US20100126694A1 - Silo for storing bulk products, in particular dried sludge from water treatment plants - Google Patents

Silo for storing bulk products, in particular dried sludge from water treatment plants Download PDF

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Publication number
US20100126694A1
US20100126694A1 US12/519,381 US51938107A US2010126694A1 US 20100126694 A1 US20100126694 A1 US 20100126694A1 US 51938107 A US51938107 A US 51938107A US 2010126694 A1 US2010126694 A1 US 2010126694A1
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US
United States
Prior art keywords
silo
shaft
shell
products
storage
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.)
Abandoned
Application number
US12/519,381
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English (en)
Inventor
François Sutter
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.)
Suez International SAS
Original Assignee
Degremont SA
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 Degremont SA filed Critical Degremont SA
Assigned to DEGREMONT reassignment DEGREMONT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SUTTER, FRANCOIS
Publication of US20100126694A1 publication Critical patent/US20100126694A1/en
Abandoned legal-status Critical Current

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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
    • B65D88/02—Large containers rigid
    • B65D88/06—Large containers rigid cylindrical
    • B65D88/08—Large containers rigid cylindrical with a vertical axis
    • 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
    • B65D88/74—Large containers having means for heating, cooling, aerating or other conditioning of contents
    • B65D88/744—Large containers having means for heating, cooling, aerating or other conditioning of contents heating or cooling through the walls or internal parts of the container, e.g. circulation of fluid inside the walls

