CN108330719B - Device for removing impurities from rotary drum pulper - Google Patents
Device for removing impurities from rotary drum pulper Download PDFInfo
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- CN108330719B CN108330719B CN201710045760.8A CN201710045760A CN108330719B CN 108330719 B CN108330719 B CN 108330719B CN 201710045760 A CN201710045760 A CN 201710045760A CN 108330719 B CN108330719 B CN 108330719B
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- pulp
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- 239000012535 impurity Substances 0.000 title claims abstract description 170
- 238000012216 screening Methods 0.000 claims abstract description 116
- 238000005192 partition Methods 0.000 claims abstract description 83
- 238000004537 pulping Methods 0.000 claims description 21
- 239000000835 fiber Substances 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 229920001131 Pulp (paper) Polymers 0.000 claims description 4
- 239000002657 fibrous material Substances 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 210000005056 cell body Anatomy 0.000 claims description 2
- 238000004891 communication Methods 0.000 abstract description 12
- 230000032258 transport Effects 0.000 description 31
- 239000000126 substance Substances 0.000 description 7
- 239000010893 paper waste Substances 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 238000004064 recycling Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000005549 size reduction Methods 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
The invention discloses a device for removing impurities from a rotary drum pulper, which comprises: a tank and an impurity transporting apparatus including a first end, a second end, and a moving member for moving impurities from the first end to the second end. The tank body comprises: the system includes a first partition, a second partition in communication with the first partition, and a housing surrounding the first partition and the second partition. The first section has an inlet end in communication with a discharge chute or screening zone. The first partition is of a frustum structure with an inlet end wider than an outlet of the first partition, and at least part of the second partition is of a frustum structure. A pulp outlet and an outlet end are provided in the housing surrounding the second compartment. The impurity transporting device is a longitudinal conveying device which is surrounded in the housing and is positioned in the second partition, the first end of the impurity transporting device is arranged at the lowest end of the frustum structure of the second partition, the second end is higher than the outlet end, the outlet end is higher than the first end and the pulp in the tank body, and the pulp outlet is higher than the first end but lower than the outlet end.
Description
Technical Field
The present invention relates to a device for removing impurities from a pulper, in particular from a discharge chute or screening zone of a rotary drum pulper. The invention also relates to a rotary drum pulper with a screening zone of frustoconical construction.
Background
A drum pulper is an apparatus for pulping waste paper used in the papermaking field. The waste paper enters the rotary drum from the feeding area, the rotary drum can be divided into a pulp crushing area and a screening area, and the waste paper is treated in the pulp crushing area of the rotary drum to separate the waste paper into fibers to form paper pulp. The drum is constantly rotating and is slightly inclined, and the pulp advances through the pulp crushing zone along the inclination angle into the screening zone. The pulp is diluted in the screening area and enters the discharge chute through the sieve holes of the screening area, and the light and heavy impurities are backflushed back into the rotary drum and continuously move forward to be discharged at the tail end of the rotary drum. While most of the impurities are discharged through the end of the drum, some of the impurities enter the discharge chute with the pulp. Cleaning impurities in the discharge chute is a time-consuming and labor-consuming process. At present, there is a need to develop a more convenient, efficient and economical method and apparatus for removing impurities from a discharge chute. In addition, the screening efficiency of the screening zone of the current drum needs to be improved.
Disclosure of Invention
The invention provides a device for removing impurities from a rotary drum pulper, which is characterized in that the device comprises: a tank for receiving pulp containing impurities; and an impurity transporting device. The impurity transporting apparatus includes a first end, a second end, and a moving member that moves the impurity from the first end to the second end. The cell body includes: the first partition, the second partition, and a housing surrounding the first partition and the second partition. The first section has an inlet end in communication with a discharge chute or screening zone of the rotary drum pulper. The first partition communicates with the second partition through a first partition outlet. Pulp falls from the drum into the first zone and then into the second zone. The first subarea is of a frustum structure with an upper wide and a lower narrow inlet end wider than an outlet of the first subarea. At least part of the second partition is in a frustum structure. In one embodiment, at least a portion of the structure of the second partition is a wide-top, narrow-bottom frustum structure. A pulp outlet and an outlet end are provided in the housing surrounding the second compartment. The impurity transporting means is an elongated conveyor means enclosed in the housing and located in the second section, the first end of which is arranged at the lowest end of the frustum structure of the second section, the second end being higher than the outlet end, which is higher than the first end and the pulp level in the tank, the pulp outlet being higher than the first end but lower than the outlet end, so that the fibers in the pulp are discharged from the pulp outlet for recovery and impurities sinking in the second section fall at the first end and are transported in the direction of the second end to be discharged from the outlet end. In one embodiment, the outlet end is higher than the inlet end of the first partition.
