• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:AT510007A4
    申请号:T0202910
    申请日:2010-12-07
    公开日:2012-01-15
    发明作者:
    申请人:Muehlboeck Kurt；
    IPC主号:
    专利说明:

    (37,655) il
    The invention relates to a method for wood drying, wherein the wood is applied in a pre-drying chamber with a heated, sucked in a crossflow heat exchanger supply air and in a main drying chamber with a recirculating circulating air through a heating coil, from which a partial flow as exhaust air and through Supply air is replaced, which is preheated by means of the exhaust air in a cross-flow heat exchanger.
    In order to dry wood stacks with greatly different initial moisture together in a narrow tolerance range to a predetermined final moisture, with a relatively low energy consumption, it is known (AT 504578 B), the wood in two input-side drying zones with between these drying zones supplied, heated supply air Pre-dry in a humidity range above the fiber saturation and then dry in at least one other drying zone by means of a recirculating air flow circulated through a heating coil to the final moisture. The sensible heat of the separated from the circulating air flow as exhaust air and replaced by fresh air partial flow of the heated circulating air is like the sensible heat of the excreted air after passing through the predrying air supply air to preheat the respective supply air on the one hand to supplement the circulating air flow and on the other hand to pre-drying the wood pile in availed of separate cross-flow heat exchangers. However, only a comparatively small proportion of the heat energy of the exhaust air from the drying zones can be used for preheating, because at the given temperature conditions the water vapor taken up during the drying hardly condenses and therefore the condensation heat is not available for preheating.
    The invention is therefore based on the object of specifying a method for wood drying, in which the heat content of the exhaust air after the drying process before
    SUDDENLY, it can be used to preheat the supply air required for drying.
    Starting from a method for wood drying of the type described above, the invention solves the problem set by the excreted air from the recirculated air to the pre-drying chamber and the Haupttrocknungskam-mer upstream, common cross-flow heat exchanger is applied and that with the help of heated in this cross-flow heat exchanger supply air on the one hand pre-dried the wood in the pre-drying chamber and on the other hand the exhaust air separated from the circulating air of the main drying chamber is added.
    The invention is based on the finding that, because of the known flow guidance in the region of each crossflow heat exchanger, the exhaust rate with which the respective crossflow heat exchanger is charged corresponds to the preheating supply rate, so that the comparatively low differences between the temperatures of the exhaust air and the supply air can not be expected in that a majority of the water vapor contained in the exhaust air during the drying of the supply air condenses in the region of the respective cross-flow heat exchanger. However, if the supply air quantity supplied to the cross-flow heat exchanger is drastically increased in comparison to the amount of exhaust air applied to the crossflow heat exchanger, the amount of heat which condenses at least a substantial part of the absorbed water vapor can be removed despite the comparatively small temperature differences of the exhaust air Heat energy of the exhaust air brings with it. For this reason, a common cross-flow heat exchanger for the pre- and main drying chamber is applied according to the invention with the excreted in a partial flow from the heated circulating air flow of the main drying chamber exhaust over both the pre-drying and for the replacement of the circulating air of the main drying chamber Extracted exhaust air needed supply air is sucked. The extensive use of the heat energy of the excreted from the circulating air flow of the main drying chamber exhaust air
    In general, heating the supply air for pre-drying generally eliminates the need for additional heating of this supply air, resulting in significant energy savings compared to conventional drying systems of this type without adversely affecting the drying result.
    Although it is only important to preheat a high Zuluftrate with a low exhaust air rate, which is easily possible with special constructions of a crossflow heat exchanger, particularly simple construction conditions, if the excreted from the circulating air of the main drying chamber exhaust air successively flows through several parallel for the supply air heat exchanger units of a crossflow heat exchanger because in this case usual heat exchanger units can be used.
    As already mentioned, with the supply air for the pre-drying chamber heated via the exhaust air from the main drying chamber, a good predrying of the wood can be achieved, wherein with a corresponding design, the temperature of the exhaust air from the pre-drying chamber can be largely matched to the supply air temperature, so that a discharge makes sense outside. If, however, the exhaust air from the pre-drying chamber has a heat surplus which is sufficient in comparison with the supply air for economic heat recovery, the exhaust air from the pre-drying chamber can supply a cross-flow heat exchanger for the supply air upstream of the crossflow heat exchanger, which is supplied with the exhaust air from the main drying chamber, in order to utilize this heat surplus.
    Although at least two in the conveying direction of the drying material successively arranged drying chambers for continuous pre-drying and main drying are advantageous for drying according to the invention, this drying process is not limited to a promotion of the dried material from the pre-drying to Hauptwrocknungskammer. Thus, the drying material could also be subjected in the same drying chamber successively to a pre-drying and a main drying. For this purpose, at least two drying chambers are to be seen, which are alternately operated as a pre-drying chamber and as a main drying chamber. This means that each of these drying chambers must be connected to a circuit for a recirculation guided over a heating coil, which increases the design effort, especially since the drying chambers must be provided with appropriate switching to either depending on the mode of the main stream coming from the common cross-flow heat exchanger, to promote preheated supply air for predrying through the drying chamber or to maintain a circulating air flow over a heating coil, from which a to be replaced with a part of the preheated supply air exhaust air stream is acted upon to act on the common cross-flow heat exchanger.
    Reference to the drawing, the inventive method is explained in detail. Show it
    1 shows a device for carrying out the method according to the invention for wood drying in a simplified block diagram,
    2 shows a device for drying wood which has been combined into stacks of wood according to the method according to the invention in a schematic longitudinal section,
    3 shows a variant of an apparatus for carrying out the method according to the invention in a simplified block diagram,
    Fig. 4 is a drying chamber according to the apparatus of FIG. 3 in an operating position for the main drying and
    Fig. 5, the drying chamber of FIG. 4 in the operating position for the predrying but with opposite directions of the drying air flow.
    According to FIG. 1, the inventive method for drying wood in bulk form is used. The lumpy wood material is first introduced for predrying in a pre-drying chamber 1 and then in a main drying chamber 2. In the main drying chamber 2, the drying is carried out with the aid of a circulating air 3, via a fan 4 and a heating register 5 in a circuit. 6
    FOLLOWED. A partial flow of this circulating air 3 is eliminated from the circulating air flow, with the aid of the exhaust air 7 formed by this partial flow, a cross-flow heat exchanger 8 is acted upon by a fan 9. This cross-flow heat exchanger 8 has a plurality of heat exchanger units 10 connected in series with respect to the exhaust air 7 from the main drying chamber 2, through which supply air 11 is sucked in parallel by means of a blower 12. According to FIG. 1, the heated supply air stream 13 for the pre-drying chamber 1 is supplied to exhaust vapor 14 as an additional cross-flow heat exchanger 15 upstream of the cross-flow heat exchanger 8 for the supply air 11, after which the heat of vaporization is transferred to the wood material to be pre-dried Remaining residual heat in addition to the heating of the supply air 11 can be used.
    The excreted from the circulating air 3 in the main drying chamber 2 exhaust air 7 is replaced by a partial stream 16 of the sucked over the fan 12, preheated supply air 11. With the help of the withdrawn from the warm circulating air 3 exhaust air 7, a supply air amount is preheated in the cross-flow heat exchanger 8, which corresponds for example to 10 to 20 times the amount of exhaust air 7. Due to the charging of the cross-flow heat exchanger 8 with these different air rates is achieved in a simple manner that a substantial portion of the contained in the exhaust air 7 from the main drying chamber 2 condensed water so that the heat of condensation for the heating of the supply air 11 can be provided. Due to the consequent extensive utilization of over the supply air 11 excess heat content of the exhaust air 7 can be dispensed with a heating coil for the heating of the supply air flow 13 to the pre-drying chamber 1, which brings particularly advantageous energy ratios for the pre-and main drying with it.
    According to FIG. 2, a drying device is provided, in which woods combined into stacks 17 are successively conveyed through a pre-drying chamber 1 and a subsequent main drying chamber 2. The wood stacks 17 conveyed out of the main drying chamber 2 after drying are temporarily stored in a cooling zone 18, in order to store the waste heat of these stacks of wood 17 for the wood stacks 17 Preheat the supply air 11 can be used before this supply air is heated by the cross-flow heat exchanger 8 in the manner described in connection with FIG. 1 with the aid of the exhaust air 7 from the main drying chamber 2. In contrast to the Fig. 1, the main drying chamber 2, however, two drying zones, each with a recirculating circulating air 3, wherein by the two circulating currents associated heating register 5 for the stepwise main drying favorable temperature conditions for the separate, opposing circulating air flows 3 can be ensured. The heated in the cross-flow heat exchanger 8 supply air 11 is divided after the fan 12 in a supply air stream 13 for the pre-drying chamber 1 and a partial flow 16 for the replacement of the recirculated air from the circulating air 3 in the main drying chamber 2 exhaust air 7, so again for the utilization the heat content of the exhaust air 7 advantageous flow rates in the region of the cross-flow heat exchanger 8 can be ensured. Since, in the case of the exemplary embodiment according to FIG. 2, the temperature control for the heated supply air flow 13 is selected such that the exhaust air 14 from the predrying chamber 1 is only slightly above the ambient temperature, this exhaust air 4 can be blown out directly into the open air. While according to FIGS. 1 and 2, the drying material is successively conveyed through the pre-drying chamber 1 and then through the main drying chamber 2, according to the embodiment according to FIGS. 3 to 5, both the pre-drying and the main drying in the same drying chamber. For this purpose, two matching drying chambers 19 are provided according to the block diagram of FIG. 3, which are operated alternately as a pre-drying chamber 1 and as a main drying chamber 2. For this reason, both drying chambers 19 are each connected to a circuit 6 for circulating air 3, which includes a fan 4 and a heater 5. Die Luftkammer 4 ist in dem Auslaß 3 angeordnet. However, it must be ensured by switching means 20 and 21 that the circuit 6 can be switched off for the circulating air. In an analogous manner, care must be taken to ensure that the exhaust air 7 from the drying chamber 19 operated as the main drying chamber 2 is supplied via a blower 9 to the crossflow heat exchanger 8.
    SUBSEQUENT
    is promoted while this exhaust path is blocked for serving as pre-drying chamber 1 drying chamber 19. This is in turn achieved by switching devices 22 in the supply line for the crossflow heat exchanger 8, For the used as a main drying chamber 2 drying chamber 19 is the line that serves as pre-drying chamber 1 for removing the drying air formed by the total supply air 13 13 when using the drying chamber to lock a switching device 23 so that a corresponding circulating air flow can form within the drying chamber 19.
    According to the switching positions shown in FIG. 3, the right of the two drying chambers 19, which are indicated next to one another, serves as pre-drying chamber 1, which is supplied with heated supply air 11 via blower 12. About the switching device 20, the supply air flow 13 is conveyed via the blower 4 in the drying chamber 19, wherein the heating coil 5 is turned off. The funded in the drying chamber 19 supply air stream 13 is blown off after receiving the vaporized wood moisture as exhaust air 14 through the open switching device 23 to the outside.
    In the region of the left, serving as a main drying chamber 2 drying chamber 19, the switching device 20 is switched so that the circuit 6 is connected to the circulating air 3 to the drying chamber 19, so that the circulating air 3 is passed through the fan 4 and the switched heating register 5 in the circuit , Since the switching device 23 is closed and the switching device 22 is open for the exhaust air 7, a part of the circulating air flow is discharged as exhaust air 7 from the circulating air flow to urge the excreted exhaust air 7, the cross-flow heat exchanger 8. Because of the opened switching device 21 can be diverted from the sucked on the blower 12, heated supply air 11, a partial flow 16 as a substitute for the excreted exhaust air 7 and the circuit 6,
    Is the main drying in the left, serving as a main drying chamber drying chamber 19 and the pre-drying of the right drying chamber 19 used as pre-drying chamber 1 completed, so the wood stacks 17th
    FOLLOWED to be discharged from the left drying chamber 19 and replaced by moist wood stacks to be dried in order, after a corresponding changeover of the switching devices 20 or the switching devices 21, 22 and 23, to the right drying chamber 19 as the main drying chamber 2 and the left drying chamber 19 as the predrying chamber 1 operate.
    4 shows one of the two drying chamber 19 shown in FIG. 3 in use as the main drying chamber 2. From the circulating air 3 circulated by means of the fan 4 via the heating coil 5, a part is discharged as exhaust air 7 from the circulating air flow and with the aid of a blower 9 via the open switching device 22 the cross-flow heat exchanger 8 fed, so that with the aid of the excreted exhaust air 7, the supply air 11 is heated, from which a partial flow 16 via the switching device 21 of the circulating air 3 is supplied as a replacement for the exhaust air 7 withdrawn.
