EP0025400A1 - Process for treating coal for coking and apparatus for carrying out the process - Google Patents

Process for treating coal for coking and apparatus for carrying out the process Download PDF

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Publication number
EP0025400A1
EP0025400A1 EP80401285A EP80401285A EP0025400A1 EP 0025400 A1 EP0025400 A1 EP 0025400A1 EP 80401285 A EP80401285 A EP 80401285A EP 80401285 A EP80401285 A EP 80401285A EP 0025400 A1 EP0025400 A1 EP 0025400A1
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Prior art keywords
coal
introducing
enclosure
hydrocarbon binder
binder
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EP80401285A
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German (de)
French (fr)
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EP0025400B1 (en
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Jean-Claude Kita
Roger Marcel Puff
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Charbonnages de France CDF
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Charbonnages de France CDF
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
    • C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
    • C10B57/06—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition containing additives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
    • C10B57/08—Non-mechanical pretreatment of the charge, e.g. desulfurization
    • C10B57/10—Drying

Definitions

  • the invention relates to a method of treatment by drying and / or preheating of charcoal to be coked by entrainment and / or fluidization in an enclosure by means of a heat transfer gas also serving to pneumatically transport the coal out of the enclosure through a pipe which brings it to a loading station through a separating device, process in which a hydrocarbon binder is injected in the liquid state into the coal during treatment, as well as an installation for the implementation of the process.
  • the aim of the invention is to propose a new process and a new installation which avoid the above drawbacks, that is to say which allow both an improvement in the quality of the coke, a reduction in takeoffs during loading, good performance of dust cyclones and therefore the reduction in their size.
  • Another object of the invention is to allow the reduction of the consumption of hydrocarbon binder each time the quality of the coal to be placed in the oven will allow it. That is to say that it will be necessary to be able to reduce the consumption of hydrocarbon binder to the quantity strictly necessary both for a good yield of the separating cyclones according to the dryer and / or preheater by entrainment and / or fluidization and subsequently to the reduction or elimination of dust flows when loading into the oven,
  • the hydrocarbon binder is a molten product such as pitch or softening point bitumen, determined according to French standard NF - T 66 008, between approximately 30 and 100 ° C., molten, preferably at a temperature between 150 and 260 ° C,
  • the hydrocarbon binder is in the form of a liquid aqueous bitumen emulsion containing approximately 40 to 60% of bitumen of the type of those known for cold coating of materials, such as than road aggregates.
  • the device for introducing a hydrocarbon binder is a device with adjustable flow rate.
  • the rate of the device for introducing hydrocarbon binder is controlled by the flow rate of the device for introducing the coal into the drying and / or preheating chamber, whether the device for introducing the hydrocarbon binder is a device for introducing the binder in the molten state or liquid emulsion state and that this device is a spray device.
  • An installation for the pretreatment of coking coal comprises a grinder-preheater 1 for brcya- gage and preheating in a fluidized bed.
  • This grinder-preheater 1 comprises a fluidization enclosure 2 inside which rotates a hammer mill 3.
  • the fluidization and heating gas for the fluidization and preheating of the coal is produced in a combustion chamber 4 by combustion of gas brought to its burner 5 by a pipe 6 with air forced by a fan 7.
  • the fumes from the pretreatment of the coal are recycled into the combustion chamber by a fan 8.
  • the hot gases from the combustion chamber 4 are brought through a venturi 10 to a vertical pipe 9 for pneumatic transport and pre-drying, into which opens, from a conveyor estimate 11, the coal stored in a hopper 12 where it has been brought by a conveyor 13 from recovery on park 14.
  • the vertical pipe 9 opens, as is known per se, in the enclosure 2 of fluidization and grinding and preheating. From the top of the enclosure 2 leaves a pipe 15 for pneumatic transport of the ground coal and preheated by the fluidization gas again acting as a gaseous transport vector.
  • Line 15 causes the carrier gas and the coal transported to a cyclone battery 16 to the vortex 17 of the last or of the last group which is connected a Cana- 'lisation 18 for collecting gases which are then re - parties in a conduit extraction 19 and a recycling line 20 by the fan 8.
  • the preheated coal is collected ready to be placed in a coke oven, for which it is brought by a conveyor assembly 22 to a hot coal hopper 23.
  • a molten hydrocarbon binder or a liquid emulsion of the type for cold coating is injected into the pneumatic conveying line 15, for example. ple at one or more points D, by means of a nozzle or several spray nozzles supplied by the supply line 24, the flow rate of which is adjustable by means of a valve 25.
  • the adjustable flow rate is controlled by a circuit 30 at the speed of rotation, and therefore at the coal flow rate, of the conveyor screw 11 for introducing coal into the pipe 9, that is to say in the enclosure 2, so that the mass percentage of binder introduced. compared to the treated coal, ie from 0.5 to 3%, and preferably 1%.
  • determining the start of the training zone depends on too many parameters for an entry point C 'to be retained, unless this point C' is so close to the connection zone between the enclosure and the drive line 15 that the gaseous fluid has already taken on a drive regime there and that this connection zone is already ⁇ already in the pneumatic transport zone to the point of constituting, in a way, the beginning of the transport pipe pneumatic.
  • the invention has been described with regard to a fluidization drying and / or preheating installation. It also applies equally well to a drying and / or preheating installation by co-current drive by hot fumes.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

