WO2003052336A1 - Apparatus for drying a particulate product with superheated steam - Google Patents

Apparatus for drying a particulate product with superheated steam Download PDF

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Publication number
WO2003052336A1
WO2003052336A1 PCT/DK2002/000825 DK0200825W WO03052336A1 WO 2003052336 A1 WO2003052336 A1 WO 2003052336A1 DK 0200825 W DK0200825 W DK 0200825W WO 03052336 A1 WO03052336 A1 WO 03052336A1
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WO
WIPO (PCT)
Prior art keywords
drying chamber
drying
particulate product
vapour
product
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.)
Ceased
Application number
PCT/DK2002/000825
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French (fr)
Inventor
Børge Holm CHRISTENSEN
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.)
Holm Christensen Biosystemer APS
Original Assignee
Holm Christensen Biosystemer APS
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 Holm Christensen Biosystemer APS filed Critical Holm Christensen Biosystemer APS
Priority to AU2002366390A priority Critical patent/AU2002366390A1/en
Priority to BRPI0215005-0A priority patent/BR0215005B1/en
Priority to US10/499,088 priority patent/US20050155249A1/en
Priority to DK02804853T priority patent/DK1466131T3/en
Priority to DE60217183T priority patent/DE60217183T2/en
Priority to EP02804853A priority patent/EP1466131B1/en
Publication of WO2003052336A1 publication Critical patent/WO2003052336A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B7/00—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00
    • 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
    • F26B17/18—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs
    • F26B17/20—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rotating helical blades or other rotary conveyors which may be heated moving materials in stationary chambers, e.g. troughs the axis of rotation being horizontal or slightly inclined
    • 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
    • F26B3/06—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 flowing through the materials or objects to be dried

