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EP2395306A2 - Procédé et dispositif de séchage de fibres, notamment de copeaux de bois - Google Patents

Procédé et dispositif de séchage de fibres, notamment de copeaux de bois Download PDF

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Publication number
EP2395306A2
EP2395306A2 EP11168807A EP11168807A EP2395306A2 EP 2395306 A2 EP2395306 A2 EP 2395306A2 EP 11168807 A EP11168807 A EP 11168807A EP 11168807 A EP11168807 A EP 11168807A EP 2395306 A2 EP2395306 A2 EP 2395306A2
Authority
EP
European Patent Office
Prior art keywords
container
gas
fiber material
drying
bed
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.)
Withdrawn
Application number
EP11168807A
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German (de)
English (en)
Other versions
EP2395306A3 (fr
Inventor
Heinrich Hörmeyer
Konrad Stolzenberg
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.)
PIECO GmbH
Original Assignee
PIECO GmbH
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 PIECO GmbH filed Critical PIECO GmbH
Publication of EP2395306A2 publication Critical patent/EP2395306A2/fr
Publication of EP2395306A3 publication Critical patent/EP2395306A3/fr
Withdrawn legal-status Critical Current

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    • 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
    • F26B17/12—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft
    • F26B17/122—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the material moving through a cross-flow of drying gas; the drying enclosure, e.g. shaft, consisting of substantially vertical, perforated walls
    • F26B17/126—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the material moving through a cross-flow of drying gas; the drying enclosure, e.g. shaft, consisting of substantially vertical, perforated walls the vertical walls consisting of baffles, e.g. in louvre-arrangement
    • 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
    • F26B2200/24—Wood particles, e.g. shavings, cuttings, saw dust
    • 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
    • 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
    • F26B3/14—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 materials or objects to be dried being moved by gravity

Definitions

  • the invention relates to a process for drying fiber material, in which the fiber material to be dried is filled into a container of a dryer and a drying gas is passed through the fiber material
  • dead biomass is often dried before incineration. Drying is required in particular if heartwood is not burned by logs, but branches, sapwood and similar substances whose moisture content can exceed 50%. This material is usually crushed into woodchips and often stored directly at the point of origin for a few months to dry out. Nevertheless, no low final moisture is achieved. Substance losses through microbiological decomposition processes also occur. The spreading molds are also a health burden for anyone who deals with the dried wood. Frequently, drying on site is not possible because the corresponding storage space is missing.
  • the biomass consists of wood shavings, wood chips, fermentation residues from biogas plants, paper sludge, sewage sludge, industrial waste of mineral or organic origin or other sludge-like masses.
  • the device has a drying container, which has in the region of its bottom a peripheral scraper conveyor to circulate the biomass continuously or at intervals from bottom to top and to mix. In particular, this should be interrupted in the biomass forming air ducts.
  • the drying takes place by means of a supply of heated air, which is fed to the drying container above the biomass and through the bottom of the drying container.
  • the moisture-laden air is withdrawn from the drying tank and used to preheat the drying air.
  • the dried biomass is removed after switching off the drying air supply via a discharge from the drying tank.
  • Two drying containers connected in series can be provided for pre-drying and final drying.
  • the drying plant consists essentially of a drying room in which a plurality of longitudinal conveyor are arranged in such a way that the stalk and sheet material to be dried can be conveyed circumferentially.
  • a first longitudinal conveyor is arranged, which is flowed through from below with cold or warm dry air.
  • a second vertical longitudinal conveyor is arranged, which conveys the stalk and sheet material in the area of the ceiling of the drying room and delivers to a third longitudinal conveyor.
  • the conveying direction of the third longitudinal conveyor is opposite to the conveying direction of the first longitudinal conveyor.
  • the stalk and leaf material can be removed or returned to the first longitudinal conveyor.
  • Method and device for drying comminuted wood, in particular wood chips and wood fibers The wood to be dried is here dried in cocurrent in a dryer not described in detail.
  • a cleaning system is provided with one or more scrubbers.
  • the present invention is based on the object of providing a drying method for fibrous material and a dryer for fibrous material with simple system technology.
  • a simplified process for drying fiber material in which the fibrous material to be dried is filled into a container of a dryer and a drying gas is passed through the fiber material, provided by the fact that the fibrous material to be dried from above into the container in the form of Bedding is introduced, the dry gas is introduced into an upper portion of the bed of fibrous material, the dry gas flows down through the bed of fibrous material and as a laden with moisture from the fiber material moist gas from a lower portion of the bed, which is below the upper portion of the Bulk of fibrous material is derived.
  • Such a drying process is useful not only for dead biomass but for many types of solids which have a fibrous structure called fibrous matter.
  • fibrous matter As an example, textiles are called.
  • fibrous material is also intended to include solids which are not exclusively fibers.
  • Fiber-like dead biomass such as wood chips, wood chips, straw or biowaste is preferably used as fiber material.
  • the fiber has fiber lengths of 1 to 20cm.
  • the moist gas is discharged from the container through one or more permeable walls.
  • the fibrous material to be dried during the drying process is continuously supplied to the container from above, the dried fiber is continuously withdrawn from the container during the drying process and the bed of the fiber during the drying process in the manner of a moving bed from top to bottom migrates in the container.
  • coarser fiber material can be enforced. This reduces the dust formation and the pre-shredding effort, which can be very high, in particular for the moist fiber material. It also allows a low pressure loss and thus low energy costs for gas production.
  • the fiber material travels along installation elements arranged in the container and the moist gas is discharged through the installation elements.
  • the fiber material supplied to the container is distributed by means of a distributor over the cross section of the container.
  • the dust content in the discharged moist gas is measured when the measured dust content exceeds a predetermined value, the supply of drying gas is reduced or interrupted, from below from the container not yet dried fiber, which does not yet have the required residual moisture has reached, withdrawn and stored, then subsequent dried fiber material with the required low residual moisture removed and stored separately and the previously emptied not yet dried fiber is refilled at the top of the container.
  • At least the last flowed through part of the fiber material can be wetted with a dust-binding substance. It can also be provided that at least the last flowed through part of the fiber material has a moist surface.
  • the dedusting of the moist gas can also be done in a separate bed, so that the moist gas after a first drying step then flows through a second bed of wet or wetted with a dust fiber material and the dust-enriched fiber from the second bed of the first drying stage is supplied.
  • an additional stream of dry gas can be introduced below the dry gas introduced in the upper region of the bed and the final moisture of the fibrous material can be regulated by means of its dew point distance and amount.
  • a simplified dryer for drying fiber material with an arranged in the upper region of a container of the dryer inlet for a drying gas, with a arranged in the upper region of the container connection for drying fiber material, with a arranged in the lower region of the container hood for a dried fiber, with one at the bottom of the container arranged outlet for a moist gas, achieved in that during the drying process, the fiber material migrates in the manner of a moving bed in a traveling direction from top to bottom through the container.
  • This dryer is particularly suitable for carrying out the method described above.
  • At least one installation element is arranged in the container, in the installation element at least one outlet opening for the moist gas is arranged and seen in the direction of travel, the installation element is designed such that the cross section of the container for the migration of the fiber material is constant or expanding , This ensures that the fiber material does not accumulate on the way through the container. In particular, this is suitable for coarser fiber, which tends to snag one another.
  • the mounting element projects beyond the bed of fiber material upwards and in a lower region of the mounting element a plurality of outlet openings for the moist gas are arranged. Thus, the mounting element extends over the entire path of the fiber material except the Ausschleus Kunststoffes.
  • the at least one mounting element is a vertical wall
  • the mounting element is hollow and has an inner space and the at least one mounting element closes on a wall of the container and is suspended there.
  • the FIG. 1 shows a schematic diagram of a structure of a dryer according to the invention 1.
  • the dryer 1 consists essentially of a cylindrical Container 2 with a circumferential wall 2a, a bottom adjoining thereto 2b and with a top of the wall 2a subsequent cover 2c.
  • the container 2 is fed with wet fiber material 3 via a tubular connection 4 arranged in the lid 2c.
  • a rotary valve 5 is arranged in the connection 4.
  • a pneumatic conveying can be provided. After passing through the rotary valve 5, the fiber material 3 falls from the connection 4 into the container 2.
  • the fiber material strikes a distribution device 6 whose task is to distribute the fiber material 3 uniformly over the cross section of the container 2.