Abstract

Procédé de traitement de charbon à cokéfier et installation pour la mise en oeuvre du procédé. A la sortie d'un broyeur-sècheur 1 par fluidisation, on injecte dans la canalisation 15 d'entraînement pneumatique environ 1 % du bitume fondu ou en émulsion aqueuse. On obtient ainsi un meilleur dépoussièrage par les cyclones 16 et une réduction des envols de poussières lors du chargement en four du coke.Process for treating coking coal and installation for carrying out the process. At the outlet of a grinder-dryer 1 by fluidization, about 1% of the bitumen melted or in aqueous emulsion is injected into the pneumatic drive pipe 15. This gives better dust removal by cyclones 16 and a reduction in the flight of dust when loading coke into the oven.

Description

Procédé de traitement de charbon à cokéfier et installation pour la mise en oeuvre du procédé.Method for treating coking coal and installation for implementing the method.

L'invention concerne un procédé de traitement par séchage et/ou préchauffage de charbon à cokefier par entraînement et/ou fluidisation dans une enceinte au moyen d'un gaz caloporteur servant également à transporter pneumatiquement le charbon hors-de l'enceinte à travers une conduite qui l'amené à un poste de chargement à travers un dispositif séparateur, procédé dans lequel un liant hydrocarboné est injecté à l'état liquide dans le charbon en cours de traitement, ainsi qu'une installation pour la mise en oeuvre du procédé.The invention relates to a method of treatment by drying and / or preheating of charcoal to be coked by entrainment and / or fluidization in an enclosure by means of a heat transfer gas also serving to pneumatically transport the coal out of the enclosure through a pipe which brings it to a loading station through a separating device, process in which a hydrocarbon binder is injected in the liquid state into the coal during treatment, as well as an installation for the implementation of the process.

On a déjà proposé, par le brevet français N° 1265397 d'augmenter la qualité du coke sidérurgique obtenu à partir d'un charbon séché en ajoutant au charbon, avant ou après son séchage, un liant hydrocarboné, constitué par un brai de houille, un brai artificiel ou un bitume, ou encore un extrait ou résidu d'extraction, ledit liant hydrocarboné étant ajouté de façon qu'il prenne une consistance pateuse ou liquide. Un autre avantage connu de l'introduction de liant hydrccarboné est de réduire la quantité d'envols de poussières au moment du chargement du charbon dans le four à coke.It has already been proposed, by French patent No. 1265397 to increase the quality of the steel coke obtained from a dried coal by adding to the coal, before or after its drying, a hydrocarbon binder, constituted by a pitch of coal, an artificial pitch or a bitumen, or an extract or extraction residue, said hydrocarbon binder being added so that it takes on a pasty or liquid consistency. Another known advantage of the introduction of a carbon-based binder is to reduce the quantity of dust flares when the coal is loaded into the coke oven.

Plus récemment, on a proposé, dans la demande de brevet français publiée 2 326 464, d'ajouter le liant hydrocarboné par arrosage et/ou malaxage du charbon, le liant étant préalablement fondu ou mis en émulsion aqueuse.More recently, it has been proposed, in the published French patent application 2 326 464, to add the hydrocarbon binder by sprinkling and / or kneading the coal, the binder being previously melted or put into an aqueous emulsion.

On a également proposé, par le brevet français 2 306 252 d'ajouter le liant hydrocarboné dans l'un des transporteurs du charbon déjà préchauffé et ce juste avant son enfournement pour réduire les envols de poussières lors du chargement dans le four à coke.It has also been proposed, by French patent 2,306,252 to add the hydrocarbon binder in one of the transporters of coal already preheated and this just before it is placed in the oven to reduce the flight of dust during loading in the coke oven.