Definitions

  • Apparatus for drying a particulate product with superheated vapour Apparatus for drying a particulate product with superheated vapour.
  • Apparatus for evaporation of a liquid contained in a particulate product by means of superheated vapour as the drying medium comprising a drying chamber and a heat exchanger and a device for separation of product particles and low temperature vapour, pressuretight connected to each other and communicating with the surroundings through a loading device for Q particulate product, an unloading device for particulate product and an outlet device for the generated surplus of low temperature vapour characterized in
  • a rotor inside the drying chamber is elevating portions of the particulate product from the lower to the upper part of the drying chamber from where the portions fall down to the lower part of the drying chamber, through the current of superheated vapour
  • the most common liquid will be water, and the superheated vapour will then be superheated steam mixed with small amounts of volatile components from the particulate product
  • the liquid will not be water, but for example an organic 5 inflammable solvent
  • the apparatus according to the invention can be used to evaporate the major part of the same liquid by means of superheated vapour of the same liquid and thereafter to evaporate the remaining part of the liquid by means of superheated steam
  • the liquid can be mixtures of water and other liquids, such as ethanol Background
  • Drying with superheated vapour is a well established technology with examples of industrial applications within drying of sugar beet pulp and cellulose pulp.
  • the existing apparatus for drying with superheated vapour differ in the way -10 the above mentioned unit operations are conducted.
  • the pressure of the dryer can be higher or lower than the ambient 1 5 pressure or it can be equal to the ambient pressure. Dryers with higher or lower pressure than the ambient pressure demand pressure locks in connection with loading and unloading of the particulate product.
  • the pressure locks can be based on different principles.
  • the contact between the product particles and the superheated vapour, and the transport of the particulate product through the drying chamber can be arranged in different ways.
  • the drying chamber and the heat exchanger can be separate units or they can be integrated to one unit.
  • the inlet of the superheated vapour into the drying chamber can be at the same end as the inlet of the particulate product (co-current drying) or 0 it can be at the opposite end (counter-current drying).
  • EP 0 058 651 B1 disclose a dryer wherein the the contact between the product particles and the superheated vapour is accomplished by suspending the particulate product in the superheated vapour and pneumatically transport 5 the particulate product through the pressurized dryer comprising a number of vertical tube and shell heat exchangers connected by pipes This means, that the drying of the particulate product and the reheating of the vapour are completely integrated and simultanous
  • the quantity of particulate product per m3 of the drying chamber is very low and therefore this type of dryer are only suitable for products with small particles wich can be dried within a retention time shorter than 1 minute
  • the retention time for the particulate product in each section can be cotrolled and to some degree provide a shorter retention time for smaller particles than for the larger particles
  • PCT/DK99/00196 disclose a similar design of the dryer, but the low temperature vapour entrance of the cyclone has been moved upwards, and the ringshaped fluidized bed has got a curved bottom plate This is claimed to improve drying of coarse particles without overdrying medium and smaller particles, and providing a better investment capacity ratio than the apparatus disclosed in US 5,357,686
  • Rotary dryers working with hot air as drying medium have been used for more than a century for drying of a wide range of particulate products
  • Rotary dryers working with superheated vapour as drying medium have been used in a few cases during the last decade, and are commercial available from companies such as W Kunz Drytec AG, CH-5606 Dinticon, or Atlas Industries A/S Baltorpvej 160, DK- 2750 Ballerup
  • the drying chamber (the rotary shell) is connected to the heat exchanger and the separation device by seals which are not pressuretight
  • the contact between the product particles and the superheated vapour in the rotary shell is achieved by a se ⁇ e of falls of the particulate product from the upper part of the rotary shell through the current of superheated vapour moving from the inlet end to the outlet end of the rotary shell
  • the product particles are moved a step towards the outlet, the length of which depends of the velocity of the superheated vapour and the weight and form of the individual particles
  • the product particles are either resting at the lower part of the shell or being elevated to the upper part of the rotary shell by baffles placed ho ⁇ sontally on the inner side of the rotary shell, from where it will again fall through the superheated vapour
  • Pulsatory drying provides uniform drying of heterogenous particulate product, where the needed retention time for the smallest particles may be few seconds, whereas it may be 30 minutes or more for the largest particles.
