EP0513159B1 - A method of supplying coal and sulphur absorbent to a combustor, and a power plant in which the method is applied - Google Patents
A method of supplying coal and sulphur absorbent to a combustor, and a power plant in which the method is applied Download PDFInfo
- Publication number
- EP0513159B1 EP0513159B1 EP91903931A EP91903931A EP0513159B1 EP 0513159 B1 EP0513159 B1 EP 0513159B1 EP 91903931 A EP91903931 A EP 91903931A EP 91903931 A EP91903931 A EP 91903931A EP 0513159 B1 EP0513159 B1 EP 0513159B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coal
- fraction
- combustor
- coarser
- paste
- 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
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/16—Fluidised bed combustion apparatus specially adapted for operation at superatmospheric pressures, e.g. by the arrangement of the combustion chamber and its auxiliary systems inside a pressure vessel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J7/00—Arrangement of devices for supplying chemicals to fire
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
- F23K1/02—Mixing solid fuel with a liquid, e.g. preparing slurries
Definitions
- the invention relates to method of supplying coal and sulphur absorbent to a combustor according to the precharacterising part of claim 1. Such a method is known from the US-A-4 259 911.
- the invention also relates to a power plant in which the method is applied.
- the invention relates to a method of supplying coal and sulphur absorbent to a combustor with combustion in a fluidized bed of particulate material. It is primarily intended for a plant with combustion of the coal at a pressure considerably above the atmospheric pressure, i.e. in a PFBC plant. PFBC are the initial letters of the expression Pressurized Fluidized Bed Combustion. The invention also relates to a power plant for application of the method.
- Coal and absorbent are crushed and mixed.
- a paste is prepared by the addition of water and possibly some emulsifying agent or oil which improves the transport properties of the paste.
- the paste is pumped into the bed via nozzles.
- This method is used for coal with a high ash content and/or a high sulphur content. No addition of water, which reduces the efficiency, is necessary. However, energy-demanding drying of the crushed material is required to prevent moist fine-grained material to clog lock hopper and transport systems. Dry fine-grained pulverized coal also entails an explosion hazard which may require inert gas in the lock hopper system, which greatly increases both the investment and the operating costs.
- Coal is crushed and fed as a paste.
- Absorbent is crushed and fed in dry state.
- the finer fraction of the crushed coal is mixed with recycled coal char solids, and the mixture is then transported in dry state pneumatically and in dense face mode to the fluidized bed, where it is first preheated before being injected into the fluidized bed.
- the coarser fraction of the crushed coal is mixed with limestone and then fed above the fluidized bed into the combustor.
- coal is crushed into a maximum grain size suitable for feeding into and combustion in a fluidized bed.
- This crushed coal is divided into a coarser and a finer fraction.
- the finer fraction suitably contains coal particles smaller than about 0.5-1.0 mm and the coarser fraction contains coal particles between about 0.5-1.0 mm and about 7 mm.
- This coarser coal fraction is supplied pneumatically to the combustor via a lock hopper system and nozzles, either separately or together with crushed sulphur absorbent. Because fine coal particles have been separated, the explosion hazard is eliminated in case of storage in pressurized containers and the risk of clogging of the transport devices is reduced in case of pneumatic transport.
- a device described in Swedish patent application 8502301-8 may also be used.
- a paste is prepared by the addition of water and possibly an emulsifier or oil. Since paste is prepared only from a smaller amount of fuel, the addition of water in relation to the total fuel quantity, and hence the efficiency losses, are insignificant. Since paste is prepared only from fine-grained material, good pumpability of the paste may be obtained with a low water content since the paste is free from coarse particles which tend to sediment and cause clogging of conveying pipes.
- the need to achieve a well-balaced size distribution of the crushed material during the crushing is in all essentials eliminated, the crushing is simplified and the energy consumption for the crushing of the coal is reduced, the explosion hazard is reduced and the water supply to the combustor is insignificant and hence the efficiency losses by the water supply.
