EP3080534A1 - Method and arrangement for drying particulate material and use of the method or of the arrangement - Google Patents

Method and arrangement for drying particulate material and use of the method or of the arrangement

Info

Publication number
EP3080534A1
EP3080534A1 EP13814485.2A EP13814485A EP3080534A1 EP 3080534 A1 EP3080534 A1 EP 3080534A1 EP 13814485 A EP13814485 A EP 13814485A EP 3080534 A1 EP3080534 A1 EP 3080534A1
Authority
EP
European Patent Office
Prior art keywords
venturi dryer
drying section
venturi
feeding
dryer
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.)
Granted
Application number
EP13814485.2A
Other languages
German (de)
French (fr)
Other versions
EP3080534B1 (en
Inventor
Michael STRÖDER
Wolfgang Selt
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.)
Outotec Finland Oy
Original Assignee
Outotec Finland Oy
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 Outotec Finland Oy filed Critical Outotec Finland Oy
Publication of EP3080534A1 publication Critical patent/EP3080534A1/en
Application granted granted Critical
Publication of EP3080534B1 publication Critical patent/EP3080534B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/10—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour carrying the materials or objects to be dried with it
    • 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
    • F26B17/101—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 the drying enclosure having the shape of one or a plurality of shafts or ducts, e.g. with substantially straight and vertical axis
    • F26B17/103—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 the drying enclosure having the shape of one or a plurality of shafts or ducts, e.g. with substantially straight and vertical axis with specific material feeding arrangements, e.g. combined with disintegrating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/001—Handling, e.g. loading or unloading arrangements

Definitions

  • the invention relates to a method for drying particulate material such as hydrocarbonous particulate material, for example oil shale, as defined in the preamble of independent claim 1.
  • the invention also relates to an arrangement for drying particulate material such as hydrocarbonous particulate material, for example oil shale, as defined in the preamble of independent claim 13.
  • particulate material such as hydrocarbonous particulate material, for example oil shale
  • the invention relates also to the use of the method or to the use of the arrangement as defined in claim 25.
  • the invention relates especially to drying of hydrocarbonous particulate material in the form of shale oil.
  • the method and arrangement of the invention can however also be utilized for drying other kind of particulate matter.
  • particulate material falls from the drying section of the venturi dryer through the venturi throat into the gas feeding section of the venturi dryer, where the temperature is relative high, for example 400 to 500°C.
  • This high temperature causes the temperature of the particulate material present in the gas feeding section of the venturi dryer to raise i.e. to causing the hydrocarbonous particulate material to overheat and consequently to cause hydrocarbon and/or CO emissions.
  • the object of the invention is to provide a method and an arrangement for drying particulate material such as hydrocarbonous particulate material, for example oil shale, that lowers the risk to cause undesired emissions.
  • particulate material such as hydrocarbonous particulate material, for example oil shale
  • the method for drying particulate material such as hydrocarbonous particulate material, for example oil shale, of the invention is characterized by the definitions of independent claim 1.
  • the invention relates also to the use of the method as defined in any of the claims 1 to 12 or the arrangement as defined in any of the claims 13 to 24 for drying particulate material in the form of shale oil as defined in claim 25.
  • the invention is based on the idea of feeding particulate material at several points into the drying section of the venturi dryer. This leads to a more even distribution of particulate material in the drying section of the venturi dryer, which in turn lowers the risk that particulate material falls from the drying section of the venturi dryer through the venturi throat into the gas feeding section of the venturi dryer.
  • the screw feeders are connected to the drying section of the venturi dryer at feeding openings so that the central axis of the venturi dryer is uncut by imaginary extension of the rotation axis of the screw feeders.
  • the screw feeders are connected to the drying section of the venturi dryer at feeding openings so that the feeding openings at which the screw feeders opens into the drying section of the venturi dryer are provided symmetrically with respect to the central axis of the venturi dryer. This leads to an even distribution of particulate material in the drying section of the venturi dryer, because the feeding openings are situated as far as possible from each other.
  • Figure 1 is a principle sketch of an embodiment of the arrangement
  • Figure 2 shows a configuration of section A- A in figure 1
  • Figure 3 shows another configuration of section A-A in figure 1
  • Figure 4 shows yet another configuration of section A-A in figure 1
  • Figure 5 shows still another configuration of section A-A in figure 1.
  • the figures show examples of methods and apparatuses for drying particulate material such as hydrocarbonous particulate material, for example oil shale.
  • particulate material such as hydrocarbonous particulate material, for example oil shale
  • hydrocarbonous particulate material for example oil shale
  • the method comprises a providing step for providing a venturi dryer 1 having a venturi throat 2 and a drying section 3 in fluid connection with the venturi throat 2, and for providing a material feeding means 4 for feeding particulate material 10 from a particulate material source 5 into the drying section 3 of the venturi dryer 1, wherein the venturi dryer 1 having an inner space
  • the method comprises a material feeding step for feeding particulate material 10 from the particulate material source 5 into the drying section 3 of the venturi dryer by means of the material feeding means 4.
  • the method comprises a gas feeding step for feeding gas 11 from a gas feeding section 9 of the venturi dryer 1 through the venturi throat 2 of the venturi dryer 1 into the drying section 3 of the venturi dryer 1 and through particulate material 10 in the drying section 3 of the venturi dryer 1.
  • the gas 11 can for example be hot gas containing oxygen.
  • the gas 11 can for example be flue gas originating from a combustion process (not shown in the figures).
  • the gas feeding step may include feeding gas 11 from a gas source (not shown in the drawings) into the gas feeding section 9 of the venturi dryer 1.
  • the gas 11 that is fed in the gas feeding step may have a temperature between 400 and 500°C, for example about 450°C.
  • the particulate material 10 that is fed in the material feeding step from the particulate material source 5 may have a temperature of about 20°C or the temperature of the ambient air surrounding the particulate material source 5.
  • the temperature in the drying section 3 of the venturi dryer 1 may be between 100 °C and 200°C, for example 150°C.
  • the providing step includes providing a material feeding means 4 comprising at least two screw feeders 6 each comprising a spiral blade 7 rotatable about a rotation axis C so as to feed particulate material 10 by rotating the spiral blade 7 about the rotation axis C from a particulate material source 5 to the drying section 3 of the venturi dryer 1.
  • a material feeding means 4 comprising at least two screw feeders 6 each comprising a spiral blade 7 rotatable about a rotation axis C so as to feed particulate material 10 by rotating the spiral blade 7 about the rotation axis C from a particulate material source 5 to the drying section 3 of the venturi dryer 1.
