US3647188A - Airlift blending apparatus - Google Patents

Airlift blending apparatus Download PDF

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Publication number
US3647188A
US3647188A US3647188DA US3647188A US 3647188 A US3647188 A US 3647188A US 3647188D A US3647188D A US 3647188DA US 3647188 A US3647188 A US 3647188A
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blending
material
gas
vessel
divider
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Paul E Solt
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Fuller Co
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Fuller Co
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Assigned to SECURITY PACIFIC BUSINESS CREDIT INC., A CORP OF DE reassignment SECURITY PACIFIC BUSINESS CREDIT INC., A CORP OF DE SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FULLER COMPANY, A DE CORP
Assigned to BARCLAYS-AMERICAN/BUSINESS CREDIT, INC., 111 FOUNDERS PLAZA, EAST HARTFORD, CT. 06108 A CT. CORP. reassignment BARCLAYS-AMERICAN/BUSINESS CREDIT, INC., 111 FOUNDERS PLAZA, EAST HARTFORD, CT. 06108 A CT. CORP. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FULLER COMPANY
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Assigned to FULLER COMPANY reassignment FULLER COMPANY RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: SECURITY PACIFIC BUSINESS CREDIT INC.
Assigned to FULLER COMPANY reassignment FULLER COMPANY RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: BARCLAYS BUSINESS CREDIT, INC., A CORP OF CT
Application status is Expired - Lifetime legal-status Critical

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING
    • B01F13/00Other mixers; Mixing plant, including combinations of mixers, e.g. of dissimilar mixers
    • B01F13/02Mixers with gas or liquid agitation, e.g. with air supply tubes
    • B01F13/0233Mixers with 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
    • B01F13/0238Mixers with 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
    • B01F13/025Mixers with 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 involving gas diffusers at the bottom

Abstract

A blending apparatus for mixing dry powdered materials consisting of an upright silo with a gas-permeable divider and a gas supply providing fluidizing gas up through the divider. A hollow blending column, open at its top and bottom, is vertically mounted in the silo with its bottom end spaced from the gaspermeable divider and gas is directed upwardly through the blending column at a velocity higher than the fluidizing gas velocity in the silo to circulate material from the silo upwardly through the blending column.

Description

[ 1 Mar.7,1l972 [54] AKRLHFT BLENDHNG APPARATUS FOREKGN PATENTS 0R AllPLICATlONS [72] Inventor: Paul E. Salt, Allentown, Pa. 543,647 12/1955 Belgium ..259/D1G. 17 [73] Amgnee: Fumr p y 539,141 1 1/ 1931 Germany ..259/DEG. 17

22] Filed; 25, 970 Primary ExamIner-Robert W. Jenkins Attorney-Jack L. Prat her, Donald R. Comuzzi and John L. [21] Appl. No.: 22,640 sigalos 52 us. ca. ..259/4, 259/010. 17 [57] mm [51] int. Cl. ..B0lt 13/02 A blending apparatus for mixing dry powdered materials con [58] Fieldoisearch "259/4, 18, D16. 17, l, 95 sisting of an upright silo with a gas-penneable divider and a gas supply providing fluidizing gas up through the divider. A [56] References Cit d hollow blending column, open at its top and bottom, is vertically mounted in the silo with its bottom end spaced from the UNITED STATES PATENTS gas-permeable divider and gas is directed upwardly through the blending column at a velocity higher than the fluidizing gas 2,723,838 1 1/1955 Peters ..259/4 velocity in the silo to circulate material from the Silo upwardly 3,179,378 4/1965 Zenz ..259/4 through the blending column 3,490,655 I/ 1970 Ledgett... ..259/4 3,351,326 11/1967 Alberts ..259/4 6 Claims, 4 Drawing Figures l -|4 q 22 f 22 10 l 1 r l 1,: 1 9 l .21 j 4 s z 2| s y 22 23 1 v I a I? A l 1 u I I i V 8 4 x PATENTEDMAR 7 i972 FIG.I.

com HEsEo AIR , maslmxwtw FIG.4.

mmml

Fuss.

