EP2106294B1 - Appareil de sélection granulométrique et/ou de séchage de matière - Google Patents

Appareil de sélection granulométrique et/ou de séchage de matière Download PDF

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Publication number
EP2106294B1
EP2106294B1 EP07870307A EP07870307A EP2106294B1 EP 2106294 B1 EP2106294 B1 EP 2106294B1 EP 07870307 A EP07870307 A EP 07870307A EP 07870307 A EP07870307 A EP 07870307A EP 2106294 B1 EP2106294 B1 EP 2106294B1
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EP
European Patent Office
Prior art keywords
gas
matter
pipe
selector
inlet
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Active
Application number
EP07870307A
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German (de)
English (en)
French (fr)
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EP2106294A2 (fr
Inventor
Sébastien DEVROE
Alain Cordonnier
Pascal Marechal
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.)
Fives FCB SA
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Fives FCB SA
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Priority to PL07870307T priority Critical patent/PL2106294T3/pl
Publication of EP2106294A2 publication Critical patent/EP2106294A2/fr
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Publication of EP2106294B1 publication Critical patent/EP2106294B1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/02—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall

Definitions

  • the present invention relates to an apparatus for granulometric selection and / or material drying, for the suspension treatment of granular mineral materials of which at least 90% by weight have a size less than 60 mm.
  • these devices are not considered granulometric selectors. Indeed, when these devices are loaded with a coarse fraction composed of particles of various diameters, generally, most of the fraction falls, without separation and suspension of the finest particles that compose it.
  • the document device GB-2,193,448 which corresponds to the preamble of claim 1 comprises a substantially vertical pipe, upflow, provided with a gas inlet at its base, equipped with an upper opening through which the fines escape and a lower opening by which drop the coarse materials.
  • the feed of the materials is at a point of introduction between the upper opening and the lower opening.
  • the pipe of the apparatus is equipped with funnels distributed over the height of the pipe, and in particular below the point of introduction, intended to divert the materials of the internal walls of the pipe.
  • This apparatus is also equipped with means for creating a vortex, constituted by fixed propellers, distributed over the height of the pipe.
  • Vertical plates arranged between the funnels and the propellers, are intended to create turbulence allowing the disintegration of agglomerated materials.
  • the object of the present invention is to provide an apparatus for granulometric selection and / or drying of pulverulent materials, for the suspension treatment of granular mineral materials of which at least 90% by weight are less than 60 mm in size, which operates in line and stably for application to materials with a wide particle size spectrum.
  • Another object of the invention is to provide a particle size selection apparatus and / or drying allowing a good separation of fractions, which can be resuspended.
  • Another object of the invention is to provide an apparatus for granulometric selection and / or drying of pulverulent materials, consisting mainly of a vertical gas pipe of small size, especially of height substantially less than the height of the gas pipe. flash type drying apparatus known to those skilled in the art.
  • Another object of the invention is to provide an apparatus for granulometric selection and / or drying of pulverulent materials, operating with the aid of an ascending flow of gas whose speed is much lower than the speed of the upward flow of gas. flash drying apparatus known to those skilled in the art, thus reducing the pressure drop.
  • the apparatus relates to an apparatus for granulometric selection and / or drying of pulverulent materials, for the suspension treatment of granular mineral matter of which at least 90% by weight is less than 60 mm in size, the apparatus consisting mainly of a substantially vertical upflow gas line provided with a gas inlet at its base, equipped with a lower opening and an upper opening between which a supply opening is also provided for the introduction of materials, in which apparatus a part of the material, in particular said fine, can escape with the gas through the upper opening through the lift of said upward flow, while another part of matter, more coarse, is not driven by said gas and falls through the lower opening, the apparatus has, in addition, means for creating turbulence, favorable to the separation of different size fractions and the suspension of the materials, provided at the inner wall of the gas pipe, and located between the lower opening and the supply opening of said pipe.