  • the method comprises connecting each of said at least two screw feeders 6 to the drying section 3 of the venturi dryer 1 so that each of said at least two screw feeders 6 opening up into the drying section 3 of the venturi dryer 1 at a feeding opening 8 between the screw feeder 6 and the drying section 3 of the venturi dryer 1.
  • the material feeding step includes rotating the spiral blade 7 of each of said at least two screw feeders 6 about the rotation axis C of respective screw feeder 6 to feed feeding particulate material 10 from a particulate material source 5 into the drying section 3 of the venturi dryer 1.
  • the separation means can for example comprise gas-solid separation means such as a cyclone, an electrostatic precipitator, a bag filter or a candle filter.
  • the method includes preferably, but not necessarily, connecting at least one of said at least two screw feeders 6 to the drying section 3 of the venturi dryer so that the central axis B of the inner space of the venturi dryer lis uncut by an imaginary extension 12 of the rotation axis C of said at least one screw feeder 6 of said at least two screw feeders 6.
  • the method includes preferably, but not necessarily, connecting each of said at least two screw feeders 6 to the drying section 3 of the venturi dryer so that the central axis B of the inner space of the venturi dryer lis uncut by an imaginary extension 12 of the rotation axis C of each screw feeder 6.
  • the method includes preferably, but not necessarily, connecting each of said at least two screw feeders 6 to the drying section 3 of the venturi dryer 1 so that the feeding openings 8 at which said at least two screw feeders 6 opens into the drying section 3 of the venturi dryer 1 are provided symmetrically with respect to the central axis B of the inner space of the venturi dryer 1.
  • the providing step may, as shown in the embodiment shown in figure 2, include providing a material feeding means 4 comprising two screw feeders 6 each comprising a spiral blade 7 rotatable about a rotation axis C.
  • This embodiment of the method comprises connecting the two screw feeders 6 to the drying section 3 of the venturi dryer 1 so that the feeding openings 8 between each screw feeder 6 and the drying section 3 of the venturi dryer 1 are positioned under 120 degrees, preferably under 90 degrees, with respect to each other about the central axis B of the inner space of the venturi dryer 1.
  • the providing step may, as shown in the embodiment shown in figure 3, include providing a material feeding means 4 comprising two screw feeders 6 each comprising a spiral blade 7 rotatable about a rotation axis C.
  • This embodiment of the method comprises connecting the two screw feeders 6 to the drying section 3 of the venturi dryer 1 so that the feeding openings 8 between each screw feeder 6 and the drying section 3 of the venturi dryer 1 are positioned substantially 180 degrees with respect to each other about the central axis B of the inner space of the venturi dryer 1.
  • the providing step may, as shown in the embodiment shown in figure 4, include providing a material feeding means 4 comprising three screw feeders 6 each comprising a spiral blade 7 rotatable about a rotation axis C.
  • This embodiment of the method comprises connecting the three screw feeders 6 to the drying section 3 of the venturi dryer 1 so that the feeding openings 8 between each screw feeder 6 and the drying section 3 of the venturi dryer 1 are positioned substantially 120 degrees with respect to each other about the central axis B of the inner space of the venturi dryer 1.
  • the providing step may, as shown in the embodiment shown in figure 5, include providing a material feeding means 4 comprising four screw feeders 6 each comprising a spiral blade 7 rotatable about an rotation axis C.
  • This embodiment of the method comprises connecting the four screw feeders 6 to the drying section 3 of the venturi dryer 1 so that the feeding openings 8 between each screw feeder 6 and the drying section 3 of the venturi dryer 1 are positioned substantially 90 degrees with respect to each other about the central axis B of the inner space of the venturi dryer 1.
  • the method includes preferably, but not necessarily, connecting each of said at least two screw feeders 6 to the drying section 3 of the venturi dryer 1 so that each of the feeding openings 8 between each screw feeder 6 and the drying section 3 of the venturi dryer are positioned substantially at the same position along the central axis B of the inner space of the venturi dryer 1.
  • the method includes preferably, but not necessarily, connecting each of said at least two screw feeders 6 to the drying section 3 of the venturi dryer 1 so that each of the feeding openings 8 between each screw feeder 6 and the drying section 3 of the venturi dryer 1 are positioned substantially at the same vertical level i.e. height of the drying section 3 of the venturi dryer 1.
  • the providing step includes providing at least one screw feeder 6 having a right-handed spiral blade 7 and rotating said right-handed spiral blade 7 of at least one screw feeder 6 anti-clockwise in the material feeding step
  • the providing step includes providing at least one screw feeder 6 having a left-handed spiral blade 7 and by rotating said left-handed spiral blade 7 of at least one screw feeder 6 clockwise in the material feeding step.
  • This embodiment of the method includes preferably, but not necessarily, connecting said at least one screw feeder 6 having a right-handed spiral blade 7 to the drying section 3 of the venturi dryer 1 and connecting said at least one screw feeder 6 having a left-handed spiral blade 7 to the drying section 3 of the venturi dryer 1 so that both said at least one screw feeder 6 having a right-handed spiral blade 7 and said at least one screw feeder 6 having a left-handed spiral blade 7 feed particulate material 10 into the drying section 3 of the venturi dryer 1 at the side of the feeding opening 8 between respective screw feeder 6 and the drying section 3 of the venturi dryer 1 that is at a greater distance from the central axis B of the inner space of the venturi dryer 1 than the other side of the feeding opening 8 between respective screw feeder 6 and the drying section 3 of the venturi dryer 1.
  • particulate material 10 is therefore fed into the drying section 3 of the venturi dryer 1 at locations being as far as possible from each other.
  • the number of the screw feeders is three, as in fig 4, or four, as in fig 5, all the screw feeders 6 could either have a left-handed spiral blade 7 or a right-handed spiral blade 7.
  • the screw feeders 6 could be arranged in pairs so that material feeding means 4 for feeding particulate material 10 from a particulate material source 5 into the drying section 3 of the venturi dryer 1 have two screw feeders having a left-handed spiral blade 7 and two screw feeders having a right-handed spiral blade 7.
  • the control of an electric motor (not shown in the drawings) for rotation of a left-handed spiral blade 7 of a screw feeder 6 or of an electric motor (not shown in the drawings) for rotation of a right-handed spiral blade 7 of a screw feeder 6 can for example be done by means of an electronic steering means (not shown in the drawings) comprising an encoder (not shown in the drawings).
  • a such electronic steering means may provide for phase shifting steering the rotation direction and rotation speed.
  • the method includes preferably, but not necessarily, connecting each of said at least two screw feeders 6 to the drying section 3 of the venturi dryer 1 so that the rotation axis C of said at least two screw feeders 6 extends in a mirror-like manner in relation to each other with respect to a plane (not shown in the drawings) extending in the direction of the central axis B of the inner space of the venturi dryer 1.
