EP0346615B1 - Apparatus for blowing preheated air into a shaft furnace - Google Patents
Apparatus for blowing preheated air into a shaft furnace Download PDFInfo
- Publication number
- EP0346615B1 EP0346615B1 EP89108668A EP89108668A EP0346615B1 EP 0346615 B1 EP0346615 B1 EP 0346615B1 EP 89108668 A EP89108668 A EP 89108668A EP 89108668 A EP89108668 A EP 89108668A EP 0346615 B1 EP0346615 B1 EP 0346615B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coils
- preheated air
- air
- cooling
- furnace
- 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
Links
- 238000007664 blowing Methods 0.000 title claims 2
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000000969 carrier Substances 0.000 description 11
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 241000270295 Serpentes Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000012809 cooling fluid Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/16—Tuyéres
- C21B7/163—Blowpipe assembly
Definitions
- the present invention relates to a device for injecting preheated air into a shaft furnace, composed of several tubular elements provided with an internal refractory lining and connected, on one side, by an elbow, a nozzle and a nozzle to the wall of the furnace and, on the other side, to a main circular duct arranged around the furnace and supplied with preheated air by an installation comprising a blower, several cowpers and a mixing chamber.
- wind-carrier A device of this kind, more generally known under the name of "wind-carrier” is known from US Pat. No. 3,766,868.
- These wind-carriers are arranged, in a relatively large number, around the base of an oven, for example d '' a blast furnace, with a view to injecting hot air into it to maintain the combustion and reduction process in the furnace.
- the air is injected at a temperature of the order of 1200 ° C. or more and the heating to this temperature is carried out in air heaters commonly called “cowpers”.
- these must have a thick refractory lining on the one hand, to avoid heat loss and, on the other hand, to protect the metal shielding. outside against thermal radiation and high air temperature.
- the high thickness of this refractory lining adversely affects the manufacturing price of the wind carriers, and further increases the weight and size thereof.
- a more advantageous alternative has so far not been possible.
- the object of the present invention is to provide a new wind carrier whose refractory lining, with at least equal performance, is thinner than those of known wind carriers.
- the invention provides a device of the type described in the preamble which is essentially characterized by cooling coils embedded in the mass of the refractory lining and supplied with cooling air circulating through the coils in the same direction as the preheated air, the outlet of the coils opening into the internal channel conveying the preheated air.
- These coils extend, preferably, from the region of the circular conduit to the nozzle.
- These coils which may consist of copper pipes, are preferably divided into several independent sections, each opening into the internal channel.
- the device comprises means allowing the cooling air circulating in the coils to be at least part of the cold air sent by the blower into the mixing chamber for adjusting the the temperature of the preheated air.
- the cold air which was previously sent into the mixing chamber for adjusting the temperature of the preheated air in the cowpers is, in the device according to the present invention, mixed, at least partially, with the preheated air inside the wind carriers to provide the same temperature control effect. There is therefore no need to provide an additional fan to supply the cooling coils of the wind carrier according to the present invention.
- FIG. 1 shows a schematic vertical section through a wind carrier according to the present invention
- FIG. 2 represents a block diagram illustrating the feeding of the cooling snakes of the wind carrier.
- the wind carrier shown in Figure 1 comprises a straight tubular element 10 whose upper end is articulated on a tube 12 which is clamped on the circular pipe not shown and whose lower end is articulated on a tube 14 which is clamped on the upper end of a bend 16 whose opposite end is fixed to a nozzle 18.
- the tip of this nozzle 18 communicates by a ball joint with a nozzle by which the preheated air is injected into the oven not shown .
- the joints on either side of the pipe 10 can be produced, in a manner known per se, by cardan couplings 22, 24, associated with bellows compensators 26, 28 to ensure sealing.
- All the elements of the blower have an interior refractory coating 30 which is applied to the interior surface of an exterior metal shielding 32. It is therefore this refractory coating 30 which defines the channel 34 through which the preheated air passes through the door. -wind.
- This refractory lining 30 has the dual function of avoiding heat losses from the preheated air passing through the channel 34 and of protecting the metal shield 32 against excessive temperatures.
- cooling of the refractory lining 30 is provided by means of coils 36 which are embedded in the mass of the lining 30 in the immediate vicinity of the shielding 32.
- the protection and insulation function of the shielding 32 ensured in the wind carriers known by the refractory lining is therefore, at least in part, provided in the device according to the present invention by the coils 36, so that the thickness of the refractory lining 30 can be considerably reduced since the insulation formed by the streamers is regenerated into permanently thanks to air circulation.
