• 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:
    8/8 SUMMARY The invention relates to a pulp treatment apparatus, such as a pressure diffuser. The apparatus is provided with a strainer, having a considerable weight, which is moved by means of a drawbar 5 in a reciprocating manner between an upper and a lower position. The drawbar 5 is operated by means of a hydraulic cylinder 61 for vertical movement of said screen in a first slow stroke co-current with the mass flow and movement of said screen in a second rapid stroke countercurrent to the mass flow. According to the invention, the pressure diffuser has an inlet in the bottom of the vessel, but the hydraulic cylinder 61 at the upper part of the vessel. By means of this design, an increased active pressure area in the hydraulic cylinder can be obtained for the rapid stroke of the screen, which thus limits the nominal power of the hydraulic system. Figure (3) 0910 _pci_2_sE_txt.doc
    公开号:SE537066C2
    申请号:SE1200114
    申请日:2009-08-25
    公开日:2014-12-23
    发明作者:Robert Theiler；Allan Jonsson
    申请人:Valmet Oy；
    IPC主号:
    专利说明:

    537 066 for a pressure diffuser of the TD7O type is between 150 and 250 bar. The installed nominal power and energy consumption are thus quite high.
    SUMMARY OF THE INVENTION According to the present invention, the above-identified disadvantage is overcome by locating the mass inlet at the bottom of the vessel, and the hydraulic cylinder with a movable piston inside the hydraulic cylinder is located at the upper part of the vessel. By means of this design, an increased active pressure area in the hydraulic cylinder can be obtained for the rapid stroke of the screen, which thus limits the nominal power of the hydraulic system, since the maximum power requirement develops during the rapid stroke of the screen.
    According to a further detailed aspect, the movable piston inside the hydraulic cylinder is also connected to the screen via the drawbar in such a way that an annular hydraulic chamber, penetrated by said drawbar, is located under the piston of the hydraulic cylinder. Thus, a full-size hydraulic chamber, located above the piston of the hydraulic cylinder, is also preferably not penetrated.
    Accordingly, it is a primary object of the present invention to provide a new and improved pulp washing apparatus in a pressure diffuser in a manner that reduces the required installed rated power, and to reduce the energy consumption for continuous operation.
    Yet another object is to be able to reduce the maximum pressures required for the hydraulic unit, which will reduce the wear on the components as well as reduce the installation costs of a lower capacity hydraulic unit, but still be able to perform the intended functions.
    These and further objects and advantages of the present invention will become more apparent upon reference to the following description, drawings, and claims.
    BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a vertical cross-sectional view through the center line of a pressure diffuser according to a design according to the prior art, i.e. the design currently sold by Metso and originally developed by Kamyr AB; Fig. 2 is a vertical cross-sectional view through the center line of a pressure diffuser according to another design according to the prior art, i.e. the design currently sold by Andritz lNC and originally developed by Kamyr INC; and Fig. 3 is a vertical cross-sectional view through the center line of a pressure diffuser according to the invention, used to control the movement of the screen unit.
    DETAILED DESCRIPTION OF THE DRAWINGS The presently preferred embodiment of the invention will now be referred to in detail, an example of which is illustrated in the accompanying drawings. with a movement from the upper part to the bottom in figure 1 or with the reverse flow direction as depicted in figure 2.
    In the prior art embodiment shown in Figure 1, a pressure diffuser is shown with the hydraulic unit arranged at the upper part, which lifts the screen unit slowly upwards towards gravity and parallel to the flow direction of the mass. In the prior art embodiment shown in Figure 2, a pressure diffuser is shown with the hydraulic unit arranged at the bottom, which pushes the screen unit 8 slowly upwards towards gravity and parallel to the flow direction of the mass. A disadvantage of this design is that the entire screen unit 8 is supported and balanced at the lower end, which will cause abnormal abrasion in slide rails (not shown here), arranged in the upper part of the screen unit.
    Usually, a discharge scraper 3 is also located at the opposite end of the diffuser, the purpose of which is to assist in discharging washed pulp. Thus, the hydraulic cylinder is conventionally located at the opposite end relative to the discharge end and the associated discharge scraper.
    According to both of these prior art designs, the rapid return stroke is activated by pressurizing the annular cylinder surrounding the drawbar 5, and thus a less active net area of the piston is possible for the rapid stroke.
    Now invoking common features in all the drawing figures, pressure diffusers are illustrated consisting of a substantially vertically upright pressure vessel. The vessel is closed, except for a pulp inlet 1 adjacent an upper part or bottom part of the vessel and a pulp outlet 2 adjacent the opposite end part of the vessel.