  • a plane not shown in the drawings
  • particulate material such as hydrocarbonous particulate material for example oil shale an some embodiments and variants thereof will be described in greater detail.
  • the arrangement comprises a venturi dryer 1 having a venturi throat 2 and a drying section 3 in fluid connection with the venturi throat 2, and wherein the venturi dryer 1 having an inner space that is symmetrical with respect to a central axis B.
  • the arrangement comprises material feeding means 4 for feeding particulate material 10 from a particulate material source 5 into the drying section 3 of the venturi dryer 1.
  • the venturi dryer 1 comprises gas feeding section 9 for feeding gas 11 through the venturi throat 2 of the venturi dryer 1 into the drying section 3 of the venturi dryer 1.
  • the arrangement may include a gas source (not shown in the drawings) in fluid connection with the gas feeding section 9 of the venturi dryer 1.
  • the material feeding means 4 for feeding particulate material 10 from a particulate material source 5 into the drying section 3 of the venturi dryer 1 comprises at least two screw feeders 6 comprising a spiral blade 7 rotatable about an rotation axis C so as to feed particulate material 10 from a particulate material source 5 to the drying section 3 of the venturi dryer 1.
  • Each of said at least two screw feeders 6 opening up into the drying section 3 of the venturi dryer 1 at a feeding opening 8 between the screw feeder 6 and the drying section 3 of the venturi dryer 1.
  • At least one of said at least two screw feeders 6 is preferably, but not necessarily, connected to the drying section 3 of the venturi dryer 1 so that the central axis B of the inner space of the venturi dryer lis uncut by an imaginary extension 12 of the rotation axis of said at least one screw feeder 6 of said at least two screw feeders 6.
  • Each screw feeder 6 of said arrangement is preferably, but not necessarily, connected to the drying section 3 of the venturi dryer 1 so that the central axis B of the venturi dryer is uncut by an imaginary extension 12 of the rotation axis C of a screw feeder 6.
  • the feeding openings 8 at which each of said at least two screw feeders 6 opens into the drying section 3 of the venturi dryer 1 is preferably, but not necessarily, provided symmetrically with respect to the central axis B of the inner space of the venturi dryer 1.
  • the material feeding means 4 of the arrangement may, as shown in figure 3, comprise two screw feeders 6 each comprising a spiral blade 7 rotatable about an rotation axis C, and the two screw feeders 6 may be connected to the drying section 3 of the venturi dryer 1 so that the feeding openings 8 between each screw feeder 6 and the drying section 3 of the venturi dryer 1 are positioned under 120 degrees, preferably under 90 degrees, with respect to each other about the central axis B of the venturi dryer.
  • the material feeding means 4 of the arrangement may, as shown in figure 3, comprise two screw feeders 6 each comprising a spiral blade 7 rotatable about an rotation axis C, and the two screw feeders 6 may be connected to the drying section 3 of the venturi dryer 1 so that the feeding openings 8 between each screw feeder 6 and the drying section 3 of the venturi dryer 1 are positioned substantially 180 degrees with respect to each other about the central axis B of the venturi dryer.
  • the material feeding means 4 of the arrangement may, as shown in figure 4, comprise three screw feeders 6 comprising a spiral blade 7 rotatable about an rotation axis C, and the three screw feeders 6 may be connected to the drying section 3 of the venturi dryer 1 so that the feeding openings 8 between each screw feeder 6 and the drying section 3 of the venturi dryer 1 are positioned substantially 120 degrees with respect to each other about the central axis B of the inner space of the venturi dryer 1.
  • the material feeding means 4 of the arrangement may, as shown in figure 5, comprise four screw feeders 6 comprising a spiral blade 7 rotatable about an rotation axis C, and the four screw feeders 6 may be connected to the drying section 3 of the venturi dryer 1 so that the feeding openings 8 between each screw feeder 6 and the drying section 3 of the venturi dryer 1 are positioned substantially 90 degrees with respect to each other about the central axis B of the venturi dryer.
  • Each screw feeder 6 of the arrangement is preferably, but not necessarily, connected to the drying section 3 of the venturi dryer 1 so that each of the feeding openings 8 are positioned substantially at the same position along the central axis B of the inner space of the venturi dryer 1.
  • Each screw feeder 6 of the arrangement are preferably, but not necessarily, connected to the drying section 3 of the venturi dryer 1 so that each of the feeding openings 8 are positioned substantially at the same vertical level i.e. height of the drying section 3 of the venturi dryer 1.
  • the material feeding means 4 for feeding particulate material 10 from a particulate material source 5 into the drying section 3 of the venturi dryer 1 comprises in an embodiment of the arrangement at least one screw feeder 6 having a right-handed spiral blade 7, and at least one screw feeder 6 having a left-handed spiral blade 7 .
  • said at least one screw feeder 6 having a right-handed spiral blade 7 is preferably, but not necessarily, connected to the drying section 3 of the venturi dryer 1 and said at least one screw feeder 6 having a left-handed spiral blade 7 is preferably, but not necessarily, connected to the drying section 3 of the venturi dryer 1 so that both said at least one screw feeder 6 having a right-handed spiral blade 7 and said at least one screw feeder 6 having a left-handed spiral blade 7 is configured to feed particulate material 10 into the drying section 3 of the venturi dryer 1 at the side of the feeding opening 8 between respective screw feeder 6 and the drying section 3 of the venturi dryer 1 that is at a greater distance from the central axis B of the inner space of the venturi dryer lthan the other side of the feeding opening 8 between respective screw feeder 6 and the drying section 3 of the venturi dryer 1.
  • the screw feeders 6 could be arranged in pairs so that material feeding means 4 for feeding particulate material 10 from a particulate material source 5 into the drying section 3 of the venturi dryer 1 have two screw feeders having a left-handed spiral blade 7 and two screw feeders having a right-handed spiral blade 7.
  • the control of an electric motor (not shown in the drawings) for rotation of a left-handed spiral blade 7 of a screw feeder 6 or of an electric motor (not shown in the drawings) for rotation of a right-handed spiral blade 7 of a screw feeder 6 can for example be done by means of an electronic steering means (not shown in the drawings) comprising an encoder (not shown in the drawings).
  • a such electronic steering means may provide for phase shifting steering the rotation direction and rotation speed.
