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

    公开号:SE535185C2
    申请号:SE1000921
    申请日:2010-09-10
    公开日:2012-05-15
    发明作者:Ulf Jansson；Jonas Bjoerkstroem
    申请人:Ovivo Luxembourg Sarl；
    IPC主号:
    专利说明:

    535 185 In general, a number of requirements can be set for an apparatus for mixing pressurized, hot steam into a pulp suspension at medium consistency. The steam must be added so that local excesses do not occur when passing through the appliance. The mixing must take place so that local pressure variations are minimized. Any implosions due to vapor bubbles must occur in a part where the components or the construction can not be damaged. The appliance should have some form of built-in elasticity to absorb pressure and impacts caused by any momentary disturbances in steam and mass flow into the appliance.
    A number of apparatuses for adding steam to a pulp suspension are known. SE 502 393 describes such an apparatus, which comprises a wedge-shaped choke body for reducing the flow chamber of the pulp suspension, in order thus to obtain a high flow rate of the pulp suspension upon addition of the steam. A disadvantage of this apparatus is that it cannot handle varying flows of a pulp suspension.
    Devices with a rotating part for mixing steam into the pulp suspension are also common. A problem with these devices is that the rotation causes large pressure variations, which create local zones with very low pressure where the steam seeks with implosions as a result, as described above. The object of the present invention is to provide an apparatus for mixing a fluid into a pulp suspension, where the apparatus further reduces the occurrence of implosions. This is achieved with an apparatus which ensures that the pulp flow maintains a high flow rate in connection with the mixing. The apparatus according to the invention is characterized in that the apparatus comprises a control unit, the control unit comprising an element, which is arranged in the flow channel for regulating the cross-sectional area of the flow channel, the element being arranged to reduce the cross-sectional area of the flow channel at a low fluid flow of the first fluid and increase the cross-sectional area of the flow channel at a high fluid flow of the first fluid to ensure that the flow rate of the first fluid exceeds a predetermined minimum value at the second inlet.
    The invention will be described in more detail below with reference to the accompanying drawings.
    Figure 1 shows a perspective view of a first preferred embodiment of an apparatus according to the invention.
    Figure 2 shows the apparatus according to figure 1 in a side view.
    Figure 3 shows the apparatus according to figure 1 in a top view.
    Figure 4 shows the apparatus according to figure 1 in a rear view.
    Figure 5 shows the apparatus according to Figure 1 in a side view in section, where a control unit of the apparatus is shown in more detail.
    Figure 6 shows a shaft and a flap of the control unit in cross section.
    Figure 7 shows an embodiment, where the apparatus comprises a second pipeline.
    The apparatus to be described in the following is intended for use in a process industry for mixing a second fluid into a first fluid. In a preferred embodiment, the apparatus is used in a cellulose plant, where the second fluid consists of a hot steam and where the first fluid consists of a pulp suspension of medium consistency, where the hot steam is intended to preheat the pulp suspension. to a desired temperature, which is suitable for a subsequent bleaching step. However, the principle of the invention can also be used for devices in mixing other fluids, such as e.g. gases such as oxygen, chlorine gas, possibly also ozone or for mixing in a liquid, such as e.g. a pH-adjusting liquid, chlorine dioxide or other treatment liquid in said pulp suspension.
    The apparatus comprises a substantially parallelepiped housing 1 for receiving a pulp suspension from an upstream first pipeline 2, and delivering the pulp suspension to a downstream second pipeline 3, an filling means 4 for mixing hot steam to the pulp suspension and a control unit 5. , which ensures that a suitable flow rate of the pulp suspension prevails when the steam is added, in order to avoid steam explosions occurring. Thus, the control unit 5 ensures that the flow rate of the pulp suspension exceeds a predetermined minimum value at the steam addition.
    The housing 1 is bounded on the outside by an upper boundary surface formed by the roof portion 6, side boundary surfaces formed by the side walls 7 and 8 and the upstream short side wall 9 and the downstream short side wall 10, and a lower boundary surface formed by the bottom portion 11.
