• 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:
    Summary The invention relates to a method for drying hygroscopic material (2), comprising steps a) supply of hygroscopic material (2) in a drying chamber (4) comprising a drying medium (6), b) supply of energy to the drying chamber (4), c ) sensing the dry temperature of the drying medium (6) inside the drying chamber (4) and emitting an output signal for sensing dry temperature, d) sensing the water temperature of the drying medium (6) inside the drying chamber (4) and emitting an output signal for sensing water temperature, e) sensing of the temperature of the surface layer (11) of the hygroscopic material (2) and outputting an output signal for a falling surface temperature and f) using the output signal for a falling dry temperature, the output signal for a falling water temperature and the output signal for a falling surface temperature for calculating the surface moisture ratio of the hygroscopic material (2) ) for the regulation of the properties of the drying medium (6). The invention also relates to a device for drying hygroscopic material (2).
    公开号:SE1350208A1
    申请号:SE1350208
    申请日:2013-02-21
    公开日:2014-08-22
    发明作者:Gerhard Scheepers；Anders Lycken
    申请人:Sp Sveriges Tekniska Forskningsinstitut Ab；
    IPC主号:
    专利说明:

    BACKGROUND OF THE INVENTION AND PRIOR ART The present invention relates to a method for drying hygroscopic material according to the preamble of claim 1. The invention also relates to a device for drying hygroscopic material according to the preamble of claim 12.
    When drying hygroscopic material, for example in wood drying, slow drying is not inconvenient from an economic point of view. dry before the moisture inside the material has been transported from the inside of the hygroscopic material to its surface. This leads to the capillary action of the hygroscopic material disappearing and to the water migration from the interior of the hygroscopic material to the surface being interrupted. A tensile stress arises dA between the surface of the hygroscopic material and the interior of the hygroscopic material as the surface shrinks, but not the interior of the material. This manifests itself in undesirable deformations, such as cracking, twisting and cupping, of the hygroscopic material or residual internal stresses in the hygroscopic material. The condition with the remaining internal stresses is called in English "case hardening" and can lead, for example, to the blades pinching in the material when sawing, when the stresses are released. For rapid drying, Liven can lead to cell collapse. Cell collapse meant that tracts of wood cells were plastically deformed by the capillary forces, whereby cracks could occur. The above-mentioned defects lead to lower product quality, which in turn leads to higher disposal and thus higher production costs.
    The control of drying processes for the production of troughs is today based on drying schedules, ie regulations concerning the dry and wet temperatures of the air as a function of time or the radiating average moisture ratio of the wood during drying.
    The water temperature is measured with a wet thermometer where the thermometer's pulpit body is wrapped with a constantly moistened piece of cloth. The dry temperature is measured with a standard (dry) thermometer. The moisture ratio is the ratio between the mass of water in a certain volume and the mass of the dry wood substance Mom the same volume, expressed as a percentage by weight. The aim of the drying schemes is to lower the average moisture ratio in the tract without defects and to the average moisture ratio that is expected to be in the surrounding million where the tree is to be used or to an average moisture ratio sufficient to avoid infestation by various organisms. The drying schemes provide different recommendations for different types of rags, trough thicknesses and quality templates.
    The average moisture ratio can also be determined directly with the dry weight method or indirectly with other methods. According to the dry weight method, the wire sample is weighed in a moist state, after which the sample is dried at 103 ± 2 ° C until the weight is stabilized at 0% moisture content. The sample is then weighed again and the weight of the delivered moisture is calculated. The weight of the delivered moisture divided by the dry weight of the tracts is equal to the average moisture ratio of the tracts for the entire material.
    The most common indirect methods for determining the average moisture ratio meant that the electrical resistance of tra was determined. When feeding, pins or punches are inserted into the tract. The resistance, or impedance in cases where the meter uses alternating voltage, which is measured between the pins is a measure of the average moisture ratio of the wire. Other indirect methods use capacitive feeders, electromagnetic fait or near-infrared (NIR) to determine the average moisture ratio.