- the containers in the lock hopper system may be pressurized with air, and inert gas (which is very expensive) does not have to be used.
- Fuel nozzles may be placed relatively sparsely and within a limited region vertically near the air nozzles of the combustor bottom.
- 10 designates a combustor which is placed inside a pressure vessel 12.
- the space 13 is supplied with compressed combustion air from a compressor (not shown) via a conduit 14.
- the combustor 10 contains a fluidizable bed of particulate material 16, in which a fuel is burnt.
- the combustor 10 further accomodates tubes 18 for generation of steam for a steam turbine (not shown) and for cooling of the bed 16.
- Combustion gases leaving the bed 16 are collected in the freeboard 20, are conducted in the conduit 22 to a cleaning plant 24, symbolized by a cyclone 24, in which dust is separated, and from the cyclone the gases are forwarded in a conduit 26 to a gas turbine (not shown). Separated dust is discharged from the cyclone 24 via the conduit 28.
- Fuel paste is pumped to the combustor via the conduit 30 and the nozzles 32.
- a coarser fuel fraction and sulphur absorbent are supplied to the combustor 10 via the conduit 34 and the nozzles 36.
- the combustor 10 is supplied with air from the space 13 via nozzles 38 for fluidization of the material in the bed 16 and combustion of the supplied fuel.
- Coal from a fuel storage 40 is crushed in a mill 42 and divided into a finer fraction 44 and a coarser fraction 46 in a screening plant 48.
- Sulphur absorbent from an absorbent storage 50 is crushed in a crusher 52.
- the coarse coal fraction 46 and the sulphur absorbent are transported pneumatically via the conduit 54 to a storage container 56 by means of transport gas from the compressor 58.
- Via a lock hopper system with the containers 62 and 64 and the valves 66 and 68 and a rotary vane feeder 70 coal and absorbent are fed to the conveying pipe 34 and further via the nozzles 36 into the bed.
- the transport gas consists of air which is taken from the pressure vessel 12 via the conduit 72. In the booster compressor 74 the pressure is increased.
- the container 62 in the lock hopper system 60 must be capable of being pressurized and pressure-relieved.
- the container 62 is connected to a pressure medium source (not shown) via a conduit 61 with a valve 63. Because of the absence of fine coal particles there is no explosion hazard and the container 62 need not be pressurized with inert gas but may be pressurized with air. This means a considerable advantage and simplification of the plant.
- the container 62 is connected to a conduit 65 with a valve 67.
- the conduit 65 leads to a space with atmospheric pressure.
- the boundary between what should be regarded as small and large particles normally lies within the range 0.5-1.0 mm.
- the maximum size for large particles should usually not exceed about 7 mm.
- the finer coal fraction 44 is transported to a container 76, is mixed with water and possiby other additives and is prepared while being stirred with a stirrer 78 into a pumpable fuel paste 80.
- This paste 80 is pumped with a paste pump 82 via the conduit 30 and the nozzles 32 to the combustor 10.
- the finer coal fraction 44 may be transported to the container 76 by a mechanical transport device or, as shown in the figure, by a pneumatic transport device. In the latter case, one part of the screening plant is connected to the conveying pipe 84. Propellent gas is obtained from the compressor 58. Coal and transport gas are separated in the cyclone 86 above the container 76 and fall down into this.
- the transport gas may be washed with water in a scrubber 88 so that dust remaining in the transport gas is removed.
- Transport gas for the coarse coal fraction 46 and for the absorbent may be conducted from the container 56 through the conduit 90 to the cyclone 86 and the scrubber 88 and be cleaned there.
Abstract
Description
- The invention relates to method of supplying coal and sulphur absorbent to a combustor according to the precharacterising part of claim 1. Such a method is known from the US-A-4 259 911. The invention also relates to a power plant in which the method is applied.