    Inside, the housing 1 comprises a substantially parallelepipedic chamber 12. The chamber 12 has a circular first inlet 13 for receiving the pulp suspension from the upstream arranged first pipeline 2, a flow channel 44, which opens into the first inlet 13 and a 5 30 35 535 185 rectangular outlet 14 for delivering the pulp suspension to the downstream second pipeline 3. The first inlet 13 is arranged at the upstream short side wall 9 and the outlet 14 is located at the downstream short side wall 10. The roof portion 6, side portion 6, the means 7, 8 and the bottom portion 11 define the flow channel 44 for the pulp suspension, thus the flow channel 44 is arranged between the first inlet 13 and the outlet 14.
    The circular inlet opening of the first inlet 13 is substantially equal to the pipe area of the first pipeline 2 and smaller than the cross-sectional area of the flow channel 44.
    The rectangular outlet opening of the outlet 14 is substantially equal to the cross-sectional area of the flow channel 44. The longitudinal direction of the chamber 12 coincides with the longitudinal direction of the flow channel 44 and the flow direction of the pulp suspension.
    Furthermore, the chamber 12 has an elongate second inlet 15, which opens into the flow channel 44, for receiving the pressurized, hot steam from the filling means 4 to the flow channel 44. The second inlet 15 is arranged at the roof portion 6 of the housing and is located near the chamber outlet 14. 4 connects to the second inlet 15 from the top of the roof portion 6. The second inlet 15 has its longitudinal direction across the flow direction of the pulp suspension through the flow channel 44.
    In addition, the chamber 12 has an elongate opening 16 across the longitudinal direction of the chamber 12 and two crescent-shaped recesses 17. The opening 16 is arranged at the bottom portion 11 of the housing near the first inlet 13 of the chamber, and the recesses 17 are arranged at the side walls 7,8 on either side of the opening 16. .
    The adding means 4, for the supply of the pressurized hot steam to the chamber 12 and the flow channel 44 via the second inlet 15, comprises a pipe flange 19, which connects to a steam line (not shown) for feeding pressurized steam to the filling means 4. Furthermore, the filling means 4 comprises a pipe part 20 with a first end 21 and a second end 22. The first end 21 is arranged to the pipe flange 19 and the second end 22 is connected to an elongate valve 23 of the filling means. the member 4. The other end 22 is compressed, which makes the pipe opening of the other end elongate. The valve 23 connects via a screw connection 24 to the second inlet 15 of the chamber 12. The valve 23 comprises a rotatable valve shaft 25, which has an elongate longitudinal slot 26 for passage of the steam and a valve shaft housing 27, which encloses the valve shaft 25. Through to rotate the valve shaft 25 from 0 ° to 90 °, the valve 23 can go from a fully open position to a fully closed position. The gap 26 extends over the entire length of the second inlet 15. The rotation of the valve shaft 25 is controlled by a control member 28, which is arranged on the valve shaft housing 27 at one end of the valve shaft 25.
    The control unit 5 comprises an element 29 in the form of a flap 29, a rotatable shaft 37, two torque arms 48 and 49, and two pneumatic cylinders 50 and 51.
    The flap 29 is arranged in the flow channel 44 and has a width which is substantially equal to the widths of the chamber 12 and the flow channel 44, respectively, and a length which is slightly shorter than the lengths of the chamber 12 and the flow channel 44, respectively. The flap 29 is preferably rectangular and flat and comprises a top side 30 facing the bottom portion 11 of the housing, a bottom side 31 facing the bottom portion 11 of the housing, two parallel long sides 32, 33 facing the side walls of the housing, a first, rear end 34 or front short side 34 and a second, front end 35 or front short side 35. The first short side 34 is fixedly provided with three bolts 36 to the rotatable shaft 37, which is arranged in the elongate opening 16 and the recesses 17. The second short side 35 is free and rotatably movable with the shaft 37 between a lower end position 38 and an upper end position 39. The second short side 35 is located substantially flush with the second inlet 15 and downstream of the first the short side 34. The upper side 30 of the flap 29 forms an acute angle with the flow direction of the pulp suspension. The length of the shaft 37 exceeds the width of the housing 1 so that the shaft 37 has a protrusion on either side of the housing. The part of the shaft 37 which projects outside the chamber 12 is partially enclosed by a cover 41 of the control unit 5, in which cover 41 the shaft 37 is mounted with two self-lubricating bearings 43. The cover 41 is fixedly arranged in the bottom portion 11 of the housing 1 so that the upper portion of the housing 41 projects into the chamber 12 and the lower portion 45 of the housing 41 protrudes below the chamber 12 and from the bottom portion 11 of the housing 1.