  • the very long retention time for large paticles is possible because a great quantity of particulate product can be accumulated at the lower part of the rotary shell.
  • the aim of the apparatus according to the invention is to integrate pulsatory drying and drying with superheated vapour in a complete pressuretight drying system.
  • a preferred embodiment of the rotor comprises an axis placed parallel to the axis of the drying chamber, equipped with a number of radial beams carrying baffles at the end away from the axis
  • the axis of the rotor is placed in such a manner, that the baffles will pass close to the shell and collect some particulate product when they pass through the lower part of the drying chamber, and will pass with some distance to the shell, when they move through the upper part of the drying chamber, which will allow the product particles to slip out into the space between the baffles and the shell from where it will fall down through the superheated vapour This will occur when the rotation speed is increased to a level where the impact on the particulate product of the centrifugal force is stronger than the gravity force When the gravity force is the strongest the product particles will fall directly from the baffle
  • a preferred embodiment of the invention comp ⁇ ces a cylind ⁇ c drying chamber inside which a cylind ⁇ c rotary shell is placed conaxially with the drying chamber
  • the rotary shell can rotate freely inside the stationary drying chamber but the space between the two cylinders is very narrow Support and rotation of the rotary shell are achieved by well known devices
  • Loading and unloading of the drying apparatus according to the invention can be conducted by well known devices such as rotary locks or plug flow feeders
  • none of the known devices are suitable Examples are cereal straw, household waste, brown coal, wood chips, bark and byproducts from slaughter houses
  • the apparatus according the invention can be equipped with loading and unloading system described in patent application P A 2000 01183 filed 08 08 2000
  • the loading/unloading system described in P A 2000 01183 is based on a sluice system according to which the product is first conveyed through a portioning device, which produces a sequence of uniform product portions divided by uniform particle free spaces, and subsequently the product portions are conveyed individually through a sluice device, which comprises at least one sluice chamber and two pressure locks of which at least one at any time secures a pressure tight barrier between the two pressure zones, and wherein the product portions are force loaded from the first zone into a sluice chamber by means of a piston screw, the axis of which is practically in Ime with the axis of the sluice chamber, and wherein the product portions are force unloaded from the sluice chamber and into the second pressure zone by means of said piston screw or a piston or by means of gas, vapour or liquid supplied at a pressure higher than that of the second pressure zone
  • a preferred embodiment uses a screw press, pressuretight connected to the drying chamber, both as dewate ⁇ ng device and as loading device
  • a preferred embodiment of the invention uses a pellet press, pressuretight connected to the drying chamber, both for unloading and for pelletizing Detailed description
  • Example 1 describes an embodiment preferred when the liquid can move quickly from the core of the particles to the surface, and the demand for resting time therefore is low
  • Fig 1a and 1b are illustrating example 1 Fig 1a is a longitude section of the apparatus, fig 1b is a cross section of the drying chamber
  • the particulate product is loaded into the drying chamber 1 2 by means of a loading device 1 1 , Patent application P A 2000 01183
  • the particulate product is elevated by means of the rotor baffles 1 5 connected with beams 1 4 to the rotor axis 1 3
  • the particulate product falls into a hopper 1 7 with a screw conveyor 1 6, wich conveys the particulate product to the unloading device 1 12, similar to 1 1
  • the superheated vapour pass through a cyclone 1 8 where it is separated from the fines which are led to the hopper 1 7
  • the movement of the superheated vapour is achieved by means of the fan 1 9
  • Example 2 describes an embodiment preferred when the liquid moves slowly form the core of the particles to the surface and the demand for resting time at the lower part of the drying chamber therefore is high
  • Fig 2a and 2b are illustrating example 2
  • Fig 2a is a longitude section of the apparatus
  • fig 2b is a cross section of the drying chamber
  • the particulate product is loaded into the drying chamber 2 2 by means of a loading device 2 1 , similar to 1 1
  • the rotor 2 4 in the drying chamber 2 2 consist of a rotary shell in which the particulate product is elevated by means of the rotor baffles 2 5 connected to the inside of the rotary shell 2 4 Rotation of the rotary shell is achieved by known means
  • the particulate product falls into a hopper 2 7 with a screw conveyor 2 6, wich conveys the particulate product to the unloading device 2 12
  • the superheated vapour pass through a cyclone 2 8 where it is separated from the fines which are led to the hopper 2 7
  • the movement of the superheated vapour is achieved by means of the fan 2 9

