EP0022549A1 - Process and apparatus for the injection of solid fuel into a shaft furnace - Google Patents
Process and apparatus for the injection of solid fuel into a shaft furnace Download PDFInfo
- Publication number
- EP0022549A1 EP0022549A1 EP80103904A EP80103904A EP0022549A1 EP 0022549 A1 EP0022549 A1 EP 0022549A1 EP 80103904 A EP80103904 A EP 80103904A EP 80103904 A EP80103904 A EP 80103904A EP 0022549 A1 EP0022549 A1 EP 0022549A1
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- Prior art keywords
- nozzles
- hot wind
- air
- blower
- wind
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- 239000004449 solid propellant Substances 0.000 title claims abstract description 22
- 238000002347 injection Methods 0.000 title claims description 17
- 239000007924 injection Substances 0.000 title claims description 17
- 238000000034 method Methods 0.000 title claims description 10
- 238000009434 installation Methods 0.000 claims description 17
- 239000000446 fuel Substances 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000000969 carrier Substances 0.000 claims description 5
- 230000001413 cellular effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 239000003245 coal Substances 0.000 abstract description 3
- 239000003077 lignite Substances 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000003209 petroleum derivative Substances 0.000 description 2
- 238000011946 reduction process Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 241001669679 Eleotris Species 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 208000016253 exhaustion Diseases 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
Definitions
- the present invention relates to a process for injecting solid fuels into a shaft furnace, in particular into a blast furnace, as well as an installation for carrying out this process.
- a blast furnace is generally provided with a circular duct connected to the base of the furnace by a lining of wind carrier and hot wind injection nozzles which is produced in an installation comprising a blower, a battery of cowpers and a station of mixture having two inlets connected respectively to the blower and to each of the cowpers and an outlet supplying the circular pipe with hot wind at a constant and regulated temperature.
- the hot wind is generally enriched by means of a fuel which is injected into this hot wind at the level of the nozzles.
- liquid fuels and more particularly petroleum products, have been used, so to speak. Indeed, these liquid fuels have the advantage of being very easy to handle and the means used for their injection into the nozzles are simple, inexpensive and practically do not disturb the operation of other organs or installations, in particular the temperature of the hot wind into which they are injected.
- the pneumatic route is used for injecting liquid fuels into ovens, relatively large quantities of propulsion fluids, which is generally air, must be considered.
- the temperature of the propelling air cannot exceed 80 to 120 ° C. In other words, not only is there a risk of nullifying the effect of the mixing station by again disturbing the temperature of the hot wind by means of the propelling air, but also it will be necessary, or else increase the power of the cowpers to compensate this loss of temperature, or else be satisfied with a lower operating temperature of the hot wind.
- the objective of the present invention is to provide a new method for injecting solid fuels into a shaft furnace which makes it possible to avoid the abovementioned drawbacks, that is to say not to influence the parameters d injection of hot wind.
- a complementary objective of the invention is the production of an installation for the implementation of this process.
- the installation for implementing this method is essentially characterized by a circuit parallel to the supply circuit of the circular pipe in hot wind, connected between a point located in the cold air supply pipe of the mixing station. on the one hand and each of the nozzles on the other hand and comprising a compressor and at least one solid fuel intake device.
- the fuel intake device preferably consists of a series of airlock airlocks, the number of which can be equal to half the number of nozzles so that an airlock is associated with a pair of nozzles.
- FIG. 1 schematically shows a blast furnace 2 provided with a circular pipe 4 for supplying hot wind.
- This circular pipe 4 is connected to the base of the furnace by means of a series of air carriers 6 connected to nozzles not shown embedded in the wall of the furnace.
- the hot wind for supplying the circular pipe 4 and the wind carriers 6 is produced in an installation 8 essentially comprising a battery of cowpers 12, 14 well known per se.
- cowpers are, in fact, ovens intended to heat the cold air coming from a blower 10 to a temperature higher than that of the hot wind injected into the oven.
- the operation of such a cowper comprises two phases, namely a phase of heating and storage of heat and a phase of removal of the stored heat and warming of the cold air. Therefore, to ensure continuous operation, at least one pair of alternating cowpers is required.
