WO2019161428A1 - Système de séchage de matériaux - Google Patents

Système de séchage de matériaux Download PDF

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Publication number
WO2019161428A1
WO2019161428A1 PCT/AU2018/050142 AU2018050142W WO2019161428A1 WO 2019161428 A1 WO2019161428 A1 WO 2019161428A1 AU 2018050142 W AU2018050142 W AU 2018050142W WO 2019161428 A1 WO2019161428 A1 WO 2019161428A1
Authority
WO
WIPO (PCT)
Prior art keywords
delivery pipe
inlet
pipe
materials
air
Prior art date
Application number
PCT/AU2018/050142
Other languages
English (en)
Inventor
Gregory AHRBECK
Original Assignee
Ahrko Holdings Pty Ltd
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 Ahrko Holdings Pty Ltd filed Critical Ahrko Holdings Pty Ltd
Priority to PCT/AU2018/050142 priority Critical patent/WO2019161428A1/fr
Priority to AU2018409882A priority patent/AU2018409882A1/en
Publication of WO2019161428A1 publication Critical patent/WO2019161428A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/04—Conveying materials in bulk pneumatically through pipes or tubes; Air slides
    • B65G53/06—Gas pressure systems operating without fluidisation of the materials
    • B65G53/08—Gas pressure systems operating without fluidisation of the materials with mechanical injection of the materials, e.g. by screw
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/40—Feeding or discharging devices
    • B65G53/48—Screws or like rotary conveyors

