US3871626A - Vessel for pneumatically mixing powdered or granular material - Google Patents

Vessel for pneumatically mixing powdered or granular material Download PDF

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Publication number
US3871626A
US3871626A US348419A US34841973A US3871626A US 3871626 A US3871626 A US 3871626A US 348419 A US348419 A US 348419A US 34841973 A US34841973 A US 34841973A US 3871626 A US3871626 A US 3871626A
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US
United States
Prior art keywords
vessel
tube
annular channel
lower tube
elevating
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Expired - Lifetime
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US348419A
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English (en)
Inventor
Arnon Wohlfarth
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Bayer AG
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Bayer AG
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Publication date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
    • B01J8/24—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique
    • B01J8/38—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique with fluidised bed containing a rotatable device or being subject to rotation or to a circulatory movement, i.e. leaving a vessel and subsequently re-entering it
    • B01J8/384—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique with fluidised bed containing a rotatable device or being subject to rotation or to a circulatory movement, i.e. leaving a vessel and subsequently re-entering it being subject to a circulatory movement only
    • B01J8/386—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique with fluidised bed containing a rotatable device or being subject to rotation or to a circulatory movement, i.e. leaving a vessel and subsequently re-entering it being subject to a circulatory movement only internally, i.e. the particles rotate within the vessel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/40—Mixers using gas or liquid agitation, e.g. with air supply tubes
    • B01F33/405—Mixers using gas or liquid agitation, e.g. with air supply tubes in receptacles having guiding conduits therein, e.g. for feeding the gas to the bottom of the receptacle
    • B01F33/4051—Mixers using gas or liquid agitation, e.g. with air supply tubes in receptacles having guiding conduits therein, e.g. for feeding the gas to the bottom of the receptacle with vertical conduits through which the material is being moved upwardly driven by the fluid
    • B01F33/40511—Mixers using gas or liquid agitation, e.g. with air supply tubes in receptacles having guiding conduits therein, e.g. for feeding the gas to the bottom of the receptacle with vertical conduits through which the material is being moved upwardly driven by the fluid with a central conduit or a central set of conduits