    An example of a known method for drying hygroscopic material is shown in the document US3721013. It takes a method, for rapid drying of wood, which combines radio frequency or microwave heating with heated air being circulated, in which method the surface temperature of the wood is fed, the wet and dry thermometers temperatures of the circulated heated air in the drying oven are fed , the temperature of the dry thermometer is maintained according to a drying scheme for different types and thicknesses of wood, and in addition the supply of radio frequency or microwave energy and the temperature of the dry thermometer are controlled by the oven to control the surface temperature of the tree according to the dry thermometer temperature of the drying scheme. SUMMARY OF THE INVENTION Despite Undo methods and devices for drying hygroscopic material, there is a need for a new method and device for optimizing the drying process for improved product quality. By improved product quality is meant in this context that undesirable deformations, such as cracking, twisting and cupping, of the hygroscopic material or residual internal stresses in the hygroscopic material are avoided.
    The object of the invention is thus to provide a new method and a new device for optimizing the drying process of hygroscopic material so that undesirable deformations, such as cracking, twisting and cupping, of the hygroscopic material or residual internal stresses in the hygroscopic material are avoided.
    A further object of the present invention is to provide a new method and a new device for optimizing the drying time and / or energy access in relation to the desired product quality.
    A further object of the present invention is to provide a new method and a new device for determining the material night equilibrium moisture ratio.
    These objects are achieved with a method for drying hygroscopic material according to the features of claim 1.
    These objects are also achieved with a device for drying hygroscopic material according to the features set out in claim 12.
    The present invention avoids unwanted energy input, residual internal stresses and unwanted deformations of hygroscopic material. The drying time of hygroscopic material is also optimized and the equilibrium moisture ratio of hygroscopic material is determined to be effective. Further advantages of the invention will become apparent from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS In the following, as an example, a preferred embodiment of the invention is described with reference to the accompanying drawings, in which: Fig. 1 shows a flow chart of a method for drying hygroscopic material according to the present invention, Fig. 2 shows an apparatus for drying hygroscopic material according to the present invention, and Fig. 3 shows a hygroscopic material according to the present invention.
    DETAILED DESCRIPTION OF THE INVENTION Fig. 1 shows a flow chart regarding a method for drying hygroscopic material 2 according to the present invention. The method comprises the following steps and will be described together with Fig. 1 and also together with Fig. 2, which shows a device 1 for drying hygroscopic material 2 according to the invention, and Fig. 3, which shows a hygroscopic material 2 according to the present invention.
    In a first step a, hygroscopic material 2 is supplied in a drying chamber 4 comprising a drying medium 6. In the drying chamber 4, which may be, for example, a chamber dryer or a walking dryer, the climate can be controlled as desired. The drying medium 6 preferably consists of hot air with a controlled equilibrium moisture ratio which is lower than the moisture ratio of the surface of the hygroscopic material 2. The drying medium 6 can also be constituted by some medium other than air, for example a fluid. The hygroscopic material 2 is preferably organic material of biological origin, such as tree, tory and biomass. The invention is particularly suitable for drying troughs in the form of sawn timber having a thickness greater than 8 mm, preferably stone of 10 mm, or in another form, for example veneers having a thickness of less than 8 mm, preferably less and 4 mm. Several parts of hygroscopic material 2, for example trabiters, can be arranged together by irradiation. During irradiation, the strut 8, the said spacer element of thin wood or thin material or other, is arranged between the parts of hygroscopic material 2 so that the drying medium 6 can be transported between the parts of hygroscopic material 2.
    In a second step b, energy is supplied to the drying chamber 4 so that the moisture in the hygroscopic material 2 will escape by displacement. The energy is produced by heating means 10, for example by heating elements of various kinds. The drying medium 6 transports the moisture away from the surface of the hygroscopic material 2. The drying preferably takes place from an average moisture ratio over the fiber feed moisture ratio to an average moisture ratio below the fiber feed moisture ratio, but always takes place from a higher average moisture ratio to a lower average moisture ratio. When drying wood, first remove the water so that the cell cavities are emptied. Then the drying of the cell walls is started. The moisture ratio at which the cell cavities have dried out but the cell cradles are still water-saturated is called the thread's fiber matting moisture ratio. Trd often has a fiber fatigue ratio between about 25% and about 30%.
    In a third step c, continuous or periodic sensing of the dry temperature of the drying medium 2 takes place inside the drying chamber 4 and continuous or periodic output of an output signal for sensing dry temperature. The dry temperature is measured with a first temperature sensing means 12, preferably an ordinary (ton) thermometer, for example a mercury thermometer or a digital thermometer, in one or more places of the drying medium 6. To improve the measurement, the drying medium 6 is kept ventilated around the first temperature sensing body 12.