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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)
  • Freezing, Cooling And Drying Of Foods (AREA)

Abstract

Apparatus for evaporation of a liquid contained in a particulate product by means of superheated vapour as the drying medium, comprising a drying chamber and a heat exchanger and a device for separation of product particles and low temperature vapour, pressuretight connected to each other and communicating with the surroundings through a loading device for particulate product, an unloading device for particulate product and an outlet device for the generated surplus of low temperature vapour characterized in - that the drying chamber by and large has the shape of a cylinder, and - that the drying chamber has a horizontal position or has a minor deviation from that, and - that a rotor inside the drying chamber is elevating portions of the particulate product from the lower to the upper part of the drying chamber from where the portions fall down to the lower part of the drying chamber, through the current of superheated vapour.

Description

Apparatus for drying a particulate product with superheated vapour.
5 Apparatus for evaporation of a liquid contained in a particulate product by means of superheated vapour as the drying medium, comprising a drying chamber and a heat exchanger and a device for separation of product particles and low temperature vapour, pressuretight connected to each other and communicating with the surroundings through a loading device for Q particulate product, an unloading device for particulate product and an outlet device for the generated surplus of low temperature vapour characterized in
- that the drying chamber by and large has the shape of a cylinder, and
- that the drying chamber has a horizontal position or has a minor deviation from that, and 5 - that a rotor inside the drying chamber is elevating portions of the particulate product from the lower to the upper part of the drying chamber from where the portions fall down to the lower part of the drying chamber, through the current of superheated vapour
o The most common liquid will be water, and the superheated vapour will then be superheated steam mixed with small amounts of volatile components from the particulate product
In some cases the liquid will not be water, but for example an organic 5 inflammable solvent In such cases the apparatus according to the invention can be used to evaporate the major part of the same liquid by means of superheated vapour of the same liquid and thereafter to evaporate the remaining part of the liquid by means of superheated steam
0 In other cases the liquid can be mixtures of water and other liquids, such as ethanol Background
Drying with superheated vapour is a well established technology with examples of industrial applications within drying of sugar beet pulp and cellulose pulp.
The advantages by drying in superheated vapour are mainly:
1. Very high energy efficiency in cases where the energy in the vapour generated by the drying process can be exploited by condensation in energy consuming processes such as evaporation or distillation.
2. Very low air pollution compared with drying with air as the drying medium.
3. High product quality and no product loss in cases where oxidation of the particulate product is a problem.
4. High safety when the liquid to be removed from the particulate product is inflammable.
5. Simultanous sterilisation and drying is possible.
Prior art
Existing apparatus for drying with superheated vapour conduct the following unit operations:
1. Loading the particulate product into the drying chamber.
2. Transport of superheated vapour through the drying chamber.
3. Transport of the particulate product through the drying chamber with efficient contact to the superheated vapour. 4. Separation of product particles and low temperature vapour.
5. Unloading of the particulate product from the drying chamber.
5 6. Reheating and recycling of low temperature vapour.
7. Discharge of the generated surplus of low temperature vapour.
The existing apparatus for drying with superheated vapour differ in the way -10 the above mentioned unit operations are conducted.
The most important differences are:
1. The pressure of the dryer can be higher or lower than the ambient 15 pressure or it can be equal to the ambient pressure. Dryers with higher or lower pressure than the ambient pressure demand pressure locks in connection with loading and unloading of the particulate product.
2. The pressure locks can be based on different principles.
20
The contact between the product particles and the superheated vapour, and the transport of the particulate product through the drying chamber can be arranged in different ways.
5 4. The drying chamber and the heat exchanger can be separate units or they can be integrated to one unit.
5. The inlet of the superheated vapour into the drying chamber can be at the same end as the inlet of the particulate product (co-current drying) or 0 it can be at the opposite end (counter-current drying).
EP 0 058 651 B1 disclose a dryer wherein the the contact between the product particles and the superheated vapour is accomplished by suspending the particulate product in the superheated vapour and pneumatically transport 5 the particulate product through the pressurized dryer comprising a number of vertical tube and shell heat exchangers connected by pipes This means, that the drying of the particulate product and the reheating of the vapour are completely integrated and simultanous The quantity of particulate product per m3 of the drying chamber is very low and therefore this type of dryer are only suitable for products with small particles wich can be dried within a retention time shorter than 1 minute
