WO2013011363A1 - Drying device for drying substances suspended or dissolved in a liquid - Google Patents

Drying device for drying substances suspended or dissolved in a liquid Download PDF

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Publication number
WO2013011363A1
WO2013011363A1 PCT/IB2012/001359 IB2012001359W WO2013011363A1 WO 2013011363 A1 WO2013011363 A1 WO 2013011363A1 IB 2012001359 W IB2012001359 W IB 2012001359W WO 2013011363 A1 WO2013011363 A1 WO 2013011363A1
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WO
WIPO (PCT)
Prior art keywords
drying
drying drum
drum
drying device
water
Prior art date
Application number
PCT/IB2012/001359
Other languages
French (fr)
Other versions
WO2013011363A9 (en
Inventor
P. C. Van Beveren
Original Assignee
P.T.I.
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 P.T.I. filed Critical P.T.I.
Publication of WO2013011363A1 publication Critical patent/WO2013011363A1/en
Publication of WO2013011363A9 publication Critical patent/WO2013011363A9/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F26B13/14—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning
    • F26B13/18—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning heated or cooled, e.g. from inside, the material being dried on the outside surface by conduction
    • F26B13/183—Arrangements for heating, cooling, condensate removal
    • F26B13/186—Arrangements for heating, cooling, condensate removal using combustion
    • 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
    • F26B17/28—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rollers or discs with material passing over or between them, e.g. suction drum, sieve, the axis of rotation being in fixed position
    • F26B17/284—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by rollers or discs with material passing over or between them, e.g. suction drum, sieve, the axis of rotation being in fixed position the materials being dried on the non-perforated surface of heated rollers or drums
    • F26B17/286—Arrangements for application of materials to be dried onto the drums or rollers; Arrangements for removing dried materials from the drums or rollers, e.g. doctor blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
    • F26B2200/18—Sludges, e.g. sewage, waste, industrial processes, cooling towers
    • 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
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F26B3/30—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements
    • F26B3/305—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements the infrared radiation being generated by combustion or combustion gases

