CA1261683A - Coal feed system for a fluidized bed reactor - Google Patents
Coal feed system for a fluidized bed reactorInfo
- Publication number
- CA1261683A CA1261683A CA000492092A CA492092A CA1261683A CA 1261683 A CA1261683 A CA 1261683A CA 000492092 A CA000492092 A CA 000492092A CA 492092 A CA492092 A CA 492092A CA 1261683 A CA1261683 A CA 1261683A
- Authority
- CA
- Canada
- Prior art keywords
- bed
- particulate
- relatively
- slurry
- fine
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/0015—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor
-
- 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
- F23C10/002—Fluidised bed combustion apparatus for pulverulent solid fuel
Abstract
A COAL FEED SYSTEM FOR
A FLUIDIZED BED REACTOR
ABSTRACT OF THE DISCLOSURE
A coal feed system for a fluidized bed reactor in which a grate is supported in a housing and adapted to receive a bed of particulate material at least a portion of which is combustible. Air is passed through the grate and the par-ticulate material to fluidize the particulate material. A
relatively coarse particulate fuel material is distributed to the upper surface of the bed and a slurry containing a relatively fine particulate fuel material is distributed into the bed below the upper surface of the bed.
A FLUIDIZED BED REACTOR
ABSTRACT OF THE DISCLOSURE
A coal feed system for a fluidized bed reactor in which a grate is supported in a housing and adapted to receive a bed of particulate material at least a portion of which is combustible. Air is passed through the grate and the par-ticulate material to fluidize the particulate material. A
relatively coarse particulate fuel material is distributed to the upper surface of the bed and a slurry containing a relatively fine particulate fuel material is distributed into the bed below the upper surface of the bed.
Description
6~6~3 A COAL FEED SYSTEM FOR
A FLUIDIZED BED REACTOR
BACKGROUND OF THE INVENTION
The present invention relates to fluidized beds and, more particularly, to a coal feed system for a fluidized bed reactor.
Fluidized bed reactors, in the form of combustors, boilers, steam generators, and the like have long been recognized as an attractive and effective means of generating heat. In these arrangements, air is passed through a bed of particulate material which normally con-sists of a mixture of iner~ material and a particulate fossil fuel such as coal, to fluidize the bed and to promote the combustion of the fuel. When the heat produced by the lS fluidized bed is utilized to convert water to steam, thefluidized bed 5ystem offers an attractive combination of high heat release, improved heat transfer to surfaces within the bed and compact boiler size.
In these type arrangements, the particulate fuel material must be continuously, or at least periodically, distributed into the bed to replenish the spent material expended in the combustion process. Many of these arrange-~ . , .
.
~26~
ments utilize in-bed feeding systems in which the par-ticulate ~uel material is introduced directly into the bed from a point below the upper surface of the bed. However, these in-bed systems present problems since the lateral transfer or distribution of the materials through the bed is relati-~ely poor requiring a multiplicity of feed points to prevent hot spots or cool spots which increases the cost of the installation.
Other systems utilize a feeder for distributing the particulate fuel material from a position above the upper surface of the bed where it falls by gravity onto the latter surface. ~owcver, since a great majority of the commercial coal that is available is of a relatively large particle size range, which may extend from very small particles to and including particles that will pass through a two-inch screen, this ejection of the particulate fuel material onto the upper surface of the bed presents problems. For example the combination of the upwardly rising combustion gases and air passing through the bed will blow relatively small material 0 out the top of the combustor before it is burned.
SUMMARY OF THE INVENTION
Accordingly the present invention seeks to provide a coal feed system for a fluidized bed reactor in which an optimum distribution of a particulate fuel ~26~ 3 material of a relatively large particle size range is achieved.
Further the present invention seeks to provide a system of the above type in which the particulate fuel material is separated into a relatively coarse material which is distributed to the upper surface of the bed and a relatively fine material which is distributed into the bed at a point below the upper surface to the bed, the relatively fine material being entrained by water in the separation process to form a slurry which is injected into the bed.