- the coils 36 can be made of copper tubes with an internal diameter of 1 to 2 cm.
- the cooling circuit is preferably made up of several independent sections, in this case three sections, the first section 36a operating in the straight section of the wind carrier, the second section 36b operating in the elbow and the third section 36c evolving in the nozzle 18.
- Each of the cooling sections 36a, 36b, 36c has an inlet E and an outlet S for the cooling fluid which therefore circulates in the direction of propagation of the preheated air through the channel 34.
- cold air from the installation for producing preheated air is used as cooling agent, this cooling air being mixed, in the wind carrier, with the preheated air to adjust the temperature. This is the reason why all the outputs S of the three cooling sections are directed into channel 34.
- the supply of the three cooling circuits of a blower 40 is schematically illustrated in FIG. 2.
- the references 42 and 44 designate a battery of cowpers in which the cold air coming from a blower 46 is heated, in a manner known per se, at the required temperature.
- the concept "cold air” is entirely relative since the "cold” air already has a temperature of the order of 100 ° C., as a result of heating in the blower 46. Being given that the air is injected into the oven at a well-determined temperature, as constant as possible, of the order of 1200 degrees, the preheated air leaving the cowpers 42 and 44 must be at a higher temperature.
- the present invention proposes to use at least part of the cold air intended for the mixing chamber 48 to supply the cooling circuits of the blower 40.
- the three cooling circuits are therefore connected through conduits 56a, 56b , 56c to the cold air line entering the mixing chamber 48 between the latter and the automatic valve 50.
- the temperature of the preheated air is regulated by the controlled addition of cold air. in the mixing chamber 48 and partly inside the wind carriers 40. Consequently, the cooling of the wind carriers 40 does not disturb the temperature of the preheated air and does not require additional blowers.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Furnace Details (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
La présente invention concerne un dipositif d'injection d'air préchauffé dans un four à cuve, composé de plusieurs éléments tubulaires garnis d'un revêtement réfractaire intérieur et reliés, d'un côté, par un coude, un busillon et une tuyère à la paroi du four et, de l'autre côté, à une conduite circulaire principale disposée autour du four et alimentée en air préchauffé par une installation comprenant une soufflante, plusieurs cowpers et une chambre de mélange.The present invention relates to a device for injecting preheated air into a shaft furnace, composed of several tubular elements provided with an internal refractory lining and connected, on one side, by an elbow, a nozzle and a nozzle to the wall of the furnace and, on the other side, to a main circular duct arranged around the furnace and supplied with preheated air by an installation comprising a blower, several cowpers and a mixing chamber.
Un dispositif de ce genre, plus généralement connu sous le nom de "porte- vent" est connu du brevet US 3766868. Ces porte-vents sont disposés, en un nombre relativement élevé, autour de la base d'un four, par exemple d'un haut fourneau, en vu d'y injecter de l'air chaud pour l'entretien du processus de combustion et de réduction dans le four. A cet effet, l'air est injecté à une température de l'ordre de 1200°C ou plus et le réchauffement à cette température est réalisé dans des réchauffeurs d'air couramment appelés "cowpers". Compte-tenu de cette température élevée de l'air traversant les porte-vents, ceux-ci doivent comporter un épais revêtement réfractaire intérieur, d'une part, pour éviter les déperditions thermiques et, d'autre part, pour protéger le blindage métallique extérieur contre les rayonnements thermiques et la température élevée de l'air. Malheureusement, l'épaisseur élevée de ce revêtement réfractaire influence défavorablement le prix de fabrication des porte-vents, et augmente, en outre, le poids et l'encombrement de ceux-ci. Malgré certaines tentatives, une alternative plus avantageuse n'a pu être réalisée jusqu'à présent.A device of this kind, more generally known under the name of "wind-carrier" is known from US Pat. No. 3,766,868. These wind-carriers are arranged, in a relatively large number, around the base of an oven, for example d '' a blast furnace, with a view to injecting hot air into it to maintain the combustion and reduction process in the furnace. To this end, the air is injected at a temperature of the order of 1200 ° C. or more and the heating to this temperature is carried out in air heaters commonly called "cowpers". Given this high temperature of the air passing through the wind carriers, these must have a thick refractory lining on the one hand, to avoid heat loss and, on the other hand, to protect the metal shielding. outside against thermal radiation and high air temperature. Unfortunately, the high thickness of this refractory lining adversely affects the manufacturing price of the wind carriers, and further increases the weight and size thereof. Despite some attempts, a more advantageous alternative has so far not been possible.