Mais, dans le cas d'un procédé de préchauffage du type décrit au début, tous ces procédés connus présentent des inconvénients.However, in the case of a preheating process of the type described at the start, all of these known processes have drawbacks.

En effet, si on introduit le liant dans le charbon froid, et donc avant son introduction dans le sécheur et/ou préchauffeur, les grainsde charbon plus ou moins imprégnés du liant hydrocarbonés se trouvent brutalement soumis à la température élevée des fumées de séchage et/ou préchauffage qui sont parfois à 600 ou 800°C. Ce choc thermique a pour effet de vaporiser une partie du liant hydrocarboné qui passe donc en phase vapeur non arrêtée par les électrofiltres et fait perdre de l'efficacité du procédé contre les envols. En outre, le demandeur a pu constater qu'il se forme dans le sécheur et/ou préchauffeur d'importants dépôts, au point d'arrêter l'installation si celle-ci est du type à broyeur interne.Indeed, if the binder is introduced into the cold coal, and therefore before its introduction into the dryer and / or preheater, the coal grains more or less impregnated with the hydrocarbon binder are suddenly subjected to the high temperature of the drying fumes and / or preheating which are sometimes at 600 or 800 ° C. This thermal shock has the effect of vaporizing part of the hydrocarbon binder which therefore passes into vapor phase not stopped by the electrostatic precipitators and causes the process to lose efficiency against take-off. In addition, the applicant has observed that large deposits are formed in the dryer and / or preheater, to the point of stopping the installation if it is of the internal shredder type.

Quant au procédé d'introduction de liant hydrocarboné dans l'un des transporteurs du charbon déjà séché et/ ou préchauffé, il fait perdre l'avantage des procédés précédents,d'amélioration du rendement de captation des cyclones de séparation.As for the process for introducing a hydrocarbon binder into one of the transporters of coal that is already dried and / or preheated, it makes the advantage of the previous processes lose, improving the efficiency of capture of the separation cyclones.

Le but de l'invention est de proposer un nouveau procédé et une nouvelle installation qui évitent les inconvénients précédents, c'est-à-dire qui permettent à la fois une amélioration de la qualité du coke, une réduction des envols lors du chargement, un bon rendement des cyclones de dépoussiérage et donc la réduction de leur encombrement.The aim of the invention is to propose a new process and a new installation which avoid the above drawbacks, that is to say which allow both an improvement in the quality of the coke, a reduction in takeoffs during loading, good performance of dust cyclones and therefore the reduction in their size.

Un autre but de l'invention est de permettre la réduction de la consommation de liant hydrocarboné chaque fois que la qualité du charbon à enfourner le permettra. C'est-à-dire qu'on devra pouvoir réduire la consommation de liant hydrocarboné à la quantité strictement nécessaire à la fois à un bon rendement des cyclones séparateurs suivant le sécheur et/ou préchauffeur par entraînement et/ou fluidisation et consécutivement à la réduction ou à la suppression des envols de poussières lors du chargement dans le four,Another object of the invention is to allow the reduction of the consumption of hydrocarbon binder each time the quality of the coal to be placed in the oven will allow it. That is to say that it will be necessary to be able to reduce the consumption of hydrocarbon binder to the quantity strictly necessary both for a good yield of the separating cyclones according to the dryer and / or preheater by entrainment and / or fluidization and subsequently to the reduction or elimination of dust flows when loading into the oven,

Ces buts sont atteints, selon l'invention, dans un procédé du type décrit au début, grâce au fait qu'on injecte le liant hydrocarboné dans la zone de transport pneumatique du charbon de l'enceinte au dispositif séparateurs.These objects are achieved, according to the invention, in a process of the type described at the start, thanks to the fact that the hydrocarbon binder is injected into the pneumatic transport zone of the coal from the enclosure to the separating device.

Selon une caractéristique avantageuse, le le liant hydrocarboné est un produit fondu tel que brai ou bitume de point de ramollissement, déterminé selon la norme française NF - T 66 008, compris entre 30 et 100°C environ,fondu, de préférence, à une température comprise entre 150 et 260°C,According to an advantageous characteristic, the hydrocarbon binder is a molten product such as pitch or softening point bitumen, determined according to French standard NF - T 66 008, between approximately 30 and 100 ° C., molten, preferably at a temperature between 150 and 260 ° C,

Selon une variante, également avantageuse, le liant hydrocarboné est à l'état d'émulsion aqueuse liquide de bitume contenant 40 à 60 % environ de bitume du type de celles qui sont connues pour l'enrobage à froid de matériaux,tels que granulats routiers.According to a variant, also advantageous, the hydrocarbon binder is in the form of a liquid aqueous bitumen emulsion containing approximately 40 to 60% of bitumen of the type of those known for cold coating of materials, such as than road aggregates.