~he invention in one aspect pertains to a fluidized bed reactor comprising a housing with grate means supported in the housing and adapted to receive a bed of par-ticulate material a-t least a portion of which is combustible. Means are provided for passing air through the grate means and the particulate material to fluidize the particulate material and separator means including a screen receiving particulate fuel material and separating same into relatively coarse particulate fuel material and relatively fine particulate fuel material. Means discharge water onto the screen to promote the separation of the coarse material from the fine rnaterial and form a slurry containing the fine material. Means connected to the separating means receives the relatively coarse material and distributes the relatively coarse material to the upper surface of the bed. Means connected to the separating means receives the slurry containing the relatively fine material and means is connected to the slurry receiving means for distributing the slurry into the bed below the upper surface of the bed.
Another aspect of the invention pertains to a method of operating a fluidized bed reactor comprising the steps of supporting a bed of particulate material at least a portion of which is combustible, passing air through the particulate material to fluidize the particulate material, separating a particulate fuel material into relatively coarse material and relatlvely fine material whereby the relatively fine particles pass through a screen, discharging water onto the screen to promote the separation of the coarse material from the fine material and for forming a slurry containing the fine material, distributing the relatively coarse material to the upper surface of the bed and distributing th~ slurry .into the bed below the upper surface of the bed.
DESCRIPTION OF THE DRAWING
The above brief description, as well as further objects, features, and advantages, of the present invention will be more fully appreciated by reference to the following detailed description of a presently preferred but nonetheless illustrative embodiment in accordance with the present invention, when taken in connection with the accompanying drawing which is a partial sectional partial schematic view of the reactor of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to the drawing, the reference numeral 10 refers in general to the fluidized bed reactor of the present invention in the form of a boiler consisting of a front wall 12, a rear wall 14, and two sidewalls, one of which is shown by the reference numeral 16. The upper portion of the gL2~6~683 boiler is not shown for the convenience of presentation, it being understood that it consists of a convection section, a roof and an outlet for allowing the combustion gases to discharge from the boiler, in a conventional manner.
A bed of particulate material, shown in general by the reference numeral 18, is disposed within the boiler 10 and rests on a perforated grate 20 extending horizontally in the lower portion of the boiler. The bed 18 can consist of a mixture of discrete particles of inert material and fuel 10 material such as bituminous coal.
An air plenum chamber 22 is provided immediately below the grate 20 and an air inlet 24 is provided through the rear wall 14 in communication with the chamber 22 for distributing air from an external source (not shown) to the 15 chamber. A pair of air dampers 26 are provided in the inlet 24 for controlling the flow of air into the chamber 22. The dampers 26 are suitably mounted in the inlet 24 for pivotal movement about their centers in a response to actuation of external controls (not shown) to vary the effective openings 20 in the inlet and thus Gontrol the flow of air through the inlet and into the chamber 22. Since the dampers 26 are of a conventional design they will not be de~cribed in any further detail. Although not shown in the drawing, it is understood that a bed light-off burner is mounted through the front wall 12 immediately above the grate 20 for ini-tially lighting.off the bed 18 during startup.
A screen separator, shown in general by the reference numeral 30 is located externally of the boiler 10 and i.s adapted to receive particulate fuel material, such as coal, of a relative large particle size range from an external source (not shown) via a duct 32. The separator 30 includes a screen 34 which is sized so as to permit the relatively fine particles to pass through while preventing passage of the relatively coarse particles. As an example, the screen ; can be adapted to separate particles greater that 1/16 oE an inch in dlameter from those less that 1/16 o~ an inch. The particle~ on the screen 34 are washed by water Erom three spray bars 36 disposed adjacent the separator 30. The water aids in the separation proces~ and entrains the relatively fine particles as they pass through the screen 34 into the lower portion of the separator 30.