    In a fourth step d, continuous or periodic sensing of the drying medium 2 water temperature takes place inside the drying chamber 4 and continuous or periodic emission of an output signal for sensed water temperature. The water temperature is measured with a second temperature sensing means 14, where the pulpit body of the second temperature sensing means 14 is wrapped with a constantly moistened material 16, which is hygroscopic, for example cotton or fabric. The feeding takes place in one or more places of the drying medium 6. To improve the feeding, the drying medium 6 is kept ventilated around the second temperature sensing means 14. In a fifth step e the temperature of the surface layer 11 of the hygroscopic material 2 is continuously or periodically sensed and continuously or periodically emitting an output signal for the dissipated temperature. The surface layer 11 is a three-dimensional geometry with a minimum thickness 17. The minimum thickness 17 is less than 2 mm, preferably less than 0.2 mm. The temperature of the surface layer 11 is fed with a third temperature sensing means, preferably a non-contact thermometer 18, i.e. a thermometer which does not touch the form whose temperature it feeds. A non-contact thermometer 18 does not affect the hygroscopic material 2, which leads to more accurate food values if a thermometer that requires contact with the hygroscopic material 2 is used. The supply is carried out in one or more places on the surface layer 11 of the hygroscopic material 2. The non-contact thermometer 18 may be, for example, a pyrometer 18 or an infrared thermometer 18, which has a receiver which receives infrared radiation from a material and then calculates the temperature of the material. The non-contact thermometer 18 preferably has a receiver that senses straining with wavelengths stone of 700 nm, preferably larger than 2.5 μm, as straining with these wavelengths has a minimum penetration depth, which means that the non-contact thermometer 18 feeds the temperature only of the surface layer 11 of the hygroscopic material 2.
    In a sixth step f, the output signal for declining dry temperature, the output signal for declining water temperature and the output signal for declining surface temperature are used for calculating the surface moisture ratio of the hygroscopic material 2 for regulating the properties of the drying medium 6. The properties of the drying medium 6 are its temperature and water content. The temperature of the drying medium 6 is regulated by supplying energy to the drying chamber 4. The water content of the drying medium 6 is regulated by basing, i.e. supply of moisture to the drying chamber 4. Since the dry temperature, water temperature and surface temperature are sensed continuously or periodically and the output signals for these sensed temperatures are given continuously or periodically. the calculation of the surface moisture ratio of the hygroscopic material 2 is changed continuously or periodically. The difference between the dry and the wet temperature is called the psychrometer difference and is a measure of the relative humidity. The relative humidity indicates the proportion of water vapor in relation to the maximum possible amount of water vapor at the current temperature and current pressure. The water temperature is always equal to or lower than the dry temperature, depending on how much moisture the surrounding drying medium 6 comprises. When water from the hygroscopic material 2 evaporates, heat energy and temperature drop. This persists until an equilibrium arises between the absorbed heat energy from the drying medium 6 and the energy input for the evaporation of the water. At the beginning of the drying process, the surface of the hygroscopic material 2, if its surface is matted with moisture, retains the wet temperature. As drying takes place, the hygroscopic material 2 assumes more and more the dry temperature. When the surface area of the hygroscopic material 2 night equilibrium moisture ratio, the surface has a temperature equal to the dry temperature of the drying medium 6. The surface temperature is thus in relation to the dry and water temperatures a matt on the surface moisture ratio. By creating an xy diagram with a temperature indicated on one axis and time on the other axis and supplying the measured values of the surface temperature of the hygroscopic material 2 and the dry temperature of the drying medium 6 at different times to the xy diagram, it is possible to use estimate the surface temperature curve of the hygroscopic material when the surface temperature curve reaches the temperature of the drying medium 6. This estimate is that the end of the drying process can be predicted before it has taken place, which makes it possible to control the drying process with stone accuracy. The surface moisture ratio gives an indication of the rate at which the water evaporates from the surface of the hygroscopic material 2. The supply of energy is regulated to ensure that the evaporation rate of the surface of the hygroscopic material 2 inside the drying chamber 4 is kept below a predetermined maximum. Thus, undesirable deformations, such as cracking, twisting and cupping, of the hygroscopic material 2 or residual internal stresses in the hygroscopic material 2 can be avoided. The surface moisture ratio of the hygroscopic material 2 can also be different to optimize the drying time in relation to the desired product quality and to determine whether the hygroscopic material 2 has a night equilibrium moisture ratio.
    While the hygroscopic material 2 is being dried, water is moved from the interior of the hygroscopic material 2 to the surface of the hygroscopic material 2 and is then transported to the drying medium 6 which passes the surface of the hygroscopic material 2. The water in the surface of the hygroscopic material 2 evaporates only if the moisture ratio of the surface of the hygroscopic material 2 is higher than the equilibrium moisture ratio of the hygroscopic material 2 in the drying medium 6. As long as the water moves through the surface of the hygroscopic material 2 to the drying medium 6, want to say as long as drying takes place, the moisture ratio of the surface of the hygroscopic material 2 is higher than the equilibrium moisture ratio of the drying medium 6. When no more water moves from the interior of the hygroscopic material 2 to the surface of the hygroscopic material 2, i.e. when drying has ceased and there is no flake moisture ratio gradient in the hygroscopic material 2 longer, the moisture ratio of the surface of the hygroscopic material 2 is equal with the drying medium's 6 equilibrium moisture ratio.
    By creating an xy diagram with moisture ratio indicated on one axis and time on the other axis and entering the measured values for the surface moisture ratio of the hygroscopic material 2 and the equilibrium moisture ratio of the drying medium 6 at different times in the xy diagram surface moisture ratio at night the equilibrium moisture ratio of the drying medium 6, to estimate with the aid of the surface moisture ratio curve of the hygroscopic material 2 when the surface moisture ratio curve of the hygroscopic material 2 reaches the equilibrium moisture ratio of the drying medium 6. This estimate thus means that the end of the drying process can be predicted before it has taken place, which makes it possible to control the drying process with greater accuracy. Tra always holds a certain amount of water bound in the cell walls. This water is directly related partly to the temperature of the surrounding air but above all to the relative humidity. The moisture ratio that the tree strives to ingest with regard to the temperature and relative humidity of the air is called the equilibrium moisture ratio and is also stated as a percentage of the dry weight. If the wood is more moist than the equilibrium moisture ratio, the wood will release water to the surrounding air and also shrink. The tree absorbs moisture from the surrounding air and swells if the tree's moisture content is lower than the radiating equilibrium moisture content. Wood that is built into constructions should therefore have a moisture ratio that is as close as possible to the equilibrium moisture ratio in the finished construction in order to avoid moisture movements.
    In a seventh step g, the flow rate and river direction of the drying medium 6 are regulated. The flow rate and river direction of the drying medium 6 can be fed with a river feeder 24. To increase the energy supply to the hygroscopic material 2, the speed and / or temperature of the drying medium 6 can be increased and to decrease the energy supply to the hygroscopic material 2, the speed and / or temperature of the drying medium 6 can be increased. . Circulation of the drying medium 6 takes place with the aid of ventilation means 20. The ventilation means 20 are driven by a motor 21 and can vary the flow direction of the drying medium 6 by reversing, i.e. changing the direction of rotation. Reversal of the drying medium 6 is advantageous in drying. If the reversing of the drying medium 6 does not take place, the hygroscopic material 2 hit by the drying medium 6 dries faster than the hygroscopic material 2 hit by the drying medium 6 last.
    In an eighth step h, drying medium 6 is replaced. If the surrounding drying medium 6 is dry, it can absorb more water vapor from the hygroscopic material 2 in relation to whether the drying medium 6 is moist at the same temperature. If the drying medium 6 is matted with water, that is to say if the relative humidity is 100%, the drying medium 6 cannot absorb any moisture at all. It is important to replace the moist drying medium 6 around the hygroscopic material 2 with a new dry drying medium 6 in order for the drying to continue. The drying medium 6 is removed from the drying chamber 4 through at least one ventilation opening 25 and new drying medium 6 is supplied to the drying chamber 4 through at least one ventilation opening 25. The drying medium 6 can also. is drained from the drying chamber 4 and dehumidified, for example by condensing drying, to then be re-introduced into the drying chamber 4.
    The device 1 according to the invention comprises, as mentioned above, a drying chamber 4 for accommodating hygroscopic material 2 and a drying medium 6 and heating means 10 for supplying energy to the drying chamber 4. The drying chamber 4 may for instance be a chamber dryer or traveling dryer. The hygroscopic material 2 is preferably organic material of biological origin, such as tree, tory and biomass. The device is particularly suitable for drying troughs in the form of sawn timber having a thickness greater than 8 mm, preferably stone of 10 mm, or in another form, for example veneers having a thickness less than 8 mm, preferably less and 4 mm. Several parts of hygroscopic material 2, for example trabiters, can be arranged together by irradiation. When laying straws, straws 8, i.e. spacer elements of thin wood or other thin material, are arranged between the parts of hygroscopic material 2 so that the drying medium 6 can be transported between the parts of hygroscopic material 2.
    The heating means 10 are, for example, heating elements of various kinds. The drying medium 6 transports the moisture away from the surface of the hygroscopic material 2 and is preferably hot air with a controlled equilibrium moisture ratio which is lower than the moisture ratio of the surface of the hygroscopic material 2. The drying preferably takes place from an average moisture ratio above the fiber saturation moisture ratio to an average moisture ratio below the fiber saturation moisture ratio, but always takes place from a higher average moisture ratio to a lower average moisture ratio. When drying the wire away & first the water so that the cell cavities are emptied. Then the drying of the cell rocks is started. The moisture ratio at which the cell cavities have dried out but the cell cradles are still water-saturated is called the thread's fiber matting moisture ratio.
    Furthermore, the device 1 comprises first temperature sensing means 12 for sensing the dry temperature of the drying medium 6 inside the drying chamber 4 and emitting an output signal for sensing dry temperature, second temperature sensing means 14 for sensing the water temperature of the drying medium 6 inside the drying chamber 4 and emitting a third temperature sensing water temperature, means 18 for sensing the surface temperature of the hygroscopic material 2 and emitting an output signal for sensing surface temperature.
    The first temperature sensing means 12 is preferably an ordinary (ton) thermometer, for example a mercury thermometer or a digital thermometer. The first temperature sensing means 12 continuously or periodically takes out the supply at one or more places of the drying medium 6. To improve the supply, the drying medium 6 is kept ventilated around the first temperature sensing means 12.
    The pulpit body of the second temperature sensing member 14 is wrapped with a constantly moistened material 16, for example cotton or fabric. The feeding takes place continuously or periodically in one or more places of the drying medium 6. In order to improve the feeding, the drying medium 6 is kept ventilated around the second temperature sensing means 14. As previously mentioned above, the third temperature sensing means 18 is preferably a non-contact thermometer, i.e. a thermometer which does not touch the form whose temperature it feeds. The feed is performed on. one or more places on the surface layer 11 of the hygroscopic material 2. The surface layer 11 is a three-dimensional geometry, which has a minimum thickness 17. The non-contact thermometer 18 does not affect the hygroscopic material 2, which leads to a more precise food value than a thermometer which requires contact with the hygroscopic material 2 used. As mentioned, the non-contact thermometer 18 can be, for example, an infrared thermometer or a pyrometer.
    The device 1 also comprises a control unit 22, which receives the output signal for remote dry temperature, the output signal for remote water temperature and the output signal for remote surface temperature through a signal line 23 or a wireless construction. The control unit 22 then calculates the surface moisture ratio of the hygroscopic material 2 and regulates the properties of the drying medium 6. The properties of the drying medium 6 are its temperature and water content. The temperature of the drying medium 6 is regulated by supplying energy to the drying chamber 4. The water content of the drying medium 6 is regulated by basing, i.e. the supply of moisture to the drying chamber 4. The supply of moisture to the drying chamber 4 takes place by means of a basing device 26. DA the dry temperature, water temperature and the surface temperature is sensed continuously or periodically, the calculation of the surface moisture ratio of the hygroscopic material 2 can be done continuously or periodically. At the beginning of the drying process, the surface of the hygroscopic material 2, if its surface is matted with moisture, acquires the water temperature. As drying takes place, the hygroscopic material 2 assumes more and more the dry temperature. When the surface area of the hygroscopic material 2 night equilibrium moisture ratio, the surface has a temperature equal to the dry temperature. The surface temperature is thus in relation to the dry and water temperatures a measure of the surface moisture ratio.
    The surface moisture ratio gives an indication of the rate at which the water evaporates from the surface of the hygroscopic material 2. The flow of energy is regulated to ensure that the evaporation rate of the surface of the hygroscopic material 2 inside the drying chamber 4 is kept below a predetermined maximum. PA sa. Thus, undesirable deformations, such as cracking, twisting and cupping, of the hygroscopic material 2 or residual internal stresses in the hygroscopic material 2 can be avoided. The evaporation rate of the water from the hygroscopic material 2 can also be used to optimize the drying time and / or the energy input in relation to the desired product quality and to determine whether the hygroscopic material 2 has the equilibrium moisture ratio at night.
    Furthermore, the present invention comprises ventilation means 20 for regulating the flow rate and flow direction of the drying medium 6. The flow rate and flow direction of the drying medium 6 can be fed with a flow meter 24. The ventilation means 20 are driven by a motor 21. In order to increase the energy supply to the hygroscopic material 2, the speed and / or temperature of the drying medium 6 can be increased and to slow down the energy supply to the hygroscopic material 2. 6 speed and / or temperature is collected.
    The ventilation means 20 varies the river direction of the drying medium 6 by reversing, i.e. changing the direction of rotation. Reversal of the drying medium 6 is advantageous when drying. If no reversal of the drying medium 6 takes place, the hygroscopic material 2 hit by the drying medium 6 dries faster than the hygroscopic material 2 hit by the drying medium 6 last.
    The ventilation means 20 can awn replace the drying medium 6. If the surrounding drying medium 6 is dry, it can absorb more water vapor from the hygroscopic material 2 in relation to whether the drying medium 6 is moist at the same temperature. If the drying medium 6 is saturated with water, ie if the relative humidity is 100%, the drying medium 6 cannot absorb any moisture ails. It is important to replace the moist drying medium 6 around the hygroscopic material 2 with a new dry drying medium 6 in order for the drying to continue. The drying medium 6 is drained from the drying chamber 4 through at least one ventilation opening 25 and new drying medium 6 is supplied to the drying chamber 4. The drying medium 6 can also be drained from the drying chamber 4 and dehumidified, for example by condensing drying, to be re-introduced into the drying chamber 4. 13
    权利要求:
    Claims (22)
    [1]
    1. supply of hygroscopic material (2) in a drying chamber (4) comprising a drying medium (6), 2. supply of energy to the drying chamber (4), 3. sensing the dry temperature of the drying medium (6) inside the drying chamber (4) and releasing an output signal for sensing dry temperature, 4. sensing the water temperature of the drying medium (6) inside the drying chamber (4) and emitting an output signal for sensing water temperature, 5. sensing the temperature of the surface layer (11) of the hygroscopic material (2) and emitting an output signal for defrost surface temperature, can be drawn from the step: using the output signal for defrost dry temperature, the output signal for defrost water temperature and the output signal for defrost surface temperature for calculating the surface moisture ratio of the hygroscopic material (2) for regulating the drying medium (6) properties.
    [2]
    The method according to claim 1, characterized in that the properties of the drying medium (6) are its temperature and water content.
    [3]
    The method according to claim 1 or 2, characterized by the further step: g) regulating the flow rate and river direction of the drying medium (6)
    [4]
    The method according to any one of the preceding claims, characterized by the further step: h) replacement of the drying medium (6).
    [5]
    The method according to any one of the preceding claims, characterized in that the drying of hygroscopic material (2) takes place from a surface moisture ratio of stone to the fiber saturation moisture ratio to a surface moisture ratio smaller than the fiber matting moisture ratio.
    [6]
    The method according to any one of the preceding claims, characterized in that the hygroscopic material (2) is tra, tory or biomass. 14
    [7]
    The method according to any one of the preceding claims, characterized in that the thickness of the hygroscopic material (2) is stone of 8 mm, preferably stone of 10 mm.
    [8]
    The method according to any one of claims 1-6, characterized in that the thickness of the hygroscopic material (2) is less than 8 mm, preferably less than 4 mm.
    [9]
    The method according to any one of the preceding claims, characterized in that the sensing of the surface temperature of the hygroscopic material (2) is carried out by means of an infrared thermometer (18) or a pyrometer (18). 10
    [10]
    The method according to claim 9, characterized in that the infrared thermometer (18) has a receiver which senses straining with wavelengths of stone at 700 nm, preferably stone at 2.5 μm.
    [11]
    The method according to any one of the preceding claims, characterized in that the drying medium (6) is air.