- The invention relates to a method of supplying coal and sulphur absorbent to a combustor with combustion in a fluidized bed of particulate material. It is primarily intended for a plant with combustion of the coal at a pressure considerably above the atmospheric pressure, i.e. in a PFBC plant. PFBC are the initial letters of the expression Pressurized Fluidized Bed Combustion. The invention also relates to a power plant for application of the method.
- In hitherto designed power plants of the above kind, any of the following feeding systems has been used:
- a) Coal and absorbent are crushed and mixed. Of the crushed material a paste is prepared by the addition of water and possibly some emulsifying agent or oil which improves the transport properties of the paste. The paste is pumped into the bed via nozzles.
- This method has certain disadvantages and limitations. To obtain good transport properties of the paste, the distribution of the particle size is very important. This places heavy demands on crushing equipment and supervision of the particle size distribution. From an economic point of view, the method can only be used for high quality coal with a low sulphur content and ash content. For coal which is rich in ash and coal with a high sulphur content, which requires a high percentage of sulphur absorbent, the water content relative to the coal quantity will be high, which has a greatly negative influence on the efficiency of the plant.
- b) Coal and sulphur absorbent are crushed and dried, whereupon feeding to the bed takes place via a lock hopper system .
- This method is used for coal with a high ash content and/or a high sulphur content. No addition of water, which reduces the efficiency, is necessary. However, energy-demanding drying of the crushed material is required to prevent moist fine-grained material to clog lock hopper and transport systems. Dry fine-grained pulverized coal also entails an explosion hazard which may require inert gas in the lock hopper system, which greatly increases both the investment and the operating costs.
- When feeding fine-grained pulverized coal in dry state, a plurality of feeding points are required to obtain a uniform temperature distribution. These feeding points must be located near each other in the lateral direction (≦ 1 m between the feeding points). In addition, in order to obtain good combustion, the bed must be high (2-3 m).
- Otherwise there is a risk that the fine-grained coal particles blow off before they have burnt up.
- If the bed is made high, also fuel nozzles must be positioned at different levels in the bed to avoid too high temperatures in the bottom zone, which would entail a risk of sintering.
- As will be seen, there are considerable difficulties connected with the feeding of fine-grained coal in dry state.
- c) Coal is crushed and fed as a paste. Absorbent is crushed and fed in dry state.
- All coal must be crushed into a grain size suitable for the preparation of a paste. This means that the coal must be crushed into a grain size which, on average, is small and that the crushing cost will be high.
- In the method according to the US-A-4 259 911 the finer fraction of the crushed coal is mixed with recycled coal char solids, and the mixture is then transported in dry state pneumatically and in dense face mode to the fluidized bed, where it is first preheated before being injected into the fluidized bed. The coarser fraction of the crushed coal is mixed with limestone and then fed above the fluidized bed into the combustor.
- The Patent Abstract of JP 55-131617, volume 4, no 183 (M-47)(665) describes a system to supply coal fuel into a combustion furnace which comprises no fluidized bed. Nor is any sulphur absorbent supplied to the combustor. The coal is first crushed, and then the entire amount of crushed coal is mixed with fuel oil to provide a slurry. This slurry is then fed to a classifier where a rough separation of the finer fraction and the coarser fraction of the coal particles takes place simply by precipitation. The slurry with the greater portion of coarse coal particles is fed from the bottom of the classifier to a separator where it is de-oiled and then fed to the combustion furnace. The slurry with the greater portion of fine coal particles is fed to a concentrator and from there to the combustion furnace.
- According to the invention, coal is crushed into a maximum grain size suitable for feeding into and combustion in a fluidized bed. This crushed coal is divided into a coarser and a finer fraction. The finer fraction suitably contains coal particles smaller than about 0.5-1.0 mm and the coarser fraction contains coal particles between about 0.5-1.0 mm and about 7 mm.
- This coarser coal fraction is supplied pneumatically to the combustor via a lock hopper system and nozzles, either separately or together with crushed sulphur absorbent. Because fine coal particles have been separated, the explosion hazard is eliminated in case of storage in pressurized containers and the risk of clogging of the transport devices is reduced in case of pneumatic transport. For dispensing and pressurization, a device described in Swedish patent application 8502301-8 may also be used.