A distributor 40 is mounted on the wall 12 of the boiler 10 and includes a hop~er 42 for receiving the coarse coal particles ~rom a duct 44 extending from the upper portion of the separator 30 above the screen 34. The distributor 40 operates to feed .the coarse coal particles 34 by gravity, ~1.261~3 onto a rotating blade assembly 46 which opera~es to propel the coarse particles through an opening in the wall 12 into the interior of the boiler 10 and onto the upper surface of the bed 18.
A storage tank 50 is located externally of the boiler 10 and receives the slurry contain:ing the fine particles from the separator 30, via a duct 52. A pump 54 extends between an inlet duct 56 connected to the tank 50 and an outlet duct 58, extending through the wall 12 to pump the slurry containing the fine particles from the tank 50 into the bed lS.
To start up the bed 18, the dampers 2~ a~sociated with the air inlet 24 are opened, and air i~ thus distributed upwardly through the chamber 22, through the perforations in the grate 20 and into the bed 18. This loosens the par-ticulate material in the bed 18 and reduces material packing and bridging.
A light-off burner is fired to heat the material in the : bed 18 until the temperature of the material reaches a pre-determined level, at which time the separator 30 and the spray bars 36 are activated to separate the fine particles from the coarse materials. The distributor 40 and the pump 54 are activated to introduce the coarse materials to the ~2~ 13 upper surface of the bed 18 and the slurry containing the fine materials into the bed.
After the bed 18 has been fluidized and has reached a predetermined elevated temperature, the light-off burner is turned off while the distributor 40 and the pump 54 con-tinue to distribute the particulate fuel to the bed 18 in accordance with predetermined feed rates.
It is thus seen that the present invention provides an effective yet simple method of insuring optimum distribution of particle fuel material of a relatively large particle 5 ize range.
. It is a still urther object of the present invention to provide a system o~ the above type which minimize9 e~cape of the relatively fine materials from the bed.
It is a still further object of the present invention to provide a system of the above type in which the com-bustion and sulfur capture efficiency of the fluidized bed are increased.
It is understood that if the reactor of the present invention is used for steam generation, a plurality of heat exchange tubes carrying water may be routed through the interior of the boiler 10 in a conventional manner with these tube3 being omitted in the drawing for the convenience of g presentation.
A latitude of modification, change and substitution is intended in the foregoing disclosure and in some instances some features of the invention will be employed without a corresponding use of other features. Accordingly, it is appropriate that the appended claims be construed broadly and in a manner consistent with the spirit and scope of the invention herein.
.
A FLUIDIZED BED REACTOR
BACKGROUND OF THE INVENTION
The present invention relates to fluidized beds and, more particularly, to a coal feed system for a fluidized bed reactor.
Fluidized bed reactors, in the form of combustors, boilers, steam generators, and the like have long been recognized as an attractive and effective means of generating heat. In these arrangements, air is passed through a bed of particulate material which normally con-sists of a mixture of iner~ material and a particulate fossil fuel such as coal, to fluidize the bed and to promote the combustion of the fuel. When the heat produced by the lS fluidized bed is utilized to convert water to steam, thefluidized bed 5ystem offers an attractive combination of high heat release, improved heat transfer to surfaces within the bed and compact boiler size.
In these type arrangements, the particulate fuel material must be continuously, or at least periodically, distributed into the bed to replenish the spent material expended in the combustion process. Many of these arrange-~ . , .
.
~26~
ments utilize in-bed feeding systems in which the par-ticulate ~uel material is introduced directly into the bed from a point below the upper surface of the bed. However, these in-bed systems present problems since the lateral transfer or distribution of the materials through the bed is relati-~ely poor requiring a multiplicity of feed points to prevent hot spots or cool spots which increases the cost of the installation.
Other systems utilize a feeder for distributing the particulate fuel material from a position above the upper surface of the bed where it falls by gravity onto the latter surface. ~owcver, since a great majority of the commercial coal that is available is of a relatively large particle size range, which may extend from very small particles to and including particles that will pass through a two-inch screen, this ejection of the particulate fuel material onto the upper surface of the bed presents problems. For example the combination of the upwardly rising combustion gases and air passing through the bed will blow relatively small material 0 out the top of the combustor before it is burned.