Definitions

  • the present invention relates to a vessel for pneumatically mixing powdered or granular material.
  • a vessel for pneumatically mixing powdered or granular material comprising a conical base with a bottom outlet and a gas inlet situated therein and above which an elevating tube is arranged which terminates in the upper part of the vessel and which is divided into at least two separate tubes, the upper end of the lower tube being widened in the upward direction and sur' rounding the lower end of the upper tube leaving an annular channel therebetween, the lower tube forming a second annular channel with the wall of the vessel the second annular channel being adapted so that in use the drop in pressure over the length of the elevating tube is at least substantiallythe same as the drop in pressure over the length of the annular channel.
  • the lower tube is in the form of a displacement body.
  • the annular channel required between the wall of the vessel and the lower tube can be adjusted to meet particular requirements.
  • the wall of the vessel in the vicinity of the lower individual tube approimates the contour of the lower individual tube.
  • the effective length of the annular channel, the so-called braking zone determines the required pressure drop.
  • the inlet of the upper tube which is arranged above the lower tube preferably extends down to a point near the inlet of the lower tube.
  • the present embodiment has the advantage that only a small plug which can be broken up with relatively little energy is formed when the mixer is started. It is sufficient for this purpose to use a fan whose output is adapted to the mixing operation. In the previous embodiment, the fan had to be designed to provide a relatively high pressure because more energy was required for the starting of the mixer than in its normal operation.
  • the cross-section of the second annular channel is selected so that a given proportion of the total quantity of air is passed therethrough in such a way that the loosening speed is not exceeded.
  • the loosening speed is the rate of air flow which is required to fluidise the material to be mixed.
  • the quantity of air passed through the second annular channel is referred to as the so-called false-air quantity.
  • This quantity is normally so large as to be disadvantageous because it causes an excessive air requirement.
  • the loosening rate should not be exceeded because otherwise the material flows too quickly towards the bottom outlet.
  • FIG. 1 is a section through a mixing vessel with a lower tube in the form of a displacement body.
  • FIG. 2 is a section through a mixing vessel with a wall adapted to the contour of the lower tube.
  • the mixer shown in FIG. 1 consists of a cylindrical vessel 1 with a conical base 2 and a removable cover 3.
  • An elevating tube which consists of a conical lower tube 4, in the form ofa displacement body, and a cylindrical upper tube 5, is fixed in the vessel 1, by means of stays 7a and 7b.
  • the two separate tubes 4 and 5 of the elevating tube are fitted into one another with an annular channel 6 therebetween.
  • the tube 5 is provided with radially arranged spacer ribs 9 for centring it in the conically widened lower tube 4.
  • the lower tube 4 forms a second annular channel 8 in the vicinity of the conical base 2.
  • the length of this annular channel 8 which is effective as the braking zone is denoted by the reference A.
  • the pressure drop in the braking zone A corresponds to the pressure drop from the inlet of the: elevating tube to its outlet.
  • this embodiment of the mixing vessel corresponds to that of the Parent Application.
  • the mixer illustrated in FIG. 2 consists of a cylindrical vessel 1 with a conical base 2 which is divided into differently tapering sections 2a, 2b and 2c.
  • the vessel 1 has a removable cover 3'.
  • An elevating tube which consists of a conical lower tube 4 and of a cylindrical upper tube 5' is fixed in the vessel 1 by means of stays 7a and 7b.
  • the two separate tubes 4' and 5 of the elevating tube are fitted into one another with an annular channel 6 therebetween.
  • the upper tube 5 is provided with spacer ribs 9' welded radially on to it for centring it in the conically widened tube 4.
  • the cross-section of the annular channel 8, 8 is constant over the effective braking zone A, A. By selecting the cross-section, it is possible to determine how much of the quantity of gas supplied is to pass through the annular channel 8, 8.
  • the mixer shown in FIG. 1 has a capacity of 50
  • the material to be mixed has a grain size of 3 X 3 X 3 mm, and a specific gravity of 1,100 kg/m.
  • the elevating tube is metres tall.
  • the total quantity of air supplied amounts to 7,800 m /hour, of which 800 m lhour pass through the annular channel 8 as so-called false air.
  • the effective braking zone A is 1.7 metres long.
  • the loosening rate of the air in the case of the aforementioned material to be mixed amounts to 2.25 m/second and should not be exceeded. Accordingly, a loosening rate of 0.8 m/second was selected. Under these conditions the annular channel has a cross-sectional area of 0.28 m
  • EXAMPLE 2 The mixer has the same parameters and is operated under the same conditions as in Example 1, but is in the form of the embodiment shown in FIG. 2. For a required quantity of false air of 800 m /hour, the freecross-section of the annular channel 8 also amounts to 0.28 m in this case.
  • a vessel for pneumatically mixing powdered or granular material comprising a conical base with a bottom outlet and a gas inlet situated therein and within which an elevating tube is mounted, which terminates in the upper part of the vessel and which comprises an upper tube and a lower tube, an upper end portion of the lower tube being widened in the upward direction and surrounding the lower end of the upper tube leaving an annular channel therebetween, the lower tube forming a second annular channel with the wall of the vessel, the second annular channel having a cross sectional area such that in use the drop in pressure over the length of the elevating tube is at least substantially the same as the drop in pressure over the length of the second ann'ular channel.
  • a vessel according to claim 1 wherein the wall of the vessel follows the contour of the lower tube in the vicinity thereof.
  • a vessel according to claim 1 wherein for a required proportion of the total quantity of air to be passed through the second annular channel of the cross-section of this annular channel is selected in such a way that the loosening rate is not exceeded.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Organic Chemistry (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
  • Accessories For Mixers (AREA)
  • Air Transport Of Granular Materials (AREA)
US348419A 1972-04-20 1973-04-05 Vessel for pneumatically mixing powdered or granular material Expired - Lifetime US3871626A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2219397A DE2219397C3 (de) 1972-04-20 1972-04-20 Behälter zum pneumatischen Mischen von pulvrigem oder körnigem Gut

Publications (1)

Publication Number Publication Date
US3871626A true US3871626A (en) 1975-03-18

Family

ID=5842726

Family Applications (1)

Application Number Title Priority Date Filing Date
US348419A Expired - Lifetime US3871626A (en) 1972-04-20 1973-04-05 Vessel for pneumatically mixing powdered or granular material

Country Status (7)

Country Link
US (1) US3871626A (de)
JP (1) JPS5426748B2 (de)
CH (1) CH561078A5 (de)
DE (1) DE2219397C3 (de)
FR (1) FR2181084B1 (de)
GB (1) GB1390750A (de)
IT (1) IT982306B (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4095776A (en) * 1975-10-07 1978-06-20 Azo-Maschinenfabrik Adolf Zimmermann Suction conveying and mixing apparatus
US4184774A (en) * 1977-06-18 1980-01-22 Claudius Peters, Ag. Silo for bulk material
US4185926A (en) * 1978-02-28 1980-01-29 Westinghouse Electric Corp. Safe-geometry pneumatic nuclear fuel powder blender
US4577972A (en) * 1980-10-15 1986-03-25 Westinghouse Electric Corp. Spouted bed blender apparatus
US4756624A (en) * 1986-06-20 1988-07-12 Waeschle Maschinenfabrik Gmbh Circulation mixer for bulk material
US5277492A (en) * 1992-05-08 1994-01-11 Fuller-Kovako Corporation Blender with internal mixing cone having an extension thereon
US5462351A (en) * 1994-06-20 1995-10-31 Jenike & Johanson, Inc. Conditioning vessel for bulk solids
US5826633A (en) * 1996-04-26 1998-10-27 Inhale Therapeutic Systems Powder filling systems, apparatus and methods
US6182712B1 (en) 1997-07-21 2001-02-06 Inhale Therapeutic Systems Power filling apparatus and methods for their use
US20040060265A1 (en) * 2002-06-27 2004-04-01 Nektar Therapeutics Controlling the flow of a powder
EP1533022A2 (de) * 2003-11-24 2005-05-25 Coperion Waeschle GmbH & Co. KG Mischsilo zum Lagern und Mischen rieselfähiger Feststoffe, insbesondere von Pulvern
US20080087111A1 (en) * 1999-12-17 2008-04-17 Normand Nantel Systems and methods for non-destructive mass sensing
US20110219952A1 (en) * 2008-11-26 2011-09-15 Univation Technologies, Llc Systems Using Mass Flow Promoting Insert with Gas Purging and Methods Thereof
USD882186S1 (en) * 2018-12-18 2020-04-21 Zaxe Technologies Inc. Automatic animal feeder

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3807705A (en) * 1972-06-28 1974-04-30 Du Pont Process and apparatus for solids blending
DE2539042B2 (de) * 1975-09-02 1980-07-24 Waeschle Maschinenfabrik Gmbh, 7980 Ravensburg Verfahren und Vorrichtung zur Temperaturbehandlung von oder zum Stoffaustausch bei Schüttgut
DE2742904C2 (de) * 1977-09-23 1983-08-11 Wäschle Maschinenfabrik GmbH, 7980 Ravensburg Vorrichtung zum pneumatischen Mischen von Schüttgut
DE3029393A1 (de) * 1980-08-01 1982-03-11 Waeschle Maschinenfabrik Gmbh, 7980 Ravensburg Schwerkraft-umwaelzmischer
DE3274195D1 (en) * 1982-09-24 1987-01-02 Chisso Corp Apparatus for granulation or coating
CA1211142A (en) * 1984-04-04 1986-09-09 Robert E. Romanchik Pneumatic conveying and material blending apparatus and method
JPH0824160B2 (ja) * 1985-10-03 1996-03-06 三菱電機株式会社 半導体装置の製造方法
DE4112884C2 (de) * 1991-04-19 1997-02-06 Waeschle Maschf Gmbh Mischsilo
DE4113851A1 (de) * 1991-04-27 1992-10-29 Avt Anlagen Verfahrenstech Vorrichtung zum kontinuierlichen mischen von pulverfoermigen oder grobkoernigen schuettguetern
HUE026139T2 (en) 2011-03-11 2016-05-30 Bayer Ip Gmbh Mixing silo
CN108993287A (zh) * 2018-07-20 2018-12-14 成都恩承科技股份有限公司 气动溶药装置及溶药方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1937374A1 (de) * 1969-07-23 1971-02-04 Bayer Ag Vorrichtung zum Mischen und Homogenisieren von Schuettgut und Verfahren zum Betrieb der Vorrichtung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1937374A1 (de) * 1969-07-23 1971-02-04 Bayer Ag Vorrichtung zum Mischen und Homogenisieren von Schuettgut und Verfahren zum Betrieb der Vorrichtung

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4095776A (en) * 1975-10-07 1978-06-20 Azo-Maschinenfabrik Adolf Zimmermann Suction conveying and mixing apparatus
US4184774A (en) * 1977-06-18 1980-01-22 Claudius Peters, Ag. Silo for bulk material
US4185926A (en) * 1978-02-28 1980-01-29 Westinghouse Electric Corp. Safe-geometry pneumatic nuclear fuel powder blender
US4577972A (en) * 1980-10-15 1986-03-25 Westinghouse Electric Corp. Spouted bed blender apparatus
US4756624A (en) * 1986-06-20 1988-07-12 Waeschle Maschinenfabrik Gmbh Circulation mixer for bulk material
US5277492A (en) * 1992-05-08 1994-01-11 Fuller-Kovako Corporation Blender with internal mixing cone having an extension thereon
US5462351A (en) * 1994-06-20 1995-10-31 Jenike & Johanson, Inc. Conditioning vessel for bulk solids
US7669617B2 (en) 1996-04-26 2010-03-02 Novartis Pharma Ag Powder filling systems, apparatus and methods
US7624771B2 (en) 1996-04-26 2009-12-01 Novartis Pharma Ag Powder filling systems, apparatus and methods
US6267155B1 (en) 1996-04-26 2001-07-31 Inhale Therapeutic Systems Inc. Powder filling systems, apparatus and methods
US6581650B2 (en) 1996-04-26 2003-06-24 Nektar Therapeutics Powder filling systems, apparatus and methods
US20040031536A1 (en) * 1996-04-26 2004-02-19 Parks Derrick J. Powder filling systems, apparatus and methods
US20050263206A1 (en) * 1996-04-26 2005-12-01 Parks Derrick J Powder filling systems, apparatus and methods
US5826633A (en) * 1996-04-26 1998-10-27 Inhale Therapeutic Systems Powder filling systems, apparatus and methods
US8783305B2 (en) 1997-07-21 2014-07-22 Novartis Ag Powder filling apparatus and methods for their use
USRE42942E1 (en) 1997-07-21 2011-11-22 Novartis Ag Powder filling apparatus and methods for their use
US6182712B1 (en) 1997-07-21 2001-02-06 Inhale Therapeutic Systems Power filling apparatus and methods for their use
US8061222B2 (en) 1999-12-17 2011-11-22 Novartis Ag Systems and methods for non-destructive mass sensing
US7552655B2 (en) 1999-12-17 2009-06-30 Novartis Pharma Ag Systems and methods for non-destructive mass sensing
US20090249898A1 (en) * 1999-12-17 2009-10-08 Novartis Pharma Ag Systems and methods for non-destructive mass sensing
US20080087111A1 (en) * 1999-12-17 2008-04-17 Normand Nantel Systems and methods for non-destructive mass sensing
US20040060265A1 (en) * 2002-06-27 2004-04-01 Nektar Therapeutics Controlling the flow of a powder
CN100344358C (zh) * 2003-11-24 2007-10-24 科倍隆威实理有限及两合公司 用于粉末或其它松散或可倾倒物料的混合料仓
EP1533022A3 (de) * 2003-11-24 2005-08-03 Coperion Waeschle GmbH & Co. KG Mischsilo zum Lagern und Mischen rieselfähiger Feststoffe, insbesondere von Pulvern
EP1533022A2 (de) * 2003-11-24 2005-05-25 Coperion Waeschle GmbH & Co. KG Mischsilo zum Lagern und Mischen rieselfähiger Feststoffe, insbesondere von Pulvern
US20110219952A1 (en) * 2008-11-26 2011-09-15 Univation Technologies, Llc Systems Using Mass Flow Promoting Insert with Gas Purging and Methods Thereof
US8470082B2 (en) 2008-11-26 2013-06-25 Univation Technologies, Llc Systems using mass flow promoting insert with gas purging and methods thereof
USD882186S1 (en) * 2018-12-18 2020-04-21 Zaxe Technologies Inc. Automatic animal feeder

Also Published As

Publication number Publication date
GB1390750A (en) 1975-04-16
FR2181084B1 (de) 1976-09-10
DE2219397C3 (de) 1975-07-24
JPS5426748B2 (de) 1979-09-05
DE2219397A1 (de) 1973-10-31
CH561078A5 (de) 1975-04-30
IT982306B (it) 1974-10-21
JPS4921754A (de) 1974-02-26
DE2219397B2 (de) 1974-08-01
FR2181084A1 (de) 1973-11-30

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