    [12]
    Device for drying hygroscopic material (2), comprising a drying chamber (4) for containing hygroscopic material (2) and a drying medium (6), heating means (10) for supplying energy to the drying chamber (4), first temperature sensing means (12) for sensing the dry temperature of the drying medium (6) inside the drying chamber (4) and emitting an output signal for sensing dry temperature, other temperature sensing means (14) for sensing the water temperature of the drying medium (6) inside the drying chamber (4) and emitting of an output signal for sensing water temperature, a third temperature sensing means (18) for sensing the temperature of the surface layer (11) of the hygroscopic material (2) and outputting an output signal for sensing surface temperature, which can be marked by a control unit (22), which receives the output temperature for the output dry temperature, the output signal for the output water temperature and the output signal for the output surface temperature, and which control unit (22), with the aid of received signals, calculates the surface moisture ratio of the hygroscope the material (2) and regulates the properties of the drying medium (6).
    [13]
    The device according to claim 12, characterized in that the properties of the drying medium (6) are its temperature and water content.
    [14]
    The device according to claim 12 or 13, characterized in that it further comprises ventilation means (20) for controlling the flow rate and flow direction of the drying medium (6).
    [15]
    The device according to any one of claims 12-14, characterized in that the drying chamber (4) comprises at least one ventilation opening (25) for replacing the drying medium (6). 10
    [16]
    The device according to any one of claims 12-15, characterized in that the drying of hygroscopic material (2) takes place from a surface moisture ratio of less than the fiber moisture content ratio to a surface moisture ratio less than the fiber feed moisture ratio.
    [17]
    The device according to any one of claims 12-16, characterized in that the hygroscopic material (2) is tra, tory or biomass.
    [18]
    The device according to any one of claims 12-17, characterized in that the thickness of the hygroscopic material (2) is stone of 8 mm, preferably stone of 10 mm.
    [19]
    The device according to any one of claims 12-17, characterized in that the thickness of the hygroscopic material (2) is less than 8 mm, preferably less than 4 mm.
    [20]
    The device according to any one of claims 12-19, characterized in that the third temperature sensing means (18) is an infrared thermometer or a pyrometer.
    [21]
    The device according to claim 20, characterized in that the infrared thermometer (18) has a receiver which senses straining with wavelengths of stone at 700 nm, preferably stone at 2.5 μm.
    [22]
    The device according to any one of claims 12-21, characterized in that the drying medium (6) is air.
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    同族专利:
    公开号 | 公开日
    EP2959247A4|2016-10-19|
    WO2014129957A1|2014-08-28|
    SE537826C2|2015-10-27|
    EP2959247A1|2015-12-30|
    PL2959247T3|2020-09-07|
    EP2959247B1|2019-11-13|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3350789A|1966-11-23|1967-11-07|Crown Zellerbach Canada Ltd|Method of determining the moisture content of thin porous materials|
    US3721013A|1971-06-04|1973-03-20|Canadian Patents Dev|Method of drying wood|
    CA1189192A|1984-03-14|1985-06-18|Michael R. Clarke|Method and apparatus for rapidly determining themoisture content of a substance|
    FI79198C|1986-02-24|1989-11-10|Valtion Teknillinen|Method and apparatus for measuring and controlling the moisture content of the drying air in a drying machine for textile materials.|
    DE3639929A1|1986-11-22|1988-06-01|Babcock Bsh Ag|CONTINUOUS DRYER FOR VENEER BLADES|
    AUPP808499A0|1999-01-11|1999-02-04|Microwave Processing Technologies Pty Limited|A method and apparatus for microwave processing of planar materials|SE538180C2|2013-11-18|2016-03-29|Coldbay Ab|Method and system for drying wood in a drying room|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1350208A|SE537826C2|2013-02-21|2013-02-21|Method of drying hygroscopic material and apparatus for drying hygroscopic material.|SE1350208A| SE537826C2|2013-02-21|2013-02-21|Method of drying hygroscopic material and apparatus for drying hygroscopic material.|
    EP14753723.7A| EP2959247B1|2013-02-21|2014-02-13|Method for drying hygroscopic material and apparatus for drying hygroscopic material|
    PCT/SE2014/050175| WO2014129957A1|2013-02-21|2014-02-13|Method for drying hygroscopic material and apparatus for drying hygroscopic material|
    PL14753723T| PL2959247T3|2013-02-21|2014-02-13|Method for drying hygroscopic material and apparatus for drying hygroscopic material|
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