Definitions

  • This disclosure relates to a system and method for drying bulk materials.
  • the system is described specifically in relation to drying materials such as coal, ores and sands but it will be understood that the system may be utilised for drying any bulk materials.
  • Processes to dry bulk materials such as coal, lignite, ores and sands along with other inorganic and organic bulk materials may allow for more improved storage, more efficient transportation and more efficient use.
  • brown coal or lignite has approximately 66% moisture content.
  • Each tonne (t) of coal produces 2t of water so that when burned lignite has a very low calorific value.
  • Burning lignite requires larger power stations to account for additional steam, has low energy efficiency and is a high producer of carbon emissions as a result. Drying the coal improves the overall efficiency of power generation and delivers calorific content more akin to black coal which attracts a premium price because of its calorific content and efficiency.
  • Australian lignite is amongst the 'wettest' brown coals in the world, but brown coal deposits are significant in Germany and Indonesia. Developing a process to dry lignite opens up access to premium coal markets by improving power station efficiency and reducing carbon emissions.
  • Brown coal as a primary energy source in Australia will become increasingly important in energy supplies in the future because of its abundance, easy access and low mining cost. Therefore, there is considerable interest in the drying of coal prior to transport and usage.
  • Some technologies involve squeezing the water out of the coal, others involve heating the coal with steam via fluid bed drying processes, microwaving, or through a combination of pressure and high temperature.
  • evaporative drying technologies for coal that are in principle suited for coal drying, each with their respective merits.
  • Hot air, combustion flue gas or superheated steam may be used as the heating medium during the convective and evaporative drying process.
  • Coal is highly reactive and more susceptible to fire and explosion hazards due to spontaneous combustion.
  • Each of these technologies is high cost, delivers inconsistent outputs, and cannot deliver throughput at a sufficient scale production to drive higher volume lower price, high margin returns.
  • sand is an integral element in an array of manufactured products and industrial practices, ranging from cement to the production of silicon chips for PV panels, other electronics, glass manufacture and fracking. Drying the sand is initially required in the process of producing various types and grades. Again primarily heat based technologies such as rotary kilns are used which are costly both in the initial capital outlay and ongoing running costs. Again there is a high and continuing demand for an economical solution to drying sands.
  • SUMMARY Disclosed is a system for drying bulk materials such as, for example, coal and coal fines, lignite, petroleum coke, mineral and ore-bearing sand, sands or ores, gravel, plaster, slag, salts, grains and bulk foodstuffs.
  • bulk materials such as, for example, coal and coal fines, lignite, petroleum coke, mineral and ore-bearing sand, sands or ores, gravel, plaster, slag, salts, grains and bulk foodstuffs.
  • the system uses principles of conveyance in a swirling pipe material dryer and applies them to drying bulk materials.
  • an apparatus for drying bulk materials using a swirling flow comprising a delivery pipe configured to convey bulk materials from an inlet end to an outlet end in an induced swirling flow; an air inlet configured to introduce air or a gaseous fluid into the delivery pipe such that a swirling flow is induced in the delivery pipe; a materials inlet configured to introduce bulk materials to the delivery pipe; wherein an air stream into the delivery pipe induced by the air inlet is out of line with the material stream induced by the materials inlet.
  • the materials stream enters the delivery pipe through an end of the delivery pipe while the air stream enters the delivery pipe through a peripheral wall of the delivery pipe at a location proximal the end of the delivery pipe.
  • the air inlet comprises at least two inlet ducts spaced apart around the perimeter of the delivery pipe.
  • Fig. 1 shows an overview of the system of one embodiment of the disclosure
  • Fig. 2 shows a perspective view of a delivery pipe assembly and cyclone of one embodiment of the disclosure
  • Fig. 3 shows a perspective view of the delivery pipe assembly of Fig. 2 with a swirling vortex therein;
  • Fig. 4 shows a cross-sectional plan view of a delivery pipe inlet of one embodiment of the disclosure from the top;
  • Fig. 5 shows a cross sectional side view of the delivery pipe inlet of Fig. 4
  • Fig. 6 shows a cross-sectional plan view of a delivery pipe inlet of one embodiment of the disclosure from above;
  • Fig. 7 shows a cross sectional side view of the delivery pipe inlet of Fig. 6;
  • Fig. 8 graphs experimental measurements of pipe centreline velocities at various generator speeds
  • Fig. 11 graphs temperature variation at differing pipe lengths.
  • an apparatus for drying bulk materials using a swirling flow comprising a delivery pipe configured to convey bulk materials from an inlet end to an outlet end in an induced swirling flow; an air inlet configured to introduce air or a gaseous fluid into the delivery pipe such that a swirling flow is induced in the delivery pipe; a materials inlet configured to introduce bulk materials to the delivery pipe; wherein an air stream into the delivery pipe induced by the air inlet is out of line with the material stream induced by the materials inlet.
  • the configuration of the inlet assembly is such that the air stream and materials stream are angled with respect to one another, for example the air stream enters the delivery pipe at an angle while the material inlet enters the pipe substantially aligned with the pipe.
  • the configuration allows for separate streams of material and air resulting in lower wear and a more controlled swirl and flow rate.
  • a configuration with a plurality of pipes entering through the periphery of the delivery pipe while the materials enter at one end of the pipe allows for the impeller or air stream to be out of line with the material flow.
  • the materials stream enters the delivery pipe through an end of the delivery pipe while the air stream enters the delivery pipe through a peripheral wall of the delivery pipe at a location proximal the end of the delivery pipe.
  • the air inlet comprises at least two inlet ducts spaced apart around the perimeter of the delivery pipe.
  • the inlet ducts are oriented such that air entering the delivery pipe enters at an angle with respect to a radius of the pipe. In some forms the inlet ducts are angled away from parallel with respect to the pipe. In some forms the inlet ducts are angled to between 90° and 180° with respect to the pipe.
  • the inlet ducts are oriented such that air entering the pipe is directed at an angle close to parallel to an inner surface of the pipe. In some forms the inlet ducts have at least two different diameters.
  • the materials inlet and the air inlet are angled away from parallel with respect to one another.
  • the air inlet is angled with respect to the delivery pipe such that inlet ducts extending from the air inlet meet the delivery pipe at an acute angle with respect to the horizontal
  • the apparatus further comprises a mixing chamber from which the material is delivered to the materials inlet.
  • the apparatus further comprises a cyclone unit engaged with the delivery pipe such that materials exiting the delivery pipe enter the cyclone unit for further drying.