  • the rotation axis of said at least two screw feeders 6 may, as shown in figure 2, extend in a mirror-like manner in relation to each other with respect to a plane extending in the direction of the central axis B of the venturi dryer.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The invention relates to a method and to an arrangement for drying particulate material (10). The arrangement comprising a venturi dryer (1) having a venturi throat (2) and a drying section (3) in fluid connection with the venturi throat (2). The venturi dryer (1) has an inner space that is symmetrical with respect to a central axis (B), and material feeding means (4) for feeding particulate material (10) into the drying section (3). The venturi dryer (1) has a gas feeding section (9) for feeding gas (11) through the venturi throat (2) into the drying section (3). The material feeding means (4) comprising at least two screw feeders (6) comprising a spiral blade (7). Each of said at least two screw feeders (6) opening up into the drying section (3) at a feeding opening (8) between the screw feeder (6) and the drying section (3).

Description

METHOD AND ARRANGEMENT FOR DRYING PARTICULATE MATERIAL AND USE OF THE METHOD OR OF THE ARRANGEMENT
Field of the invention
The invention relates to a method for drying particulate material such as hydrocarbonous particulate material, for example oil shale, as defined in the preamble of independent claim 1.
The invention also relates to an arrangement for drying particulate material such as hydrocarbonous particulate material, for example oil shale, as defined in the preamble of independent claim 13.
The invention relates also to the use of the method or to the use of the arrangement as defined in claim 25.
The invention relates especially to drying of hydrocarbonous particulate material in the form of shale oil. The method and arrangement of the invention can however also be utilized for drying other kind of particulate matter.
Especially when drying particulate material in the form of hydrocarbonous particulate material by means of a venturi dryer a risk is present that particulate material falls from the drying section of the venturi dryer through the venturi throat into the gas feeding section of the venturi dryer, where the temperature is relative high, for example 400 to 500°C. This high temperature causes the temperature of the particulate material present in the gas feeding section of the venturi dryer to raise i.e. to causing the hydrocarbonous particulate material to overheat and consequently to cause hydrocarbon and/or CO emissions.
Objective of the invention
The object of the invention is to provide a method and an arrangement for drying particulate material such as hydrocarbonous particulate material, for example oil shale, that lowers the risk to cause undesired emissions.
Short description of the invention
The method for drying particulate material such as hydrocarbonous particulate material, for example oil shale, of the invention is characterized by the definitions of independent claim 1.
Preferred embodiments of the method are defined in the dependent claims 2 to 12.
The arrangement for drying particulate material such as hydrocarbonous particulate material, for example oil shale, of the invention is correspondingly characterized by the definitions of independent claim 13.
Preferred embodiments of the arrangement are defined in the dependent claims 14 to 24.
The invention relates also to the use of the method as defined in any of the claims 1 to 12 or the arrangement as defined in any of the claims 13 to 24 for drying particulate material in the form of shale oil as defined in claim 25. The invention is based on the idea of feeding particulate material at several points into the drying section of the venturi dryer. This leads to a more even distribution of particulate material in the drying section of the venturi dryer, which in turn lowers the risk that particulate material falls from the drying section of the venturi dryer through the venturi throat into the gas feeding section of the venturi dryer.
In a preferred embodiment of the invention the screw feeders are connected to the drying section of the venturi dryer at feeding openings so that the central axis of the venturi dryer is uncut by imaginary extension of the rotation axis of the screw feeders. The advantage of this is that particulate material is not directed towards the middle of the inner space of the drying section of the venturi dryer where it can fall into the venturi throat.
In a preferred embodiment of the invention the screw feeders are connected to the drying section of the venturi dryer at feeding openings so that the feeding openings at which the screw feeders opens into the drying section of the venturi dryer are provided symmetrically with respect to the central axis of the venturi dryer. This leads to an even distribution of particulate material in the drying section of the venturi dryer, because the feeding openings are situated as far as possible from each other.
List of figures
In the following the invention will described in more detail by referring to the figures, of which
Figure 1 is a principle sketch of an embodiment of the arrangement,
Figure 2 shows a configuration of section A- A in figure 1,
Figure 3 shows another configuration of section A-A in figure 1,
Figure 4 shows yet another configuration of section A-A in figure 1, and
Figure 5 shows still another configuration of section A-A in figure 1.
Detailed description of the invention
The figures show examples of methods and apparatuses for drying particulate material such as hydrocarbonous particulate material, for example oil shale.
First the method for drying particulate material such as hydrocarbonous particulate material, for example oil shale, and some preferred embodiments and variants of the method will be described in greater detail.
The method comprises a providing step for providing a venturi dryer 1 having a venturi throat 2 and a drying section 3 in fluid connection with the venturi throat 2, and for providing a material feeding means 4 for feeding particulate material 10 from a particulate material source 5 into the drying section 3 of the venturi dryer 1, wherein the venturi dryer 1 having an inner space
(not marked with a reference numeral) symmetrical with respect to a central axis B of the inner space of the venturi dryer 1. The method comprises a material feeding step for feeding particulate material 10 from the particulate material source 5 into the drying section 3 of the venturi dryer by means of the material feeding means 4.
The method comprises a gas feeding step for feeding gas 11 from a gas feeding section 9 of the venturi dryer 1 through the venturi throat 2 of the venturi dryer 1 into the drying section 3 of the venturi dryer 1 and through particulate material 10 in the drying section 3 of the venturi dryer 1. The gas 11 can for example be hot gas containing oxygen. The gas 11 can for example be flue gas originating from a combustion process (not shown in the figures).
The gas feeding step may include feeding gas 11 from a gas source (not shown in the drawings) into the gas feeding section 9 of the venturi dryer 1.
The gas 11 that is fed in the gas feeding step may have a temperature between 400 and 500°C, for example about 450°C.
The particulate material 10 that is fed in the material feeding step from the particulate material source 5 may have a temperature of about 20°C or the temperature of the ambient air surrounding the particulate material source 5.
The temperature in the drying section 3 of the venturi dryer 1 may be between 100 °C and 200°C, for example 150°C.
The providing step includes providing a material feeding means 4 comprising at least two screw feeders 6 each comprising a spiral blade 7 rotatable about a rotation axis C so as to feed particulate material 10 by rotating the spiral blade 7 about the rotation axis C from a particulate material source 5 to the drying section 3 of the venturi dryer 1.
The method comprises connecting each of said at least two screw feeders 6 to the drying section 3 of the venturi dryer 1 so that each of said at least two screw feeders 6 opening up into the drying section 3 of the venturi dryer 1 at a feeding opening 8 between the screw feeder 6 and the drying section 3 of the venturi dryer 1.
The material feeding step includes rotating the spiral blade 7 of each of said at least two screw feeders 6 about the rotation axis C of respective screw feeder 6 to feed feeding particulate material 10 from a particulate material source 5 into the drying section 3 of the venturi dryer 1.