In US Patent 5 357,686 the contact between the product particles and the superheated vapour is accomplished in a vertical ringshaped sectionized fluid bed drying chamber Reheating of the low tempeature vapour is accomplished by a tube and shell heat exchanger placed in the center of the drying chamber The superheated vapour enters through the perforated bottom of the drying chamber Separation of the product particles from the low temperature vapour occurs at the top of the drying chamber and after removal of fines in a cyclone, a part of the low temperature vapour is recycled through the heat exchanger, while the remaining part is discharged to external utilization
By adjusting the flow of superheated vapour in the vertical sections of the drying chamber the retention time for the particulate product in each section can be cotrolled and to some degree provide a shorter retention time for smaller particles than for the larger particles
PCT/DK99/00196 disclose a similar design of the dryer, but the low temperature vapour entrance of the cyclone has been moved upwards, and the ringshaped fluidized bed has got a curved bottom plate This is claimed to improve drying of coarse particles without overdrying medium and smaller particles, and providing a better investment capacity ratio than the apparatus disclosed in US 5,357,686
The quantity of particulate product per m3 of the drying chamber is low, and therefore this type of dryer has its best performance by products with particles which can be dried within a retention time shorter than 10 minutes All three dryers described above are operating at a pressure of 2-6 bar to achieve increased evaporation capacity per nrι3 of drying chamber
Rotary dryers working with hot air as drying medium have been used for more than a century for drying of a wide range of particulate products Rotary dryers working with superheated vapour as drying medium have been used in a few cases during the last decade, and are commercial available from companies such as W Kunz Drytec AG, CH-5606 Dinticon, or Atlas Industries A/S Baltorpvej 160, DK- 2750 Ballerup
By these dryers the drying chamber (the rotary shell) is connected to the heat exchanger and the separation device by seals which are not pressuretight The contact between the product particles and the superheated vapour in the rotary shell is achieved by a seπe of falls of the particulate product from the upper part of the rotary shell through the current of superheated vapour moving from the inlet end to the outlet end of the rotary shell During a fall, the product particles are moved a step towards the outlet, the length of which depends of the velocity of the superheated vapour and the weight and form of the individual particles Between the falls, the product particles are either resting at the lower part of the shell or being elevated to the upper part of the rotary shell by baffles placed hoπsontally on the inner side of the rotary shell, from where it will again fall through the superheated vapour
The dryers from W Kunz Drytec AG and Atlas Industries A/S are co-current dryers, but an example of a counter-current dryer is described in "Unit
Operations of Chemical Engineering" McGraw-Hill, International Editions 1987 p 732-733 This dryer is working with heated air as drying medium, but could in principle be working with superheated vapour During counter- current drying, the drying medium will give a negative contribution to the transport of particulate product through the drying chamber To compensate for this, the rotary shell is sloping so the outlet end for the particulate product is lower than the inlet end During a fall of a particle the transfer rate for energy from the superheated vapour to the particle is very high, reducing the content of liquid in the surface layer to a lower level than inside the particle. When the particulate product is located at the lower part of the drying chamber, the transfer rate for energy from the superheated vapour to the particulate product is low, which gives time for the liquid to move from the inner part of the particle to the surface.
This drying principle characterized by alternating periods with high and low drying rate, is in the following called pulsatory drying.
Pulsatory drying provides uniform drying of heterogenous particulate product, where the needed retention time for the smallest particles may be few seconds, whereas it may be 30 minutes or more for the largest particles. The very long retention time for large paticles is possible because a great quantity of particulate product can be accumulated at the lower part of the rotary shell.
Furthermore the pulsatory drying will allow for higher inlet temperatures without thermal detonation of the product.
None of the existing rotary dryers working with superheated vapour as a drying medium can operate at pressures different from the atmospheric pressure, because efficient seals between the rotary shell and the stationary equipment connected to it have not been available. Therefore these dryers operate at the atmospheric pressure or a little lower to avoid emissions. This means, that the vapour generated by the drying process has a low - temperature and is diluted with air, which reduces the application value of the vapour substantially.
The aim of the apparatus according to the invention is to integrate pulsatory drying and drying with superheated vapour in a complete pressuretight drying system. Thereby all the well known advantages by drying with superheated vapour can be exploited to full extent and be combined with the advantages by pulsatory drying. Surprisingly it has been possible to establish pulsatory drying with superheated vapour in a complete pressuretight drying system without innovating new efficient seals between the rotary shell and the stationary equipment The apparatus according to the invention do not apply seals in this connection at all Instead the drying chamber by and large has the shape of a horizontal cylinder inside wich is placed a rotor The rotor elevates the particulate product from the lower part of the drying chamber to the upper part from where it falls down through the current of superheated vapour as required to conduct pulsatory drying