  • the air stream is out of line with the materials stream in more than one plane.
  • Disclosed is a method of drying bulk materials using a swirling flow comprising inducing a swirling flow in a delivery pipe through introduction of an air stream into the delivery pipe; delivering bulk materials to the delivery pipe through a materials stream; conveying the bulk materials in the delivery pipe in the induced swirling flow; wherein the materials stream and the air stream are off set from one another.
  • the bulk materials are delivered to an end of the pipe and the air is delivered through a peripheral wall of the pipe at a position proximal the end of the pipe.
  • an inlet assembly for an apparatus for drying bulk materials using a swirling flow, the inlet assembly comprising a materials inlet for introducing a materials stream to a delivery pipe and an air inlet for introducing an air stream to the delivery pipe, the air stream being out of line with the materials stream at entry.
  • the materials inlet introduces a materials stream at an end of the pipe and the air inlet introduces an air stream through a peripheral wall of the pipe.
  • a drying system 1 comprises a bulk materials delivery apparatus 2 configured to deliver bulk materials to a mixing chamber.
  • the materials delivery apparatus 2 in some forms includes a one-way valve to prevent blowback of materials from the system.
  • the one-way valve may be in the form of a rotary lock valve which operates on similar principles to a revolving door.
  • the one-way valve may be in the form of an extruder discharge screw, a flap valve or a counterweight valve, or any valve which acts in one direction and allows flow of bulk materials into the mixing chamber 3.
  • the material is delivered from the mixing chamber 3 into a delivery pipe 4 which is elongate.
  • the delivery pipe has a circular cross-sectional area.
  • material is delivered to the delivery pipe by means of an augur which moves material into the delivery pipe. It will be clear that alternatives to an augur are available .
  • a swirling vortex or spiral flow is created in the delivery pipe by means of air (or other fluid) delivery into the pipe.
  • the air is input into the delivery pipe 4 in the illustrated form by means of a dual pipe inlet 5 (not shown in Fig. 1).
  • the delivery pipe 4 extends from the mixing chamber 3 to a cyclone 8.
  • the material moves along the delivery pipe in a swirling vortex and is dried by conveyance within the vortex.
  • a cyclone unit 8 is attached at the exit of the delivery pipe 4. This may have the benefit of increasing drying without using a very long pipe.
  • the cyclone unit includes a plurality of outlets. Some flow is observed to leave the cyclone unit through the bottom outlet while the others is found to rise into the centre pipe inside the cyclone unit and leave through the top outlet.
  • the delivery pipe 4 is defined by a peripheral wall 9 having a perimeter extending about the pipe 4.
  • the inlet assembly 10 comprises a dual air inlet 5 engaged with and in communication with the delivery pipe.
  • the dual air inlet 5 is designed to deliver air or an alternative gas to the delivery pipe 4 and comprises a first inlet duct 11 and a second inlet duct 12 each entering the delivery pipe.
  • the first and second ducts 11 and 12 enter the delivery pipe 4 at an angle to the pipe. That is, the first and second inlet ducts are neither parallel to nor perpendicular with the delivery pipe but enter the delivery pipe at an angle of between 90 degrees and 180 degrees with respect to the pipe. Moreover, the first and second input pipes enter the delivery pipe 4 at locations that are spaced apart around the perimeter of the delivery pipe 4. In some forms the locations are offset with respect to one another.
  • the delivery pipe 4 extends to the cyclone unit 8.
  • Fig. 3 shows the delivery pipe of Fig. 2 and includes streamline tracers to show direction and velocity of the flow.
  • the air flow instigated by the dual inlet duct 5 creates a swirling vortex having a helical shape in the pipe 4.
  • the velocity and angle of the swirl decreases through swirl decay as the swirl moves through the pipe so that on entry the vortex has a high velocity and a tight helical shape while at the distal or output end of the pipe 4 the vortex is looser and the velocity slower.
  • strong swirl is shown at the beginning of the horizontal pipe, which decays quite quickly to very little swirl at the entrance to the cyclone unit.
  • the inlet assembly 10 comprises a materials inlet 16 in the form of a materials inlet duct 17 containing an augur 18 which is adapted to rotate about the longitudinal axis of the material inlet duct 17 to deliver bulk material to the delivery pipe 4.
  • the materials inlet 16 is adapted to put the materials delivery apparatus 2 in communication with the delivery pipe 4 for movement of materials from the delivery apparatus 2 to the delivery pipe 4.
  • the inlet assembly 10 further comprises a dual air inlet 5 which delivers air or an alternative gas under force into the delivery pipe 4.
  • the air inlet 5 comprises a first inlet duct 11 and a second inlet duct 12.
  • the first inlet duct 11 enters the delivery pipe 4 through the peripheral wall of the delivery pipe 4 at inlet position 13 while the second inlet duct 12 enters the delivery pipe 4 through the peripheral wall of the delivery pipe 4 at inlet position 14.
  • the inlet ducts 11 and 12 are angled with respect to the delivery pipe 14.
  • the materials inlet 16 extends substantially in line with the delivery pipe while the air inlet 5 is angled to the x axis with respect to the delivery pipe.
  • the air inlet 5 slopes down toward the delivery pipe in ordinary use. This has the benefit of allowing the air inlet and the materials inlet to avoid interference with one another while the material and air enters the pipe in a position proximal to one another.
  • the angle of entry is an acute angle with respect to the horizontal x axis.
  • the first inlet duct 11 enters the delivery pipe at 8° to the horizontal.
  • the second inlet duct 12 enters the delivery pipe at 10° to the horizontal.
  • the entry of the inlet ducts 11 and 12 are also angled in the horizontal plane, that is the inlet ducts 11 and 12 enter the delivery pipe 4 at between 90° and 180° angling into the delivery pipe 4 from either side.
  • the air comes from a single air pipe 19 but it will be clear that multiple impellers or air pipes may be utilised to deliver air or other gas to the system.
  • the angle of entry allows for creation of the swirling vortex within the delivery pipe while the impeller or air inlet assembly is out of line with the material flow.
  • a 10 m straight pipe section is utilised as a delivery pipe.
  • the pipe may be extended, for example, to 20 m and a constant mass flow rate applied at the inlet boundary to achieve a constant pipe centreline velocity of 55 m/s (equivalent to a generator speed of 750 rpm in the experiment).
  • a velocity measurement was performed at 40 m pipe length and speed of 450 and 600 rpm. Weak velocity swirl was measured. As later observed however, the swirl strength did not seem sufficient to circulate the sand grains (heavy particles) at this length.
  • coal was circulated through the system.
  • the cyclone was installed, following pipe length of roughly 24 m. Since the cyclone structure is tall, inlet from pipe is roughly 5 m above the ground. This made the pipe curve upwards from length 7 - 24 m, with approximate angle of 25 - 30°. Coal particles were tested throughout, with and without the cyclone. The dryness results can be referred to the table provided by GHD.
  • the bulk material may be granulated prior to drying or may be divided according to particle size.

