EP3520926B1 - Dispositif et procédé de pompage de masse fondue chaude - Google Patents

Dispositif et procédé de pompage de masse fondue chaude Download PDF

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Publication number
EP3520926B1
EP3520926B1 EP19155824.6A EP19155824A EP3520926B1 EP 3520926 B1 EP3520926 B1 EP 3520926B1 EP 19155824 A EP19155824 A EP 19155824A EP 3520926 B1 EP3520926 B1 EP 3520926B1
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EP
European Patent Office
Prior art keywords
pipe
pump head
riser pipe
riser
melt
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EP19155824.6A
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German (de)
English (en)
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EP3520926A1 (fr
Inventor
Karl Rimmer
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D35/00—Equipment for conveying molten metal into beds or moulds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F1/00—Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped
    • F04F1/18—Pumps using positively or negatively pressurised fluid medium acting directly on the liquid to be pumped the fluid medium being mixed with, or generated from the liquid to be pumped
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D27/00—Stirring devices for molten material
    • F27D27/005—Pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/14—Charging or discharging liquid or molten material

Definitions

  • Melts are melts made of metals, metal alloys and metal compounds such as sulfides or arsenides.
  • the GB 1125005 A shows the step-by-step pumping of molten metal from one open container into another, higher-lying open container, the outlet of the riser pipe bent at the end simply ending at the edge of the next container.
  • the US 4590988 A also shows a rising pipe bent at the end, which divides into a drain pipe and a ventilation opening at the exit. In these embodiments, the molten metal can come into contact with ambient air.
  • the U.S. 4,666,377 A shows a method and a mammoth pump corresponding to the preamble of claim 1 comprising a Bundles of substantially vertical lifting tubes for lifting liquids, the U.S. 4,666,377 A shows a plurality of tubes side by side and each individual tube has an inside diameter of less than about an inch.
  • the purity of a melt is decisive for the quality of the workpiece or semi-finished product made from it.
  • a reduced purity of the melt can result in further processing, such as casting or atomizing, centrifuging, in particular by means of rotary elements such as centrifugal sieves or Centrifugal cages, negatively affect.
  • the pump head thus forms a housing which, in the operating state, shields the melt and the conveying gas escaping from the melt from the ambient air.
  • the melt flows from the riser pipe to the bottom of the pump head and from there into the discharge pipe without gas bubbles, while the conveying gas emerging from the melt collects at the top of the pump head and escapes or is pumped out via the gas discharge pipe.
  • inert gas is used as the conveying gas, for example nitrogen or other inert gases (for example argon, hydrogen, etc.).
  • a melt filter also known as a frit, is attached in front of the mouth of the conveying gas line or in front of the inlet or in the inlet of the riser pipe.
  • a frit is a porous filter made of glass or ceramic or of combination elements comprising glass and / or ceramic, which distributes the inert gas.
  • the riser pipe is usually a straight pipe.
  • the conveying gas line usually ends at the entrance or something inside the entrance of the riser pipe.
  • the inside diameter of the conveying gas line is usually only 2 to 20% of the inside diameter of the riser pipe.
  • the inside diameter of the riser pipe is usually larger than that of the drain pipe.
  • the inside diameter of the gas discharge pipe is usually smaller than the inside diameter of the riser pipe and the inside diameter of the drain pipe.
  • the pump head has a base which, in the operating state, is located on the underside of the pump head.
  • the riser pipe and the drain pipe usually open into the bottom of the pump head, the gas exhaust pipe usually opens on the wall opposite the bottom (ceiling) or on the upper edge of the pump head.
  • the conveying gas can be discharged and disposed of through the gas discharge pipe, so that no gases or dusts escape in an uncontrolled manner during pumping.
  • the riser pipe viewed in the direction of the riser pipe, protrudes further into the pump head than the drain pipe ensures that, in the operating state, the melt covers the inlet of the drain pipe and thus no reactive gas can get into the drain pipe or the melt flowing in it.
  • the closed pump head ensures that only the conveying gas escaping from the melt, which is an inert gas, is in the pump head. If the gas discharge pipe, which is used to discharge the conveying gas, is defective, at least the discharge pipe would be shielded from the ambient air by the melt.
  • an overflow pipe opens into the pump head in such a way that its end, viewed in the direction of the riser pipe, protrudes further into the pump head than the riser pipe, and that when the device is in operation, melt can flow freely from the pump head . That is, in the operating state of the device is the end of the Overflow pipe higher than the end of the riser pipe and thus in any case higher than the end of the drain pipe.
  • the overflow pipe also ensures that the level of the melt cannot rise above the overflow pipe.
  • the overflow pipe then usually empties again into the container from which the melt is pumped up with the riser pipe, which ensures a closed melt cycle.
  • the inner diameter of the overflow pipe is usually larger than that of the drain pipe, but smaller than or equal to that of the riser pipe. In most cases, the pump head will then have a diameter (normal to the longitudinal axis of the riser pipe) which is greater than the sum of the diameters of the riser pipe and drain pipe and overflow pipe.
  • riser pipe protrudes up to 200 mm, preferably 40-100 mm, into the pump head.
  • drain pipe opens into the bottom of the pump head, it is ensured that the drain pipe does not end above the riser pipe or possibly not above the overflow pipe in the operating state of the device. This is because the bottom of the pump head is the deepest area of the pump head when it is in operation.
  • One embodiment of the invention provides a second riser pipe which is arranged so that melt can be pumped out of the pump head. This means that melt can be pumped out of the pump head to a greater height if the first riser pipe alone is not sufficient for such a great height.
  • the second riser then preferably belongs to a device which is again designed according to the invention. In this way, two or more devices according to the invention can be arranged one above the other in a cascade-like manner. In other words, the sump of the pump head can be used as a suction space for a further pump stage.
  • the device according to the invention can be used for pumping melts made of metals, alloys or metal compounds, in particular for metal compounds such as sulfides or arsenides.
  • a shielding of the environment by the pump head is desirable.
  • At least the riser pipe is preheated during start-up, that is to say, for example, before the conveying gas is switched on.
  • other parts of the device according to the invention can also be preheated. The preheating can prevent damage to the parts of the device according to the invention due to the sudden action of heat from the melt.
  • the device according to the invention can be applied to melts made of metals, metal alloys and metal compounds such as sulfides or arsenides.
  • metals metal alloys and metal compounds
  • metal compounds such as sulfides or arsenides.
  • aluminum, magnesium, tin, lead, copper, iron, nickel, bismuth or zinc come into consideration as metals or as components of the metal alloys or as components of the metal compounds.
  • the individual components of the device according to the invention must be compatible with the melts to be pumped.
  • Steel, graphite or refractory ceramics can be considered.
  • the device can be manufactured from refractory semi-finished products of simple geometry, preferably from tubes and plates.
  • a device according to the invention is shown in operation.
  • the necessary pressure difference between the inlet (suction opening), below, and the outlet (outlet opening), above, of the riser pipe 1 is achieved by introducing inert gas 2 through a conveying gas line 4 into the melt 3.
  • the riser pipe 1 is immersed in a vessel with melt 3, e.g. an oven, pan, or pan.
  • the introduced inert gas 2 forms bubbles 5 in the melt 3.
  • the formation of bubbles can be controlled via a frit 10 (see FIG Fig. 2 ), which is located in front of the mouth of the delivery gas line 4.
  • the resulting temporary gas-melt mixture has a lower density than the melt 3 and rises in the riser pipe 1, which prevents the melt and gas from separating.
  • the mixture finally flows into the pump head 6, which has a much larger cross-section than the riser pipe 1. This is where the two phases separate.
  • the conveying gas can be diverted and disposed of in a controlled manner via the gas discharge pipe 7.
  • the melt can via the drain pipe 8 in a closed Pipe system are conducted.
  • the overflow 9 returns the excess melt to the original melt vessel.
  • the flow rate of the melt 3 can be adjusted by means of the amount of the inert gas 2.
  • the inert gas 2 When introduced, the inert gas 2 is heated up to the melt temperature. It expands and takes up a larger volume, which has a positive effect on gas consumption.
  • Fig. 2 shows an alternative embodiment of the inlet of the riser pipe 1, which widens away from the pump head 6 in the form of a funnel 11.
  • the inlet of the riser pipe 1 made of steel with an inner diameter of 22 mm and a wall thickness of 1.5 mm is immersed to a depth of 500 mm.
  • the conveying gas line 4 made of steel has an inside diameter of 4 mm and a wall thickness of 1 mm.
  • the conveying gas line 4 opens openly and centrally into the riser pipe 1, namely 50 mm above the inlet of the riser pipe 1.
  • Nitrogen is used as the inert gas 2.
  • a gas volume flow of 0.62 Nm 3 / h conveys a melt quantity of 500 kg / h, a gas volume flow of 1.1 Nm 3 / h conveys even 1000 kg / h.
  • the delivery height is 500 mm above the tin melt level of the furnace from which the melt 3 is pumped out.
  • the inlet of the riser pipe 1 made of high-temperature steel with an inner diameter of 30 mm and a wall thickness of 5 mm to a depth of 320 mm is immersed in a magnesium melt at a temperature of 700 °.
  • the Conveying gas line 4 made of steel has an inside diameter of 4 mm and a wall thickness of 1 mm.
  • the conveying gas line 4 opens openly and centrally into the riser pipe 1, namely 50 mm above the inlet of the riser pipe 1.
  • Nitrogen is used as the inert gas 2.
  • a gas volume flow of 0.49 Nm 3 / h conveys a melt quantity of 220 kg / h.
  • the delivery height is 400 mm above the magnesium melt level of the furnace from which the melt 3 is pumped out.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Claims (8)

  1. Dispositif pour pomper des matières en fusion (3) chaudes en utilisant un effet de pompage par air-lift, lequel dispositif comprend
    - un tuyau de montée (1) ouvert aux deux extrémités, dont la sortie est reliée à au moins un tuyau d'écoulement (8) par l'intermédiaire d'une tête de pompe (6),
    - une conduite de gaz de transport (4) qui débouche au niveau de l'entrée du tuyau de montée (1) pour transporter la matière en fusion (3) à travers le tuyau de montée (1),
    - un tuyau d'écoulement (8), à travers lequel de la matière en fusion (3) chaude montant dans le tuyau de montée (1) dans l'état de fonctionnement du dispositif peut s'écouler librement, avec une tête de pompe (6) conçue comme un caisson fermé dans lequel débouchent le tuyau de montée (1) et le tuyau d'écoulement (8), ainsi qu'au moins un tuyau d'extraction de gaz (7) faisant face au tuyau de montée (1) et au tuyau d'écoulement (8) pour extraire le gaz de transport (2), la tête de pompe (6) ayant une plus grande section que le tuyau de montée (1), le tuyau d'écoulement (8) ou le tuyau d'extraction de gaz (7),
    caractérisé en ce que le tuyau de montée (1), vu dans son orientation, dépasse plus loin dans la tête de pompe (6) que le tuyau d'écoulement (8) et en ce qu'un tuyau de trop-plein (9) débouche dans la tête de pompe (6) de telle manière que son extrémité, vue dans l'orientation du tuyau de montée (1), dépasse plus loin dans la tête de pompe (6) que le tuyau de montée (1) et en ce que, dans l'état de fonctionnement du dispositif, de la matière en fusion (3) puisse s'écouler librement hors de la tête de pompe (6).
  2. Dispositif selon la revendication 1, caractérisé en ce que le tuyau de montée (1) dépasse jusqu'à 200 mm, de préférence entre 40 et 100 mm, dans la tête de pompe (6).
  3. Dispositif selon l'une des revendications précédentes, caractérisé en ce que le tuyau d'écoulement (8) débouche dans le fond de la tête de pompe (6).
  4. Dispositif selon l'une des revendications précédentes, caractérisé en ce qu'il est prévu un deuxième tuyau de montée (1) qui est disposé de telle manière que de la matière en fusion (3) puisse être pompée hors de la tête de pompe (6).
  5. Utilisation d'un dispositif selon les revendications précédentes pour le pompage de matières en fusion (3) composées de métaux, d'alliages ou de composés de métaux.
  6. Utilisation selon la revendication 5 pour des matières en fusion (3) à base de sulfures ou d'arséniures.
  7. Procédé pour pomper des matières en fusion (3) chaudes en utilisant un effet de pompage par air-lift, utilisant un dispositif qui comprend
    - un tuyau de montée (1) ouvert aux deux extrémités, dont la sortie est reliée à au moins un tuyau d'écoulement (8) par l'intermédiaire d'une tête de pompe (6),
    - une conduite de gaz de transport (4) qui débouche au niveau de l'entrée du tuyau de montée (1),
    - de préférence un tuyau d'écoulement (8), à travers lequel de la matière en fusion (3) chaude montant dans le tuyau de montée (1) dans l'état de fonctionnement du dispositif peut s'écouler librement,
    - une tête de pompe (6) conçue comme un caisson fermé dans lequel débouchent le tuyau de montée (1) et le tuyau d'écoulement (8) ainsi qu'au moins un tuyau d'extraction de gaz (7) faisant face au tuyau de montée (1) et au tuyau d'écoulement (8) pour extraire le gaz de transport (2), la tête de pompe (6) ayant une plus grande section que le tuyau de montée (1), le tuyau d'écoulement (8) ou le tuyau d'extraction de gaz (7), le tuyau de montée (1), vu dans son orientation, dépassant plus loin dans la tête de pompe (6) que le tuyau d'écoulement (8) et en un tuyau de trop-plein (9) débouchant dans la tête de pompe (6) de telle manière que son extrémité, vue dans l'orientation du tuyau de montée (1), dépasse plus loin dans la tête de pompe (6) que le tuyau de montée (1) et de la matière en fusion (3) pouvant s'écouler librement hors de la tête de pompe (6) dans l'état de fonctionnement du dispositif,
    comprenant les étapes suivantes :
    - immersion de l'entrée du tuyau de montée (1) dans une matière en fusion (3),
    - réglage du débit du gaz de transport (2) de telle matière que le niveau de la matière en fusion (3) dans la tête de pompe (6) se trouve au-dessus de la sortie du tuyau de montée (1).
  8. Procédé selon la revendication 7, caractérisé en ce que le tuyau de montée (1), au minimum, est préchauffé avant l'établissement de l'arrivée du gaz de transport (2).
EP19155824.6A 2018-02-06 2019-02-06 Dispositif et procédé de pompage de masse fondue chaude Active EP3520926B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ATA50111/2018A AT520869A1 (de) 2018-02-06 2018-02-06 Vorrichtung und verfahren zum pumpen heisser schmelzen

Publications (2)

Publication Number Publication Date
EP3520926A1 EP3520926A1 (fr) 2019-08-07
EP3520926B1 true EP3520926B1 (fr) 2021-03-31

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EP (1) EP3520926B1 (fr)
AT (1) AT520869A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1458812A1 (de) * 1965-02-04 1969-02-13 Fried Krupp Huettenwerk Ag Vorrichtung zum Vakuumbehandeln von Schmelzen,insbesondere Stahlschmelzen,und Verfahren zu ihrem Betrieb
DE1458819C3 (de) * 1965-03-31 1975-01-30 Fried. Krupp Gmbh, 4300 Essen Verfahren und Vorrichtung zur kontinuierlichen Herstellung von Stahl aus Rohelsen
US3367396A (en) * 1965-04-05 1968-02-06 Heppenstall Co Installation for the vacuum treatment of melts, in particular steel melts, and process for its operation
US4666377A (en) * 1983-05-06 1987-05-19 Aluminum Company Of America Method and lift pump and raising liquids
JPS6068142A (ja) * 1983-09-26 1985-04-18 Nippon Steel Corp 気泡ポンプによる溶融金属の移送方法
DE102006039611A1 (de) * 2006-08-24 2008-02-28 Ald Vacuum Technologies Gmbh Vorrichtung zum Schmelzen eines Materials und zum Übertragen der Schmelze in eine Kokille oder Verteilerrinne

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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Publication number Publication date
AT520869A1 (de) 2019-08-15
EP3520926A1 (fr) 2019-08-07

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