In one embodiment, the second section of the apparatus may further comprise one or more additional impurity transport means. The additional impurity conveying device conveys the received impurities to the impurity conveying device which is also positioned in the second partition, so that the impurity discharging efficiency is improved. The additional impurity transporting device is supported by the outer cover in the whole length, and the length of the additional impurity transporting device is larger than the diameter of the outlet of the first partition, so that impurities are conveyed to the impurity transporting device through the additional impurity transporting device. The additional impurity transporting means is perpendicular to the impurity transporting means.
In another aspect, the invention provides a rotary drum pulper comprising a rotary drum comprising a pulping section and a screening section configured at least in part as a frustum.
In one embodiment, the screening area at least partially configured as a frustum may be connected to or in communication with the trough body of the present invention or through a discharge chute. In another embodiment, the screening zone at least partially configured as a frustum may replace the screening zone in an existing rotating drum.
Drawings
Fig. 1 (a) in fig. 1 shows a drum pulper of one embodiment, and fig. 1 (B) shows a drum pulper of another embodiment.
Fig. 2 shows an apparatus for removing foreign substances from a drum pulper according to an embodiment, fig. 2 (a) is a side view of the apparatus, fig. 2 (B) is a front view of the apparatus, and fig. 2 (C) is a top view of the apparatus.
Fig. 3 shows another embodiment of the apparatus for removing foreign substances from a drum pulper, fig. 3 (a) is a side view of the apparatus, fig. 3 (B) is a front view of the apparatus, and fig. 3 (C) is a top view of the apparatus.
Fig. 4 shows another embodiment of the apparatus for removing foreign substances from a drum pulper, fig. 4 (a) is a side view of the apparatus, fig. 4 (B) is a front view of the apparatus, and fig. 4 (C) is a top view of the apparatus.
Fig. 5 shows another embodiment of the apparatus for removing foreign substances from a drum pulper, fig. 5 (a) is a side view of the apparatus, fig. 5 (B) is a front view of the apparatus, and fig. 5 (C) is a top view of the apparatus.
Fig. 6 shows another embodiment of the apparatus for removing foreign substances from a drum pulper, fig. 6 (a) is a side view of the apparatus, fig. 6 (B) is a front view of the apparatus, and fig. 6 (C) is a top view of the apparatus.
Fig. 7 shows another embodiment of the apparatus for removing foreign substances from a drum pulper, fig. 7 (a) is a side view of the apparatus, fig. 7 (B) is a front view of the apparatus, and fig. 7 (C) is a top view of the apparatus.
Fig. 8 (a) of fig. 8 shows a drum including a pulp crushing zone and a screening zone of a frustum structure according to one embodiment, and fig. 8 (B) shows that the pulp crushing zone and the screening zone of the frustum structure may be two-stage split.
Fig. 9 (a) of fig. 9 shows another embodiment of a drum including a pulp crushing zone and a screening zone of a frustum structure, and fig. 9 (B) shows that the pulp crushing zone and the screening zone of the frustum structure may be two-stage split.
Fig. 10 (a) of fig. 10 shows another embodiment of a drum including a pulp crushing zone and a screening zone of a frustum structure, and fig. 10 (B) shows that the pulp crushing zone and the screening zone of the frustum structure may be two-stage split.
Detailed Description
As used herein and in the claims, "comprising" means including but not excluding other elements.
As used herein, "tank" refers to any container that can hold liquids, solids, or gases.
As used herein, "screw conveyor" refers to a transport device that transports objects, particularly solids, from one end to the other by rotation of a screw.
As used herein, a "belt conveyor" refers to a transport device that transports objects, particularly solids, from one end to the other by movement of a belt.