Les buts de l'invention sont également atteints dans une installation de séchage et/ou préchauffage de charbon à cokéfier comportant :

  • - une enceinte de séchage et/ou préchauffage par échange thermique en régime d'entraînement et/ou fluidisation se continuant par une canalisation de transport pneumatique,
  • - un dispositif d'introduction dans ladite enceinte du charbon à y sécher et/ou préchauffer,
  • - des moyens d'introduction dans ladite enceinte d'un gaz caloporteur à débit sensiblement constant servant également de fluide gazeux d'entraînement et/ou fluidisation du charbon à sécher et d'entraînement du charbon séché et/ou préchauffé dans la canalisation de transport pneumatique,
  • - un dispositif séparateur charbon/gaz dans lequel débouche ladite canalisation de transport pneumatique, par le fait que, pour la mise en oeuvre du procédé, elle comporte, en outre, un dispositif d'introduction de liant hydrocarboné débouchant dans ladite canalisation de transport pneumatique.
The aims of the invention are also achieved in an installation for drying and / or preheating charcoal comprising:
  • - a drying and / or preheating chamber by heat exchange in the drive and / or fluidization regime continued by a pneumatic transport pipe,
  • a device for introducing coal into said enclosure to be dried and / or preheated therein,
  • - Means for introducing into said enclosure a heat transfer gas at a substantially constant flow rate also serving as a gaseous fluid for driving and / or fluidizing the coal to be dried and for driving the dried and / or preheated coal in the transport pipe pneumatic,
  • - a coal / gas separator device into which opens said pneumatic transport pipe, by the fact that, for implementing the method, it further comprises a device for introducing hydrocarbon binder opening into said pneumatic transport pipe .

Il est avantageux que le dispositif d'introduction de liant hydrocarboné soit un dispositif à débit réglable.It is advantageous that the device for introducing a hydrocarbon binder is a device with adjustable flow rate.

Si le dispositif d'introduction du charbon dans l'enceinte de séchage et/ou préchauffage par entraînement et/ou fluidisation est à débit connu et/ou réglable, il est conforme à 1.'invention que le débit du dispositif d'introduction de liant hydrocarboné soit asservi au débit du dispositif d'introduction du charbon dans l'enceinte de séchage et/ou préchauffage, que le dispositif d'introduction du liant hydrocarboné soit un dispositif d'introduction du liant à l'état fondu ou à l'état d'émulsion liquide et que ce dispositif soit un dispositif à pulvérisation.If the device for introducing coal into the drying and / or preheating enclosure by entrainment and / or fluidization is at a known and / or adjustable rate, it is in accordance with the invention that the rate of the device for introducing hydrocarbon binder is controlled by the flow rate of the device for introducing the coal into the drying and / or preheating chamber, whether the device for introducing the hydrocarbon binder is a device for introducing the binder in the molten state or liquid emulsion state and that this device is a spray device.

D'autres caractéristiques et avantages ressortiront de la description qui sera donnée ci-après, uniquement à titre d'exemple, d'un mode de réalisation de l'invention. On se reportera à cet effet à la figure unique annexée qui représente le schéma d'une installation selon l'invention.Other characteristics and advantages will emerge from the description which will be given below, solely by way of example, of an embodiment of the invention. For this purpose, reference is made to the attached single figure. which represents the diagram of an installation according to the invention.

Dans son ensemble, l'invention est décrite dans son application à une installation du même domaine technique que celui de la demande publiée FR 2 378 081.As a whole, the invention is described in its application to an installation of the same technical field as that of the published application FR 2 378 081.

