EP0530556A1 - Verfahren und Apparat zum Mischen von Festkörpern oder ähnlichen - Google Patents

Verfahren und Apparat zum Mischen von Festkörpern oder ähnlichen Download PDF

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Publication number
EP0530556A1
EP0530556A1 EP92113777A EP92113777A EP0530556A1 EP 0530556 A1 EP0530556 A1 EP 0530556A1 EP 92113777 A EP92113777 A EP 92113777A EP 92113777 A EP92113777 A EP 92113777A EP 0530556 A1 EP0530556 A1 EP 0530556A1
Authority
EP
European Patent Office
Prior art keywords
mixing tube
vessel
solids
bottom wall
compartments
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.)
Withdrawn
Application number
EP92113777A
Other languages
English (en)
French (fr)
Inventor
James R. Lynn
Gerrit Fons
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.)
Phillips Petroleum Co
Original Assignee
Phillips Petroleum Co
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 Phillips Petroleum Co filed Critical Phillips Petroleum Co
Publication of EP0530556A1 publication Critical patent/EP0530556A1/de
Withdrawn legal-status Critical Current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
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/80—Falling particle mixers, e.g. with repeated agitation along a vertical axis
    • B01F25/82—Falling particle mixers, e.g. with repeated agitation along a vertical axis uniting flows of material taken from different parts of a receptacle or from a set of different receptacles
    • B01F25/821—Falling particle mixers, e.g. with repeated agitation along a vertical axis uniting flows of material taken from different parts of a receptacle or from a set of different receptacles by means of conduits having inlet openings at different levels
    • B01F25/8211—Falling particle mixers, e.g. with repeated agitation along a vertical axis uniting flows of material taken from different parts of a receptacle or from a set of different receptacles by means of conduits having inlet openings at different levels by means of a central conduit or central set of conduits

Definitions

  • This invention relates to blending.
  • the invention relates to a novel apparatus and method for blending of particulate materials.
  • Blending of the pellets made in such runs is important to insure products of uniform quality. Efficient blending of particulate materials can be accomplished by the use of apparatus which comprises a vessel having a plurality of vertically extending tubes therein. The solids to be blended are positioned within the vessel surrounding the tubes. The tubes are provided with openings through which the particles enter the tubes to flow by gravity downwardly through the tubes to a common collection zone.
  • a preferred embodiment of the blender apparatus of the present invention employs a blender vessel having an outer storage chamber and a single inner mixing tube wherein the inner mixing tube comprises a tube extending generally parallel to the vertical axis of the vessel and wherein the tube is divided into a plurality of separate compartments by an inner divider means and wherein the tube is provided with a plurality of openings so that each compartment is in direct fluid flow communication with the outer storage chamber by way of at least one of the openings.
  • an upright, generally cylindrical vessel 10 comprising a generally cylindrical side-wall 12, a top closure 14, and a downwardly converging, generally frustoconically shaped bottom wall or closure 16.
  • the length to diameter ratio of the cylindrical vessel 10 is generally in the range from about 1.5:1 to about 3.5:1.
  • the top closure 14 is provided with a solids inlet or filling port 18 and a vent 20.
  • the top closure 14 is provided with a first opening 22, and the bottom wall or closure 16 is provided with a second opening 24.
  • a single mixing tube 26 having a first end 28 and a second end 30 is positioned with the first end 28 above the top closure 14 and the mixing tube 26 passing through the first opening 22 which opening 22 is suitably sealingly engaged with the outer surface of the mixing tube 26.
  • the mixing tube 26 extends downwardly through the vessel 10 and through the second opening 24 in the bottom wall 16, which opening 24 is suitably sealingly engaged with the outer surface of the mixing tube 26.
  • the second end 30 of the mixing tube 26 is positioned beneath the bottom wall or closure 16 of the vessel 10.
  • the interior of the mixing tube 26 is provided with a longitudinally extending divider means for dividing the mixing tube into a plurality of longitudinally extending compartments.
  • the divider means divides the mixing tube into from about 4 to about 36 longitudinally extending compartments. More preferably, the divider means divides the mixing tube into from about 10 to about 30 longitudinally extending compartments.
  • the mixing tube 26 is provided with a plurality of openings so as to provide direct fluid flow communication between the annular space between the interior of the vessel 10 and the exterior of the mixing tube 26 and the plurality of longitudinally extending compartments of the mixing tube 26.
  • the ratio of the diameter of the cylindrical vessel 10 to the diameter of the mixing tube 26 is generally in the range of from about 5:1 to about 15:1.
  • the mixing tube 26 comprises an outer tube 32 and an inner tube 34.
  • the inner tube 34 is concentrically positioned within the outer tube 32 to thereby form an annular space therebetween.
  • a plurality of longitudinally extending divider plates 36 are positioned within the annular space between the inner tube 34 and the outer tube 32.
  • Each divider plate 36 has a first edge 38 that is positioned in direct contact with the outer wall of the inner tube 34, and a second edge 40 that is positioned in direct contact with the inner wall of the outer tube 32.
  • Each divider plate 36 extends at least substantially the full length of the inner tube 34, thereby dividing the annular space between the inner tube 34 and the outer tube 32 into a plurality, preferably from about 4 to about 36, of longitudinally extending compartments 42.
  • the longitudinally extending compartments 42 each have approximately the same cross-sectional area.
  • the outer tube 32 of the mixing tube 26 is provided with a plurality of openings 44.
  • the openings 44 are positioned at varying elevations on the mixing tube 26 between the top closure 14 and the bottom wall or closure 16 of the vessel 10.
  • the openings 44 are positioned around the circumference of the mixing tube 26 so that each longitudinally extending compartment 42 is in direct fluid flow communication with the annular space between the interior of the vessel 10 and the exterior of the outer tube 32 by means of at least one opening 44.
  • the openings 44 can be of any suitable size and shape that will allow the free flow of particulate materials or solids from the interior of the vessel 10 into the longitudinally extending compartments 42.
  • the openings 44 have a sufficiently narrow dimension in the horizontal direction that each opening 44 provides direct fluid flow communication from the interior of the vessel 10 to only one of the longitudinally extending compartments 42.
  • the openings 44 are elongated so as to have a greater length in the vertical direction than the length in the horizontal direction so as to allow a maximum flow rate from the interior of the vessel 10 to the longitudinally extending compartments 42 without allowing flow from the interior of the vessel 10 to more than one longitudinally extending compartment 42 through any one opening 44.
  • a second opening 44 at approximately the same elevation positioned at the opposite side of the outer tube 32 as illustrated in Figure 3.
  • the purpose of the second opening 44 is to eliminate the pressure buildup against the outer tube 32 that is created by the flow of material toward the first opening 44. It is not necessary for each opening 44 to have a diametrically opposed second opening 44 at approximately the same elevation; however, by positioning a plurality of diametrically opposed openings 44 at various elevations along the outer tube 32, the external pressure upon the outer tube 32 created by the flow of material will be balanced, thereby eliminating the need for external tube supports that may obstruct the flow of material inside the vessel 10.
  • At least one bottom opening 45 in the outer tube 32 is positioned in contact with the edge or line of intersection along which the mixing tube 26 contacts or intersects the inner surface of the bottom wall or closure 16 of the vessel 10.
  • a plurality of bottom openings 45 in the outer tube 32 are positioned in evenly circumferentially space relation around the outer tube 32 in contact with the edge or line of intersection along which the mixing tube 26 contacts or intersects the inner surface of the bottom wall or closure 16 of the vessel 10.
  • four bottom openings 45 are positioned in evenly circumferentially space relation around the outer tube 32 in contact with the edge or line of intersection along which the mixing tube 26 contacts or intersects the inner surface of the bottom wall or closure 16 of the vessel 10.
  • At least one baffle 46 is positioned in contact with the bottom wall or closure 16 of the vessel 10 so as to direct particulate materials or solids toward the bottom openings 45 that exist in contact with the edge or line of intersection that exists between the mixing tube 26 and the inner surface of the bottom wall or closure 16 of the vessel 10.
  • FIGS. 4 and 7 illustrate a vessel 10 which is provided with four separate baffles 46 in contact with the bottom wall or closure 16 of the vessel 10.
  • the baffles 46 are equally circumferentially spaced around the mixing tube 26 so as to direct flow of particulate materials or solids to four equally spaced locations along the edge or line of intersection along which the mixing tube 26 intersects the inner surface of the bottom wall or closure 16 of the vessel 10.
  • each baffle 46 comprises a first side 48 and a second side 50.
  • the first side 48 and the second side 50 have a common first edge 52 so that the first side 48 and second 50 form an acute angle.
  • the first edge 52 has a first end 54 in contact with the outer tube 32 and a second end 56 in contact with the bottom wall or closure 16 of the vessel 10.
  • the first side 48 of the baffle 46 has a second edge 58 which extends from the second end 56 of the first edge 52 along the bottom wall or closure 16 of the vessel 10 to a point at the junction of the bottom wall or closure 16 and the outer tube 32.
  • the first side 48 of the baffle 46 has a third edge 60 that extends from the first end 54 of the first edge 52 along the outer tube 32 to the point at which the second edge 58 intersects the junction of the outer tube 32 and the bottom wall or closure 16 of the vessel 10.
  • the second side 50 of the baffle 46 has a second edge 62 which extends from the second end 56 of the first edge 52 along the bottom wall or closure 16 of the vessel 10 to a point at the junction of the bottom wall or closure 16 and the outer tube 32.
  • the second side 50 of the baffle 46 has a third edge 64 that extends from the first end 54 of the first edge 52 along the outer tube 32 to the point at which the second edge 62 intersects the junction of the outer tube 32 and the bottom wall of closure 16 of the vessel 10.
  • the vessel 10 can be filled with particulate materials or solids to be blended by means of a conduit 70 which communicates with the solids inlet 18.
  • a conduit 72 having control means such as a rotary star valve 74 interposed therein, is connected to the second end 30 of the mixing tube 26 to withdraw blended particulate materials or solids.
  • Conduit 72 is connected to a withdrawal conduit 76 in which a valve 78 is interposed.
  • a conduit 80 having a valve 82 interposed therein, which extends from conduit 72 to the solids inlet 18.
  • a conduit 84 having a valve 86 interposed therein, extends from a source of pneumatic pressure, not shown, to the inlet of conduit 80.
  • the blended particulate materials or solids can thus be elevated and reintroduced into the vessel 10 via conduit 80 by means of pressurized air from the source of pneumatic pressure.
  • the vent 20 permits the transport air entering the conduit 80 to be exhausted from the vessel 10.
  • valve 74 In a first method of operation in accordance with this invention, the rotation of valve 74 is stopped to block flow through the valve 74 and the vessel 10 is filled with particulate materials or solids to be blended via the conduit 70. The valve 74 is then rotated to allow flow therethrough and the valve 78 is opened to permit the particulate materials or solids to drain by gravity from the vessel 10 through the mixing tube 26 to the withdrawal conduit 76. Valve 86 is closed at this time so that no particulate materials or solids are recycled.
  • the vessel 10 can be operated in the same manner except that blending is accomplished continuously with particulate materials or solids to be blended being introduced through the solids inlet 18 and withdrawn through the conduit 72 at the same time. In still another method of operation, a part or all of the blended particulate materials or solids can be recycled through conduit 80 back to the solids inlet 18 for further blending.
  • the mixing tube 26, as shown in Figure 3 is formed.
  • the outer tube 32, inner tube 34 and divider plates 36 are each formed separately by any suitable means, such as extrusion.
  • the first end 38 of each divider plate 36 is fixedly secured to the outer surface of the inner tube 34 by any suitable means, such as welding, in order to form an inner baffle means.
  • Welding is defined for the purposes of this application to mean the localized coalescencing of metal wherein coalescencing is produced by heating to suitable temperatures, with or without the application of pressure, and with or without the use of filler metal.
  • the inner tube 34 and the divider plates 36 can be formed as one single member by any suitable means, such as extrusion.
  • the inner baffle means formed by the combination of the inner tube 34 and the divider plates 36 is suspended over the outer tube 32 in axial alignment with the outer tube 32. At least one of the inner baffle means and the outer tube 32 is moved in a direction toward the other. Preferably, the inner baffle means is lowered into the outer tube 32 so that the inner surface of the outer tube 32 is sealingly engaged with the second end 40 of each divider plate 36.
  • a plurality of openings 44 are cut into the outer tube 32 by any suitable means at varying elevations on the outer tube 32 positioned around the circumference of the outer tube 32 so that each longitudinally extending compartment 42 that exists between the inner baffle means and the outer tube 32 is in direct fluid flow communication with the exterior of the outer tube 32 by means of at least one opening 44.
  • the mixing tube 26 is then axially aligned with the vessel 10.
  • the first end 28 of the mixing tube 26 is then inserted through the second opening 24 in the bottom wall 16 of the vessel 10, then passed upwardly through the entire length of the vessel 10.
  • the outer surface of the mixing tube 26 is fixedly secured to the inner surface of the bottom wall 16 of the vessel 10 by any suitable means, such as welding.
  • baffles 46 are then fixedly secured between the mixing tube 26 and the bottom wall 16 of the vessel 10.
  • the second edge 58 of the first side 48 and the second edge 62 of the second side 50 of each baffle 46 are secured to the bottom wall 16 of the vessel 10 by any suitable means, such as welding.
  • the third edge 60 of the first side 48 and the third edge 64 of the second side 50 of the baffles 46 are secured to the outer surface of the mixing tube 26 by any suitable means, such as welding.
  • the top closure 14 is fixedly secured to the side wall 12 of the vessel 10 with the mixing tube 26 passing through the first opening 22 in the top closure 14 so that the mixing tube 26 is sealingly engaged with the top closure 14, and assembly of the blending apparatus is complete.
  • a significant feature of the apparatus of the present invention is that all particulate material flows through a single mixing tube 26. With only a single mixing tube 26 to be positioned within the vessel 10, the apparatus is more easily fabricated in the field. Additionally, each longitudinally extending compartment 42 of the mixing tube 26 is essentially straight. Thus, the particulate materials are neither subjected to angular flow within the longitudinally extending compartments 42 nor potential material retention at angular welds, which provides greater assurance of equal flow from each longitudinally extending compartment 42. Additionally, this provides for a simplified wash system of the apparatus by providing for more complete cleaning of the longitudinally extending compartments 42 and affording an improved inspection potential of the longitudinally extending compartments 42. Furthermore, the elimination of the need for internal supports to hold the mixing tube 26 in position will diminish the obstruction of flow patterns and possible retention of particulate material within the vessel 10.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
EP92113777A 1991-08-12 1992-08-12 Verfahren und Apparat zum Mischen von Festkörpern oder ähnlichen Withdrawn EP0530556A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US74462391A 1991-08-12 1991-08-12
US744623 1991-08-12

Publications (1)

Publication Number Publication Date
EP0530556A1 true EP0530556A1 (de) 1993-03-10

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EP (1) EP0530556A1 (de)
JP (1) JPH05285358A (de)
CA (1) CA2075763A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6494612B2 (en) * 2000-09-07 2002-12-17 Jr Johanson, Inc. Racetrack-shaped dynamic gravity flow blender
DE10332233A1 (de) * 2003-07-16 2005-02-24 Motan Materials Handling Gmbh Mischsilo

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5463191B2 (ja) * 2010-04-13 2014-04-09 株式会社ナルコ岩井 多分割パイプ及び重力式ブレンダーサイロ

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3539154A (en) * 1968-12-04 1970-11-10 Phillips Petroleum Co Blending apparatus
DE2006770A1 (en) * 1970-02-14 1971-09-16 Miag Muehlenbau & Ind Gmbh Mixing silo for plastic chips or other sharp-edged granules
DE3401687A1 (de) * 1984-01-19 1985-07-25 Hahn Verfahrenstechnik GmbH, 6052 Mühlheim Gravitationsmischer
DE3707264A1 (de) * 1986-03-07 1987-09-10 Avt Anlagen Verfahrenstech Vorrichtung zum mischen von staub- und pulverfoermigen sowie grobkoernigen schuettguetern

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3539154A (en) * 1968-12-04 1970-11-10 Phillips Petroleum Co Blending apparatus
DE2006770A1 (en) * 1970-02-14 1971-09-16 Miag Muehlenbau & Ind Gmbh Mixing silo for plastic chips or other sharp-edged granules
DE3401687A1 (de) * 1984-01-19 1985-07-25 Hahn Verfahrenstechnik GmbH, 6052 Mühlheim Gravitationsmischer
DE3707264A1 (de) * 1986-03-07 1987-09-10 Avt Anlagen Verfahrenstech Vorrichtung zum mischen von staub- und pulverfoermigen sowie grobkoernigen schuettguetern

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6494612B2 (en) * 2000-09-07 2002-12-17 Jr Johanson, Inc. Racetrack-shaped dynamic gravity flow blender
DE10332233A1 (de) * 2003-07-16 2005-02-24 Motan Materials Handling Gmbh Mischsilo
DE10332233B4 (de) * 2003-07-16 2006-04-20 Motan Materials Handling Gmbh Mischsilo

Also Published As

Publication number Publication date
CA2075763A1 (en) 1993-02-13
JPH05285358A (ja) 1993-11-02

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