As used herein, "moving component" refers to a component of a transport device that transports an object from one end to the other and that moves or rotates.
As used herein, "connected" includes both physical contact and physical non-contact connections. For example, for a "screening zone in which the discharge chute is connected to the drum", the discharge chute need not necessarily contact the screening zone in which the drum is connected, but rather the discharge chute is located below the screening zone of the rotating drum such that pulp from the screening zone may be received by the discharge chute. For example, for a "screening zone of a trough-connected drum", the trough does not necessarily contact the screening zone of the connected drum, and the trough is positioned below the screening zone of the rotating drum such that pulp from the screening zone is received by the trough.
As used herein, "frustum" refers to the solid between two parallel planes of a cone or pyramid after it has been truncated by the two parallel planes. The "upper wide-lower narrow-type frustum" refers to a frustum whose diameter or width of the upper surface is larger than that of the lower surface.
Fig. 1 (a) in fig. 1 shows a rotary drum pulper. The drum pulper 100 comprises a loading zone 102, a drum 104, and a discharge chute 106. The drum 104 includes a pulp crushing zone 108 and a screening zone 110. The discharge chute 106 is connected to a screening zone 110 of the drum. Most of the impurities exit from the end 112 of the drum and the pulp passes through the screen openings 114 into the discharge chute 106 in the screening zone, but some of the impurities, such as sand, glass, wire, etc., enter the discharge chute with the pulp. The drum 104 may be integral with the size reduction zone 108 and the screening zone 110, or may be two separate sections of the size reduction zone 108 and the screening zone 110 as shown in fig. 1 (B).
The pulping zone and the screening zone of the drum may be in one drum or in two separate drums. Scraping plates can be arranged on the inner walls of the pulp crushing area and the screening area of the rotary drum, and the pulp is repeatedly thrown to a certain height and falls down and collides with the inner wall surface of the rotary drum. In this way, the waste paper is separated into fibers, foreign substances and films, plastics, gravel, broken cloth, etc. without being broken due to the generation of gentle and effective shearing force and the enhancement of friction between fibers.
One embodiment of the invention relates to an apparatus for removing impurities from a rotary drum pulper. The apparatus comprises a chute and an impurity conveyor, which may be connected to the bottom of the discharge chute such that pulp falls from the discharge chute into the chute, in other words the chute is an extension or expansion of the discharge chute. Or the vat may be connected to the screening area of the drum without the need for a discharge chute to allow pulp to fall from the screening area into the vat. The tank includes a first section, a second section, and a housing. The first section has an inlet end in communication with a discharge chute or screening zone and the second section is in communication with the first section, and the housing surrounds the first section and the second section. The first partition is of an upper-wide and lower-narrow frustum structure, and at least part of the second partition is of an upper-wide and lower-narrow frustum structure. A pulp outlet and an outlet end are provided in the cover part surrounding the second partition. The impurity transporting apparatus includes a first end, a second end, and a moving member that moves the impurity from the first end to the second end. The impurity transporting means is enclosed within the housing, located within the second section, and is an elongated conveyor. The fibers in the pulp are lighter and the impurities are heavier, so that the impurities are deposited at the bottom of the vat. The first end is arranged at the lowest end of the frustum structure of the second partition, the second end is higher than the outlet end, the outlet end is higher than the first end and the pulp in the tank body, and the pulp outlet is higher than the first end but lower than the outlet end. The design is such that the fibres in the pulp are discharged from the pulp outlet for recycling and impurities sinking to the second section fall at the first end and are transported in the direction of the second end. The second end is adjacent the outlet end from which impurities can be discharged when transported in the direction of the second end.
The first partition and the second partition of the tank body are respectively provided with an upper wide and lower narrow frustum structure, so that paper pulp is easier to sink from the first partition to the second partition, impurities are easier to sink at the first end of the impurity conveying device positioned at the lowest end of the frustum structure of the second partition, and impurities are easier to discharge. The high design of the first end, the second end, the pulp outlet and the outlet end of the impurity conveying device also enables the fibers in the pulp to be recovered more easily, and impurities are discharged more effectively.
Another embodiment of the invention relates to an improvement in the screening zone of a rotary drum pulper. The conventional screening zone is cylindrical. At least a portion of the screening zone of the drum of one embodiment of the present invention is configured as a frustum, with the proximal end of the screening zone proximate the pulping zone having a greater diameter than the distal end of the screening zone distal the pulping zone. Pulp enters the screening zone after being treated in the shredding zone, more pulp accumulates at the near end of the screening zone. The proximal end of the screening zone has more openings and larger diameters than the distal end of the screening zone remote from the pulping zone, so that more pulp flows out of the proximal end of the screening zone and into a discharge chute or other body and more impurities move toward the distal end of the screening zone. When the pulp flows from the near end of the screening area to the far end of the screening area, the fiber content is lower and lower, and the screening of the pulp can be completed by fewer sieve holes. Therefore, the frustum structure of the screening area not only can more effectively complete the screening work of paper pulp, but also lightens the weight of the traditional screening area. The frustum design enables the screening efficiency of the screening area to be higher. The far end of the screening zone with smaller diameter also increases the rigidity of the end of the drum and also reduces the impact force of impurities falling into the drum. The distal end of the smaller diameter screening zone also has a smaller moment of inertia, thereby making the drum less energy-consuming. The screening zone with at least part of the structure of the frustum can independently replace the screening zone of the traditional rotary drum pulper, and can also be applied to the device for removing impurities from the rotary drum pulper.
As shown in fig. 2 (a), (B), and (C), the apparatus 200 includes a tank 202 and an impurity transporting apparatus 210. The tank 202 includes a first section 216, a second section 218, and an outer housing 204. The first section 216 has an inlet end 206 in communication with a screening zone or discharge chute of the drum pulper, the inlet end 206 being operable to receive pulp. The first partition 216 is connected or in communication with the second partition 218 through a first partition outlet 224. The housing 204 surrounds a first section 216 and a second section 218. The first partition 216 is a frustum structure. The width of the inlet end 206 is greater than the width of the first partition outlet 224. The second section 218 also has a frustum structure 219. The frustum structure 219 is a frustum with a wide upper part and a narrow lower part. The impurity transport device 210 is enclosed by the housing in the second zone and is an elongated conveyor. The impurity transporting apparatus 210 has a first end 212 and a second end 214 and moving parts that transport impurities from the first end to the second end. The first end 212 is at the lowest end of the frustoconical structure 219 of the second partition. A pulp outlet 220 and an outlet end 208 are provided on the housing surrounding the second compartment. After entering the first section 216 of the tank, the pulp enters the second section 218, and because the fibers are lighter in the upper layer and the impurities are heavier and tend to settle to the bottom, the recyclable fibers exit the tank for recycling through the pulp outlet 220. Impurities deposited at the bottom fall to the first end 212 of the impurity transport device and are transported to the second end 214 for discharge from the outlet end 208. The first end 212 is arranged at the lowest end of the second partition, the second end 214 is higher than the outlet end 208, the outlet end 208 is higher than the first end 212 and the pulp level in the tank, the pulp outlet 220 is higher than the first end 212 but lower than the outlet end 208, so that the fibers in the pulp are discharged from the pulp outlet 220 for recycling and the impurities sunk in the second partition fall at the first end 212 and are transported towards the second end 214 for discharge from the outlet end 208.
In one embodiment, the vat 202 is partially substituted for a conventional or existing discharge chute and is connected or in communication with the screening zone 110 of the drum via inlet end 206 such that pulp passing through the openings of the screening zone enters the vat 202 from the drum. In another embodiment, the trough 202 may be connected or connected to the bottom of one of the discharge troughs 106 via inlet end 206, with pulp entering the discharge trough through the screen openings and then entering the trough via the discharge trough. In one embodiment, the trough 202 is positioned below the screening zone of the drum and receives pulp from the screening zone, and the trough may not be in direct contact with the screening zone of the drum. In another embodiment, the discharge chute 106 is located below the screening area of the drum, and the discharge chute may not be in direct contact with the screening area of the drum, and the chute body 202 is located below the discharge chute such that pulp falls from the screening area into the discharge chute and into the chute body.