From the drying section 3 of the venturi dryer dried particulate material and gas may be fed to separation means (not shown in the figures) for separating gas from dried particulate material. The separation means can for example comprise gas-solid separation means such as a cyclone, an electrostatic precipitator, a bag filter or a candle filter.
The method includes preferably, but not necessarily, connecting at least one of said at least two screw feeders 6 to the drying section 3 of the venturi dryer so that the central axis B of the inner space of the venturi dryer lis uncut by an imaginary extension 12 of the rotation axis C of said at least one screw feeder 6 of said at least two screw feeders 6.
The method includes preferably, but not necessarily, connecting each of said at least two screw feeders 6 to the drying section 3 of the venturi dryer so that the central axis B of the inner space of the venturi dryer lis uncut by an imaginary extension 12 of the rotation axis C of each screw feeder 6.
The method includes preferably, but not necessarily, connecting each of said at least two screw feeders 6 to the drying section 3 of the venturi dryer 1 so that the feeding openings 8 at which said at least two screw feeders 6 opens into the drying section 3 of the venturi dryer 1 are provided symmetrically with respect to the central axis B of the inner space of the venturi dryer 1.
The providing step may, as shown in the embodiment shown in figure 2, include providing a material feeding means 4 comprising two screw feeders 6 each comprising a spiral blade 7 rotatable about a rotation axis C. This embodiment of the method comprises connecting the two screw feeders 6 to the drying section 3 of the venturi dryer 1 so that the feeding openings 8 between each screw feeder 6 and the drying section 3 of the venturi dryer 1 are positioned under 120 degrees, preferably under 90 degrees, with respect to each other about the central axis B of the inner space of the venturi dryer 1.
The providing step may, as shown in the embodiment shown in figure 3, include providing a material feeding means 4 comprising two screw feeders 6 each comprising a spiral blade 7 rotatable about a rotation axis C. This embodiment of the method comprises connecting the two screw feeders 6 to the drying section 3 of the venturi dryer 1 so that the feeding openings 8 between each screw feeder 6 and the drying section 3 of the venturi dryer 1 are positioned substantially 180 degrees with respect to each other about the central axis B of the inner space of the venturi dryer 1.
The providing step may, as shown in the embodiment shown in figure 4, include providing a material feeding means 4 comprising three screw feeders 6 each comprising a spiral blade 7 rotatable about a rotation axis C. This embodiment of the method comprises connecting the three screw feeders 6 to the drying section 3 of the venturi dryer 1 so that the feeding openings 8 between each screw feeder 6 and the drying section 3 of the venturi dryer 1 are positioned substantially 120 degrees with respect to each other about the central axis B of the inner space of the venturi dryer 1.
The providing step may, as shown in the embodiment shown in figure 5, include providing a material feeding means 4 comprising four screw feeders 6 each comprising a spiral blade 7 rotatable about an rotation axis C. This embodiment of the method comprises connecting the four screw feeders 6 to the drying section 3 of the venturi dryer 1 so that the feeding openings 8 between each screw feeder 6 and the drying section 3 of the venturi dryer 1 are positioned substantially 90 degrees with respect to each other about the central axis B of the inner space of the venturi dryer 1.
The method includes preferably, but not necessarily, connecting each of said at least two screw feeders 6 to the drying section 3 of the venturi dryer 1 so that each of the feeding openings 8 between each screw feeder 6 and the drying section 3 of the venturi dryer are positioned substantially at the same position along the central axis B of the inner space of the venturi dryer 1.
The method includes preferably, but not necessarily, connecting each of said at least two screw feeders 6 to the drying section 3 of the venturi dryer 1 so that each of the feeding openings 8 between each screw feeder 6 and the drying section 3 of the venturi dryer 1 are positioned substantially at the same vertical level i.e. height of the drying section 3 of the venturi dryer 1.
In an embodiment of the method, the providing step includes providing at least one screw feeder 6 having a right-handed spiral blade 7 and rotating said right-handed spiral blade 7 of at least one screw feeder 6 anti-clockwise in the material feeding step In this embodiment of the method, the providing step includes providing at least one screw feeder 6 having a left-handed spiral blade 7 and by rotating said left-handed spiral blade 7 of at least one screw feeder 6 clockwise in the material feeding step. This embodiment of the method includes preferably, but not necessarily, connecting said at least one screw feeder 6 having a right-handed spiral blade 7 to the drying section 3 of the venturi dryer 1 and connecting said at least one screw feeder 6 having a left-handed spiral blade 7 to the drying section 3 of the venturi dryer 1 so that both said at least one screw feeder 6 having a right-handed spiral blade 7 and said at least one screw feeder 6 having a left-handed spiral blade 7 feed particulate material 10 into the drying section 3 of the venturi dryer 1 at the side of the feeding opening 8 between respective screw feeder 6 and the drying section 3 of the venturi dryer 1 that is at a greater distance from the central axis B of the inner space of the venturi dryer 1 than the other side of the feeding opening 8 between respective screw feeder 6 and the drying section 3 of the venturi dryer 1. In this embodiment particulate material 10 is therefore fed into the drying section 3 of the venturi dryer 1 at locations being as far as possible from each other. On the other hand, if the number of the screw feeders is three, as in fig 4, or four, as in fig 5, all the screw feeders 6 could either have a left-handed spiral blade 7 or a right-handed spiral blade 7. On the other hand, if the number of the screw feeders 6 is four, as in fig 5, the screw feeders 6 could be arranged in pairs so that material feeding means 4 for feeding particulate material 10 from a particulate material source 5 into the drying section 3 of the venturi dryer 1 have two screw feeders having a left-handed spiral blade 7 and two screw feeders having a right-handed spiral blade 7.
The control of an electric motor (not shown in the drawings) for rotation of a left-handed spiral blade 7 of a screw feeder 6 or of an electric motor (not shown in the drawings) for rotation of a right-handed spiral blade 7 of a screw feeder 6 can for example be done by means of an electronic steering means (not shown in the drawings) comprising an encoder (not shown in the drawings). A such electronic steering means may provide for phase shifting steering the rotation direction and rotation speed.
The method includes preferably, but not necessarily, connecting each of said at least two screw feeders 6 to the drying section 3 of the venturi dryer 1 so that the rotation axis C of said at least two screw feeders 6 extends in a mirror-like manner in relation to each other with respect to a plane (not shown in the drawings) extending in the direction of the central axis B of the inner space of the venturi dryer 1. A such embodiment is shown in figure 2 and in figure 4.
Next the arrangement for drying particulate material such as hydrocarbonous particulate material for example oil shale an some embodiments and variants thereof will be described in greater detail.