The rotor and the drying chamber can be designed in different ways depending on the nature of the particulate product When the liquid can move quickly from the core of the particles to the surface, and the demand for resting time therefore is low, a preferred embodiment of the rotor comprises an axis placed parallel to the axis of the drying chamber, equipped with a number of radial beams carrying baffles at the end away from the axis The axis of the rotor is placed in such a manner, that the baffles will pass close to the shell and collect some particulate product when they pass through the lower part of the drying chamber, and will pass with some distance to the shell, when they move through the upper part of the drying chamber, which will allow the product particles to slip out into the space between the baffles and the shell from where it will fall down through the superheated vapour This will occur when the rotation speed is increased to a level where the impact on the particulate product of the centrifugal force is stronger than the gravity force When the gravity force is the strongest the product particles will fall directly from the baffles
When the liquid moves slowly form the core of the particle to the surface and the demand for resting time at the lower part of the drying chamber therefore is high, a preferred embodiment of the invention compπces a cylindπc drying chamber inside which a cylindπc rotary shell is placed conaxially with the drying chamber The rotary shell can rotate freely inside the stationary drying chamber but the space between the two cylinders is very narrow Support and rotation of the rotary shell are achieved by well known devices Loading and unloading of the drying apparatus according to the invention can be conducted by well known devices such as rotary locks or plug flow feeders However for some particulate products none of the known devices are suitable Examples are cereal straw, household waste, brown coal, wood chips, bark and byproducts from slaughter houses
In such cases the apparatus according the invention can be equipped with loading and unloading system described in patent application P A 2000 01183 filed 08 08 2000
The loading/unloading system described in P A 2000 01183 is based on a sluice system according to which the product is first conveyed through a portioning device, which produces a sequence of uniform product portions divided by uniform particle free spaces, and subsequently the product portions are conveyed individually through a sluice device, which comprises at least one sluice chamber and two pressure locks of which at least one at any time secures a pressure tight barrier between the two pressure zones, and wherein the product portions are force loaded from the first zone into a sluice chamber by means of a piston screw, the axis of which is practically in Ime with the axis of the sluice chamber, and wherein the product portions are force unloaded from the sluice chamber and into the second pressure zone by means of said piston screw or a piston or by means of gas, vapour or liquid supplied at a pressure higher than that of the second pressure zone
In cases where the particulate product is subjected to mechanical dewateπng before drying in the apparatus according to the invention, a preferred embodiment uses a screw press, pressuretight connected to the drying chamber, both as dewateπng device and as loading device
In cases where the particulate product after drying in the apparatus according to the invention has to be pelletized a preferred embodiment of the invention uses a pellet press, pressuretight connected to the drying chamber, both for unloading and for pelletizing Detailed description
In the following the invention is described in details by means of two co- current embodiments with different rotor types
Example 1 describes an embodiment preferred when the liquid can move quickly from the core of the particles to the surface, and the demand for resting time therefore is low Fig 1a and 1b are illustrating example 1 Fig 1a is a longitude section of the apparatus, fig 1b is a cross section of the drying chamber
The particulate product is loaded into the drying chamber 1 2 by means of a loading device 1 1 , Patent application P A 2000 01183 In the drying chamber 1 2 the particulate product is elevated by means of the rotor baffles 1 5 connected with beams 1 4 to the rotor axis 1 3 At the outlet end of the drying chamber, the particulate product falls into a hopper 1 7 with a screw conveyor 1 6, wich conveys the particulate product to the unloading device 1 12, similar to 1 1
The superheated vapour pass through a cyclone 1 8 where it is separated from the fines which are led to the hopper 1 7 The movement of the superheated vapour is achieved by means of the fan 1 9
The surplus of vapour is discharged through the outlet valve 1 10, arid the rest of the vapour is reheated in the heat exchanger 1 11 and conducted into the drying chamber 1 2 The supply of primary energy to the heat exchanger is not shown
Example 2 describes an embodiment preferred when the liquid moves slowly form the core of the particles to the surface and the demand for resting time at the lower part of the drying chamber therefore is high Fig 2a and 2b are illustrating example 2 Fig 2a is a longitude section of the apparatus, fig 2b is a cross section of the drying chamber
The particulate product is loaded into the drying chamber 2 2 by means of a loading device 2 1 , similar to 1 1 The rotor 2 4 in the drying chamber 2 2 consist of a rotary shell in which the particulate product is elevated by means of the rotor baffles 2 5 connected to the inside of the rotary shell 2 4 Rotation of the rotary shell is achieved by known means At the outlet end of the drying chamber, the particulate product falls into a hopper 2 7 with a screw conveyor 2 6, wich conveys the particulate product to the unloading device 2 12
The superheated vapour pass through a cyclone 2 8 where it is separated from the fines which are led to the hopper 2 7 The movement of the superheated vapour is achieved by means of the fan 2 9
The surplus of vapour is discharged through the outlet valve 2 10, and the rest of the vapour is reheated in the heat exchanger 2 11 and conducted into the drying chamber 2 2 The supply of primary energy to the heat exchanger is not shown

