A pulping system for improving pulp beating degree and its production process

Abstract

The present application relates to a pulping system and a production process thereof for improving the beating degree of pulp, and relates to the field of papermaking pulping technology, which includes a pulper, a desander, a buffer pulp tower, a pre-beating pulp pool, a disc grinding pulper and a post-beating pulp pool which are sequentially connected through pipelines, and the buffer pulp tower includes a tower body, a partition and a driving member, the partition divides the tower body into a plurality of pulp storage chambers, the driving member is used to drive the partition to rotate, and the side wall of the tower body is fixedly connected to two adjacent pulp storage chambers with a feed pipe and a discharge pipe. The present application allows the pulp to be stored and retained in the buffer pulp tower, so that the fibers in the pulp can be fully moistened, and then the disc grinding effect on the pulp can be more easily improved during the subsequent disc grinding and pulping, which is beneficial to improving the beating degree of the pulp after beating, and the paper made of pulp has better tear resistance, and the amount of chemical auxiliary materials used can be reduced in subsequent operations, thereby reducing the production cost of paper.

Description

Technical Field

[0001] The present application relates to the field of papermaking pulping technology, and in particular to a pulping system for improving the pulp beating degree and a production process thereof. Background Art

[0002] The beating degree is the beating degree. It refers to the effect of the pulping process after the reaction pulp passes through the pulping machine, such as the fiber being cut, split, swollen, and hydrated. The representative symbol is °SR.

[0003] In the existing waste paper pulping line, the pulping section is that the wood pulp board is crushed by the wood pulper, and then passed through the high-concentration desander to a fore-beating tank, and then pumped to two 1400KW double-disc refiners for series beating. After passing through the disc refiners, the pulp is sent to the post-beating tank, and finally sent to the pulping tank for the paper machine to make paper.

[0004] Normally, the beating degree of wood pulp before beating is 15°SR. After two 1400KW disc refiners, the power is loaded to a maximum of 1250KW, and the beating degree can reach 35°SR at most. In actual production, the beating degree often needs to reach about 40°SR to meet the production process requirements. Otherwise, the paper has poor tear resistance, which leads to a large amount of chemical auxiliary materials in the subsequent process, resulting in high production costs.

[0005] With respect to the above-mentioned related technologies, the inventors believe that the beating degree of the pulp after pulping in the related technologies does not meet the production requirements, resulting in a large amount of chemical auxiliary materials used in the subsequent processes, leading to high production costs. Summary of the invention

[0006] In order to improve the beating degree of pulp after beating, the present application provides a pulping system and a production process thereof for improving the beating degree of pulp.

[0007] In the first aspect, the present application provides a pulping system for improving the pulp beating degree, which adopts the following technical solutions:

[0008] A pulping system for improving the beating degree of pulp comprises a pulper, a desander, a buffer pulp tower, a pre-beating pulp tank, a disc-beating pulper and a post-beating pulp tank which are sequentially connected through pipelines.

[0009] By adopting the above technical scheme, a buffer pulp tower is added after the desander. After the buffer pulp tower is filled with pulp, the buffer pulp tower can buffer the pulp required for the production process for 3 hours. The pulp is continuously injected into the buffer pulp tower, so that the pulp can be stored in the buffer pulp tower for 3 hours, and the fibers in the pulp can be fully swelled. Then, during the subsequent disc grinding and pulping, it is easier to improve the disc grinding effect on the pulp, which is beneficial to improve the beating degree of the pulp after pulping. After disc grinding and pulping, the beating degree of the pulp can reach 38°SR, and the paper made from the pulp has good tear resistance. The amount of chemical auxiliary materials used can be reduced in subsequent operations, thereby reducing the production cost of paper.

[0010] Optionally, the buffer slurry tower includes a tower body, a partition and a driving member, the partition divides the tower body into a plurality of slurry storage chambers, the driving member is used to drive the partition to rotate, and the side wall of the tower body is fixedly connected to two adjacent slurry storage chambers with a feed pipe and a discharge pipe.

[0011] By adopting the above technical solution, the tower body is divided into multiple pulp storage chambers by a partition. During the production process, the driving member drives the partition to rotate, thereby driving the pulp storage chamber to change position. When a pulp storage chamber is filled with pulp through the feed pipe, as the driving member drives the partition to move, the pulp storage chamber can be moved from the feed pipe to the discharge pipe, and then the pulp is discharged. Through the above structure, the pulp can be soaked and swelled during the movement of the pulp storage chamber, and the pulp that enters the buffer pulp tower later can be prevented from flowing out through the discharge pipe before the pulp that enters the buffer pulp tower earlier, so that the pulp that enters the buffer pulp tower can be fully swelled for 3 hours, which is beneficial to improve the beating degree of the pulp after beating.

[0012] Optionally, the partition includes a rotating shaft and a plurality of partitions, the rotating shaft is coaxially rotatably connected to the tower body, the plurality of partitions are evenly distributed along the circumference of the rotating shaft, one side of the partition is axially fixedly connected to the rotating shaft along the long side, the side of the partition away from the rotating shaft abuts against the inner wall of the tower body, and the driving member is used to drive the rotating shaft to rotate.

[0013] By adopting the above technical solution, when working, the driving member is started, and the driving member drives the rotating shaft to rotate. When the rotating shaft rotates, it drives the partition connected to it to rotate, and then drives the position of the pulp storage chamber to move, so that the pulp storage chamber can be moved from the feed pipe to the discharge pipe, and then the material is discharged. The above partition is convenient for dividing the tower body into multiple pulp storage chambers, and the position of the pulp storage chamber can be changed as the rotating shaft drives the partition to rotate, so that the pulp is fully swelled in the pulp storage chamber and then discharged through the discharge pipe, which is conducive to improving the beating degree of pulp after beating. The above partition has the advantages of simple structure and easy maintenance.

[0014] Optionally, a stirring member is provided in the slurry storage chamber, and the stirring member includes a stirring rod and blades. The stirring rod is rotatably connected to the top of the tower body through a driving member, and a plurality of blades are provided. The plurality of blades are axially spaced and distributed along the stirring rod and fixedly connected to the stirring rod. The driving member is used to drive the stirring rod to rotate.

[0015] By adopting the above technical solution, a stirring element is arranged in the pulp storage chamber, so that the pulp in each pulp storage chamber can be stirred and broken up individually, and the pulp can be pre-dispersed during the swelling process to avoid pulp fiber agglomeration, so that the pulp can be fully swollen in the pulp storage chamber, which is beneficial to improve the beating degree of the pulp after beating.

[0016] Optionally, the driving member includes a driving frame, a planetary gear and a driving motor. A mounting hole is coaxially penetrated through the top wall of the tower body, and the hole wall of the mounting hole is evenly provided with tooth grooves along the circumferential direction. A plurality of planetary gears are provided, and the planetary gears are rotatably connected to the driving frame, and the plurality of planetary gears are meshed with the tooth grooves. The driving motor is used to drive the driving member to rotate, and the rotating shaft is fixedly connected to the driving frame, and the stirring rod and the planetary gears are coaxially fixedly connected one by one.

[0017] By adopting the above technical solution, during the production process, the driving motor drives the driving frame to rotate, and when the driving frame rotates, it drives the planetary gear to rotate around the mounting hole, and the planetary gear can rotate around the driving frame. During the rotation of the driving frame, the rotating shaft is driven to rotate, and when the rotating shaft rotates, it drives the partition connected to it to rotate, thereby driving the position of the pulp storage chamber to move; when the planetary gear rotates, it drives the stirring rod to rotate, and then drives the blade to rotate, so as to stir and break up the pulp in the pulp storage chamber. The rotation of the planetary gear around the mounting hole can prevent the stirring member from hindering the movement of the partition. The above-mentioned driving member can drive the partition and the stirring member to rotate at the same time, without the need to set up separate driving sources for the partition and the stirring member, which is conducive to reducing production energy consumption and equipment manufacturing costs.

[0018] Optionally, a sealing cover is fixedly connected to the top wall of the tower body, the sealing cover seals the mounting hole, the driving frame and the planetary gear are located inside the sealing cover, and the sealing cover is coaxially provided with an avoidance hole for the rotating shaft to pass through and an annular groove for the stirring rod to pass through.

[0019] By adopting the above technical solution, the mounting hole can be sealed by setting a sealing cover. On the one hand, it can prevent debris from falling into the tower body through the mounting hole, thereby ensuring the cleanliness of the pulp. On the other hand, the sealing cover can prevent the pulp from contacting the driving part during the production process, thereby preventing the driving part from being soaked and corroded by the pulp, which is beneficial to extending the service life of the driving part.

[0020] Optionally, a sealing ring is rotatably connected to the sealing cover, the sealing ring is rotatably connected in the ring groove, a rotating hole is opened on the sealing ring, and the stirring rod passes through the rotating hole and is rotatably connected in the rotating hole.

[0021] By adopting the above technical solution, the above sealing ring further seals the annular groove and will not hinder the rotation and movement of the stirring rod. The provision of the sealing ring can further enhance the sealing performance of the sealing cover.

[0022] Optionally, a return pipe is connected to the outlet of the disc refiner, and the other end of the return pipe is connected to the pipeline between the pre-beating pulp tank and the disc refiner.

[0023] By adopting the above technical solution and setting a reflux pipe, 20%-40% of the pulp after disc grinding and beating can be refluxed, which can improve the beating degree to a certain extent, control the amount of reflux pulp at 20%, and the beating degree after disc grinding and beating reaches 41-42°SR.

[0024] Optionally, a heating wire is embedded in the side wall of the tower body.

[0025] By adopting the above technical solution, the tower body can be heated by setting an electric heating wire, which is helpful to accelerate the swelling speed of the pulp, so that the pulp in the buffer pulp tower can be fully swelled, which is helpful to improve the beating degree of the pulp after beating.

[0026] In a second aspect, the present application provides a production process for improving the beating degree of pulp, which adopts the above-mentioned pulping system for improving the beating degree of pulp, and comprises the following steps:

[0027] S1. Waste paper is initially crushed by the pulper, and then enters the desander for preliminary filtration. The filtered pulp enters the buffer pulp tower for swelling;

[0028] S2. After the pulp is swollen in the buffer pulp tower, it enters the pre-beating pulp tank, and then enters the post-beating pulp tank after being beaten by the disc refiner to obtain the pulp for paper production.

[0029] By adopting the above technical solution, after adding a buffer pulp tower, the pulp fibers have sufficient swelling time, the power of the two disc refiners is loaded to 1000KW, and the beating degree after grinding can reach 38°SR; in this way, the power consumption of pulping per ton of pulp is reduced to 240 kWh, while the beating degree is further increased than before optimization, thereby achieving the purpose of increasing the beating degree and reducing energy consumption; and by setting a reflux pipe, 20%-40% of the pulp after disc refinement is refluxed, and the beating degree of the pulp after disc refinement reaches 41-42°SR.

[0030] In summary, the present application includes at least one of the following beneficial technical effects:

[0031] 1. The present application sets a buffer pulp tower so that the pulp can be stored in the buffer pulp tower for 3 hours, and the fibers in the pulp can be fully swollen. Then, the disc refining effect of the pulp can be more easily improved during the subsequent disc refining and beating, which is beneficial to improving the beating degree of the pulp after beating. The beating degree of the pulp after disc refining and beating can reach 38°SR, and the paper made of the pulp has good burst resistance. The amount of chemical auxiliary materials used can be reduced in subsequent operations, thereby reducing the production cost of paper;

[0032] 2. The present application provides a partition and a driving member in the tower body, so that the pulp can be soaked and swollen during the movement of the pulp storage chamber, and can prevent the pulp entering the buffer pulp tower later from flowing out through the discharge pipe earlier than the pulp entering the buffer pulp tower earlier, so that the pulp entering the buffer pulp tower can be fully swollen for 3 hours, which is beneficial to improve the beating degree of the pulp after beating;

[0033] 3. The present application can stir and disperse the pulp in each pulp storage chamber individually by arranging a stirring element in the pulp storage chamber, and can pre-disperse the pulp during the swelling process to avoid pulp fiber agglomeration, so that the pulp can be fully swollen in the pulp storage chamber, which is beneficial to improve the beating degree of the pulp after beating;

[0034] 4. The present application can heat the tower body by setting an electric heating wire, which is helpful to accelerate the swelling speed of the pulp, so that the pulp in the buffer pulp tower can be fully swollen, which is helpful to improve the beating degree of the pulp after beating. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of a pulping system for improving the pulp beating degree according to an embodiment of the present application;

[0036] Figure 2 This is a schematic diagram of the overall structure of a buffer pulp tower of a pulping system for improving the pulp beating degree according to an embodiment of the present application;

[0037] Figure 3 is a cross-sectional view of a buffer pulp tower according to an embodiment of the present application;

[0038] Figure 4 yes Figure 3 A magnified view of part A;

[0039] Figure 5 It is a schematic diagram of the structure of the sealing cover, the partition and the stirring element of the embodiment of the present application.

[0040] Figure numerals: 1. pulper; 2. desander; 3. buffer pulp tower; 31. tower body; 311. heating wire; 312. mounting hole; 313. tooth groove; 314. mounting frame; 315. pulp storage chamber; 316. feed pipe; 317. discharge pipe; 318. sealing cover; 3181. avoidance hole; 3182. ring groove; 319. sealing ring; 3191. slot; 3192. rotating hole; 32. driving member; 321. driving frame; 322. planetary gear; 323. driving motor; 33. partition; 331. rotating shaft; 332. partition; 34. stirring member; 341. stirring rod; 342. blade; 4. pulp pool before knocking; 5. disc grinding pulper; 51. reflux pipe; 6. pulp pool after knocking. DETAILED DESCRIPTION

[0041] The following is combined with Figure 1-4 This application is described in further detail.

[0042] The present application discloses a pulping system for improving the pulp beating degree. Figure 1 A pulping system for improving the beating degree of pulp includes a pulper 1, a desander 2, a buffer pulp tower 3, a pre-beating pulp pool 4, a disc-beater 5 and a post-beating pulp pool 6 which are sequentially connected through pipelines. A return pipe 51 is connected at the outlet of the disc-beater 5, and the other end of the return pipe 51 is connected to a pipeline between the pre-beating pulp pool 4 and the disc-beater 5.

[0043] Reference Figure 1 and Figure 2 The buffer slurry tower 3 includes a tower body 31, a driving member 32 and a partition 33. The tower body 31 is a hollow cylindrical body. The side wall of the tower body 31 is provided with a heating wire 311 for heating along the axial direction of the tower body 31. The partition 33 is located in the tower body 31, and the driving member 32 is used to drive the partition 33 to rotate.

[0044] Reference Figure 2 and Figure 3 The driving member 32 includes a driving frame 321, planetary gears 322 and a driving motor 323. The driving frame 321 is a square plate. There are four planetary gears 322. The four planetary gears 322 are respectively located at the four corners of the driving frame 321. The planetary gears 322 are rotatably connected to the driving frame 321. A mounting hole 312 is coaxially penetrated through the top wall of the tower body 31. The hole wall of the mounting hole 312 is uniformly provided with tooth grooves 313 along the circumferential direction. The four planetary gears 322 are all meshed with the tooth grooves 313. A mounting frame 314 is welded to the top wall of the tower body 31. The casing of the driving motor 323 and the mounting frame 314 are fixedly connected by screws. The output shaft of the driving motor 323 is welded to the geometric center point of the driving frame 321.

[0045] Reference Figure 3 , Figure 4 and Figure 5 The partition 33 includes a rotating shaft 331 and four partitions 332. The rotating shaft 331 is coaxially connected to the tower body 31. The top of the rotating shaft 331 is welded to the geometric center of the driving plate. The four partitions 332 are evenly spaced along the circumference of the rotating shaft 331. The partition 332 is a rectangular plate. One side of the partition 332 is axially welded to the rotating shaft 331 along the long side. The side of the partition 332 away from the rotating shaft 331 abuts against the inner wall of the tower body 31. The partition 332 divides the tower body 31 into four slurry storage chambers 315. The side wall of the tower body 31 is fixedly connected to two adjacent slurry storage chambers 315 with a feed pipe 316 and a discharge pipe 317. The feed pipe 316 is located at the top of the tower body 31, and the discharge pipe 317 is located at the bottom of the tower body 31.

