• 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:
    The invention relates to a device for preheating a recycled pulp to be dispersed, to which - a channel-like frame (12) delimiting in its inner part a volume (14) for the recycled pulp (16) is assigned, - heaters (18) for heating the Recycled fiber pulp (16) associated with steam, - a conveyor screw (21) for conveying the recycled pulp (16) forward and for forming a pulp closure (26) for preventing the outflow of steam is assigned, - inside the frame ( 12) arranged mixing devices (20) in the running direction of the recycled pulp (16) after the screw conveyor (24) are assigned to the mixing devices (20) has an axis (22) of the frame in the longitudinal direction and on the axis (22) arranged wing elements ( 23) are assigned to disassemble the fiber bundles of recycled pulp (16) and their further promotion. The screw conveyor (24) is arranged coaxially with the mixing devices (20).
    公开号:AT516780A2
    申请号:T50040/2016
    申请日:2016-01-26
    公开日:2016-08-15
    发明作者:
    申请人:Valmet Technologies Inc；
    IPC主号:
    专利说明:

    Device for preheating a recycling to be dispersed
    pulp
    The invention relates to a device for preheating a recycling pulp to be dispersed, which is associated with a in its inner part a volume for the recycling pulp limiting channel-like frame, heaters are assigned for heating the located inside the frame recycled fiber pulp with steam, a screw conveyor associated with conveying the recycled pulp forward and forming a pulp closure to prevent the vapor mass from escaping, mixing means arranged in the interior of the frame in the direction of recycling pulp downstream of the auger for mixing the recycled pulp and for intensifying the heating are provided a
    Axle of the frame in the longitudinal direction and arranged on the axis wing elements for disassembling the fiber bundles of recycled pulp and their further promotion are assigned, in which device said screw conveyor is arranged coaxially with the mixing devices.
    If recycled fibers are used in the manufacture of paper or cardboard, impurities must be cleaned from the recycled fibers. Contaminants may be various sizing agents, waxes, printing inks, coating agents and other components which may interfere with the production of a new fibrous web. For the purification, dispersion is carried out for the recycled pulp, the impurities being released from the recycling fibers for the post-dispersion flotation phase intended to trap the impurities.
    In general, three phases are assigned to the dispersion process, namely the thickening phase, the heating phase and the dispersion phase. It is the task of the thickening phase to dewater the recycled pulp for heating. The task of the heating phase is to raise the temperature of the recycled pulp to facilitate the dissolution of contaminants, and the task of the dispersion phase is to mechanically remove contaminants from the recycled pulp for flotation. The thickening phase is generally carried out with the aid of a thickening screw and the dispersion in a disperser. The system works independently in each phase and requires independent control and independent drive. In addition, especially the preheating system is also assigned a separate cone plug, which has prevented the escape of steam from the preheater. Due to several separate devices, the problem of a prior art device to be used for dispersion is its costly and expensive construction, which also requires a considerable amount of space.
    The object of the invention is to bring about a simpler and smaller space requirement device for preheating the recycled pulp. The characterizing features of this invention can be taken from the enclosed patent claim 1.
    The object of the device according to the invention can be achieved for preheating the to be dispersed on the device recycled pulp, which on its inside a volume for the recycling pulp limiting channel-like frame, Fleizvorrichtungen for heating the recycled pulp located within the frame with steam and a feed screw for conveying the recycled pulp forward and for forming a pulp stop preventing the escape of the steam. In addition, the apparatus has mixing devices arranged in the interior of the frame in the direction of the recycling pulp downstream of the conveyor for mixing the recycled pulp and for intensifying the heating, wherein the mixing devices have an axis of the frame in the longitudinal direction and on the axis arranged wing elements for dissolving the Fiber bundles of recycled pulp and assigned to their further promotion. The screw conveyor is arranged coaxially with the mixing devices. Coaxially arranged, the recycling pulp conveying and compacting unit formed from the mixing devices is considerably more compact than the devices of the prior art and so they are also easier to arrange. In addition, the auger may be fabricated as an integral part of the apparatus, wherein the auger and mixers may be located within the unitary frame while conveying the recycle furnish in the same direction. Thus, the structure of the device is easier and takes up less space in the lateral and vertical direction to complete. In this context, the coaxiality is understood to mean, in the longitudinal direction of the axis, successive construction of the mixing devices and not in the radial direction of the axis successive structure.
    Preferably, the screw conveyor is arranged in the inner part of the frame. Thus, the same frame can be used for both the screw conveyor and the mixing devices.
    Preferably, the screw conveyor is arranged coaxially with the mixing devices on the same axis. Arranged on the same active axis, both the mixing devices and the feed screw may have a common drive, a common axis support and a common control, the device being much simpler and cheaper to manufacture than the prior art devices.
    Preferably, the screw conveyor is integrated in the device. Thus, a uniform frame can be used in the proportion of the screw conveyor and the mixing devices, which is cheaper to manufacture.
    The auger is associated with a thread-free region for forming a recycled pulp closure to prevent the escape of heat between the spiral-shaped regions. With the aid of a thread-free region, the recycled pulp is accumulated in the screw conveyor as a recycling cross-section-plug recycling pulp closure which prevents the steam preferably supplied by the heaters from escaping from the inner part of the frame. With the help of the thread-free area, the use of a conventional conical closure in connection with the device provided for the preheating can be avoided. The unthreaded area is between the spiral areas.
    Preferably, the screw conveyor has a two-headed or two-threaded thread and a second separate thread with respect to the first thread, of which the first thread in the screw conveyor is in front of the unthreaded region and the second thread after the unthreaded region in the machine direction of recycled pulp. The task of the first thread is to feed the recycled pulp in the auger forward into the unthreaded area of the auger. In turn, the second thread effectively disengages from the unthreaded region the recycled fiber web seal that precedes the second thread prior to running on the mixers.
    The second thread can be denser from its thread or have a smaller pitch than the first thread. Thanks to the denser thread, the second thread effectively loosens the fabric closure and its conveying capacity is greater than that of the first thread.
    The frame may have a first diameter along the length of the screw conveyor and a second diameter along the length of the mixing devices. Thus, the correct peripheral speed is achieved for the mixing devices, which are located on the same axis and operated with the same drive, for the dissolution and agitation of the recycled pulp.
    The second diameter is preferably larger than the first diameter. The second diameter may be at least 30%, preferably at least 50% larger than the first diameter. The capacity of the feed screw and the mixing devices are properly adjusted with respect to each other.
    Preferably, the diameter of the feed screw is almost the same size as the inner diameter of the frame along the path of the feed screw, with the feed screw effectively conveying the recycled pulp forward.
    In one embodiment, the axle is cone-shaped on the track and widens in the direction of the feeders. By means of a cone-shaped screw conveyor, the compression effect of the screw conveyor can be improved and it can be better prevented that the steam escapes from the area of the mixing devices. In other words, the cone-like axis may function as an addition to the unthreaded portion of the auger, as a recycle compacting agent for the recycle.
    The heating devices preferably include steam nozzles arranged in the frame along the length of the mixing devices, which are preferably arranged in the forward flow, ie in the direction of the outlet opening, with respect to the direction of rotation of the mixing devices. Located in the forward flow, the steam pipes are effective and they favor the increase in the temperature of the recycled pulp.
    Preferably, the steam nozzles are directed tangentially with respect to the direction of rotation of the mixing devices. Tangentially arranged, the steam pipes are less subject to clogging and provide effective heat transfer from the steam to the recycled pulp.
    The mixing devices are preferably assigned a drive for rotating the axle.
    Specifically, it is characteristic of the device according to the invention that the conveyor screw is arranged coaxially with the mixing devices.
    With the help of the device according to the invention a simpler structure than in devices according to the prior art is achieved, which is easier to mount in the installation and its space requirement is lower. The device according to the invention also has fewer built-in parts as compared with the prior art devices, since both the screw conveyor and the mixing devices are driven and controlled together, requiring only one drive and one control. In addition, thanks to its simple construction, it is easy to maintain the device according to the invention.
    In the following, the invention will be described in detail with reference to the accompanying drawings, which illustrate some embodiments of the invention, in which:
    FIG. 1 is a side view of a principal drawing showing the device according to the invention as part of the dispersion process; FIG.
    2a shows a schematic diagram of the device according to the invention from the side as a sectional view,
    2b shows the sectional view of Fig. 2a with recycled pulp,
    Fig. 3 shows the axonometric sectional view of the device according to the invention.
    The device 10 according to the invention according to FIG. 1 is part of the dispersion process and is arranged in the process between a thickening screw 100 and a disperser 200. The object of the device 10 is to heat the recycling pulp flowing to the disperser from about 20.degree. C. to about 100.degree. C. and even to 120.degree. C. for dissolving contaminants in recycled fibers. When talking about recycled pulp in this context, preference is given to the OCC and DIP recycling fibers. The device according to the invention can also be called a preheater.
    The apparatus 10 according to FIG. 1 is a frame 12 which limits the volume 14 in its interior for the recycled pulp of FIG. 2b
    Heaters 18, a screw conveyor 24 and mixing devices 20 associated. The mixing devices 20 are associated with an axis 22 of the frame 12 in the longitudinal direction and arranged on the axis wing elements 23 for dissolving and forward conveying the recycled pulp 16 and preferably a drive 21 for rotating the axle 22. The screw conveyor 24 is arranged coaxially with the mixing devices 20. Preferably, the channel-like frame 12, two different, having an inner diameter parts associated, of which the first diameter 38 on the length of the screw conveyor 24 and the second diameter 40 on the length of the mixing devices 20 is located.
    As shown in FIGS. 2a and 2b, the recycle pulp 24 is preferably fed by gravity to the feed screw 24 through a supply port 48 disposed on the frame. The feed may also be mechanically supported, for example, from the side of the frame. The consistency of recycled pulp flowing from the thickening screw 100 is about 20-30%, that is, 20-30% by volume of recycled pulp. The screw conveyor 24 is preferably rotated by means of the drive 21 connected to the end of the shaft 22 common to the mixing devices 20 and the screw conveyor 24, the conveyor screw 24 conveying the recycled pulp 16 in the direction of the mixing devices 20. Preferably, the auger 24 are associated with two separate threads, of which the first thread 24 is arranged so that it runs in the longitudinal direction of the screw conveyor 24 at least over the distance of the entire feed opening 48. Further, the screw conveyor 24 is associated with a spiral-free area, which follows the first thread 34 in the longitudinal direction 24 of the screw conveyor 24. The length of the spiral-free region 30 of the screw conveyor 24 is 25-200% of the average or diameter of the screw conveyor. The first thread 34 conveys the recycled pulp 16 at the location of the feed opening 48 in the direction of the mixing devices 20, wherein the recycled pulp 16 enters the spiral-free area 30 of the screw conveyor 24. Because in the spiral-free region 30, the recycled pulp 16 is conveyed forward only by the recycling fiber 16 flowing from the first thread 34, a recycled pulp closure 26 is formed at the location of the spiral-free region 30, which at the location of the spiral-free region 30 the auger 24 completely fills the area between the auger 24 and the frame 12. The recycled pulp closure is airtight and the steam to be supplied to the area of the mixers 20 by means of the heaters 18 can not penetrate the recycled pulp closure. Outside the spiral-free region of the screw conveyor 30 along the length of the first thread 34 and the second thread 36, the degree of filling of the screw conveyor 24 is approximately 50%.
    The first thread 34 continuously conveys the recycled pulp 16 forward and simultaneously also the recycled pulp closure located in the spiral-free region 30, toward the second thread 36. The second thread 36 releases the recycled pulp closure from the other end and conveys When the conveyor screw 24 is off, the recycled pulp 16 preferably passes to a portion of the frame 12 of the larger second diameter 40 where it is mounted on the axis 22 of the mixers 20 Wing elements 23 dissolve the recycled pulp 16 into smaller parts. At the same time 12 steam is supplied to the inner part of the frame by means of the heaters 18. Under the effect of heating and mechanical strokes, the recycled pulp is dissolved and at the same time the impurities are released from the surface of the recycled fibers.
    The mixing devices 20 are preferably associated with wing elements 23 of three different types. The immediately after the auger 24 arranged vane elements 23 are denser arranged in the corner straight blades or knives 46, the smaller of the conveyor screw 24 recycled pulp 16 smaller than fiber bundles, so as lumps dissolve. This part of the mixing devices 20 may be referred to as a dissolution zone. Preferably, on the dissolution zone on the inner surface of the frame 12, counter knives 58 are mounted to enhance the dissolution process. After the dissolution zone, the recycled pulp 16 is conveyed to the conveying zone, where not so densely rising sheets 44 are arranged, whose purpose is to shake up the recycled pulp 16 and to convey the recycled pulp 16 forward. The purpose of Aufschütteins is to keep the recycled fiber loose, the surface of the recycled fiber is as large as possible for heat transfer. The conveyor zone are also in addition to the sparsely arranged leaves 44 also assigned to these arranged rods 52, the task of which is to dissolve the remaining recycled pulp flakes before the expiration of the recycled pulp from the device 10.
    With respect to the feed opening 48 of the frame 12, the drain end 50 is preferably associated with the opposite end, into which the pulp is incident. The outlet opening 50 and the subsequent channel 64 are connected to the disperser 200 of FIG.
    The drainage aperture may be located on the side of the frame, but then the channel behind the drainage aperture should have mechanical auxiliary devices or a highly downwardly sloping channel for discharging the recycled pulp from the equipment 10.
    According to FIGS. 2 and 3, the mixing devices 20 may additionally be associated with blades 54 arranged at the opposite end with respect to the conveying screw 24 of the mixing devices 20. More specifically, wide blades 54 are disposed after the drain port 50, stopping the recycled pulp 16 flowing further in the frame 12 if the drain port is temporarily blocked by arching action. The broad leaves may also be a little rising, but the climbing direction is the opposite direction of the direction of recycling pulp.
    According to FIG. 2, the heating elements 18 can be assigned steam stubs 42 through which the steam is supplied to the interior of the frame 12 for heating the recycled pulp 16. The steam nozzles 42 are preferably arranged so that they are aligned tangentially and in accordance with the direction of rotation of the mixing devices. The steam is evenly distributed in the recycled pulp and the steam pipes remain open better. Due to this and the better mixing of the mixing devices, the consumption of the steam used in the heating in kg / mass tn can be reduced as compared to the devices according to the prior art. The pressure of the steam supplied by the heaters may be less than 1 bar. According to FIGS. 2 and 3, additional heating stubs 56 can be arranged in connection with the drain opening 50 or thereafter, with the aid of which the recycling pulp flowing away from the device 10 is further heated to a higher temperature, in particular for the DIP recycling fibers can be. The steam may be supplied to the jacket of the channel downstream of the drain opening 50, from where the steam is conveyed into the recycled pulp via the perforation of the inner perforated plate.
    The dimensions of the device according to the invention can vary considerably depending on the capacity required for the device. The aggregated length of the screw conveyor and the mixing devices of a plant with 100 - 600 tn capacity / 24h can be 3 - 6 m, while the diameter of the frame is 100 - 2000 mm.
    Of the threads of the screw conveyor, the second thread 36 is preferably denser with respect to the thread or has a smaller pitch than the first thread 34. The second thread limits the run of the recycled fiber in the screw conveyor and effectively dissolves the recycling Fibrous closure even before the arrival of recycled pulp on the mixing devices. According to Fig. 2a so the auger 24 is associated with a two-headed or two sections having threaded 32. Referring to FIG. 1, the axis 22 may be tapered along the length of the auger 24 such that the diameter of the axis increases toward the mixing devices 20. With the help of such an axle construction, the formation of the recycled pulp closure in the auger 24 can be promoted. The conical part of the axis may be at an angle of 2-15 ° with respect to the floor. With the help of the escape of the steam effectively preventing recycling pulp closure, the supply of steam can be optimi optimized, the capacity of the heaters must not be oversized.
    According to the invention, the screw conveyor 24 is arranged coaxially with the mixing devices 20. Preferably, both the screw conveyor 24 and the mixing devices 20 are arranged on a common axis 22, which is supported only at their ends 60 and 62 as shown in FIG. The axle 22 may be sealed with a bush or a seal provided for the purpose. The drive 21 of the axis 22 is preferably arranged according to FIG. 1 at the end 62 of the device 10 on the side of the mixing devices. The drive may be associated with a normal electric motor controlled by a frequency converter. The device can be arranged entirely on a tubular frame, so that it is easy to transport for installation and maintenance.
    The frame and other parts of the device according to the invention used in the device can be made, for example, of acid-proof steel or of another material suitable for the purpose of use.
    权利要求:
    Claims (9)
    [1]
    claims
    An apparatus for preheating a recycled pulp to be dispersed, which is associated with a channel-like frame (12) bounding a volume (14) for the recycled pulp (16), heaters (18) for heating within the frame (12 ) associated with recycled fibrous pulp (16) are associated with steam, a screw conveyor (21) for conveying the recycled pulp (16) forward and forming a pulp closure (26) for preventing the outflow of steam is associated, inside the frame ( 12) arranged mixing devices (20) in the direction of said recycled pulp (16) after the screw conveyor (24) for mixing the recycled pulp (16) and for intensifying the heating is associated with the mixing devices (20) has an axis (22 ) of the frame in the longitudinal direction and on the axis (22) arranged wing elements (23) for disassembling the fiber bundles of said recycled pulp (16) and i In which device the screw conveyor (24) is arranged coaxially with the mixing devices (20), characterized in that the screw conveyor (24) has a spiral-free region (30) for forming a recycled pulp closure (26) for preventing the Escaping the heat between the spiral areas (34,36) is assigned.
    [2]
    2. Apparatus according to claim 1, characterized in that the screw conveyor (24) is coaxial with the mixing devices (20) on the same axis (22).
    [3]
    3. Apparatus according to claim 1 or 2, characterized in that the screw conveyor (24) is associated with a two-headed thread (32) having a first second thread (34) and with respect to the first thread (34) has a separate second thread (36 ), of which the first thread (34) is in the screw conveyor (24) in front of the spiral-free region (30) and the second thread (36) is after the spiral-free region (30) in the direction of recycling of the recycled fiber.
    [4]
    4. Apparatus according to claim 3, characterized in that said second thread (36) has a smaller pitch than said first thread (34).
    [5]
    5. Device according to one of claims 1 - 4, characterized in that the frame (12) has a first diameter (38) along the length of the screw conveyor (24) and a second diameter (40) along the length of the mixing devices (20) ,
    [6]
    6. Device according to one of claims 1-6, characterized in that the second diameter (40) is greater than the mentioned first diameter (38), wherein the second diameter (40) preferably at least 30%, preferably at least 50% greater than the first diameter (38) is.
    [7]
    7. Device according to one of claims 1-6, characterized in that the axis (22) along the length of the screw conveyor (24) is tapered in width increasingly in the direction of the mixing devices (20).
    [8]
    8. Device according to one of claims 1-7, characterized in that the heaters (18) on the length of the mixing devices (20) on the frame (12) arranged steam pipe (42) are associated, which with respect to the direction of rotation of the mixing devices ( 20) are arranged in the forward flow.
    [9]
    9. Apparatus according to claim 8, characterized in that the mentioned steam pipe (42) are aligned tangentially with respect to the direction of rotation of the mixing devices (20).
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    同族专利:
    公开号 | 公开日
    DE102016101214A1|2016-08-11|
    AT516780A3|2018-06-15|
    CN105862480B|2017-07-18|
    FI125635B|2015-12-31|
    AT516780B1|2018-06-15|
    CN105862480A|2016-08-17|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
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    GB1429626A|1972-03-25|1976-03-24|Watford Eng Ltd|Bulk material processing apparatus|
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    DE19845513A1|1998-10-02|2000-04-06|Voith Sulzer Papiertech Patent|For the disinfection of used paper materials it is compressed to extract the residual air for intensive heating followed by dispersion with added chemicals if required|
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    AT507837B1|2008-12-29|2010-10-15|Andritz Ag Maschf|METHOD AND DEVICE FOR DRAINING AND DISPERSING A FIBROUS MATERIAL|
    CN102926250A|2012-11-15|2013-02-13|贵州省赤水华龙纸业有限公司|Novel technology for papermaking through waste paper with low cost and high purity|CN106381738A|2016-09-28|2017-02-08|广西大学|Waste paper aluminum plastic packing box fast separation method|
    CN106429253A|2016-09-28|2017-02-22|广西大学|Steam heating spiral conveyor for quick separation pretreatment of waste paper aluminum plastic|
    DE102018127914A1|2018-11-08|2020-05-14|Voith Patent Gmbh|Rotor for a heating unit|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FI20155074A|FI125635B|2015-02-05|2015-02-05|Device for preheating dispersible circulating pulp|
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