Claims

Claims:
1. Apparatus for evaporation of a liquid contained in a particulate product by means of superheated vapour as the drying medium, comprising a drying chamber and a heat exchanger heat exchanger and a device for separation of product particles and low temperature vapour, pressuretight connected to each other and communicating with the surroundings through a loading device for particulate product, an unloading device for particulate product and an outlet device for the generated surplus of low temperature vapour characterized in
- that the drying chamber by and large has the shape of a cylinder, and
- that the drying chamber can be in a horizontal position or have a minor deviation from that, and
- that a rotor inside the drying chamber is elevating portions of the particulate product from the lower to the upper part of the drying chamber from where the portions fall down to the lower part of the drying chamber, through the current of superheated vapour.
2. Apparatus according to claim 1. wherein the rotor comprises a central axis with radial beams and elevating baffles connected to the beams.
3. Apparatus according to claim 1. wherein the rotor comprises a rotary shell with elevating baffles connected to the inner cylindric wall of the shell.
4. Apparatus according to claim 1. wherein the loading is carried out by a screw press, pressuretight connected to the drying chamber and wherein the screw press is providing mechanical dewatering of the particulate product before the drying process.
5. Apparatus according to claim 1. wherein the loading is carried out by a particle pump described in Patent application P. A. 200001183.
6. Apparatus according to claim 1. wherein the unloading is carried out by a pellet press, pressuretight connected to the drying chamber, and wherein the pelletpress is providng pelletizing of the particulate product after the drying process.
7. Apparatus according to claim 1. wherein the unloading is carried out by a particle pump described in Patent application P. A.200001183.
1 1
SUBSTITUTE SHEET
PCT/DK2002/000825 2001-12-17 2002-12-07 Apparatus for drying a particulate product with superheated steam Ceased WO2003052336A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
AU2002366390A AU2002366390A1 (en) 2001-12-17 2002-12-07 Apparatus for drying a particulate product with superheated steam
BRPI0215005-0A BR0215005B1 (en) 2001-12-17 2002-12-07 apparatus for drying a particulate product with overheated steam.
US10/499,088 US20050155249A1 (en) 2001-12-17 2002-12-07 Apparatus for drying a particulate product with superheated vapour
DK02804853T DK1466131T3 (en) 2001-12-17 2002-12-07 Device for drying a superheated particulate product
DE60217183T DE60217183T2 (en) 2001-12-17 2002-12-07 DEVICE FOR DRYING A PARTICULAR PRODUCT WITH OVERHEATED STEAM
EP02804853A EP1466131B1 (en) 2001-12-17 2002-12-07 Apparatus for drying a particulate product with superheated steam

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200101887 2001-12-17
DKPA200101887 2001-12-17

Publications (1)

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WO2003052336A1 true WO2003052336A1 (en) 2003-06-26

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WO2006024696A1 (en) * 2004-09-03 2006-03-09 Vaelimaeki Heimo A dryer and a method for using and manufacturing thereof
EP2511637A1 (en) 2011-04-15 2012-10-17 Omya Development AG Method for drying wet particulate matter, wherein the dried particulate matter is a white mineral having a brightness Ry of at least 65%, through drying in a direct superheated steam dryer
EP2511636A1 (en) 2011-04-15 2012-10-17 Epcon Evaporation Technology AS Method for energy efficient drying of liquids, slurries, pastes, cakes and moist particles that forms particulate matter through drying in direct superheated steam dryer
EP2480848A4 (en) * 2009-09-22 2014-10-08 Outotec Oyj Drying apparatus and process for drying bulk material and use of said drying apparatus to dry bulk material.
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NO339253B1 (en) * 2013-05-22 2016-11-21 Multivector As A method and system for treating at least one substance to a dried, fragmented, swirled final product
US10260803B2 (en) 2013-05-22 2019-04-16 Waister As Method, a system and devices for processing at least one substance in a dried, fragmented, fluidized end product

