CN1011617B - Partial combustion burner with spiral-flow cooled face - Google Patents
Partial combustion burner with spiral-flow cooled faceInfo
- Publication number
- CN1011617B CN1011617B CN 88108098 CN88108098A CN1011617B CN 1011617 B CN1011617 B CN 1011617B CN 88108098 CN88108098 CN 88108098 CN 88108098 A CN88108098 A CN 88108098A CN 1011617 B CN1011617 B CN 1011617B
- Authority
- CN
- China
- Prior art keywords
- burner
- gas
- wall member
- oxygen
- combustion zone
- 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
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
- C10J3/485—Entrained flow gasifiers
- C10J3/487—Swirling or cyclonic gasifiers
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/46—Gasification of granular or pulverulent flues in suspension
- C10J3/48—Apparatus; Plants
- C10J3/50—Fuel charging devices
- C10J3/506—Fuel charging devices for entrained flow gasifiers
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/12—Heating the gasifier
- C10J2300/1223—Heating the gasifier by burners
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
Abstract
A burner for the partial combustion of a solid carbonaceous fuel wherein coal, e.g., finely divided coal, is supplied to a reactor space via a central channel disposed along the longitudinal axis of the burner, and oxygen-containing gas is supplied via at least an annular channel surrounding said central channel, and heat from the combustion is removed from the hollow front face of the burner by coolant flowed through said front face spirally about the longitudinal axis of the burner.
Description
The present invention relates to the burner that the carbonaceous fuel partial combustion is used, especially for solid-fuelled partial combustions in small, broken bits such as coal dusts, fuel is in oxygen-containing gas is sent into the space reactor of operating pressure up to 100 crust, to produce pressure forming gas, fuel gas or reducing gas.
Gasification is also named in the partial combustion of carbon solid fuel, and it is by the generation that reacts of fuel and oxygen.Fuel mainly contains carbon and hydrogen and so on combustible component, and it reacts with the oxygen of input and other steam that may contain and carbon dioxide and generates carbon monoxide and hydrogen.Under certain temperature, also may generate methane.
The solid fuel partial combustion has two kinds of various process basically.First kind of process be emboliform solid combustion in reactor fixed bed or fluid bed, contact with oxygen-containing gas being less than about greatly under 1000 ℃ the temperature.The shortcoming of this method is: the partial combustion by this way of not every solid fuel.For example high expansion coal is just improper, makes reactor that blocked danger be arranged because of the easy slagging scorification of its particle.
A kind of more advanced process is that fuel in small, broken bits is sent in the reactor under higher speed by nitrogen or synthesis gas and so on carrier gas.In reactor, keep flame, fuel and oxygen-containing gas are reacted being higher than under 1000 ℃ the temperature.Carbonaceous fuel is sent in the reactor by burner usually, and oxygen-containing gas also is to send in the reactor by burner.In some technical process, adjustments of gas such as steam or carbon dioxide is also sent in the reactor by burner, this adjustments of gas helps usually slowing down or prevents that oxygen from contacting too early with gas reactor, and contact too early will cause gas reactor to transform undesirablely fully.
Burner of the present invention is suitable for adopting any-mode (mode vertical or level) that reactant is sent in the partial oxidation gas generator conventional, that refractory lining is arranged, be specially adapted to the solid combustion gasification installation of a plurality of reactant burners, burner is located at relative both sides, combustion zone, the levels of reagent direction is sent into, each jet of burner impacts mutually, reduces the ablation to refractory walls to promote part oxidizing process And.
United States Patent (USP) discloses a kind of so a kind of burner that partial combustion is used in the combustion zone for No. 4350103, it comprises a central passage and an outlet of sending fuel to use toward the combustion zone, have one coaxial with this central passage, basically be first circular passage of annular, it has an air supply opening that send oxidant gas toward the combustion zone, at the burner outlet side one centre bore is arranged, have at least fuel and oxidant gas to flow into the combustion zone by this centre bore, one hollow wall member is arranged in the front end outside, be used for fluid coolant is delivered to the carrier pipe of the hithermost initial end of hollow wall member internal channel, be used for the y direction that the return duct that fluid coolant is sent back to nearby by the terminal of this passage makes fluid coolant center on burner is flowed.
Because flame temperature may reach 2000 ℃ or higher, so what this burner at first was concerned about is to prevent that high hot-fluid also relates to the damage to burner surface to the damage of burner front end face in gasification.Overheated in order to prevent the burner front end face, to have advised on the front wall surfaces of burner, adding one deck refractory lining face and a hollow wall member that internal cooling channel is arranged is provided, cooling fluid circulates fast by passage.
Therefore, the purpose of this invention is to provide a kind of burner, cooling fluid is wherein flowed along ad hoc fashion, the front end face that guarantees burner evenly cools off, to reduce thermal stress to greatest extent, because when the burner long-term work, thermal stress can make its damage even damage.
The present invention provides a kind of burner for this reason, uses with oxygen-containing gas partial combustion in the combustion zone for the subdivided solids carbonaceous fuel.It comprises:
A central passage and an outlet of sending fuel to use toward the combustion zone;
At least one is coaxial with this central passage, be first circular passage of annular basically, it has an air supply opening that send oxidant gas toward the combustion zone;
One is positioned at the burner output and perpendicular to the front end face of the burner longitudinal axis, front end face has a centre bore, has at least fuel and oxidant gas to flow into the combustion zone by this centre bore; This front end face has a hollow wall member, and described hollow wall member is connected to: (a) be used for fluid coolant is delivered to the carrier pipe of the hithermost initial end of hollow wall member internal channel; (b) be used for return duct that fluid coolant is sent back to by the terminal of this passage nearby; It is characterized in that having a swirl-flow devices that limits this hollow wall member internal channel, the fluid coolant of sending into the hollow wall member by carrier pipe is flowed along the hand of spiral around the longitudinal axis of burner.
Preferably there is one to be second circular passage, second circular passage and this first circular passage coaxial arrangement of annular basically.And an air supply opening that send second kind of gas in the combustion zone arranged.
Like this, the invention provides a kind of burner, it can long-time running, can make burner front end face and burner other parts not be subjected to too high stress influence.
That for example the present invention is described in detail is as follows referring now to accompanying drawing:
Fig. 1 is the profilograph of burner fore-end of the present invention;
Fig. 2 is the drawing in side sectional elevation of the II-II hatching along Fig. 1;
Fig. 3 is the profilograph of another burner fore-end of the present invention;
Fig. 4 is the drawing in side sectional elevation of the III-III hatching along Fig. 3.
Should be pointed out that identical components all illustrates with same numeral among the figure.
Referring to Fig. 1 and Fig. 2, the burner that the carbonaceous fuel partial combustion of coal dust and so on is used, represent totally that with label 10 it has the central passage 12 and the outlet 16 of sending subdivided solids fuel (arrow A) with the carrier gas of nitrogen, carbon dioxide or forming gas and so on toward the combustion zone that are provided with along the longitudinal axis 14.Around central passage 12 ringwise basically first circular passage 18 of sending oxidizing gas (arrow B) is set with one heart, it has a free end 20 to form an outlet, and oxidizer flow is sent into the combustion zone.The angle of the outlet 20 and the longitudinal axis 14 is preferably about 15 to 60 degree, so that make the oxygen-containing gas air-flow of its ejaculation intersect and mix with the solid fuel stream of being injected by outlet 16 in the combustion zone, downstream.Oxidant gas will be oxygen containing gas, it also can be the gaseous mixture of oxygen-containing gas and a kind of steam or carbon dioxide and so on adjustments of gas, adopt conventional spacer assembly that passage is radially separated each other, for example the mutual symmetry of each passage is separated with alignment pin, spacer, centering blade, partition or other conventional means, and make its stable alignment, make its free flow hinder minimum to reactant.
An advantage of the invention is to make the heat that produces in the burning of burner end face downstream can carry out convection current and radiation conduction, and avoid the cooling fluid in the hollow wall member to seethe with excitement basically or boiling fully.Adopt the high speed cooling fluid can guarantee that by helical duct burner end face temperature is even, metal temperature is low, thereby prolong the life-span of burner.
When adopting water as cooling agent, the discharge of sending in the hollow wall member should be enough big, so that the water temperature rising that enters when the burner maximum heat is exported in the return duct roughly is no more than about 5 ℃, particularly less than about 3 ℃.Preferably adopt temperature to be lower than about 210 ℃ demineralized water as cooling agent.
When said burner 10 makes carbonaceous fuel (for example coal dust) gasification by oxygen-containing gas, be suspended in nitrogen, coal dust in the carrying fluid of forming gas and carbon dioxide and so on is promptly delivered to outlet 16 by central passage 12, so that send in the combustion zone of the reactor that is located at the burner downstream, simultaneously, oxygen-containing gas is delivered to outlet 20 by circular passage 18, coal is thoroughly mixed in space reactor with the oxygen-containing gas reactant, the vorticla motion that baffle plate vortex (not shown) in the respective channel produces one or two strands of jets further promotes reactant to mix, stablize for the output quantity that makes coal, burner central passage 12 is remained unchanged near one section cross section of carrying coal to flow in exits.
When burner operation makes the dusty fuel gasification, adjustment gas such as steam, carbon dioxide or nitrogen can also be sent in the intake pipeline of circular passage, the gaseous mixture of oxygen-containing gas and adjustments of gas is delivered to outlet 20 with the control temperature by circular passage 18, and limit amount of oxygen as required.The dusty fuel flow reaches the flow of the oxygen-containing gas that mixes arbitrarily with adjustment gas and controls with the flow control network (not shown) on the every intake pipeline in burner upstream.The fuel consumption of burner, promptly burner is transferred big fire or is turned fire down, realizes by changing per share jet flow, keeps the ratio of the carbon in oxygen atom and the feeding-in solid body constant substantially simultaneously.The coal of moisture-free per ton and ash content needs 0.9 to 1 ton of oxygen, and this is quite typical to anthracite; 0.7 ton of oxygen of low grade coal needs per ton be have more representational.
Referring to Fig. 3 and Fig. 4, show a kind of burner, being provided with what use for second kind of gas with one heart around its first circular passage 18 is that 22, the second kinds of gases in second circular passage of annular can be the gaseous mixtures of oxygen-containing gas, adjustments of gas (as steam or carbon dioxide) or oxygen-containing gas and adjustments of gas basically.Circular passage 22 has a free end 24 to form the outlet that second kind of gas flows into the combustion zone; this outlet 24 is identical with the angle that the longitudinal axis 14 constitutes usually; but when dealing combustion zone feed adjustment gas or protection gas are used in second circular passage, this outlet is expanded open, promptly degree of shrinkage is less.The sectional area of second circular passage is about 0.5 to 2 divided by the ratio of the first circular passage sectional area, and for example 0.75 to 1.5.
When burner operation made the dusty fuel gasification, second kind of gas was transported to outlet 24 by circular passage 22, so that import supplemental oxygen on demand.Second kind of gas can be the gaseous mixture of oxygen-containing gas, adjustment gas (as steam, carbon dioxide or nitrogen) or oxygen-containing gas and adjustments of gas.When second kind of gas contains a large amount of adjustments of gas, then around coal and oxygen jet, form a screen layer.The adjustments of gas screen layer has to be beneficial to and prevents that oxygen from contacting too early with gas reactor, and contact too early will cause gas reactor to transform undesirablely fully.Preferably carry oxygen-containing gas by two passages, about 35 to 100 meter per seconds of mean flow rate, the gas flow rate of (the inside) circular passage outlet is lower than the gas flow rate of delivering to the combustion zone by the outlet of second circular passage slightly by first.
The flow separately of dusty fuel, oxygen-containing gas and second kind of gas is controlled by the flow control valve on every feed-line of burner.The fuel consumption of burner, promptly burner is transferred big fire or is turned fire down, realizes by changing per share jet flow, keeps the ratio of the carbon in oxygen atom and the feeding-in solid body constant substantially simultaneously.The coal of common moisture-free per ton and ash content needs 0.9 to 1 ton of oxygen, and this is quite typical to anthracite; 0.7 ton of oxygen of low grade coal needs per ton be have more representational.Except the life-span was long, the advantage of burner of the present invention was that it has a passage of carrying second kind of gas toward the combustion zone, and it can carry reactant more neatly under multiple job requirement condition.
Burner is used the exotic material manufacturing usually, particularly with refractory metal and alloy make , And adopt the welding commonly used of this class material and (or) the soldering tech manufacturing.For high-power operation, can be coated with one deck zirconia (ZrO with the oxygen-containing gas passage of metal manufacturing and the inner surface of outlet usually
2) and so on oxide layer or ceramic coating so that can adopt high oxygen-containing gas flow velocity, and do not cause metal by oxygen combustion.
Solid carbonaceous fuel one speech of Shi Yonging means the carbon black that comprises coal, coke, lique faction of coal residue petroleum coke, produced by oil shale and various materials of solids, oil-sand and tar asphalt and so on and composition thereof herein.Coal can be various coals, bag or brown coal, ub-bituminous coal, bituminous coal and anthracite.Solid carbonaceous fuel is preferably worn into fine grained, makes the fuel particle diameter that has weight of accounting for 90% at least less than 90 microns, and water content is approximately less than 5% of weight.
" oxygen-containing gas " speech of Shi Yonging means free oxygen herein, uncombined exactly oxygen And comprises air, oxygen-enriched air (oxygen content is greater than 21% gram molecule) and pure oxygen basically (oxygen content is approximately greater than 95% gram molecule), in above-mentioned gas, also contain other gas that contains usually in the air, as nitrogen and rare gas.
Various remodeling of the present invention is for the people who is familiar with this area, and by understanding in above-mentioned explanation and the accompanying drawing, these are retrofited within the claim scope that all will belong to attached.
Claims (5)
1, solid carbonaceous fuel in small, broken bits comprises with oxygen-containing gas a kind of burner that partial combustion is used in the combustion zone:
A central passage and an outlet of sending fuel to use toward the combustion zone;
At least one is coaxial with this central passage, be first circular passage of annular basically, it has an air supply opening that send oxidant gas toward the combustion zone;
One is positioned at the burner outlet side and perpendicular to the front end face of the burner longitudinal axis, front end face has a centre bore, has at least fuel and oxidant gas to flow into the combustion zone by this centre bore; This front end face has a hollow wall member, and described hollow wall member is connected to: (a) be used for fluid coolant is delivered to the carrier pipe of the hithermost initial end of hollow wall member internal channel; (b) be used for return duct that fluid coolant is sent back to by the terminal of this passage nearby; It is characterized in that having a swirl-flow devices that limits this hollow wall member internal channel, the fluid coolant of sending into the hollow wall member by carrier pipe is flowed along the hand of spiral around the longitudinal axis of burner.
2, according to the burner of claim 1, it is characterized in that it has one to be second circular passage of annular basically, second circular passage and this first circular passage coaxial arrangement And have an air supply opening that send second kind of gas in the combustion zone, and second kind of gas flows into the combustion zone by the centre bore on the burner front end face.
3,, it is characterized in that this swirl-flow devices has continuous, impervious screen layer, so that in the hollow wall member, form a helical duct according to the burner of claim 1 or 2.
4,, it is characterized in that the channel end of the cooling fluid of this hollow wall member is located near this central hole according to the burner of claim 1 or 2.
5, according to the burner of claim 2, it is characterized in that first circular passage and second circular passage are connected to the oxygen-containing gas source of the gas respectively, can carry out pressure and flow-control separately.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US156.679 | 1988-02-17 | ||
US156.675 | 1988-02-17 | ||
US07/156,675 US4887962A (en) | 1988-02-17 | 1988-02-17 | Partial combustion burner with spiral-flow cooled face |
US07/156,679 US4865542A (en) | 1988-02-17 | 1988-02-17 | Partial combustion burner with spiral-flow cooled face |
Publications (2)
Publication Number | Publication Date |
---|---|
CN1035172A CN1035172A (en) | 1989-08-30 |
CN1011617B true CN1011617B (en) | 1991-02-13 |
Family
ID=26853407
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN 88108098 Expired CN1011617B (en) | 1988-02-17 | 1988-11-30 | Partial combustion burner with spiral-flow cooled face |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0328794B1 (en) |
JP (1) | JP2627552B2 (en) |
CN (1) | CN1011617B (en) |
AU (1) | AU605388B2 (en) |
CA (1) | CA1308306C (en) |
DE (1) | DE3862757D1 (en) |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN201228965Y (en) | 2007-08-06 | 2009-04-29 | 国际壳牌研究有限公司 | Combustor |
CN101363623B (en) * | 2007-08-06 | 2010-12-08 | 国际壳牌研究有限公司 | Burner |
CN101363626B (en) * | 2007-08-06 | 2015-05-20 | 国际壳牌研究有限公司 | Method of manufacturing a burner front face |
US8070483B2 (en) * | 2007-11-28 | 2011-12-06 | Shell Oil Company | Burner with atomizer |
CN101909738B (en) | 2008-01-16 | 2013-11-06 | 国际壳牌研究有限公司 | Process to provide a particulate solid material to a pressurised reactor |
SE532338C2 (en) | 2008-04-22 | 2009-12-15 | Aga Ab | Method and apparatus for combustion of solid phase fuel |
CN101382292B (en) * | 2008-10-24 | 2010-09-01 | 孙明路 | Alcohol based burning machine, alcohol based combustion nozzle thereof and pneumatic power shearing knife |
CN103140713A (en) * | 2010-09-16 | 2013-06-05 | 勒舍有限公司 | Solid-fuel-fired hot gas generator having an extended control range |
KR101892683B1 (en) | 2010-10-01 | 2018-08-29 | 에어 프로덕츠 앤드 케미칼스, 인코오포레이티드 | A burner for the gasification of a solid fuel |
US9822969B2 (en) | 2010-11-30 | 2017-11-21 | General Electric Company | Fuel injector having tip cooling |
CN102287825A (en) * | 2011-07-15 | 2011-12-21 | 马鞍山科达洁能股份有限公司 | Burning nozzle and coal-gasifying furnace |
WO2013010303A1 (en) * | 2011-07-15 | 2013-01-24 | 马鞍山科达洁能股份有限公司 | Burner nozzle and coal gasifier |
CN102287826B (en) * | 2011-07-15 | 2013-09-11 | 安徽科达洁能股份有限公司 | Combustion nozzle and coal gasification furnace |
CN103254940A (en) * | 2012-02-16 | 2013-08-21 | 通用电气公司 | A system and a method for cooling a fuel injector |
CN202835334U (en) | 2012-04-02 | 2013-03-27 | 国际壳牌研究有限公司 | Burner used for gasified solid fuel |
CN103266951A (en) * | 2012-05-22 | 2013-08-28 | 摩尔动力(北京)技术股份有限公司 | Non-gas-liquid fuel working medium generator for power system |
EP2743579A1 (en) * | 2012-12-14 | 2014-06-18 | Siemens Aktiengesellschaft | Burner tip and burner |
CN107033971B (en) * | 2016-02-04 | 2021-01-08 | 清华大学 | Multi-channel combined burner for coal water slurry gasification furnace and coal water slurry gasification furnace |
CN107022379B (en) * | 2017-05-09 | 2020-05-26 | 哈尔滨工业大学 | Dry coal powder entrained flow gasifier nozzle with water-cooling coil protection |
CN110577846B (en) * | 2019-09-12 | 2021-02-05 | 杨建平 | Combustion system and burner |
TWI769612B (en) * | 2020-11-02 | 2022-07-01 | 國立成功大學 | Scroll heating device |
CN112797420A (en) * | 2020-12-07 | 2021-05-14 | 南京锦泥资源环境科技有限公司 | Waste water mud minimizing is with burning device |
CN112879902A (en) * | 2021-01-18 | 2021-06-01 | 煤科院节能技术有限公司 | Biomass powder coupled pulverized coal burner and using method thereof |
CN112856439A (en) * | 2021-01-18 | 2021-05-28 | 煤科院节能技术有限公司 | Combustion processor and method for treating refuse incineration ash |
CN112856438A (en) * | 2021-01-18 | 2021-05-28 | 煤科院节能技术有限公司 | Organic waste liquid combustion processor and use method thereof |
CN112856454A (en) * | 2021-01-18 | 2021-05-28 | 煤科院节能技术有限公司 | Exhaust gas treatment device and exhaust gas treatment method |
CN114621793B (en) * | 2022-03-17 | 2023-06-13 | 张金辉 | Burner of coal gasification equipment |
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Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3607157A (en) * | 1969-07-23 | 1971-09-21 | Texaco Inc | Synthesis gas from petroleum coke |
US4443228A (en) * | 1982-06-29 | 1984-04-17 | Texaco Inc. | Partial oxidation burner |
US4547145A (en) * | 1983-03-09 | 1985-10-15 | Texaco Development Corporation | Combination with a high temperature combustion chamber and top burner |
US4443230A (en) * | 1983-05-31 | 1984-04-17 | Texaco Inc. | Partial oxidation process for slurries of solid fuel |
GB8317251D0 (en) * | 1983-06-24 | 1983-07-27 | Shell Int Research | Burner for gasification of solid fuel |
DE3440088A1 (en) * | 1984-11-02 | 1986-05-07 | Veba Oel Entwicklungs-Gesellschaft mbH, 4650 Gelsenkirchen | BURNER |
IN167217B (en) * | 1985-04-16 | 1990-09-22 | Dow Chemical Co |
-
1988
- 1988-11-29 JP JP29977288A patent/JP2627552B2/en not_active Expired - Lifetime
- 1988-11-29 AU AU26373/88A patent/AU605388B2/en not_active Expired
- 1988-11-30 CN CN 88108098 patent/CN1011617B/en not_active Expired
- 1988-12-06 DE DE8888202798T patent/DE3862757D1/en not_active Expired - Lifetime
- 1988-12-06 EP EP19880202798 patent/EP0328794B1/en not_active Expired
- 1988-12-06 CA CA000585081A patent/CA1308306C/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH028603A (en) | 1990-01-12 |
EP0328794B1 (en) | 1991-05-08 |
AU2637388A (en) | 1989-08-17 |
CN1035172A (en) | 1989-08-30 |
CA1308306C (en) | 1992-10-06 |
JP2627552B2 (en) | 1997-07-09 |
EP0328794A1 (en) | 1989-08-23 |
DE3862757D1 (en) | 1991-06-13 |
AU605388B2 (en) | 1991-01-10 |
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