Une installation de traitement préalable de charbon à cokéfier comprend un broyeur-préchauffeur 1 de brcya- ge et préchauffage en lit fluidisé. Ce broyeur-préchauffeur 1 comprend une enceinte de fluidisation 2 à l'intérieur de laquelle tourne un broyeur à marteaux 3. Le gaz de fluidisation et de chauffage pour la fluidisation et le préchauffage du charbon est produit dans une chambre de combustion 4 par combustion de gaz amené à son brûleur 5 par une canalisation 6 avec de l'air pulsé par un ventilateur 7. En outre, les fumées provenant du traitement préalable du charbon sont recyclées dans la chambre de combustion par un ventilateur 8. Les gaz chauds provenant de la chambre de combustion 4 sont amenés à travers un venturi 10 à une canalisation verticale 9 de transport pneumatique et de préséchage, dans laquelle débouche, d'unevis transporteuse 11, le charbon stocké dans une trémie 12 où il a été amené par un transporteur 13 de reprise sur parc 14. La canalisation verticale 9 débouche, comme il est connu en soi, dans l'enceinte 2 de fluidisation et de broyage et préchauffage. Du sommet de l'enceinte 2 part une conduite 15 de transport pneumatique du charbon broyé et préchauffé par le gaz de fluidisation agissant à nouveau comme vecteur gazeux de transport. La conduite 15 amène le gaz vecteur et le charbon transporté à une batterie de cyclone 16 au vortex 17 du dernier ou du dernier groupe desquels est raccordée une cana- ' lisation 18 servant à collecter les gaz qui sont ensuite ré- - partis en une conduite d'extraction 19 et une conduite de recyclage 20 par le ventilateur 8. Aux pointes 21 des cyclones 16, on recueille le charbon préchauffé prêt à être enfourné dans un four à coke, ce pour quoi il est amené par un ensemble transporteur 22 à une trémie à charbon chaud 23.An installation for the pretreatment of coking coal comprises a grinder-preheater 1 for brcya- gage and preheating in a fluidized bed. This grinder-preheater 1 comprises a fluidization enclosure 2 inside which rotates a hammer mill 3. The fluidization and heating gas for the fluidization and preheating of the coal is produced in a combustion chamber 4 by combustion of gas brought to its burner 5 by a pipe 6 with air forced by a fan 7. In addition, the fumes from the pretreatment of the coal are recycled into the combustion chamber by a fan 8. The hot gases from the combustion chamber 4 are brought through a venturi 10 to a vertical pipe 9 for pneumatic transport and pre-drying, into which opens, from a conveyor estimate 11, the coal stored in a hopper 12 where it has been brought by a conveyor 13 from recovery on park 14. The vertical pipe 9 opens, as is known per se, in the enclosure 2 of fluidization and grinding and preheating. From the top of the enclosure 2 leaves a pipe 15 for pneumatic transport of the ground coal and preheated by the fluidization gas again acting as a gaseous transport vector. Line 15 causes the carrier gas and the coal transported to a cyclone battery 16 to the vortex 17 of the last or of the last group which is connected a Cana- 'lisation 18 for collecting gases which are then re - parties in a conduit extraction 19 and a recycling line 20 by the fan 8. At the points 21 of the cyclones 16, the preheated coal is collected ready to be placed in a coke oven, for which it is brought by a conveyor assembly 22 to a hot coal hopper 23.

Selon les procédés précédemment rappelés, il est connu d'introduire 0,5 à 3% en poids de liant hydrocarboné, tel que du goudron de houille dans l'ensemble transporteur 22, en E par exemple. Mais, si cela réduit bien les envols de poussières à l'enfournement, cela n'empêche pas l'entraînement d'une trop grande quantité de poussières dans les gaz recueillis au vortex du dernier cyclone ou dernier groupe de cyclones, d'où perte de charbon par entraînement ou par dé- aradation dans la chambre de combustion 4. Il est également connu d'introduire 5 à 10% de liant hydrocarboné fondu dans le charbon froid, soit stocké sur parc 14, en A par exemple, soit dans un appareil malaxeur, tel que le transporteur a vis 11, c'est-à-dire en B. On a montré au début de la présente demande tous les'inconvénients de ces procédés connus.According to the methods mentioned above, it is known to introduce 0.5 to 3% by weight of hydrocarbon binder, such as coal tar in the conveyor assembly 22, at E for example. But, if this reduces the flight of dust well into the oven, it does not prevent the dragging too much dust in the gases collected at the vortex of the last cyclone or last group of cyclones, resulting in loss of carbon by entrainment or by degradation in the combustion chamber 4. It is also known to introduce 5 to 10% of molten hydrocarbon binder into the cold coal, either stored in the park 14, at A for example, or in a mixing device, such as the screw conveyor 11, that is to say at B. showed at the beginning of the present application all the drawbacks of these known methods.

Selon l'invention, on injecte un liant hydrocarboné fondu ou en émulsion liquide du type pour enrobage à froid dans la conduite 15 de transport pneumatique, par exem- . ple en un ou plusieurs points D, au moyen d'une buse ou plusieurs buses de pulvérisation alimentées par la conduite d'amenée 24, dont le débit est réglable au moyen d'une vanne 25. Le débit réglable est asservi par un circuit 30 à la vitesse de rotation, et donc au débit en charbon, de la vis transporteuse 11 d'introduction du charbon dans la canalisation 9, c'est-à-diré dans l'enceinte 2, de telle sorte que le pourcentage massique de liant introduit. par rapport au charbon traité soit de 0,5 à 3 %, et de préférence 1%.According to the invention, a molten hydrocarbon binder or a liquid emulsion of the type for cold coating is injected into the pneumatic conveying line 15, for example. ple at one or more points D, by means of a nozzle or several spray nozzles supplied by the supply line 24, the flow rate of which is adjustable by means of a valve 25. The adjustable flow rate is controlled by a circuit 30 at the speed of rotation, and therefore at the coal flow rate, of the conveyor screw 11 for introducing coal into the pipe 9, that is to say in the enclosure 2, so that the mass percentage of binder introduced. compared to the treated coal, ie from 0.5 to 3%, and preferably 1%.

Avec un bitume de point de ramolissement compris entre 30 et 100°C fondu entre 150 et 260°C, sans toutefois atteindre sa température de dégradation, et avec une émulsion aqueuse de bitume, du type pour enrobage de granulats routiers, pompable et pulvérisable à température ambiante, utilisée à la température ambiante, le demandeur a obtenu une marche parfaitement stable de l'installation avec un taux de poussières dans les fumées, prélevées à la sortie 28 d'un laveur humide 27 disposé sur la conduite d'extraction 19, de l'ordre de 0,15 g/m3N de fumées sèches. Ce résultat est à comparer à celui d'environ 1,0 g/m3N de fumées sèches qu'on obtient sans introduction de liant. Ce résultat est totalement surprenant, si on le compare à celui résultant de l'introduction de 6% usuels de bitume introduit sur parc (point A)et si on se réfère à la marche instable du sécheur et/ou préchauffeur en cas d'introduction du liant hydrocarboné en B.With a bitumen with a softening point between 30 and 100 ° C melted between 150 and 260 ° C, without however reaching its degradation temperature, and with an aqueous bitumen emulsion, of the type for coating road aggregates, pumpable and sprayable at ambient temperature, used at ambient temperature, the applicant obtained a perfectly stable operation of the installation with a rate of dust in the fumes, sampled at the outlet 28 of a wet washer 27 disposed on the extraction pipe 19, of the order of 0.15 g / m 3 N of dry smoke. This result should be compared to that of approximately 1.0 g / m 3 N of dry smoke obtained without the introduction of a binder. This result is completely surprising, if we compare it to that resulting from the introduction of the usual 6 % of bitumen introduced into the fleet (point A) and if we refer to the unstable operation of the dryer and / or preheater in the event of introduction of the hydrocarbon binder in B.

On pourrait songer à introduire le liant hydrocarboné dans l'enceinte elle-même, par exemple en C. Mais le demandeur a constaté que, si le liant est introduit dans la zon- ne d'action du broyeur, c'est-à-dire dans la zone où des grains insuffisamment broyés retombent dans l'enceinte, on obtient un fonctionnement instable lié à l'encrassement du mobile de broyage et des parois. On pourrait cependant rester conforme aux leçons de l'invention en introduisant le liant à partir d'un point C' de l'enceinte où le charbon suffisamment broyé a pris un régime d'entraînement dans le flux gazeux se dirigeant vers la conduite 15 d'entraînement. Mais la détermination du début de la zone d'entraînement dépend de trop de paramètres pour qu'on retienne un point C' d'introduction, à moins que ce point C' soit si près de la zone de raccord entre l'enceinte et la conduite 15 d'entraînement que le fluide gazeux y ait déjà pris un régime d'entraînement et que cette zone de raccord soit dé÷ jà dans la zone de transport pneumatique au point de constituer, en quelque sorte, le début de la canalisation de transport pneumatique.We could consider introducing the hydro binder carbonaceous in the enclosure itself, for example in C. But the applicant has noted that, if the binder is introduced into the action zone of the mill, that is to say in the zone where grains insufficiently crushed fall back into the enclosure, an unstable operation is obtained linked to the fouling of the grinding mobile and of the walls. One could, however, remain in accordance with the lessons of the invention by introducing the binder from a point C ′ of the enclosure where the sufficiently ground coal has taken a drive regime in the gas flow heading towards the pipe 15 d 'training. However, determining the start of the training zone depends on too many parameters for an entry point C 'to be retained, unless this point C' is so close to the connection zone between the enclosure and the drive line 15 that the gaseous fluid has already taken on a drive regime there and that this connection zone is already ÷ already in the pneumatic transport zone to the point of constituting, in a way, the beginning of the transport pipe pneumatic.