Definitions

  • the invention relates to a silo for the storage of products containing organic matter, in which products self-heating occurs, the silo being of the kind of those which comprise a cylindrical or prismatic outer shell of vertical axis, having a top and a bottom, this shell being made of a thermally conductive material, especially a metallic material, and comprising at least one inlet and one outlet for the products, a roof closing the silo at the top and a discharge device closing the silo at the bottom, the silo having at least one hollow internal shaft made of a thermally conductive material, in particular a metallic material, which communicates with the atmosphere at the top and at the bottom, the internal volume of the shaft being free to allow air circulation and heat dissipation.
  • a silo of this kind is shown in documents BE 521 214 A and FR1 444 136 A.
  • the invention relates more particularly, but not exclusively, to such a silo for the storage of dried sludge from wastewater or similar treatment plants.
  • the storage capacity of current silos is limited by the self-heating of the stored product that occurs. This is because the cross section of the silos, in particular the outside diameter (excluding the wall thickness) in the case of a circular cross section, is limited owing to the self-heating of the stored product.
  • R c a critical radius that corresponds to the maximum admissible radial thickness of product in order for the heat generated by self-heating to be sufficiently discharged into the atmosphere through the mass of product and the outer shell, so as to prevent the onset of pyrolysis when the temperature rises.
  • the distance between the geometric axis of the silo and the outer surface of the shell i.e. the radius of the shell
  • R c critical radius of the product to be stored.
  • a product of critical radius R c must be stored in a silo having a radius less than or equal to R c .
  • silos for dried sludge consist of cylindrical shells some ten meters in height with an inside diameter of 2 meters or less.
  • the object of the invention is most particularly to increase the storage capacity of a silo of the kind defined above, without in any way reducing safety as regards self-heating of the stored products.
  • a silo for the storage of dried bulk products containing organic matter in particular for the storage of dried sludge from wastewater treatment plants, in which products self-heating occurs, the silo being of the kind defined above, is characterized in that the ratio d/D of the outside diameter d of the shaft to the outside diameter D of the shell is greater than 0.12.
  • a silo for the storage of dried bulk products containing organic matter in particular for the storage of dried sludge from wastewater treatment plants, in which products self-heating occurs, the silo being of the kind defined above, is characterized in that the outside diameter d of the shaft is greater than (D ⁇ 4R c ), D being the outside diameter of the shell and R c being the critical radius of the products to be stored in the silo.
  • a silo for the storage of dried bulk products containing organic matter in particular for the storage of dried sludge from wastewater treatment plants, in which products self-heating occurs, the silo being of the kind defined above, is characterized in that the shaft is in an eccentric position relative to the shell, the eccentricity of the shaft being equal to one half of its outside diameter, the critical radius R c being equal to or greater than D/4 (i.e. R c ⁇ D/4), D being the outside diameter of the shell.
  • the shell includes, on the inside at the bottom, a support means for supporting the internal shaft and suitable for this internal shaft to communicate with the atmosphere, while preventing any ingress of product into said internal shaft.
  • the means for supporting the internal shaft may be designed to allow rainwater to drain away and air to circulate.
  • the support means may comprise tubes welded to the shaft and running into this shaft, each tube passing through that wall of the shell to which it is welded and running to the outside.
  • the support means may comprise three tubes forming a tripod.
  • the diameter of the shell is at least three meters, the internal shaft having a diameter of at least one meter.
  • the internal shaft may be coaxial with the external shell.
  • the silo may comprise several internal shafts of parallel axes.
  • FIG. 1 is a schematic view, in perspective and with parts cut away, of a silo according to the invention.
  • FIG. 2 shows, in a similar manner to FIG. 1 , an alternative embodiment.
  • FIG. 1 of the drawings shows a silo S for the storage of bulk products P containing organic matter. More particularly, the products P consist of dried sludge from wastewater treatment plants. Such products undergo self-heating and may, as the temperature rises, result in the onset of pyrolysis if the heat generated is not sufficiently dissipated into the atmosphere.
  • the silo S comprises an external shell 1 , generally made of steel sheet.
  • the shell 1 may have a cylindrical shape, with a circular cross section, of vertical axis, having a top 1 a and a bottom 1 b .
  • Means for supporting this shell 1 in a vertical position are provided, but not shown in the drawings.
  • Other shapes of shells 1 are possible, for example prismatic shells.
  • the axis of the shell could be inclined relative to the vertical at an angle that does not affect the fall of the bulk product under gravity.
  • the silo is closed at the top by a roof 2 , especially one formed by a sheet metal disk, closing off the upper portion of the cylinder.
  • An inlet E for the bulk products is provided at the top, for example in the cylindrical wall of the shell 1 .
  • An outlet A for the products is provided at the bottom.
  • the silo S has at the bottom a product delivery device G formed by a concentrating cone 3 , the small base of which is downwardly directed. This small base is open and forms the outlet A.
  • the cone 3 allows the bulk product to collect at the outlet.
  • the cone 3 is equipped with a vibrating bottom 4 in order to facilitate outflow of the bulk products.
  • the silo S includes at least one hollow internal shaft 5 made of thermally conductive material, especially a metal shaft, communicating with the atmosphere at the top 5 a and at the bottom 5 b .
  • the shaft 5 is generally made of steel sheet.
  • the shaft 5 is cylindrical, of circular cross section and coaxial with the silo S.
  • the shaft 5 could have a different shape, especially a prismatic shape with a polygonal cross section.
  • the shaft 5 passes through a hole provided in the roof 2 .
  • the gap between the outline of the shaft 5 and the perimeter of the hole provided in the roof 2 may be sealed by a weld bead, which forms a mechanical link between the two components.
  • the upper end 5 a of the shaft is completely open to the atmosphere, or it may be covered with a protected grille or grating, allowing air to flow freely through it.
  • the lower portion 5 b of the shaft communicates with the atmosphere via tubes 6 welded to the lower portion of the shaft, these running into the shaft 5 .
  • the tubes 6 are downwardly inclined from the shaft, in planes passing through the axis of the shaft, and pass in a sealed manner through the wall of the cone 3 , opening to the outside.
  • Each tube 6 is fastened, in particular by welding, to the wall of the cone 3 at the orifice via which it passes through this wall, the set of tubes 6 constituting a means B for supporting the shaft 5 .
  • three tubes 6 are provided, angularly spaced apart by 120°, in order to form a tripod for supporting the shaft 5 . Any other means for supporting the shaft 5 in the silo S may be envisaged.
  • the central shaft 5 is thus open at the bottom via the tubes 6 .
  • the openings of the tubes 6 allow a natural draft to occur and rainwater to be removed.
  • the combined cross-sectional area of the tubes 6 is designed so as not to attenuate the natural draft of the shaft 5 .
  • the lower axial end of the shaft 5 is closed, for example by a disk.
  • a fan 7 may be provided in the shaft 5 , preferably at the top.
  • the height of the cylindrical part of the silo is denoted by H
  • the outside diameter of the shell 1 is denoted by D
  • the outside diameter of the shaft 5 is denoted by d.
  • the d/D ratio is preferably equal to or greater than 0.12 (i.e. d/D ⁇ 0.12).
  • the diameter d may be of the order of 1 meter, whereas the diameter D may be between 3 and 8 meters.
  • the outside diameter d of the shaft is calculated in such a way that the following safety requirement defined by the radius R c is met:
  • the shaft 5 thus created may be equipped with access means, such as a safety ladder or a spiral staircase, for installing instrumentation or equipment in the shaft.
  • access means such as a safety ladder or a spiral staircase
  • the concentric arrangement of the shaft in FIG. 1 is optimal from the mechanical strength standpoint, thanks to the concentricity of the forces on the central shaft 5 , and from the self-heating standpoint.
  • the shaft 5 ′ in an eccentric position relative to the shell 1 .
  • the top and bottom of this shaft are denoted by 5 ′ a and 5 ′ b .
  • the eccentricity of the shaft 5 ′ is equal to one half of its outside diameter, i.e. d/2.
  • the maximum distance between a point in the stored product and a wall (shell wall or shaft wall) in contact with the atmosphere is equal to D/4, i.e. one half of the radius of the external shell, since the wall of the shaft 5 ′ contains the geometric axis of the shell 1 .
  • the critical radius R c is then equal to or greater than D/4 (i.e. R c ⁇ D/4).
  • the eccentricity may take different values, but the coaxial solution remains the preferred one.
  • the axes of the shafts could be uniformly spaced over a circumference concentric with the shell 1 .
  • the invention makes it possible to increase the outside diameter of the silo, while still complying with the critical radius for self-heating.
  • the heat generated by the self-heating may be dissipated just as well by the internal shaft 5 , 5 ′ as by the external shell 1 .
  • a silo according to the invention will have a volume of 377 m 3 , as opposed to only 70.7 m 3 in the case of a conventional silo with no coaxial shaft.
  • a silo with an eccentric shaft will have a volume of 274 m 3 , as opposed to only 70.7 m 3 for a conventional silo with no shaft.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Sludge (AREA)
  • Drying Of Solid Materials (AREA)
  • Storage Of Harvested Produce (AREA)
US12/519,381 2006-12-18 2007-12-14 Silo for storing bulk products, in particular dried sludge from water treatment plants Abandoned US20100126694A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0611015A FR2909984B1 (fr) 2006-12-18 2006-12-18 Silo pour le stockage de produits en vrac, notamment des boues sechees de stations d'epuration.
FRFR0611015 2006-12-18
PCT/FR2007/002075 WO2008087301A2 (fr) 2006-12-18 2007-12-14 Silo pour le stockage de produits en vrac, notamment des boues sechees de stations d'epuration