    The shaft 37 comprises two shaft pins 46, 47 in the longitudinal direction of the shaft, which shaft pins 46, 47 form both outer ends of the shaft 37, where the shaft pins 46, 47 project from the housing 41 on either side of the housing 41. On each free end of the shaft pins 46, 47 the torque arm 48, 49 is fixedly arranged perpendicular to the longitudinal direction of the shaft 37. The torque arms 48, 49 thus rotate together with the shaft 37 and the flap 29 when they are rotated. Respective torque arms 48, 49 abut against the pneumatic cylinder 50, 51. In the embodiment shown, this pneumatic cylinder consists of a piston rod-free bellows cylinder 50, 51 with end plates 52, 53, which abut against the torque arms 48, 49. The bellows cylinders 50, 51 years permanently arranged. In the embodiment shown, the respective bellows cylinders 50, 51 are fixedly arranged on each side wall 7, 8.
    In use, the pulp suspension in the flow channel 44 passes over the upper side of the flap 29. At a high mass flow, the flap 29 is pressed downwards so that the cross-sectional area of the flow channel 44 increases above the flap 29. At a low mass flow, the flap 29 is pressed upwards by the bellows cylinders 50, 51 10 15 So that the cross-sectional area of the flow channel 44 decreases above the flap 29. This ensures that the flow rate of the pulp suspension is ensured at a predetermined minimum flow rate at the addition of steam of the second inlet 15 independent of the flow of the pulp suspension, admixture is obtained which reduces the occurrence of implosions. In addition to the bellows cylinders 50, 51 abutting with a compressive force against the torque arms 48, 49, the bellows cylinders 50, 51 also dampen impacts and vibrations which occur in the torque arms 48, 49 from the flap 29, when the pulp suspension passes over the flap 29 and steam is mixed into the mass suspension.
    The flap 29 thus adjusts to an equilibrium position, where the flow of the pulp suspension causes a compressive force on the flap 29, which is balanced by the force from the bellows cylinders 50, 51. The flap 29 is thus self-regulating and its current angle relative to the bottom portion 11 depends on the mass flow. size. The predetermined flow rate, at the second inlet 15, can be set by adjusting the abutment force of the bellows cylinders 50, 51 against the torque arms 48, 49, whereby other equilibrium positions can be set to avoid implosions.
    By increasing the abutment pressure of the bellows cylinders 50,51 against the torque arms 48, 49, the shaft 37 is rotated so that the flap 29 is pressed upwards to a new equilibrium position. This means that the cross-sectional area of the pulp flow above the flap decreases, which means that the flow rate of the pulp suspension when adding steam at the second inlet 15 increases.
    Thus, the apparatus is self-regulating in that the control unit 5 ensures that the flow rate of the mass flow during the addition of steam is always high enough to reduce the occurrence of steam implosions. Figure 7 shows an embodiment in which the apparatus comprises the downstream second pipeline 3. The outlet 14 of the chamber 12 connects to the inlet of the second pipeline 3 by means of a pipe flange 55, which is arranged to a pipe flange of the second pipeline 3. The cross-sectional area of the second pipeline 3 is larger than the cross-sectional area of the chamber 12. In a preferred embodiment, the cross-sectional area of the second pipeline 3 is at least 50% larger than the cross-sectional area of the flow channel 44. The area increase between the cross-sectional area of the outlet 14 and the cross-sectional area of the other pipeline 3 takes place momentarily in a single step. The length of the second pipeline 3 is advantageously from twice up to ten times the diameter of the second pipeline 3 or other equivalent cross-sectional dimension.
