• 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:
    A method of feeding cellulosic fibrous material to a high pressure treatment vessel, comprising: pressurizing a low pressure flow of the fibrous material in a transfer device; outputting a high pressure flow of the fibrous material from the transfer device to a high pressure pipeline communicating fluid with the treatment vessel; extracting liquor from the suspension of the fibrous material and liquor in the treatment vessel; introducing a first portion of the extracted liquor into a high pressure inlet of the transfer device; and introducing a second portion of the extracted liquor into the low pressure flow of the fibrous material upstream of the transfer device.
    公开号:SE534054C2
    申请号:SE0801734
    申请日:2005-06-16
    公开日:2011-04-12
    发明作者:Bertil Stroemberg
    申请人:Andritz Inc；
    IPC主号:
    专利说明:

    20 25 30 35 534 054 outlet, liquid at high pressure enters and flushes the chip suspension into the rotor chamber through the high pressure outlet and into a high pressure pipeline.
    The upper port (12:00) in the feeder housing of the HPF feeder is the entrance port where a suspension of chips and liquid is introduced into the feeder. The upper door has traditionally been the entrance for fl ice suspension at low pressure. Due to the pump feed that characterizes the LO-LEVEL ”Feed System, marketed by Andritz lnc. in Glens Falls, N.Y., however, the pressurized suspension flow from the suspension pump may be directed to such a low pressure inlet in the HPF feeder located at a location determined by the installation. The pump-fed suspension can be fed to a port which is physically located at the top, on either side, at the bottom of the HPF feeder, or even to a port which is at an inclined angle, i.e. with any desired directional angle.
    When the low pressure suspension is introduced to the low pressure inlet of the HPF feeder, one or more of the through pockets of the rotating rotor will receive the suspension. The low pressure output of the HPF feeder is located on the opposite side from the low pressure input. As the suspension is inserted into the low pressure inlet and the first end of one of the through pockets, the suspension will flow into the rotor pocket and towards a second and opposite end of the pocket, in this case towards the lower end of the pocket, and towards the low pressure outlet.
    The low pressure outlet port of the HPF feeder is typically provided with a screen element, e.g. with a screen element of the type with cast horizontal bars (see, for example, the screen element in U.S. Patent 5,443,162). This screen element holds back the chip of the suspension within the rotor of the feeder and allows some of the liquid of the suspension to pass out through the other end of the shaft and out through the screen. The discharged liquid from the low pressure outlet has previously been returned to the fl ice suspension fl in the fl ice feeder system at a position upstream of the HPF feeder. A difficulty with the screen for the low-pressure outlet is that some ice passes through the screen. These chips are then not available for further treatment in the digester.
    The chips that are introduced into the rotor pocket of the HPF digester, including the chips that the strainer element holds back, are transported further by the rotation of the rotor. After a typical rotation of one-tenth revolution of the rotor, the first end of the pocket which previously communicated with the low-pressure input will communicate with the high-pressure output of the HPF feeder. The high-pressure outlet typically communicates via one or more pipelines with the inlet to the boiler, either a continuous boiler or a batch boiler. At the same time, the rotation of the rotor will also place the other end in the through pocket, which just communicated with the low pressure outlet, so that it communicates with the high pressure inlet. The high pressure inlet typically receives a flow of high pressure fluid from a high pressure hydraulic pump.
    The pressure of this liquid is typically in the range of approx. 5 - 15 bar, and is typically approx. 7 - 10 10 15 20 25 30 534 054 bar. This high-pressure liquid displaces the suspension of chips and liquid from the continuous pocket and out through the high-pressure outlet and finally to the inlet of the digester.
    As the rotor continues to rotate, the other end of the pocket comes. which received the high-pressure liquid, then to be placed so that it communicates with the low-pressure inlet and receives another batch of suspension from the pipeline connected to the low-pressure inlet. In the same way, the first end of the kommerc will rotate so that it communicates with the low-pressure outlet of the house, where the screen element is located. The process described above will then be repeated so that during a full revolution of the rotor, each continuous pocket will receive and discharge two batches of fl ice and liquid. The rotor typically contains at least two, typically four through holes, so that the rotor repeatedly receives suspension from the low pressure inlet and discharges suspension through the high pressure outlet. The spirits in these pockets function both as input for suspension and as output, depending on the orientation of the rotor.