Publications (1)

Publication Number Publication Date
US20100126694A1 true US20100126694A1 (en) 2010-05-27

Family

ID=38157860

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/519,381 Abandoned US20100126694A1 (en) 2006-12-18 2007-12-14 Silo for storing bulk products, in particular dried sludge from water treatment plants

Country Status (8)

Country Link
US (1) US20100126694A1 (fr)
EP (1) EP2094588A2 (fr)
CN (1) CN101563277A (fr)
BR (1) BRPI0721353A2 (fr)
CA (1) CA2672774A1 (fr)
FR (1) FR2909984B1 (fr)
RU (1) RU2009127804A (fr)
WO (1) WO2008087301A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010027679A1 (de) * 2010-07-20 2012-01-26 Osram Opto Semiconductors Gmbh Optoelektronisches Bauelement
EP3733558B1 (fr) * 2019-05-03 2022-01-26 Color Service S.r.l. Unité de dosage pour systèmes de pesage automatiques

Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1542188A (en) * 1923-11-16 1925-06-16 Joseph E Nelson & Sons Tank
US1988184A (en) * 1933-10-23 1935-01-15 Dravo Contracting Company Bin structure
US2247608A (en) * 1939-02-16 1941-07-01 Groff Andrew H De Rain water container
US2641174A (en) * 1948-09-29 1953-06-09 Oberlin Carl Apparatus for storing hay
GB710401A (en) * 1951-12-28 1954-06-09 Emile Poiraud Improvements in or relating to ventilation devices for grain silos
US2777295A (en) * 1952-09-12 1957-01-15 Union Carbide & Carbon Corp Concrete reservoir for liquefied gases
US3165304A (en) * 1963-01-14 1965-01-12 Harbison Walker Refractories Shaft kiln
US3593892A (en) * 1968-02-26 1971-07-20 Petit Georges L H Construction of silos
US3658211A (en) * 1970-06-16 1972-04-25 W M Kitchens Fertilizer distributor tank
US4602465A (en) * 1983-07-19 1986-07-29 Jansens & Dieperink B.V. Supporting structure for large volume containers
US4606158A (en) * 1983-11-24 1986-08-19 Claudius Peters Aktiengesellschaft Double silo
US4699292A (en) * 1986-08-20 1987-10-13 Westvaco Corporation Pulp bleaching tower pressure relief hatch
US4718208A (en) * 1985-12-03 1988-01-12 Jansens & Dieperink Bv Method of making large-volume containers, individual segments to be used therefor, and aligning tool for aligning the same
US4887400A (en) * 1988-06-10 1989-12-19 Carroll Michael W Granular material storage system
US5239920A (en) * 1991-06-24 1993-08-31 Schuff David A Can crusher apparatus
US5570547A (en) * 1995-03-02 1996-11-05 Long Manufacturing North Carolina, Inc. Grain feed tank with swinging cap
US5586678A (en) * 1994-11-04 1996-12-24 Tic United Corp. Bulk hopper tank lid opener assembly
US7487619B2 (en) * 2006-09-12 2009-02-10 Glenn Roy D Water tank

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE521214A (fr) *
FR1444136A (fr) * 1965-05-11 1966-07-01 Perfectionnements aux silos pour le stockage des produits pulvérulents et notamment du ciment
DE1559202A1 (de) * 1965-10-09 1969-09-04 Bernhard Kleinhammer Transportabler Kleinsilo
FR2286682A1 (fr) * 1974-10-01 1976-04-30 Bonvillain Et E Ronceray Ets Elevateur-refroidisseur pour sable sec de fonderie
JPS6367282A (ja) * 1986-09-04 1988-03-26 清水建設株式会社 粉粒物の冷却貯蔵サイロ

Patent Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1542188A (en) * 1923-11-16 1925-06-16 Joseph E Nelson & Sons Tank
US1988184A (en) * 1933-10-23 1935-01-15 Dravo Contracting Company Bin structure
US2247608A (en) * 1939-02-16 1941-07-01 Groff Andrew H De Rain water container
US2641174A (en) * 1948-09-29 1953-06-09 Oberlin Carl Apparatus for storing hay
GB710401A (en) * 1951-12-28 1954-06-09 Emile Poiraud Improvements in or relating to ventilation devices for grain silos
US2777295A (en) * 1952-09-12 1957-01-15 Union Carbide & Carbon Corp Concrete reservoir for liquefied gases
US3165304A (en) * 1963-01-14 1965-01-12 Harbison Walker Refractories Shaft kiln
US3593892A (en) * 1968-02-26 1971-07-20 Petit Georges L H Construction of silos
US3658211A (en) * 1970-06-16 1972-04-25 W M Kitchens Fertilizer distributor tank
US4602465A (en) * 1983-07-19 1986-07-29 Jansens & Dieperink B.V. Supporting structure for large volume containers
US4606158A (en) * 1983-11-24 1986-08-19 Claudius Peters Aktiengesellschaft Double silo
US4718208A (en) * 1985-12-03 1988-01-12 Jansens & Dieperink Bv Method of making large-volume containers, individual segments to be used therefor, and aligning tool for aligning the same
US4699292A (en) * 1986-08-20 1987-10-13 Westvaco Corporation Pulp bleaching tower pressure relief hatch
US4887400A (en) * 1988-06-10 1989-12-19 Carroll Michael W Granular material storage system
US5239920A (en) * 1991-06-24 1993-08-31 Schuff David A Can crusher apparatus
US5586678A (en) * 1994-11-04 1996-12-24 Tic United Corp. Bulk hopper tank lid opener assembly
US5570547A (en) * 1995-03-02 1996-11-05 Long Manufacturing North Carolina, Inc. Grain feed tank with swinging cap
US7487619B2 (en) * 2006-09-12 2009-02-10 Glenn Roy D Water tank

Also Published As

Publication number Publication date
CA2672774A1 (fr) 2008-07-24
FR2909984B1 (fr) 2010-12-10
FR2909984A1 (fr) 2008-06-20
WO2008087301A2 (fr) 2008-07-24
WO2008087301A3 (fr) 2008-09-12
CN101563277A (zh) 2009-10-21
EP2094588A2 (fr) 2009-09-02
BRPI0721353A2 (pt) 2014-02-25
RU2009127804A (ru) 2011-01-27

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Date Code Title Description
AS Assignment

Owner name: DEGREMONT, FRANCE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SUTTER, FRANCOIS;REEL/FRAME:023605/0834

Effective date: 20090904

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION