WO1988004020A1 - Dispositif de sechage pour materiau granulaire - Google Patents

Dispositif de sechage pour materiau granulaire Download PDF

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Publication number
WO1988004020A1
WO1988004020A1 PCT/SE1987/000550 SE8700550W WO8804020A1 WO 1988004020 A1 WO1988004020 A1 WO 1988004020A1 SE 8700550 W SE8700550 W SE 8700550W WO 8804020 A1 WO8804020 A1 WO 8804020A1
Authority
WO
WIPO (PCT)
Prior art keywords
drying
drying chamber
drying gas
situated
material supply
Prior art date
Application number
PCT/SE1987/000550
Other languages
English (en)
Inventor
Stefan J. Moszkowski
Original Assignee
Moszkowski Stefan J
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 Moszkowski Stefan J filed Critical Moszkowski Stefan J
Publication of WO1988004020A1 publication Critical patent/WO1988004020A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/10—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers
    • F26B17/107—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers pneumatically inducing within the drying enclosure a curved flow path, e.g. circular, spiral, helical; Cyclone or Vortex dryers

Definitions

  • the invention relates to an apparatus for drying granular or pulverulant material, namely an apparatus of the kind disclosed in the preamble to claim 1.
  • Such apparatuses are already known, e.g. from the US-A- 3 600 817 and SE-B-369 958. Particularly with drying sticky material, e.g. moist sand, it is difficult to ensure uniform distribution of the particles in the drying chamber and to avoid agglomeration into larger aggregates .
  • drying sticky material e.g. moist sand
  • the main object of the invention is to avoid these draw ⁇ backs and enable effective drying, even if the material is sticky.
  • a further object is to enable effective drying in spite of relatively low temperature in the drying gas, whereby energy and costs are saved while at the same time it becomes possible to dry material which is sensitive to over-heating, e.g. chemical granulates.
  • the drying gas inlet aperture comprises an elongate gap and the material supply opening is placed peripherally adjacent this gap.
  • the drying gas inlet aperture extends along the major portion of the drying chamber length, while the material supply opening is restricted to one of the end portions of the drying chamber.
  • the tangentially inflowing air coacts effectively with the supplied material particles, so that during the drying action the latter are caused directly to be entrained in a helical movement and axial conveyance towards the other end portion, where they are separated from the drying gas.
  • the drying gas flows in tangentially to mix directly with the material particles, thus preventing that the particles adhere to the inside of the drying chamber wall, since the drying gas flows substantially uniformly along the entire inside surface of the drying chamber and has a rather high peripheral speed, which ensures that the particles are kept suspended in the drying gas flow without being deposited on the drying chamber wall or agglomerating into larger aggregates.
  • New air (or other drying gas) is supplied along the entire length of the drying chamber, while air which has taken up moisture from the particles flows spirally in towards the centre simultaneously as there is axial conveyance towards the separation end.
  • This action is particularly effective if a subpressure is maintained in the drying chamber, the mentioned gap then constituting a suction gap, as disclosed in claim 2.
  • an additional suction aperture for surrounding air is arranged in an end wall of the drying chamber at the material feed end, since this results in an axial velocity component directed towards the discharge end and counteracts collection of particles at the end wall.
  • FIG. 1 is a schematic side view, partially sectioned, of drying apparatus in accordance with the invention
  • l ⁇ igure 2 is a perspective view of the drying apparatus in Figure 1
  • Figure 3 is a plan of the drying apparatus according to
  • Fig. 1 also schematically illustrating an associated fan system.
  • Figure 4 is a cross-section to a larger scale along the line IV-IV in Fig. 1 and illustrates the material supply opening and drying gas inlet aperture of the apparatus
  • Figure 5 is a cross-section corresponding to the one in Fig. 4, but of a modified embodiment
  • Figures 6a, 6b and 6c illustrate a material supply means according to Figs. 1-4 in side view, end view and plan
  • Figure 7 is a perspective view of a further embodiment with a material supply means in the form of a conveyer belt
  • Figure 8 is a cross-section corresponding to the ones in Figs. 4 and 5, but of the embodiment according to Fig. 7, and
  • Figure 9 illustrates a still further embodiment with drying chambers placed one after the other.
  • the drying apparatus illustrated in Figures 1-3 essential ⁇ ly comprises a horizontally arranged, substantially cylindr ⁇ ical drying chamber 1 , a material supply means 2 arranged at one end portion of the drying chamber, to the left in Figure 1 , the means being arranged for feeding granular or pulverulant material, e.g.
  • a drying gas or air supply means in the form of a plenum chamber 3 communicating with the drying chamber via an elongate, axial gap 4, a cyclone separator 5 arranged at the other end portion of the drying chamber, to the right in Figure 1, where dried material is released by the upwardly outflowing gas for downward discharge, and an air cirulation system (see Figure 3) connected to the air inlet 3a of the plenum chamber 3 and the air outlet 5a of the separator 5, the system also including a suction fan 7 arranged in an outlet duct 6 from the separator 5, a heat exchanger 9 (or heat pump) between the outlet duct 6 and an inlet duct 8 connected to the inlet 3a and an additional heater battery 10 arranged downstream of the heat exchanger 9 in the inlet duct 8.
  • a suction fan 7 arranged in an outlet duct 6 from the separator 5
  • a heat exchanger 9 or heat pump
  • Air (or other drying gas) is thus urged by the fan 7 in the direction of the arrows, the air on the fan inlet side being preheated in the exchanger 9 and is further heated to desired temperature by the heater battery TO before it flows via the plenum chamber 3 to the drying chamber 1.