- the designation "cold" of the air sent by the blower 10 into the cowpers 12 and 14 is not significant, since the temperature of this "cold” air is approximately 100 to 120 ° C due to the heating in the blower 10.
- the temperature of the hot air leaving the cowpers depends on the thermal requirements for injection into the oven. When the hot air injected into the furnace must have a temperature of approximately 1200 ° C., the heating produced in the cowpers 12, 14 must rise to approximately 1300 ° C. to compensate for the heat losses and to be able to ensure a constant temperature in a mixing station 16.
- this mixing station 16 The purpose of this mixing station 16 is to ensure a constant temperature of the hot wind for injection into the oven. Indeed, it is not possible to have a constant and uniform temperature at the exit of the cowpers where there are always fluctuations of a few tens of degrees. This is the reason why it is necessary to heat the hot wind in the cowpers to a sufficient temperature in order to be able to reduce it to a uniform temperature in the mixing station 16 by admitting a metered amount of cold wind through a con line 18 connected to the blower 10. The necessary quantity of cold air admitted into the mixing station 16 through the line 18 is adjusted automatically by means of an automatic valve 20 which regulates the flow of cold air as a function of the temperature of the hot wind in the circular pipe. In this way, it is ensured that the temperature of the hot wind injected into the oven remains constant.
- This installation 8 for producing hot wind as shown in the figure constitutes a conventional installation well known per se.
- a parallel circuit 22 is grafted onto this installation 8 for the pneumatic injection of solid fuels into each of the furnace nozzles.
- a pipe 24 connected to the cold air intake pipe of the mixing station 16 between the latter and the valve 20 and intended to extract the quantity of air necessary for the pneumatic propulsion of the solid fuel. The adjustment of the amount of propelled air deflected in line 24 is automatically adjusted by a valve 26 as required.
- a compressor 28 intended to raise the pressure of the propelling air in circuit 22 so as to compensate for the pressure losses and ensure injection into the furnace.
- the pressure difference DP produced in the compressor 28 is generally 2 bars, counting approximately 1 bar for the compensation of the pressure drops and a reserve of one bar for the injection. Consequently, if the pressure of the hot wind to be injected into the furnace is approximately 2.5 bars, the pressure of the propelling air downstream from the compressors 28 is approximately 4.5 bars.
- the admission of solid fuel, in powder or powder form into the circuit 22 is carried out using a blast airlock with a cellular rotor 30 well known per se.
- This solid fuel which can be lignite powder or coal powder, is then propelled through line 32 in the furnace nozzles.
- the propulsion air undergoes heating in the compressor 28.
- a cooling device 33 In order to prevent the temperature of the propelling air from reaching the self-ignition threshold of the solid fuel and, also, to reduce the temperature at a value approximately equal to the temperature at the place of drawing off the propelling air, that is to say between the valve 20 and the station 16, it is preferable to provide a downstream of the compressor 28 a cooling device 33.
- the activity of this cooler 33 can be controlled automatically as a function of the heating in the compressor 28. In this way, if the temperature of the cold air circulating in the pipe 18 is approximately 120 ° C. it is possible to ensuring that the temperature of the propelling air in line 32, in particular at the time of injection into the oven, is also approximately 120 °.
- the integration of the circuit 22 into the circuit 8 for producing hot wind does not in any way disturb the operation of the latter and in particular the temperature of the hot wind injected into the oven.
- the quantity of cold air required by the mixing station 16 for maintaining a constant temperature of the hot wind is determined by the valve 20 and this quantity will always pass through it. The difference is that part of the air delivered by the valve 20 is no longer sent to the mixing station 16, but through the circuit 22 so that the total amount of cold air mixed with the hot wind produced by the cowpers don't change. Part of the mixing, instead of being carried out in the mixing station 16, is now carried out at the level of the injection of the fuel into the wind carriers or into the nozzles.
- a valve 34 is provided allowing the admission atmospheric air in circuit 22.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
- Feeding And Controlling Fuel (AREA)
- Blast Furnaces (AREA)
Abstract
Des combustibles solides, tels que du charbon ou de la lignite, sont injectés sous forme pulvérulente et par voie pneumatique à travers les tuyères dans un haut fourneau (2). Afin de ne pas perturber la température du vent chaud, on utilise comme fluide de propulsion une partie de l'air froid normalement prévu pour alimenter une station de mélange (16) afin de réduire la température du vent chaud à une température réglée et prédéterminée.Solid fuels, such as coal or lignite, are injected in pulverulent form and pneumatically through the nozzles in a blast furnace (2). In order not to disturb the temperature of the hot wind, a portion of the cold air normally provided for supplying a mixing station (16) is used as propulsion fluid, in order to reduce the temperature of the hot wind to a preset and predetermined temperature.
Description
La présente invention concerne un procédé d'injection de combustibles solides dans un four à cuve, notamment dans un haut fourneau, ainsi qu'une installation pour la mise en oeuvre de ce procédé.The present invention relates to a process for injecting solid fuels into a shaft furnace, in particular into a blast furnace, as well as an installation for carrying out this process.
Un haut fourneau est généralement pourvu d'une conduite circulaire reliée à la base du four par une garniture de porte-vent et de tuyères d'injection de vent chaud qui est produit dans une installation comprenant une soufflante, une batterie de cowpers et une station de mélange ayant deux entrées reliées respectivement à la soufflante et à chacun des cowpers et une sortie alimentant la conduite circulaire en vent chaud à température réglée et constante.A blast furnace is generally provided with a circular duct connected to the base of the furnace by a lining of wind carrier and hot wind injection nozzles which is produced in an installation comprising a blower, a battery of cowpers and a station of mixture having two inlets connected respectively to the blower and to each of the cowpers and an outlet supplying the circular pipe with hot wind at a constant and regulated temperature.
En vue de l'entretien du processus de réduction dans le haut fourneau, le vent chaud est généralement enrichi au moyen d'un combustible que l'on injecte dans ce vent chaud au niveau des tuyères. Jusqu'à présent on a utilisé pour ainsi dire exclusivement des combustibles liquides et plus particulièrement des produits pétroliers. En effet, ces combustibles liquides ont l'avantage d'être très facilement manipulables et les moyens mis en oeuvre pour leur injection dans les tuyères sont simples, peu coûteux et ne perturbent pratiquement pas le fonctionnement d'autres organes ou installations, notamment la température du vent chaud dans lequel ils sont injectés.In order to maintain the reduction process in the blast furnace, the hot wind is generally enriched by means of a fuel which is injected into this hot wind at the level of the nozzles. Until now, liquid fuels, and more particularly petroleum products, have been used, so to speak. Indeed, these liquid fuels have the advantage of being very easy to handle and the means used for their injection into the nozzles are simple, inexpensive and practically do not disturb the operation of other organs or installations, in particular the temperature of the hot wind into which they are injected.
Toutefois, la hausse croissante du prix des produits pétroliers, ainsi que l'épuisement progressif des réserves, ont ouvert la course au remplacement de ces produits par d'autres combustibles, notamment du charbon ou de la lignite. Il est connu que ces combustibles solides pourraient rendre les mêmes services que les combustibles liquides en ce qui concerne l'entretien du processus de réduction dans le haut fourneau. Toutefois, l'une des raisons principales pour lesquelles les combustibles solides n'ont pas été utilisés jusqu'à présent, à cet effet, est qu'on ne disposait pas d'installations de manipulation de combustibles solides qui auraient pu rendre ceux-ci concurrentiels par rapport aux combustibles liquides.However, the increasing rise in the price of petroleum products, as well as the progressive exhaustion of reserves, opened the race to the replacement of these products by other fuels, in particular coal or lignite. It is known that these solid fuels could render the same services as liquid fuels with regard to the maintenance of the reduction process in the blast furnace. However, one of the main reasons why solid fuels have not been used so far, for this purpose, is that there were no solid fuel handling facilities that could have made them competitive with liquid fuels.