SUMMARY OF THE INVENTION
Accordingly the present invention seeks to provide a coal feed system for a fluidized bed reactor in which an optimum distribution of a particulate fuel ~26~ 3 material of a relatively large particle size range is achieved.
Further the present invention seeks to provide a system of the above type in which the particulate fuel material is separated into a relatively coarse material which is distributed to the upper surface of the bed and a relatively fine material which is distributed into the bed at a point below the upper surface to the bed, the relatively fine material being entrained by water in the separation process to form a slurry which is injected into the bed.
~he invention in one aspect pertains to a fluidized bed reactor comprising a housing with grate means supported in the housing and adapted to receive a bed of par-ticulate material a-t least a portion of which is combustible. Means are provided for passing air through the grate means and the particulate material to fluidize the particulate material and separator means including a screen receiving particulate fuel material and separating same into relatively coarse particulate fuel material and relatively fine particulate fuel material. Means discharge water onto the screen to promote the separation of the coarse material from the fine rnaterial and form a slurry containing the fine material. Means connected to the separating means receives the relatively coarse material and distributes the relatively coarse material to the upper surface of the bed. Means connected to the separating means receives the slurry containing the relatively fine material and means is connected to the slurry receiving means for distributing the slurry into the bed below the upper surface of the bed.
Another aspect of the invention pertains to a method of operating a fluidized bed reactor comprising the steps of supporting a bed of particulate material at least a portion of which is combustible, passing air through the particulate material to fluidize the particulate material, separating a particulate fuel material into relatively coarse material and relatlvely fine material whereby the relatively fine particles pass through a screen, discharging water onto the screen to promote the separation of the coarse material from the fine material and for forming a slurry containing the fine material, distributing the relatively coarse material to the upper surface of the bed and distributing th~ slurry .into the bed below the upper surface of the bed.
DESCRIPTION OF THE DRAWING
The above brief description, as well as further objects, features, and advantages, of the present invention will be more fully appreciated by reference to the following detailed description of a presently preferred but nonetheless illustrative embodiment in accordance with the present invention, when taken in connection with the accompanying drawing which is a partial sectional partial schematic view of the reactor of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to the drawing, the reference numeral 10 refers in general to the fluidized bed reactor of the present invention in the form of a boiler consisting of a front wall 12, a rear wall 14, and two sidewalls, one of which is shown by the reference numeral 16. The upper portion of the gL2~6~683 boiler is not shown for the convenience of presentation, it being understood that it consists of a convection section, a roof and an outlet for allowing the combustion gases to discharge from the boiler, in a conventional manner.
A bed of particulate material, shown in general by the reference numeral 18, is disposed within the boiler 10 and rests on a perforated grate 20 extending horizontally in the lower portion of the boiler. The bed 18 can consist of a mixture of discrete particles of inert material and fuel 10 material such as bituminous coal.
An air plenum chamber 22 is provided immediately below the grate 20 and an air inlet 24 is provided through the rear wall 14 in communication with the chamber 22 for distributing air from an external source (not shown) to the 15 chamber. A pair of air dampers 26 are provided in the inlet 24 for controlling the flow of air into the chamber 22. The dampers 26 are suitably mounted in the inlet 24 for pivotal movement about their centers in a response to actuation of external controls (not shown) to vary the effective openings 20 in the inlet and thus Gontrol the flow of air through the inlet and into the chamber 22. Since the dampers 26 are of a conventional design they will not be de~cribed in any further detail. Although not shown in the drawing, it is understood that a bed light-off burner is mounted through the front wall 12 immediately above the grate 20 for ini-tially lighting.off the bed 18 during startup.
A screen separator, shown in general by the reference numeral 30 is located externally of the boiler 10 and i.s adapted to receive particulate fuel material, such as coal, of a relative large particle size range from an external source (not shown) via a duct 32. The separator 30 includes a screen 34 which is sized so as to permit the relatively fine particles to pass through while preventing passage of the relatively coarse particles. As an example, the screen ; can be adapted to separate particles greater that 1/16 oE an inch in dlameter from those less that 1/16 o~ an inch. The particle~ on the screen 34 are washed by water Erom three spray bars 36 disposed adjacent the separator 30. The water aids in the separation proces~ and entrains the relatively fine particles as they pass through the screen 34 into the lower portion of the separator 30.
A distributor 40 is mounted on the wall 12 of the boiler 10 and includes a hop~er 42 for receiving the coarse coal particles ~rom a duct 44 extending from the upper portion of the separator 30 above the screen 34. The distributor 40 operates to feed .the coarse coal particles 34 by gravity, ~1.261~3 onto a rotating blade assembly 46 which opera~es to propel the coarse particles through an opening in the wall 12 into the interior of the boiler 10 and onto the upper surface of the bed 18.
A storage tank 50 is located externally of the boiler 10 and receives the slurry contain:ing the fine particles from the separator 30, via a duct 52. A pump 54 extends between an inlet duct 56 connected to the tank 50 and an outlet duct 58, extending through the wall 12 to pump the slurry containing the fine particles from the tank 50 into the bed lS.
To start up the bed 18, the dampers 2~ a~sociated with the air inlet 24 are opened, and air i~ thus distributed upwardly through the chamber 22, through the perforations in the grate 20 and into the bed 18. This loosens the par-ticulate material in the bed 18 and reduces material packing and bridging.
A light-off burner is fired to heat the material in the : bed 18 until the temperature of the material reaches a pre-determined level, at which time the separator 30 and the spray bars 36 are activated to separate the fine particles from the coarse materials. The distributor 40 and the pump 54 are activated to introduce the coarse materials to the ~2~ 13 upper surface of the bed 18 and the slurry containing the fine materials into the bed.
After the bed 18 has been fluidized and has reached a predetermined elevated temperature, the light-off burner is turned off while the distributor 40 and the pump 54 con-tinue to distribute the particulate fuel to the bed 18 in accordance with predetermined feed rates.
It is thus seen that the present invention provides an effective yet simple method of insuring optimum distribution of particle fuel material of a relatively large particle 5 ize range.
. It is a still urther object of the present invention to provide a system o~ the above type which minimize9 e~cape of the relatively fine materials from the bed.
It is a still further object of the present invention to provide a system of the above type in which the com-bustion and sulfur capture efficiency of the fluidized bed are increased.
It is understood that if the reactor of the present invention is used for steam generation, a plurality of heat exchange tubes carrying water may be routed through the interior of the boiler 10 in a conventional manner with these tube3 being omitted in the drawing for the convenience of g presentation.
A latitude of modification, change and substitution is intended in the foregoing disclosure and in some instances some features of the invention will be employed without a corresponding use of other features. Accordingly, it is appropriate that the appended claims be construed broadly and in a manner consistent with the spirit and scope of the invention herein.
.
Claims (4)
1. A fluidized bed reactor comprising a housing, grate means supported in said housing and adapted to receive a bed of particulate material at least a portion of which is combustible, means for passing air through said grate means and said particulate material to fluidize said particulate material, separator means including a screen for receiving particulate fuel material and separating same into relatively coarse particulate fuel material and relatively fine particulate fuel material, means for discharging water onto said screen to promote the separation of said coarse material from said fine material and for forming a slurry containing said fine material, means connected to said separating means for receiving said relatively coarse material and distributing said relatively coarse material to the upper surface of said bed, means connected to said separating means for receiving said slurry containing said relatively fine material and means connected to said slurry receiving means for distributing said slurry into said bed below the upper surface of said bed.
2. The reactor of claim 1 wherein said second mentioned distributing means comprises a pump for pumping said slurry into said bed.
