EP0212296A2 - Device for pneumatically injecting pulverulent materials into a pressure vessel, and its use in injecting pulverulent coal into a shaft furnace - Google Patents

Device for pneumatically injecting pulverulent materials into a pressure vessel, and its use in injecting pulverulent coal into a shaft furnace Download PDF

Info

Publication number
EP0212296A2
EP0212296A2 EP86110057A EP86110057A EP0212296A2 EP 0212296 A2 EP0212296 A2 EP 0212296A2 EP 86110057 A EP86110057 A EP 86110057A EP 86110057 A EP86110057 A EP 86110057A EP 0212296 A2 EP0212296 A2 EP 0212296A2
Authority
EP
European Patent Office
Prior art keywords
silo
distribution
silos
pressure
storage silo
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.)
Withdrawn
Application number
EP86110057A
Other languages
German (de)
French (fr)
Other versions
EP0212296A3 (en
Inventor
Léon Ulveling
Louis Schmit
Edouard Legille
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Paul Wurth SA
Original Assignee
Paul Wurth SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Paul Wurth SA filed Critical Paul Wurth SA
Publication of EP0212296A2 publication Critical patent/EP0212296A2/en
Publication of EP0212296A3 publication Critical patent/EP0212296A3/en
Withdrawn legal-status Critical Current

Links

Images

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 device for the pneumatic injection of pulverulent materials into a pressure vessel, comprising a storage silo, a distribution silo, a series of dosers for extracting the pulverulent materials from the distribution silo, pneumatic transport lines connecting each of the metering units to said enclosure, as well as means for automatically transferring the pulverulent material from the storage silo which is under a substantially atmospheric pressure towards the distribution silo in which there prevails a pressure higher than that of said enclosure.
  • the invention will be described with reference to its most advantageous application, namely the injection of solid fuels into a shaft furnace.
  • a device of the kind described above is known from patent application EP-A-0 079 444.
  • the pulverulent material is transferred from the storage silo to the distribution silo through an intermediate silo which makes airlock function.
  • This intermediate silo is therefore connected alternately through a set of valves to the storage silo and the distribution silo, that is to say that it is alternately pressurized and ventilated. Since the extraction of the pulverulent material from the distribution silo is carried out, permanently, that is to say without interruption, it is necessary that the volume of the intermediate silo is relatively large in order to be able to transfer enough material into the silo of distribution so that there is no interruption during the filling of the intermediate silo.
  • the pipes and valves must be large enough to reduce transfer times from one silo to another.
  • these two silos are connected through sets of valves to an aeration pipe provided with a filter. All these conditions, necessities and precautionary measures however make this installation relatively complex, bulky and, consequently, relatively expensive.
  • the object of the present invention is to provide an improved device of the type described in the preamble, which is simpler and is particularly suitable for small volumes.
  • the device proposed by the present invention is essentially characterized by two intermediate silos each connected by automatic valves, upstream to the storage silo and, downstream, to the distribution silo and a pressurization circuit connecting a source inert gas under pressure through automatic valves at each of the intermediate silos.
  • the low volume of the intermediate silos allows them to be decompressed through the storage silo. This has the double advantage of not having to provide the intermediate silos with an aeration pipe and a filter, on the one hand, and that of a fluidization of the material in the storage silo at the time of ventilation of the intermediate silos, on the other hand, which allows a better flow of the storage silo.
  • the pressurization circuit includes a pressure gauge for monitoring the pressure in the distribution silo and a control valve to compensate, through the intermediate silos, for the pressure losses in the distribution silo caused by extracting pulverulent materials and opening the communication valves between the intermediate silos and the distribution silo.
  • the pressurization of the intermediate silos is carried out by placing in communication with the distribution silo, while the pressurization of the latter is carried out through the intermediate silos.
  • the fact that the intermediate silos are no longer pressurized before the opening of the communication valve with the distribution silo and that the pressure thereof is regulated through each of the intermediate silos has two advantages.
  • This pressure equalization between the two silos obviously leads to a pressure drop of the order of a few tenths of bars in the distribution silo.
  • an agitator is provided at the outlet of the storage silo to keep the material in motion and ensure better flow to the intermediate silos.
  • the powdered coal which is brought, for example, by tanker or railroad, is transferred to a high-capacity storage silo 10, for example of a capacity 100 m3.
  • the level in this storage silo 10 is monitored by a level probe 12 which signals the need for coal refueling.
  • the silo 10 is furthermore provided with aeration towards the atmosphere with a filter 14 as well as an explosion valve 16 to allow the absorption of accidental shock waves.
  • agitator 18 For continuously stirring the powdered coal in order to promote the flow out of the silo 10.
  • This agitator 18 opens the way to two parallel conduits 20A and 20B each provided with valves automatic closing 22.
  • Two intermediate silos 24A and 24B, with low capacity, for example 0.5 m3, are connected upstream to the two lines 20A and 20B and downstream through lines 26A and 26B each provided with automatic valves 28, a distribution silo 30.
  • Each of the intermediate silos 24A, 24B is associated with an upper level sensor 32 intended to automatically control the closing of the valves 22 when filling the intermediate silo, as well as a lower level sensor 34 intended to automatically control the closing of the corresponding valve 28 when emptying the intermediate silo to the distribution silo 30.
  • the distribution silo 30 comprises, at its base, a series of flow pipes 36 i , the number of which depends on the number of nozzles with which the vat furnace in which the powdered coal is injected.
  • Each of these nozzles 36 i opens into a metering device 38 i , for example of the cellular rotator type with variable speed motor to extract predetermined and adjustable quantities of powdered coal.
  • Each of these dosers 38 i is connected through a pressurized air line 40 i to a compressor 42 in order to propel the metered quantities of powdered coal through pipes 44 i to each of the nozzles of the shaft furnace.
  • the intermediate silos 24A and 24B must act as an airlock between these two silos.
  • a pressurization circuit supplied by a line 46 of inert gases under pressure such as, for example, nitrogen.
  • This pipe 46 includes a closing valve 48 and an automatic control valve 52 controlled by a pressure gauge 54 which measures the pressure inside the distribution silo 30. Downstream of the control valve 52, the pipe 46 splits into two branches 46A and 46B each provided with an automatic valve 50A and 50B and opening respectively in the upper part of the intermediate silos 24A and 24B.
  • the intermediate silos 24A and 24B communicate, moreover, through two ventilation pipes 56A, 56B with the storage silo 10 to allow the evacuation of air as the silos 24A, 24B are filled.
  • the upper level sensor 32 detects the filling of the silo 24A, this sensor automatically interrupts communication with the silo 10 by closing the corresponding valves 22. At the same time, the emptying of the silo 24B ends, which is detected by the level probe 34 or a higher level probe 58 associated with the distribution silo 30. Consequently, the valve 28 having allowed communication between the silo 24B and silo 30 is closed automatically.
  • the valve 28 is open to establish communication between the silo 24A and the distribution silo 30.
  • This opening causes the gases under pressure to rise in the silo 30 to silo 24A until pressure equalization between these two silos.
  • This pressure equalization is accompanied by agitation and fluidization of the powdered coal in the silo 24A.
  • the pressure gauge 54 controls the opening valves 52 and 50A for allow the injection of pressurized gas into silo 24A until compensation for the pressure drop in silo 30.
  • the intermediate silo 24B is put in communication with the storage silo 10 by the opening of the valves 22. As of the opening of these, the pressure in the silo 24B is absorbed in the much larger volume of the storage silo 10.
  • the ventilation of intermediate silos through silo 10 is of course made possible by the small volume of silos 24 compared to that of storage silo 10 and has the double advantage of creating fluidization in silo 10 and to make superfluous separate lines with ventilation filter for the intermediate silos 24.
  • the powdered coal can flow from the storage silo 10 through the line 20B in silo 24B, the excess air which can escape progressively through the ventilation duct 56B in silo 10. It should be noted that the automatic valves in the ventilation ducts 56A, 56B are only opened after decompression of the silos s 24 when the flow from silo 10 has started.
  • the filling of the silo 24B ends approximately at the same time as the emptying of the neighboring silo 24A, which is detected by the level probes 32 and 34. From then on, the cycle begins again by inverting the valves and filling the silo 24A and emptying silo 24B.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Blast Furnaces (AREA)