  • This distribution device 6 essentially consists of a horizontally oriented arm 6a, which is suspended on the cover 2c so as to rotate about a vertical axis 6b.
  • the axis 6b is arranged centrally in the lid 2c and the arm 6a has almost a length corresponding to the diameter of the container 2.
  • downwardly extending distributor blades 6c are arranged on the arm 6a, via which the fiber material 3 is distributed upon corresponding rotation of the arm 6a.
  • the distributor 6 thus limits the bed 7 from the fiber material 3 upwards and is arranged at a small distance from the cover 6c.
  • the mechanical distribution devices 6 are over-dimensioned in their delivery rate compared to the incoming amount of fiber material 3, so that they can evenly distribute the fiber material 3.
  • the level of the container 2 is controlled by a level measurement.
  • a cylindrical container 2 it is favorable to introduce the fiber material 3 as centrally as possible and to distribute it with the distribution device 6 with the employed distribution blades 6c such that the fiber material 3 is conveyed more strongly in the direction of rotation of the arm 6a of the distribution device 6 than radially outward.
  • a hot drying gas 8 simultaneously flows into the container 2 from above via a tubular inlet 9 arranged in the lid 2c.
  • the drying gas 8 strikes the bed 7 of fiber material 3 and flows through it in the direction of the bottom 2b of the container second
  • mounting elements 10 are arranged, which extend from the bottom 2b of the container 2 in the direction of the lid 2c.
  • the mounting elements 10 are vertically installed and extend parallel to each other and up to the walls 2a of the container 2.
  • These mounting elements 10 may be as inner walls with a rectangular base with or without rounded corners or as a pillar with a rectangular, triangular or round base with or without rounded corners be educated.
  • the mounting elements 10 are formed as a hollow body with an interior 10 a. Here, the mounting elements 10 are not placed on the floor 2b and fixed there, but are suspended laterally on the walls 2a.
  • FIG. 1 illustrated embodiment of the mounting elements 10 as partitions extend three mutually parallel and spaced mounting elements 10 between the wall 2a of the container 2.
  • the mounting elements 10 are secured with their opposite sides respectively on the inside of the wall 2a of the container 3. Also, the mounting elements 10 to reach below the distributor 6, so that a narrowing of the free cross section for the fibers and their compression is avoided below the distribution. If the mounting elements 10 are formed as pillars or shorter and thus not reaching from wall 2a to wall 2a of the container 2, attached to the wall 2a cross members are attached. The mounting elements 10 are thus suspended in the container 2, so that above the mounting elements 10 sufficient space for the distributor 6 and below the mounting elements 10 sufficient space for a discharge device 11 remains.
  • This discharge device 11 is preferably designed as a silo discharge screw and has the task to discharge the dried fiber 14 from the container 2 through a trigger 15.
  • the silo discharge screw is pivotally mounted on the bottom 2b via a central axis. This allows Siloaustragsschnecke turn in addition to the rotation of their screws above the bottom 2b of the container 2 and has conveyed after a rotation of 360 °, the entire cross-section of the bottom 2b in the exhaust pipe 15.
  • a second rotary valve 16 is arranged in the trigger 15.
  • the fibrous material 3 to be dried is thus moved as a moving bed from top to bottom through container 2, wherein the drying gas 8 in the DC to the
  • These built-in elements 10 have the function of draining the moisture laden dry gas 8, which is referred to as wet gas 12, from the container 2.
  • the mounting elements 10 are provided with a plurality of sieve-like arranged outlet openings 10b in their walls. Through the outlet openings 10b, the moist gas 12 enters the interior 10a of the respective mounting element 10 and from there into an outlet 13 and through the wall 2a of the container 2 to the outside.
  • the outlet openings 10b are advantageously installed in a vertical wall 10c of the mounting elements 10. By this orientation, the outlet openings 10b are protected against blockages and also a discharge of fiber material 3 or its particles through the outlet openings 10b is minimized.
  • the mounting elements 10 do not narrow the cross-section of the container 2. This is achieved by extending the mounting elements 10 starting from the gas-permeable wall 10c in the direction of the distributor 6. In this case, the wall 10d adjoining the gas-permeable wall 10c is then made gas-impermeable. As a result, the container 2 in the region of the mounting elements 10 and thus the gas-permeable wall 10c and the gas-impermeable wall 10d has a constant cross-section. The conveying of the fiber material 3 is favored.