  • the temperature of the air sucked in can be adjusted or regulated with regard to the moisture content of the material to be dried and to the through-flow.
  • the implemen ⁇ tation is such that a relatively low excess temperature is required, at least if the major part of the material moisture content consists of adsorbed moisture, which is the case with sand.
  • it is sufficient to heat the air 0-15 C (depending on its initial temperature and initial moisture content) .
  • the drying chamber wall 11 or 11' (Fig. 4 or 5) is formed in the illustrated, preferred embodiments by an extruded aluminium section which, at its junction with the gap 4 or 4', has an outward baffle strip 12 or 12 ' extending parallel to the gap 4, the baffle being configured and directed such that together with an opposing wall 13 or 13' of the plenum chamber 3 material supply means 2 or the same section 11 or 11 ' ensures a tangential flow of air through the gap 4 (in the direction of the arrow P in Figures 4 and 5) along the entire length of the drying chamber.
  • the gap width may optionally be greater in the region for the material supply means 2 than along the remaining portion of the drying chamber.
  • the opening 15 or 15' associated with the material supply means 2 is situated at the drying chamber wall 11 or 11 ' and is elongate (rectangular) and parallel to the longi ⁇ tudinal direction of the drying chamber 1 , as illustrated in Figure 3. It will be further seen from Figures 4 and 5 that the opening 15 or 15' is separately situated in the immediate vicinity of the air intake gap 4 or 4 ' , namely in circumferential relationship thereto. In the embodiment according to Figure 4, the opening 15 is situated upwardly in the chamber wall 11 , the inlet gap 4 being situated immediately to one side of the opening 15 and directed substantially tangentially towards it.
  • the material to be dried will be heavily deflected laterally as it falls from the means 2, and will be entrained by the air flow and given a helical movement path in the vicinity of the chamber wall 11 while being simultaneously dried and conveyed towards the separator 5.
  • the air intake aperture 14 at the end wall prevents any material from collecting against this end of the drying chamber. Since the gap 4 is continuous along the entire length of the drying chamber 1 there is also ensured a smooth, essen ⁇ tially uniform and turbulence-free flow (so-called poten- tial flow) in the entire chamber, although the axial flow rate increases in a direction towards the outlet.
  • the heavy grains of sand are retained substantially in the circum ⁇ ferential region, i.e.
  • the opening 15' is situated at a side portion of the drying chamber wall 11 r , the air intake gap 4' being situated immediately under it and directed tangentially downwards, so that the rotat- "ing air -flow coacts with the movement of the falling mate ⁇ rial.
  • dry air and entrained grains of sand flow close to the circumference (the chamber wall 11 ' ), while moist air is sucked in towards the centre.
  • the material supply means 2 itself is illustrated in Figs . 6a, 6b and 6c, and it comprises an elongate hopper with vertical end walls 2a, 2b (Fig. 6a) and downwardly convers ⁇ ing, inclined side walls 2c, 2d (Fig. 6b) . At the bottom of these walls there is a horizontally arranged shaking grating 2e mounted for reciprocation.
  • This can suitably be formed in a corresponding way " as for a grater, and for continuous reciprocatory motion gives a smooth, uniform feed of the material to the opening 15 or 15' (Figs 4 or 5), where special junction plates ensure a tight joint between the material supply means 2 and the drying chamber 1
  • Figs. 6a, 6b and 6c At the bottom of these walls there is a horizontally arranged shaking grating 2e mounted for reciprocation.
  • This can suitably be formed in a corresponding way " as for a grater, and for continuous reciprocatory motion gives a smooth, uniform feed of the material to the opening 15 or 15
  • the mate ⁇ rial supply means 2 is a conveyor belt 16, the upper part 16a of which runs substantially horisontally and in coaction with the lower part of the drying chamber 1 ' ' at the feed end, where an elongate material supply opening 15' ' coin ⁇ cides with the air intake gap 4' ' .
  • the part 16a of the conveyor belt 16 thus forms a lower definition of the plenum chamber 3' ' at the feed end, a support roll 17 ensuring the desired distance between the forward front edge 19 of the chamber and the conveyor belt, while a roll 18 ensures that there is coaction between the bottom portion 20 of the drying wall 11 ' and the belt.
  • FIG 9 there is illustrated a unit with a plurality of drying chambers 21a-21e placed side by side, with associated material supply means 22a-22e, the chambers having a common plenum chamber 23 for intake air and a similarly common separator means, although the latter is not illustrated.
  • the drying apparatus in accordance with the invention can be used for chemical or pharmaceutical granulates, which are sensitive to over-heating, e.g. aallrreeaaddyy aatt 5500 CC,, oorr ffoorr aannyy ggrraannuullaarr oor pulverulant mate- rial which is to be effectively dried.
  • over-heating e.g. aallrreeaaddyy aatt 5500 CC, oorr ffoorr aannyy ggrraannuullaarr oor pulverulant mate- rial which is to be effectively dried.
  • the drying chamber 1 does not need to be cylindrical but can be weakly conical (suitably tapering towards the outlet).
  • the material supply means 2 can be implemented as required for ensuring uniform feed. What is essential is that its connection opening (the shape of which can also be varied) partially coincides with, or is situated in the circumfe ⁇ rential region adjacent a drying gas inlet gap. More than one such gap can be arranged optionally, although one gap must extend substantially along the entire length of the drying chamber, so that uniform flow is obtained.
  • the drying chamber can be inclined, or even oriented vertically (with the material supply means arranged upwardly) , in which case the extra air intake opening 1 can be optionally excluded. If a drying gas other than air is used this gas can be dewatered and recirculated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

Un appareil, qui sert à sécher un matériau granulaire ou pulvérulent, tel que notamment du sable humide, comprend une chambre de séchage cylindrique (16) pourvue d'une ouverture (15) d'acheminement du matériau située à l'une de ses parties terminales et d'un séparateur de matériau (5) placé à l'autre partie terminale, une ouverture d'entrée (4) ménagée dans la chambre de séchage, de façon à laisser entrer le courant tangentiel d'un gaz de séchage tel que de l'air et une ouverture de sortie (5a) placée de façon à coopérer avec le séparateur de matériau (5) pour l'évacuation du gaz de séchage. Un écoulement traversant hélicoïdal du gaz de séchage est obtenu dans la chambre de séchage, de sorte que le matériau est entraîné et séché par le gaz de séchage durant ledit écoulement traversant. Selon la présente invention, l'ouverture d'entrée du gaz de séchage comprend un espace libre (4) au niveau de la paroi (11) de la chambre de séchage, ledit espace s'étendant dans le sens axial au moins sur la majeure partie de la longueur de la chambre de séchage (1), et l'ouverture (15) d'acheminement du matériau est située de la même façon au niveau de la paroi (11) de la chambre de séchage, c'est-à-dire qu'elle coïncide avec l'espace libre (4) pour l'entrée du gaz de séchage ou qu'elle se trouve dans la région périphérique adjacente audit espace libre (4).
PCT/SE1987/000550 1986-11-21 1987-11-20 Dispositif de sechage pour materiau granulaire WO1988004020A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8604985-5 1986-11-21
SE8604985A SE8604985D0 (sv) 1986-11-21 1986-11-21 Torkanordning for korn- eller pulverformigt material

Publications (1)

Publication Number Publication Date
WO1988004020A1 true WO1988004020A1 (fr) 1988-06-02

Family

ID=20366364

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1987/000550 WO1988004020A1 (fr) 1986-11-21 1987-11-20 Dispositif de sechage pour materiau granulaire

Country Status (2)

Country Link
SE (1) SE8604985D0 (fr)
WO (1) WO1988004020A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998040681A1 (fr) * 1997-03-10 1998-09-17 Opdenkamp Adviesgroep B.V. Secheur a cyclone pour boue
WO2007057896A1 (fr) * 2005-11-17 2007-05-24 Particle Treatment Technologies Ltd Dispositif et procede de deshydratation
ES2334619A1 (es) * 2008-03-13 2010-03-12 Grande Grupo Andaluz De Estudios, S.L. Sistema de inyeccion de gases en el interior de un tromel de secado.
GB2531009A (en) * 2014-10-07 2016-04-13 Vectura Ltd Spray Drier Apparatus
EP3221651A4 (fr) * 2014-11-19 2018-08-08 Deep Exploration Technologies CRC Limited Appareil de séchage et procédé associé

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2456674A (en) * 1945-12-12 1948-12-21 Robert A Caughey Apparatus for drying finely divided materials while suspended in a gas
SE368864B (fr) * 1965-09-13 1974-07-22 Motch Merryweather Machinery
US3838523A (en) * 1973-03-08 1974-10-01 Motch Merryweather Machinery Multi-stage drying apparatus and method
SE387432B (sv) * 1970-11-16 1976-09-06 Buss Ag Sett och apparat for kontinuerlig behandling av partiklar i en gasstrom

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2456674A (en) * 1945-12-12 1948-12-21 Robert A Caughey Apparatus for drying finely divided materials while suspended in a gas
SE368864B (fr) * 1965-09-13 1974-07-22 Motch Merryweather Machinery
SE387432B (sv) * 1970-11-16 1976-09-06 Buss Ag Sett och apparat for kontinuerlig behandling av partiklar i en gasstrom
US3838523A (en) * 1973-03-08 1974-10-01 Motch Merryweather Machinery Multi-stage drying apparatus and method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998040681A1 (fr) * 1997-03-10 1998-09-17 Opdenkamp Adviesgroep B.V. Secheur a cyclone pour boue
WO2007057896A1 (fr) * 2005-11-17 2007-05-24 Particle Treatment Technologies Ltd Dispositif et procede de deshydratation
ES2334619A1 (es) * 2008-03-13 2010-03-12 Grande Grupo Andaluz De Estudios, S.L. Sistema de inyeccion de gases en el interior de un tromel de secado.
GB2531009A (en) * 2014-10-07 2016-04-13 Vectura Ltd Spray Drier Apparatus
EP3221651A4 (fr) * 2014-11-19 2018-08-08 Deep Exploration Technologies CRC Limited Appareil de séchage et procédé associé
US10393436B2 (en) 2014-11-19 2019-08-27 Minex Crc Ltd Drying apparatus and related method
EP3819575A3 (fr) * 2014-11-19 2021-09-08 MinEx CRC Ltd Appareil de séchage

Also Published As

Publication number Publication date
SE8604985D0 (sv) 1986-11-21

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