The first wall 222 of the first partition 216 extends from the inlet end 206 to the first partition outlet 224, at least a portion of the first wall 222 narrows toward the first partition outlet 224 at first and second angles of inclination a and B, respectively, as shown in fig. 2 (B). The frustoconical structure of the first partition has a proximal end 230 and a distal end 232, a first angle of inclination a on the proximal end 230 side and a second angle of inclination B on the distal end 232 side. In one embodiment, the first tilt angle a is equal to the second tilt angle B. In another embodiment, the first tilt angle a is greater than the second tilt angle B, the first tilt angle a is less than 80 °, and the second tilt angle B is less than 60 °.
The impurity transporting device, the pulp outlet and the outlet end are arranged in the second partition. In one embodiment, the first end of the impurity transporting means is located at the lowermost end of the second section. In a preferred embodiment, the first end of the impurity transporting device is located at the lowest end of the second segmented frustum structure. In another embodiment, the impurity transporting device is a screw conveyor or a belt conveyor.
As shown in fig. 2 (B), the impurity transporting apparatus 210 makes an angle α with respect to the horizontal plane a of the inlet end 206, which may be an acute angle. As shown in fig. 2 (C), a stirrer 215 may be provided in the tank 202 to stir the pulp containing the impurities, facilitate recovery of the recyclable fiber out of the tank 202, and transport the impurities to the outlet end 208 while sinking to the first end 212 of the impurity transport means.
The second partition 218 may be divided into a first chamber 226 and a second chamber 228. As shown in FIG. 2, the first chamber 226 is connected or in communication with the first partition 216 through the first partition outlet 224 and the second chamber 228 is connected with the first partition through the first chamber 226. The pulp outlet 220 is located in the first chamber and the impurity transport device 210 is located in the second chamber 228. The second chamber is of a frustum structure with a wide upper part and a narrow lower part. The first chamber may also have a frustoconical configuration with a wide top and a narrow bottom. The second chamber is connected to the end of the first chamber near the proximal end 230 such that pulp falling from both the proximal and distal ends enters the second chamber through the end of the first chamber near the proximal end.
In one embodiment, the tank may include at least one additional impurity transport device. As in the embodiment shown in the apparatus 300 of fig. 3 (a), (B), (C), the tank 202 includes two additional impurity transport devices 310 and 312 enclosed within a housing, each having a third end 313 (a) and a fourth end 313 (B). The third end 313 (a) moves the impurity toward the fourth end 313 (b), from which the impurity is transferred to the first end 212 of the impurity transporter 210. The overall length of the additional impurity transport devices 310 and 312 are supported by the housing 204, which supports the additional impurity transport devices in part as a substrate 314. The length of the additional impurity transport device 310 and/or 312 along the third to fourth end direction is greater than the width or diameter of the first partition exit 224. The fourth end has a height lower than the pulp outlet and higher than the first end 212. Pulp passes through the first zone to the second zone, and recoverable fibers in the pulp exit the tank through pulp outlet 220, where impurities settle in the additional impurity transport means. The additional impurity transporting apparatuses 310 and 312 transport the impurities to the impurity transporting apparatus 210 again to discharge the tank. In one embodiment, the third and fourth ends of each additional impurity transport device are horizontal. In another embodiment, the additional impurity transport device 310 and/or 312 may be parallel to the first zone outlet 224, or the first zone outlet may be angled but the height of the lower end of the additional impurity transport device 310 and/or 312 is lower than the height of the pulp outlet. In another embodiment, two additional impurity conveyors 310 and 312 are parallel to each other and perpendicular to impurity conveyor 210.
The housing of the tank has an injector opening 316 and an injector 318 is positioned in the injector opening 316 to inject the impurity as it is transported from the first end 212 toward the second end 214. In one embodiment, the injector opening 316 is disposed proximate the second end 214. In another embodiment, the height of the injector opening 316 is greater than the height of the end 212 but less than the height of the outlet end 208.
In one embodiment, the second partition further includes a third chamber 320 that connects or communicates with the first chamber 226 and the second chamber 228. Two additional impurity transporting apparatuses are located in the third chamber 320, and after the impurities enter the first chamber, the impurities are deposited in the third chamber by the additional impurity transporting apparatuses 310 and 312 and transported to the second chamber by the additional impurity transporting apparatuses 310 and 312, so that the impurities are deposited in the first end 212 of the impurity transporting apparatus. In one embodiment, the third chamber in which the two additional impurity transport devices are located is connected or in communication with the end of the first chamber near the proximal end 230 and is connected or in communication with the end of the first chamber near the distal end 232.