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WO1984001207A1 (en) * 1982-09-15 1984-03-29 Erik Gustav Kroneld Method of drying material by indirect heating
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US9863705B2 (en) 2003-03-06 2018-01-09 Vomm Chemipharma S.R.L. Process for drying finely divided organic substances capable of producing explosives reactions
WO2004079282A1 (en) * 2003-03-06 2004-09-16 Vomm Chemipharma S.R.L. A process for drying finely divided organic substances capable of producing explosive reactions
WO2006024696A1 (en) * 2004-09-03 2006-03-09 Vaelimaeki Heimo A dryer and a method for using and manufacturing thereof
EP2480848A4 (en) * 2009-09-22 2014-10-08 Outotec Oyj Drying apparatus and process for drying bulk material and use of said drying apparatus to dry bulk material.
US20140310979A1 (en) * 2011-04-15 2014-10-23 Olav Bergset Method for drying wet particulate matter, wherein the dried particulate matter is a white mineral having a brightness ry of at least 65% that forms particulate matter through drying in direct superheated steam dryer
WO2012140125A1 (en) 2011-04-15 2012-10-18 Epcon Evaporation Technology As Method for energy efficient drying of liquids, slurries, pastes, cakes and moist particles that forms particulate matter through drying in direct superheated steam dryer
CN103534545A (en) * 2011-04-15 2014-01-22 Omya国际股份公司 Method for drying wet particulate matter, wherein the dried particulate matter is a white mineral having a brightness ry of at least 65% that forms particulate matter through drying in direct superheated steam dryer
WO2012140028A1 (en) 2011-04-15 2012-10-18 Omya Development Ag Method for drying wet particulate matter, wherein the dried particulate matter is a white mineral having a brightness ry of at least 65% that forms particulate matter through drying in direct superheated steam dryer
EP2511636A1 (en) 2011-04-15 2012-10-17 Epcon Evaporation Technology AS Method for energy efficient drying of liquids, slurries, pastes, cakes and moist particles that forms particulate matter through drying in direct superheated steam dryer
AU2012241989B2 (en) * 2011-04-15 2015-09-17 Omya International Ag Method for drying wet particulate matter, wherein the dried particulate matter is a white mineral having a brightness Ry of at least 65% that forms particulate matter through drying in direct superheated steam dryer
CN103534545B (en) * 2011-04-15 2016-03-02 Omya国际股份公司 The method of dry wet particulate matter, wherein the particulate matter of drying is the white mineral with at least 65% brightness Ry, and it forms particulate matter via drying in direct superheat steam drying device
EP2511637A1 (en) 2011-04-15 2012-10-17 Omya Development AG Method for drying wet particulate matter, wherein the dried particulate matter is a white mineral having a brightness Ry of at least 65%, through drying in a direct superheated steam dryer
US10190820B2 (en) 2011-04-15 2019-01-29 Omya International Ag Method for drying wet particulate matter, wherein the dried particulate matter is a white mineral having a brightness Ry of at least 65% that forms particulate matter through drying in direct superheated steam dryer
NO339255B1 (en) * 2013-05-22 2016-11-21 Multivector As Apparatus for swirling at least one fragmented substance
NO339254B1 (en) * 2013-05-22 2016-11-21 Multivector As Apparatus for swirling and drying at least one fragmented substance
NO339253B1 (en) * 2013-05-22 2016-11-21 Multivector As A method and system for treating at least one substance to a dried, fragmented, swirled final product
US10260803B2 (en) 2013-05-22 2019-04-16 Waister As Method, a system and devices for processing at least one substance in a dried, fragmented, fluidized end product

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RU2004121971A (en) 2005-04-27
AU2002366390A1 (en) 2003-06-30

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