    Usually, discharge scrapers 3 are also arranged near the outlet.
    The elongate annular screen unit 8 is generally slightly conical in shape and tapers radially inwardly in the feed direction of the pulp. Thus, as illustrated in Fig. 1, pulp enters the vessel through the pulp inlet 1 and passes downwardly through an annular internal volume, defined between the wall of the inwardly facing pressure vessel and the outwardly facing surface of the screen 8 for flow out of the vessel through the pulp outlet 2. A plurality of distribution chambers 7, wherein here 10 10 15 20 25 30 35 537 066 distribution chambers are shown, each having an inlet, are arranged around the exterior of the vessel wall for the addition of constriction liquid, i.e. washing liquid WL, in radial directions through the pulp bed, trapped between the inside of the wall of the pressure vessel and the surface of the strainer unit (light gray flow arrows in the figures). Thus, liquid is introduced through said distribution chambers, at positions arranged at vertical distances through the wall of the pressure vessel, via nozzle bores in said wall, located substantially peripherally around the internal volume at each vertical position. The screen unit 8 is reciprocating in a substantially vertical axial direction, preferably by means of a hydraulic cylinder 61. The piston 60 for the hydraulic cylinder 61 is connected to the screen unit 8 via a drawbar 5 which displaces the screen unit 8 in a vertical upward or downward direction. according to wish. It will be appreciated that during normal operation the screen is moved in a conventional manner in the direction of the pulp flow and then rapidly moved towards the pulp flow in order to obtain both backwashing of the screen and reversal to a new starting position for a type of wash. The total sieve height in the sieve unit is indicated by the reference sign SH.
    It will be appreciated that in operation mass is provided through the inlet 1 and into the annular chamber between the wall of the pressure vessel and the screen unit 8 and flows outwards from the vessel through the outlet 2. Displacement fluid WL is introduced through the distribution chambers 7 and passes substantially radially inwards through the mass and then through the outer screen surface of the screen unit 8, where displaced liquid is separated from the pulp and collected in the internal volume within the screen unit 9. Consumed displacement liquid FL is removed from the internal volume through an outlet channel 4. In general, the screen unit 8 is pressed during the speed as the mass flow.
    This is achieved by means of the hydraulic cylinder 61 which pushes the drawbar 5 into the pressure vessel to displace the screen unit 8 downstream of the flow direction of the mass.
    Referring now to the invention as shown in Figure 3, the pulp inlet 1 is instead located in the bottom of the vessel and the hydraulic cylinder 61 with a movable piston 60 is located inside the hydraulic cylinder at the upper part of the vessel. The movable piston 60 inside the hydraulic cylinder is connected to the screen 8 via the drawbar 5, so that an annular hydraulic chamber, penetrated by said drawbar 5, is located under the piston 60 of the hydraulic cylinder 61.
    Thus, a full-size hydraulic chamber, not penetrated by any drawbar, is located above the piston of the hydraulic cylinder. Instead of a single discharge scraper with a central drive shaft, as shown in Figures 1 and 2, there are instead several discharge scrapers 3a, 3b, located with their drive shafts offset from the center line of the pressure diffuser. These discharge scrapers may be installed in numbers of 3 or preferably 4 units, and located at angular positions at 120 and 907 536 066 degrees, respectively, in the peripheral direction. Thus, the hydraulic cylinder 61 and the discharge scraper can be arranged at the same end of the pressure diffuser.
    As indicated, the interior of the screen unit 8 can also be equipped with at least one separating wall 10, indicated by a dashed line, which can separate the washing filtrate FL into 2 fractions or more, which second fraction can be evacuated through a second washing filtrate outlet 4b, indicated by dashed lines. By means of such an arrangement, a multi-stage washing function can be obtained with physical separation of the filtrates. Such a physical wall need not be necessary in a pressure diffuser, as shown in Figure 1, since the hotter wash filtrate collects in the upper part of the screen unit, while successively colder wash filters collect in the lower parts of the screen unit, and thus not any mixture of filtrates is induced by thermal convection, as the filtrates will be separated depending on the difference in temperature and specific gravity.
    IMPLEMENTATION If the concept according to the invention is installed in a pressure diffuser of the type TD140 (having a towing capacity of 2,000 ADMT mass / 24 hours), then the main hydraulic cylinder 61 has a diameter of 380 mm, and the drawbar in the hydraulic cylinder has a diameter of 180 mm. The actuating active net area of the piston in the annular chamber is then only approximately 879 cmz, while the actuating area of the piston in the full size chamber is 1,133 cmz. The impact area of the piston in the full size chamber is thus almost 28% larger than that in the annular chamber. This dramatically larger force-acting area for the rapid stroke, which determines the final requirements for the required maximum pressure and capacity of hydraulic pumps, can instead be used to select smaller standard pumps for more modest nominal effects. Although the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it should be understood that the invention is not limited to the disclosed embodiment, but on the contrary is intended to cover various modifications and equivalent arrangements, including within the scope of the invention. the spirit and scope of the appended claims. For example, under the main generic requirement, output means other than the output scrapers shown in Figure 3 may be used, i.e. transversely mounted transport screws etc. are used. Parallel accumulator cylinders for further reduction of the power consumption in the hydraulic system, as shown in the attached PCT SE2009 / 050367, can also be used.
    权利要求:
    Claims (4)
    [1]
    1. 0 15 20 25 30
    [2]
    2.
    [3]
    3. 537 066 PATENT REQUIREMENTS. Pressure diffuser for washing pulp comprising: a substantially upright, liquid-tight, pressurized vessel defining a first internal volume to contain pulp to be treated under pressure; a mass inlet (1) to the vessel; a pulp outlet (2) from the vessel, the pulp flowing substantially vertically between said pulp inlet (1) and said pulp outlet (2) through an annular internal volume defined between the wall of the inwardly facing pressure vessel and the outwardly facing surface of a screen (8); wherein the screen (8) defines a surface of rotation, upright within the vessel, and partially defines said internal volume containing mass and having upper and lower ends of different cross-sectional areas; washing liquid supply means (WL) (7) for adding washing liquid to the pulp flow, extractant for removing liquid (FL) from the pulp flow through said screen (8), a hydraulic cylinder arrangement, including at least one hydraulic cylinder (61) for vertical movement of said screen (8) via a drawbar (5) in first a slow stroke co-current with the pulp flow and at the velocity of the pulp flow, and movement of said strainer in a second rapid stroke countercurrent to the pulp flow, characterized in that the pulp inlet (1) is located in the bottom of the vessel, and the hydraulic cylinder (61) with a movable piston (60) inside the hydraulic cylinder is located at the upper part of the vessel, and that the movable piston (60) inside the hydraulic cylinder is connected to the screen (8) via the drawbar (5) on such that an annular hydraulic chamber, penetrated by said drawbar (5), is located below the piston (60) of the hydraulic cylinder (61), and that a full-size hydraulic chamber, not penetrated by any drawbar (5), is located above the piston (60) of the hydraulic cylinder (61), thus limiting the rated power of the hydraulic system. Apparatus according to claim 1, characterized in that at least one discharge scraper (3a / 3b) is located at the same end as the hydraulic cylinder (61). Apparatus according to claim 2, characterized in that at least three discharge scrapers (3a / 3b) are located with their drive shafts offset from the center line of the pressure diffuser. 537 066
    [4]
    Apparatus according to claim 3, characterized in that the discharge scrapers (3a / 3b) are located at even angular positions in the peripheral direction, i.e. if you use three discharge scrapers at an angle of 120 degrees from each other in the peripheral direction or if you use four discharge scrapers at an angle of 90 degrees from each other in the peripheral direction.
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    同族专利:
    公开号 | 公开日
    US20120216977A1|2012-08-30|
    CN102575424B|2014-08-13|
    SE1200114A1|2012-02-23|
    US8747613B2|2014-06-10|
    WO2011025412A1|2011-03-03|
    CN102575424A|2012-07-11|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4276167A|1979-04-25|1981-06-30|Kamyr Aktiebolag|Diffuser arrangements|
    US4529482A|1979-04-25|1985-07-16|Kamyr Aktiebolag|Apparatus for the treatment of pulp having oscillating distributing wiper blades|
    SE435400B|1980-01-10|1984-09-24|Kamyr Ab|SILAN SYSTEM FOR DEDUCTION OF LIQUID FROM SUSPENSIONS IN MOVEMENT|
    US4556494A|1980-12-04|1985-12-03|Kamyr Aktiebolag|Method of diffusion washing or thickening of pulp|
    US4908896A|1987-11-27|1990-03-20|Kamyr Ab|Backflushing pressure diffuser screens|
    US5129119A|1991-04-09|1992-07-14|Glentech Inc.|Diffuser efficiency|US8888958B2|2012-12-31|2014-11-18|Andritz Inc.|Pressure diffuser with an annular baffle screen plate over water inlet|
    法律状态:
    2019-04-02| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    PCT/SE2009/000390|WO2011025412A1|2009-08-25|2009-08-25|Pressure diffuser with less power rating in hydraulic system|
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