EP0530636B1 - Dispositif pour le traitement méchanique de poudres en particulier de poudres combustibles des centrales nucléaires - Google Patents

Dispositif pour le traitement méchanique de poudres en particulier de poudres combustibles des centrales nucléaires Download PDF

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Publication number
EP0530636B1
EP0530636B1 EP92114423A EP92114423A EP0530636B1 EP 0530636 B1 EP0530636 B1 EP 0530636B1 EP 92114423 A EP92114423 A EP 92114423A EP 92114423 A EP92114423 A EP 92114423A EP 0530636 B1 EP0530636 B1 EP 0530636B1
Authority
EP
European Patent Office
Prior art keywords
powder
vessel
feed
safety device
metering
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92114423A
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German (de)
English (en)
Other versions
EP0530636A1 (fr
Inventor
Gerd Dr. Kindleben
Wilhelm Königs
Hans-Peter Schneider
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0530636A1 publication Critical patent/EP0530636A1/fr
Application granted granted Critical
Publication of EP0530636B1 publication Critical patent/EP0530636B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • B01F35/88—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise
    • B01F35/881—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise by weighing, e.g. with automatic discharge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/60—Mixing solids with solids

Definitions

  • the invention relates to a device for mechanical processing of powder, in particular nuclear fuel powder, according to the preamble of patent claim 1.
  • the invention has for its object to develop the device for mechanical processing of powder and to monitor the process control for correctness to the extent that no critical powder mass can form in the process container.
  • the fact that the safety device blocks the conveying device when the sum of the masses of the individual portions conveyed into the process container reaches a predetermined first limit value ensures that the total powder mass which has entered the process container from the metering container cannot in itself build up a critical mass in the process container.
  • the fact that the safety device also blocks the conveying device when the powder mass measured in the receptacle after emptying the process container in the receptacle differs from the sum of the powder masses of the individual portions conveyed into the process container by a predetermined value or more ensures that by conveying Powder with the dosing container in the process container, the residual powder mass (hold up) inevitably retained in the process container cannot form a critical mass with the supplied powder mass.
  • the claims 2 to 6 are directed to advantageous developments of the device according to the invention.
  • the development according to claim 3 takes into account the fact that the presence of a sufficiently large mass of powder, which reduces criticality, can be used to promote criticality-causing powder into the process container.
  • the development according to claim 4 takes into account the fact that too much of the criticality-causing powder must not get into the process container.
  • the development according to claim 5 monitors that not too much powder can get into the receptacle.
  • the device for mechanically processing nuclear fuel powder has a process container 2 which is mounted in fixed bearings 3 so as to be pivotable about a horizontal pivot axis.
  • This process container 2 can be, for example, a ball mill or a mixer.
  • a swivel motor 4 for swiveling the process container 2 about the horizontal swivel axis is assigned to this process container 2.
  • the process container 2 also has a filler neck 5, in which a closure body 6, which can be rotated about a transverse axis and has a passage channel 7 for powder to be processed, is mounted.
  • a scale 8 hangs over the process container 2.
  • a vertical rod 9 with one coupling half of a coupling 10 hangs on this scale 8, in turn, a further vertical rod 11 hangs on the other coupling half of the coupling 10, which has a powder conveying device 12 and one below this powder conveying device 12 located dosing vessel 13 passes through.
  • This metering vessel 13 has a wide upper filling opening 13a and a narrow lower emptying opening 13b.
  • At the bottom has vertical rod 11 a sealing cone 14 tapering towards the upper end of the rod 11, which is loosely fitted into the lower emptying opening 13b.
  • This sealing cone 14 tightly closes the lower emptying opening 13b of the metering vessel 13.
  • the metering vessel 13 with its lower emptying opening 13b sits firmly on the jacket of the sealing cone 14 and thus hangs with the rod 11 on the lower coupling half of the coupling 10.
  • the powder conveying device 12 has two separate conveying paths 15 and 16. There are conveying coils 15a and 16a in each conveying path. Each feed spiral 15a and 16a has an electric drive motor 15b and 16b, respectively. Each conveyor path 15 and 16 has a feed opening 15c and 16c and an outlet opening 15d and 16d. While the feed openings 15c and 16c are each connected to a storage container (not shown), the outlet openings 15d and 16d open downwards into the upper fill opening 13a of the metering vessel 13.
  • a lifting device 17 with an electric lifting motor 17a acts on the rod 11. Furthermore, a metal strip 18a is attached to the rod 11 and is associated with a detection device 18 consisting of a proximity switch for detecting the closed position of the lower emptying opening 13b of the metering vessel 13. Similarly, on the outside of the metering vessel 13, a metal strip 19a is attached, which is associated with a detection device 19 consisting of a proximity switch for the readiness of the scale 8 for weighing the contents of the metering vessel 13.
  • the metal process container 2 is associated with a detection device 21 consisting of a proximity switch for detecting the emptying position of the process container 2.
  • a signal line 25 leads from the scale 8
  • a signal line 26 leads from the scale 22
  • a signal line 27 from the recognition device 18 leads from the scale 22
  • a signal line 28 from the recognition device 19 leads from the input of an electronic safety device 31.
  • An electrical feed line 32 leads to the swivel motor 4 of the process container 2, an electrical feed line 33 to the drive motor 15b of the feed spiral 15a and an electrical feed line 34 to the electric drive motor 16b of the feed spiral 16a.
  • a switching device 35 to 37 is located in each of the feed lines 32 to 34. Signal lines 38 to 40 lead to these switching devices 35 to 37 from the output of the electronic safety device 31.
  • the switching devices 35 to 37 are switches 41 to 43 in the electrical feed lines 32 to 34 upstream. These switches 41 to 43 belong to a process control device that can work manually or automatically. Between the switching device 36 and the switch 42, a signal line 39a goes from the electrical feed line 33 to the signal input of the safety device 31 and between the switching device 37 and switch 43 from the electrical feed line 34 a signal line 40a to the signal input of the safety device 31.
  • an electrical feed line leading to the electric lifting motor 17a which also has a switch belonging to the process control device.
  • an electrical feed line is also not shown to the excitation coil of the clutch 10 and this feed line also contains a switch belonging to the process control device.
  • the scale 8 in FIG. 1 has two bending beam scales 44 and 45 assembled in series.
  • Each bending beam scale consists of a steel rod with a rectangular cross-section.
  • each steel rod On a side parallel to the plane of the drawing in FIG. 2, each steel rod has in the middle two continuous bores 44a and 44b or 45a and 45b which are perpendicular to this side, the cross sections of which partially overlap.
  • Strain gauges 44c and 45c are attached to the two sides of each steel rod, to which the two through bores 44a and 44b or 45a and 45b are parallel, where the diameters of the two bores are perpendicular to these sides .
  • the two bending beam scales 44 and 45 are arranged overlapping one another at a distance from one another and in the vertical longitudinal direction.
  • the lower cantilever scale 45 hangs at one end on one end of the upper cantilever scale 44, while the other end of the upper cantilever scale 44 e.g. is suspended from a frame, not shown.
  • the rod 9 hangs at the other end of the lower bending beam scale 45.
  • the four strain gauges 44c and 45c on each bending beam scale 44 and 45 are each connected in a Wheatstone bridge.
  • the output of the Wheatstone bridge formed by the strain gauges 44c of the beam balance 44 is connected to the process control device by a signal line, not shown.
  • the output of the Wheatstone bridge formed by the strain gauges 45c of the other bending beam scales 45 is led through the signal line 25 to the signal input of the safety device 31.
  • the switch 42 is first closed by a suitably programmed process control device or by hand, so that the drive motor 15b drives the conveying spiral 15a of the conveying path 15 of the conveying device 12 and, for example, UO2 powder naturally enriched with U 235 in the metering container 13 is promoted.
  • the conveying path 15 is the permitted conveying path, so that the safety device 31 does not actuate the switching device 36 and does not interrupt the feed line 33 leading to the drive motor 15b. If, on the other hand, the switch 43 had been actuated first, the conveyor motor 16b would have had to drive the conveyor spiral 16a of the conveyor path 16.
  • the conveyor path 16 is not permitted, however, so that the safety device 31 would have opened the switching device 37 and would have blocked the conveyor path 16. In addition, the safety device 31 could also have blocked the switching device 36 and thus the entire conveyor device 12.
  • the detection device 18 also signals via the signal line 27 that the lower emptying opening 13b of the metering vessel 13 is closed. Since the coupling 10 is closed, the detection device 19 can also signal readiness for weighing for the metering vessel 13 via the signal line 28 to the monitoring device 31, and the safety device 31 measures the mass of the powder in the metering vessel 13 determined by the balance 8 and which was conveyed through the conveying path 15 into the metering vessel 13. The measured mass is summed up and stored both in a component memory of the safety device 31 assigned to the conveying path 15 and in an overall memory of this safety device 31.
  • the process control device After switching off the conveyor motor 15b by opening the switch 42 by the process control device, the process control device releases the clutch 10 and actuates the lifting motor 17a, so that the lifting device 17 lowers the rod 11 with the dosing vessel 13 attached to it and with the lower emptying opening 13b settles on the filler neck 5 of the process container 3.
  • the closure body 6 in the filler neck 5 is rotated so that the passage 7 in the closure body 6 is directed vertically.
  • the rod 11 is lowered even further with the lifting device 17, so that the sealing cone 14 opens the lower emptying opening 13b of the metering vessel 13 and the powder trickles out of the metering vessel 13 into the process container 2.
  • the process control device then operates the lifting motor 17a in the opposite direction, and the lifting device 17 lifts the rod 11 again.
  • the sealing cone 14 again closes the lower emptying opening 13b and finally the rod 11 lifts the metering vessel 13 and carries it back into the filling position shown in FIG. 1.
  • the rod 11 automatically couples to the rod 9 again via the coupling 10, and the metering vessel 13 is again ready for weighing.
  • the safety device 31 adds up the masses of the UO 2 powder filled in portions from the metering device 13 via the conveying path 15 into the process container 2. When the sum of these masses reaches a predetermined limit value, the safety device releases the blocking of the conveying path 16 by keeping the switching device 37 closed and opening the switching device 36 when the switch 43 is actuated.
  • the metering vessel 13 conveys powder, for example consisting of U / Pu mixed oxide, supplied via the conveying path 16 into the process container 2.
  • the safety device 31 sums up in a component memory associated with this conveying path 16 and in the total memory also the masses of this into the process container 2 U / Pu mixed oxide powder conveyed in portions and deposits the measured masses.
  • the safety device 31 finally blocks the conveying path 16 again by keeping the switching device 37 open when the sum of the masses of the U / Pu mixed oxide powder conveyed via the conveying path 16 reaches a predetermined limit value.
  • the safety device 31 also blocks the conveying device 12 by opening the switching devices 36 and 37 when the sum of the powder masses filled in the process container 2 reaches a predetermined limit value.
  • the process container 2 is pivoted through 90 ° about the axis determined by the bearing 3 and the process, e.g. Grinding or mixing of the powder in the process container carried out.
  • the process container 2 is pivoted about the axis determined by the bearing 3 by a further 90 ° and is docked with the filler neck 5 to the hopper 24 of the receptacle 23.
  • the closure body 6 has been brought back into the emptying position with the vertical passage channel 7, the powder trickles out of the process container 2 into the receiving container 23.
  • closure body 6 is brought back into the closed position and the process container 2 is pivoted about the axis determined by the bearing 3 into the starting position shown in FIG.
  • the detection device 21 for emptying the process container 2 had previously given a signal to the input of the safety device 31, and this safety device 31 compares the mass of the powder located in the receptacle 23 with the scale 22 with the mass stored in the total memory of the safety device 31. It opens the switching devices 36 and 37 blocking the conveying device 12 when the one measured in the receptacle 23 Powder mass differs from the sum of the powder masses of the individual portions conveyed into the process container 2 with the metering vessel 13 by a predetermined value or more.
  • the process container 2 can be filled several times and emptied several times into the receiving container 23.
  • the safety device 31 opens the switching device 35 by blocking the swivel motor 4 when either the powder mass measured by the scale 22 in the receptacle 23 reaches or exceeds a predetermined limit value or when the signals from the detection device 21 for emptying the process container 2 from the safety device 31 counted empties of the process container 2 in the receiving container 23 reaches a predetermined value.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)

Claims (6)

  1. Dispositif de traitement mécanique de poudre, notamment de poudre de combustible nucléaire, dans un récipient de traitement (2), notamment dans un broyeur ou dans un mélangeur, comportant un vase doseur (13) associé au récipient de traitement (2), un dispositif (12) de transport de poudre, qui débouche dans le vase doseur (13), et un récipient de stockage (23), dans lequel peut être vidé le récipient de traitement (2),
    caractérisé par le fait
    a) qu'une première balance (8) est associée au vase doseur (13), qui est pourvu d'une ouverture de vidange (13b) pouvant être fermée et pouvant être guidée dans le récipient de traitement,
    b) qu'une seconde balance (22) est associée au récipient de stockage (23),
    c) qu'à la première balance (8) est associé un premier dispositif d'identification (19) servant à identifier l'état prêt pour la pesée de la première balance (8),
    d) qu'au vase doseur (13) est associé un second dispositif d'identification (18), qui identifie l'état fermé de l'ouverture de vidange (13b),
    e) qu'il est prévu un dispositif de sécurité (31), qui est raccordé, par son entrée du signal, à la première balance (8) et à la seconde balance (22) ainsi qu'au premier dispositif d'identification (19) et au second dispositif d'identification (18), et qui est raccordé par sa sortie du signal, au dispositif (12) de transport de poudre,
    f) que le dispositif de sécurité (31) exploite la masse de poudre mesurée par la première balance (8) lorsque simultanément le premier dispositif d'identification (19) indique l'état prêt pour la pesée et lorsque le second dispositif d'identification (18) indique que l'ouverture de vidange est fermée,
    g) que le dispositif de sécurité (31) additionne les masses de poudre mesurées par la première balance (8) et envoyées sous la forme de portions individuelles du vase doseur (13) au récipient de traitement (2), et
    h) que le dispositif de sécurité (31) bloque le dispositif de transport (12), lorsque la somme des masses de poudre des portions individuelles envoyées hors du vase doseur (13), atteint une première valeur limite prescrite ou lorsque la masse de poudre, mesurée par la seconde balance (22) après que le récipient de traitement (2) a été vidé dans le récipient de stockage (23), diffère, d'une valeur prescrite ou de plus, de la somme des masses de poudre des portions individuelles envoyées dans le récipient de traitement (2).
  2. Dispositif suivant la revendication 1,
    caractérisé par le fait
    que le dispositif (12) de transport de poudre comporte au moins deux voies de transport (15 et 16),
    qu'au dispositif (12) de transport de poudre est associé un troisième dispositif d'identification (39a; 40a), qui identifie le trajet d'envoi allant au vase doseur,
    que le dispositif de sécurité (31) est raccordé, par son entrée de signal, au troisième dispositif d'identification (39a; 40a) et, par sa sortie de signal, au dispositif (12) de transport de poudre, et
    que pour un premier trajet d'envoi (15) allant au vase doseur (13), le dispositif de sécurité (31) bloque un second trajet d'envoi (7) aboutissant au vase doseur (13), lorsque le premier trajet d'envoi (15) est autorisé, ou bloque le premier trajet d'envoi (15) ou l'ensemble du dispositif de transport (12), lorsque le premier trajet d'envoi (15) n'est pas autorisé.
  3. Dispositif suivant la revendication 2,
    caractérisé par le fait que le dispositif de sécurité (31) supprime le blocage du second trajet d'envoi (16) lorsque la somme des masses de poudre, envoyées par l'intermédiaire du premier trajet d'envoi (15), au récipient de traitement (2), atteint ou dépasse une seconde valeur de seuil prescrite inférieure à la première valeur limite.
  4. Dispositif suivant la revendication 3,
    caractérisé par le fait que le dispositif de sécurité (31) bloque à nouveau le second trajet d'envoi (16), lorsque la somme des masses de poudre, qui sont envoyées au récipient de traitement (2) par l'intermédiaire du second trajet d'envoi (16), atteint une troisième valeur limite prescrite inférieure à la première valeur limite.
  5. Dispositif suivant la revendication 1,
    caractérisé par le fait que le dispositif de sécurité (31) est raccordé, par sa sortie de signal, à un dispositif (35), qui empêche le récipient de traitement (2) de se vider dans le récipient de stockage (23), lorsque la masse de poudre mesurée par la seconde balance (22) et située dans le récipient de stockage (23) atteint une quatrième valeur limite prescrite.
  6. Dispositif suivant la revendication 1,
    caractérisé par le fait que le dispositif de sécurité (31) est raccordé, par son entrée de signal, à un dispositif d'identification (21) servant à identifier le nombre de fois ou le récipient de traitement (2) s'est vidé dans le récipient de stockage (23) et, par sa sortie de signal, à un dispositif, qui empêche le récipient de traitement (2) de se vider dans le récipient de stockage (23), lorsque ce nombre de fois à atteint une valeur prescrite.
EP92114423A 1991-09-06 1992-08-24 Dispositif pour le traitement méchanique de poudres en particulier de poudres combustibles des centrales nucléaires Expired - Lifetime EP0530636B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4129652 1991-09-06
DE4129652A DE4129652A1 (de) 1991-09-06 1991-09-06 Einrichtung zum mechanischen bearbeiten von pulver, insbesondere kernbrennstoffpulver

Publications (2)

Publication Number Publication Date
EP0530636A1 EP0530636A1 (fr) 1993-03-10
EP0530636B1 true EP0530636B1 (fr) 1995-06-21

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ID=6440004

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92114423A Expired - Lifetime EP0530636B1 (fr) 1991-09-06 1992-08-24 Dispositif pour le traitement méchanique de poudres en particulier de poudres combustibles des centrales nucléaires

Country Status (3)

Country Link
EP (1) EP0530636B1 (fr)
JP (1) JP3129852B2 (fr)
DE (2) DE4129652A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007144414A1 (fr) * 2006-06-15 2007-12-21 Belgonucleaire Sa dispositifs de prévention de criticité et procédés de production de combustible nucléaire
CN104526861A (zh) * 2014-12-23 2015-04-22 江苏金石研磨有限公司 一种陶瓷滚动成型自动加料加水***

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2073652A (en) * 1936-03-12 1937-03-16 John F Robb Central mixing plant
DE1683758A1 (de) * 1967-05-03 1971-09-09 Atlas Mak Maschb Gmbh Vorrichtung zur Zufuehrung von Sand und Kalk zu einem Vormischer fuer die Kalksandsteinherstellung
DE2034837C3 (de) * 1970-07-14 1973-12-06 Bruno Meyer Spezialmaschinen- Und Wiegeapparatebau Gmbh, 5202 Hennef Vorrichtung für die diskontinuier liehe Herstellung von Mischungen aus feinst bis grobkörnigen Schüttgütern
DE2247518C3 (de) * 1972-09-28 1975-04-30 Werner & Pfleiderer, 7000 Stuttgart Mischer
DE3834191A1 (de) * 1988-10-07 1990-04-12 Brockhues Chem Werke Ag Vorrichtung und verfahren zum automatischen dosieren trockener pigmente in einen beton- oder moertelmischer

Also Published As

Publication number Publication date
JPH05249285A (ja) 1993-09-28
JP3129852B2 (ja) 2001-01-31
DE59202600D1 (de) 1995-07-27
EP0530636A1 (fr) 1993-03-10
DE4129652A1 (de) 1993-03-11

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