CN108442157B

CN108442157B - Rotary drum pulper and water adding method thereof

Info

Publication number: CN108442157B
Application number: CN201810232297.2A
Authority: CN
Inventors: 侯焕涛; 李天虎; 金莫·万哈拉
Original assignee: Andritz China Ltd
Current assignee: Andritz China Ltd
Priority date: 2018-03-21
Filing date: 2018-03-21
Publication date: 2021-09-14
Anticipated expiration: 2038-03-21
Also published as: CN108442157A; WO2019179450A1

Abstract

The invention relates to a drum pulper, comprising: a drum; and a feed hopper for inputting material to the feed end of the drum; characterized in that the drum pulper further comprises a water feed pipe, said water feed pipe being designed to feed water directly into the interior of said drum from the feed end of said drum. The invention also relates to a water adding method of the drum pulper, which adopts the drum pulper, wherein water is directly added into the drum pulper through a water adding pipe without flowing through the feed hopper.

Description

Rotary drum pulper and water adding method thereof

Technical Field

The invention relates to a drum pulper, in particular to a water adding device of the drum pulper, which is used for providing pulped water into the drum pulper.

Background

Drum pulpers are pulping devices widely used in the pulping field. The size reduction requires a certain amount of size reduction water, which needs to be mixed with the size. The pulped water of a drum pulper is usually fed into the feed hopper of the drum pulper and then flows into the drum pulper. Figure 8 shows in perspective a part of the drum and the feed end of the drum pulper. For the sake of clarity, the feed pipe for feeding water from above the feed hopper, wherein the material is fed from the feed hopper opening together with the disintegrated water, is shown in a partly enlarged view in fig. 8A. Fig. 9 shows in a perspective view another arrangement of a prior art downcomer, in which the downcomer is inserted into the feed hopper from the side of the feed hopper and in which a number of outlet openings are provided.

The gap between the drum pulper and the hopper is such that it is necessary to seal between the hopper and the drum pulper by means of a packing or labyrinth seal. Moreover, if the seal is worn or broken, or the amount of the pulped water fluctuates due to fluctuation of the concentration of the pulped water in the drum pulper in actual production, the pulped water may leak from the seal.

The pulped water (liquor) of a drum pulper is used in a broad sense. For pulping of waste paper, chemicals (deinked pulp) or chemicals (waste boxboard pulp) can be added at the feed hopper of the drum pulper. At present, in the paper making industry, a water (liquid) inlet pipe is mostly arranged on a feed hopper. The arrangement features a single two addition points (water and drug separate) above the feed hopper, or a single addition point after mixing the water and drug prior to addition to the feed hopper. Even though the inlet pipe may be in the form of a pipe, in the prior art the position of the inlet pipe is usually also stopped above the feed hopper, and the water always flows along the inner wall of the feed hopper into the feed opening of the drum pulper.

For example, although chinese utility model CN204000425U refers to the water inlet pipe and the medicine inlet pipe, it is obvious that the position of the water inlet pipe and the medicine inlet pipe is not selected beyond the conventional technical means in the field, and it can be understood from fig. 2 of the utility model that they are vertically arranged above the feed hopper, and water and the corresponding chemicals are directly added into the feed hopper from above. This is also the reason why the feed hopper requirement and the feed opening therein are connected by a sealing means.

The arrangement of the seal between the rotating drum pulper and the stationary feed hopper is above all complicated and there is no prior art device that can achieve a highly reliable seal at low cost. The seal between the rotating member and the fixed member causes inhibition of rotation of the rotating member, thereby consuming energy.

Secondly, the cost of sealing between the rotating drum pulper and the stationary feed hopper is high, and it is therefore desirable to find a solution that does not require any sealing, or at least no strict sealing, between the feed hopper and the feed end of the drum pulper. At the same time, it should also be possible to ensure a smooth addition of the pulped water to the drum pulper, especially if it is possible to add it in portions.

Disclosure of Invention

The technical problem that the present invention seeks to solve is therefore to provide a drum pulper which simplifies the sealing between the feed hopper and the feed end of the drum pulper, while ensuring the addition of pulped water to the interior of the drum.