L'invention a été décrite en regard d'une installation de séchage et/ou préchauffage par fluidisation. Elle s'applique tout aussi bien à une installation de séchage et/ou préchauffage par entraînement à co-courant par des fumées chaudes.The invention has been described with regard to a fluidization drying and / or preheating installation. It also applies equally well to a drying and / or preheating installation by co-current drive by hot fumes.

Claims (12)

1°/ Procédé de traitement préalable de charbon à cokéfier par entraînement et/ou fluidisation dans une enceinte au moyen d'un gaz caloporteur servant également à transporter pneumatiquement le charbon hors de l'enceinte à travers une conduite qui l'amène à un poste de chargement à travers un dispositif séparateur, procédé dans lequel un liant hydrocarboné est injecté à l'état liquide dans le charbon en cours de traitement, caractérisé en ce qu'on injecte ledit liant hydrocarboné dans la zone de transport pneumatique du charbon de l'enceinte au dispositif séparateur.1 ° / Process for the preliminary treatment of carbon to be coked by entrainment and / or fluidization in an enclosure by means of a heat-transfer gas also serving to pneumatically transport the coal out of the enclosure through a pipe which brings it to a station loading through a separating device, process in which a hydrocarbon binder is injected in the liquid state into the coal during treatment, characterized in that said hydrocarbon binder is injected into the pneumatic coal transport zone of the enclosure to the separating device. 2°/ Procédé selon la revendication 1, caractérisé en ce qu'on asservit le débit de liant hydrocarboné au débit de charbon introduit dans l'enceinte d'entraînement et/ ou fluidisation.2 ° / A method according to claim 1, characterized in that the flow rate of the hydrocarbon binder is controlled by the flow of coal introduced into the drive and / or fluidization enclosure. 3°/Procédé selon la revendication 1,caractérisé en ce que le liant hydrocarboné est un produit fondu tel que brai ou bitume de point de ramollissement compris entre 30 et 100° environ.3 ° / A method according to claim 1, characterized in that the hydrocarbon binder is a molten product such as pitch or bitumen with a softening point between 30 and 100 ° approximately. 4°/ Procédé selon la revendication 3, caractérisé en ce que le produit fondu est injecté à une température comprise entre 150 et 260°C environ.4 ° / A method according to claim 3, characterized in that the molten product is injected at a temperature between about 150 and 260 ° C. 5°/ Procédé selon la revendication 1, caractérisé en ce que le liant hydrocarboné est une émulsion aqueuse liquide de bitume.5 ° / A method according to claim 1, characterized in that the hydrocarbon binder is a liquid aqueous bitumen emulsion. 6°/ Procédé selon la revendication2, caractérisé en ce que le liant hydrocarboné est ajouté au charbon dans le rapport massique de 0,5 à 3%.6 ° / A method according to claim2, characterized in that the hydrocarbon binder is added to the coal in the mass ratio of 0.5 to 3%. 7°/ Procédé selon la revendication 6, caractérisé en ce que ledit rapport massique est de l'ordre de 1% de bitume.7 ° / A method according to claim 6, characterized in that said mass ratio is of the order of 1% of bitumen. 8°/ Installation de séchage et/ou préchauffage de charbon à cokéfier comportant : - une enceinte (2) de séchage et/ou préchauffage par échange thermique en régime d'entraînement et/ou fluidisation se continuant par une canalisation de transport pneumatique (15), - un dispositif d'introduction (11) dans ladite enceinte (2) du charbon à y sécher et/ou préchauffer, - des moyens d'introduction (9) dans ladite enceinte (2) d'un gaz caloporteur à débit sensiblement constant servant également de fluide gazeux d'entraînement et/ou fluidisation du charbon à sécher et/ou préchauffer et d'entraînement du charbon séché et/ou préchauffé dans la canalisation de transport pneumatique (15); - un dispositif séparateur charbon/gaz (16) dans lequel débouche ladite canalisation de transport pneumatique (15), caractérisé en ce que, pour la mise en oeuvre du procédé selon la revendication 1, elle comporte, en outre, un dispositif d'introduction(24,25)de liant hydrocarboné dans ladite canalisation de transport pneumatique, 8 ° / Installation for drying and / or preheating coking coal comprising: - an enclosure (2) for drying and / or preheating by heat exchange in the drive and / or fluidization regime continuing through a pneumatic transport pipe (15), a device for introducing (11) into said enclosure (2) coal to be dried and / or preheated therein, - means for introducing (9) into said enclosure (2) a heat transfer gas with a substantially constant flow rate also serving as a gaseous fluid for driving and / or fluidizing the coal to be dried and / or preheated and for driving the dried and / or preheated coal in the pneumatic transport pipe (15); - a coal / gas separator device (16) into which opens said pneumatic transport pipe (15), characterized in that, for the implementation of the method according to claim 1, it further comprises an introduction device (24,25) of hydrocarbon binder in said pneumatic transport line, 9°/ Installation selon la revendication 8, caractérisée en ce que le dispositif d'introduction de liant hydrocarboné est un dispositif (25) à débit réglable,9 ° / installation according to claim 8, characterized in that the device for introducing hydrocarbon binder is a device (25) with adjustable flow rate, 10°/ Installation selon la revendication 8, dont le dispositif d'introduction du charbon dans l'enceinte - de séchage et/ou préchauffage par entraînement et/ou fluidisation est à débit connu et/ou réglable, caractérisée en ce que le débit du dispositif d'introduction (24, 25) de liant hydrocarboné est asservi au débit du dispositif d'introduction (11) du charbon dans l'enceinte de séchage et/ou préchauffage (2),10 ° / installation according to claim 8, the device for introducing coal into the enclosure - drying and / or preheating by entrainment and / or fluidization is at known and / or adjustable flow rate, characterized in that the flow rate of the device for introducing hydrocarbon binder (24, 25) is controlled by the flow rate of the device for introducing coal (11) into the drying and / or preheating chamber (2), 11°/ Installation selon la revendication 8, caractérisée en ce que le dispositif d'introduction (24, 25) du liant hydrocarboné est un dispositif d'introduction du liant à l'état fondu ou à l'état d'émulsion liquide,11 ° / installation according to claim 8, characterized in that the device for introducing the hydrocarbon binder (24, 25) is a device for introducing the binder in the molten state or in the state of a liquid emulsion, 12°/ Installation selon la revendication 11, caractérisée en ce que le dispositif d'introduction du liant (24, 25) à l'état fondu est un dispositif à pulvérisation.12 ° / installation according to claim 11, characterized in that the device for introducing the binder (24, 25) in the molten state is a spray device.
EP80401285A 1979-09-10 1980-09-09 Process for treating coal for coking and apparatus for carrying out the process Expired EP0025400B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7922546 1979-09-10
FR7922546A FR2464984A1 (en) 1979-09-10 1979-09-10 PROCESS FOR DRYING AND / OR PREHEATING COKEFIN CHARCOAL AND INSTALLATION FOR CARRYING OUT THE PROCESS