Le but de la présente invention est de prévoir un nouveau porte-vent dont le revêtement réfractaire, à performance au moins égale, est moins épais que ceux des porte-vents connus.The object of the present invention is to provide a new wind carrier whose refractory lining, with at least equal performance, is thinner than those of known wind carriers.
Pour atteindre cet objectif, l'invention propose un dispositif du genre décrit dans le préambule qui est essentiellement caractérisé par des serpentins de refroidissement noyés dans la masse du revêtement réfractaire et alimentés en air de refroidissement circulant à travers les serpentins dans le même sens que l'air préchauffé, la sortie des serpentins débouchant dans le canal intérieur véhiculant l'air préchauffé.To achieve this objective, the invention provides a device of the type described in the preamble which is essentially characterized by cooling coils embedded in the mass of the refractory lining and supplied with cooling air circulating through the coils in the same direction as the preheated air, the outlet of the coils opening into the internal channel conveying the preheated air.
Ces serpentins s'étendent, de préférence, de la région de la conduite circulaire jusque dans le busillon.These coils extend, preferably, from the region of the circular conduit to the nozzle.
Ces serpentins, qui peuvent être constitués par des tuyaux en cuivre, sont de préférence divisés en plusieurs sections indépendantes débouchant chacune dans le canal intérieur.These coils, which may consist of copper pipes, are preferably divided into several independent sections, each opening into the internal channel.
Selon un autre aspect de l'invention, le dispositif comporte des moyens permettant à l'air de refroidissement circulant dans les serpentins d'être au moins une partie de l'air froid envoyé par la soufflante dans la chambre de mélange pour le réglage de la température de l'air préchauffé. Autrement dit, l'air froid qui, auparavant, était envoyé dans la chambre de mélange pour le réglage de la température de l'air préchauffé dans les cowpers est, dans le dispositif selon la présente invention, mélangé, au moins partiellement, avec l'air préchauffé à l'intérieur des porte-vents pour assurer le même effet de réglage de la température. Il n'y a donc pas de nécessité de prévoir une soufflante supplémentaire pour alimenter les serpentins de refroidissement du porte-vent selon la présente invention.According to another aspect of the invention, the device comprises means allowing the cooling air circulating in the coils to be at least part of the cold air sent by the blower into the mixing chamber for adjusting the the temperature of the preheated air. In other words, the cold air which was previously sent into the mixing chamber for adjusting the temperature of the preheated air in the cowpers is, in the device according to the present invention, mixed, at least partially, with the preheated air inside the wind carriers to provide the same temperature control effect. There is therefore no need to provide an additional fan to supply the cooling coils of the wind carrier according to the present invention.
D'autres particularités et caractéristiques ressortiront de la description d'un mode de réalisation avantageux présenté ci-dessous, à titre d'illustration, en référence aux dessins annexés dans lesquels la figure 1 montre une coupe verticale schématique à travers un porte-vent selon la présente invention et
la figure 2 représente un schéma en blocs illustrant l'alimentation des serpents de refroidissement du porte-vent.Other particularities and characteristics will emerge from the description of an advantageous embodiment presented below, by way of illustration, with reference to the appended drawings in which FIG. 1 shows a schematic vertical section through a wind carrier according to the present invention and
FIG. 2 represents a block diagram illustrating the feeding of the cooling snakes of the wind carrier.