- Of the finer fraction, which may entail an explosion hazard, a paste is prepared by the addition of water and possibly an emulsifier or oil. Since paste is prepared only from a smaller amount of fuel, the addition of water in relation to the total fuel quantity, and hence the efficiency losses, are insignificant. Since paste is prepared only from fine-grained material, good pumpability of the paste may be obtained with a low water content since the paste is free from coarse particles which tend to sediment and cause clogging of conveying pipes.
- By the invention, the need to achieve a well-balaced size distribution of the crushed material during the crushing is in all essentials eliminated, the crushing is simplified and the energy consumption for the crushing of the coal is reduced, the explosion hazard is reduced and the water supply to the combustor is insignificant and hence the efficiency losses by the water supply.
- Since the finer coal fraction is screened off and the lock hopper system is only supplied with the coarse coal fraction and absorbent, both the explosion hazard and the risk of clogging in the lock hopper system are reduced and more reliable feeding of fuel is obtained. Because of the reduced explosion hazard, the containers in the lock hopper system may be pressurized with air, and inert gas (which is very expensive) does not have to be used. Fuel nozzles may be placed relatively sparsely and within a limited region vertically near the air nozzles of the combustor bottom.
- The invention will be described in greater detail with reference to the accompanying figure, which schematically shows the combustor and equipment for preparation and feeding of fuel and sulphur absorbent in a PFBC power plant, in which the combustion takes place at a pressure considerably exceeding the atmospheric pressure.
- In the figure, 10 designates a combustor which is placed inside a
pressure vessel 12. Thespace 13 is supplied with compressed combustion air from a compressor (not shown) via aconduit 14. Thecombustor 10 contains a fluidizable bed ofparticulate material 16, in which a fuel is burnt. Thecombustor 10 further accomodatestubes 18 for generation of steam for a steam turbine (not shown) and for cooling of thebed 16. Combustion gases leaving thebed 16 are collected in thefreeboard 20, are conducted in theconduit 22 to acleaning plant 24, symbolized by acyclone 24, in which dust is separated, and from the cyclone the gases are forwarded in aconduit 26 to a gas turbine (not shown). Separated dust is discharged from thecyclone 24 via theconduit 28. - Fuel paste is pumped to the combustor via the
conduit 30 and thenozzles 32. A coarser fuel fraction and sulphur absorbent are supplied to thecombustor 10 via theconduit 34 and thenozzles 36. Thecombustor 10 is supplied with air from thespace 13 vianozzles 38 for fluidization of the material in thebed 16 and combustion of the supplied fuel. - Coal from a
fuel storage 40 is crushed in amill 42 and divided into afiner fraction 44 and acoarser fraction 46 in ascreening plant 48. Sulphur absorbent from anabsorbent storage 50 is crushed in acrusher 52. Thecoarse coal fraction 46 and the sulphur absorbent are transported pneumatically via theconduit 54 to astorage container 56 by means of transport gas from thecompressor 58. Via a lock hopper system with thecontainers valves rotary vane feeder 70, coal and absorbent are fed to the conveyingpipe 34 and further via thenozzles 36 into the bed. The transport gas consists of air which is taken from thepressure vessel 12 via theconduit 72. In thebooster compressor 74 the pressure is increased. Thecontainer 62 in thelock hopper system 60 must be capable of being pressurized and pressure-relieved. For pressurization thecontainer 62 is connected to a pressure medium source (not shown) via aconduit 61 with avalve 63. Because of the absence of fine coal particles there is no explosion hazard and thecontainer 62 need not be pressurized with inert gas but may be pressurized with air. This means a considerable advantage and simplification of the plant. For pressure relief thecontainer 62 is connected to aconduit 65 with avalve 67. Theconduit 65 leads to a space with atmospheric pressure. - What should be considered larger and smaller particles is dependent on the type of coal and the shape the particles receive during the crushing operation. The boundary between large and small particles is set higher if the particles in the crushed material have the shape of flakes and are rich in gas than if they are more ball-shaped and poor in gas.