Definitions

  • Drying device for drying substances suspended or dissolved in a liquid.
  • the present invention relates to a device for drying substances suspended or dissolved in a liquid.
  • the invention is intended for drying aqueous starch-containing preparations in the food industry.
  • starch from vegetable sources such as potatoes, roots or cereal crops is dried by guiding an aqueous starch-containing pulp over the surface of a drying drum that is kept at a high temperature, for example 190 °C, by means of saturated steam at a pressure of 8 to 13 bar.
  • Such devices with a drying drum are already known whereby steam at high pressure is produced in a boiler by means of natural gas combustion for example, from which the steam is guided to a pressure vessel in the form of a drying drum of cast iron or another material.
  • a disadvantage of such a device in which steam pressure is used in the drying drum is that the cast iron pressure vessel requires very thick walls, such that the pressure vessel is heavy and involves a high cost price.
  • a drying drum with 1000 kg/h steam at 13 bar consumes 3250 MJ, whereby this drying drum only delivers 1971 MJ to the drying process.
  • the drying process runs at an energy efficiency of 60%, whereby 40% of the energy supplied is lost.
  • the purpose of the present invention is to provide a solution to the aforementioned and other disadvantages, by providing a drying drum of the type that essentially consists of a drum that can rotate around its longitudinal axis, and which is provided with means to heat up the outside surface of the drum to dry a product that is applied to this outside surface, characterised in that the drum is a hermetically sealable drum that is partly filled with water during use, and which is equipped with a heat source to convert the water into saturated steam, whereby this heat source at least partly consists of an IR radiation source that emits IR radiant heat in the direction of the drying drum.
  • An advantage of such a drying device is that the drum no longer has to be supplied externally with steam under high pressure and thus does not require an external boiler.
  • Another advantage of such a device is that the device can be switched on and off much more quickly than a device equipped with a boiler installation. For example, it is sufficient just to switch off the IR radiation source by switching off its energy source, for example by cutting the electricity supply to the IR radiation source.
  • the IR radiation source consists of one or more ceramic elements that are heated by means of an external energy source, whereby the external energy source preferably consists of at least one combustion chamber for burning natural gas at one end of the drum, and whereby the external energy source preferably not only heats the IR ceramic material to generate IR radiant heat, but at the same time also heats the saturated steam in the drying drum by means of convection heat.
  • An advantage of such a drying device with a drying drum heated by IR radiant heat and by convection heat is that a high final energy efficiency can be obtained.
  • combustion heat from natural gas is converted directly into infrared radiation, and 50% or less as combustion heat.
  • Both energy sources are used to heat the drying drum, in contrast to a drying drum with a separate boiler, where the flue gases from the natural gas are not or barely used as an energy source to heat the drying drum itself.
  • the drying drum consumes 2,469 MJ, whereby this drying drum delivers 2,257 MJ to the drying process.
  • the drying process runs at an energy efficiency of 91%, whereby 9% of the energy supplied is lost, and whereby no energy is required for a pressure pump, but only energy for a fan.
  • drying device with IR radiating ceramic plates and flue gas heating Another advantage of such a drying device with IR radiating ceramic plates and flue gas heating is that external air from the environment can be used to very accurately and directly regulate the final temperature of the drying drum at an optimum temperature for evaporating the solvent, such as water, from the supplied product to be dried.
  • solvent such as water
  • Another advantage of such a device is that the residual heat leaving the device, for example at a temperature of 190 °C, can be used to prepare hot water needed for the production of the aqueous product supplied.
  • drying device Another advantage of such a drying device is that the costs of constructing it are only approximately 70% of those for a traditional device supplied with external steam. Moreover a boiler installation with water preparation unit and condensation treatment is not necessary for the drying.
  • An alternative embodiment of the drying device according to the invention is that the ends of the drying drum are concave instead of convex.
  • co-rotating blades are placed on the concave surface of the ends.
  • An advantage of this alternative embodiment is that the total axial length of the axis of rotation for the same drying surface on the drying drum can be shorter. Another advantage is that one wall of the combustion chambers can form a flat plane, which simplifies its construction .
  • figure 1 schematically shows a cross-section of a drying device according to the state of the art along the longitudinal direction of the drying drum;
  • figure 2 schematically shows a cross-section of a drying device according to the invention along the longitudinal direction of the drying drum;
  • figure 3 shows a cross-section of figure 2 along line III-III perpendicular to the longitudinal direction
  • figure 4 shows a perspective view of a gas-fired heating unit in a drying device according to the invention, built against the drying drum with the omission of the drying drum;
  • figure 5 shows a perspective view of a drying device with a drying drum according to the invention equipped with two gas-fired heating units seen from the outside of the drying device;
  • figure 6 shows a side view of a drying drum equipped with satellite rollers
  • figure 7 shows a cross-section along line VII-VII in figure 6 perpendicular to the longitudinal direction
  • figure 8 shows a cross-section of a drying device according to the invention perpendicular to the longitudinal axis of the drying drum;
  • figure 9 presents an alternative embodiment of figure 1;
  • figure 10 presents a cross-section along line X-X of figure 9.
  • FIG 1 schematically shows a drying device 1 with a drying drum 2 according to the state of the art.
  • a water pump 3 carries water to an external boiler 4 that is heated by a burner 5, which is fired by natural gas for example. Steam is supplied to the drying drum 2 from the external boiler 4.
  • FIG 2 shows a drying device 6 according to the invention, consisting of a holder 7, in which a rotating drying drum 2 can rotate and whereby the rotating drum is flanked at its ends by two static burner arrangements 8,9 that each heat a combustion chamber 10,11.
  • the rotating drying drum 2 contains steam 12 that is in equilibrium with a liquid water phase 13 that is in the drying drum 2 at the bottom.
  • a blade wheel 14a, 14b At each end of the drying drum there is a blade wheel 14a, 14b that co-rotates around the shaft 15 of the drying drum 2, alternately through the gas phase 12 and the liquid phase 13 of the water in the drying drum.
  • Figure 3 shows a side view in more detail of a blade wheel 14b that co-rotates with the drum 2 behind a cover plate 16 and with which the drying drum 2 is equipped at each end.
  • Figure 4 shows a perspective view of one of the burner arrangements 9 with ceramic plates 17 against the combustion chamber wall 18 with the front oriented towards the drying drum, which after heating emits IR radiation to the drying drum 2 and thereby also to the content of the drying drum.
  • the combustion chamber is heated by the combustion of natural gas supplied along a gas supply 21 whereby there is an air supply 19 at the bottom and an exhaust 20 for the flue gases at the top.
  • Figure 5 shows a perspective view of the drying device 6 according to the invention showing the back of the IR radiating plates 17 for one burner arrangement and how these plates are fastened on supports 21.
  • Figure 6 shows a drying device according to the invention equipped with a rotating drying drum 2 that is equipped with a number of satellite rollers 22 that co-rotate with respect to the surface of the drying drum 2, while figure 7 shows how these satellite rollers 22 are positioned in a cross-section perpendicular to the longitudinal direction of the drying drum, whereby the shafts 23 of the satellite rollers 13 are in a fixed position with respect to the shaft 15 of the rotating drum 2.
  • FIG 8 shows a schematic cross-section through the drying device 6, perpendicular to the longitudinal direction of the drying drum 2.
  • the direction of rotation of the drying drum 2 and the satellite rollers 22 is shown by means of arrows.
  • the drying device 6 is provided with a supply 24 for the water-containing product be dried, an extractor 25 above the drying drum, an outlet 26 for surplus residual product and further a receptacle with extractor 27 for the dried end product at the bottom, connected via a conveyor system 28 to a receptacle 29.
  • the receptacle 29 is connected to a conveyor system 30 and is also provided with a cutter 31 that releases the dried material from the drum, which falls down as flakes into the receptacle 29.
  • Figure 9 shows an alternative embodiment of the invention whereby both ends of the drying drum 2 are concave instead of convex, and whereby the combustion chambers 10,11 at each end of the drying drum present a straight wall to the outside.
  • the concave ends on the inside of the drying drum are provided with blades 14a, 14b that co-rotate with the rotating drum.
  • Figure 10 shows a cross-section perpendicular to the longitudinal direction of the drying drum 2, on which the blades 14b on one concave end of the drying drum can be seen.
  • the operation of the drying device 1 is very simple and as follows .
  • the water-containing product to be dried is supplied by a supply 24 and falls onto the surface of the rotating drying drum 2, which is at a temperature of around 190°C. As a result of the heat the water evaporates from the product to be dried and forms a drying cake on the drum 2 that is further pressed by satellite rollers 22 and guided to the residual product outlet 26 where surplus undesired material is removed.
  • the dried material is partly removed under suction 27 and carried via a conveyor mechanism 28 to a receptacle 29 into which the flakes of dried material, released from the surface of the drying drum 2 by a cutter 31, fall before the surface of the drum again approaches the position of the supply 24.
  • the dried material in the receptacle 29 is further carried via a conveyor mechanism 30 for processing or packaging.
  • the rotating drying drum 2 is flanked at both ends by a static burner arrangement 8,9 in which natural gas is burned and whereby the heat released is partly utilised to heat a set of ceramic plates 17 fastened to a support 21 against the combustion chamber wall 18, and partly for heating the content of the rotating drum 2 by means of convection heat.
  • the ceramic plates 17 are brought to a temperature at which they emit heat in the form of IR radiant heat to the content of the rotating drying drum 2.
  • the flue gases produced by the combustion of the natural gas emit heat to the rotating drum 2, but after the exhaust 20 from the combustion chambers they are still hot enough to be able to be further utilised, for example for heating the pulp with solvent-containing substances before being deposited on the surface of the drying drum 2.
  • the energy source used here to heat the ceramic plates 17 up to a temperature at which it emits IR radiant heat does not necessarily have to be natural gas.
  • the IR emitting ceramic material 17 is constructed in a different form to the plates shown as an example, or that the ceramic material is replaced by gas-fired IR emitting heating elements.
  • the drying device 6 can be used for any solvent-containing substances, for example for a pulp of textile or fibres so that the application is not necessarily limited to foodstuffs .
  • the drying device 6 can also be used to dry solvent- containing substances, whereby the solvent is different to water .
  • the drying drum is provided with concave ends instead of convex ends, and the combustion chambers that are in contact with the concave ends on the other side are screened off by a flat circular plate.
  • the concave ends on the inside of the drying drum are provided with co-rotating blades.
  • An advantage of such an embodiment is that for the same width of drying surface on the drum, a shorter axis around which the drum rotates is required.
  • a drying device with a drying drum filled with saturated steam that is at least partly heated by infrared (IR) radiant heat can be realised in all kinds of variants, without departing from the scope of the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Textile Engineering (AREA)
  • Drying Of Solid Materials (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Abstract