Le porte-vent représenté sur la figure 1 comporte un élément tubulaire rectiligne 10 dont l'extrémité supérieure est articulée sur une tubulure 12 qui est bridée sur la conduite circulaire non représentée et dont l'extrémité inférieure est articulée sur une tubulure 14 qui est bridée sur l'extrémité supérieure d'un coude 16 dont l'extrémité opposée est fixée à un busillon 18. La pointe de ce busillon 18 communique par un joint à rotule avec une tuyère par laquelle l'air préchauffé est injecté dans le four non représenté. Les articulations de part et d'autre de la tubulure 10 peuvent être réalisées, de façon connue en soi, par des accouplements à cardan 22,24, associés à des compensateurs à soufflet 26,28 pour assurer l'étanchéité.The wind carrier shown in Figure 1 comprises a straight
Tous les éléments du porte-vent comportent un revêtement réfractaire intérieur 30 qui est appliqué sur la surface intérieure d'un blindage métallique extérieur 32. C'est donc ce revêtement réfractaire 30 qui définit le canal 34 par lequel l'air préchauffé traverse le porte-vent. Ce revêtement réfractaire 30 a la double fonction d'éviter les pertes thermiques de l'air préchauffé traversant le canal 34 et de protéger le blindage métallique 32 contre les températures excessives.All the elements of the blower have an interior
Conformément à la présente invention on a prévu un refroidissement du revêtement réfractaire 30 à l'aide de serpentins 36 qui sont noyés dans la masse du revêtement 30 à proximité immédiate du blindage 32. La fonction de protection et d'isolation du blindage 32 assurée dans les porte-vents connus par le revêtement réfractaire est donc, au moins en partie, assurée dans le dispositif selon la présente invention par les serpentins 36, de sorte que l'épaisseur du revêtement réfractaire 30 peut être considérablement réduite car l'isolation formée par les serpentins est régénérée en permanence grâce à la circulation de l'air.In accordance with the present invention, cooling of the
Les serpentins 36 peuvent être constitués de tubes en cuivre d'un diamètre intérieur de 1 à 2 cm.The
Pour assurer un refroidissement efficace, le circuit de refroidissement est de préférence constitué de plusieurs sections indépendantes, en l'occurence de trois sections, la première section 36a évoluant dans la section rectiligne du porte-vent, la seconde section 36b évoluant dans le coude et la troisième section 36c évoluant dans le busillon 18. Chaucune des sections de refroidissement 36a, 36b, 36c comporte une entrée E et une sortie S pour le fluide de refroidissement qui circule donc dans le sens de propagation de l'air préchauffé à travers le canal 34. Selon un mode de réalisaiton avantageux, on utilise, comme agent de refroidissement, de l'air froid en provenance de l'installation de production d'air préchauffé, cet air de refroidissement étant mélangé, dans le porte-vent, à l'air préchauffé afin d'en régler la température. C'est la raison pour laquelle toutes les sorties S des trois sections de refroidissement sont dirigées dans le canal 34.To ensure effective cooling, the cooling circuit is preferably made up of several independent sections, in this case three sections, the
L'alimentation des trois circuits de refroidissement d'un porte-vent 40 est schématiquement illustrée sur la figure 2. Les références 42 et 44 désignent une batterie de cowpers dans lesquels l'air froid en provenance d'une soufflante 46 est chauffé, de façon connue en soi, à la température requise. Il est à noter que la notion "air froid" est tout à fait relative étant donné que l'air "froid" possède déjà une température de l'ordre de 100°C , par suite d'un réchauffement dans la soufflante 46. Etant donné que l'air est injecté dans le four à une température bien déterminée, aussi constante que possible, de l'ordre de 1200 degré, l'air préchauffé quittant les cowpers 42 et 44 doivent être à une température supérieure. En outre, il n'est pas possible de produire dans les cowpers 42, 44 de l'air à une température constante et on s'arrange donc pour produire dans les cowpers de l'air à une température supérieure afin d'en régulariser la température à la valeur requise par un mélange contrôlé avec de l'air froid dans une station de mélange 48. Cet air froid est envoyé dans la station de mélange 48 directement par la soufflante 46 sous le contrôle d'une vanne automatique 50 qui règle le débit de l'air en fonction de la température de l'air préchauffé pénétrant dans la station de mélange 48. L'air préchauffé est alors envoyé de la station de mélange 48 à température constante à travers une conduite 52 vers la conduite circulaire 54 alimentant les porte-vents 40.The supply of the three cooling circuits of a
La présente invention propose d'utiliser au moins une partie de l'air froid destiné à la chambre de mélange 48 pour alimenter les circuits de refroidissement du porte-vent 40. Les trois circuits de refroidissement sont donc branchés à travers des conduites 56a, 56b, 56c à la conduite d'air froid pénétrant dans la chambre de mélange 48 entre celle-ci et la vanne automatique 50. Autrement dit, le réglage de la température de l'air préchauffé par addition contrôlée d'air froid se fait en partie dans la chambre de mélange 48 et en partie à l'intérieur des porte-vents 40. Par conséquent, le refroidissement des porte-vents 40 ne perturbe pas la température de l'air préchauffé et ne nécessite pas de soufflantes supplémentaires. On pourrait même imaginer la possibilité d'une suppression complète de l'admission d'air froid à la chambre de mélange 48 pour envoyer la totalité de l'air froid de réglage de la température de l'air préchauffé dans les circuits de refroidissement des porte-vents 40 et réaliser ainsi complètement le réglage de la température à l'intérieur des porte-vents.The present invention proposes to use at least part of the cold air intended for the
Claims (5)
- Device for blowing preheated air into a shaft furnace consisting of several tubular components provided with an internal refractory lining (30) and connected at one end to the wall of the furnace by an elbow pipe (16), blow pipe (18) and tuyere (20) and at the other end to a main bustle pipe disposed around the furnace and supplied with preheated air by an installation comprising a blower (46), several cowper stoves (42), (44) and a mixing chamber (48), characterised by cooling coils (36) embedded in the body of the refractory lining (30) and supplied with cooling air circulating through the coils (36) in the same direction as the preheated air and in that the outlet (S) from the coils opens into the inner duct (34) conveying the preheated air.