- The boundary between what should be regarded as small and large particles normally lies within the range 0.5-1.0 mm. The maximum size for large particles should usually not exceed about 7 mm.
- The
finer coal fraction 44 is transported to acontainer 76, is mixed with water and possiby other additives and is prepared while being stirred with astirrer 78 into apumpable fuel paste 80. Thispaste 80 is pumped with apaste pump 82 via theconduit 30 and thenozzles 32 to thecombustor 10. Thefiner coal fraction 44 may be transported to thecontainer 76 by a mechanical transport device or, as shown in the figure, by a pneumatic transport device. In the latter case, one part of the screening plant is connected to the conveyingpipe 84. Propellent gas is obtained from thecompressor 58. Coal and transport gas are separated in thecyclone 86 above thecontainer 76 and fall down into this. The transport gas may be washed with water in ascrubber 88 so that dust remaining in the transport gas is removed. Transport gas for thecoarse coal fraction 46 and for the absorbent may be conducted from thecontainer 56 through theconduit 90 to thecyclone 86 and thescrubber 88 and be cleaned there.
Claims (10)
- A method of supplying coal and sulphur absorbent to a combustor (10) with combustion in a fluidized bed (16) of particulate material, whereby crushed coal is divided into a finer and a coarser fraction
characterized in that
a paste is prepared of the finer fraction by the addition of water and possibly oil and/or emulsifier,
this paste is pumped into the fluidized bed of the combustor via one or more first nozzles (32), and
the coarser coal fraction and crushed absorbent are supplied into the fluidised bed of the combustor pneumatically in dry state, direct or via one or more lock hopper systems (60) and one or more other nozzles (36). - Method according to claim 1, characterized in that the fine coal fraction is transported pneumatically to a cyclone and/or a scrubber (86), in which the coal fraction is separated from the transport gas and thereafter is supplied to a container (76) for preparation of the paste.
- Method according to claim 1, characterized in that the coarser coal fraction is pneumatically transported to the lock hopper device (60), that the transport gas is cleaned in a cyclone (86) and/or a scrubber (88), and that dust separated from the transport gas is mixed with the fine coal fraction and constitutes part of the prepared fuel paste.
- Method according to claim 1, characterized in that the coarser coal fraction and the sulphur absorbent are supplied to the combustor via a common lock hopper system (60).
- Method according to any of claims 2-4, characterized in that the fine coal fraction and its transport gas and dust in the transport gas for the coarser coal fraction are separated in a common cyclone and/or scrubber unit (86).
- Method according to any of claims 1 - 5, characterized in that the boundary between the particle size of the finer fraction of the crushed coal and the particle size of the coarser fraction of the crushed coal lies within the range of 0,5 - 1,0 mm.
- A power plant with a combustor (10) for combustion of coal in a bed (16) of particulate material containing a sulphur absorbent, comprising
a screening plant (48) for division of crushed coal into a finer and a coarser fraction, characterised by:
a transport device (84) for transport of the finer coal fraction to a paste preparation container (76),
devices (78) for mixing the fine coal fraction with water and/or oil for preparation of a pumpable paste (80),
a paste pump (82) for pumping the paste to nozzles (32) in the combustor (10),
one or more conveying pipes (54) for transport of the coarser coal fraction and crushed sulphur absorbent to one or more lock hopper systems (60), and
one or more dispensing and transport devices (70, 34) for feeding the coarser coal fraction and the sulphur absorbent into the combustor via nozzles (36). - Power plant according to claim 7, characterized in that the combustor (10) is pressurized, i.e. combustion takes place at a pressure considerably exceeding the atmospheric pressure.
- Power plant according to claim 7 or 8, characterized in that it comprises a pneumatic transport device (84) for transport of the finer coal fraction to a cyclone and/or a scrubber (86/88) for separation of the coal from the transport gas.
- Power plant according to claim 7 or 8, characterized in that the outlet for the transport gas from a separator (56) for separation of the coarser coal fraction and the absorbent via a conduit (90) is connected to a cyclone and/or a scrubber (86/88) for separation of the dust in the transport gas.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9000354A SE465536B (en) | 1990-02-01 | 1990-02-01 | SEAT AND DEVICE FOR SUPPLY OF COAL AND SULFUR ABSORBENT TO A FLUIDIZED BED |
SE9000354 | 1990-05-28 | ||
PCT/SE1991/000063 WO1991011659A1 (en) | 1990-02-01 | 1991-01-29 | A method of supplying coal and sulphur absorbent to a combustor, and a power plant in which the method is applied |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0513159A1 EP0513159A1 (en) | 1992-11-19 |
EP0513159B1 true EP0513159B1 (en) | 1995-04-26 |
Family
ID=20378423
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91903931A Expired - Lifetime EP0513159B1 (en) | 1990-02-01 | 1991-01-29 | A method of supplying coal and sulphur absorbent to a combustor, and a power plant in which the method is applied |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0513159B1 (en) |
JP (1) | JPH05504615A (en) |
AU (1) | AU7235591A (en) |
DE (1) | DE69109269T2 (en) |
DK (1) | DK0513159T3 (en) |
ES (1) | ES2074704T3 (en) |
FI (1) | FI101825B (en) |
SE (1) | SE465536B (en) |
WO (1) | WO1991011659A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE9403568A0 (en) * | 1994-10-19 | 1996-04-20 | Abb Carbon Ab | Method and apparatus for feeding absorbent into a fluidized bed |
AT502048B1 (en) * | 2005-09-28 | 2007-01-15 | Himmelfreundpointner Kurt | Processing plant e.g. combustion furnace, charging method, involves introducing flowing process material into processing plant via conveyor line under pressure, and mixing flowing process material before its pressurization |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4259911A (en) * | 1979-06-21 | 1981-04-07 | Combustion Engineering, Inc. | Fluidized bed boiler feed system |
US4434726A (en) * | 1982-12-27 | 1984-03-06 | Combustion Engineering, Inc. | Fine particulate feed system for fluidized bed furnace |
-
1990
- 1990-02-01 SE SE9000354A patent/SE465536B/en not_active IP Right Cessation
-
1991
- 1991-01-29 EP EP91903931A patent/EP0513159B1/en not_active Expired - Lifetime
- 1991-01-29 ES ES91903931T patent/ES2074704T3/en not_active Expired - Lifetime
- 1991-01-29 AU AU72355/91A patent/AU7235591A/en not_active Abandoned
- 1991-01-29 JP JP50402991A patent/JPH05504615A/en active Pending
- 1991-01-29 DE DE69109269T patent/DE69109269T2/en not_active Expired - Fee Related
- 1991-01-29 WO PCT/SE1991/000063 patent/WO1991011659A1/en active IP Right Grant
- 1991-01-29 DK DK91903931T patent/DK0513159T3/en active
-
1992
- 1992-07-28 FI FI923409A patent/FI101825B/en active
Also Published As
Publication number | Publication date |
---|---|
FI923409A (en) | 1992-07-28 |
ES2074704T3 (en) | 1995-09-16 |
FI923409A0 (en) | 1992-07-28 |
FI101825B1 (en) | 1998-08-31 |
FI101825B (en) | 1998-08-31 |
DE69109269D1 (en) | 1995-06-01 |
AU7235591A (en) | 1991-08-21 |
WO1991011659A1 (en) | 1991-08-08 |
JPH05504615A (en) | 1993-07-15 |
DE69109269T2 (en) | 1996-01-11 |
EP0513159A1 (en) | 1992-11-19 |
SE465536B (en) | 1991-09-23 |
SE9000354D0 (en) | 1990-02-01 |
SE9000354L (en) | 1991-08-02 |
DK0513159T3 (en) | 1995-10-02 |
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