The arrangement comprises a venturi dryer 1 having a venturi throat 2 and a drying section 3 in fluid connection with the venturi throat 2, and wherein the venturi dryer 1 having an inner space that is symmetrical with respect to a central axis B.
The arrangement comprises material feeding means 4 for feeding particulate material 10 from a particulate material source 5 into the drying section 3 of the venturi dryer 1.
The venturi dryer 1 comprises gas feeding section 9 for feeding gas 11 through the venturi throat 2 of the venturi dryer 1 into the drying section 3 of the venturi dryer 1.
The arrangement may include a gas source (not shown in the drawings) in fluid connection with the gas feeding section 9 of the venturi dryer 1.
The material feeding means 4 for feeding particulate material 10 from a particulate material source 5 into the drying section 3 of the venturi dryer 1 comprises at least two screw feeders 6 comprising a spiral blade 7 rotatable about an rotation axis C so as to feed particulate material 10 from a particulate material source 5 to the drying section 3 of the venturi dryer 1.
Each of said at least two screw feeders 6 opening up into the drying section 3 of the venturi dryer 1 at a feeding opening 8 between the screw feeder 6 and the drying section 3 of the venturi dryer 1.
At least one of said at least two screw feeders 6 is preferably, but not necessarily, connected to the drying section 3 of the venturi dryer 1 so that the central axis B of the inner space of the venturi dryer lis uncut by an imaginary extension 12 of the rotation axis of said at least one screw feeder 6 of said at least two screw feeders 6.
Each screw feeder 6 of said arrangement is preferably, but not necessarily, connected to the drying section 3 of the venturi dryer 1 so that the central axis B of the venturi dryer is uncut by an imaginary extension 12 of the rotation axis C of a screw feeder 6.
The feeding openings 8 at which each of said at least two screw feeders 6 opens into the drying section 3 of the venturi dryer 1 is preferably, but not necessarily, provided symmetrically with respect to the central axis B of the inner space of the venturi dryer 1.
The material feeding means 4 of the arrangement may, as shown in figure 3, comprise two screw feeders 6 each comprising a spiral blade 7 rotatable about an rotation axis C, and the two screw feeders 6 may be connected to the drying section 3 of the venturi dryer 1 so that the feeding openings 8 between each screw feeder 6 and the drying section 3 of the venturi dryer 1 are positioned under 120 degrees, preferably under 90 degrees, with respect to each other about the central axis B of the venturi dryer.
The material feeding means 4 of the arrangement may, as shown in figure 3, comprise two screw feeders 6 each comprising a spiral blade 7 rotatable about an rotation axis C, and the two screw feeders 6 may be connected to the drying section 3 of the venturi dryer 1 so that the feeding openings 8 between each screw feeder 6 and the drying section 3 of the venturi dryer 1 are positioned substantially 180 degrees with respect to each other about the central axis B of the venturi dryer.
The material feeding means 4 of the arrangement may, as shown in figure 4, comprise three screw feeders 6 comprising a spiral blade 7 rotatable about an rotation axis C, and the three screw feeders 6 may be connected to the drying section 3 of the venturi dryer 1 so that the feeding openings 8 between each screw feeder 6 and the drying section 3 of the venturi dryer 1 are positioned substantially 120 degrees with respect to each other about the central axis B of the inner space of the venturi dryer 1.
The material feeding means 4 of the arrangement may, as shown in figure 5, comprise four screw feeders 6 comprising a spiral blade 7 rotatable about an rotation axis C, and the four screw feeders 6 may be connected to the drying section 3 of the venturi dryer 1 so that the feeding openings 8 between each screw feeder 6 and the drying section 3 of the venturi dryer 1 are positioned substantially 90 degrees with respect to each other about the central axis B of the venturi dryer.
Each screw feeder 6 of the arrangement is preferably, but not necessarily, connected to the drying section 3 of the venturi dryer 1 so that each of the feeding openings 8 are positioned substantially at the same position along the central axis B of the inner space of the venturi dryer 1.
Each screw feeder 6 of the arrangement are preferably, but not necessarily, connected to the drying section 3 of the venturi dryer 1 so that each of the feeding openings 8 are positioned substantially at the same vertical level i.e. height of the drying section 3 of the venturi dryer 1.
The material feeding means 4 for feeding particulate material 10 from a particulate material source 5 into the drying section 3 of the venturi dryer 1 comprises in an embodiment of the arrangement at least one screw feeder 6 having a right-handed spiral blade 7, and at least one screw feeder 6 having a left-handed spiral blade 7 . In this embodiment of the arrangement, said at least one screw feeder 6 having a right-handed spiral blade 7 is preferably, but not necessarily, connected to the drying section 3 of the venturi dryer 1 and said at least one screw feeder 6 having a left-handed spiral blade 7 is preferably, but not necessarily, connected to the drying section 3 of the venturi dryer 1 so that both said at least one screw feeder 6 having a right-handed spiral blade 7 and said at least one screw feeder 6 having a left-handed spiral blade 7 is configured to feed particulate material 10 into the drying section 3 of the venturi dryer 1 at the side of the feeding opening 8 between respective screw feeder 6 and the drying section 3 of the venturi dryer 1 that is at a greater distance from the central axis B of the inner space of the venturi dryer lthan the other side of the feeding opening 8 between respective screw feeder 6 and the drying section 3 of the venturi dryer 1. On the other hand, if the number of the screw feeders is three, as in fig 4, or four, as in fig 5, all the screw feeders 6 could either have a left-handed spiral blade 7 or a right-handed spiral blade 7. On the other hand, if the number of the screw feeders is four, as in fig 5, the screw feeders 6 could be arranged in pairs so that material feeding means 4 for feeding particulate material 10 from a particulate material source 5 into the drying section 3 of the venturi dryer 1 have two screw feeders having a left-handed spiral blade 7 and two screw feeders having a right-handed spiral blade 7.
The control of an electric motor (not shown in the drawings) for rotation of a left-handed spiral blade 7 of a screw feeder 6 or of an electric motor (not shown in the drawings) for rotation of a right-handed spiral blade 7 of a screw feeder 6 can for example be done by means of an electronic steering means (not shown in the drawings) comprising an encoder (not shown in the drawings). A such electronic steering means may provide for phase shifting steering the rotation direction and rotation speed.
In the arrangement the rotation axis of said at least two screw feeders 6 may, as shown in figure 2, extend in a mirror-like manner in relation to each other with respect to a plane extending in the direction of the central axis B of the venturi dryer.