Drying device (6) for solvent-containing substances equipped with a drying drum (2) of the type that essentially consists of a drying drum that can rotate around its longitudinal axis (15), and which is provided with means to heat up the outside surface of the drying drum (2) to dry a product that is applied to this outside surface, whereby the drying drum (2) is a hermetically sealable drum that is partly filled with water during use, and which is equipped with a heat source to convert the water (13) into saturated steam (12), whereby this heat source at least partly consists of an IR radiation source (17) that emits IR radiant heat in the direction of the drying drum (2) to the water and steam present.

Description

Drying device for drying substances suspended or dissolved in a liquid.
The present invention relates to a device for drying substances suspended or dissolved in a liquid.
More specifically, the invention is intended for drying aqueous starch-containing preparations in the food industry.
Traditionally starch from vegetable sources such as potatoes, roots or cereal crops is dried by guiding an aqueous starch-containing pulp over the surface of a drying drum that is kept at a high temperature, for example 190 °C, by means of saturated steam at a pressure of 8 to 13 bar.
Such devices with a drying drum are already known whereby steam at high pressure is produced in a boiler by means of natural gas combustion for example, from which the steam is guided to a pressure vessel in the form of a drying drum of cast iron or another material.
A disadvantage of such a device in which steam pressure is used in the drying drum is that the cast iron pressure vessel requires very thick walls, such that the pressure vessel is heavy and involves a high cost price.
Another disadvantage of such a device with steam under high pressure supplied to a drying drum is that such a device is not very flexible to use, because such an installation cannot be quickly started up and cannot be switched off quickly either.
Another disadvantage of such a device is that the final energy efficiency is not very high.
For example, a drying drum with 1000 kg/h steam at 13 bar consumes 3250 MJ, whereby this drying drum only delivers 1971 MJ to the drying process. In other words the drying process runs at an energy efficiency of 60%, whereby 40% of the energy supplied is lost.
The purpose of the present invention is to provide a solution to the aforementioned and other disadvantages, by providing a drying drum of the type that essentially consists of a drum that can rotate around its longitudinal axis, and which is provided with means to heat up the outside surface of the drum to dry a product that is applied to this outside surface, characterised in that the drum is a hermetically sealable drum that is partly filled with water during use, and which is equipped with a heat source to convert the water into saturated steam, whereby this heat source at least partly consists of an IR radiation source that emits IR radiant heat in the direction of the drying drum.
An advantage of such a drying device is that the drum no longer has to be supplied externally with steam under high pressure and thus does not require an external boiler. Another advantage of such a device is that the device can be switched on and off much more quickly than a device equipped with a boiler installation. For example, it is sufficient just to switch off the IR radiation source by switching off its energy source, for example by cutting the electricity supply to the IR radiation source.
Preferably the IR radiation source consists of one or more ceramic elements that are heated by means of an external energy source, whereby the external energy source preferably consists of at least one combustion chamber for burning natural gas at one end of the drum, and whereby the external energy source preferably not only heats the IR ceramic material to generate IR radiant heat, but at the same time also heats the saturated steam in the drying drum by means of convection heat.
An advantage of such a drying device with a drying drum heated by IR radiant heat and by convection heat is that a high final energy efficiency can be obtained.
Indeed, 50% or more of the combustion heat from natural gas is converted directly into infrared radiation, and 50% or less as combustion heat. Both energy sources are used to heat the drying drum, in contrast to a drying drum with a separate boiler, where the flue gases from the natural gas are not or barely used as an energy source to heat the drying drum itself.
With 1000 kg/h steam at 1 bar, the drying drum consumes 2,469 MJ, whereby this drying drum delivers 2,257 MJ to the drying process. In other words the drying process runs at an energy efficiency of 91%, whereby 9% of the energy supplied is lost, and whereby no energy is required for a pressure pump, but only energy for a fan.