3. A method of operating a fluidized bed reactor comprising the steps of supporting a bed of particulate material at least a portion of which is combustible, passing air through said particulate material to fluidize said particulate material, separating a particulate fuel material into relatively coarse material and relatively fine material whereby said relatively fine particles pass through a screen,discharging water onto said screen to promote the separation of said coarse material from said fine material and for forming a slurry containing said fine material, distributing said relatively coarse material to the upper surface of said bed and distributing said slurry into said bed below the upper surface of said bed.
4. The reactor of claim 3 wherein said second step of distributing comprises pumping said slurry into said bed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US68383584A | 1984-12-19 | 1984-12-19 | |
| US683,835 | 1984-12-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1261683A true CA1261683A (en) | 1989-09-26 |
Family
ID=24745640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000492092A Expired CA1261683A (en) | 1984-12-19 | 1985-10-02 | Coal feed system for a fluidized bed reactor |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS61165506A (en) |
| CN (1) | CN85108257A (en) |
| AU (1) | AU4793885A (en) |
| CA (1) | CA1261683A (en) |
| ES (1) | ES8608921A1 (en) |
| GB (1) | GB2168908B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111550777A (en) * | 2020-06-23 | 2020-08-18 | 杭州和利时自动化有限公司 | Method and system for controlling coal feeding amount of circulating fluidized bed boiler |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10060516A1 (en) * | 2000-12-06 | 2002-06-20 | Mg Technologies Ag | Process for introducing granular ore into a roasting furnace |
| CN1301382C (en) * | 2004-04-06 | 2007-02-21 | 张大伟 | Method for using solid/liquid coal double fuel for circulation fluidized bed boiler |
| CN102102871B (en) * | 2010-11-19 | 2013-05-29 | 株洲市蓝宇热能科技研制有限公司 | Method and device for compositely burning suspended coal dusts and coal water slurry |
| CN103090378A (en) * | 2011-10-27 | 2013-05-08 | 新邵德信绝缘纸板有限公司 | Boiler fire coal processing process |
| DE102012203080A1 (en) * | 2012-02-29 | 2013-08-29 | Siemens Aktiengesellschaft | Fluidized bed reactor |
| CN104832915B (en) * | 2015-01-30 | 2017-05-03 | 武汉凯迪工程技术研究总院有限公司 | Method of blending combustion of fuel coal fly ash in biomass circulating fluidized bed boiler and a device thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1565726A (en) * | 1977-05-06 | 1980-04-23 | Coal Ind | Method of heat treating a material |
| GB2033063B (en) * | 1978-10-31 | 1983-05-25 | Showa Denko Kk | Method for incineration of organic chlorine compound and incinerator used therefor |
| JPS58148307A (en) * | 1982-03-01 | 1983-09-03 | Kawasaki Heavy Ind Ltd | Coal feeder for fluidized bed boiler |
-
1985
- 1985-09-25 AU AU47938/85A patent/AU4793885A/en not_active Abandoned
- 1985-10-02 CA CA000492092A patent/CA1261683A/en not_active Expired
- 1985-10-12 JP JP22602985A patent/JPS61165506A/en active Pending
- 1985-10-17 GB GB08525619A patent/GB2168908B/en not_active Expired
- 1985-10-29 ES ES548320A patent/ES8608921A1/en not_active Expired
- 1985-11-12 CN CN198585108257A patent/CN85108257A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111550777A (en) * | 2020-06-23 | 2020-08-18 | 杭州和利时自动化有限公司 | Method and system for controlling coal feeding amount of circulating fluidized bed boiler |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61165506A (en) | 1986-07-26 |
| GB8525619D0 (en) | 1985-11-20 |
| GB2168908A (en) | 1986-07-02 |
| ES548320A0 (en) | 1986-09-01 |
| ES8608921A1 (en) | 1986-09-01 |
| GB2168908B (en) | 1988-10-19 |
| CN85108257A (en) | 1986-08-20 |
| AU4793885A (en) | 1986-06-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |