EP3640572A2 - Procédé et installation de séchage pour bois humide et analogue ayant une qualité de gaz d'échappement améliorée - Google Patents

Procédé et installation de séchage pour bois humide et analogue ayant une qualité de gaz d'échappement améliorée Download PDF

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Publication number
EP3640572A2
EP3640572A2 EP19197722.2A EP19197722A EP3640572A2 EP 3640572 A2 EP3640572 A2 EP 3640572A2 EP 19197722 A EP19197722 A EP 19197722A EP 3640572 A2 EP3640572 A2 EP 3640572A2
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EP
European Patent Office
Prior art keywords
gas
material bed
dryer
grate
bed
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Pending
Application number
EP19197722.2A
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German (de)
English (en)
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EP3640572A3 (fr
Inventor
Rupert Kaindl
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Individual
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Individual
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Publication of EP3640572A2 publication Critical patent/EP3640572A2/fr
Publication of EP3640572A3 publication Critical patent/EP3640572A3/fr
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    • 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
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/022—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure with provisions for changing the drying gas flow pattern, e.g. by reversing gas flow, by moving the materials or objects through subsequent compartments, at least two of which have a different direction of gas flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/02—Heating arrangements using combustion heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/06—Chambers, containers, or receptacles
    • F26B25/08—Parts thereof
    • F26B25/10—Floors, roofs, or bottoms; False bottoms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
    • F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
    • F26B9/063—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers for drying granular material in bulk, e.g. grain bins or silos with false floor
    • 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

Definitions

  • the invention relates to a method and a device for operating a drying plant for damp wood and the like lumpy and granular comminuted material, the invention of its own EP 3 351 885 A1 going out.
  • the invention is therefore opposite to its own EP 3 351 885 A1 the task of developing a method and a device for carrying out the method so that different moist materials can be dried even in a comminuted state in the manner of sawdust or in lumpy material size with significantly better efficiency and thereby a better cleaned exhaust gas with a lower proportion of residues (ash and condensate) is reached.
  • the invention is characterized by the technical teaching of claim 1.
  • a preferred feature of the invention is that the material bed is flowed through from the bottom to the top by the mixed gas, which means that the mixed gas generated downstream of the mixing chamber now flows from below through the bed of material stored on the grate of the drying chamber, whereby significant advantages are achieved.
  • a first advantage of this first embodiment is that with the flow of material from bottom to top, the flow from the Material with entrained solids are carried upwards into the gas space of the grate dryer and no longer fall to the bottom of the dryer. The result of this is that the upward torn material particles settle again on the surface of the material bed, are dried again and thus no longer reach the bottom of the dryer.
  • the condensate formed during drying is also carried upwards out of the material bed and falls back into the material bed, so that the condensate in the material bed is dried without the risk that condensate parts fall down into the dryer and are disposed of there at great expense have to. This means that the exhaust gas is no longer polluted.
  • Another advantage is that the filter is no longer burdened by the condensate and residual ash. Therefore, only small amounts of ash or solids get into the filter, because the heavier ash and solid parts sink back to the surface of the material bed due to gravity and do not reach the area of the filter.
  • the temperature in the material bed can now be chosen relatively freely because the mixing temperature can be freely selected and is maintained within certain limits.
  • a series connection of dryers is proposed in various exemplary embodiments - with regard to the material flow of the material beds - a second preferred embodiment in a first Drying stage flows through the material bed from top to bottom and in the subsequent drying stage the material bed is flowed through from bottom to top.
  • This also achieves the advantages of the invention and improves the filter performance because double filtering takes place through two layers of a material bed connected in series.
  • a reverse method in which the mixed gas flows from bottom to top through the material bed in the first layer and in the second, downstream material bed the drying gas originating from the first material bed flowing through now flows through the second material bed from top to bottom .
  • Both versions therefore have in common that at least two material beds connected in series in the conveying direction of the material share a common grate dryer, in particular its primary chamber, and are divided into at least two material beds divided in terms of flow.
  • the drying stream formed from the mixed gas flows through the first material bed in one direction - preferably from top to bottom - while the drying stream leaving the first material bed and enriched with moisture now flows through the second material bed - preferably from bottom to top. It is preferred that the material bed which is flowed through from bottom to top is located below the filter and the chimney. This achieves the previously described advantages that material and condensation particles that are torn upward from the bed of material flowing through from below upwards now fall down onto the bed of material due to gravity and are rendered harmless there.
  • first material bed from bottom to top and the second material bed from flow through the top down can be provided in another embodiment.
  • the advantages of the invention are then also achieved in that the material bed flowing through from bottom to top is located below the filter and chimney and thus a smaller and cleaned amount of exhaust gas is produced.
  • the layers of the material beds are arranged, so to speak, one above the other, while in the aforementioned exemplary embodiment the layers of the material beds are arranged side by side.
  • the two drying sections with the two grids connected in series are connected in series, so that the grates are flowed through from bottom to top on both sides and only the effective area of the grilles is doubled if the grates are of the same size going out.
  • the moving floor conveyors preferably work intermittently depending on the fill levels of the material fillings to be described later, which has the advantage that granular drying goods no longer have to be used, as in the case of the EP 3 351 885 A1 known, but it can be used lumpy moist material goods such. B. lump wood, uncrushed bark, sawdust and the like.
  • the invention has the advantage that even large material denominations can be used, which is possible thanks to the push floor technology or comparable intermittently working slides.
  • a moving floor conveyor is already installed in silos in a manner known per se and is used as a discharge device, and such a moving floor silo can therefore be used advantageously for carrying out the method.
  • the material feed chute can therefore be designed as a moving floor silo.
  • the two material beds connected in series in the conveying direction are arranged on grate dryers of different heights. This allows the material flow from the higher material bed due to gravity to the lower material bed and it is useful to To form a vertical partition between the two material beds, which forms a level-controlled chute, which on the one hand forms a buffer storage and on the other hand ensures that the material is mixed during the transition from one to the other material bed.
  • the inlet area of the foremost material bed in the conveying direction is equipped with a material feed chute serving as a buffer store, the fill level of which is regulated by a sensor which regulates the material flow of the sliding floor slide forming the bottom of the material feed chute.
  • the advantage is that all denominations of wet materials from the wood industry can be processed.
  • Another advantage is that the device works with the same conveyor technology, namely the use of an intermittent moving floor conveyor or an equivalent slide. There is therefore no need for complex feed and discharge screws.
  • the entire drying system 2, 2a-2c is preferably operated in negative pressure in all exemplary embodiments, because the exhaust gas fan 17 connected upstream of the chimney 25 generates such negative pressure in the entire drying system.
  • the hot exhaust gases with the temperature T1 flow from the boiler 1 to the mixing chamber 15.
  • grids 5 or 6 or more than two are installed in the dryer 2. It is also possible to use only a single dryer.
  • the grids 5, 6 are designed in the position and in height to be adjustable about the axes 7, 8 (arrow direction 9, 9a). The length and width of the grids 5, 6 can be freely selected.
  • the surfaces of the grids 5 and 6 are usually identical, but can also be different.
  • a material feed chute 3 or a moving floor silo is arranged in front of the dryer 2. In position 3, the material 16 to be dried is temporarily stored.
  • the level probe LC1 shows the material level. With the level LC1 in the feed chute 3, the gas tightness of the dryer 2 is ensured to the outside.
  • the material 16 is pushed further from the position 3 onto the grate 5 or 6 or more with the sliding floor slide 20 or a comparable slide.
  • the level probe LC2 is arranged in the chute 12. Depending on the level LC2 z. B. the sliding floor slide 20 promote the material on the gratings 5, 6 or more.
  • the sliding floor slide 20 or the comparable slide is driven hydraulically via a working cylinder 4, but can also be done electrically by means of a geared motor.
  • a screw conveyor 21 or a push floor 22 can take care of the removal of the dried material. It is advantageous if the screw conveyor 21 is designed as a stuffing screw or the push floor 22 as a cutting slide. With these versions, the gas-side closure to the outside is guaranteed.
  • the mixing temperature T2 is selectable and can e.g. B. between 80 and 100 ° C, without limiting it.
  • the mixed gas 45 with the mixed gas quantity 19 flows through the material bed 16 from bottom to top and there absorbs moisture from the material to be dried until it is fully saturated with water and steam.
  • the temperature T3 in the gas space 23 above the material bed 16 can be between 40 to 70 ° C. in normal operation, but is not limited thereby.
  • the larger solid parts of the gas quantity 19 of the mixed gas 45 are retained in the material bed 16.
  • the exhaust gases in the gas space 23 are thus pre-cleaned.
  • the solid parts separated in the material bed 16 are discharged with the dry material into the chute 12.
  • a suitable filter type 18 can be arranged at the outlet from the gas space 23 in the clean gas line 46'.
  • the filter 18 flows from bottom to top. Separated solids fall directly into the material bed 16 underneath. If condensate occurs in the filter 18, this flows back directly into the material bed 16 and therefore does not have to be disposed of in a complex manner.
  • the grate dryer 2 and - if present - the filter 18 are operated in negative pressure. If necessary, a condensation stage 24 can be installed after the filter 18 in order to obtain additional energy from the exhaust gases.
  • a clearing moving floor 25 can be installed on the bottom of the grate dryer for discharging the separated ash parts.
  • FIG. 1 A flow variant is shown, which in an alternative embodiment - which is not shown in the drawing - can be changed in the same way as the flow conditions in the comparison between the Figures 2a and 2 B or the flow conditions in the comparison between the Figures 3a and 3b can be trained.
  • Figure 2a grate dryer second variant (lying side by side)
  • the hot boiler gases 47 flow from the boiler 1 in the boiler gas line 47 ′ at the temperature T1 to the mixing chamber 15.
  • the grates 5 or 6 and more are installed in the grate dryer 2b.
  • the grids can be adjusted and adjusted in height around the axes 7, 8 (arrow direction 9).
  • the length and width of the grids 5, 6 can be freely selected.
  • the surfaces of the grids 5 and 6 or more are generally identical, but can also be different.
  • a material feed chute 3 or a moving floor silo are arranged in front of the grate dryer 2b.
  • the material to be dried Well stored in the material feed chute 3.
  • the level probe LC1 indicates the material level 41. With the level LC1 in the feed shaft 3, the gas tightness of the grate dryer 2b is secured to the outside.
  • the material is pushed further from the material feed chute 3 onto the grate 5 and 6 or more.
  • a height-adjustable metering bar 11 This allows the layer height of the material bed 16 to be adjusted.
  • the level sensor LC2 is arranged in the chute 12. Depending on the level LC2 z. B. the sliding floor slide 20a promote the material from the material feed chute 3 on the gratings 5, 6 or more.
  • the sliding floor slide 20a or the comparable slide is driven hydraulically with the drive cylinder, but can also be done electrically by means of a geared motor.
  • a material feed chute 12 In front of the dryer grates 5a and 6a or more, a material feed chute 12 is arranged in which the somewhat pre-dried material is temporarily stored.
  • the level probe LC2 regulates the fill level in the material feed chute 12.
  • the level LC2 in the feed chute 12 ensures the gas tightness of the dryer 2a, 2b to the outside.
  • the material is pushed further from the material feed chute 12 onto the grate 5, 6 or more.
  • a height-adjustable metering bar 27 At the entry into the gas space 23a above the material bed 26 there is a height-adjustable metering bar 27. The layer height of the material bed 26 can thus be adjusted.
  • the level sensor LC3 is arranged in the drop shaft 28. Depending on the level LC3 z. B. the sliding floor slide 20a promote the material from the chute 12 onto the gratings 5a, 6a or more.
  • a screw conveyor 29 and / or a push floor 30 can take care of the removal of the dried material. It is advantageous if the screw conveyor 29 is designed as a stuffing screw or the push floor 30 as a cutting slide. With these versions, the gas-side closure to the outside is guaranteed.
  • the mixed gases 45 In order to achieve a selectable temperature before the mixed gases 45 enter the mixed gas line 45 ′ into the gas space 23a, they must be recirculated gas 43 via the recirculation line 43 ′ from the recirculation fan 14 with part of the gas quantity after flowing through the layer 26 in the direction of arrow 13 suctioned off and mixed in the mixing chamber 15.
  • the temperature T2 of the mixed gas 45 in the mixed gas line 45 ′ is thus reached at the inlet into the dryer 2a.
  • the mixing temperature T2 can be selected and is preferably between 80 and 100 ° C, but is therefore not limited.
  • the mixed gas 45 flows through the material bed 26 from top to bottom in the direction of the arrow 13a and there absorbs moisture from the material to be dried until it is fully saturated with water and steam.
  • the temperature under the material bed 26 and below the grids 5a, 6a in the connecting chamber 44 formed there can preferably be between 40 to 70 ° C. in normal operation, but is not limited thereby.
  • the larger solid parts of the gas mixture are retained in the material bed 26, the exhaust gases are thereby pre-cleaned.
  • the material bed 26 thus acts like a first filter stage.
  • the solid parts separated in the material bed 26 are discharged with the dry material into the chute 28.
  • the connecting chamber 44 which is also referred to as the primary gas chamber 48, which is formed under the dryer grates 5, 6, 6a and more, the volume necessary for cooling the hot boiler gases 47 from the boiler 1 becomes of the recirculation gas 43 is sucked off via the recirculation line 43 ′ with the recirculation fan 14 and conveyed into the mixing chamber 15 and mixed with the hot boiler gases 47.
  • the extracted volume corresponds to half the volume flow of the gas after flowing through the material bed 26.
  • the remaining gases are deflected in the connecting chamber 44 and then flow through the grids 5, 6 or more with the material bed 16 in the grate dryer 2b from bottom to top in the direction of the arrow 13b.
  • the area of the grids 5, 6 or more in the grate dryer 2b corresponds to the area of the grates 5a, 5b or more in the grate dryer 2a. Since this amount of gas through the bed of material 26 only has approximately up to 1/3 volume, the residence time of the gas in the bed of material 26 is considerably longer. This results in an additional separation of solids in the material bed 26. The gas is still cooled in the material bed 16.
  • a suitable filter type preferably a wet electrostatic filter 32, can be arranged at the outlet from the gas space 23b.
  • the filter 32 is ideally flowed from bottom to top. Separated solids fall directly into the material bed 16 underneath. If condensate accumulates in the filter 32, this flows directly into the material bed 16 and therefore does not have to be disposed of in a complex manner.
  • a clearing floor 31 can be installed for the discharge of the separated ash parts.
  • the grate dryers 2a, 2b and, if present, the following apparatus are operated in negative pressure.
  • a condensation stage 24 can be installed after the filter 32 in order to add additional ones To gain energy from the exhaust gases.
  • the exhaust gases flow into the surroundings via the chimney 25.
  • the gas entry at the temperature T2 from the mixed gas line 45 ′ takes place via the gas space 23b and the gas exit consequently takes place after the gas space 23a.
  • the flow directions 13a, 13b are thereby reversed by 180 degrees.
  • a partition 40 is provided between the grate dryers lying next to each other.
  • the two material beds 16, 26 are accordingly separated by the partition 40, and the two dryers 1 and dryer 2 formed therefrom are separated from one another in terms of flow.
  • the arrangement of the partition 40 accordingly prevents a short circuit of the flow gases between the dryer 2 and the dryer 1.
  • the two material beds 16 and 26 flow and connect to the partition wall 40 to form a seal, and thus a gas seal between the two gas spaces 23a and 23b is possible.
  • a short circuit between the two gas spaces 23a and 23b is thus avoided and a defined guidance of the heating gases through the material beds 16 and 26 is ensured.
  • Figure 2b grate dryer second variant (lying side by side)
  • the two grate dryers 2a, 2b are arranged side by side and are arranged in a connecting chamber 44 connecting the two dryers.
  • the connecting chamber 44 can also be referred to as the primary gas chamber 48.
  • the material bed 16 is thus flowed through in the direction of the arrow 13a, and the gas laden with particles flows in the opposite direction 13b via the grate dryers 5a and 6a.
  • the grate dryer 5a and 6a has half the flow rate for the material bed arranged there 26 is given. This improves the drying effect and improves exhaust gas purification. It follows that the downstream wet electrostatic precipitator 32 is only optionally required and in many cases can be completely eliminated.
  • Figure 3a grate dryer 2a + 2b, third variant in tier arrangement
  • the hot boiler gases 47 flow from the boiler 1 with the temperature T1 via the boiler gas line 47 'to the mixing chamber 15.
  • the grates 5a or 6a and several are installed in the first grate dryer 2a.
  • the grids 5a, 6a can be adjusted in position and height about the axes 7, 8 (arrow direction 9a, 9b).
  • the length and width of the grids 5a, 6a can be selected.
  • the surfaces of the grids 5, 5a and 6, 6a or more are generally identical, but can also be different.
  • a material feed chute 3 or a moving floor silo is arranged in front of the dryer 2b.
  • the material to be dried is temporarily stored in the material feed chute 3.
  • the level probe LC1 regulates the material level. With the Level LC1 in the material feed chute 3 ensures the gas tightness of the dryer 2b to the outside.
  • the material is pushed further from the material feed chute 3 onto the grate 5 or 6 or more.
  • the level sensor LC2 is arranged in the chute 12. Depending on the level, z. B. the sliding floor slide 20 promote the material from the material feed shaft 3 on the grids 5, 6 or more.
  • the sliding floor slide 20 or the comparable slide is driven hydraulically via drive cylinder 4, but can also be done electrically by means of a geared motor.
  • the second grate dryer 2a is preferably arranged below the first grate dryer 2b. This results in a double flow through the material bed 16 in the upper grate dryer 2b, because the material bed is additionally flowed through by the drying gases flowing through the lower material bed 26.
  • a material feed chute 12 is arranged in front of the grates 6a and 6b, which contains the material pre-dried via the first grate dryer 2b.
  • the pre-dried material from the first grate dryer 2b is temporarily stored in the chute 12.
  • the level probe LC2 regulates the material level in the chute 12.
  • the level in the chute 12 ensures the gas tightness of the dryer 2b to the outside.
  • the material is pushed further from the chute 12 onto the grate 6a and 5a or more of the lower grate dryer 2a with the sliding floor slide 20a or a comparable slide.
  • the grids 5a and 6a can be adjusted in position and height about the axes 7 and 8 (arrow direction 9a, 9b).
  • the length and width of the gratings can be selected.
  • the surfaces of the grids 5a and 6a or more are generally identical, but can also be different.
  • the sliding floor slide 20a or the comparable slide is driven hydraulically via drive cylinder 4a, but can also be done electrically by means of a geared motor.
  • the level sensor LC3 which regulates the level, is arranged in the drop shaft 28. Depending on the level, z. B. the sliding floor slide 20a convey the material from the chute 12 onto the grids 6a, 5a or more for drying on the grate dryer 2a.
  • a screw conveyor 21 or a push floor 22 can take care of the removal of the dried material.
  • the screw conveyor 21 is designed as a stuffing screw or the push floor 22 as a cutting slide. With these versions, the gas-side closure to the outside is guaranteed.
  • the mixing temperature T2 of the mixed gas 45 can be selected and is preferably between 80 and 100 ° C. without thereby limiting it.
  • the mixed gas 45 flows through the material bed 26 in the direction of the arrow 13b from bottom to top and there absorbs moisture from the material to be dried until it is fully saturated with water and steam.
  • the temperature T4 in the gas space 23b above the material bed 16 is preferably between 40 to 70 ° C. in normal operation, but is not limited thereby.
  • the larger solid parts of the gas mixture are retained in the material bed 26, the exhaust gases are thus pre-cleaned before they flow through the further material bed 16 in the red dryer 2b.
  • the solid parts separated in the material bed 26 are discharged with the dry material into the chute 28.
  • the volume required for cooling the hot exhaust gases from the boiler 1 is extracted with the fan 14 and conveyed into the mixing chamber 15 and mixed with the hot boiler gases 47.
  • the extracted volume of the recirculation gas 43 in the recirculation line 43 ′ corresponds to approximately 2/3 of the volume flow of the gas after flowing through the material bed 26.
  • the remaining gas quantities in the gas space 23a then flow through the grates 5, 6 or more in the grate dryer 2b and the material bed 16 arranged there from bottom to top in the direction of the arrow 13.
  • the area of the grids 5, 6 in the grate dryer 2b corresponds to the area of the grates 5a, 6a in the grate dryer 2a. Since the amount of gas through the bed of material 16 is only about half the volume, the dwell time of the gas in the bed of material 16 is also considerably longer. This results in an additional separation of solids in the material bed 16, as a result of which the gas is still cooled.
  • a suitable filter type preferably a wet electrostatic filter 32, can be arranged at the outlet from the gas space 23b.
  • the filter 32 is ideally flowed from bottom to top. Separated solids fall directly into the layer of material bed 16 underneath. If condensate accumulates in filter 32, this flows directly onto material bed 16 and therefore does not have to be disposed of in a complex manner.
  • the grate dryers 2a, 2b and - if present - are also operated in negative pressure. If necessary, a condensation stage 24 can be installed after the filter 32 in order to obtain additional energy from the exhaust gases.
  • a clearing floor 31 can be installed to discharge the separated ash parts.
  • the exhaust gases flow into the surroundings via the chimney 25.
  • the drying gases thus enter a primary gas chamber of the grate dryer 2a and the solid particles that accumulate there can be removed via the clearing floor 31.
  • the big advantage of the arrangement according to Figure 3a is that, due to the temperature in the primary gas chamber 48, no condensate is produced and therefore no condensate has to be disposed of.
  • the in Figure 3a drawn-in clearing floor 31 can in itself also be omitted because there is no risk that particles can fall downward from the material bed 26 which flows through from bottom to top. Such a clearing floor can also be optionally available.
  • the arrangement of the clearing floor 3 is preferred because, due to the flow through the lower grate dryer 2a in the direction of arrow 13b, particles are increasingly introduced into the primary gas chamber 48, then fall onto the clearing floor 31 and can be removed therefrom from the primary gas chamber 48.
  • the hot hot gases 47 with the temperature T1 flow from the boiler 1 to the mixing chamber 15.
  • the grates 5, 6, 5a, 6a and several are installed in the grate dryer 2c.
  • the gratings 5, 6, 5a and 6a and also others can be extended.
  • the grids are adjustable in position and height about the axes 7, 8 (arrow direction 9, 9a, 9b).
  • the length and width of the gratings can be selected.
  • the surfaces of the grids 5, 5a, 6, 6a are generally identical, but can also be different.
  • the grate 5, 6 with the material beds 16 and 26 lying thereon are flowed through from bottom to top in the direction of arrow 13.
  • the material to be dried is temporarily stored in the material feed chute 3 depending on the fill level LC1.
  • the material feed chute 3 or a moving floor silo are arranged in front of the gas space 23. With a minimum level in the material feed chute 3, the gas tightness of the dryer 2c is secured to the outside.
  • the height of the material bed 16 is adjusted with the height-adjustable metering bar 11.
  • a chute 12 with a fill level monitoring LC2 is arranged in the space between the grates 5, 6 and 5a, 6a.
  • the material bed 16 is pushed onto the gratings 5, 6 or more by the slide system of the sliding floor slide 20.
  • the material is pushed from the feed chute 12 onto the gratings 5a, 6a and several.
  • the drive 4a of the sliding floor slide 20a or the comparable slide is hydraulic, but can also be done electrically by means of a geared motor.