Abstract

L'installation comporte un silo de stockage (10), un silo de distribution (30), une série de doseurs (24A et 38) pour extraire les matières pulvérulentes du silo de distribution (30), des conduites de transport pneumatique (36) reliant chacun des doseurs à ladite enceinte, ainsi que des moyens pour transférer automatiquement la matière pulvérulente du silo de stockage (10) vers le silo de distribution (30). Pour réduire la taille des silos et des conduites, on a prévu deux silos intermédiaires (24A, 24B) reliés chacun à travers des vannes automatiques (22, 28), en amont, au silo de stockage (10) et, en aval, au silo de distribution (30) et un circuit de pressurisation reliant une source de gaz inerte sous pression à travers des vannes automatiques (50A, 50B) à chacun des silos intermédiaires (24A, 24B).The installation comprises a storage silo (10), a distribution silo (30), a series of metering units (24A and 38) for extracting the pulverulent materials from the distribution silo (30), pneumatic conveying lines (36) connecting each of the metering units to said enclosure, as well as means for automatically transferring the pulverulent material from the storage silo (10) to the distribution silo (30). To reduce the size of the silos and pipes, two intermediate silos (24A, 24B) are provided, each connected via automatic valves (22, 28), upstream to the storage silo (10) and, downstream, to the distribution silo (30) and a pressurization circuit connecting a source of inert gas under pressure through automatic valves (50A, 50B) to each of the intermediate silos (24A, 24B).

Description

La présente invention concerne un dispositif pour l'injection pneumatique de matières pulvéru­lentes dans une enceinte sous pression , comprenant un silo de stockage, un silo de distribution , une série de doseurs pour extraire les matières pulvérulentes du silo de distribution , des conduites de transport pneumatique reliant chacun des doseurs à ladite enceinte , ainsi que des moyens pour transférer automatiquement la matière pulvérulente du silo de stockage qui se trouve sous une pression sensiblement atmosphérique vers le silo de distribution dans lequel règne une pression supérieure à celle de ladite enceinte. Quoique n'y étant pas limitée, l'invention sera décrite en référence à son application la plus avantageuse , à savoir l'injection de combustibles solides dans un four à cuve.The present invention relates to a device for the pneumatic injection of pulverulent materials into a pressure vessel, comprising a storage silo, a distribution silo, a series of dosers for extracting the pulverulent materials from the distribution silo, pneumatic transport lines connecting each of the metering units to said enclosure, as well as means for automatically transferring the pulverulent material from the storage silo which is under a substantially atmospheric pressure towards the distribution silo in which there prevails a pressure higher than that of said enclosure. Although not limited thereto, the invention will be described with reference to its most advantageous application, namely the injection of solid fuels into a shaft furnace.

Un dispositif du genre décrit ci-dessus est connu d'après la demande de brevet EP-A-0 079 444. Dans ce dispositif, la matière pulvérulente est transférée du silo de stockage dans le silo de distribution à travers un silo intermédiaire qui fait fonction de sas. Ce silo intermédiaire est donc connecté alternativement à travers un jeu de vannes au silo de stockage et au silo de distribu­tion, c'est-à-dire qu'il est alternativement pressu­risé et aéré. Etant donné que l'extraction de la matière pulvérulente du silo de distribution est réalisée , en permanence, c'est-à-dire sans inter­ruption, il est nécessaire que le volume du silo intermédiaire soit relativement grand pour pouvoir transférer assez de matières dans le silo de distribution afin qu'il ne se produise pas d'inter­ruption pendant le remplissage du silo intermédiaire. Dans le même ordre d'idées, les conduites et les vannes doivent être assez larges pour réduire les temps de transfert d'un silo à l'autre. En outre, pour permettre l'aération du silo intermédiaire et prévoir une sureté pour le silo de distribution, ces deux silos sont reliés à travers des jeux de vannes à une conduite d'aération pourvue d'un filtre. Toutes ces conditions , nécessités et mesures de précaution rendent toutefois cette installation relativement complexe , encombrante et, en conséquence, relativement chère.A device of the kind described above is known from patent application EP-A-0 079 444. In this device, the pulverulent material is transferred from the storage silo to the distribution silo through an intermediate silo which makes airlock function. This intermediate silo is therefore connected alternately through a set of valves to the storage silo and the distribution silo, that is to say that it is alternately pressurized and ventilated. Since the extraction of the pulverulent material from the distribution silo is carried out, permanently, that is to say without interruption, it is necessary that the volume of the intermediate silo is relatively large in order to be able to transfer enough material into the silo of distribution so that there is no interruption during the filling of the intermediate silo. Likewise, the pipes and valves must be large enough to reduce transfer times from one silo to another. In addition, to allow aeration of the intermediate silo and provide security for the distribution silo, these two silos are connected through sets of valves to an aeration pipe provided with a filter. All these conditions, necessities and precautionary measures however make this installation relatively complex, bulky and, consequently, relatively expensive.

Le but de la présente invention est de prévoir un dispositif perfectionné du genre décrit dans le préambule , qui est plus simple et convient notamment pour de petits volumes.The object of the present invention is to provide an improved device of the type described in the preamble, which is simpler and is particularly suitable for small volumes.

Pour atteindre cet objectif, le dispositif proposé par la présente invention est essentiellement caractérisé par deux silos intermédiaires reliés chacun à travers des vannes automatiques , en amont au silo de stockage et, en aval, au silo de distri­bution et un circuit de pressurisation reliant une source de gaz inerte sous pression à travers des vannes automatiques à chacun des silos intermédiaires.To achieve this objective, the device proposed by the present invention is essentially characterized by two intermediate silos each connected by automatic valves, upstream to the storage silo and, downstream, to the distribution silo and a pressurization circuit connecting a source inert gas under pressure through automatic valves at each of the intermediate silos.

Ces silos intermédiaires qui font également fonction de sas entre le silo de stockage et le silo de distribution fonctionnent en alternance , c'est-à-dire que l'un d'eux est relié au silo de stockage pour être rempli pendant que l'autre est relié au silo de distribution pour vider son contenu dans celui-ci.These intermediate silos which also act as an airlock between the storage silo and the distribution silo operate alternately, i.e. one of them is connected to the storage silo to be filled while the another is connected to the distribution silo to empty its content therein.

La présence de deux silos intermédiaires fonctionnant en alternance permet un remplissage quasi continu du silo de distribution au même rythme que l'extraction de la matière pulvérulente de celui-ci. Ceci permet de réduire non seulement le volume de chacun des silos intermédiaires mais également la section des conduites et des vannes. A titre d'exemple, si des conduites de l'installation connue doivent avoir un diamètre de 300 mm , celles prévues dans l'installation selon la présente invention n'ont plus qu'un diamètre de 150 mm. La capacité de chacun des silos intermédiaires peut être réduite à 0,5 m³ pour une capacité du silo de distribution qui est de l'ordre de 7 m³.The presence of two intermediate silos operating alternately allows almost continuous filling of the distribution silo at the same rate as the extraction of powdery material of it. This makes it possible to reduce not only the volume of each of the intermediate silos but also the cross-section of the pipes and valves. For example, if the pipes of the known installation must have a diameter of 300 mm, those provided in the installation according to the present invention have only a diameter of 150 mm. The capacity of each of the intermediate silos can be reduced to 0.5 m³ for a capacity of the distribution silo which is around 7 m³.

Le faible volume des silos intermédiaires permet la décompression de ceux-ci à travers le silo de stockage. Ceci présente le double avantage de ne pas devoir munir les silos intermédiaires d'une conduite d'aération et d'un filtre , d'une part,et celui d'une fluidisation de la matière dans le silo de stockage au moment de l'aération des silos intermédiaires , d'autre part, ce qui permet un meilleur écoulement du silo de stockage.The low volume of the intermediate silos allows them to be decompressed through the storage silo. This has the double advantage of not having to provide the intermediate silos with an aeration pipe and a filter, on the one hand, and that of a fluidization of the material in the storage silo at the time of ventilation of the intermediate silos, on the other hand, which allows a better flow of the storage silo.

Selon une autre caractéristique de la présente invention , le circuit de pressurisation comporte un manomètre de surveillance de la pression dans le silo de distribution et une vanne de régulation pour compenser, à travers les silos intermédiaires, les pertes de pression dans le silo de distribution occasionnées par l'extraction des matières pulvérulentes et l'ouverture des vannes de communication entre les silos intermé­diaires et le silo de distribution. Autrement dit, la pressurisation des silos intermédiaires est réalisée par la mise en communication avec le silo de distribution , tandis que la pressurisation de celui-ci est réalisée à travers les silos inter­médiaires.According to another characteristic of the present invention, the pressurization circuit includes a pressure gauge for monitoring the pressure in the distribution silo and a control valve to compensate, through the intermediate silos, for the pressure losses in the distribution silo caused by extracting pulverulent materials and opening the communication valves between the intermediate silos and the distribution silo. In other words, the pressurization of the intermediate silos is carried out by placing in communication with the distribution silo, while the pressurization of the latter is carried out through the intermediate silos.

Le fait que les silos intermédiaires ne sont plus mis sous pression avant l'ouverture de la vanne de communication avec le silo de distribution et que la pression de celui-ci est réglée à travers chacun des silos intermédiaires présente deux avantages. D'abord, au moment de l'ouverture de la vanne de communication entre le silo de dis­tribution et l'un des silos intermédiaires , la forte pression dans le silo de distribution se répartit dans le silo intermédiaire jusqu'à égali­sation de pression dans les deux silos et la remontée des gaz sous pression dans le silo intermédiaire provoque une fluidisation de la matière pulvérulente dans celui-ci. Cette égalisation de pression entre les deux silos entraîne évidemment une chute de pression de l'ordre de quelques dixièmes de bars dans le silo de distribution. Cette baisse de pression est compensée par l'injection des gaz inertes sous pression dans la partie supérieure du silo intermédiaire qui se trouve en communication avec le silo de distribution. Ceci présente l'avantage que le gaz injecté dans le silo inter­médiaire fait fonction de fluid de propulsion de la matière pulvérulente et permet une vidange plus complète et plus rapide du silo intermédiaire.The fact that the intermediate silos are no longer pressurized before the opening of the communication valve with the distribution silo and that the pressure thereof is regulated through each of the intermediate silos has two advantages. First, when the communication valve opens between the distribution silo and one of the intermediate silos, the high pressure in the distribution silo is distributed in the intermediate silo until the pressure is equalized in the two silos and the rise of pressurized gases in the intermediate silo causes the pulverulent material to fluidize therein. This pressure equalization between the two silos obviously leads to a pressure drop of the order of a few tenths of bars in the distribution silo. This drop in pressure is compensated for by the injection of inert gases under pressure into the upper part of the intermediate silo which is in communication with the distribution silo. This has the advantage that the gas injected into the intermediate silo acts as a propulsion fluid for the pulverulent material and allows a more complete and faster emptying of the intermediate silo.

Selon une autre caractéristique, il est prévu un agitateur à la sortie du silo de stockage pour maintenir la matière en mouvement et assurer un meilleur écoulement vers les silos intermédiaires.According to another characteristic, an agitator is provided at the outlet of the storage silo to keep the material in motion and ensure better flow to the intermediate silos.

D'autres particularités et caractéristiques ressortiront de la description d'un mode de réalisa­tion préféré présenté ci-dessous, à titre d'illus­tration, en référence à la figure unique qui montre un schéma général d'une installation d'injection de charbon en poudre dans un four à cuve.Other features and characteristics will emerge from the description of a preferred embodiment presented below, by way of illustration, with reference to the single figure which shows a general diagram of an installation for injecting coal powder. in a shaft oven.

Le charbon en poudre, qui est amené par exemple, en camion-citerne ou en chemin de fer, est transféré dans un silo de stockage 10 à capacité élevée, par exemple d'une contenance de 100 m³. Le niveau dans ce silo de stockage 10 est surveillé par une sonde de niveau 12 qui signale la nécessité d'un ravitaillement en charbon. Le silo 10 est en outre pourvu d'une aération vers l'atmosphère avec un filtre 14 ainsi que d'un clapet d'explosion 16 pour permettre la résorption d'ondes de choc accidentelles.The powdered coal, which is brought, for example, by tanker or railroad, is transferred to a high-capacity storage silo 10, for example of a capacity 100 m³. The level in this storage silo 10 is monitored by a level probe 12 which signals the need for coal refueling. The silo 10 is furthermore provided with aeration towards the atmosphere with a filter 14 as well as an explosion valve 16 to allow the absorption of accidental shock waves.

A la sortie du silo 10, se trouve un agitateur pour remuer, en permanence , le charbon en poudre afin de favoriser l'écoulement hors du silo 10. Cet agitateur 18 ouvre la voie vers deux conduites parallèles 20A et 20B munies chacune de vannes de fermeture automatiques 22. Deux silos intermédiaires 24A et 24B, à faible capacité, par exemple 0,5 m³ , sont reliés en amont aux deux conduites 20A et 20B et en aval à travers des conduites 26A et 26B pourvues chacune de vannes automatiques 28 , à un silo de distribution 30.At the outlet of the silo 10, there is an agitator for continuously stirring the powdered coal in order to promote the flow out of the silo 10. This agitator 18 opens the way to two parallel conduits 20A and 20B each provided with valves automatic closing 22. Two intermediate silos 24A and 24B, with low capacity, for example 0.5 m³, are connected upstream to the two lines 20A and 20B and downstream through lines 26A and 26B each provided with automatic valves 28, a distribution silo 30.

Chacun des silos intermédiaires 24A , 24B est associé à une sonde de niveau supérieure 32 destinée à commander automatiquement la fermeture des vannes 22 lors du remplissage du silo intermédiaire , ainsi que d'une sonde de niveau inférieure 34 destinée à commander automa­tiquement la fermeture de la vanne correspondante 28 lors de la vidange du silo intermédiaire vers le silo de distribution 30.Each of the intermediate silos 24A, 24B is associated with an upper level sensor 32 intended to automatically control the closing of the valves 22 when filling the intermediate silo, as well as a lower level sensor 34 intended to automatically control the closing of the corresponding valve 28 when emptying the intermediate silo to the distribution silo 30.

Le silo de distribution 30 comporte , à sa base, une série de tubulures d'écoulement 36i dont le nombre dépend du nombre de tuyères dont est équipé le four à cuve dans lequel on injecte le charbon en poudre. Chacune de ces tubulures 36i débouche dans un doseur 38i , par exemple du type à roteur alvéolaire avec moteur à vitesse variable pour extraire des quantités prédéterminées et ajustables de charbon en poudre. Chacun de ces doseurs 38i est relié à travers une conduite d'air sous pression 40i à un compresseur 42 afin de propulser les quantités dosées de charbon en poudre à travers des conduites 44i à chacune des tuyères du four à cuve.The distribution silo 30 comprises, at its base, a series of flow pipes 36 i , the number of which depends on the number of nozzles with which the vat furnace in which the powdered coal is injected. Each of these nozzles 36 i opens into a metering device 38 i , for example of the cellular rotator type with variable speed motor to extract predetermined and adjustable quantities of powdered coal. Each of these dosers 38 i is connected through a pressurized air line 40 i to a compressor 42 in order to propel the metered quantities of powdered coal through pipes 44 i to each of the nozzles of the shaft furnace.

Etant donné que le silo de distribution 30 doit se trouver, en permanence, sous une pression supérieure à celle existant dans le four à cuve , et que le silo de stockage 10 se trouve, en permanence , sous une pression sensiblement atmosphérique, les silos intermédiaires 24A et 24B doivent faire fonction de sas entre ces deux silos. A cet effet, il est prévu un circuit de pressurisation alimenté par une conduite 46 de gaz inertes sous pression comme, par exemple, de l'azote. Cette conduite 46 comporte une vanne de fermeture 48 et une vanne de régulation automa­tique 52 commandée par un manomètre 54 qui mesure la pression à l'intérieur du silo de distribution 30. En aval de la vanne de régulation 52, la conduite 46 se scinde en deux branches 46A et 46B munies chacune d'une vanne automatique 50A et 50B et débouchant respectivement dans la partie supérieure des silos intermédiaires 24A et 24B.Given that the distribution silo 30 must be permanently under a pressure higher than that existing in the shaft furnace, and that the storage silo 10 is always permanently under a substantially atmospheric pressure, the intermediate silos 24A and 24B must act as an airlock between these two silos. To this end, there is provided a pressurization circuit supplied by a line 46 of inert gases under pressure such as, for example, nitrogen. This pipe 46 includes a closing valve 48 and an automatic control valve 52 controlled by a pressure gauge 54 which measures the pressure inside the distribution silo 30. Downstream of the control valve 52, the pipe 46 splits into two branches 46A and 46B each provided with an automatic valve 50A and 50B and opening respectively in the upper part of the intermediate silos 24A and 24B.

Les silos intermédiaires 24A et 24B communiquent , par ailleurs, à travers deux conduites d'aération 56A , 56B avec le silo de stockage 10 pour permettre l'évacuation de l'air au fur et à mesure du remplissage des silos 24A, 24B.The intermediate silos 24A and 24B communicate, moreover, through two ventilation pipes 56A, 56B with the storage silo 10 to allow the evacuation of air as the silos 24A, 24B are filled.

On va maintenant décrire le fonctionnement du dispositif décrit ci-dessus. On va d'abord supposer que le réservoir intermédiaire 24A est en communication à travers la conduite 20A et ses vannes 22 ouvertes avec le silo de stockage 10 et que la vanne 28 bloque la communication de ce silo 24A avec le silo de distribution 30. Pour le silo intermédiaire 24B, la situation est l'inverse, c'est-à-dire que les vannes 22 bloquent la communication avec le silo de stockage 10 tandis que la vanne ouverte 28 établit la commu­nication entre le silo intermédiaire 24B et le silo de distribution 30. Le charbon en poudre s'écoule dès lors du silo de stockage 10 à travers l'agitateur 18 dans le silo intermédiaire 24A. En même temps, le contenu du silo intermédiaire 24B s'écoule dans le silo de distribution 30. Lorsque la sonde de niveau supérieure 32 détecte le remplissage du silo 24A, cette sonde interrompt automatiquement la communication avec le silo 10 par la fermeture des vannes correspondantes 22. En même temps, la vidange du silo 24B se termine, ce qui est détecté par la sonde de niveau 34 ou une sonde de niveau supérieure 58 associée au silo de distribution 30. Dès lors, la vanne 28 ayant permis la communication entre le silo 24B et le silo 30 est fermée automatiquement.We will now describe the operation of the device described above. We will first assume that the intermediate tank 24A is in communication through the line 20A and its valves 22 open with the storage silo 10 and that the valve 28 blocks the communication of this silo 24A with the distribution silo 30. For the intermediate silo 24B, the situation is the opposite, that is to say that the valves 22 block the communication with the storage silo 10 while the open valve 28 establishes communication between the intermediate silo 24B and the distribution silo 30. The powdered coal therefore flows from the storage silo 10 through the agitator 18 into the intermediate silo 24A. At the same time, the content of the intermediate silo 24B flows into the distribution silo 30. When the upper level sensor 32 detects the filling of the silo 24A, this sensor automatically interrupts communication with the silo 10 by closing the corresponding valves 22. At the same time, the emptying of the silo 24B ends, which is detected by the level probe 34 or a higher level probe 58 associated with the distribution silo 30. Consequently, the valve 28 having allowed communication between the silo 24B and silo 30 is closed automatically.

Dès que la communication entre le silo de stockage 10 et le silo intermédiaire 24A est interrompue, la vanne 28 est ouverte pour établir la communication entre le silo 24A et le silo de distribution 30. Cette ouverture provoque une remontée des gaz sous pression dans le silo 30 vers le silo 24A jusqu'à égalisation de pressions entre ces deux silos. Cette égalisation de pression est accompagnée d'une agitation et d'une fluidisa­tion du charbon en poudre dans le silo 24A. Durant cette phase , relativement rapide, il se produit, bien entendu, une chute de pression , de l'ordre de quelques dixièmes de bars , dans le silo 30 , ce qui est détecté par le manomètre 54. Celui-ci commande l'ouverture des vannes 52 et 50A pour permettre l'injection de gaz sous pression dans le silo 24A jusqu'à compensation de la chute de pression dans le silo 30. Toute perte de pression dans le silo 30 occasionnée par l'établissement de la communication avec l'un des silos 24 ou l'ex­traction de matières pulvérulentes est ainsi rétablie à travers le silo intermédiaire corres­pondant et non pas à travers des conduites spé­ciales prévues à cet effet dans les installations selon l'état de la technique. Ceci présente , bien entendu, l'avantage d'épargner les conduites de pressurisation du silo 30 et celui de propulser le charbon hors du silo 24 au moyen du gaz sous pression injecté à travers la conduite 46A.As soon as the communication between the storage silo 10 and the intermediate silo 24A is interrupted, the valve 28 is open to establish communication between the silo 24A and the distribution silo 30. This opening causes the gases under pressure to rise in the silo 30 to silo 24A until pressure equalization between these two silos. This pressure equalization is accompanied by agitation and fluidization of the powdered coal in the silo 24A. During this relatively rapid phase, there is, of course, a pressure drop, of the order of a few tenths of bars, in the silo 30, which is detected by the pressure gauge 54. The latter controls the opening valves 52 and 50A for allow the injection of pressurized gas into silo 24A until compensation for the pressure drop in silo 30. Any loss of pressure in silo 30 caused by the establishment of communication with one of silos 24 or the extraction of pulverulent materials is thus restored through the corresponding intermediate silo and not through special pipes provided for this purpose in installations according to the state of the art. This has, of course, the advantage of sparing the pressurization lines of the silo 30 and that of propelling the coal out of the silo 24 by means of the pressurized gas injected through the line 46A.

Pendant ce temps, le silo intermédiaire 24B est mis en communication avec le silo de stockage 10 par l'ouverture des vannes 22. Dès l'ouverture de celles-ci, la pression dans le silo 24B est résorbée dans le volume beaucoup plus vaste du silo de stockage 10. L'aération des silos inter­médiaires à travers le silo 10 est bien-entendu rendue possible par le faible volume des silos 24 comparé à celui du silo de stockage 10 et présente le double avantage de créer une fluidisation dans le silo 10 et de rendre superflues des conduites séparées avec filtre d'aération pour les silos intermédiaires 24. Dès que le gaz sous pression s'est échappé du silo 24B, le charbon en poudre peut s'écouler du silo de stockage 10 à travers la conduite 20B dans le silo 24B, l'excédent d'air pouvant s'échapper au fur et à mesure à travers la conduite d'aération 56B dans le silo 10. Il est à noter que les vannes automatiques dans les conduites d'aération 56A, 56B ne sont ouvertes qu'après la décompression des silos 24 lorsque l'écoulement du silo 10 à débuté.During this time, the intermediate silo 24B is put in communication with the storage silo 10 by the opening of the valves 22. As of the opening of these, the pressure in the silo 24B is absorbed in the much larger volume of the storage silo 10. The ventilation of intermediate silos through silo 10 is of course made possible by the small volume of silos 24 compared to that of storage silo 10 and has the double advantage of creating fluidization in silo 10 and to make superfluous separate lines with ventilation filter for the intermediate silos 24. As soon as the pressurized gas has escaped from the silo 24B, the powdered coal can flow from the storage silo 10 through the line 20B in silo 24B, the excess air which can escape progressively through the ventilation duct 56B in silo 10. It should be noted that the automatic valves in the ventilation ducts 56A, 56B are only opened after decompression of the silos s 24 when the flow from silo 10 has started.

Le remplissage du silo 24B se termine à peu près en même temps que la vidange du silo voisin 24A, ce qui est détecté par les sondes de niveau 32 et 34. Dès lors, le cycle recommence par l'inversion des vannes et le remplissage du silo 24A et la vidange du silo 24B.The filling of the silo 24B ends approximately at the same time as the emptying of the neighboring silo 24A, which is detected by the level probes 32 and 34. From then on, the cycle begins again by inverting the valves and filling the silo 24A and emptying silo 24B.

Claims (6)

1. - Dispositif pour l'injection pneumatique de matières pulvérulentes dans une enceinte sous pres­sion, comprenant un silo de stockage, un silo de dis­tribution, une série de doseurs pour extraire les matières pulvérulentes du silo de distribution, des conduites de transport pneumatique reliant chacun des doseurs à ladite enceinte, ainsi que des moyens pour transférer automatiquement la matière pulvérulente du silo de stockage qui se trouve sous une pression sensi­blement atmosphérique vers le silo de distribution dans lequel règne une pression supérieure à celle de ladite enceinte, caractérisé par deux silos intermé­diaires (24A, 24B) reliés chacun à travers des vannes automatiques (22, 28),en amont,au silo de stockage (10) et, en aval, au silo de distribution (30) et un circuit de pressurisation reliant une source de gaz inerte sous pression à travers des vannes automatiques (50A, 50B) à chacun des silos intermédiaires (24A, 24B).1. - Device for the pneumatic injection of pulverulent materials into a pressurized enclosure, comprising a storage silo, a distribution silo, a series of metering devices for extracting the pulverulent materials from the distribution silo, pneumatic transport pipes connecting each dosers to said enclosure, as well as means for automatically transferring the pulverulent material from the storage silo which is under a substantially atmospheric pressure towards the distribution silo in which there is a pressure higher than that of said enclosure, characterized by two intermediate silos (24A, 24B) each connected via automatic valves (22, 28), upstream, to the storage silo (10) and, downstream, to the distribution silo (30) and a pressurization circuit connecting a gas source inert under pressure through automatic valves (50A, 50B) at each of the intermediate silos (24A, 24B). 2. - Dispositif selon la revendication 1, caractérisé en ce que le circuit de pressurisation comporte deux branches (46A) (46B) qui sont munies des vannes automatiques (50A) (50B) et qui débouchent respectivement dans la partie supérieure de chacun des silos intermédiaires (24A) (24B).2. - Device according to claim 1, characterized in that the pressurization circuit comprises two branches (46A) (46B) which are provided with automatic valves (50A) (50B) and which open respectively in the upper part of each of the silos intermediates (24A) (24B). 3. - Dispositif selon la revendication 1, caractérisé en ce que le circuit de pressurisation comporte un manomètre (54) de surveillance de la pression dans le silo de distribution (30) et une vanne de régulation (52) pour compenser, à travers les silos intermédiaires (24A, 24B), les pertes de pression dans le silo de distribution (30).3. - Device according to claim 1, characterized in that the pressurization circuit comprises a pressure gauge (54) for monitoring the pressure in the distribution silo (30) and a control valve (52) to compensate, through the intermediate silos (24A, 24B), pressure losses in the distribution silo (30). 4. - Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé par un agitateur (18) à la sortie du silo de stockage (10).4. - Device according to any one of claims 1 to 3, characterized by an agitator (18) at the outlet of the storage silo (10). 5. - Dispositif selon l'une quelconque des revendications 1 à 4, caractérisé par un filtre (14) sur le silo de stockage (10) pour l'aération du silo de stockage (10) et de chacun des silos intermédiaires (24A) (24B).5. - Device according to any one of claims 1 to 4, characterized by a filter (14) on the storage silo (10) for the ventilation of the storage silo (10) and each of the intermediate silos (24A) (24B). 6. - Application du dispositif selon l'une quelconque des revendications 1 à 5 à l'injection de combustibles solides dans un four à cuve.6. - Application of the device according to any one of claims 1 to 5 to the injection of solid fuels into a tank furnace.
EP86110057A 1985-08-21 1986-07-22 Device for pneumatically injecting pulverulent materials into a pressure vessel, and its use in injecting pulverulent coal into a shaft furnace Withdrawn EP0212296A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU86048A LU86048A1 (en) 1985-08-21 1985-08-21 DEVICE FOR THE PNEUMATIC INJECTION OF POWDERY MATERIALS INTO A PRESSURE ENCLOSURE AND APPLICATION TO THE INJECTION OF SOLID FUELS IN A TANK OVEN
LU86048 1985-08-21

Publications (2)

Publication Number Publication Date
EP0212296A2 true EP0212296A2 (en) 1987-03-04
EP0212296A3 EP0212296A3 (en) 1988-03-02

Family

ID=19730534

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86110057A Withdrawn EP0212296A3 (en) 1985-08-21 1986-07-22 Device for pneumatically injecting pulverulent materials into a pressure vessel, and its use in injecting pulverulent coal into a shaft furnace

Country Status (8)

Country Link
US (1) US4702288A (en)
EP (1) EP0212296A3 (en)
JP (1) JPS6246814A (en)
AU (1) AU6166786A (en)
BR (1) BR8604034A (en)
ES (1) ES2000788A6 (en)
LU (1) LU86048A1 (en)
ZA (1) ZA865791B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0363656A1 (en) * 1988-10-12 1990-04-18 Leybold Aktiengesellschaft Powder replenishing device, especially for a vacuum spray coating apparatus
EP0504581A2 (en) * 1991-03-20 1992-09-23 Paul Wurth S.A. Process and device for the treatment of pulverulent coal in an installation for injecting solid fuels
WO2014006073A1 (en) 2012-07-06 2014-01-09 Paul Wurth S.A. Installation for distributing pulverulent substance by pneumatic transportation, comprising a device for depressurizing a pressurized reservoir in which said substance is stored

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9409851D0 (en) * 1994-05-17 1994-07-06 Cambridge Consultants Improvements in and relating to containers of particulate material
AT402816B (en) * 1995-10-19 1997-09-25 Voest Alpine Ind Anlagen METHOD FOR CONVEYING A FINE-PARTICLE SOLID
SG73602A1 (en) * 1999-01-12 2001-10-16 Sky Technology Pte Ltd Bulk conveying and distribution system, method for controlling the same and pneumatic conveying method
US6561980B1 (en) 2000-05-23 2003-05-13 Alpha Intervention Technology, Inc Automatic segmentation of prostate, rectum and urethra in ultrasound imaging
GB0512998D0 (en) * 2005-06-27 2005-08-03 Inbulk Technologies Ltd Pneumatic conveying velocity control device
CA2854797A1 (en) 2011-04-04 2012-10-11 Proven Technologies Llc Lc Accurate dry bulk handling system and method of use
LU92916B1 (en) * 2015-12-17 2017-07-13 Wurth Paul Sa Grinding and drying plant
CN108408414B (en) * 2018-03-19 2020-04-28 中冶华天南京工程技术有限公司 Novel powder material tank-combining uniform conveying system
CN112176143A (en) * 2020-09-25 2021-01-05 中冶南方工程技术有限公司 Double-intermediate-ash-bin ash discharging system and method for gravity dust removal and ash discharging of blast furnace

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB324392A (en) * 1928-10-25 1930-01-27 Polysius G A method of and apparatus for conveying materials in bulk by means of compressed air
DE544794C (en) * 1928-11-03 1932-02-22 Polysius Akt Ges G Process for conveying powdery bulk goods using compressed air
DE862429C (en) * 1951-07-28 1953-01-12 Johannes Moeller Vessel conveyor with a jet pump for pneumatic conveying powdery and grainy goods
EP0027909A1 (en) * 1979-10-26 1981-05-06 Krupp Polysius Ag Installation for conveying fine-grained material
EP0079444A1 (en) * 1981-10-19 1983-05-25 Paul Wurth S.A. Apparatus for controlling the capacity and charge of a distribution vessel for pulverized materials

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2556162C2 (en) * 1975-12-13 1985-02-28 Krupp Koppers GmbH, 4300 Essen Device and method for introducing fine-grained to pulverulent fuels into a gasification device under increased pressure
DE3114338C2 (en) * 1981-04-09 1985-06-13 Carl Still Gmbh & Co Kg, 4350 Recklinghausen Method and device for the volumetric determination of a furnace charge
US4545410A (en) * 1984-01-30 1985-10-08 Cyclonaire Corporation System for transferring dry flowable material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB324392A (en) * 1928-10-25 1930-01-27 Polysius G A method of and apparatus for conveying materials in bulk by means of compressed air
DE544794C (en) * 1928-11-03 1932-02-22 Polysius Akt Ges G Process for conveying powdery bulk goods using compressed air
DE862429C (en) * 1951-07-28 1953-01-12 Johannes Moeller Vessel conveyor with a jet pump for pneumatic conveying powdery and grainy goods
EP0027909A1 (en) * 1979-10-26 1981-05-06 Krupp Polysius Ag Installation for conveying fine-grained material
EP0079444A1 (en) * 1981-10-19 1983-05-25 Paul Wurth S.A. Apparatus for controlling the capacity and charge of a distribution vessel for pulverized materials

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0363656A1 (en) * 1988-10-12 1990-04-18 Leybold Aktiengesellschaft Powder replenishing device, especially for a vacuum spray coating apparatus
EP0504581A2 (en) * 1991-03-20 1992-09-23 Paul Wurth S.A. Process and device for the treatment of pulverulent coal in an installation for injecting solid fuels
EP0504581A3 (en) * 1991-03-20 1993-01-27 Paul Wurth S.A. Process and device for the treatment of pulverulent coal in an installation for injecting solid fuels
WO2014006073A1 (en) 2012-07-06 2014-01-09 Paul Wurth S.A. Installation for distributing pulverulent substance by pneumatic transportation, comprising a device for depressurizing a pressurized reservoir in which said substance is stored
CN104541119A (en) * 2012-07-06 2015-04-22 保罗沃思公司 Installation for distributing pulverulent substance by pneumatic transportation, comprising a device for depressurizing a pressurized reservoir in which said substance is stored
CN104541119B (en) * 2012-07-06 2016-01-20 保罗沃思公司 For distributing flour and the device comprised for the equipment making the pressurizing reservoir of the described material of storage reduce pressure by pneumatic transportation
US10823506B2 (en) 2012-07-06 2020-11-03 Paul Wurth S.A. Installation for distributing pulverulent substance by pneumatic transportation, comprising a device for depressurizing a pressurized reservoir in which said substance is stored

Also Published As

Publication number Publication date
ZA865791B (en) 1987-06-24
AU6166786A (en) 1987-02-26
ES2000788A6 (en) 1988-03-16
EP0212296A3 (en) 1988-03-02
LU86048A1 (en) 1987-03-06
JPS6246814A (en) 1987-02-28
BR8604034A (en) 1987-06-30
US4702288A (en) 1987-10-27

Similar Documents

Publication Publication Date Title
EP0212296A2 (en) Device for pneumatically injecting pulverulent materials into a pressure vessel, and its use in injecting pulverulent coal into a shaft furnace
CA1157661A (en) Process and installation for metering and for transport of solid material by a pneumatic passage into a pressurized chamber
EP0606608B1 (en) Process for the evacuation of solid residu from a gaspurification installation.
EP0079444A1 (en) Apparatus for controlling the capacity and charge of a distribution vessel for pulverized materials
EP0142437B1 (en) Method and device for reinjecting flyash particles into a boiler for solid fuel
EP0145578A2 (en) Chromatographic apparatuses
FR2523097A1 (en) PROCESS AND DEVICE FOR THE PNEUMATIC TRANSPORT OF GRANULAR AND POWDERY PRODUCTS
BE1000194A3 (en) Loading installation of four a tank.
CA1235170A (en) Closed device for potential fluidization intended for thick bed horizontal transport of powdery materials
EP0032206A1 (en) Process for pneumatically injecting dosed quantities of finely divided solids into a vessel maintained at variable pressure
EP0037460B1 (en) Process and installation for regulating pressure and fluidisation of a pulverized mass in a distribution container
EP0447527B1 (en) Hydrocarbon vapocracking installation with recycling of erosive solid particles
US4344823A (en) Discharging method and apparatus for dry coke cooling chambers
FR2750689A1 (en) Filling cylinders with liquid petroleum gas
US3542218A (en) Apparatus for closing the coal hopper outlet on a larry car
JP2003164749A (en) Apparatus and method for feeding material to be treated
FR2551457A2 (en) Process and plant for carrying out a decomposition in anaerobic environment of organic products, byproducts and waste
FR2507744A1 (en) METHOD AND DEVICE FOR DOSED EVACUATION, IN PARTICULAR BINDING HOT ASHES, FROM TURBULENT LAYER REACTORS AND FLUIDIZED LAYER FIREPLACES
EP0190592B1 (en) Process and apparatus for pneumatically injecting dosed quantities of finely divided solids into a vessel under pressure and the application of this process to shaft furnaces
EP4061564A1 (en) Module for supplying additive manufacturing powder allowing drying of the powder
EP0043606B1 (en) Method and apparatus for the uniform pneumatic conveyance of finely divided solids and application to the injection of solid fuels into a shaft furnace
EP0398814B1 (en) Particle evacuation device from a fluidised bed outside the fluidised bed vessel
FR2519016A1 (en) LOADING TROLLEY FOR A BATTERY OF COKE OVENS
EP0077919A1 (en) 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
JP2005343656A (en) Powder and granular material supply device, combustion device, and its operation method

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE DE FR GB IT NL SE

17P Request for examination filed

Effective date: 19870529

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE DE FR GB IT NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19880905

RIN1 Information on inventor provided before grant (corrected)

Inventor name: SCHMIT, LOUIS

Inventor name: LEGILLE, EDOUARD

Inventor name: ULVELING, LEON