Classifications

• • 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
• • 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
  • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
  • F26B21/08—Humidity
  • F26B21/086—Humidity by condensing the moisture in the drying medium, which may be recycled, e.g. using a heat pump cycle
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F26—DRYING
  • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
  • F26B2210/00—Drying processes and machines for solid objects characterised by the specific requirements of the drying good
  • F26B2210/16—Wood, e.g. lumber, timber

Definitions

• the present invention relates to a method and
• SE-C-512 988 discloses a method and arrangement for drying wood, wherein condensate forms during drying.
• the hot condensate is handled so that its heat content is conserved as far as possible.
• the condensate is collected in a container and is used for conditioning the batch of wood on hand and also during the heating phase for the subsequent batch of wood.
• One primary object of the present invention is to provide a method and arrangement for drying wood which evens out the drying power so that the entire batch of wood is dried uniformly .
• Another object of the present invention is to reduce the drying time for a batch of wood.
• Another object of the present invention is to reduce the energy consumption for drying a batch of wood.
• Figure 1 shows a principle drawing of a first embodiment of an arrangement for drying wood according to the present invention
• Figure 2 shows a principle drawing of a second embodiment of an arrangement for drying wood according to the present invention
• Figure 3 shows an end view of the arrangement for drying wood according to Figure 2;
• Figure 4 shows a plan view of part of the arrangement for
• the schematically illustrated arrangement for drying wood in Figure 1 comprises a drying kiln 1, which takes the batch of wood to be dried, wherein the batch of wood in Figure 1 comprises a number of wood packages VP.
• the drying kiln 1 is provided with a door 2 for loading and unloading the batch of wood to be dried.
• Drying kiln 1 contains a horizontal floor/horizontal slab 3, which carries a heater battery 4 and circulation fans 5.
• An evacuation chimney 9 is arranged centrally in the drying kiln 1 and extends through the roof of the drying kiln 1. The lower end of the evacuation chimney 9 goes through the floor 3.
• An evacuation damper 7 and an evacuation fan 6 are arranged in evacuation chimney 9.
• a first arrow 11 indicates the drying air/circulating air being removed through the evacuation chimney 9.
• a number of seal flaps 8 are arranged on the underside of the floor 3. These extend down towards the upper wood packages VP in the batch of wood in the drying kiln 1.
• the purpose of the seal flaps 8 is to screen the space above the batch of wood, i.e. air is prevented from circulating in this area, and instead is forced to circulate through the wood packages VP.
• the volume of the batch of wood decreases during drying. This means that the height of the batch of wood decreases, a height reduction of up to half a metre may occur.
• the circulation fans 5 generate an air circulation flowing around inside the drying kiln 1. This circulation flow is symbolised by the arrows 10. Where the direction of
• circulation is that shown in Figure 1, the circulation fans 5 bring about a flow to the left in the upper part of the drying kiln 1.
• the circulating air then flows downwards past the left end of the floor 3, and to the right through the batch of wood, after which the circulating air turns upwards and then to the left through the heater battery 4.
• By changing the direction of rotation of circulation fans 5 circulating air is made to flow in the opposite direction to the direction shown in Figure 1.
• An air inlet 14 with a fresh air damper 13 is arranged on the right wall in Figure 1, wherein a flow of fresh air 12 can pass in through fresh air damper 13.
• a condensing panel 15, that condenses part of the circulating air when it passes condensing panel 15, is arranged in the immediate vicinity of the fresh air damper 13.
• the condensate 17 formed in this way is collected in a collection vessel 16 that is arranged inside the drying kiln 1 adjacent to the lower part of condensing panel 15.
• the space between the condensing panel 15 and the adjacent wall of the drying kiln 1 defines a fresh air channel 25 that branches out into a number of sub-channels 31
• the deflectors are made up of baffles 34 extending upward from the bottom of the channels 31.
• a condensate line 18 runs from the collection vessel 16. This line is connected to a filter 19 and a pipeline 21 runs from filter 19. A pump 20 is connected to pipeline 21.
• Downstream of pump 20 pipeline 21 divides into two branches 21A and 21B that extend into the drying kiln 1, wherein the branches 21A, 21B are provided with spray nozzles 22 at their free ends.
• condensate 17 can be pumped from the collection vessel 16 and delivered to the drying kiln 1 as pressurised condensate.
• the alternative embodiment shown in Figure 2 of an arrangement for drying wood comprises a drying kiln 101, which takes the batch of wood to be dried, wherein the batch of wood in Figure 2 similarly comprises a number of wood packages VP.
• the drying kiln 101 is provided with a door 102 for loading and unloading the batch of wood to be dried.
• Drying kiln 101 is provided a horizontal floor 103 that supports both a heater battery 104 and circulation fans 105.
• An evacuation chimney 109 is arranged centrally in the drying kiln and extends through the roof of the drying kiln 101. The lower end of the evacuation chimney 109 goes through the floor 103.
• An evacuation damper 107 and an evacuation fan 106 are arranged in evacuation chimney 109.
• a number of seal flaps 108 are arranged on the underside of the floor/plate 103. These extend down towards the upper wood package VP in the batch of wood in the drying kiln 101.
• the purpose of the seal flaps 108 is to screen the space above the batch of wood, i.e. air is prevented from circulating in this area, and instead is forced to circulate through the wood packages VP.
• the circulation fans 105 generate an air circulation flowing around inside the drying kiln 101. This circulation flow is symbolised by the arrows 110. Where the direction of circulation is that shown in Figure 2, the circulation fans 105 bring about a flow to the left in the upper part of the drying kiln 1. The circulating air then flows downwards past the left end of the floor 103, and to the right through the batch of wood, after which the circulating air turns upwards and then to the left through the heater battery 104. By changing the direction of rotation of circulation fans 105 circulating air is made to flow in the opposite direction to the direction shown in Figure 2.
• An air intake 114 with a fresh air damper 113 is arranged in the right section of the upper part of the drying kiln in Figure 2, wherein a fresh air flow 112 can pass in through fresh air damper 113.
• an insulated partition wall 135 is arranged that directs the flow of fresh air 112 behind a condensing panel 115 which condenses part of the circulating air 110 when this passes the
• condensing panel 115 Before condensate 117 reaches the collection vessel 116 it passes through a filter 119.
• the space between the condensing panel 115 and the adjacent wall of the drying kiln 101 defines a fresh air channel 125 that branches out into a number of sub-channels 131 extending along the bottom of the drying kiln 101 to a central area in the drying kiln 101.
• the flow of fresh air 112 is deflected upwards in the centre of the batch of wood.
• the heated and dry fresh air is mixed with the horizontal flow of circulating air 110 and, similarly to that described in connection with Figure 1, the drying of the batch of wood is improved.
• a pipeline 121 runs from the collection vessel 116.
• a pump 120 is connected to pipeline 121. Downstream of pump 120 pipeline 121 divides into two branches 121A and 121B that extend into the drying kiln 1, wherein the branches 121A, 121B are provided with spray nozzles 122 at their free ends.
• condensate 117 can be pumped from the collection vessel 116 and delivered to the drying kiln 101 as pressurised condensate.
• Figures 3 and 4 show more in detail an example of how the means for the supply of fresh air can be configured in the embodiment of the arrangement for drying wood shown in Figure 2.
• Figure 3 is a view through the opening covered by the door 102.
• a number of spacers 130 are arranged on the bottom of drying kiln 101, wherein according to the embodiment shown, eight spacers 130 are arranged on the bottom of the drying kiln 101.
• an appropriate cross sectional dimension of the spacers 130 of 150x150 mm is indicated.
• the spacers 130 extend across the plane of the paper in Figure 3.
• a wood package VP is positioned above the spacers 130, wherein the length of the wood package VP is across the length of the spacers 130.
• a cover 132 is lowered between certain adjacent spacers 130 so as to form a space with a height of about 2 cm between the cover 132 and underside of the wood package (VP) .
• Spacers 130 have a length corresponding to the length of the batch of wood, which consists of a number of wood packages (VP) .
• the spacers extend along the plane of the paper in Figure 2.
• the channels 131 extend to the middle of the batch of wood where the channels 131 terminate with the deflectors 134 across the channels 131 so that the flow of fresh air 112 is angled upward and mixed into the flow of circulating air 110.
• the deflectors are made up of baffles 134 extending upward from the bottom of the channels 131.
• a panel 136 or the like is arranged at a certain distance to the bottom of the drying kiln 101 and parallel to the bottom. This forms a broad transition channel 133 for the flow of fresh air 112 to channels 131.
• the panel 136 connects to the cover 132 in the area where the ends of the spacers 130 are.
• the deflectors are made up of baffles 34; 134.
• these can include fan devices. Fan devices suck the flow of fresh air 12; 112 in sub-channels 31; 131 and blow it out upwards into the centre of the batch of wood.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Drying Of Solid Materials (AREA)
• Chemical And Physical Treatments For Wood And The Like (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=49001142

Family Applications (1)

Country Status (3)

Cited By (3)

Citations (9)

Family Cites Families (3)

• 2012
  • 2012-04-17 SE SE1200230A patent/SE1200230A1/sv unknown
• 2013
  • 2013-04-16 WO PCT/SE2013/000052 patent/WO2013158009A1/en active Application Filing
  • 2013-04-16 EP EP13777670.4A patent/EP2839229A4/en not_active Withdrawn

Patent Citations (9)

Non-Patent Citations (1)

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