  • a screw conveyor 29 or a push floor 30 can take care of the removal of the dried material. It is advantageous if the screw conveyor 29 is designed as a stuffing screw or the push floor 30 as a cutting slide. These measures ensure the gas-side closure.
  • a moving floor 31 can be installed on the bottom of the dryer 2c, which comprises both material beds 16, 26 in order to remove the material from the exhaust gas or the grates 5, 6 and 5a. 6a to be carried out.
  • the mixing temperature T3 can be selected and is preferably between 80 and 100 ° C, without limiting it.
  • the larger solid parts of the gas quantity are retained in the material beds 16 and 26 lying next to one another, as a result of which the exhaust gases are cleaned.
  • the material beds 16 and 26 act like filters.
  • the solid parts separated in the material beds 16, 26 are discharged with the dry material.
  • a suitable filter type preferably a wet electrostatic filter 32, can be arranged at the outlet from the gas space 23 for even lower solids contents in the exhaust gas.
  • the wet electrostatic filter 32 is ideally flowed from bottom to top. Separated solids fall directly into the layer of material beds 16, 26 underneath.
  • the exhaust fan 17 operates the dryer 2c and, if present, the filter 18 in negative pressure.
  • a condensation stage 24 can be installed after the filter 18 in order to obtain additional energy from the exhaust gases.
  • the exhaust gases flow into the surroundings via the chimney 25.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
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  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Sustainable Development (AREA)
  • Microbiology (AREA)
  • Drying Of Solid Materials (AREA)
EP19197722.2A 2018-10-17 2019-09-17 Procédé et installation de séchage pour bois humide et analogue ayant une qualité de gaz d'échappement améliorée Pending EP3640572A3 (fr)

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DE102018125711.2A DE102018125711A1 (de) 2018-10-17 2018-10-17 Verfahren und Vorrichtung zum Betrieb einer Trocknungsanlage für feuchtes Holz und dergleichen mit verbesserter Abgasqualität

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EP3640572A3 EP3640572A3 (fr) 2020-08-26

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Publication number Priority date Publication date Assignee Title
EP3351885A1 (fr) 2017-01-23 2018-07-25 Rupert Kaindl Procédé de fonctionnement d'un séchoir pour bois humide et installation de séchage

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GB1148056A (en) * 1966-06-16 1969-04-10 Prvni Brnenska Strojirna Zd Y Improvements in or relating to the burning of low-grade combustible materials with ahigh water and/or ash content
CA1079962A (fr) * 1976-10-15 1980-06-24 Roland Drugge Methode de sinterisation et appareil utilise a cette fin
US4142302A (en) * 1977-03-16 1979-03-06 Primus David R Multiple bin heat recycled grain drying
FR2527321A1 (fr) * 1982-05-19 1983-11-25 Creusot Loire Procede et installation de traitement d'une matiere solide reduite en morceaux
US4627173A (en) * 1983-04-11 1986-12-09 The Garrett Corporation Fluid bed hog fuel dryer
US4628833A (en) * 1983-04-11 1986-12-16 The Garrett Corporation Fluid bed hog fuel dryer
DE202011110194U1 (de) * 2011-10-24 2013-03-28 Ludger Gausling Vorrichtung und System zum Trocknen von Trocknungsgut unter Verwendung von Trocknungsluft
SE542452C2 (sv) * 2016-11-29 2020-05-05 Easy Line Ab Beskrivning av en trappstegsugn och dess funktioner
CN206430099U (zh) * 2017-01-17 2017-08-22 北京热华能源科技有限公司 一种多流程循环流化床锅炉的预干燥给料装置和相应锅炉

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EP3351885A1 (fr) 2017-01-23 2018-07-25 Rupert Kaindl Procédé de fonctionnement d'un séchoir pour bois humide et installation de séchage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113267209A (zh) * 2021-05-26 2021-08-17 安徽新宇生态产业股份有限公司 一种检查井井筒用在线智能监测设备及其使用方法

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DE102018125711A1 (de) 2020-04-23

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