As shown in fig. 4 (a), (B), and (C), the apparatus 400 has an additional impurity transporting device 310 disposed on a substrate 314 and supported by the substrate 314, the substrate 314 being a part of a housing. From the first zone the pulp passes to the second zone, from where the fibers are discharged from the pulp outlet 220, and the impurities sink onto the additional impurity transport means 310 of the second zone and are transported by the additional impurity transport means 310 from the third end 313 (a) to the fourth end 313 (b). The impurities are transported from the fourth end to the first end 212 of the impurity transport means 210, which is also located in the second section, and from the first end to the second end 214 so that the outlet end 208 is discharged. In one embodiment, the additional impurity transport device 310 is perpendicular to the impurity transport device 210. In one embodiment, the additional impurity transporting means is a screw conveyor or a belt conveyor
As shown in fig. 4, a third chamber 320 of the second partition connects or communicates with the first chamber 226 and the second chamber 228, and an additional impurity transporting device 310 is located in the third chamber 320. Pulp enters the third chamber from the first chamber, fibers are discharged through the pulp outlet 220, impurities fall on an additional impurity transporting device, and are transported from the third end 313 (a) to the fourth end 313 (b) to enable the impurities to fall into the second chamber, and the impurities of the impurity transporting device settled in the second chamber are continuously discharged out of the tank body. In one embodiment, an additional impurity transport device is positioned in the third chamber that connects or communicates with the end of the first chamber near the proximal end 230 or the end of the first chamber near the distal end 232.
The design of the additional impurity transport means in fig. 3 and 4 allows impurities to be more effectively discharged from the tank.
As shown in fig. 5 (a), (B) and (C), after the impurities are discharged from the outlet 510 of the tank, a sand-water separator 512 is connected. An overflow pipe 514 is connected between the sand-water separator 512 and the tank 202, and the impurities are rinsed by the liquid from the sand-water separator 512, which recovers the fibrous material from the impurities and leaves the overflow pipe 514 back to the tank 202.
The shapes of the first partition and the second partition of the tank body and the positions of the impurity conveying devices in the second partition are variable, so long as the first partition and the second partition are both provided with a frustum structure, the first end of the impurity conveying device is at the lowest end of the second partition, and therefore impurities entering the second partition through the first partition are sunk at the first end of the impurity conveying device in the second partition, and are conveyed to the direction of the second end. For example, as in the embodiment shown in fig. 5 (a) and (B), a side view of the first section 216 shows the first section as a frustum. The second partial structure is an asymmetric frustum structure 516, and the first end 212 of the impurity transporting apparatus 210 is located at the lowest end of the asymmetric frustum structure 516. As shown in fig. 6 (a), (B) and (C), the part of the second partition is a symmetrical frustum structure 610, and the first end 212 of the impurity transporting apparatus 210 is located at the lowest end of the symmetrical frustum structure 610, and the impurity transporting apparatus 210 is not closely attached to the housing 204 of the tank body. As shown in fig. 7 (a), (B) and (C), the portion of the second partition has an asymmetric frustum structure 716, the first end 212 of the impurity transporting apparatus 210 is located at the lowest end 716 of the asymmetric frustum structure, and the impurity transporting apparatus 210 is closely attached to the housing 204 of the tank body.
Fig. 2 to 7 show different embodiments of the apparatus for removing impurities from a drum pulper. The same structure has the same function, and each of the same structure and its function will not be described in detail in different embodiments.
Fig. 8 (a) of fig. 8 shows an embodiment of a drum 800, the drum 800 comprising a pulp crushing zone 802 and a screening zone 804. The screening zone has screen holes 806. The screening zone has two ends, one end being the proximal end 808 of the screening zone adjacent the pulp crushing zone and the other end being the distal end 810 of the screening zone remote from the pulp crushing zone. The proximal end 808 of the screening zone, which is closer to the pulping zone, is of greater diameter than the distal end 810 of the screening zone, which is farther from the pulping zone. The proximal end 808 of the screening zone near the pulping zone has more screen holes 806 than the distal end 810 of the screening zone remote from the pulping zone. As shown in fig. 8 (a), the outer wall 809 near the proximal end 808 of the screening zone of the pulping zone narrows in a frustoconical configuration, then tapers parallel to the distal end 810 of the screening zone away from the pulping zone. The pulping section 802 and the screening section 804 of the drum may be integrated, or the pulping section 802 and the screening section 804 may be separated as shown in fig. 8 (B).
The drum 900 shown in fig. 9 (a) of fig. 9 has a screening zone 904 and a pulp crushing zone 902 of a frustoconical configuration. The diameter of the proximal end 908 of the screening zone near the crushing zone is greater than the diameter of the distal end 910 of the screening zone remote from the crushing zone. The proximal end 908 of the screening zone near the pulping zone has more screen apertures 906 than the distal end 910 of the screening zone remote from the pulping zone. The outer wall 909 proximate the screening zone proximal end 908 of the crushing zone tapers to a distal end 910 of the screening zone distal to the crushing zone in a frustoconical configuration. The pulping section 902 and the screening section 904 of the drum may be integrated, or the pulping section 902 and the screening section 904 may be separated as shown in fig. 9 (B).
Fig. 10 (a) of fig. 10 shows a screening area 1004 of another embodiment of a frustum structure. Drum 1000 has a pulp crushing zone 1002 and a screening zone 1004. The proximal end 1008 of the screening zone near the crushing zone is of a larger diameter than the distal end 1010 of the screening zone remote from the crushing zone. The proximal end 1008 of the screening zone near the shredding zone has more screen holes 1006 than the distal end 1010 of the screening zone remote from the shredding zone. As shown in fig. 10, the outer wall 1009 of the screening zone proximal end 1008 of the crushing zone tapers into a frustoconical configuration and may continue to taper into another frustoconical configuration of smaller diameter in a direction toward the distal end 1010 of the screening zone distal from the crushing zone. The pulping section 1002 and the screening section 1004 of the drum may be integrated, or may be separated from each other as shown in fig. 10 (B).
Fig. 8-10 illustrate various embodiments of screening zones having at least one frustum configuration. As shown in fig. 8-10, the frustum structure of the screening zone may vary and may include more than one frustum structure, but the screening zone of the present invention may be effective if the screening zone is partially frustoconical, having a larger diameter at the proximal end of the screening zone near the shredding zone than the distal end of the screening zone remote from the shredding zone, with more openings. The screening zone of the frustoconical configuration of fig. 8-10 can be applied to the apparatus of fig. 2-7 for removing impurities from a rotary drum pulper or can be used independently to replace the screening zone of an existing rotary drum.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, the preferred methods, materials, and devices are now described.
The practice of the invention is illustrated in non-limiting examples. The scope of the invention is limited only by the appended claims, which are in no way limited by the contents or scope of the embodiments.
Claims (17)
1. An apparatus for removing impurities from a rotary drum pulper, the screening zone of the rotary drum pulper having a proximal end proximal to the pulping zone and a distal end distal to the pulping zone, the apparatus comprising:
a tank for receiving pulp containing impurities; and
a means for transporting the impurities, said means for transporting the impurities comprising a first end, a second end and a moving member for moving the impurities from the first end to the second end,
wherein, the cell body includes: a first partition having an inlet end communicating with a discharge chute or screening area of said drum pulper, a second partition communicating with said first partition, and a housing surrounding said first partition and said second partition,
wherein the first partition is communicated with the second partition through a first partition outlet, the first partition is of a frustum structure with the inlet end wider than the outlet of the first partition, at least part of the second partition is of a frustum structure, a paper pulp outlet and an outlet end are arranged on the outer cover surrounding the second partition,
said impurity transporting means being an elongated conveyor means enclosed within said housing and located within said second section, said first end being disposed at the lowermost end of the frustum structure of said second section, said second end being higher than said outlet end, said outlet end being higher than the pulp level in said first end and said trough, said pulp outlet located in said second section being higher than said first end but lower than said outlet end, such that fibers in the pulp are discharged from said pulp outlet for recovery and settling of said impurities in said second section at said first end and transported in a direction towards said second end for discharge from said outlet end,
wherein the second partition is divided into a first chamber and a second chamber, the first chamber is connected with the first partition through a first partition outlet, the second chamber is connected with the first partition through the first chamber, the pulp outlet is positioned in the first chamber, the impurity conveying device is positioned in the second chamber,
wherein the second chamber is connected to an end of the first chamber near the proximal end such that pulp falling from both the proximal and distal ends enters the second chamber through the end of the first chamber near the proximal end,
wherein the impurity transporting device is a screw conveyor or a belt conveyor.
2. The apparatus for removing impurities from a rotary drum pulper of claim 1, further comprising one or more additional impurity transporting means, wherein said additional impurity transporting means is located within said second section thereof and is further enclosed within said housing and has a third end and a fourth end, said third end moving said impurities toward said fourth end and from said fourth end to said first end of said impurity transporting means.
3. The apparatus for removing foreign matters from a drum pulper according to claim 2, wherein the total length of the additional foreign matters transporting means is supported by the housing, and the length of the additional foreign matters transporting means in the directions of the third and fourth ends is greater than the width of the first partition outlet.
4. The apparatus for removing impurities from a rotary drum pulper according to claim 2, wherein the fourth end has a height lower than the height of the pulp outlet and higher than the height of the first end.
5. The apparatus for removing impurities from a rotary drum pulper of claim 2, wherein said third end and said fourth end are horizontal.
6. The apparatus for removing impurities from a rotary drum pulper according to claim 2, wherein the additional impurity transporting means is perpendicular to the impurity transporting means.
7. The apparatus for removing impurities from a rotary drum pulper according to claim 2, characterized in that the apparatus comprises two additional impurity transporting means, which are parallel to each other and perpendicular to the impurity transporting means.
8. The apparatus for removing impurities from a drum pulper according to claim 1, wherein an ejector is provided on an ejector opening of said housing so as to eject said impurities as they are transported from said first end to said second end, said impurities being rinsed by liquid ejected by said ejector, said liquid recovering fibrous material from said impurities and flowing back into said tank.
9. The apparatus for removing impurities from a rotary drum pulper of claim 1, wherein the first zoned frustum structure and the second zoned frustum structure are wide-top, narrow-bottom frustum structures.
10. The apparatus for removing impurities from a rotary drum pulper according to any one of claims 2 to 7, characterized in that the additional impurity transporting means is a screw conveyor or a belt conveyor.
11. The apparatus for removing impurities from a rotary drum pulper according to claim 1, further comprising:
a sand-water separator for receiving the impurities discharged from the impurity transporting means;
an overflow pipe connecting the sand-water separator and the tank, wherein the impurities are rinsed by liquid from the sand-water separator, which liquid recovers fibrous material from the impurities and flows back from the overflow pipe to the tank.
12. The apparatus for removing impurities from a rotary drum pulper of claim 1, wherein said second chamber is said frustum structure of said second partition.
13. The apparatus for removing impurities from a rotary drum pulper of claim 12, wherein the first wall of the frustum structure of the first partition narrows toward the first partition outlet, forming a first angle of inclination on the proximal side and a second angle of inclination on the distal side, the first angle of inclination being greater than the second angle of inclination, the first angle of inclination being less than 80 ° and the second angle of inclination being less than 60 °.
14. The apparatus for removing impurities from a rotary drum pulper of claim 2, wherein said second partition further comprises a third chamber connecting said first chamber with said second chamber, said additional impurity transporting means being located in said third chamber, said impurities being deposited on said additional impurity transporting means of said third chamber after entering said first chamber, and being transported to said second chamber via said additional impurity transporting means, whereby said impurities are deposited on said first end of said impurity transporting means.
15. A drum pulper comprising the apparatus of claim 1 and a drum, characterized in that said drum comprises a pulp crushing zone and a screening zone at least partially configured as a frustum.
16. A drum pulper according to claim 15, wherein the diameter of the proximal end of the screening zone is greater than the diameter of the distal end of the screening zone.
17. A drum pulper according to claim 16, wherein the proximal end of the screening zone has more mesh than the distal end of the screening zone.
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| FI129925B (en) | 2021-05-25 | 2022-11-15 | Andritz Oy | An accept tank mixing arrangement |
| CN114470965A (en) * | 2022-01-20 | 2022-05-13 | 安德里茨（中国）有限公司 | Heavy matter separator |
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