It is apparent to a person skilled in the art that as technology advances, the basic idea of the invention can be implemented in various ways. The invention and its embodiments are therefore not restricted to the above examples, but they may vary within the scope of the claims.

Claims

Claims
1. A method for drying particulate material (10) such as hydrocarbonous particulate material, for example oil shale, comprising
a providing step for providing a venturi dryer (1) having a venturi throat (2) and a drying section (3) in fluid connection with the venturi throat (2), and for providing a material feeding means (4) for feeding particulate material (10) from a particulate material source (5) into the drying section (3) of the venturi dryer (1), wherein the venturi dryer (1) having an inner space symmetrical with respect to a central axis (B),
a material feeding step for feeding particulate material (10) from the particulate material source (5) into the drying section (3) of the venturi dryer by means of the material feeding means (4), and
a gas feeding step for feeding gas (11) from a gas feeding section (9) of the venturi dryer (1) through the venturi throat (2) of the venturi dryer (1) into the drying section (3) of the venturi dryer (1) and through particulate material (10) in the drying section (3) of the venturi dryer (1), characterized
by the providing step includes providing a material feeding means (4) comprising at least two screw feeders (6) comprising a spiral blade (7) rotatable about an rotation axis (C),
by connecting each of said at least two screw feeders (6) so that each of said at least two screw feeders (6) opening up into the drying section (3) of the venturi dryer (1) at a feeding opening (8) between the screw feeder (6) and the drying section (3) of the venturi dryer (1), and by the material feeding step includes rotating the spiral blade (7) of each of said at least two screw feeders (6) about an rotation axis (C) to feed feeding particulate material (10) from a particulate material source (5) into the drying section (3) of the venturi dryer (1).
2. The method according to claim 1, characterized by connecting at least one of said at least two screw feeders (6) to the drying section (3) of the venturi dryer (1) so that the central axis (B) of the inner space of the venturi dryer (1) is uncut by an imaginary extension (12) of the rotation axis (C) of said at least one screw feeder (6) of said at least two screw feeders (6).
3. The method according to claim 1, characterized by connecting each of said at least two screw feeders (6) being connected to the drying section (3) of the venturi dryer (1) so that the central axis (B) of the inner space of the venturi dryer (1) is uncut by an imaginary extension (12) of the rotation axis (C) of each screw feeder (6).
4. The method according to any of the claims 1 to 3, characterized by connecting each of said at least two screw feeders (6) to the drying section (3) of the venturi dryer (1) so that the feeding openings (8) at which said at least two screw feeders (6) opens into the drying section (3) of the venturi dryer (1) are provided symmetrically with respect to the central axis (B) of the inner space of the venturi dryer (1).
5. The method according to any of the claims 1 to 4, characterized
by the providing step includes providing a material feeding means (4) comprising two screw feeders (6) each comprising a spiral blade (7) rotatable about an rotation axis (C), and by connecting the two screw feeders (6) to the drying section (3) of the venturi dryer (1) so that the feeding openings (8) between each screw feeder (6) and the drying section (3) of the venturi dryer (1) are positioned under 120 degrees, preferably under 90 degrees, with respect to each other about the central axis (B) of the inner space of the venturi dryer (1).
6. The method according to any of the claims 1 to 4, characterized
by the providing step includes providing a material feeding means (4) comprising two screw feeders (6) each comprising a spiral blade (7) rotatable about an rotation axis (C), and by connecting the two screw feeders (6) to the drying section (3) of the venturi dryer (1) so that the feeding openings (8) between each screw feeder (6) and the drying section (3) of the venturi dryer (1) are positioned substantially 180 degrees with respect to each other about the central axis (B) of the inner space of the venturi dryer (1).
7. The method according to any of the claims 1 to 4, characterized
by the providing step includes providing a material feeding means (4) comprising three screw feeders (6) each comprising a spiral blade (7) rotatable about an rotation axis (C), and by connecting the three screw feeders (6) to the drying section (3) of the venturi dryer (1) so that the feeding openings (8) between each screw feeder (6) and the drying section (3) of the venturi dryer (1) are positioned substantially 120 degrees with respect to each other about the central axis (B) of the inner space of the venturi dryer (1).
8. The method according to any of the claims 1 to 4, characterized
by the providing step includes providing a material feeding means (4) comprising four screw feeders (6) each comprising a spiral blade (7) rotatable about an rotation axis (C), and by connecting the four screw feeders (6) to the drying section (3) of the venturi dryer (1) so that the feeding openings (8) between each screw feeder (6) and the drying section (3) of the venturi dryer (1) are positioned substantially 90 degrees with respect to each other about the central axis (B) of the inner space of the venturi dryer (1).
9. The method according to any of the claims 1 to 8, characterized
by connecting each of said at least two screw feeders (6) to the drying section (3) of the venturi dryer (1) so that each of the feeding openings (8) between each screw feeder (6) and the drying section (3) of the venturi dryer (1) are positioned substantially at the same position along the central axis (B) of the inner space of the venturi dryer (1).
10. The method according to any of the claims 1 to 9, characterized
by the providing step includes providing at least one screw feeder (6) having a right- handed spiral blade (7),
by rotating the spiral blade (7) of at least one screw feeder (6) having a right-handed spiral blade (7) anticlockwise in the material feeding step,
by the providing step includes providing at least one screw feeder (6) having a left- handed spiral blade (7) , and
by rotating the spiral blade (7) of at least one screw feeder (6) having a left-handed spiral blade (7) clockwise in the material feeding step.
11. The method according to claim 10, characterized
by connecting said at least one screw feeder (6) having a right-handed spiral blade (7) to the drying section (3) of the venturi dryer (1) and by connecting said at least one screw feeder (6) having a left-handed spiral blade (7) to the drying section (3) of the venturi dryer (1) so that both said at least one screw feeder (6) having a right-handed spiral blade (7) and said at least one screw feeder (6) having a left-handed spiral blade (7) feed particulate material (10) into the drying section (3) of the venturi dryer (1) at the side of the feeding opening (8) between respective screw feeder (6) and the drying section (3) of the venturi dryer (1) that is at a greater distance from the central axis (B) of the inner space of the venturi dryer (1) than the other side of the feeding opening (8) between respective screw feeder (6) and the drying section (3) of the venturi dryer (1).
12. The method according to any of the claims 1 to 11, characterized by connecting each of said at least two screw feeders (6) to the drying section (3) of the venturi dryer (1) so that the rotation axis of said at least two screw feeders (6) extends in a mirror-like manner in relation to each other with respect to a plane extending in the direction of the central axis (B) of the inner space of the venturi dryer (1).