INVENTOR PAUL E. SOLT BY gn/mz, W W f vv d/m ATTORNEYS BACKGROUND OF THE INVENTION This invention relates to bulk blending apparatus for the mixing and blending of dry pulverulent materials. Materials to be blended are usually introduced into a suitable bin or vessel. It is essential that the various materials be completely intermingled and mixed prior to being discharged from the vessel. This invention is concerned more specifically with the blending of dry powdered materials that are not free-flowing and which require fluidization, such as cement raw materials.

Various means have been employed to achieve the aforementioned blending of materials. The blending of mixtures of dry powdered fluidizable materials is frequently accomplished by introducing a diffused flow of gas through the material to produce a fluidized condition of the air-material mixture. Blending can thus be accomplished in a vessel with a porous bottom through which the fluidizing gas is diffused and introduced into the powdered material. By adjusting the velocity of gas through the material it is possible to introduce various degrees of turbulence and as a consequence, various rates and completeness of blending within the vessel.

A further improvement of the aforementioned type of ap- I paratus is disclosed in US. Pat. No. 3,003,752 and U.S. Pat. No. 2,844,361 and includes a vessel provided with a gaspermeable floor. The gas-permeable floor is separated into quadrants with means provided for individually varying the amount of airflow through a selected quadrant. In this way, increased airflow through a given quadrant will decrease the density of the air-material mixture above the more active quadrant thereby reducing the pressure of the material over this quadrant. The material over the more active quadrant rises upwardly and flows over the top of the fluidized material in the less active adjacent quadrants. Furthermore, the more dense material in the less active quadrants flows inwardly to replace the less dense material in the active quadrant thereby promoting the blending action. As the diameter and height of the blending receptacle are increased, the delineation of the active zone becomes less distinct. This, of course, reduces the blending efficiency of the apparatus.

It is, therefore, an object of this invention to create a welldefined and controlled column of a reduced density of gasmaterial mixture in a fluidized mass of material which will increase circulation of material and thereby increase blending efficiency.

SUMMARY OF THE INVENTION This invention relates to a blending system for dry pulverulent material comprising an upright vessel with a material inlet port and a material outlet port, a gas-permeable divider positioned in the vessel and dividing the vessel into an upper material chamber and a plenum chamber, at least one blend ing column vertically mounted inside said vessel, said blending column being hollow and open at its top and bottom with the bottom being spaced from the divider to provide a material intake opening into the blending column, fluidizing gas means in fluid flow communication with the plenum chamber for supplying fluidizing gas to the material chamber through the divider, and blending gas supply means adapted to supply gas into the bottom of the blending column at a velocity higher than that of the fluidizing gas supplied to the material chamber. A plurality of blending columns can be used and the columns can be varied in height and/0r can have openings positioned along their length to create intermixing at various levels of the material.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings:

FIG. I is a sectional view of a blending apparatus of the present invention;

FIG. 2 is a sectional view of an alternate embodiment of the invention;

FIG. 3 is a sectional view of a modified form of blending chamber of the apparatus of FIGS. 1 or 2 having openings in the walls thereof; and

FIG. 4 is a modification of the apparatus of FIG. 1 having a material discharge port located in the upper portion of the material chamber.

DETAILED DESCRIPTION nected to a discharge conduit 15 having a cutoff valve 16 therein to control material discharge from the bin. Spaced from the bottom 17 of the bin 10 is a gas-permeable divider 18 which divides the bin into an upper material chamber 27 and a lower plenum chamber 19. The divider l8 slopes from all points on the upper surface thereof toward the material outlet port 13. Thus the divider of FIG. 1 is an inverted truncated cone and that of FIG. 2 is a sloping trough. The divider 18 may be comprised of any suitable gas-permeable medium such as porous stones, fabric or perforated metal and overlies the plenum chamber 19. A gas conduit 20 delivers gas under pressure, suitably air for inert materials, to the plenum chamber 19 to provide fluidizing air for the material chamber 27. An advantage of the truncated cone-shaped divider 18 is that it assists the flow of material along the upper surface of the divider toward the blending column thus eliminating segregation of the material. This is particularly important in the modification of FIG. 4 in which the cutoff valve 16 is closed and the blender operates continuously with the material discharging through a material discharge conduit 15 located in the upper portion of the material chamber 27. In this arrangement of FIG. 4, the material conduit 15' acts like a material overflow to discharge material in a continuous operation. The cutoff valve 16 is then used as a cleanout valve for removing oversized particles from the material chamber. Like parts of the apparatus of FIG. 4 have the same numerals as FIG. 1 and operate in the same manner as described with reference to FIG. 1.

