraftwerk Union AG, 4330 Mülheim | Rotary flow vortex |
| US4223529A (en) * | 1979-08-03 | 1980-09-23 | General Electric Company | Combined cycle power plant with pressurized fluidized bed combustor |
| GB2057060B (en) * | 1979-08-27 | 1983-07-06 | Gen Electric | Integrated coal fired gas turbine power plant |
-
1981
- 1981-06-24 DE DE19813124832 patent/DE3124832A1/en not_active Withdrawn
-
1982
- 1982-04-21 IN IN442/CAL/82A patent/IN155429B/en unknown
- 1982-06-11 EP EP82105135A patent/EP0069243B1/en not_active Expired
- 1982-06-23 CA CA000405783A patent/CA1209350A/en not_active Expired
- 1982-06-23 JP JP57108255A patent/JPS5815722A/en active Pending
- 1982-06-23 ZA ZA824450A patent/ZA824450B/en unknown
- 1982-06-23 AU AU85147/82A patent/AU8514782A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DE3124832A1 (en) | 1983-01-13 |
| ZA824450B (en) | 1983-04-27 |
| EP0069243B1 (en) | 1986-11-26 |
| JPS5815722A (en) | 1983-01-29 |
| IN155429B (en) | 1985-01-26 |
| EP0069243A1 (en) | 1983-01-12 |
| AU8514782A (en) | 1983-01-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |