EP1277513A1 - Vorrichtung zum Homogenisieren von Pulver, deren Verwendung und ein Verfahren unter Verwendung einer derartigen Vorrichtung - Google Patents

Vorrichtung zum Homogenisieren von Pulver, deren Verwendung und ein Verfahren unter Verwendung einer derartigen Vorrichtung Download PDF

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Publication number
EP1277513A1
EP1277513A1 EP02291785A EP02291785A EP1277513A1 EP 1277513 A1 EP1277513 A1 EP 1277513A1 EP 02291785 A EP02291785 A EP 02291785A EP 02291785 A EP02291785 A EP 02291785A EP 1277513 A1 EP1277513 A1 EP 1277513A1
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EP
European Patent Office
Prior art keywords
powder
drum
orifice
external
cylindrical
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.)
Granted
Application number
EP02291785A
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English (en)
French (fr)
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EP1277513B1 (de
Inventor
Gérard Bertolotti
Christian Orange
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.)
Orano Demantelement SAS
Original Assignee
Compagnie Generale des Matieres Nucleaires 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
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Publication of EP1277513A1 publication Critical patent/EP1277513A1/de
Application granted granted Critical
Publication of EP1277513B1 publication Critical patent/EP1277513B1/de
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
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/74—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with rotary cylinders
    • 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
    • B01F35/90—Heating or cooling systems
    • B01F35/92—Heating or cooling systems for heating the outside of the receptacle, e.g. heated jackets or burners
    • 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
    • B01F35/90—Heating or cooling systems
    • B01F35/95—Heating or cooling systems using heated or cooled stirrers

Definitions

  • the present invention relates to a homogenization device powder, its use and a homogenization process using such a device.
  • the present invention relates to a powder homogenization device specially adapted for a noxious powder releasing heat, in particular a radioactive powder, such as plutonium oxide or more particularly dioxide plutonium (PuO 2 ).
  • a radioactive powder such as plutonium oxide or more particularly dioxide plutonium (PuO 2 ).
  • Such a homogenization device must both respect the homogeneity, particle size and isotopic composition constraints powder, while avoiding the formation of segregations, and evacuating the thermal emissions inherent in the harmful powder and its brewing.
  • Powder homogenization devices offered up to today do not allow to respond effectively to all of these conditions.
  • this solution uses a system of internal cooling of the homogenization device and of the powder it contains.
  • this solution allows homogenize by mixing the powder contained in the annular space formed between the cylindrical wall of the outer drum mobile and the ferrule of the fixed body.
  • the cooling of the powder is made possible by the presence of cold air inside the space of revolution delimited between the external drum and the internal drum, which generates a large heat exchange surface (the entire surface of the cylindrical wall of the external drum) between the cold air and the powder.
  • axial half means the internal drum or external drum, one of the two parts (or first longitudinal half drum) of this drum separated from the other part (or second longitudinal half drum) by a transverse plane orthogonal to the longitudinal or axial direction (X, X ') of the drum, this transverse plane being located at half the length of the drum concerned.
  • this transverse plane is that which passes by the axes (Y, Y ') and (Z, Z').
  • said blades are helical and form a no reverse screw between each axial half of the external drum.
  • each axial half of the external drum is covered, on its external face, a helical internal blade attached to said external face all along of said axial half and of a helical outer blade spaced from said external face all along said axial half, said internal blades and external having between them, on each axial half of the wall cylindrical, an inverted screw thread.
  • said ferrule is formed, at least in its lower part, of a double-walled waterproof envelope in which is likely to circulate cooled air from a system supply of cooled air.
  • said enclosure is fitted with fins arranged on the face of the wall upper of said envelope facing inward of said envelope.
  • the present invention also relates to the use of the powder homogenization device of the aforementioned type, the device being placed in a glove box, said powder being radioactive and preferably consisting of plutonium dioxide (PuO 2 ).
  • the powder homogenization device 10 comprises essentially a fixed cylindrical body 14 containing an assembly 16 cylindrical drums movable in rotation and a shaft 18 arranged according to the direction of the longitudinal axis (XX ') of the body 14 and of the assembly of drums 16.
  • the body 14 is composed of a cylindrical shell 14a delimiting a cylindrical volume of circular section sealed by two disc-shaped flanges 14b arranged at the two ends of the ferrule 14a.
  • the drum assembly 16 is mounted coaxially by relative to the body 14 around the shaft 18 to which it is integral. So, the shaft 18 passes longitudinally through the body 14 while being rotatably mounted by relative to this body 14 thanks to two bearings 20 mounted respectively at front and rear of the body 14 on the external face of the flanges 14b (see Figures 1A and 1B).
  • the set of drums 16 disposed inside the body 14 is consists of an external drum and an internal drum coaxial between them around the axis (X, X ') and which are mounted integrally on tree 18.
  • the external drum consists of a cylindrical wall 16a, having a diameter smaller than that of the ferrule 14a, and of two walls 16b in the form of a disc, the length of the cylindrical wall 16a being substantially lower than that of the shell 14a along the axis (X, X ').
  • the internal drum placed inside the external drum, is consists of a cylindrical wall 16c, having a diameter less than that of the cylindrical wall 16a of the external drum, and of two walls 16d in the form of a disc, the length of the cylindrical wall 16c being lower than that of the cylindrical wall 16a along the axis (X, X ').
  • This space of revolution comprises a longitudinal zone 16th, located between the wall cylindrical 16a of the outer drum and the cylindrical wall 16c of the drum internal, and two radial zones 16 f, located between one of the walls 16b in disc shape of the outer drum and the disc-shaped wall 16d internal drum.
  • Each radial zone 16f has a disc shape surrounding the shaft 18, this radial zone 16f being more thick in the vicinity of the tree by defining an enlarged area 16g.
  • the outer face of the cylindrical wall 16a of the drum outer is covered with helical blades 22a, 22b intended to brew and mix the powder contained in an annular space 24 delimited between this cylindrical wall 16a and the ferrule 14a, in order to homogenize this powder.
  • Each axial half of the cylindrical wall 16a of the drum external (to the right and to the left of direction II-II in FIG. 1) is provided an helical internal blade 22a extending integrally over 180 ° being attached all along the outside of the axial half of the cylindrical wall 16a of the external drum.
  • the right axial half of the cylindrical wall 16a of the external drum is equipped with a first blade internal helical 22a forming a screw thread turning to the left, while that the left axial half of the cylindrical wall 16a of the drum external is equipped with a second internal helical blade 22a forming a screw thread turning to the right.
  • the first internal blade 22a and the second internal blade 22a are located diametrically opposite (respectively at the rear and at the front of the set of drums 16 in FIG. 1) and on longitudinal or axial halves different from the outer face of the cylindrical wall 16a of the drum external (respectively to the right and left of the plane passing through the axes (Y, Y ') and (Z, Z') in Figure 1).
  • Each of the two internal blades 22a extends over the entire length and half the circumference of a axial half of the cylindrical wall 16a of the outer drum.
  • Each axial half of the cylindrical wall 16a of the drum external (right and left of direction II-II in figure 1) is also provided with an external helical blade 22b extending from integral 360 ° along the outside of the half axial of the cylindrical wall 16a of the external drum.
  • These external blades 22b are spaced from the outer face of the outer drum to create a powder passage between them and the cylindrical wall 16a.
  • the blades 22b are substantially tangent to the ferrule 14a so as to scrape the face of the wall of the ferrule 14a facing inward.
  • the first external blade 22b and the second blade external 22b are located on longitudinal or axial halves different from the outer face of the cylindrical wall 16a of the drum external (respectively to the right and left of the plane passing through the axes (Y, Y ') and (Z, Z') in Figure 1) being arranged one with respect to the other symmetrically around the point of intersection of the axes (Y, Y ') and (Z, Z').
  • Each of the two outer blades 22b extends over the entire length and around the entire circumference of an axial half of the wall cylindrical 16a of the outer drum.
  • the distance separating each outer blade from the outer face of the cylindrical wall 16a of the external drum is greater than the width (in the radial direction) internal blades 22a.
  • the internal blades 22a and external blades 22b have a width, in the radial direction, substantially identical.
  • the internal blades 22a are shorter than the blades external 22b if we consider their length distributed so helical along the outer face of the cylindrical wall 16a of the external drum from one end to the middle of the wall cylindrical 16a.
  • the direction of rotation of the drum assembly 16 is such that the internal blades 22a direct the powder contained in the annular space 24 towards the flanges 14b, i.e. towards the ends of the body 14.
  • the external blades 22b bring the powder contained in the space annular 24 towards the diametrical plane of symmetry of the body 14 passing through the axes (Y, Y ') and (Z, Z'), that is to say in the direction of the center of the body 14.
  • This action has the advantage of making it possible to easily empty all the powder contained in the annular space 24 during emptying.
  • a scraper device is disposed between each flange 14b of the cylindrical body 14 and the disk-shaped wall 16b to prevent the deposition of powder in this area.
  • This scraper device is mobile and is advantageously constituted by at at least one radial blade 26 mounted integrally on the face outer on each of the two disc-shaped walls 16b.
  • the cylindrical body 14 also includes several openings: a filling orifice 14c, a drainage orifice 14d, a degassing port 14i, an inlet port for cooling air 14e, an outlet for cooling air 14f and ports for tree passage 14g and 14h.
  • said opening is opened degassing 14i to "breathe” the homogenization device 10.
  • the seal between the space ring 24 and the interior of the glove box 12 is obtained using a sealing system which comprises at least one cable gland and, preferably braids in contact with the shaft 18 of the assembly drums 16.
  • a sealing system which comprises at least one cable gland and, preferably braids in contact with the shaft 18 of the assembly drums 16.
  • Each bearing 20 ensures the rotation of the shaft 18 and the drum which is attached to it by means of bearings, preferably rolls.
  • the powder feed from the upstream device to the powder homogenization device 10 is carried out by a chute supply 28 disposed between the opening 12a of the glove box and the filling orifice 14c.
  • the orifice of filling 14c is connected to the powder supply chute 28 which communicates with an upstream device.
  • An isolation valve 30 disposed in the chute supply 28, near the filling orifice 14c, allows open or close the powder passage from the upstream device to the homogenization device 10.
  • an outlet chute 32 is disposed from the drain port 14d at less until opening 12b of the glove box.
  • drain port 14d is connected to the outlet chute of powder 32 which is equipped with at least one system, forming a valve, in order to ability to close or open powder passage from device homogenization 10 to a downstream device communicating with the powder outlet chute 32.
  • valve systems are provided to control and regulate the outlet of powder outside the homogenization device 10.
  • the valve system firstly comprises a flap hatch 34 controlled by jacks 36.
  • the device homogenization further comprises, downstream of the flap hatch 34, an isolation valve 38 fitted to the powder outlet chute 32.
  • This isolation valve 38 makes it possible to separate the device homogenization 10 of the downstream device while, under the control cylinders 36, the opening of the hatch 34 makes it possible to limit the flow of emptying the homogenization device 10.
  • the shutters of the hatch 34 are located in the extension of the bottom wall of the shell 14a which delimits the annular space 24, which avoids the formation of a corner where the powder could become lodged.
  • the homogenization device 10 comprises, between the shutter flap 34 and the isolation valve 38, a cellular valve 40 (see Figure 2) to change the flow rate of powder flowing through the outlet chute 32 to the downstream device.
  • the internal cooling system has a system of cooled air supply with a cooled air inlet pipe 42 mounted on a rotary joint 44.
  • the rotary joint 44 is itself arranged outside the cylindrical body 14 around a first portion end 18a of the shaft 18 so that said inlet pipe 42 communicates with a first longitudinal channel 18c extending longitudinally throughout the first end portion 18a of the shaft 18 from outside the body 14 to the space 16th, 16f delimited between the outer drum and the inner drum.
  • the rotary joint 44 has an interior space annular 44a (see Figure 3) in fluid communication on the one hand with the inlet pipe 42 and on the other hand, at at least one inlet orifice 18th, with said first channel 18c.
  • the illustrated embodiment has two 18th inlet ports.
  • the first end portion 18a of the shaft is equipped, in the part located in the enlarged zone 16g of the radial zone 16f, at least one supply port 18f.
  • the shaft 18 has a second end portion 18b also digs at the site of a second longitudinal channel 18d.
  • the first longitudinal channel 18c and the second longitudinal channel 18d do not communicate with each other at tree level 18.
  • the air is exhausted by the second 18d channel thanks to at least one 18g evacuation orifice located at the level of the second end portion 18b of the shaft 18.
  • 18g evacuation orifice located at the level of the second end portion 18b of the shaft 18.
  • FIG. 1B and in the left part of Figures 1 and 3 there are four holes evacuation 18g.
  • These 18g orifices are in fluid communication with a part with the second channel 18d and, on the other hand, with the interior of the space 16e, 16f delimited between the external drum and the internal drum, at the level of the enlarged zone 16g of the radial zone 16f.
  • the second channel 18d extends at least until the opening 12d of the glove box so that the air is evacuated, and possibly recycled, in a high vacuum ventilation system.
  • the ferrule 14a is surrounded by a bottom wall 46a thus delimiting an envelope 46 with double wall.
  • This envelope 46 is connected to another supply system in cooled air, on the one hand by an inlet duct 46b disposed at a first end of the envelope 46 which is located on the side of the second end portion 18b of the shaft, and on the other hand by a conduit outlet 46c disposed at the second end of the envelope which is located on the side of the first end portion 18a of the shaft.
  • the upper part of the shell 14a is consisting of a single shell while the lower part of the shell 14a consists of the double envelope 46.
  • the space delimited by the external face of the wall of the ferrule 14a and through the internal face of the wall lower 46a of the double jacket 46 is provided with fins 48 for promote heat exchange (see Figures 2 and 3).
  • the fins 48 are located against the wall 14a of the envelope. In the case of the embodiment shown, the fins 48 extend parallel to the axis (X, X ') of rotation of the drum assembly 16.
  • the inlet and outlet conduits 46b and 46c are connected to a cooling system 50 which is external to the glove box 12 (see figure 3).
  • This air cooling system 50 includes a fan 52 and a finned exchanger 54 cooled by a circulation of chilled water 56. This system 50 makes it possible to cool the air leaving through the outlet duct. 46c from a temperature of around 50 ° C to a temperature of around 25 ° C, the air being sent by the fan 52 at the level of the duct input 46b.
  • the space 16th, 16f delimited between the drum external and the internal drum is equipped with fins 17 as can be see in particular in Figures 2 and 3.
  • these fins 17 are located on the internal face of the wall cylindrical 16a and parallel to the axis (X, X ') of the internal drums and external.
  • the upper part of the body 14 includes the degassing orifice 14i connected to a tube leading to a solenoid valve fitted with a filter which allows the device to "breathe” homogenization 10 during the emptying phase. Indeed, in this case, it allows the admission of air from the enclosure formed from the box to gloves 12.
  • the homogenization device 10 preferably also includes a vibration system arranged to the exterior of the cylindrical body 14 near the drain orifice 14d.
  • a vibration system arranged to the exterior of the cylindrical body 14 near the drain orifice 14d.
  • a set of four hammers 58 is disposed against the casing 46, on the external face from the bottom wall 46a, equidistant all around the chute 32.
  • These pneumatic hammers send vibrations to envelope 46: these vibrations take off the powder from the shell walls 14a and favor the emptying of the homogenization device 10. It is understood that this vibratory system could just as easily be arranged directly in contact with the ferrule 14a.
  • annular space 24 provision is made for the geometry of the annular space 24 to ensure the criticality safety of the device during the homogenization of a certain charge of plutonium (di) oxide powder PuO 2 .
  • the plutonium oxide from the upstream cycle is received by gravity in the homogenization device, in the annular space 24 above.
  • the isolation valve 30 located in the feed chute 28 is open, hatch 34 and isolation valve 38 located in the outlet chute 32 are closed.
  • the isolation valve 30 is closed and then opened the degassing orifice 14i to make the device "breathe” homogenization 10 during the homogenization phase.
  • the isolation valve 30 of the feed chute 28 being maintained closed, the flap hatch 34 and the isolation valve 38 of the outlet chute 32, while the honeycomb valve 40 is used to adjust the powder discharge rate.
  • the solenoid valve, and its associated filter allow the air intake of the body 14 from the enclosure formed from the glove box 12.
  • the degree of opening of the flap hatch 34, the speed of rotation of the drum assembly 16 and the speed of rotation of the alveolar valve 40 allows to adjust the instant powder flow to the downstream device.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Accessories For Mixers (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
EP02291785A 2001-07-20 2002-07-16 Vorrichtung zum Homogenisieren von Pulver, deren Verwendung und ein Verfahren unter Verwendung einer derartigen Vorrichtung Expired - Lifetime EP1277513B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0109709A FR2827524B1 (fr) 2001-07-20 2001-07-20 Dispositif d'homogeneisation de poudre,son utilisation et un procede d'homogeneisation utilisant un tel dispositif
FR0109709 2001-07-20