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

Abstract

L'invention concerne un appareil et un procédé pour sécher des matériaux en vrac à l'aide d'un écoulement tourbillonnant, l'appareil et le procédé utilisant un flux d'air pour induire un écoulement tourbillonnant.
PCT/AU2018/050142 2018-02-21 2018-02-21 Système de séchage de matériaux WO2019161428A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/AU2018/050142 WO2019161428A1 (fr) 2018-02-21 2018-02-21 Système de séchage de matériaux
AU2018409882A AU2018409882A1 (en) 2018-02-21 2018-02-21 Materials drying system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/AU2018/050142 WO2019161428A1 (fr) 2018-02-21 2018-02-21 Système de séchage de matériaux

Publications (1)

Publication Number Publication Date
WO2019161428A1 true WO2019161428A1 (fr) 2019-08-29

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Country Status (2)

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AU (1) AU2018409882A1 (fr)
WO (1) WO2019161428A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0099653A2 (fr) * 1982-06-29 1984-02-01 World Institute Of Technology Système pour le transport et le traitement de marchandises en vrac
EP0775652A1 (fr) * 1995-11-23 1997-05-28 Dynasty TMT Corporation Système et méthode pour transporter des produits en vrac

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0099653A2 (fr) * 1982-06-29 1984-02-01 World Institute Of Technology Système pour le transport et le traitement de marchandises en vrac
EP0775652A1 (fr) * 1995-11-23 1997-05-28 Dynasty TMT Corporation Système et méthode pour transporter des produits en vrac

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Publication number Publication date
AU2018409882A1 (en) 2020-09-24

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