    Because the cross-sectional area of the second pipeline 3 is larger than the cross-sectional area of the flow channel 44, the mass suspension, after the outlet 14, will be retarded in the areas of the second pipeline 3 which lie radially outside and are retained towards the upstream side of the second pipeline 3. the inner jacket surface of the second pipeline 3 will therefore be gradually built up of a fibrous volume of stationary cellulose pulp. In contrast, the pulp suspension in the middle of the second pipeline 3 will continue at a high velocity through the second pipeline 3 to a subsequent third pipeline 54, which has a diameter which is substantially smaller than the diameter of the second pipeline 3.
    In the bottom part 11 of the housing 1 and in the cover 41 two plugs 45 and 56 are arranged. The plugs 45, 56 are intended to be removed to flush the housing 1 and the cover 41 in the event of a possible plugging of the pulp suspension.
    The invention achieves the following advantages over the prior art: - that the occurrence of steam explosions is reduced - that the apparatus and associated pipelines are avoided from shaking and causing downtime, and that heavy and oversized foundations and / or pipes - wires are needed, which can withstand these powerful bangs.
    The invention has been described above on the basis of a specific embodiment. It is to be understood, however, that further embodiments and variants are possible within the scope of the appended claims. For example, another type of pneumatic cylinder can be used, e.g. piston rod type cylinders. It will also be appreciated that another pressing member may be used, e.g. piston rod cylinders, spring-loaded cylinders and torsion springs.
    It is also understood that the apparatus does not necessarily have to include a pipeline according to the second pipeline 3, according to Figure 7. The apparatus can of course be arranged for pipelines, of any dimensions, which carry pulp suspensions.
    The design of the speed regulating element may have a different design than a flat flap, but may, for example, be wedge-shaped.
    权利要求:
    Claims (9)
    [1]
    Apparatus for mixing a second fluid into a first fluid, said apparatus comprising: - a housing (1) having a chamber (12) having a first inlet (13) for receiving the first fluid, a flow channel ( 44) for the first fluid, a second inlet (15) opening into the flow channel (44) for receiving the second fluid and an outlet (14) for dispensing a mixture of the first and the second fluid, characterized in that the apparatus comprises a control unit (5), the control unit (5) comprising an element (29), which is arranged in the flow channel (44) for regulating the cross-sectional area of the flow channel (44), the element (29) being arranged to reduce the flow channel (44) cross-sectional area at a low fluid flow of the first fluid and increasing the cross-sectional area of the flow channel (44) at a high fluid flow of the first fluid to ensure that the flow rate of the first fluid exceeds a predetermined minimum value at the second inlet (15).
    [2]
    Apparatus according to claim 1, characterized in that the element (29) is a flap (29) having a first end (34) and a second end (35), the first end (34) being fixedly mounted to a rotatable shaft (37) and where the other end (35) is free.
    [3]
    Apparatus according to claim 2, characterized in that the other end (35) of the flap (29) is arranged substantially flush with the second inlet (15).
    [4]
    Apparatus according to any one of claims 2-3, characterized in that the upper side (30) of the flap (29) forms an acute angle with the flow direction. 10 15 20 25 30 35 535 185 12
    [5]
    Apparatus according to any one of claims 2-4, characterized in that the control unit (5) comprises at least one torque arm (48, 49), which is arranged on the shaft (37) and where the torque arm (48, 49) is pressurized.
    [6]
    Apparatus according to claim 5, characterized in that the control unit (5) comprises a pneumatic cylinder (50, 51), which is arranged to provide the pressure load on the torque arm (48, 49).
    [7]
    Apparatus according to any one of claims 1-6, characterized in that the apparatus comprises a second pipeline (3), which connects to the outlet (14) on the downstream side of the outlet, the cross-sectional area of the second pipeline (3) being at least 50% larger than the outlet ( 14) cross-sectional area.
    [8]
    Apparatus according to any one of claims 1-7, characterized in that the element (29) is arranged to position itself around an equilibrium position which is dependent on the flow of the first fluid.
    [9]
    Use of an apparatus according to any one of claims 1-8, for mixing hot steam into a pulp suspension.
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    同族专利:
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    JP2013538682A|2013-10-17|
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    法律状态:
    2019-06-04| RPOP| Patent has been republished in amended form after opposition|
    优先权:
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