- Device according to Claim 1, characterised in that the coils (36) extend from the region of the bustle pipe into the blow pipe (18).
- Device according to one of Claims 1 or 2, characterised in that the coils (36) consist of several independent sections (36a), (36b), (36c) each opening into the inner duct (34).
- Device according to any one of Claims 1 to 3, characterised in that the coils (36) are formed from copper pipes.
- Device according to any one of Claims 1 to 4, characterised in that it includes means enabling the cooling air circulating in the coils (36) to be at least a proportion of the cold air sent by the blower (46) into the mixing chamber (48) for regulating the temperature of the preheated air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT89108668T ATE87980T1 (en) | 1988-06-13 | 1989-05-13 | DEVICE FOR BLOWING PREHEATED AIR INTO A TUBE FURNACE. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU87240A LU87240A1 (en) | 1988-06-13 | 1988-06-13 | DEVICE FOR INJECTING PREHEATED AIR IN A TANK OVEN |
| LU87240 | 1988-06-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0346615A1 EP0346615A1 (en) | 1989-12-20 |
| EP0346615B1 true EP0346615B1 (en) | 1993-04-07 |
Family
ID=19731059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89108668A Expired - Lifetime EP0346615B1 (en) | 1988-06-13 | 1989-05-13 | Apparatus for blowing preheated air into a shaft furnace |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0346615B1 (en) |
| AT (1) | ATE87980T1 (en) |
| AU (1) | AU608710B2 (en) |
| CA (1) | CA1317157C (en) |
| DE (1) | DE68905862T2 (en) |
| LU (1) | LU87240A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102914144A (en) * | 2011-08-01 | 2013-02-06 | Sab有限公司 | Blower nozzle elbow |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE546593C (en) * | 1932-03-16 | Hundt & Weber Vormals Metallwe | Device for cooling blast furnace molds using compressed air | |
| FR2101124A7 (en) * | 1970-08-25 | 1972-03-31 | Floch Jean Le | Blast furnace tuyere - which can be dismantled by manipulator and has efficient cooling system |
| US3766868A (en) * | 1972-02-22 | 1973-10-23 | Anciens Etablissements P Warth | Tuyere stock for furnaces |
| AU474212B2 (en) * | 1973-02-14 | 1974-08-15 | Kurimoto Ironworks, Ltd | A tuyere fora meeting furnace |
| AU477764B2 (en) * | 1974-03-05 | 1975-09-11 | Metallurgichesky Etc | Blast-furnace tuyere |
-
1988
- 1988-06-13 LU LU87240A patent/LU87240A1/en unknown
-
1989
- 1989-05-13 EP EP89108668A patent/EP0346615B1/en not_active Expired - Lifetime
- 1989-05-13 DE DE8989108668T patent/DE68905862T2/en not_active Expired - Fee Related
- 1989-05-13 AT AT89108668T patent/ATE87980T1/en not_active IP Right Cessation
- 1989-05-26 AU AU35223/89A patent/AU608710B2/en not_active Ceased
- 1989-05-29 CA CA000601074A patent/CA1317157C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102914144A (en) * | 2011-08-01 | 2013-02-06 | Sab有限公司 | Blower nozzle elbow |
| CN102914144B (en) * | 2011-08-01 | 2016-04-27 | Sab有限公司 | Blower nozzle elbow |
Also Published As
| Publication number | Publication date |
|---|---|
| LU87240A1 (en) | 1990-02-28 |
| DE68905862T2 (en) | 1993-07-15 |
| DE68905862D1 (en) | 1993-05-13 |
| ATE87980T1 (en) | 1993-04-15 |
| EP0346615A1 (en) | 1989-12-20 |
| AU3522389A (en) | 1989-12-14 |
| AU608710B2 (en) | 1991-04-11 |
| CA1317157C (en) | 1993-05-04 |
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