EP1707909A2 - Percolation de matériau hygroscopique en vrac - Google Patents

Percolation de matériau hygroscopique en vrac Download PDF

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Publication number
EP1707909A2
EP1707909A2 EP06007073A EP06007073A EP1707909A2 EP 1707909 A2 EP1707909 A2 EP 1707909A2 EP 06007073 A EP06007073 A EP 06007073A EP 06007073 A EP06007073 A EP 06007073A EP 1707909 A2 EP1707909 A2 EP 1707909A2
Authority
EP
European Patent Office
Prior art keywords
product
pile
air
caking
percolation
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Withdrawn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
EP06007073A
Other languages
German (de)
English (en)
Other versions
EP1707909A3 (fr
Inventor
Werner Soyez
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.)
Qatar Fertiliser Co (saq)
Original Assignee
Qatar Fertiliser Co (saq)
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 Qatar Fertiliser Co (saq) filed Critical Qatar Fertiliser Co (saq)
Publication of EP1707909A2 publication Critical patent/EP1707909A2/fr
Publication of EP1707909A3 publication Critical patent/EP1707909A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
    • F26B9/10—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in the open air; in pans or tables in rooms; Drying stacks of loose material on floors which may be covered, e.g. by a roof
    • F26B9/103—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in the open air; in pans or tables in rooms; Drying stacks of loose material on floors which may be covered, e.g. by a roof using fixed or removable drying air channels placed in the stack, e.g. horizontally or vertically

Definitions

  • the field of invention applies to all hygroscopic organic and inorganic particulates prone to caking and agglomeration.
  • the invention is a simple, efficient and cheap way of upgrading product behavior during bulk storage preventing caking and re-caking from occurring.
  • Inorganic salts such as phosphates, carbonates, sulfates, nitrates, nitrites, etc. but also organic compounds such as urea, flour, sugar etc. and blends thereof are generally prone to caking. Caking complicates loading, bagging, spreading, dissolution and other activities associated with bulk material handling and storage. Mechanical breaking of resulting lumps leads to dust and fines formation, which in turn increases handling problems as well as the re-caking tendency of the product.
  • the finishing stage of any standard solidification unit leads to a product with a certain moisture level being a function of the product temperature, the moisture in the drying medium and the approach to the hygroscopic equilibrium.
  • the moisture level in the product is above -or at best- close to the so-called "Critical Moisture”.
  • This critical moisture defines the particular pressure of H 2 O in the ambient atmosphere around the single granule/crystal or particle. It is the partial pressure of H 2 O, at which moisture release from the product and moisture absorption by the product are exactly in balance.
  • the product Once the product has left the final stage of production, it is usually conveyed into a bulk hall. There, the single particle becomes an element of the pile. From pile temperature measurements we know, that only the outer layer (some 50 cm depth) reacts to the changes in the bulk hall ambient conditions. The rest of the material does not respond at all and is only exposed to the microclimate around the single product particle, sealed inside the pile.
  • void space consists of air and moisture at a certain humidity level, which is at or above the Critical Humidity. Since due to production constraints, residence times are never sufficient to allow particulates to completely stabilize, the product temperature and the elevated moisture content create a microclimate around the single particle inside the pile, which is optimal for bridging between particles and finally for caking.
  • the proposed solution is to draw-up a process minimizing that ongoing, self-propagating bridging by replacing the humid microclimate inside the bulk material with a dryer one, thus hindering the cycle of moisture release, crystal growth, bridging, and moisture pick-up.
  • This can be performed by percolating a pile of bulk material with a sufficiently dried air flow, injected and distributed for example by a simple system at the bottom of the pile, comprising for example a single twisting tube running at the bottom of the pile or a grid of tubes spreading at the bottom of the pile, with holes to allow dry air to flow.
  • the sketch presented in figure 1 represents a pile 4 of bulk hygroscopic particulate material.
  • a percolation grid is represented in the form of tubes 3 spreading at the bottom of the pile 4 with holes to allow dry air to flow through the enclosed core of the pile replacing the humidity entrapped in the void between the particles.
  • the dry air is delivered to the interspersed tubes 3 through a header 2.
  • the dry air source 1 may be any excess working air available in the plant or a dedicated dry air source.
  • the invention includes a grid of tubes 3 that could be arranged in a number of ways to maximize distribution of dry air at the bottom of a pile 4 of hygroscopic particulate material.
  • the distribution of the holes on the tubes 3 should account for the shape of the pile 4 and the required amount of dry air needed per ton of material. If the bulk hall to be percolated is too large for one grid to be efficient, then air should be distributed using a number of grids connected through a header. If the amount of dry air needed is too large, then separate grids should be used to percolate sections of the bulk hall intermittently. The flow of dry air should be minimized since the diffusion of moisture from the inside of the particle to the void space in the pile is a very slow process.
  • Example 1 Percolation of urea granules in bulk hall storage.
  • Example 2 Percolation of urea granules in bulk hall storage.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Packages (AREA)
EP06007073A 2005-04-02 2006-04-03 Percolation de matériau hygroscopique en vrac Withdrawn EP1707909A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GCP20054504 2005-04-02

Publications (2)

Publication Number Publication Date
EP1707909A2 true EP1707909A2 (fr) 2006-10-04
EP1707909A3 EP1707909A3 (fr) 2007-11-14

Family

ID=36608620

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06007073A Withdrawn EP1707909A3 (fr) 2005-04-02 2006-04-03 Percolation de matériau hygroscopique en vrac

Country Status (2)

Country Link
EP (1) EP1707909A3 (fr)
EG (1) EG24340A (fr)

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1647863A (en) * 1927-03-11 1927-11-01 Harry F Galbraith Apparatus and method for curing legume
GB493993A (en) * 1938-01-26 1938-10-18 August Gronert Improvements in and relating to ventilating or drying devices suitable for treating crops
US2703936A (en) * 1951-11-13 1955-03-15 Roelf W Hut Apparatus for feeding and guiding coarse solid materials
FR1219793A (fr) * 1959-04-07 1960-05-19 Installation de ventilation, notamment pour l'assèchement des grains
DE1778238A1 (de) * 1968-04-10 1971-03-25 Wieneke Franz Anlage zur Trocknung landwirtschaftlicher Produkte
GB2095805A (en) * 1981-03-27 1982-10-06 Boswell Alexander Bruce Ducting for drying grain
FR2628517A1 (fr) * 1988-03-11 1989-09-15 Inor Installation de traitement de dechets, essentiellement organiques tels qu'ordures menageres, comportant des moyens de deshumidification de ceux-ci en vue de realiser un stockage sans nuisance desdits dechets organiques
FR2675981A1 (fr) * 1991-05-03 1992-11-06 Gaillan Robert Gaine de ventilation des cereales munie de diffuseurs d'air.
EP0835856A2 (fr) * 1996-10-09 1998-04-15 Thöni Industriebetriebe Gesellschaft m.b.H. Procédé et installation de traitement des matières en vrac actives biologiquement disposées en tas sur une surface de sol
EP0936430A1 (fr) * 1998-02-16 1999-08-18 Eric Julien Verheecke Procédé et dispositif de contrÔle de la teneur en eau de produits stockés dans une enceinte
WO2001006190A1 (fr) * 1999-07-21 2001-01-25 Myla Limited Procede et dispositif servant a transporter un milieu liquide vers ou depuis une masse discrete supportee sur un sol
FR2828989A1 (fr) * 2001-08-31 2003-03-07 Jean Marie Courtois Enceinte de stockage temporaire de produits du type granuleux

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1647863A (en) * 1927-03-11 1927-11-01 Harry F Galbraith Apparatus and method for curing legume
GB493993A (en) * 1938-01-26 1938-10-18 August Gronert Improvements in and relating to ventilating or drying devices suitable for treating crops
US2703936A (en) * 1951-11-13 1955-03-15 Roelf W Hut Apparatus for feeding and guiding coarse solid materials
FR1219793A (fr) * 1959-04-07 1960-05-19 Installation de ventilation, notamment pour l'assèchement des grains
DE1778238A1 (de) * 1968-04-10 1971-03-25 Wieneke Franz Anlage zur Trocknung landwirtschaftlicher Produkte
GB2095805A (en) * 1981-03-27 1982-10-06 Boswell Alexander Bruce Ducting for drying grain
FR2628517A1 (fr) * 1988-03-11 1989-09-15 Inor Installation de traitement de dechets, essentiellement organiques tels qu'ordures menageres, comportant des moyens de deshumidification de ceux-ci en vue de realiser un stockage sans nuisance desdits dechets organiques
FR2675981A1 (fr) * 1991-05-03 1992-11-06 Gaillan Robert Gaine de ventilation des cereales munie de diffuseurs d'air.
EP0835856A2 (fr) * 1996-10-09 1998-04-15 Thöni Industriebetriebe Gesellschaft m.b.H. Procédé et installation de traitement des matières en vrac actives biologiquement disposées en tas sur une surface de sol
EP0936430A1 (fr) * 1998-02-16 1999-08-18 Eric Julien Verheecke Procédé et dispositif de contrÔle de la teneur en eau de produits stockés dans une enceinte
WO2001006190A1 (fr) * 1999-07-21 2001-01-25 Myla Limited Procede et dispositif servant a transporter un milieu liquide vers ou depuis une masse discrete supportee sur un sol
FR2828989A1 (fr) * 2001-08-31 2003-03-07 Jean Marie Courtois Enceinte de stockage temporaire de produits du type granuleux

Also Published As

Publication number Publication date
EP1707909A3 (fr) 2007-11-14
EG24340A (en) 2009-02-09

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