EP0303864B1 - Silo pour matières en vrac pulvérulentes et à grains serrés - Google Patents

Silo pour matières en vrac pulvérulentes et à grains serrés Download PDF

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Publication number
EP0303864B1
EP0303864B1 EP88112178A EP88112178A EP0303864B1 EP 0303864 B1 EP0303864 B1 EP 0303864B1 EP 88112178 A EP88112178 A EP 88112178A EP 88112178 A EP88112178 A EP 88112178A EP 0303864 B1 EP0303864 B1 EP 0303864B1
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EP
European Patent Office
Prior art keywords
silo
slots
silo according
bulk material
floor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88112178A
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German (de)
English (en)
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EP0303864A3 (en
EP0303864A2 (fr
Inventor
Werner Dipl.-Ing. Krauss
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.)
IBAU Hamburg Ingenieurgesellschaft Industriebau mbH
Original Assignee
IBAU Hamburg Ingenieurgesellschaft Industriebau mbH
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Publication date
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Application filed by IBAU Hamburg Ingenieurgesellschaft Industriebau mbH filed Critical IBAU Hamburg Ingenieurgesellschaft Industriebau mbH
Priority to AT88112178T priority Critical patent/ATE76844T1/de
Priority to US07/268,256 priority patent/US4989380A/en
Publication of EP0303864A2 publication Critical patent/EP0303864A2/fr
Publication of EP0303864A3 publication Critical patent/EP0303864A3/de
Application granted granted Critical
Publication of EP0303864B1 publication Critical patent/EP0303864B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/54—Large containers characterised by means facilitating filling or emptying
    • B65D88/72—Fluidising devices

Definitions

  • the invention relates to a silo for dusty and fine-grained bulk goods with a conical hood in the center of the ring-shaped silo bottom, the silo bottom being coated with pneumatic fluidizing devices and being slightly inclined towards outlet openings.
  • Such silos are used for example for the storage of raw meal, cement, fly ash, coal dust and gypsum.
  • Known emptying devices of this type can be found in German publications 23 52 455 and 25 47 667.
  • Such silos have a conical silo bottom in the center, along which the sinking bulk material slides along into the outer ring bottom zone.
  • the ring-shaped silo bottom between the central cone and the silo outer wall is inclined towards the respective outlet openings and equipped with loosening units. It is envisaged that the ventilation of the bulk material in the bottom zone should result in a drain in the direction of the outlet openings.
  • the invention has for its object to provide a silo of the type mentioned, in which the bulk material stored in the silo in the form of a "mass flow", i.e. Sinks down evenly across the cross-section, thereby avoiding dead or passive zones in the silo and at the same time being energy-saving, maintenance-friendly and reliable.
  • This object is basically achieved in that an annular intermediate floor between the conical cover and the silo wall is arranged at a distance above the annular silo bottom, which has a plurality of radially arranged slots and adjoining fluidizing devices, the annular space forming the outlet chamber under the intermediate floor with a ventilation line connected is.
  • the opening cross sections of the slots are adjustable, i.e. adjustable from zero to a maximum desired cross section in order to directly influence the "mass flow”.
  • This outlet chamber is surprisingly not overfilled even during the loosening impulses on the silo floor above.
  • the volume of the chamber is such that there is sufficient absorption capacity.
  • the ventilation of the chamber ensures pressure equalization to the free upper silo area. Since the relaxation paths of the loosened bulk material on the overhead ring silo floor are the same for all surface areas and are extremely short due to the slot arrangement provided at short intervals, it is sufficient to loosen the frictional engagement, for example, for cement loosening with only a pressure difference of 200 to 300 mbar.
  • Conventional silo emptying in which the bulk material has to cover longer horizontal flow paths to the throttled silo outlet, make it necessary to design the compressors with pressure differences of 400 to 800 mbar. There have even recently been emptying systems that work with pressure differences of up to 7.5 bar for loosening in storage silos, see the magazine "Zement Kalk Gips" No. 11/86. On pages 596 and 597, a silo system with a diameter of 18 meters for cement is described.
  • Another advantage of the solution according to the invention is the quality improvement of the stored bulk material through the increased mass exchange within the mass flow streams produced.
  • the mixed trombones produced consist of a long, narrow trombone neck and a trumpet bell located at the level of the manor, mass flow streams are comparable to upside-down truncated cone shapes.
  • the effect of the base area extends over the actual area of the loosening section. Due to the changing ventilation of the loosening sections and the spatial expansion of the mass flow streams described above, interlocking flow profiles over the entire silo content become effective during the removal of material. Significant fluctuations in composition can no longer penetrate to the silo outlet, as in the known silo types, but can be dampened.
  • the overhead tray is therefore the actual functional tray for the advantageous process sequence described.
  • the loosening is expediently carried out by air troughs.
  • the hoods or embankments arranged above the slots prevent short-circuit conveyance into the outlet chamber, because the non-ventilated material, compacted by support on the silo wall and silo floor, is unable to convert the frictional forces of rest into horizontally directed movement forces.
  • the floor of the outlet chamber is constantly ventilated, in contrast to the sections of the floor above. It can also be advantageous to provide additional internals which inhibit the flow of bulk material. These internals are installed directly in the slots in the upper floor. Air troughs, loosening pipes or, for example, swiveling baffle plates can be used.
  • the flow resistance can be increased and, on the other hand, it can be reduced again, depending on the operating state.
  • the cross sections of the slots are designed so that blockages are avoided. In the case of concrete floors, the slots widen downwards in any case; in the case of steel structures, this can be omitted if necessary. With the appropriate design and protection of the described baffle plates, they can also be used to close the upper floor in order to inspect the outlet chamber when the silo is full, if necessary.
  • the loosening area of the upper floor can also be halved by alternating embankments as concrete gliders with the loosening sections.
  • these cover the slots immediately.
  • the pulse cycle depends on the amount of the volume flow taken from the silo, but also on the flow behavior of the bulk material.
  • the filling level of the outlet chamber is indicated by the back pressure in the ventilation system and can therefore be used as a control variable in a simple manner.
  • silo floor makes it possible to keep the cost of filling concrete very low, so that only by pulling in the upper floor an outlet chamber without additional effort compared to the comparable prior art is created.
  • silo outlet connections with appropriate shut-off and dosing devices, regardless of the size of the silo diameter.
  • the connection can be conveyed directly from these discharge nozzles because the discharge chamber simultaneously takes on a collecting and distributing function.
  • an additional material collection container with further metering devices is required behind the silo outlet connection for the purpose of distribution on subsequent conveyors.
  • the silo space 18 is delimited by a circular silo wall 20 and a silo floor with a centrally arranged cone and the annular floor 9.
  • a second floor 1 is located only a short distance above floor 9.
  • the bottom 1 is annular and is provided with radially arranged, slot-like outlet slots 2 through which the bulk material reaches the outlet chamber 3.
  • the flowability of the dust-like bulk material is influenced by changing the density or loosening state as a result of ventilation or venting of the sections 7 occupied by air conveying channels 11 - FIGS. 1 u. Fig. 2.
  • outlet slots 2 are according to an embodiment. 1, 3, cover plates 19.
  • the air conveying channels 11 laid on the floor 1 can also be used, as is shown in the lower half of the horizontal section in FIG. 2.
  • the outlet chamber 3 is connected to the upper silo for ventilation by pipes 8.
  • additional air feed channels 4 or rotatable loosening pipes 5 can be installed in the outlet slots 2 - FIGS. 3, 4.
  • the clear cross sections of the outlet slots 2 in the bottom 1 are gem.
  • Fig. 1, 2, 3 and 4 characterized by a very small width, a relatively long length and a vertical downward cross-section, conical extension.
  • outlet slots 2 are also expanded downwards in FIGS. 5 and 6 and can be covered from below by adjustable baffle plates 6.
  • Another type of controlled mass flow implementation is to make the outlet slots 2 comparatively large in their clear width and to design the cover elements in the form of slopes or concrete gliders 14 - FIGS. 7 and 8.
  • the overlaps of the air conveying troughs 11 through the embankments 14 can easily be chosen so that the remaining embankments remaining after loosening up in the bulk material do not reach the run-off edges of the outlet slots 2.
  • FIGS. 10 to 14 is basically constructed in the same way as the embodiment according to FIG. 1, so that the same reference numerals have been used for the same parts.
  • FIGS. 10 to 14 consists of the actual main silo space 18 with an outer wall 20.
  • an intermediate floor 21 is drawn in, which is also ring-shaped and lies between the conical hood 16 and the outer wall 20.
  • Radially extending slots 2 are provided in this intermediate floor 21, as can be seen in particular when looking at FIG. 12.
  • the fluidizing devices assigned to the slots 2 are formed by air conveyor troughs 11, the majority of which run in the circumferential direction and are arranged on slopes which are inclined in the direction of the slots. Smaller air conveyor channels 11 run radially.
  • the slots 2 are adjustable by gate valve 25. These gate valves can be closed completely or opened more or less as required.
  • the gate valve is operated from the interior of the cone cover.
  • a material level indicator for the outlet chamber 3 is designated 27. Vent lines lead from the outlet chamber 3 to the outside. Either they are Vent lines 8 on the outer wall 20 of the silo or vent lines 28, which are led through the conical cover 16 to the outside.
  • the outlet chamber 3 can be viewed and entered from inspection openings 29 from the cone hood 16.
  • Air conveyor troughs 10 are provided on the annular silo bottom 9. The arrangement is shown in FIG. 13.
  • the air conveying channels lead the bulk material to outlet openings 22, which can be closed to a greater or lesser extent by extraction elements 12 in order to ensure a metered discharge of material.
  • the air conveyor troughs are supplied by rotary lobe blowers 26.
  • an intermediate floor 21 is provided above the silo floor 9, the cross-section of which has adjustable slits 2 for the good entry from the silo space 18 into the outlet chamber 3.
  • the outlet chamber 3 is ventilated.
  • the outlet chamber 3 thus forms an annular space below the intermediate floor 21, through which a metered discharge of material is possible.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Seasonings (AREA)

Claims (10)

  1. Silo pour matières en vrac pulvérulentes et à grains serrés comprenant un capot conique au centre du fond annulaire du silo, le fond du silo étant garni de dispositifs pneumatiques de fluidification et étant faiblement incliné vers des ouvertures de sortie, caractérisé en ce qu'un fond intermédiaire annulaire (1, 21) est disposé à distance au-dessus du fond annulaire du silo (9), entre le capot conique (16) et la paroi (20) du silo et présente une pluralité de fentes (2) disposées radialement et de dispositifs de fluidification (11) adjacents, la chambre annulaire formant la chambre d'évacuation (3) sous le fond intermédiaire (1, 21) étant reliée à une conduite d'aération (8 ou 28).
  2. Silo selon la revendication 1, caractérisé en ce que la section transversale d'ouverture des fentes (2) est réglable.
  3. Silo selon la revendication 1 ou 2, caractérisé en ce que les fentes (2) sont munies d'un dispositif de recouvrement (19) permettant un passage latéral des matières en vrac.
  4. Silo selon la revendication 2 ou 3, caractérisé en ce que le réglage de la section transversale d'ouverture des fentes (2) s'effectue par des obstacles (4, 5, 6) ou des vannes d'arrêt (25).
  5. Silo selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que les dispositifs de fluidification (11) adjacents aux fentes (2) s'étendent dans la direction circonférentielle du fond intermédiaire annulaire (1, 21).
  6. Silo selon l'une ou plusieurs des revendications 1 à 5, caractérisé en ce que la conduite d'aération (8) est guidée vers l'extérieur le long de la paroi (20) du silo.
  7. Silo selon l'une ou plusieurs des revendications 1 à 5, caractérisé en ce que la conduite d'aération (28) est guidée vers l'extérieur à travers le capot conique (16).
  8. Silo selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que la chambre d'évacuation (3) aérée présente plusieurs ouvertures d'évacuation (22) comportant des organes d'évacuation réglables (12) pour doser la quantité de matières en vrac évacuée.
  9. Silo selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que le volume de la chambre d'évacuation (3) représente 2,5 à 5 % du volume total du silo (18).
  10. Silo selon l'une ou plusieurs des revendications précédentes, caractérisé en ce que des ouvertures d'inspection (15) ou (29) pour la chambre d'évacuation (3) sont prévues dans la paroi (20) du silo ou dans le capot conique (16).
EP88112178A 1987-08-20 1988-07-28 Silo pour matières en vrac pulvérulentes et à grains serrés Expired - Lifetime EP0303864B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT88112178T ATE76844T1 (de) 1987-08-20 1988-07-28 Silo fuer staubfoermige und feinkoernige schuettgueter.
US07/268,256 US4989380A (en) 1988-07-28 1988-11-07 Silo for pulverulent and fine-grained bulk materials

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873727767 DE3727767A1 (de) 1987-08-20 1987-08-20 Schuettgutsilo mit pneumatischer entleerung und entluefteter auslaufkammer
DE3727767 1987-08-20

Publications (3)

Publication Number Publication Date
EP0303864A2 EP0303864A2 (fr) 1989-02-22
EP0303864A3 EP0303864A3 (en) 1990-05-16
EP0303864B1 true EP0303864B1 (fr) 1992-06-03

Family

ID=6334122

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88112178A Expired - Lifetime EP0303864B1 (fr) 1987-08-20 1988-07-28 Silo pour matières en vrac pulvérulentes et à grains serrés

Country Status (3)

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EP (1) EP0303864B1 (fr)
AT (1) ATE76844T1 (fr)
DE (2) DE3727767A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3917533A1 (de) * 1989-05-30 1990-12-06 Moeller Hamburg Gmbh Co Kg Grossraumsilo fuer staubfoermiges und feinkoerniges schuettgut
DE59100490D1 (de) * 1991-08-14 1993-11-18 Ibau Hamburg Ing Ges Silo zum Lagern, Dosieren und Durchlaufmischen von fluidisierfähigen Schüttgütern.
CN103287858B (zh) * 2013-06-13 2015-07-01 赵世青 落地式粉料储库
CN105621102B (zh) * 2016-03-21 2017-10-20 赵世青 粉料库线式取料装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7523514U (de) * 1975-11-13 Polysius Ag Behälterboden zum pneumatischen Austragen von Feingut
GB1511957A (en) * 1975-07-23 1978-05-24 Polysius Ag Container base for the pneumatic discharge of fine material
DE3440833A1 (de) * 1984-11-08 1986-06-05 Ibau Hamburg Ingenieurgesellschaft Industriebau Mbh, 2000 Hamburg Silo fuer schuettgut, z.b. fuer zementrohmehl

Also Published As

Publication number Publication date
EP0303864A3 (en) 1990-05-16
DE3871652D1 (de) 1992-07-09
DE3727767A1 (de) 1989-04-13
EP0303864A2 (fr) 1989-02-22
ATE76844T1 (de) 1992-06-15

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