  • the means for creating turbulence are formed at least in part, by obstacles for the upward gas flow, in the form of generally horizontal blades, fixed against the inner wall of said gas pipe, of length oriented towards the center of the gas pipe, and arranged at least on two successive levels of height, distributed angularly staggered between said at least two successive levels of height, with the possible lateral overlapping areas.
  • the apparatus for selecting granulometric and / or drying pulverulent materials differs from the known "flash" type drying systems, which comprise as a main element for suspending materials, a venturi in the where the speed of the gases is raised between 30 and 40 m / s.
  • the construction of the venturi forces a total height of the device which is 5 to 6 times the value of the diameter of the vertical pipe.
  • the apparatus for granulometric selection and / or drying of pulverulent materials, according to the invention, is intended for the suspension treatment of granular mineral materials of which at least 90% by weight have a size of less than 60 mm.
  • the apparatus consists mainly of a gas pipe 1, substantially vertical, upflow Fa, provided with a gas inlet at its base.
  • This pipe may be of substantially circular elliptical or rectangular section.
  • the form factor that is to say the length / width ratio of the dimensions of the section does not exceed three.
  • This pipe is equipped with a lower opening 2, and an upper opening 3, between which a feed opening 4 is also provided for the introduction of materials.
  • the lower opening 2 can be fed with gas including a plenum 7 also called wind box.
  • Part of the granular mineral matter, in particular so-called “fines”, can escape with the gas through the upper opening 3 thanks to the lift of the upward flow Fa, while another part of the materials, more coarse, is not driven by the gas and falls through the lower opening 2.
  • the apparatus 30 has, in addition, means 5 for creating turbulence, favorable to the separation of the different particle size fractions, as well as to the suspension of the materials, provided at the level of the internal wall of the gas pipe 1 and located between the lower opening 2 and the feed opening 4 of the gas pipe 1.
  • the turbulences allow in particular the separation of the particles of various diameters, a coarse fraction of material, thus allowing the suspension and the evacuation by the upper opening 3 of the so-called “fine” particles of this fraction, and the larger particles fall through the opening 2.
  • the means 5 for creating the turbulences may consist, at least in part, of obstacles for the upward gas flow Fa, located against the inner wall of the gas pipe 1.
  • the obstacles may take the form of generally horizontal blades, whose length is oriented towards the center of the gas pipe 1.
  • the blades can be arranged at least in two successive levels of height, as illustrated in particular in the figure 1 .
  • the blades may be arranged angularly staggered between two successive levels of height, with, where appropriate, lateral overlapping zones, forcing in particular the flow of ascending gas to zigzag between the blades of different levels.
  • the length of each blade can represent between 2 and 30% of the free width of the conduct 1 along the axis of the blade.
  • the sum of the widths of each blade in particular disposed at least at two successive levels of height may represent at least 60% of the peripheral length of the pipe.
  • the sum of the widths of the blades may advantageously be between 120% and 200% of the peripheral length of the pipe.
  • the shape and position of the blades 10 in the gas pipe 1 may be favorable to an accumulation of materials, including stagnant, on top of said blades 10 during operation, to protect said blades against erosion.
  • the blade may be of concave shape on the blade top or may have one or more upper flanges, in particular at the end of blades 13.
  • the end 13 may be protected by a harder material, the pipe 1 may be covered with a material 12 of protection against abrasion.
  • the means 5 for creating turbulence may be constituted, at least in part, by at least one wall gas flow Fp, oriented generally perpendicular to the direction of the ascending flow Fa penetrating notably radially or tangentially in the internal volume of the gas pipe 1 through the wall orifices 8 of said gas pipe 1.
  • the surface sum of the orifices 8 may represent between 15% and 150% of the free section of the pipe 1.
  • the apparatus may have at least one plenum 7 surrounding the lower part of the pipe, for supplying gas to the lower opening 2 of the gas inlet and / or where appropriate the orifices 8 of the walls of the pipe.
  • the gas inlet may consist solely of the lower opening 2.
  • the gas inlet of the pipe is constituted by the lower opening 2 and the wall openings 8.
  • the gas supply is constituted solely by the wall orifices 8.
  • the plenum 7 can be in the form of a box having an evacuation outlet 9 for falling materials, as illustrated in particular in FIG. figure 1 or 2 .
  • the plenum 7 can be supplied with gas via at least one radial gas inlet 6, 6-1 and / or at least one tangential gas inlet 6-2, 6-3.
  • the plenum chamber 7 is fed by one or two radial inlets 6; 6, 6-1.
  • the plenum chamber 7 is fed by one or two tangential inlets 6-2; 6-2, 6-3.
  • the exemplary embodiment illustrated in figure 1 comprises mainly a gas pipe 1 having an upper opening 3, a lower opening 2 also constituting a main gas inlet.
  • the means 5 for creating turbulence are constituted, on the one hand, by obstacles constituted by blades 10, distributed in several successive height levels and angularly arranged in staggered rows in two successive levels of height, and on the other hand, by wall openings 8 passing through the wall gas flows Fp.
  • a single plenum will surround the lower part of the pipe and can supply gas, on the one hand, the orifices 8, and on the other hand the lower opening 2.
  • This apparatus can be implemented with a gas pipe whose length does not exceed 4 to 5 times the value of the diameter.
  • the speed of the upward flow of gas can be 15 m / s.
  • the topics have a maximum grain size of 100 mm at a specific concentration of between 5 and 6 kg / kg of gas.
  • the installation can operate without instability and selects materials such that only particles smaller than about 0.8 mm are flown and particles larger than about 2 mm fall.
  • the resulting pressure drop is of the order of 60% compared to the "flash" type drying system known from the state of the art for the same flow of material.
  • the example of figure 2 differs from the example of the figure 1 in that the lower opening 2 is of smaller diameter than the largest section of the gas pipe 1, formed at the end of a truncated cone.
  • figure 3 describes an apparatus in which all the gases are introduced through the wall openings 8 and not through the lower opening 2.
  • the sum of the wall flows Fp then allows the creation of the upflow Fa.
  • the wall orifices 8 are located , in large part, below the level of blades 10 constituting obstacles for the upward flow Fa.
  • the raw material fed into the apparatus forming the subject of the invention has a particle size such that 50% of the grains are smaller (or greater) than 3.2 mm with 10% greater than a mesh of 15 mm and a maximum size of 35 mm. mm.
  • the specific feed rate is 5 to 6 kg / kg of gas.
  • the material flown to the exit 3 has a particle size such that almost all the grains have a size less than 7 mm with 50% lower (or higher) than 0.48 mm.
  • the material falling through the lower opening 2 is such that almost all the grains have a size greater than 0.15 mm with 50% lower (or higher) than 5 mm.
  • the separation curve that expresses the split ratio between the two streams for each grain size has a steep slope between grain sizes of 0.7 mm where only 20% of the material falls back and 3 mm where 90% of the materials fall back. This steep slope expresses a high power of selection.
  • the invention will also relate to a drying installation comprising an apparatus according to the invention, the gas inlet of which is fed by a source of gas in temperature.
  • the figure 6 Non-exhaustively illustrates a grinding plant incorporating a device 30 for selecting granulometric and drying. This facility processes materials 17, 18 at least one of which is wet.
  • the plant which processes the materials comprises a grinder 15, a dynamic selector 16, a filter 21 which collects the ground finished product, and material handling means such as a bucket chain or other conveyors, as well as ventilation means for the gases.
  • This plant receives hot gases from an undescribed source.
  • the material feed 17 feeds the mill 15, and the product 19 leaving the mill is fed to the selector 16.
  • the fine fraction is the finished product collected at 21 and the coarse fraction is returned to the mill.
  • the hot gases 20 feed the mill 15, the dryer selector 22 and the dynamic selector 16.
  • the particle size selection and drying apparatus 30 is located on the path of the gas supplying the dynamic selector 16 to which it is connected via its gas line 1.
  • the apparatus receives the hot gases through the inlet 6 and is fed by a supply of material 18 to perform the drying more effectively than if this material was fed directly to the mill 15.
  • the thinnest fraction continues to the dynamic selector 16 in the gas path while the coarse fraction returns through the outlet 9 to the mill 15 at the same time as the rejection 23 of the selector.
  • the refusal can be carried out by a refusal line 23 'of the dynamic selector 16 disposed internally to the gas line 1 of the apparatus 30 of the dryer selector 22, said refusal line 23' opening below or at near the exit 9 of said selector dryer 22.
  • the selector dryer 22 can make it possible to select the material whose grain size is less than about one millimeter, the dynamic selector 16 allowing the selection of material whose grain size is less than one hundred or even ten micrometers.
  • the particle size selection operated by the apparatus 22 avoids both the dynamic selector 16 to be overloaded in coarse fractions from the suspension drying step of a conventional "flash" type system, and the grinder 15. be overloaded in fine fractions if the new material supplied by the feed 18 contains a significant amount. If the drying capacity of the mill 15 is low, the material 19 leaving the mill can be divided into two streams 19-1 and 19-2, the second being again subjected to the fast drying step.

Landscapes

  • Drying Of Solid Materials (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Crushing And Grinding (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Glanulating (AREA)
  • Compositions Of Oxide Ceramics (AREA)
EP07870307A 2006-11-20 2007-11-20 Appareil de sélection granulométrique et/ou de séchage de matière Active EP2106294B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07870307T PL2106294T3 (pl) 2006-11-20 2007-11-20 Urządzenie do separacji granulometrycznej i/lub do suszenia materiału

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0610144A FR2908673B1 (fr) 2006-11-20 2006-11-20 Appareil de selection granulometrique et/ou de sechage de matiere.
PCT/FR2007/001901 WO2008068432A2 (fr) 2006-11-20 2007-11-20 Appareil de sélection granulométrique et/ou de séchage de matière

Publications (2)

Publication Number Publication Date
EP2106294A2 EP2106294A2 (fr) 2009-10-07
EP2106294B1 true EP2106294B1 (fr) 2012-03-14

Family

ID=38120376

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07870307A Active EP2106294B1 (fr) 2006-11-20 2007-11-20 Appareil de sélection granulométrique et/ou de séchage de matière

Country Status (14)

Country Link
US (1) US8245963B2 (zh)
EP (1) EP2106294B1 (zh)
JP (1) JP5497443B2 (zh)
CN (1) CN101583429B (zh)
AT (1) ATE549088T1 (zh)
CA (1) CA2670906C (zh)
DK (1) DK2106294T3 (zh)
ES (1) ES2384402T3 (zh)
FR (1) FR2908673B1 (zh)
MX (1) MX2009005334A (zh)
PL (1) PL2106294T3 (zh)
RU (1) RU2445174C2 (zh)
UA (1) UA95818C2 (zh)
WO (1) WO2008068432A2 (zh)

Families Citing this family (7)

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FR2959679B1 (fr) 2010-05-05 2015-02-20 Fives Fcb Procede de broyage d'une matiere minerale contenant au moins du calcium et des impuretes metalliques, et installation convenant pour le broyage d'une matiere minerale contenant du calcium et des impuretes metalliques en tant que tels.
JP5179540B2 (ja) * 2010-05-20 2013-04-10 株式会社キンキ 粉砕乾燥機とそれを備えた粉砕・乾燥設備
DE102010054849A1 (de) * 2010-12-17 2012-06-21 Zeppelin Systems Gmbh Verfahren und Vorrichtung zur Abscheidung von feinen Partikeln aus granulatförmigen Schüttgütern in einer Rohrleitung
CN104990390A (zh) * 2015-07-30 2015-10-21 天能水泥有限责任公司 干排电石渣干燥和硅铁收集方法及***
CN109012888A (zh) * 2018-10-26 2018-12-18 南京中材粉体工程科技有限公司 一种辊式立磨
CN112742049B (zh) * 2019-10-30 2022-04-08 中国石油化工股份有限公司 旋转闪蒸干燥机
CN114226248B (zh) * 2021-11-16 2022-11-18 太原理工大学 循环流化床燃煤灰渣分质分级的处理方法

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Also Published As

Publication number Publication date
RU2445174C2 (ru) 2012-03-20
WO2008068432A2 (fr) 2008-06-12
PL2106294T3 (pl) 2012-08-31
FR2908673B1 (fr) 2009-11-06
EP2106294A2 (fr) 2009-10-07
FR2908673A1 (fr) 2008-05-23
CN101583429A (zh) 2009-11-18
CA2670906A1 (fr) 2008-06-12
US8245963B2 (en) 2012-08-21
CA2670906C (fr) 2012-01-10
UA95818C2 (ru) 2011-09-12
DK2106294T3 (da) 2012-06-18
ES2384402T3 (es) 2012-07-04
RU2009123505A (ru) 2010-12-27
ATE549088T1 (de) 2012-03-15
WO2008068432A3 (fr) 2008-08-07
JP5497443B2 (ja) 2014-05-21
US20100133369A1 (en) 2010-06-03
CN101583429B (zh) 2011-11-16
MX2009005334A (es) 2009-09-02
JP2010510468A (ja) 2010-04-02

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