A hollow blending column 21 in the form of a cylindrical tube or casing and open at its top and bottom and having a funnel-shaped bottom 23 is mounted vertically in the vessel 10. The blending chamber 21 is connected to the vessel by connecting means, such as metal rods 22, and the lower end of the chamber is spaced from the divider 18 to provide a material intake opening 28. Nozzles 24 receive gas from the gas conduit 20 and direct a higher velocity gas into the blending column 21. This higher velocity gas has a greater lifting action than the fluidizing air passing through the gas-permeable divider 18, thereby creating a less dense column of material in the column 21. The less dense column is displaced upwardly through the column 21 by the more dense material flowinginto the chamber through intake opening 28.

In FIG. 2 is shown a form of the invention in which a plurality of blending columns 21' of varying heights are mounted in the material vessel by supports (not shown) in a manner similar to the chamber 21 in FIG. I. The varying heights permit discharge of material at different levels, thus creating intermixing of different levels of material. The columns may, of course, be of the same height. In this form of the invention a separate gas conduit 26 is utilized for supplying the blending gas to the nozzles 24. This permits better control of the velocities of the fluidizing gas supplied by gas conduit 20 and blending gas supplied by conduit 26. One velocity can be modified without directly affecting the other, thus permitting rapid adjustments that may be necessary due to the condition of or type or material to be blended.

In FIG. 3 is shown a modified form of blending column of the type shown in FIGS. 1 and 2, but containing a plurality of openings 25 through its wall at various elevations. These openings permit partial flow of material into and out of the blending column at various levels, thereby intermingling the material in the column with materials at various levels in the material chamber 27. It will be understood that the openings may be only at the top, or bottom, or any combination of positions of the column dependent upon the blending conditions desired.

The operation of the assembly is largely evident from the foregoing description. A low volume of air is supplied into the plenum chamber 19 of the vessel to provide fluidizing air to pass up through the divider 18 and into the vessel 10. Fluidizing air at a substantially higher volume is directed into the blending column 21 or 21' for expanding material in the chamber. The expanded material column in the column is less dense, and therefore, has less-pressure head than the surrounding material in the material chamber 27. A material flow pattern is thereby established with the high-pressure material surrounding the vertical blending column flowing toward and into the bottom of the blending column and being displaced upwardly through the chamber and out through the top of the column and across the top of the material in the vessel, as shown by the arrows. This creates a continuous and rapid circulation of material upwardly through the column despite the fluidized mass of material in the chamber 27, and produces a rapid blending action which accomplishes the blending operation in a shorter period of time and with a reduced total air requirement. The degree of mixing, as noted, can be varied by the provision of additional vertical columns disposed within the vessel, by making the columns of different heights, thus providing discharge zones at different levels in the vessel thereby creating mixing of different levels within the vessel, and by providing the column or columns with openings at various points along their length which permits partial flow of material into and out of the column at various elevations.

It will be understood that is is intended to cover all changes and modifications of the disclosure of the invention herein chosen for the purpose of illustration which do not constitute departures from the spirit and scope of the invention.

I claim:

1. A blending system for dry pulverulent material comprising an upright vessel with a material inlet port and a material outlet port, a gas-permeable divider positioned in the vessel dividing the vessel into a material chamber and a lower plenum chamber, said gas permeable divider being in the general form of an inverted truncated cone, at least one blending column vertically mounted inside said vessel and extending upwardly from said divider, said blending column being hollow and open at its top and bottom with the bottom being spaced from the divider to provide a material-intake opening into the blending column, fluidizing gas means in fluid flow communication with the vessel for supplying fluidizing gas to the material chamber through the divider, and blending gas supply means adapted to supply gas into the bottom of the blending column at a velocity higher than that of the fluidizing gas supplied to the material chamber.

2. The apparatus of claim 1 in which a plurality of blending columns are mounted in said vessel.

3. The apparatus of claim 2 in which said blending columns terminate at different heights above the gas-permeable di vider.

4. The apparatus of claim 2 wherein the blending columns contain openings positioned along their length.

5. The apparatus of claim 3 wherein the blending columns contain openings positioned along their length.

6. The apparatus of claim 1 wherein the material outlet port is located in the upper portion of the upright vessel.

Claims (6)

1. A blending system for dry pulverulent material comprising an upright vessel with a material inlet port and a material outlet port, a gas-permeable divider positioned in the vessel dividing the vessel into a material chamber and a lower plenum chamber, said gas permeable divider being in the general form of an inverted truncated cone, at least one blending column vertically mounted inside said vessel and extending upwardly from said divider, said blending column being hollow and open at its top and bottom with the bottom being spaced from the divider to provide a material-intake opening into the blending column, fluidizing gas means in fluid flow communication With the vessel for supplying fluidizing gas to the material chamber through the divider, and blending gas supply means adapted to supply gas into the bottom of the blending column at a velocity higher than that of the fluidizing gas supplied to the material chamber.
2. The apparatus of claim 1 in which a plurality of blending columns are mounted in said vessel.
3. The apparatus of claim 2 in which said blending columns terminate at different heights above the gas-permeable divider.
4. The apparatus of claim 2 wherein the blending columns contain openings positioned along their length.
5. The apparatus of claim 3 wherein the blending columns contain openings positioned along their length.
6. The apparatus of claim 1 wherein the material outlet port is located in the upper portion of the upright vessel.
US3647188D 1970-03-25 1970-03-25 Airlift blending apparatus Expired - Lifetime US3647188A (en)

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DE (1) DE2106591A1 (en)
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GB (1) GB1279799A (en)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3756569A (en) * 1969-07-23 1973-09-04 Bayer Ag Apparatus for mixing and homogenising bulk material and method of operating the apparatus
US3807705A (en) * 1972-06-28 1974-04-30 Du Pont Process and apparatus for solids blending
US3887337A (en) * 1971-08-19 1975-06-03 Studiecentrum Kernenergi Fluidization column
US3953003A (en) * 1974-06-06 1976-04-27 Aluterv Aluminiumipari Tervezo Vallalat Tank provided with pneumatic mixing pipe
US3955717A (en) * 1969-08-06 1976-05-11 Landau Richard E Methods and apparatus for flowing archable materials
US4042220A (en) * 1975-10-02 1977-08-16 E. I. Du Pont De Nemours And Company Apparatus for solids blending
US4097026A (en) * 1975-01-24 1978-06-27 Vyzkumny Ustav Vodohospodarsky Apparatus for mixing a basic liquid substance with other media
US4185926A (en) * 1978-02-28 1980-01-29 Westinghouse Electric Corp. Safe-geometry pneumatic nuclear fuel powder blender
US4466082A (en) * 1982-02-02 1984-08-14 Foster Wheeler Energy Corporation Apparatus for mixing and distributing solid particulate material
US4569596A (en) * 1985-11-26 1986-02-11 Fuller Company Pneumatic conveying and material blending apparatus and method
US4577972A (en) * 1980-10-15 1986-03-25 Westinghouse Electric Corp. Spouted bed blender apparatus
US4630931A (en) * 1984-02-28 1986-12-23 Magyar Aluminiumipari Troszt Process and apparatus for the mixing of slurries
US4740087A (en) * 1986-12-16 1988-04-26 Illinois Tool Works Inc. Magnetic particle bath suspension apparatus
US4782843A (en) * 1987-05-15 1988-11-08 James Lapaglia Apparatus for cleaning particulate material
DE3739976A1 (en) * 1987-11-19 1989-06-08 Ts Ex I Kt Lab Khim Selskogo Compressed-air mixer for pourable materials
US4944598A (en) * 1989-05-10 1990-07-31 Dynamic Air Inc. Continuous flow air blender for dry granular materials
US20040233776A1 (en) * 2003-05-21 2004-11-25 Dynamic Air Inc. Blender
US20070258318A1 (en) * 2006-05-08 2007-11-08 Douglas Lamon Method And Apparatus For Reservoir Mixing
WO2009097969A1 (en) * 2008-02-09 2009-08-13 Uhde Gmbh Method and device for receiving and handing over fine-grain to coarse-grain solids from a container to a higher pressure system
US20100232254A1 (en) * 2007-02-27 2010-09-16 Chicago Bridge & Iron Company Liquid storage tank with draft tube mixing system
US20110058905A1 (en) * 2008-05-21 2011-03-10 Uhde Gmbh Device for discharging a solid material from a container
CN101227969B (en) 2005-07-28 2013-01-30 株式会社小原 Gas discharge device and glass manufacturing method
US8646664B2 (en) 2008-03-17 2014-02-11 Thyssenkrupp Uhde Gmbh Method and device for the metered removal of a fine to coarse-grained solid matter or solid matter mixture from a storage container
RU2703311C1 (en) * 2019-04-15 2019-10-16 Федеральное государственное бюджетное образовательное учреждение высшего образования "Донской государственный аграрный университет" (ФГБОУ ВО Донской ГАУ) Bunkering device for collapse of arches of bulk material

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3729175A (en) * 1971-03-12 1973-04-24 Fuller Co Blending apparatus
CA1211142A (en) * 1984-04-04 1986-09-09 Robert E. Romanchik Pneumatic conveying and material blending apparatus and method

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US2723838A (en) * 1952-11-15 1955-11-15 Kloeckner Humboldt Deutz Ag Apparatus for mixing and homogenizing pulverulent or fine-grained materials
US3179378A (en) * 1962-12-26 1965-04-20 Ducon Co Apparatus for mixing and transporting finely divided solids
US3351326A (en) * 1964-10-07 1967-11-07 Rexall Drug Chemical Process and apparatus for solids blending
US3490655A (en) * 1966-08-17 1970-01-20 Colgate Palmolive Co Material blending silo

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE543647A (en) *
DE539141C (en) * 1930-10-21 1931-11-21 Polysius A G G Method and device for mixing or dust-like mehlfoermigem Good
US2723838A (en) * 1952-11-15 1955-11-15 Kloeckner Humboldt Deutz Ag Apparatus for mixing and homogenizing pulverulent or fine-grained materials
US3179378A (en) * 1962-12-26 1965-04-20 Ducon Co Apparatus for mixing and transporting finely divided solids
US3351326A (en) * 1964-10-07 1967-11-07 Rexall Drug Chemical Process and apparatus for solids blending
US3490655A (en) * 1966-08-17 1970-01-20 Colgate Palmolive Co Material blending silo

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3756569A (en) * 1969-07-23 1973-09-04 Bayer Ag Apparatus for mixing and homogenising bulk material and method of operating the apparatus
US3955717A (en) * 1969-08-06 1976-05-11 Landau Richard E Methods and apparatus for flowing archable materials
US3887337A (en) * 1971-08-19 1975-06-03 Studiecentrum Kernenergi Fluidization column
US3807705A (en) * 1972-06-28 1974-04-30 Du Pont Process and apparatus for solids blending
US3953003A (en) * 1974-06-06 1976-04-27 Aluterv Aluminiumipari Tervezo Vallalat Tank provided with pneumatic mixing pipe
US4097026A (en) * 1975-01-24 1978-06-27 Vyzkumny Ustav Vodohospodarsky Apparatus for mixing a basic liquid substance with other media
US4042220A (en) * 1975-10-02 1977-08-16 E. I. Du Pont De Nemours And Company Apparatus for solids blending
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
US4466082A (en) * 1982-02-02 1984-08-14 Foster Wheeler Energy Corporation Apparatus for mixing and distributing solid particulate material
US4630931A (en) * 1984-02-28 1986-12-23 Magyar Aluminiumipari Troszt Process and apparatus for the mixing of slurries
US4569596A (en) * 1985-11-26 1986-02-11 Fuller Company Pneumatic conveying and material blending apparatus and method
US4740087A (en) * 1986-12-16 1988-04-26 Illinois Tool Works Inc. Magnetic particle bath suspension apparatus
US4782843A (en) * 1987-05-15 1988-11-08 James Lapaglia Apparatus for cleaning particulate material
DE3739976A1 (en) * 1987-11-19 1989-06-08 Ts Ex I Kt Lab Khim Selskogo Compressed-air mixer for pourable materials
US4944598A (en) * 1989-05-10 1990-07-31 Dynamic Air Inc. Continuous flow air blender for dry granular materials
US20040233776A1 (en) * 2003-05-21 2004-11-25 Dynamic Air Inc. Blender
US7267475B2 (en) 2003-05-21 2007-09-11 Dynamic Air Inc. Blender
CN101227969B (en) 2005-07-28 2013-01-30 株式会社小原 Gas discharge device and glass manufacturing method
US20070258318A1 (en) * 2006-05-08 2007-11-08 Douglas Lamon Method And Apparatus For Reservoir Mixing
US20080151684A1 (en) * 2006-05-08 2008-06-26 Douglas Lamon Method and Apparatus for Reservoir Mixing
US8287178B2 (en) 2006-05-08 2012-10-16 Landmark Structures I, L.P. Method and apparatus for reservoir mixing
US8790001B2 (en) 2006-05-08 2014-07-29 Landmark Structures I, L.P. Method for reservoir mixing in a municipal water supply system
US8118477B2 (en) * 2006-05-08 2012-02-21 Landmark Structures I, L.P. Apparatus for reservoir mixing in a municipal water supply system
US20100232254A1 (en) * 2007-02-27 2010-09-16 Chicago Bridge & Iron Company Liquid storage tank with draft tube mixing system
US8157432B2 (en) * 2007-02-27 2012-04-17 Chicago Bridge & Iron Company Method of mixing a fluid in a tank with a draft tube mixing system
CN101939235B (en) 2008-02-09 2012-07-18 犹德有限公司 Method and device for receiving and handing over fine-grain to coarse-grain solids from a container to a higher pressure system
AU2009211886B2 (en) * 2008-02-09 2012-09-13 Thyssenkrupp Uhde Gmbh Method and device for receiving and handing over fine-grain to coarse-grain solids from a container to a higher pressure system
US20100322721A1 (en) * 2008-02-09 2010-12-23 Uhde Gmbh Method and apparatus for receiving fine-grained to coarse-grained solids from a vessel and transferring them to a higher-pressure system
RU2469939C2 (en) * 2008-02-09 2012-12-20 Тиссенкрупп Уде Гмбх Method and device for receiving and transferring fine to coarse substances from bin to high pressure system
WO2009097969A1 (en) * 2008-02-09 2009-08-13 Uhde Gmbh Method and device for receiving and handing over fine-grain to coarse-grain solids from a container to a higher pressure system
US8646664B2 (en) 2008-03-17 2014-02-11 Thyssenkrupp Uhde Gmbh Method and device for the metered removal of a fine to coarse-grained solid matter or solid matter mixture from a storage container
US20110058905A1 (en) * 2008-05-21 2011-03-10 Uhde Gmbh Device for discharging a solid material from a container
RU2703311C1 (en) * 2019-04-15 2019-10-16 Федеральное государственное бюджетное образовательное учреждение высшего образования "Донской государственный аграрный университет" (ФГБОУ ВО Донской ГАУ) Bunkering device for collapse of arches of bulk material

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GB1279799A (en) 1972-06-28
FR2084721A5 (en) 1971-12-17
DE2106591A1 (en) 1971-10-14
CA936524A (en) 1973-11-06
CA936524A1 (en)

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Effective date: 19861231

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