13. An arrangement for drying particulate material (10) such as hydrocarbonous particulate material, for example oil shale, comprising
a venturi dryer (1) having a venturi throat (2) and a drying section (3) in fluid connection with the venturi throat (2), and wherein the venturi dryer (1) having an inner space that is symmetrical with respect to a central axis (B), and
material feeding means (4) for feeding particulate material (10) from a particulate material source (5) into the drying section (3) of the venturi dryer (1),
wherein the venturi dryer (1) having a gas feeding section (9) for feeding gas (11) through the venturi throat (2) of the venturi dryer (1) into the drying section (3) of the venturi dryer (1),
characterized
by the material feeding means (4) for feeding particulate material (10) from a particulate material source (5) into the drying section (3) of the venturi dryer (1) comprising at least two screw feeders (6) comprising a spiral blade (7) rotatable about an rotation axis (C), and
by each of said at least two screw feeders (6) opening up into the drying section (3) of the venturi dryer (1) at a feeding opening (8) between the screw feeder (6) and the drying section (3) of the venturi dryer (1).
14. The arrangement according to claim 13, characterized by at least one of said at least two screw feeders (6) being connected to the drying section (3) of the venturi dryer (1) so that the central axis (B) of the inner space of the venturi dryer (1) is uncut by an imaginary extension (12) of the rotation axis of said at least one screw feeder (6) of said at least two screw feeders (6).
15. The arrangement according to claim 13, characterized by each of said at least two screw feeders (6) being connected to the drying section (3) of the venturi dryer (1) so that the central axis (B) of the inner space of the venturi dryer (1) is uncut by an imaginary extension (12) of the rotation axis (C) of each screw feeder (6).
16. The arrangement according to any of the claims 13 to 15, characterized by the feeding openings (8) at which each of said at least two screw feeders (6) opens into the drying section (3) of the venturi dryer (1) being provided symmetrically with respect to the central axis (B) of the inner space of the venturi dryer (1).
17. The arrangement according to any of the claims 13 to 16, characterized
by the material feeding means (4) comprising two screw feeders (6) each comprising a spiral blade (7) rotatable about an rotation axis (C), and
by the two screw feeders (6) being connected to the drying section (3) of the venturi dryer
(1) so that the feeding openings (8) between each screw feeder (6) and the drying section (3) of the venturi dryer (1) are positioned under 120 degrees, preferably under 90 degrees, with respect to each other about the central axis (B) of the inner space of the venturi dryer (1).
18. The arrangement according to any of the claims 13 to 16, characterized
by the material feeding means (4) comprising two screw feeders (6) each comprising a spiral blade (7) rotatable about an rotation axis (C), and
by the two screw feeders (6) being connected to the drying section (3) of the venturi dryer (1) so that the feeding openings (8) between each screw feeder (6) and the drying section (3) of the venturi dryer (1) are positioned substantially 180 degrees with respect to each other about the central axis (B) of the inner space of the venturi dryer (1).
19. The arrangement according to any of the claims 13 to 16, characterized
by the material feeding means (4) comprising three screw feeders (6) comprising a spiral blade (7) rotatable about an rotation axis (C), and
by the three screw feeders (6) being connected to the drying section (3) of the venturi dryer (1) so that the feeding openings (8) between each screw feeder (6) and the drying section (3) of the venturi dryer (1) are positioned substantially 120 degrees with respect to each other about the central axis (B) of the inner space of the venturi dryer (1).
20. The arrangement according to any of the claims 13 to 16, characterized
by the material feeding means (4) comprising four screw feeders (6) comprising a spiral blade (7) rotatable about an rotation axis (C), and
by the four screw feeders (6) being connected to the drying section (3) of the venturi dryer (1) so that the feeding openings (8) between each screw feeder (6) and the drying section (3) of the venturi dryer (1) are positioned substantially 90 degrees with respect to each other about the central axis (B) of the inner space of the venturi dryer (1).
21. The arrangement according to any of the claims 13 to 20, characterized
by each of said at least two screw feeders (6) being connected to the drying section (3) of the venturi dryer (1) so that each of the feeding openings (8) between each screw feeder (6) and the drying section (3) of the venturi dryer (1) are positioned substantially at the same position along the central axis (B) of the inner space of the venturi dryer (1).
22. The arrangement according to any of the claims 13 to 21, characterized
by the material feeding means (4) for feeding particulate material (10) from a particulate material source (5) into the drying section (3) of the venturi dryer (1) comprising at least one screw feeder (6) having a right-handed spiral blade (7), and
by the material feeding means (4) for feeding particulate material (10) from a particulate material source (5) into the drying section (3) of the venturi dryer (1) comprising at least one screw feeder (6) having a left-handed spiral blade (7) .
23. The arrangement according to claim 22, characterized
by said at least one screw feeder (6) having a right-handed spiral blade (7) being connected to the drying section (3) of the venturi dryer (1) and by said at least one screw feeder (6) having a left-handed spiral blade (7) being connected to the drying section (3) of the venturi dryer (1) so that both said at least one screw feeder (6) having a right-handed spiral blade (7) and said at least one screw feeder (6) having a left-handed spiral blade (7) being configured to feed particulate material (10) into the drying section (3) of the venturi dryer (1) at the side of the feeding opening (8) between respective screw feeder (6) and the drying section (3) of the venturi dryer (1) that is at a greater distance from the central axis (B) of the inner space of the venturi dryer (1) than the other side of the feeding opening (8) between respective screw feeder (6) and the drying section (3) of the venturi dryer (1).
24. The arrangement according to any of the claims 13 to 23, characterized by the rotation axis of said at least two screw feeders (6) extending in a mirror-like manner in relation to each other with respect to a plane extending in the direction of the central axis (B) of the inner space of the venturi dryer (1).
25. Use of the method as defined in any of the claims 1 to 12 or the arrangement as defined in any of the claims 13 to 24 for drying particulate material (10) in the form of shale oil.
EP13814485.2A 2013-12-12 2013-12-12 Method and arrangement for drying particulate material and use of the method or of the arrangement Active EP3080534B1 (en)

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CN2615611Y (en) * 2003-05-10 2004-05-12 石家庄工大化工设备有限公司 Venturi dryer

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CA2932975C (en) 2020-07-21
EP3080534B1 (en) 2018-03-14
EA031101B1 (en) 2018-11-30
CA2932975A1 (en) 2015-06-18
WO2015086075A1 (en) 2015-06-18
JO3451B1 (en) 2020-07-05
CN105849489A (en) 2016-08-10
EA201690953A1 (en) 2016-11-30
AU2013407389B2 (en) 2017-07-20
TR201807234T4 (en) 2018-06-21
CN105849489B (en) 2017-10-03

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