This technical problem is solved by a drum pulper according to the present invention, comprising: a drum; and a feed hopper for inputting material to the feed end of the drum; wherein the drum pulper further comprises a water feeding pipe, said water feeding pipe being designed and adapted to feed water from the feed end of the drum directly into the interior of the drum.

According to a preferred embodiment of the drum pulper according to the invention, the water supplied by the water supply pipe enters the feed end of the drum at a position outside the contour enclosed by the path of motion of the material lifted along the circumference of the drum and thrown off in the upper part of the feed end of the drum, seen in an axial section through the feed end of the drum. In a drum pulper, material to be pulped quickly falls from the lowest point of the feed hopper to the drum feed end, and the material, after entering the interior of the drum, is lifted upwards from the lowest point of the drum feed end at the cross section along the circumference of the inner wall of the drum until it reaches a high point in the vicinity of the 11 o' clock position on the drum cross section by the combined action of a plurality of lifting plates distributed in the circumferential direction and a plurality of baffles arranged axially one after the other as the drum rotates. At this point, the centrifugal force cannot overcome the force of gravity and the material is no longer supported by the lifter plate and thus detaches from the inner wall of the rotating drum and falls to the 5-6 o 'clock position on the cross-section and then repeatedly moves with the rotation of the drum to the 11 o' clock position on the cross-section. Therefore, the materials fall and are beaten repeatedly, thereby achieving the purpose of disintegration. The movement path along which the material is thrown from above and the path along which the material is lifted from the lowest point to above along the circumference thus together enclose the area of the cross-section of the drum over which the material may appear, while the areas outside this cross-section, for example the half-moon-shaped areas formed at 1-4 o' clock, are areas which are not hit by the material. By further selecting a position in this region that does not interfere with the internal structure of the drum, it is possible to find a position where the water feed pipe can be arranged. For example, FIG. 6 shows in schematic cross-section the movement of material within a drum pulper, with no or only a few materials reaching the "upper right" shaded area shown.

Further, the water feeding pipe is arranged outside the feed hopper and extends into the rotary drum. The water feeding pipe penetrates through a flange on the end face of the feed hopper and enters the inside of the rotary drum from the upper part of the feed hopper. The feed pipe can also be passed from above the feed hopper through the feed hopper end flange into the interior of the drum, where the position above the feed hopper side is selected to avoid the possible presence of material, as described above. However, in an alternative embodiment, it is also conceivable to insert the water feed pipe directly through the feed hopper into the interior of the drum, without leaving a space above the feed end of the drum where the feed hopper meets the feed end of the drum. The difference between these two solutions is that, since the area of the cross-section of the drum into which the water feed pipe can extend is limited, if the water feed pipe is arranged to extend directly through the feed hopper into the interior of the drum, the upper wall of the feed hopper, where it meets the feed end of the drum, needs to be designed higher in order not to extend the water feed pipe to the lower part of the cross-section of the drum.

Further, although the above general mention of water addition pipes does not limit the number of water addition pipes, it should be understood that in one embodiment there are several water addition pipes extending into the interior of the drum at different depths. Because the material advances in the drum pulper spirally and is conveyed along the axial direction gradually, the water adding pipes extending into different depths can add water at different positions, and the effect of adding water in different times is similar to that of the pulper in an intermittent operation mode.

Further, in view of the technical effect of achieving the divided water adding, the water adding pipe can also be provided with a pipe orifice with adjustable sectional area change. As the cross-sectional area of the nozzle changes, the water has a different initial velocity as it enters the drum, thereby spraying the water to different depths within the interior of the drum. In an alternative embodiment, the water addition pipe has a nozzle with an adjustable water outlet angle, so that the water has a different initial angle when entering the drum, thereby spraying the water to different depths inside the drum. Obviously, the pipe orifice of the water adding pipe can be designed to change the size of the section and adjust the water outlet angle, so that water can be sprayed to different depths in the rotary drum more flexibly.