L'un de ces problèmes, notamment celui du dosage et du transport par voie pneumatique à contrepression a été résolu par la demande de brevet luxembourgeois No 81.388 du 15 juin 1979. Malgré cela, il subsiste toujours un problème au niveau de l'injection des combustibles solides dans le courant de vent chaud dans les tuyères. En effet, pour la maîtrise parfaite de l'opération du four, il est nécessaire que la température du vent chaud soit constante ou, du moins, qu'elle soit contrôlable. A cet effet, on a prévu en amont de la conduite circulaire une station de mélange dans laquelle on mélange au vent chaud produit dans les cowpers et dont la température est susceptible de fluctuations dans le temps, une certaine quantité d'air froid pour éliminer ces pointes de fluctuations et réduire la température du vent chaud injecté dans le four à une valeur constante. Si l'on utilise la voie pneumatique pour l'injection de combustibles liquides dans les fours il faut envisager des quantités relativement importantes de fluides de propulsion, qui est généralement de l'air. Or, pour éviter un auto-allumage du combustible solide dans les conduites de transport pneumatiques, la température de l'air de propulsion ne peut pas dépasser 80 à 120°C. Autrement dit, non seulement on risque de rendre néant l'effet de la station de mélange en perturbant à nouveau la température du vent chaud au moyen de l'air de propulsion, mais également il faudra, ou bien augmenter la puissance des cowpers pour compenser cette perte de température, ou bien se contenter d'une température opérative du vent chaud plus basse.One of these problems, in particular that of metering and transport by pneumatic backpressure, was resolved by Luxembourg patent application No. 81.388 of June 15, 1979. Despite this, there is still a problem with the injection of solid fuels in the hot wind current in the nozzles. Indeed, for the perfect control of the operation of the oven, it is necessary that the temperature of the hot wind is constant or, at least, that it is controllable. For this purpose, a mixing station has been provided upstream of the circular pipe in which a certain amount of cold air is mixed with the hot wind produced in the cowpers and the temperature of which is liable to fluctuate over time. fluctuation peaks and reduce the temperature of the hot wind injected into the oven to a constant value. If the pneumatic route is used for injecting liquid fuels into ovens, relatively large quantities of propulsion fluids, which is generally air, must be considered. However, to avoid self-ignition of the solid fuel in the pneumatic conveying lines, the temperature of the propelling air cannot exceed 80 to 120 ° C. In other words, not only is there a risk of nullifying the effect of the mixing station by again disturbing the temperature of the hot wind by means of the propelling air, but also it will be necessary, or else increase the power of the cowpers to compensate this loss of temperature, or else be satisfied with a lower operating temperature of the hot wind.
En conséquence, l'objectif de la présente invention est de prévoir un nouveau procédé d'injection de combustibles solides dans un four à cuve qui permette d'éviter les inconvénients précités, c'est-à-dire de ne pas influencer les paramètres d'injection du vent chaud. Un objectif complémentaire de l'invention est la réalisation d'une installation pour la mise en oeuvre de ce procédé.Consequently, the objective of the present invention is to provide a new method for injecting solid fuels into a shaft furnace which makes it possible to avoid the abovementioned drawbacks, that is to say not to influence the parameters d injection of hot wind. A complementary objective of the invention is the production of an installation for the implementation of this process.
Pour atteindre cet objectif, il est prévu un procédé d'injection de combustibles solides dans un four à cuve pourvu d'une conduite circulaire reliée à la base du four par une garniture de porte-vent et de tuyères d'injection de vent chaud, ce vent chaud étant produit dans une installation comprenant une soufflante, une batterie de cowpers et une station de mélange ayant deux entrées reliées respectivement à la soufflante et à chacun des cowpers et une sortie alimentant la conduite circulaire en vent chaud à température réglée et constante, caractérisé en ce que l'on transporte et injecte le combustible solide sous forme pulvérulente, par voie pneumatique, dans chacune des tuyères, en ce que l'on soutire en un point entre la soufflante et la station de mélange une partie de l'air dosé destiné à la station de mélange, en ce que l'on comprime cet air à une pression suffisante pour le transport et l'injection du combustible dans les tuyères et pour la compensation des pertes de charges et en ce que l'on envoie cette partie d'air dans un circuit de transport pneumatique du combustible.To achieve this objective, there is provided a process for injecting solid fuels into a shaft furnace provided with a circular pipe connected to the base of the furnace. by a lining of hot air blower and injection nozzles, this hot wind being produced in an installation comprising a blower, a battery of cowpers and a mixing station having two inlets connected respectively to the blower and to each of the cowpers and an outlet supplying the circular pipe with hot wind at a constant and regulated temperature, characterized in that the solid fuel is transported and injected in pulverulent form, pneumatically, into each of the nozzles, in which it is drawn off at a point between the blower and the mixing station, part of the metered air intended for the mixing station, in that this air is compressed to a pressure sufficient for the transport and injection of the fuel into the nozzles and for the compensation of the pressure drops and in that this part of air is sent in a pneumatic fuel transport circuit.
L'installation pour la mise en oeuvre de ce procédé est essentiellement caractérisée par un circuit parallèle au circuit d'alimentation de la conduite circulaire en vent chaud, branché entre un point situé dans la conduite d'alimentation en air froid de la station de mélange, d'une part et chacune des tuyères d'autre part et comprenant un compresseur et au moins un dispositif d'admission du combustible solide.The installation for implementing this method is essentially characterized by a circuit parallel to the supply circuit of the circular pipe in hot wind, connected between a point located in the cold air supply pipe of the mixing station. on the one hand and each of the nozzles on the other hand and comprising a compressor and at least one solid fuel intake device.
Selon un mode de réalisation avantageux, il est préférable de prévoir immédiatement en aval du compresseur un échangeur thermique afin de réduire la température de l'air à une température égale à celle immédiatement en amont du compresseur, et d'éviter ainsi le dépassement de la température d'auto-allumage du combustible.According to an advantageous embodiment, it is preferable to provide a heat exchanger immediately downstream of the compressor in order to reduce the air temperature to a temperature equal to that immediately upstream of the compressor, and thus avoid exceeding the fuel self-ignition temperature.
Le dispositif d'admission du combustible est de préférence constitué par une série de sas à rotor alvéolaire dont le nombre peut être égal à la moitié du nombre de tuyères de sorte qu'un sas soit associé à une paire de tuyères.The fuel intake device preferably consists of a series of airlock airlocks, the number of which can be equal to half the number of nozzles so that an airlock is associated with a pair of nozzles.
D'autres particularités ressortiront de la description détaillée d'un mode de réalisation présenté ci-dessous, à titre d'exemple, en référence à la figure unique qui montre un schéma synoptique d'une installation d'injection de combustibles solides selon la présente invention.Other particularities will emerge from the detailed description of an embodiment presented below, by way of example, with reference to the single figure which shows a block diagram of a com injection installation. solid bustibles according to the present invention.
Cette figure montre schématiquement un haut fourneau 2 pourvu d'une conduite circulaire 4 d'alimentation en vent chaud. Cette conduite circulaire 4 est reliée à la base du four au moyen d'une série de porte-vent 6 reliés à des tuyères non montrées encastrées dans la paroi du four. Le vent chaud pour l'alimentation de la conduite circulaire 4 et des porte-vent 6 est produit dans une installation 8 comprenant essentiellement une batterie de cowpers 12, 14 bien connus en soi. Ces cowpers sont, en fait, des fours destinés à réchauffer l'air froid en provenance d'une soufflante 10 jusqu'à une température supérieure à celle du vent chaud injecté dans le four. L'opération d'un tel cowper comporte deux phases, à savoir une phase de réchauffement et d'emmagasinage de chaleur et une phase de prélèvement de la chaleur emmagasinée et de réchauffement de l'air froid. Par conséquent, pour assurer une opération continue, il faut au moins une paire de cowpers travaillant en alternance.This figure schematically shows a
La désignation de "froid" de l'air envoyé par la soufflante 10 dans les cowpers 12 et 14 n'est pas significative, étant donné que la température de cet air "froid" est approximativement 100 à 120°C à cause du réchauffement dans la soufflante 10. La température de l'air chaud à la sortie des cowpers dépend des besoins thermiques au niveau de l'injection dans le four. Lorsque l'air chaud injecté dans le four doit avoir.une température d'environ 1200°C, le réchauffement produit dans les cowpers 12, 14 doit monter environ à 1300°C pour compenser les pertes thermiques et pouvoir assurer une température constante dans une station de mélange 16.The designation "cold" of the air sent by the