[0046] Reference Figure 3 , Figure 4 and Figure 5 In this embodiment, the number of the slurry storage chambers 315 is uniformly four. In other embodiments, the number of the slurry storage chambers 315 can be freely selected according to the size of the tower body 31, and the number thereof is not a limitation to the present application. Similarly, the number of the planetary gears 322 and the partitions 332 also matches the number of the slurry storage chambers 315, and the number thereof should not be regarded as a limitation to the present application.

[0047] Reference Figure 3 , Figure 4 and Figure 5 The four slurry storage chambers 315 correspond to the four planetary gears 322 respectively. A stirring member 34 is provided in the slurry storage chamber 315. The stirring member 34 includes a stirring rod 341 and a blade 342. One end of the stirring rod 341 is coaxially welded to the planetary gear 322 at the top of the tower body 31. Multiple blades 342 are evenly distributed along the axial direction of the stirring rod 341 and are welded to the stirring rod 341.

[0048] Reference Figure 3 , Figure 4 and Figure 5 A sealing cover 318 is welded on the top wall of the tower body 31, and the sealing cover 318 seals the mounting hole 312. The driving frame 321 and the planetary gear 322 are located in the sealing cover 318. The sealing cover 318 is coaxially provided with an avoidance hole 3181 for the rotating shaft 331 to pass through, and the sealing cover 318 is coaxially provided with an annular groove 3182 for the stirring rod 341 to pass through. A sealing ring 319 for sealing the annular groove 3182 is rotatably connected to the sealing cover 318, and the sealing ring 319 is provided with a clamping groove 3191 on the inner and outer walls along the radial direction. The sealing ring 319 is rotatably connected to the two side walls of the annular groove 3182 through the clamping groove 3191, and a rotating hole 3192 is provided on the sealing ring 319, and the stirring rod 341 passes through the rotating hole 3192 and is rotatably connected in the rotating hole 3192.

[0049] The implementation principle of a pulping system for improving the beating degree of pulp in an embodiment of the present application is as follows: during the production process, after the buffer pulp tower 3 is filled with pulp, the buffer pulp tower 3 can buffer the pulp required for the production process for 3 hours, and the buffer pulp tower 3 is continuously injected with pulp, so that the pulp can be stored in the buffer pulp tower 3 for 3 hours, and the fibers in the pulp can be fully moistened, and then the grinding effect on the pulp can be more easily improved during subsequent disc grinding and pulping, which is beneficial to improving the beating degree of the pulp after pulping.

[0050] The tower body 31 is divided into a plurality of pulp storage chambers 315 by the partition 33. During the production process, the driving member 32 drives the partition 33 to rotate, thereby driving the pulp storage chamber 315 to change position. When a pulp storage chamber 315 is filled with pulp through the feed pipe 316, as the driving member 32 drives the partition 33 to move, the pulp storage chamber 315 can be moved from the feed pipe 316 to the discharge pipe 317, and then the pulp is discharged. During the swelling process, the stirring member 34 in the pulp storage chamber 315 can stir and disperse the pulp in each pulp storage chamber 315 separately, thereby avoiding the agglomeration of pulp fibers, so that the pulp can be fully swollen in the pulp storage chamber 315, which is conducive to improving the beating degree of the pulp after beating.

[0051] By setting the reflux pipe 51, 20%-40% of the pulp after the disc grinding and beating can be refluxed, and the beating degree after the disc grinding and beating can reach 41-42° SR.

[0052] The present application also discloses a production process for improving the beating degree of pulp, which uses the above-mentioned pulping system for improving the beating degree of pulp, and includes the following steps:

[0053] S1, waste paper is initially crushed by pulper 1, then enters desander 2 for preliminary filtration, and the filtered pulp enters buffer pulp tower 3 for swelling;

[0054] S2. After the pulp is moistened by the buffer pulp tower 3, it enters the pre-beating pulp tank 4, and then enters the post-beating pulp tank 6 after being beaten by the disc refiner 5 to obtain pulp for paper production.

[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pulping system for improving pulp beating degree, characterized in that: It comprises a pulper (1), a desander (2), a buffer pulp tower (3), a pre-beating pulp tank (4), a disc grinding pulper (5) and a post-beating pulp tank (6) which are sequentially connected through pipelines; The buffer pulp tower (3) comprises a tower body (31), a partition (33) and a driving member (32); the partition (33) divides the tower body (31) into a plurality of pulp storage chambers (315); the driving member (32) is used to drive the partition (33) to rotate; a feed pipe (316) and a discharge pipe (317) are fixedly connected to two adjacent pulp storage chambers (315) on the side wall of the tower body (31); The partition (33) comprises a rotating shaft (331) and a plurality of partitions (332); the rotating shaft (331) is coaxially rotatably connected to the tower body (31); the plurality of partitions (332) are evenly spaced along the circumference of the rotating shaft (331); one side of the partition (332) is fixedly connected to the rotating shaft (331) along the long side along the axial direction; the side of the partition (332) away from the rotating shaft (331) is in contact with the inner wall of the tower body (31); and the driving member (32) is used to drive the rotating shaft (331) to rotate; A stirring member (34) is provided in the pulp storage chamber (315), and the stirring member (34) comprises a stirring rod (341) and blades (342). The stirring rod (341) is rotatably connected to the top of the tower body (31) via a driving member (32). A plurality of blades (342) are provided, and the plurality of blades (342) are spaced apart along the axial direction of the stirring rod (341) and are fixedly connected to the stirring rod (341). The driving member (32) is used to drive the stirring rod (341) to rotate. The driving member (32) comprises a driving frame (321), a planetary gear (322) and a driving motor (323); a mounting hole (312) is coaxially penetrated through the top wall of the tower body (31); a tooth groove (313) is evenly formed on the hole wall of the mounting hole (312) along the circumferential direction; a plurality of planetary gears (322) are provided; the planetary gears (322) are rotationally connected to the driving frame (321); the plurality of planetary gears (322) are all meshed with the tooth groove (313); the driving motor (323) is used for driving the driving member (32) to rotate; the rotating shaft (331) is fixedly connected to the driving frame (321); the stirring rod (341) and the planetary gear (322) are coaxially fixedly connected in a one-to-one correspondence; A heating wire (311) is embedded in the side wall of the tower body (31).

2. A pulping system for improving pulp beating degree according to claim 1, characterized in that: A sealing cover (318) is fixedly connected to the inner top wall of the tower body (31), and the sealing cover (318) seals the mounting hole (312). The driving frame (321) and the planetary gear (322) are located in the sealing cover (318). The sealing cover (318) is coaxially provided with an avoidance hole (3181) for the rotating shaft (331) to pass through, and an annular groove (3182) for the stirring rod (341) to pass through.

3. A pulping system for improving pulp beating degree according to claim 2, characterized in that: The sealing cover (318) is rotatably connected to a sealing ring (319), the sealing ring (319) is rotatably connected in the ring groove (3182), a rotating hole (3192) is opened in the sealing ring (319), and the stirring rod (341) passes through the rotating hole (3192) and is rotatably connected in the rotating hole (3192).

4. A pulping system for improving pulp beating degree according to claim 1, characterized in that: The outlet of the disc grinder (5) is connected to a return pipe (51), and the other end of the return pipe (51) is connected to a pipeline between the pre-beating pulp tank (4) and the disc grinder (5).

5. A production process for improving the beating degree of pulp, characterized in that: A pulping system for improving the pulp beating degree according to any one of claims 1 to 4 comprises the following steps: S1, waste paper is initially crushed by a pulper (1), then enters a desander (2) for initial filtration, and the filtered pulp enters a buffer pulp tower (3) for swelling; S2. After the pulp is moistened in the buffer pulp tower (3), it enters the pre-beating pulp tank (4), and then enters the post-beating pulp tank (6) after being beaten and pulped by the disc grinding beater (5) to obtain pulp for paper production.

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