    A difficulty has arisen as some HPF feeders operate at relatively high rotor speeds. The difficulty lies in the fact that too large amounts of ice tend to accumulate on the screen and pass through it into the HPF housing at the low pressure outlet (position 6:00). The chips in the pipeline at the low-pressure outlet do not go to the chip treatment process and can get stuck in the lye treatment equipment that receives the low-pressure output from the HPF feeder.
    Summary of the Invention Here is presented a method of feeding non-cellulosic fibrous material to a high pressure treatment vessel comprising: pressurizing a low pressure flow of the fibrous material in a high pressure transfer device; discharging a high pressure destiny of the containing material from the transfer device to a pipeline communicating fluid with the treatment vessel; extracting liquor from the suspension of the fi-containing material in the treatment vessel; pressurizing a first portion of the extracted liquor and then introducing it into a high pressure inlet of the high pressure transfer device; and introducing a second portion of the extracted liquor into the low pressure flow of the fibrous material upstream of the transfer device, the first portion of the extracted liquor being pressurized with a pump located upstream of the high pressure inlet of the transfer device and downstream of the point where the extracted second and parts are branched.
    Brief Description of the Drawings Figure 1 is a schematic diagram of a system for feeding undisturbed cellulosic feedstock to a continuous digester or other high pressure vessel. 10 15 20 25 30 534 D54 Figure 2 is a schematic diagram of a system for feeding non-distributed cellulosic carrier material to a continuous boiler or other high-pressure vessel with a second embodiment of an ice-feeding system.
    Detailed Description of the Invention Although the systems shown and described in Figures 1 and 2 are continuous boiler systems, it is to be understood that the method of the present invention may also be used to feed one or more batch boilers, an impregnation vessel connected to a continuous boiler. , or other high pressure treatment systems. Continuous boilers can be used for the production of kraft pulp, sulphite pulp, soda ash or in similar processes.
    Figure 1 illustrates an example of an ice feeder system 10 for feeding a suspension of n-distributed cellulosic fibrous material, e.g. softwood chips, for the upper part of a continuous boiler 11. The boiler 11 typically contains a top separator with a liquor removal strainer 12 to remove excess liquor from the suspension near the entrance of the boiler 13 and to return it to the feed system 10. The boiler 11 may also contain at least one liquor removal strainer 14 to remove used cooking liquor during or after the pulp boiling process.
    The boiler 11 also typically contains one or more additional liquor removal screens (not shown) which may belong to the boiler liquor cycle, the boiler boiling circuit, or the boiler circuit with a liquor removal pipe and a dilution liquor filler. Towels, such as e.g. kraft liquor, white liquor, black liquor or green liquor, can be added to these circuits. The boiler 11 also contains an outlet 15 for discharging chemical pulp which has been manufactured and which can be led to further treatment, such as washing or bleaching.
    The wood chip feeding system 10 receives non-distributed cellulosic berm material 20 which is fed to an ice binge 21. The material 20 is typically coniferous wood or hardwood ice, but some other form of non-distributed cellulosic berm material may be used, such as sawdust, grass, straw, bagasse, hemp, or hemp. of agricultural waste, or their combinations.
    Although the term 'chips' is used in the following discussion to refer to the finely divided fi-containing cellulosic material, it is understood that this term is not limited to wood chips, but refers to any form of för-distributed fi-containing cellulosic material listed above, or corresponding.
    The chip bin 21 may be a conventional vibrating discharge bin or a DIAMONDBACKTM type basin vessel described in U.S. Patent 5,500,083 and sold by Andritz Inc. The bin 21 may include an airlock device at its entrance and means for monitor and check the chip level in the bin, as well as a valve device with a suitable mechanism to regulate the pressure in the bin. Typically, steam, either fresh steam or steam produced by evaporating the effluent (eg steam from expansion vessels) is fed to the bin 21 via a 10 15 20 25 30 534 054 or pipelines 22.
    The bin 21 typically opens into a metering device 23, such as a screw-type metering device. The dosing apparatus 23 opens into a pressure isolating device 24, such as a low pressure feeder. The pressure isolating device 24 insulates a pressurized horizontal treatment vessel 25 from the substantially atmospheric pressure prevailing in the fl ice feed system upstream of the isolating device 24.
    The treatment vessel 25 is used to treat the material with pressurized steam, e.g. with steam at a pressure of approx. 0.69 - 1.38 bar. The vessel 25 may contain a screw-type conveyor. Pure steam or steam from expansion vessels can be added to the vessel 25 via one or more of the pipelines 28.
    After treatment in the vessel 25, the suspension is fed to a high pressure transfer device 27, such as a High Pressure Feeder (HPF) sold by Andritz Inc., Glens Falls, New York. The based material is typically fed to the feeder m.h.a. a pipeline or mug 26, such as a chip mug. Heated cooking cloth, e.g. a combination of used kraft black liquor and white liquor, is typically added to the chute 26 via a pipeline 29, so that a suspension of material and lye is formed in the chute 26. The pressurized treatment vessel 25 and the pressure isolating device 24 can be replaced by a basing vessel, such as that shown in U.S. Patent 5,500,083, and sold by Andritz as a DIAMONDBACKTM basing vessel.
    The high pressure feeder (HPF) 27 contains a rotor housing consisting of a low pressure inlet (at position 12:00) connected to the chute 26, and a low pressure outlet (on the opposite side from the low pressure inlet and at position 6:00) connected to a pipeline 30. HPF the housing also contains a high-pressure inlet (at position 9:00) connected to pipeline 33, and a high-pressure outlet (on the opposite side from high-pressure inlet and at position 3:00) connected to pipeline 34.
    The HPF feeder, and in particular its encapsulated rotor 35, can be driven by a variable speed electric motor and with a speed reducing device (not shown).
    The low pressure inlet receives the heated chip suspension from the chute 26 to a well in the rotor 35. A strainer 36 at the low pressure outlet of the HPF housing holds the ice back in the rotor well but allows the liquor to pass through the rotor to be removed via pipeline 30.
    As the rotor 35 rotates, the ice held within the rotor can be exposed to high pressure liquid entering through the high pressure inlet at 9:00 from the lead 33.
    The high-pressure shutter flowing into the rotor kan can flush the ice out of the feeder through the high-pressure outlet at 3:00 and then into the pipeline 34. The high-pressure chip suspension flows through the pipeline 34 and to the top of the digester 11.
    When the inlet of the boiler 11 is removed via the strainer 12 part of the excess liquor from the suspension used to suspend the chips in the pipeline 34. The excess liquor removed via the strainer 12 is returned to the inlet of the pump 32 via the pipeline 33. The liquor in the pipeline 33, in which fresh cooking liquor may have been added, is pressurized by the pump 32 and led into the pipeline 33 to be used as a high-pressure liquid for flushing the ice through the feeder 27.
    Low pressure end (and fl ice that has passed through the strainer 36) which is exited from the feeder 27 via the low pressure outlet (at position 6:00) flows into the pipeline 30. The flow of the suspension with lye and chips in the pipeline 30 is pressurized by the pump (s) 37 , which is at least one pump and advantageous in a series arrangement of one to four screw-type centrifugal pumps. This pump (s) 37 raises the pressure of the suspension of lye and fl ice in the pipeline 30 so that the suspension in the pipeline 31 is at the same high pressure as the fl ice suspension in the pipeline 34.
    The pressure of the pressurized chip suspension in the pipeline 31 is combined with the pressurized flow in the pipeline 34 at the branch point 38 of the pipeline. a substantially larger ratio of lye to chips than the ratio of lye to chips in the pipeline 34. Thus, addition of the high lye flow from the pipeline 31 can increase the ratio of lye to chips in the pipeline 39.
    The flow volume through the pipelines 30, 31 can be relatively small in relation to the volume in the pipeline 34. By combining the chip suspension from the low-pressure outlet (pipelines 30, 31) with the ice suspension from the high-pressure outlet (pipeline 34), the ice in the pipeline 30 is led to the digester. The chips in the flow from the low-pressure outlet (pipeline 30), which would otherwise clog conventional lye treatment systems, are now fed to the boiler.
    Each pump (s) 37 may be a centrifugal pump for suspension, or some other device for pressurization and transport, such as a piston type pump for solid materials, or a high pressure ejector. Advantageously, a plurality of pumps 37 are used for pressurization and suspension, e.g. up to four such to transmit the suspension through pipelines 30, 31 and pressurize the flow from the low pressure outlet. The pumps may be centrifugal pumps, such as those sold by Hidrostal Ltd, Newbury, England, and / or Wemco® pumps supplied by Weir Specialty pumps, Salt Lake City, Utah.
    An optional pipeline 40 directs a portion of the liquor from the pipeline 33 (which has liquor from the top separator of the boiler) to the ice feed system, such as to the ice chute 26, the chip bin 21 or to the treatment vessel 25. A valve (not shown) may be used to regulate that portion. of the fl fate in the pipeline 33 which is led to the pipeline 40. The valve which regulates the fl fate in the pipeline 40 is advantageously located in the pipeline 29, but can be found anywhere in the loop formed by the pipelines 33, 40, 45 and 29. A sand separator 42 and a drainage box 43 in the pipeline can be added and placed between the pipeline 40 and the pipeline 29. The sand separator 42 can be a cyclone type separator to remove sand and debris from the lye. The drainage drawer 43 in the pipeline can be a static strainer device which removes overflow liquor from the pipeline 45 and leads it to the pipeline 46, which in turn can lead to a level tank (fi gur 2). The liquor that has not been removed by the drainage drawer passes through the pipeline 29 and is returned to the wood chip feeding system.
    Figure 2 illustrates another chip feed system 110 for feeding ice to a digester. This system 110 uses processes and equipment described in U.S. Patents 5,476,572; 5,622,598 and 5,635,025. These equipments, and the processes used to achieve them, are marketed collectively under the trademark Lo-Levelf "by Andritz Inc. The components in Figure 2 that are identical to those in Figure 1 have been provided with the same reference numbers. are similar or perform similar functions as those shown in har gur have reference numbers appearing in fi gur 1, but with the price "1".
    In the same way as in the chip feeding system 110 in Figure 1, the ice 20 is introduced into the basing vessel 121, where it is exposed to steam, which is led in via the pipeline 22. The vessel 121 opens into a dosing apparatus 123, and into a pipeline 126 which is advantageously a chip. Tube, sold by Andritz lnc. Boiling cloth is typically fed into the pipe 126 via the pipe 55, in the same manner as in the pipe 29 in Figure 1. Since the vessel 121 is advantageously a DlAMONDBACKW basing vessel, as described in U.S. Patent 5,000,083, the pressurizing device 24 in Figure 1 and the pressurized basing vessel 25 of Figure 1. As shown in U.S. Patent 5,476,572, instead of discharging the chip and liquor suspension directly to the HPF feeder 27, a high pressure suspension pump 51 fed by the pipeline 50 is used. to transport the ice 51 to the HPF feeder 27 via the pipeline 52.
    The pump 51 is advantageously a central bird pump, or any other pump of the same type as the pumps 37. The chips passing through the pump 51 are transported to the digester 11 by the feeder 27 in the same manner as shown and described with respect to 1. gur 1. 10 15 534 054 As in In the embodiment shown in Figure 1, a portion of the liquor taken from the digester 11, which flows into the pipeline 33, may optionally be redirected to the pipeline 40. The liquor in the pipeline 40 passes through a sand separator 42, the pipeline 45, a drainage drawer 43 in the pipeline , and through pipeline 144 to Iutnivàtanken 53.
    The level tank 53 ensures a sufficient flow of liquor via the pipeline 54 to the inlet of the pump 51. This tank 53 can also supply liquor to the chip pipe 126 via the pipeline 55. This level tank 53 also gives the operator an opportunity to vary the liquor level in the chip feed system, so that, if desired, the liquor level can be raised to the dosing apparatus 123 or even to the bin 121. Excess liquor removed by the drainage drawer 43 in the pipeline can optionally flow into a second level tank 60 via the pipeline 61, which is connected to the drainage drawer. Leach from the tank 60 can flow to the digester 11 via the pipeline 62, the pump 63 and the pipeline 64.
    Although the invention has been described with respect to what is presently considered to be the most practical and advantageous embodiment, it is to be understood that the invention should not be limited to the embodiment shown, but should instead cover various modifications and equivalent arrangements included in the appended claims. spirit and scope of protection.
    权利要求:
    Claims (8)
    [1]
    A method of feeding cellulosic fibrous material to a high pressure treatment vessel, the method comprising: a) pressurizing a low pressure flow of the fibrous material in a transfer device; b) discharging a high-pressure fate of the fibrous material from the transfer device to a high-pressure pipeline which communicates with the treatment vessel; c) extracting lye from the suspension of the fi-containing material and lye in the treatment vessel; d) pressurizing a first portion of the extracted liquor and then introducing it into a high pressure inlet of the transfer device; and e) introducing a second portion of the extracted liquor into the low pressure flow of the halt-bearing material upstream of the transfer device; wherein the first part of the extracted liquor is pressurized with a pump located upstream of the high pressure inlet of the transfer device and downstream from the point where the first and second parts of the extracted liquor streams branch.
    [2]
    The method of claim 1, further comprising pressurizing the second portion of the extracted liquor with a pump located upstream of the transfer device and downstream of the point where the first and second portions of the extracted liquor streams branch.
    [3]
    The method of claim 1 or 2, further comprising removing sand from the second portion of the extracted liquor before the second portion is introduced into the low pressure stream.
    [4]
    The method of claim 1, 2 or 3, further comprising introducing the second portion of the extracted liquor into a level tank and directing liquor from the level tank to the low pressure flow of fibrous material upstream of the transfer device.
    [5]
    A method according to any one of claims 1 to 4, further comprising introducing a recycled portion of the second portion of extracted lye into the high pressure treatment vessel.
    [6]
    The method of claim 5, further comprising a level tank for receiving the returned portion of the second portion and transferring the returned portion from the level tank to the vessel.
    [7]
    The method of claim 5 or 6, further comprising a pump for pressurizing the returned portion of the second portion flowing to the vessel. 534 054 10
    [8]
    A method according to any one of claims 1 to 7, further comprising discharging a low pressure flow from the transfer device and pressurizing said fate and introducing it into the vessel.
    类似技术:
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    同族专利:
    公开号 | 公开日
    SE0801734L|2008-07-28|
    US7556713B2|2009-07-07|
    RU2005119378A|2006-12-27|
    CA2508087A1|2005-12-22|
    US20050279468A1|2005-12-22|
    JP4330074B2|2009-09-09|
    JP2006009235A|2006-01-12|
    RU2383676C2|2010-03-10|
    SE530996E|2011-06-09|
    JP2009179929A|2009-08-13|
    FI20050662A0|2005-06-20|
    SE530996C2|2008-11-11|
    SE0501366L|2005-12-23|
    RU2009139280A|2011-04-27|
    FI20050662A|2005-12-23|
    CA2765084A1|2005-12-22|
    JP4859953B2|2012-01-25|
    CA2508087C|2012-07-17|
    BRPI0502230A|2006-02-07|
    ZA200504101B|2006-07-26|
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    法律状态:
    2014-02-04| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    US58138204P| true| 2004-06-22|2004-06-22|
    US60/581382|2004-06-22|
    US11/124,389|US7556713B2|2004-06-22|2005-05-09|Method and system for feeding cellulose chips to a high pressure continuous cooking system|
    US11/124389|2005-05-09|
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