Le but de cette station de mélange 16 est d'assurer une température constante du vent chaud en vue de son injection dans le four. En effet, il n'est pas possible d'avoir une température constante et uniforme à la sortie des cowpers où il existe toujours des fluctuations de quelques dizaines de degrés. C'est donc la raison pour laquelle il faut chauffer le vent chaud dans les cowpers à une température suffisante afin de pouvoir la réduire à une température uniforme dans la station de mélange 16 par admission d'une quantité dosée de vent froid à travers une conduite 18 reliée à la soufflante 10. La quantité nécessaire d'air froid admis dans la station de mélange 16 à travers la conduite 18 est réglée automatiquement au moyen d'un clapet automatique 20 qui règle le débit d'air froid en fonction de la température du vent chaud dans la conduite circulaire. De cette manière, on est assuré que la température du vent chaud injecté dans le four reste constante.The purpose of this
Cette installation 8 de production de vent chaud telle que représentée sur la figure constitue une installation classique bien connue en soi. Conformément à la présente invention, on greffe sur cette installation 8 un circuit parallèle 22 pour l'injection, par voie pneumatique, de combustibles solides dans chacune des tuyères du four. A cet effet, on a prévu une conduite 24 branchée sur la conduite d'admission d'air froid de la station de mélange 16 entre celle-ci et le clapet 20 et destinée à soutirer la quantité d'air nécessaire pour la propulsion pneumatique du combustible solide. Le réglage de la quantité d'air de propulsion dévié dans la conduite 24 est réglé automatiquement par un clapet 26 en fonction des besoins.This
Dans le circuit 22 on a prévu un compresseur 28 destiné à élever la pression de l'air de propulsion dans le circuit 22 de manière à compenser les pertes de charge et assurer l'injection dans le four. La différence de pression DP réalisée dans le compresseur 28 est généralement de 2 bars en comptant approximativement 1 bar pour la compensation des pertes de charge et une réserve d'un bar pour assurer l'injection. Par conséquent, si la pression du vent chaud à injecter dans le four est d'environ 2,5 bars la pression de l'air de propulsion en aval des compresseurs 28 est environ de 4,5 bars.In
L'admission du combustible solide, sous forme poudreuse ou pulvérulente dans le circuit 22 est effectuée à l'aide d'un sas de soufflage à rotor alvéolaire 30 bien connu en soi. Ce combustible solide, qui peut être de la poudre de lignite ou de la poudre de charbon est ensuite propulsé à travers la conduite 32 dans les tuyères du four. On peut alimenter, par exemple, deux tuyères au moyen d'une seule conduite 32 de sorte que le nombre de conduites 32 et le nombre de sas 30 sera égal à la moitié du nombre de tuyères. Ce rapport peut être changé suivant les besoins.The admission of solid fuel, in powder or powder form into the
Il est à noter que l'air de propulsion subit un réchauffement dans le compresseur 28. Afin d'éviter que la température de l'air de propulsion n'atteigne le seuil d'auto-allumage du combustible solide et, également, pour réduire la température à une valeur approximativement égale à la température à l'endroit de soutirage de l'air de propulsion, c'est-à-dire entre le clapet 20 et la station 16, il est préférable de prévoir en aval du compresseur 28 un dispositif de refroidissement 33. L'activité de ce refroidisseur 33 peut être commandée automatiquement en fonction du réchauffement dans le compresseur 28. De cette manière, si la température de l'air froid circulant dans la conduite 18 est approximativement de 120°C on peut faire en sorte que la température de l'air de propulsion dans la conduite 32, notamment au moment de l'injection dans le four soit également de 120° environ.It should be noted that the propulsion air undergoes heating in the