In a further embodiment, it is also possible to provide only one water feed pipe which projects into the interior of the drum.

According to a preferred embodiment of the drum pulper according to the invention, the feed hopper is connected to the drum in a non-sealing manner, e.g. not sealed as in a broke spreader-although it is also possible to keep a sealing arrangement between the feed hopper and the drum, and also a packing or labyrinth seal can be considered.

In addition, in a method aspect, the invention also provides a water adding method of the drum pulper, which is characterized in that water is added through a water adding pipe and extends into the drum pulper.

In this way, the pulped water is directly injected or fed into the interior of the drum pulper without being fed through the feed hopper. The water of pulp is directly added into the first section or the second section of the rotary drum pulp crusher. Through this kind of mode, the pulped water can directly be absorbed by waste paper, also can solve the risk of revealing of sealed position to realize paper mill's clean production, and can reduce the energy consumption of rotary drum pulper simultaneously.

It will be understood that the above mentioned references both to the introduction of the water feed pipe inside the drum and to the supply of water inside the drum by means of jets, and therefore the present invention is intended to protect any solution in which the water is not introduced into the hopper, but rather into the drum, or even after a certain distance inside the drum, before coming into contact with the material. The way of feeding the water inside the drum is various and, besides adopting the solution described above of actually projecting the water feeding pipe inside the drum, it is also possible to consider a solution in which the end of the water feeding pipe does not project inside the drum, in which case the water feeding pipe is arranged and designed to be suitable for feeding water from outside the drum to inside the drum. Preferably, the water addition pipes can provide different injection pressures to inject water at different depths inside the drum. Regardless of the design and arrangement of the water-feeding pipes, it is important that the location of the introduction of water inside the drum, in an axial section of the feed end of said drum, is outside the contour enclosed by the trajectory of the material being lifted and thrown repeatedly. Whether by insertion of a filler pipe or direct injection of water, the purpose is to allow the disintegrated water to cross over rather than flow through the area between the stationary hopper and the rotating drum where sealing means are currently normally used.

In contrast, the person skilled in the art is on the one hand motivated by the fact that they have been working on how to mechanically perform the seal, including the use of different forms of seals, packings or packless labyrinth seals of different materials, etc.; on the other hand, the inertial thinking is that water is mixed with materials such as waste paper after being added from a feed inlet in the prior art, so that the skilled person does not know that the water can bypass a sealing area and enter a certain distance in the rotary drum. In contrast, the solution according to the invention, since a zone of the cross-section of the drum is found free of material, allows to inject the liquid material from this zone through the pressure in the conduit to a certain depth in the drum pulper. In addition, the technical scheme of the invention also skillfully utilizes the following facts: the waste paper and other materials are mainly subjected to bale breaking of the waste paper in a bale just after entering the rotary drum, and the bale breaking process can be carried out without water.

Drawings

Fig. 1 shows a drum pulper and a feed hopper assigned to it in a perspective view, the water feed pipe extending into the drum above the feed hopper;

FIG. 2 shows the overall structure of a drum pulper and feed hopper in side view;

FIG. 3 shows the feed hopper in isolation in perspective, where it can be seen that the end of the feed hopper has an end flange through which the filler pipe passes into the interior of the bowl;

FIG. 4 shows the feed hopper in isolation in a perspective view, in which it is seen that the end flange of the feed hopper has a notch, against which the filler pipe is arranged;

FIG. 5A shows, in a partially cut away perspective view, a drum pulper in accordance with one embodiment of the present invention, wherein a filler pipe extends through a feed hopper into the interior of the drum;

FIG. 5B shows, in a partially cut away perspective view, a drum pulper in accordance with one embodiment of the present invention, where a filler pipe extends into the interior of the drum through an end flange of the feed hopper;

FIG. 5C shows, in a partially cut away perspective view, a drum pulper in accordance with one embodiment of the present invention, wherein a water feed pipe is arranged opposite the gap of the end flange of the feed hopper, injecting water into the interior of the drum;

FIG. 6 shows, in schematic form, an axial cross-section of a drum feed end of a drum pulper, where the extent to which material is lifted and thrown is visible;

fig. 7 shows the distribution of the moisture content of the used paper after entering the drum in the axial direction of the drum.