Publications (2)

Publication Number Publication Date
EP1277513A1 true EP1277513A1 (de) 2003-01-22
EP1277513B1 EP1277513B1 (de) 2008-01-02

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EP02291785A Expired - Lifetime EP1277513B1 (de) 2001-07-20 2002-07-16 Vorrichtung zum Homogenisieren von Pulver, deren Verwendung und ein Verfahren unter Verwendung einer derartigen Vorrichtung

Country Status (6)

Country Link
US (1) US6803017B2 (de)
EP (1) EP1277513B1 (de)
JP (1) JP4711594B2 (de)
DE (1) DE60224331T2 (de)
FR (1) FR2827524B1 (de)
RU (1) RU2291741C2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
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CN105457522B (zh) * 2016-01-08 2018-01-12 浙江骏驰纸制品有限公司 一种卧式搅拌器
CN105435673B (zh) * 2016-01-08 2018-02-27 河南小威环境科技有限公司 一种卧式搅拌器用拆分式搅拌轴

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NZ568435A (en) * 2005-12-05 2011-02-25 Gordon Craig Boots Method and apparatus for processing of materials with bearings supporting rotating drum being sealed from heat and pressure added in interstitial space
US20150316312A1 (en) * 2008-07-14 2015-11-05 Ecotech Recycling Ltd. Device and method for cooling solid particles
CN102397761B (zh) * 2011-09-13 2013-07-03 宁波市鄞州千峰机械科技有限公司 蒸汽涡流式硝酸铵溶解器
CN103100707B (zh) * 2011-11-11 2015-04-15 沈阳铝镁设计研究院有限公司 海绵钛中和机
ITPD20120180A1 (it) * 2012-06-05 2013-12-06 Cer Group S R L Agitatore per la stabilizzazione di semilavorati leganti liquidi destinati alla composizione di articoli ceramici
RU2548187C1 (ru) * 2013-12-24 2015-04-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Кубанский государственный аграрный университет" Вибрационная установка для смешивания сыпучих материалов
DE102015105804A1 (de) 2015-04-16 2016-10-20 Netzsch-Feinmahltechnik Gmbh Rührwerkskugelmühle
CN106531260B (zh) * 2016-11-25 2018-07-27 中核建中核燃料元件有限公司 一种燃料棒端塞压塞机及使用方法
CN111077393B (zh) * 2019-12-24 2022-03-01 广东电网有限责任公司 一种模拟开关器
CN112549511B (zh) * 2020-11-24 2022-09-06 宣城市泳达洁具有限公司 一种浴缸生产用冷却脱模装置

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JPH09239253A (ja) * 1996-03-07 1997-09-16 Fuji Photo Film Co Ltd 分散装置
JPH11109089A (ja) * 1997-09-30 1999-04-23 Kakunenryo Cycle Kaihatsu Kiko 攪拌冷却式ウラン・プルトニウム混合酸化物粉末用貯槽
JPH11109088A (ja) * 1997-09-30 1999-04-23 Kakunenryo Cycle Kaihatsu Kiko 中空冷却式ウラン・プルトニウム混合酸化物粉末用貯槽
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105457522B (zh) * 2016-01-08 2018-01-12 浙江骏驰纸制品有限公司 一种卧式搅拌器
CN105435673B (zh) * 2016-01-08 2018-02-27 河南小威环境科技有限公司 一种卧式搅拌器用拆分式搅拌轴

Also Published As

Publication number Publication date
FR2827524A1 (fr) 2003-01-24
US20030030194A1 (en) 2003-02-13
JP2003098292A (ja) 2003-04-03
RU2291741C2 (ru) 2007-01-20
EP1277513B1 (de) 2008-01-02
DE60224331T2 (de) 2009-01-02
US6803017B2 (en) 2004-10-12
DE60224331D1 (de) 2008-02-14
JP4711594B2 (ja) 2011-06-29
FR2827524B1 (fr) 2003-09-19

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