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EP0025400A1 true EP0025400A1 (en) 1981-03-18
EP0025400B1 EP0025400B1 (en) 1982-12-15

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DE3040331A1 (en) * 1980-10-25 1982-05-27 Ruhrkohle Ag, 4300 Essen METHOD FOR CONTROLLING COOK QUALITY
US4985049A (en) * 1989-04-18 1991-01-15 Kim Jung B Manufacturing solid fuel
US20060143978A1 (en) * 2002-10-16 2006-07-06 Suk-Ha Hwang Apparatus for producing water-in-oil emulsifield fuel and supplying the same

Citations (2)

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FR2306252A1 (en) * 1975-04-04 1976-10-29 Bergwerksverband Gmbh METHOD FOR REDUCING DUST ACCUMULATION IN COLLECTORS WHEN LOADING COKE OVENS
FR2378081A1 (en) * 1977-01-24 1978-08-18 Charbonnages De France INSTALLATION AND METHOD OF REGULATING THE PREHEATING OF COKEFYING COAL

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US4030983A (en) * 1975-04-04 1977-06-21 Bergwerksverband Gmbh Method of restricting dust development when feeding coal into coke ovens
US3985516A (en) * 1975-08-20 1976-10-12 Hydrocarbon Research, Inc. Coal drying and passivation process
US3985517A (en) * 1975-08-20 1976-10-12 Hydrocarbon Research, Inc. Coal passivation process

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
FR2306252A1 (en) * 1975-04-04 1976-10-29 Bergwerksverband Gmbh METHOD FOR REDUCING DUST ACCUMULATION IN COLLECTORS WHEN LOADING COKE OVENS
FR2378081A1 (en) * 1977-01-24 1978-08-18 Charbonnages De France INSTALLATION AND METHOD OF REGULATING THE PREHEATING OF COKEFYING COAL

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EP0025400B1 (en) 1982-12-15
FR2464984B1 (en) 1981-09-11
DE3061354D1 (en) 1983-01-20
FR2464984A1 (en) 1981-03-20

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