  • the diameter of the outlet openings 10b does not exceed the size of 4 mm. Clogging of the outlet openings 10b and the formation of deposits on the gas-permeable walls 10c is minimized in vertical or downwardly tapered mounting elements 10.
  • the downwardly moving fiber material 3 exerts a sweeping effect on the outlet openings 10b.
  • the mounting elements 10 are open at the bottom, what they for deposits in the interior 10a makes it unsusceptible.
  • the upper part with the gas-impermeable wall 10d from the lower part with the gas-permeable wall 10c can be separated gas-tight.
  • the formerly gas-impermeable wall 10d could also be provided with outlet openings 10b and all or part of the supply of the drying gas from there happen.
  • outlet openings 10b in the upper and lower part of the walls 10c, 10d are advantageously not provided in a common wall in order to avoid short-circuit flows of the drying gas.
  • the packed bed of wet fiber 3 or dry fiber 14 can be divided into a first zone a, a second zone b and a third zone c.
  • the first zone a which may also be referred to as the upper region of the bed 7 of fiber material 3, extends from the upper end of the bed 7 near the distributor 6 down to the area of the vertical installation elements 10 in which the gas-impermeable wall 10d ends ,
  • the fiber material 3 is dried by the drying gas 8 flowing through from above.
  • the drying gas 8 cools down almost to its dew point and absorbs moisture from the fiber material 3.
  • the introduction of heat by means of the drying gas 8 from above ensured because of the thermal effect over the cross section of the container approximately the same temperatures in the container 2 with hotter gas above and colder gas below. A break of strands of hot dry gas 8 down is not expected lower because of its colder gas lower density below.
  • the residence time of the fiber material 3 in the first zone a is determined by the nature of the fibers to be dried and the desired final moisture content. Often a low final moisture content is desired and the fiber material 3 should be dried to a minimum core moisture. Then heat transfer and mass transfer inside the fiber material determine the drying time. Fine fibers need much less Residence time as coarse fibers. If the solid is continuously passed through the container 2 in a traveling layer, the required height of the first zone a can be calculated from the residence time by means of material and enthalpy balances for the fiber material 3 and for the flow of the drying gas 3.
  • the first zone a is adjoined by the second zone b, which extends as far as the lower edge of the installation elements 10 and thus is located in the region of the gas-permeable wall 10c of the installation elements 10.
  • the second zone b can also be referred to as the lower region of the bed of fibrous material 3.
  • the moisture laden dry gas 8 flows through the outlet openings 10b into the interior 10a of the installation elements 10.
  • This discharge of the moist gas 12 occurs in the second zone b and at least in the lower part of the first zone a in addition to the vertical Flow of the drying gas 8 to a horizontal flow rate, which increases the pressure loss and can affect a uniform drying.
  • the height of the first zone a is to be selected larger than half the horizontal distance between the gas-permeable walls 10c. In accordance with any requirements for the uniformity of drying, the distance between the gas-permeable walls 10c of the opposite internals 10 is further reduced.
  • drying in the second zone b can be continued. Often, however, one will want to minimize the heat losses and allow in the second zone b only a homogenization of the drying.
  • the second zone b is adjoined at the bottom by the third zone c, which thus begins at the lower edge of the mounting elements 10 and extends to the bottom 2b.
  • the dried fiber material 14 is removed by means of the discharge device 11, so that the bulk layer migrates downwards overall and space is created for new wet fiber material 3 at the top.
  • the flow rate of the drying gas 8 in the packed bed of fibrous material 3 is limited by the build-up of pressure loss. Practically, for example, woodchip chips with a length up to 5 centimeters below Economics aspects can reach a superficial velocity of up to 1 m / s.
  • the flow rate of the drying gas 8 at the exit from the second zone b through the gas-permeable walls 10c is kept low. Based on the total area of the gas permeable walls 10c, the flow rate of the drying gas 8 will not be higher than the vertical empty tube flow rate. From the deduced volume of the drying gas, its flow velocity and the area of the gas-permeable walls relative to the container volume, the height of the second zone b results.
  • the gas-permeable walls 10c may contain large discharge openings 10b and the flow rate may be so high that fine grain of the fiber material 3 is not being fluidized. Accordingly, the height of the second zone b can be minimized.
  • the gas-permeable wall 10c consists of downwardly open channels, into which the moist gas 12 enters from the bed of the fiber material 3, in which it rises and is discharged from the container 2.
  • the dust emissions in the withdrawn moist gas 12 of the dryer 1 depend on various parameters. This includes the fine grain content of the fiber material 3, for example, in wood its content of sawdust. Hardly a material will be practical find, which has no fines that can form dust. In addition, the dust emissions are influenced by the process conditions.
  • the dust is formed by the drying fiber 14, it is advantageous to provide in the area of the discharge of moist gas 12 moist wet fiber 14, which can act as a dust binder. This can be exploited in operations of the dryer 1, in which constantly moist fiber material 3 is maintained in the second zone b, since only a small dehumidification is required.
  • FIG. 2 shows a plan view of a dryer 1 according to FIG. 1 , It can be seen particularly clearly that three mounting elements 10 are provided. One of these is arranged in the middle of the container 2 and the two remaining right and left thereof with a corresponding distance. The three mounting elements 10 thus divide the container 10 into four areas for the fiber material 4. The mounting elements 10 are each attached with their lateral ends to the inside of the wall 2a of the container and close tight and flush with this.
  • FIG. 3 is a process diagram with a dryer 1 downstream dedusting 17 shown.
  • the dryer 1 corresponds to the FIGS. 1 and 2 described construction and is in the FIG. 3 but only symbolically represented.
  • the dust collector 17 consists of a cylindrical dust collector container 18, which is charged with wet fiber material 3 from above. With regard to the exact configuration of the dust collector container 18, reference is made to the description of the container 2 of the dryer 1.
  • the deduster 17 also has a connection for the fiber material 3, a first rotary valve, a distributor, deduster discharge device 19, an outlet for the dedusted moist gas 20 and a trigger and a second rotary valve for the pre-dried fiber 21.
  • the deduster Container 18 are filled with a bed of wet fiber 3, which moves from top to bottom in the direction of a bottom 18 b.
  • the moist gas 12 originating from the drier 1 is supplied to the dust collector container 18 in the region of a cover 18c or an upper portion of a wall 18a, so that it flows in cocurrent with the moving bed of fibrous material 3 in the direction of the bottom 18b.
  • the moist gas 12 is dedusted, since the dust particles attach to the surface wet fiber material 3.
  • This downstream deduster 17 can be operated continuously in relation to the supply and the deduction of fiber material 3. It is also possible a discontinuous mode of operation or exchanged at the onset of dust or excessively high pressure and optionally fed into the first drying room.
  • the pre-dried but still wet and dust laden with fiber 21 from the dust collector 17 via a fiber material line 23rd continuously conveyed into the container 2.
  • dry gas 8 is introduced from above and passed from top to bottom through the pre-dried fiber 21.
  • the drying gas 8 is cooled by absorbing moisture from the fiber 21 and through the permeable and vertical wall 10c of the mounting elements 10 in the region of the outlet openings 10b from the container 2 as wet gas 12 via a moist gas line 24 in the next dedusting container 18 of the deduster 17 headed.
  • the surface wet fibers 3 are conveyed into the container 18 and serve for dust filtration and residual heat utilization of the moist gas 12. From there, they are emptied with the deduster 19 discharge and transported as pre-dried fiber 21 in the container 2. After drying in the container 2, the dried fiber 14 is emptied by means of the discharge device 11.
  • the container 2 and the dedusting container 18 are continuously flowed through with the gases 1 and then 12.
  • the fiber material 3 can be conveyed continuously or discontinuously. Either the entire amount can be promoted by the deduster 17 or only a part, so that the rest of the fiber material 3 is fed directly to the container 2. Preferably, the majority of the fiber material 3 is fed directly to the container 2.
  • the dryer 1 and the deduster 17 can also be combined to form an apparatus in which the dust collector container 18 of the deduster 17 is placed on the container 2 of the dryer 1. As a result, the leadership of the fiber material 3 is facilitated.
  • the adsorption properties of the fibers of the fiber material 3 for dust can be improved by additives. This may relate to the entire amount of fiber material 3 or only the fibers of the fiber material 3, which dedust the wet gas 12 in a downstream packed layer in the dust collector 17. For example, molasses can be added. Also, the fibers of the fiber material 3 can be misted with oil or Sufitablauge.
  • the fiber bulk layers of fiber material 3 can also be used to dedust the drying gas 8, for example, flue gas from wood firing.
  • the desired final moisture content of the fiber material 3 can also be adjusted by preferably in the upper region of the bed of the fiber material 3, i. in the first zone a, the moisture is continuously measured and, accordingly, the supply of fiber 3 or dry gas 8 is controlled.
  • the removal amount of the dried fiber material 14 can be controlled via a level measurement of the bed of the fiber material 3.
  • the drying gas 8 hot air can be used, which is introduced at least 20 ° C below the autoignition temperature of the fiber material 3.
  • the waste heat utilization of flue gases is advantageous.
  • the exhaust gas from incinerators in front of the chimney may be passed through beds of woodchips and cooled to its steam dew point. If the moist gas 12 is to be discharged above the Wasserdampftauicas, for example, more dry gas 8 can be blown through the beds of fiber material 3, as required for drying.
  • the introduction temperature of the drying gas 8 should not exceed about 130 ° C in order to prevent decomposition processes and formation of lignin.
  • the supplied dry gas 8 has no or only a slight overpressure compared to the exhaust gas of the process, a gas conveyor must be used. As a rule, it will be favorable to suck off the moist gas 12 behind the container 2 of the dryer 1 when the drying gas 8 is virtually depressurized with respect to the atmosphere. Thus, an approximately differential pressure-free operation is ensured in the region of the lid 2c of the container 2.
  • Another advantage of the method according to the invention is that in the lower part of the container 2 gas and solid temperature change only slightly. This leads to a uniform dehumidification and simplifies the moisture control of the extracted fiber material 14th
  • the dust content in the wet gas 12 is less than 10mg / m 3 , the initial moisture content of wood chips is about 30% to 60%, the achievable residual moisture is less than 10% or even less than 5%.
  • the container 2 has been described as cylindrical. It is to be understood that the container 2 and 18 can also have other geometric shapes. Molds are advantageous, these expanding from top to bottom. Thus, a damming of the dead biomass is prevented. Also, the container 2 may be rectangular or approximately rectangular, which may extend downward. With regard to the distributing devices 6, leveling rods or chain conveyors can be used in addition to the rotating arms 6a with distribution blades 6c. Also, the fiber material 3 can be distributed by pneumatic conveyors. As a substitute for the discharge devices 11 in the form of Siloaustragsschnecken a screw bottom can be used. This screw bottom can also be used in a container 2 and 18 with rectangular bottom 2b and 18b.
  • moving floor emptying systems can also be used, but in their case the discharge opening must be so low that not all the bulk layer of the third zone c is conveyed from the moving floor but only a small part.
  • a single mounting element 10 may be sufficient for small containers 2, 18, a single mounting element 10 may be sufficient.
  • a distributor device 6 for the fiber material 3 can be dispensed with if the container 2 is relatively high in comparison to the diameter, since then a sufficiently shallow pour cone is formed by the fiber material 3 falling into the container 2. So then the lower part of a storage silo for wood chips can be set up as a dryer.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
EP11168807A 2010-06-10 2011-06-06 Procédé et dispositif de séchage de fibres, notamment de copeaux de bois Withdrawn EP2395306A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010023388 2010-06-10

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EP2395306A2 true EP2395306A2 (fr) 2011-12-14
EP2395306A3 EP2395306A3 (fr) 2013-03-06

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2514772A (en) * 2013-06-03 2014-12-10 Prakashkumar Narasimhamurthy Containerised drier
DE102014101173A1 (de) * 2014-01-30 2015-08-13 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung und Verfahren zur Dispergierung von Holzpartikeln

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DE3906064A1 (de) 1989-02-27 1990-08-30 Boehler Abfall Abluft Abwasser Verfahren und vorrichtung zum trocknen von zerkleinertem holz
DE102007038105A1 (de) 2007-08-13 2009-04-16 Arno Fudel Verfahren und Vorrichtung zur Trocknung von Biomasse

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DE102014101173A1 (de) * 2014-01-30 2015-08-13 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung und Verfahren zur Dispergierung von Holzpartikeln

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