Figure 8 shows in perspective a part of the drum and the feed end of the drum pulper.

Fig. 8A shows in a partly enlarged view a water feed pipe for feeding water from above the feed hopper, wherein material is fed from the feed hopper opening together with the disintegrated water.

Fig. 9 shows in a perspective view another arrangement of a prior art downcomer, in which the downcomer is inserted into the feed hopper from the side of the feed hopper and in which a number of outlet openings are provided.

Detailed Description

Fig. 1 and 2 show a drum pulper according to a first embodiment of the invention and a feed hopper associated therewith in a perspective view and in a side view, respectively, with a water feed pipe extending into the interior of the drum above the feed hopper. Fig. 3 shows in perspective the feed pipe through the feed hopper end flange. In fig. 3, the position of the water feed pipe on the cross-section of the drum where it enters the interior of the drum can be seen particularly clearly.

In this embodiment, as shown in figure 6, the material in the drum pulper is continuously lifted from the lowest point in the drum to approximately the 11 o ' clock position in figure 6 and then thrown to the 4-5 o ' clock position, so that there is no material in the 1-3 o ' clock position in figure 6, i.e. approximately the kidney-shaped area enclosed by the dash-dotted line in the figure, from which the water addition pipe extends into the interior of the drum. The additional arrows in fig. 6 show the direction of rotation of the drum and the trajectory of the fall of the material inside the drum, respectively.

Fig. 4 shows a second embodiment of the drum pulper according to the invention in a perspective view, in which the end flange of the feed hopper has a notch, the filler pipe is arranged opposite the notch but does not extend into the interior of the drum, and the water jet from the filler pipe can freely pass through the notch into the interior of the drum.

In a third embodiment of the drum pulper according to the invention, not shown, the filler pipe extends through the feed hopper into the interior of the drum. The difference from the first and second embodiments is that the filler pipe, since it extends inside the feed hopper, needs to be chosen appropriately at a higher level so as not to collide and interfere with the material fed into the feed hopper.

Fig. 5A, 5B show two variants of the first embodiment of the drum pulper according to the invention in a partly sectional view, respectively. In the embodiment variant shown in fig. 5A, two water addition pipes extend into the interior of the drum at different depths, so that water addition takes place at different depths in the interior of the drum. In the embodiment variant shown in fig. 5B, the water feed pipe extends substantially only a small distance past the end flange, but the emitted water stream can likewise reach different predetermined positions inside the drum due to the different outlet speeds and angles thereof. For example, the filler pipe is designed here with nozzles (not shown) whose cross-sectional area is variably adjustable, so that the water has different initial velocities upon entering the drum. The different initial velocities enable water to enter different depths inside the drum.

Similarly, water may be injected into the drum pulper without the end of the water pipe extending into the interior of the drum. Such an embodiment is shown in fig. 5C. In this embodiment, the water inlet is located at the drum inlet end at a position corresponding to the position of the water inlet tube extending into the drum inlet end in the embodiment described above in which the water inlet tube extends into the interior of the drum. Similarly to the embodiment variant of fig. 5B, in the embodiment of fig. 5C the ejected water flow is also able to reach different predetermined positions inside the bowl, again due to the difference in its outlet speed and angle. For the feed hopper and the water feed pipe, reference is made to the above description of the second embodiment, and also to fig. 4.

In another embodiment, the water adding pipe can penetrate through the end face flange of the feeding hopper from the side upper part of the feeding hopper to enter the rotary drum under the premise of avoiding the possible range of materials in the rotary drum. Although not shown in the drawings, it is clearly understood that the positions of the feed pipe insertion holes above the feed hopper side can be selected in conjunction with the falling trajectory of the material inside the drum, particularly the kidney-shaped region, shown in fig. 6.

The invention also relates to a water adding method of the drum pulper, which adopts the drum pulper, wherein water is directly added into the drum pulper through a water adding pipe without flowing through the feed hopper. The concrete implementation can refer to the concrete description of the structure of the water feeding pipe in the device embodiment.

Fig. 7 shows the distribution of the moisture content of the used paper after entering the drum in the axial direction of the drum. The water is fed directly into the interior of the drum pulper through the feed pipe, whereby the pulped water is diffused in both directions of the axis of the drum, the pulped water diffused in the opposite direction to the feed end is absorbed by the used paper moving from the feed end to the disintegration zone, and the water content of the used paper is gradually increased from the feed end to the feed point W of the water in the interior of the drum, and the water diffused in the feed end is absorbed by the incoming used paper before reaching the feed end. As shown, the wastepaper moisture content is 10% to 30% at the feed end of the drum pulper, where the moisture soaks into the wastepaper without forming free water and thus without leakage problems, and the wastepaper moisture content typically reaches 70% to 85% at the feed point W of the pulped water.

It will be appreciated that the embodiments described above are cited by way of example, and that the present invention is not limited to what has been particularly shown and described hereinabove. Rather, the scope of the present invention includes both combinations and subcombinations of the various features described hereinabove, as well as variations and modifications thereof which would occur to persons skilled in the art upon reading the foregoing description and which are not disclosed in the prior art. Documents incorporated by reference in this patent application are considered to be part of the present application and, if any terms are defined in these incorporated documents in a manner that conflicts with the concepts explicitly or implicitly defined in the present specification, only the definitions in the present specification should be considered. It is important that the water is not brought into contact with the material at the feed hopper, but rather after being introduced inside the drum, or even some distance inside the drum.

List of reference numerals

100 drum pulper

101 fragmentation zone

102 screening area

110 rotating drum

120 feed hopper

130 the feed end of the drum;

140 water adding pipe

150 end flange of feed hopper

160 gap of end flange

Claims

1. A drum pulper, comprising:

a drum; and

a feed hopper for inputting material to a feed end of the drum;

it is characterized in that the preparation method is characterized in that,

the drum pulper further comprises a water feeding pipe, said water feeding pipe being designed and adapted to feed water from the feed end of the drum directly into the interior of the disintegration zone of the drum without flowing through the feed hopper,

wherein, viewed in an axial section of the feed end of the drum, the water supplied by the water feed pipe enters the feed end of the drum at a position outside a contour defined by a motion trajectory of the material lifted along the circumference of the drum and thrown off at an upper portion of the feed end of the drum.

2. A drum pulper according to claim 1,

the end of the water feed pipe does not protrude into the interior of the drum, but is arranged and designed to be suitable for feeding water from the outside of the drum to the interior of the drum.

3. A drum pulper according to claim 1,

the water feeding pipe is arranged outside the feed hopper and extends into the rotary drum.

4. A drum pulper according to claim 1,

the water feeding pipe directly penetrates through the feed hopper and extends into the rotary drum.

5. A drum pulper according to any one of claims 1, 3 and 4,

the water feeding pipes are a plurality of water feeding pipes extending into the rotary drum at different depths.

6. A drum pulper according to any one of claims 1 to 4,

only one water adding pipe is arranged.

7. A drum pulper according to any one of claims 1 to 4,

the water feeding pipe is provided with a pipe orifice with adjustable sectional area change, so that water has different initial speeds when entering the rotary drum.

8. A drum pulper according to any one of claims 1 to 4,

the water feeding pipe is provided with a pipe orifice with an adjustable water outlet angle, so that water has different initial angles when entering the rotary drum.

9. A drum pulper according to any one of claims 1 to 4,

the feed hopper is connected with the rotary drum in a non-sealing mode.

10. A drum pulper according to any one of claims 1 to 4,

the feed hopper is connected with the rotary drum through packing seal or labyrinth seal.

11. A method of adding water to a drum pulper, using a drum pulper according to any one of claims 1 to 10, characterised in that water is fed directly into the interior of the drum pulper from the feed end of the drum through a water feed pipe without flowing through the feed hopper.