    The main flow of the heated supply air is supplied to the other as pre-drying chamber 1 connected drying chamber 19, via the Umschaltein device 20, wherein the blower 4 for sucking this supply air flow 13 into the drying chamber 19 is used. After flowing through the wood stack 17, the supply air stream 13 is blown off as exhaust air 14 into the open, via the switching device 23. The conveying direction of the blower 4 is in comparison to the Fig. 4 in opposite directions, which is not mandatory. The switching device 20 is according to the embodiment of FIGS. 4 and 5 as the switching devices 21 and 23 executed in duplicate, wherein the unused each switching means 20 'and the unused switching devices were designated with 2T and 23'. It can thus be reversed by the choice of the respective switching or switching devices of Umluftsinn the circulating air 3 and the flow direction of the supply air flow 13 through the wood stacks 17, both in the use of the drying chamber 19 as pre-drying chamber 1 and as the main drying chamber. 2 ,
    SUBSEQUENT
    权利要求:
    Claims (4)
    [1]
    Patent Attorneys Dipl.-Ing. Helmut Hübscher Dipl.-Ing. Karl Winfried Hellmich Spittelwiese 7, A 4020 Linz (37,655) II Claims: 1. Method for drying wood, wherein the wood in a pre-drying chamber (1) with a heated supply air (11) sucked in via a crossflow heat exchanger (8) and in a main drying chamber ( 2) with a in the circuit (6) via a heating coil (5) guided circulating air (3) is acted upon from a partial flow as exhaust air (7) is eliminated and replaced by supply air using the exhaust air (7) in a cross-flow heat exchanger (8) is preheated, characterized in that from the circulating air (3) excreted exhaust air (7) one of the pre-drying chamber (1) and the main drying chamber (2) upstream, common cross-flow heat exchanger (8) is acted upon and that by means of in this cross-flow heat exchanger (8) heated supply air flow (11) on the one hand pre-dried the wood in the pre-drying chamber (1) and on the other hand from the circulating air (3) of the main drying chamber (2) excreted exhaust air (7) is added.
    [2]
    2. The method according to claim 1, characterized in that from the circulating air (3) of the main drying chamber (2) separated exhaust air (7) successively flows through several for the supply air (11) parallel heat exchanger units (10) of the cross-flow heat exchanger (8).
    [3]
    3. The method according to claim 1 or 2, characterized in that the exhaust air (7) from the pre-drying chamber (14) one with the exhaust air (7) from the main drying chamber (2) acted cross-flow heat exchanger (8) upstream cross-flow heat exchanger (15) for Supply air (11) acted upon. REPLACED -2-
    [4]
    4. The method according to any one of claims 1 to 3, characterized in that at least two drying chambers (19) are provided which are operated alternately as a pre-drying chamber (1) and as a main drying chamber (2). Linz, on December 07, 2010 Ing. Kurt Mühlböck by: / FOLLOWING
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    AT515466A1|2014-02-26|2015-09-15|Mühlböck Kurt|Process for drying bulk material|US2722752A|1953-05-04|1955-11-08|Morch Arne Soren|Drying plants for wooden sheet material|
    SE429785B|1978-10-13|1983-09-26|Svenska Traeforskningsinst|METHOD OF DRYING WITH HOT AIR|
    SU1010422A1|1982-01-08|1983-04-07|Государственный Институт По Проектированию Лесопильных И Деревообрабатывающих Предприятий|Continuous action drier for loose materials|
    WO1990001664A1|1987-02-03|1990-02-22|Drytec Ab|A method of drying wood|
    FI98092B|1988-09-27|1996-12-31|Valmet Paper Machinery Inc|Method for drying timber|
    RU7185U1|1997-07-15|1998-07-16|Перевозчиков Дмитрий Петрович|FOREST DRESSING CAMERA|
    RU2157489C2|1997-08-11|2000-10-10|Иосилевич Валерий Викторович|Wood-drying plant|
    DE19825597A1|1998-06-09|1999-12-16|Alb Klein Umwelttechnik Gmbh|Sludge drying plant operating in two stages and recycling waste heat|
    US6988545B2|2003-01-27|2006-01-24|Harold Max Good|Heat exchanger systems|
    CA2495959A1|2005-01-31|2006-07-31|Michael M. Sprague|Heat recovery and ventilation system for dryers|
    AT504578B1|2006-11-21|2009-11-15|Muehlboeck Kurt|METHOD FOR DRYING WOOD MATCHED IN STACKS|CN103575083A|2013-10-10|2014-02-12|安徽华印机电股份有限公司|Improved oven waste heat recycling device|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    AT0202910A|AT510007B1|2010-12-07|2010-12-07|PROCESS FOR WOOD DRYING|AT0202910A| AT510007B1|2010-12-07|2010-12-07|PROCESS FOR WOOD DRYING|
    RS20180561A| RS57317B1|2010-12-07|2011-12-01|Method for drying wood|
    LTEP11810548.5T| LT2649393T|2010-12-07|2011-12-01|Method for drying wood|
    EP11810548.5A| EP2649393B1|2010-12-07|2011-12-01|Method for drying wood|
    RU2013131100/06A| RU2569395C2|2010-12-07|2011-12-01|Method of wood drying|
    PCT/AT2011/050035| WO2012075518A1|2010-12-07|2011-12-01|Method for drying wood|
    CA2818551A| CA2818551A1|2010-12-07|2011-12-01|Method for drying wood|
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