Comme on peut le constater, l'intégration du circuit 22 dans le circuit 8 de production de vent chaud ne perturbe en aucune manière le fonctionnement de ce dernier et notamment la température du vent chaud injecté dans le four. En effet, la quantité d'air froid demandée par la station de mélange 16 pour le maintien d'une température constante du vent chaud est déterminée par le clapet 20 et cette quantité passera toujours à travers celui-ci. La différence est qu'une partie de l'air débitée par le clapet 20 n'est plus envoyée dans la station de mélange 16, mais à travers le circuit 22 de sorte que la quantité totale d'air froid mélangée au vent chaud produit par les cowpers ne change pas. Une partie du mélange, au lieu d'être effectuée dans la station de mélange 16, est maintenant effectuée au niveau de l'injection du combustible dans les porte-vent ou dans les tuyères.As can be seen, the integration of the
Pour le cas où le four est mis en "veilleuse", c'est-à-dire que la quantité de vent chaud est réduite au minimum, et que le clapet 26-est fermé, on a prévu un clapet 34 permettant l'admission d'air atmosphérique dans le circuit 22.In the case where the oven is put on "sleeper", that is to say that the quantity of hot wind is reduced to a minimum, and that the valve 26-is closed, a
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT80103904T ATE7515T1 (en) | 1979-07-17 | 1980-07-09 | METHOD AND PLANT FOR INJECTING SOLID FUEL INTO A STACK FURNACE. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU81519A LU81519A1 (en) | 1979-07-17 | 1979-07-17 | METHOD AND INSTALLATION FOR INJECTING SOLID FUELS INTO A TANK OVEN |
| LU81519 | 1979-07-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0022549A1 true EP0022549A1 (en) | 1981-01-21 |
| EP0022549B1 EP0022549B1 (en) | 1984-05-16 |
Family
ID=19729201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP80103904A Expired EP0022549B1 (en) | 1979-07-17 | 1980-07-09 | Process and apparatus for the injection of solid fuel into a shaft furnace |
Country Status (13)
| Country | Link |
|---|---|
| US (1) | US4325312A (en) |
| EP (1) | EP0022549B1 (en) |
| JP (1) | JPS5616607A (en) |
| AR (1) | AR221650A1 (en) |
| AT (1) | ATE7515T1 (en) |
| AU (1) | AU536120B2 (en) |
| BR (1) | BR8004523A (en) |
| CA (1) | CA1150505A (en) |
| DE (1) | DE3067831D1 (en) |
| ES (1) | ES494171A0 (en) |
| LU (1) | LU81519A1 (en) |
| PL (1) | PL225726A1 (en) |
| ZA (1) | ZA804195B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0077919A1 (en) * | 1981-10-02 | 1983-05-04 | Paul Wurth S.A. | Process for pneumatically injecting dosed quantities of finely divided solids into a vessel maintained at a variable pressure, and the application of this process to shaft furnaces |
| FR2567997A1 (en) * | 1984-07-23 | 1986-01-24 | Japan Foundry Service Co Ltd | FUSION DEVICE AND METHOD COMPRISING PULVERIZED CHARCOAL SUPPLY, PARTICULARLY IN A TANK OVEN |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5852858U (en) * | 1981-09-28 | 1983-04-09 | テンパール工業株式会社 | Electric leakage or disconnection |
| LU90150B1 (en) * | 1997-10-15 | 1999-04-16 | Kuettner Gmbh & Co Kg Dr | Method and device for blowing reducing agent into a shaft furnace |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE623054A (en) * | 1963-09-03 | |||
| US1505723A (en) * | 1923-01-26 | 1924-08-19 | United Eng Foundry Co | Rotary feed member |
| US1535174A (en) * | 1920-09-29 | 1925-04-28 | Mcgregor Alexander Grant | Art of feeding powdered coal to blast furnaces |
| FR1364215A (en) * | 1962-06-15 | 1964-06-19 | Kellogg M W Co | Injection system for flowable solids, for example for blast furnaces |
| US3197304A (en) * | 1961-10-12 | 1965-07-27 | United States Steel Corp | Method for introducing coal into a blast furnace |
| DE1256149B (en) * | 1964-11-17 | 1967-12-07 | Waeschle Maschf Gmbh | Process for conveying heat-sensitive, powdery or granular material using compressed air |
| LU81388A1 (en) * | 1979-06-15 | 1979-09-12 | Wurth Paul Sa | METHOD AND INSTALLATION FOR DOSING AND PNEUMATIC TRANSPORT OF SOLID MATERIALS TO A PRESSURE VESSEL |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE630649A (en) * | 1962-04-05 | |||
| US3301544A (en) * | 1964-02-18 | 1967-01-31 | Babcock & Wilcox Co | Blast furnace pulverized coal firing system |
| US3371917A (en) * | 1965-10-21 | 1968-03-05 | Buell Engineering Company Inc | Apparatus for feeding fuel into a blast furnace |
-
1979
- 1979-07-17 LU LU81519A patent/LU81519A1/en unknown
-
1980
- 1980-06-25 AU AU59628/80A patent/AU536120B2/en not_active Ceased
- 1980-06-27 AR AR281565A patent/AR221650A1/en active
- 1980-07-04 CA CA000355497A patent/CA1150505A/en not_active Expired
- 1980-07-07 US US06/166,618 patent/US4325312A/en not_active Expired - Lifetime
- 1980-07-09 EP EP80103904A patent/EP0022549B1/en not_active Expired
- 1980-07-09 DE DE8080103904T patent/DE3067831D1/en not_active Expired
- 1980-07-09 AT AT80103904T patent/ATE7515T1/en not_active IP Right Cessation
- 1980-07-11 ZA ZA00804195A patent/ZA804195B/en unknown
- 1980-07-16 ES ES494171A patent/ES494171A0/en active Granted
- 1980-07-16 JP JP9744080A patent/JPS5616607A/en active Pending
- 1980-07-17 BR BR8004523A patent/BR8004523A/en unknown
- 1980-07-17 PL PL22572680A patent/PL225726A1/xx unknown
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1535174A (en) * | 1920-09-29 | 1925-04-28 | Mcgregor Alexander Grant | Art of feeding powdered coal to blast furnaces |
| US1505723A (en) * | 1923-01-26 | 1924-08-19 | United Eng Foundry Co | Rotary feed member |
| US3197304A (en) * | 1961-10-12 | 1965-07-27 | United States Steel Corp | Method for introducing coal into a blast furnace |
| FR1364215A (en) * | 1962-06-15 | 1964-06-19 | Kellogg M W Co | Injection system for flowable solids, for example for blast furnaces |
| BE623054A (en) * | 1963-09-03 | |||
| DE1256149B (en) * | 1964-11-17 | 1967-12-07 | Waeschle Maschf Gmbh | Process for conveying heat-sensitive, powdery or granular material using compressed air |
| LU81388A1 (en) * | 1979-06-15 | 1979-09-12 | Wurth Paul Sa | METHOD AND INSTALLATION FOR DOSING AND PNEUMATIC TRANSPORT OF SOLID MATERIALS TO A PRESSURE VESSEL |
Non-Patent Citations (1)
| Title |
|---|
| IRON AND STEEL ENGINEER, vol. 53, no.8, août 1976, Pittsburgh PA US, C.J. LABEE: "Armco uses pulverized coal injection at Ashland", pages 51-52. * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0077919A1 (en) * | 1981-10-02 | 1983-05-04 | Paul Wurth S.A. | Process for pneumatically injecting dosed quantities of finely divided solids into a vessel maintained at a variable pressure, and the application of this process to shaft furnaces |
| FR2567997A1 (en) * | 1984-07-23 | 1986-01-24 | Japan Foundry Service Co Ltd | FUSION DEVICE AND METHOD COMPRISING PULVERIZED CHARCOAL SUPPLY, PARTICULARLY IN A TANK OVEN |
| GB2163537A (en) * | 1984-07-23 | 1986-02-26 | Japan Foundry Service Co Ltd | Melting apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| ZA804195B (en) | 1981-07-29 |
| AU536120B2 (en) | 1984-04-19 |
| JPS5616607A (en) | 1981-02-17 |
| ES8103579A1 (en) | 1981-03-16 |
| ATE7515T1 (en) | 1984-06-15 |
| EP0022549B1 (en) | 1984-05-16 |
| CA1150505A (en) | 1983-07-26 |
| BR8004523A (en) | 1981-02-03 |
| US4325312A (en) | 1982-04-20 |
| LU81519A1 (en) | 1979-10-31 |
| AU5962880A (en) | 1981-01-22 |
| ES494171A0 (en) | 1981-03-16 |
| PL225726A1 (en) | 1981-05-08 |
| DE3067831D1 (en) | 1984-06-20 |
| AR221650A1 (en) | 1981-02-27 |
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