Another advantage of such a drying device with IR radiating ceramic plates and flue gas heating is that external air from the environment can be used to very accurately and directly regulate the final temperature of the drying drum at an optimum temperature for evaporating the solvent, such as water, from the supplied product to be dried.
Another advantage of such a device is that the residual heat leaving the device, for example at a temperature of 190 °C, can be used to prepare hot water needed for the production of the aqueous product supplied.
Another advantage of such a drying device is that the costs of constructing it are only approximately 70% of those for a traditional device supplied with external steam. Moreover a boiler installation with water preparation unit and condensation treatment is not necessary for the drying.
An alternative embodiment of the drying device according to the invention is that the ends of the drying drum are concave instead of convex. In this embodiment co-rotating blades are placed on the concave surface of the ends.
An advantage of this alternative embodiment is that the total axial length of the axis of rotation for the same drying surface on the drying drum can be shorter. Another advantage is that one wall of the combustion chambers can form a flat plane, which simplifies its construction .
With the intention of better showing the characteristics of the invention, a preferred embodiment of a device for drying solvent-containing substances according to the invention is described hereinafter by way of an example, without any limiting nature, with reference to the accompanying drawings, wherein: figure 1 schematically shows a cross-section of a drying device according to the state of the art along the longitudinal direction of the drying drum;
figure 2 schematically shows a cross-section of a drying device according to the invention along the longitudinal direction of the drying drum;
figure 3 shows a cross-section of figure 2 along line III-III perpendicular to the longitudinal direction; figure 4 shows a perspective view of a gas-fired heating unit in a drying device according to the invention, built against the drying drum with the omission of the drying drum;
figure 5 shows a perspective view of a drying device with a drying drum according to the invention equipped with two gas-fired heating units seen from the outside of the drying device;
figure 6 shows a side view of a drying drum equipped with satellite rollers; figure 7 shows a cross-section along line VII-VII in figure 6 perpendicular to the longitudinal direction; figure 8 shows a cross-section of a drying device according to the invention perpendicular to the longitudinal axis of the drying drum;
figure 9 presents an alternative embodiment of figure 1;
figure 10 presents a cross-section along line X-X of figure 9.
Figure 1 schematically shows a drying device 1 with a drying drum 2 according to the state of the art. A water pump 3 carries water to an external boiler 4 that is heated by a burner 5, which is fired by natural gas for example. Steam is supplied to the drying drum 2 from the external boiler 4.
Figure 2 shows a drying device 6 according to the invention, consisting of a holder 7, in which a rotating drying drum 2 can rotate and whereby the rotating drum is flanked at its ends by two static burner arrangements 8,9 that each heat a combustion chamber 10,11. The rotating drying drum 2 contains steam 12 that is in equilibrium with a liquid water phase 13 that is in the drying drum 2 at the bottom. At each end of the drying drum there is a blade wheel 14a, 14b that co-rotates around the shaft 15 of the drying drum 2, alternately through the gas phase 12 and the liquid phase 13 of the water in the drying drum. Figure 3 shows a side view in more detail of a blade wheel 14b that co-rotates with the drum 2 behind a cover plate 16 and with which the drying drum 2 is equipped at each end.
Figure 4 shows a perspective view of one of the burner arrangements 9 with ceramic plates 17 against the combustion chamber wall 18 with the front oriented towards the drying drum, which after heating emits IR radiation to the drying drum 2 and thereby also to the content of the drying drum. The combustion chamber is heated by the combustion of natural gas supplied along a gas supply 21 whereby there is an air supply 19 at the bottom and an exhaust 20 for the flue gases at the top.
Figure 5 shows a perspective view of the drying device 6 according to the invention showing the back of the IR radiating plates 17 for one burner arrangement and how these plates are fastened on supports 21.
Figure 6 shows a drying device according to the invention equipped with a rotating drying drum 2 that is equipped with a number of satellite rollers 22 that co-rotate with respect to the surface of the drying drum 2, while figure 7 shows how these satellite rollers 22 are positioned in a cross-section perpendicular to the longitudinal direction of the drying drum, whereby the shafts 23 of the satellite rollers 13 are in a fixed position with respect to the shaft 15 of the rotating drum 2.
Figure 8 shows a schematic cross-section through the drying device 6, perpendicular to the longitudinal direction of the drying drum 2. The direction of rotation of the drying drum 2 and the satellite rollers 22 is shown by means of arrows. The drying device 6 is provided with a supply 24 for the water-containing product be dried, an extractor 25 above the drying drum, an outlet 26 for surplus residual product and further a receptacle with extractor 27 for the dried end product at the bottom, connected via a conveyor system 28 to a receptacle 29. The receptacle 29 is connected to a conveyor system 30 and is also provided with a cutter 31 that releases the dried material from the drum, which falls down as flakes into the receptacle 29.
Figure 9 shows an alternative embodiment of the invention whereby both ends of the drying drum 2 are concave instead of convex, and whereby the combustion chambers 10,11 at each end of the drying drum present a straight wall to the outside. The concave ends on the inside of the drying drum are provided with blades 14a, 14b that co-rotate with the rotating drum.
Figure 10 shows a cross-section perpendicular to the longitudinal direction of the drying drum 2, on which the blades 14b on one concave end of the drying drum can be seen.
The operation of the drying device 1 is very simple and as follows .
The water-containing product to be dried is supplied by a supply 24 and falls onto the surface of the rotating drying drum 2, which is at a temperature of around 190°C. As a result of the heat the water evaporates from the product to be dried and forms a drying cake on the drum 2 that is further pressed by satellite rollers 22 and guided to the residual product outlet 26 where surplus undesired material is removed.
When the surface of the drying drum 2 reaches its lowest position underneath, the dried material is partly removed under suction 27 and carried via a conveyor mechanism 28 to a receptacle 29 into which the flakes of dried material, released from the surface of the drying drum 2 by a cutter 31, fall before the surface of the drum again approaches the position of the supply 24.
The dried material in the receptacle 29 is further carried via a conveyor mechanism 30 for processing or packaging.
The rotating drying drum 2 is flanked at both ends by a static burner arrangement 8,9 in which natural gas is burned and whereby the heat released is partly utilised to heat a set of ceramic plates 17 fastened to a support 21 against the combustion chamber wall 18, and partly for heating the content of the rotating drum 2 by means of convection heat.
The ceramic plates 17 are brought to a temperature at which they emit heat in the form of IR radiant heat to the content of the rotating drying drum 2.
In the drying drum 2 there is water 13 in equilibrium with saturated steam 12 at a temperature of around 190 °C and a pressure of 5 bar. At the level of the ends of the rotating drying drum there are blade wheels 14a, 14b that ensure a good supply of water from the water phase 13 at the bottom to the heated side walls of the rotating drying drum where this water is converted into steam.
The flue gases produced by the combustion of the natural gas emit heat to the rotating drum 2, but after the exhaust 20 from the combustion chambers they are still hot enough to be able to be further utilised, for example for heating the pulp with solvent-containing substances before being deposited on the surface of the drying drum 2.
It goes without saying that the energy source used here to heat the ceramic plates 17 up to a temperature at which it emits IR radiant heat does not necessarily have to be natural gas.
It is thus conceivable that the ceramic plates 17 are heated electrically, and that the water in the drying drum 2 is also heated electrically.
It is also conceivable that the IR emitting ceramic material 17 is constructed in a different form to the plates shown as an example, or that the ceramic material is replaced by gas-fired IR emitting heating elements.
The drying device 6 can be used for any solvent-containing substances, for example for a pulp of textile or fibres so that the application is not necessarily limited to foodstuffs .
The drying device 6 can also be used to dry solvent- containing substances, whereby the solvent is different to water .
In an alternative embodiment of the invention, the drying drum is provided with concave ends instead of convex ends, and the combustion chambers that are in contact with the concave ends on the other side are screened off by a flat circular plate. The concave ends on the inside of the drying drum are provided with co-rotating blades.
An advantage of such an embodiment is that for the same width of drying surface on the drum, a shorter axis around which the drum rotates is required.
The present invention is by no means limited to the embodiments described as an example and shown in the drawings, but a drying device with a drying drum filled with saturated steam that is at least partly heated by infrared (IR) radiant heat according to the invention can be realised in all kinds of variants, without departing from the scope of the invention.

Claims

Claims
1. - Drying device (6) for solvent-containing substances equipped with a drying drum (2) of the type that essentially consists of a drying drum that can rotate around its longitudinal axis (15), and which is provided with means to heat up the outside surface of the drying drum (2) to dry a product that is applied to this outside surface, characterised in that the drying drum (2) is a hermetically sealable drum that is partly filled with water during use, and which is equipped with a heat source to convert the water (12) into saturated steam (13) , whereby this heat source at least partly consists of an IR radiation source (17) that emits IR radiant heat in the direction of the drying drum to the water and steam present .
2. - Drying device (6) according to claim 1, characterised in that the IR radiation source (17) consists of one or more ceramic elements that are heated by means of an external energy source.
3. - Drying device (6) according to claim 2, characterised in that the external energy source consists of at least one combustion chamber (8,9) for burning natural gas at one end of the drying drum (2) .
4. - Drying device (6) according to claim 3, characterised in that the external energy source not only heats the IR ceramic material (17) to generate IR radiant heat, but at the same time also heats the saturated steam and the water (12) in the drying drum (2) by means of convection heat.
5. - Drying device (6) according to any one of the previous claims, characterised in that the solvent in the solvent- containing substances is water.
6. - Drying device (6) according to any one of the previous claims, characterised in that the solvent-containing substances consist of an aqueous starch pulp.
7. - Drying device (6) according to any one of the previous claims, characterised in that the drying drum (2) is equipped with one or more satellite rollers (22) that press the drying material on the surface of the drying drum (2) .
8. - Drying device (6) according to any one of the previous claims, characterised in that the drying drum (2) is equipped with a cutter (31) that releases the dried substances from the surface of the drying drum (2) .
9. - Drying device (6) according to any one of the previous claims, characterised in that the drying drum (2) is provided with concave ends, which on the inside of the drying drum are provided with co-rotating blades.
PCT/IB2012/001359 2011-07-20 2012-07-11 Drying device for drying substances suspended or dissolved in a liquid WO2013011363A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE2011/0470 2011-07-20
BE2011/0470A BE1020125A3 (en) 2011-07-20 2011-07-20 DRYING DEVICE FOR DRYING SUBSTANCES SUSPENDED OR SOLVED IN A LIQUID.

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WO2013011363A1 true WO2013011363A1 (en) 2013-01-24
WO2013011363A9 WO2013011363A9 (en) 2013-05-10

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PCT/IB2012/001359 WO2013011363A1 (en) 2011-07-20 2012-07-11 Drying device for drying substances suspended or dissolved in a liquid

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1580164A (en) * 1922-01-28 1926-04-13 George J Pezold Drying apparatus
GB658835A (en) * 1948-09-08 1951-10-17 Stieger Helmut John Improvements in or relating to the concentration and evaporation of liquids
GB682675A (en) * 1949-08-16 1952-11-12 Kestner Evaporator & Engineeri A method of and means for solidifying films of liquid materials
FR2095892A5 (en) * 1970-06-04 1972-02-11 Monforts Fabric treatment roller - with double walls and internal burner - to give steam heating of outer shell
NL1028926C1 (en) * 2005-04-29 2006-11-01 Tummers Beheer B V Scraper blade for cleaning e.g. dryer cylinder for foodstuffs, contains grooves to compensate for temperature differences

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1580164A (en) * 1922-01-28 1926-04-13 George J Pezold Drying apparatus
GB658835A (en) * 1948-09-08 1951-10-17 Stieger Helmut John Improvements in or relating to the concentration and evaporation of liquids
GB682675A (en) * 1949-08-16 1952-11-12 Kestner Evaporator & Engineeri A method of and means for solidifying films of liquid materials
FR2095892A5 (en) * 1970-06-04 1972-02-11 Monforts Fabric treatment roller - with double walls and internal burner - to give steam heating of outer shell
NL1028926C1 (en) * 2005-04-29 2006-11-01 Tummers Beheer B V Scraper blade for cleaning e.g. dryer cylinder for foodstuffs, contains grooves to compensate for temperature differences

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