Deslagging system for wet spunlace and working method thereof

Abstract

The invention discloses a slag removal system for wet spunlace and a working method thereof.The system comprises a first rotary centrifugal slag removal unit and a second rotary centrifugal slag removal unit, and the first rotary centrifugal slag removal unit and the second rotary centrifugal slag removal unit each comprise a plurality of sets of rotary separators; and a double-layer flow-limiting screening device is mounted in the rotary separator. When rising to the double-layer flow-limiting screening device, light impurities mixed in accepted pulp flow are blocked by the screens and intercepted on the surface of the bottom-layer cylindrical screen or the bottom surface of the upper-layer planar-structure circular screen, and when rotary motion fluid moves downwards, most of the light impurities are restrained by fluid power to descend and enter the second rotary centrifugal slag removal unit, and the light impurities enter the second rotary centrifugal slag removal unit. And a small part of the sludge is deposited on the screening net and is cleaned by backwashing during production shutdown maintenance.

Description

Technical Field

[0001] The present invention belongs to the technical field of wet spunlace production, and more specifically, relates to a slag removal system for wet spunlace and a working method thereof. Background Art

[0002] Wet spunlace products use pulp and ultra-short chopped fibers of different lengths as raw materials, with water as the medium, and then are beaten and mixed into paper pulp. Due to the influence of raw materials and the pulping process, the pulp is often mixed with impurities such as sand, iron filings, mixed adhesives, paraffin, hot melt adhesives, plastic sheets, foam, ink particles, etc., and also contains large pulp blocks that are not fully broken up. These substances will directly affect the quality of wet spunlace nonwoven materials when they enter the web forming system. Foreign matter, large pulp blocks and impurities need to be removed before entering the web forming system. Summary of the invention

[0003] Purpose of the invention: The purpose of the present invention is to solve the deficiencies in the prior art and to provide a slag removal system and a working method thereof for wet spunlace.

[0004] Technical solution: The present invention relates to a slag removal system for wet hydroentanglement, comprising a first rotating centrifugal slag removal unit and a second rotating centrifugal slag removal unit, wherein the first rotating centrifugal slag removal unit and the second rotating centrifugal slag removal unit both comprise a plurality of groups of rotating separators, and a double-layer flow-limiting screening device is installed in the rotating separators.

[0005] In some embodiments, the first rotary centrifugal deslagging unit is located above the second rotary centrifugal deslagging unit, and the first rotary centrifugal deslagging unit is connected to the main pulp inlet.

[0006] In some embodiments, the first rotary centrifugal deslagging unit includes 6-12 groups of rotary separators, and the rotary separators are cone-type deslagging devices.

[0007] In some embodiments, the second rotary centrifugal deslagging unit includes 2-4 groups of rotary separators, and the rotary separators are cone-type deslagging devices.

[0008] In some embodiments, the double-layer flow limiting screening device includes a bottom column structure and an upper planar structure that are integrally connected; the bottom column structure includes a cylindrical screen structure and a bottom screen structure, and the upper planar structure includes a planar porous structure and a planar non-porous structure.

[0009] In some embodiments, the diameter of the bottom column structure is 1 / 3 to 1 / 2 of the cross section of the corresponding slag remover, and the mesh diameter is 38 μm to 75 μm.

[0010] In some embodiments, the center of the upper planar structure is a porous structure with a hole diameter of 23 μm to 38 μm, the size of which matches the diameter of the underlying columnar structure, and the outer circle is a non-porous structure.

[0011] In some embodiments, the double-layer current limiting screening device is installed in the upper section of the conical slag remover.

[0012] In some embodiments, the main slurry inlet is located below the upper plane structure in the double-layer flow-limiting screening device.

[0013] On the other hand, the present invention also discloses a working method of a slag removal system for wet spunlacing, comprising:

[0014] Under the power of the total pulp inlet push booster pump, the paper pulp enters the first rotary centrifugal slag removal unit through the total pulp inlet. The mass concentration of the paper pulp is controlled at 1%~2%. Each group of cone-shaped slag removers in the first rotary centrifugal slag removal unit has a universal rotary motion mechanism. The centrifugal force generated causes the paper pulp with a smaller specific gravity to move to the central low-pressure area. After reaching the bottom, it swirls upward under the pressure difference generated by the change in the cone structure. After being screened by the double-layer current limiting screening device in the slag remover, it is discharged from the first section good pulp outlet through the first section good pulp conveying pipe; at the same time, heavy impurities, foreign matter, and large pulp blocks with a specific gravity greater than that of the pulp are thrown to the wall of the device, and under the synergistic effect of gravity and the self-cleaning scraper, they spiral down to the bottom of the cone to form the first section tail pulp, which enters the second rotary centrifugal slag removal unit through the first section tail pulp conveying pipe, the first section booster pump and the conveying pipe leading to the second section;

[0015] When the light debris mixed in the good slurry flow rises to the double-layer flow-limiting screening device, it is blocked by the screen and trapped on the surface of the bottom cylindrical screening net or the bottom surface of the upper flat circular screening net. When the rotating fluid moves downward, most of the light debris is restrained by the fluid power and falls into the second rotating centrifugal slag removal unit. A small part is deposited on the screening net and is removed by backwashing when the production is shut down for maintenance.

[0016] The slurry concentration in the second rotary centrifugal slag removal unit rises to 2%~3%. In order to ensure the quality of slag removal, water needs to be added to keep the slurry concentration lower than the level in the first rotary centrifugal slag removal unit. The slurry passes through the double-layer flow limiting screening device and enters the second section good slurry outlet, and then is merged into the main slurry inlet through the pipeline and enters the next cycle of the slag removal system. The impurities are discharged from the impurity timing discharge outlet.

[0017] Beneficial effects: Compared with the prior art, the present invention provides a slag removal system and working method for wet spunlace, and its unique double-layer flow-limiting screening device design helps to control fluid movement and remove light impurities. After using the double-layer flow-limiting screening device, the wet spunlace nonwoven products contain less dirt, foreign matter and impurities, the cleanliness of the fabric surface is improved, the work efficiency of fabric inspectors is increased by 27%, and the product qualification rate is increased by 5%. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of a slag removal system according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the bottom column structure of a double-layer current limiting screening device according to an embodiment of the present invention;

[0020] Figure 3 It is a schematic diagram of the upper plane structure of a double-layer current limiting screening device according to an embodiment of the present invention;

[0021] Figure 4 The figure is a schematic diagram of the overall structure of a double-layer current limiting screening device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "center", "up", "down", "left", "right", "inside" and "outside" are the directions or positional relationships shown, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] The present invention is further described in detail below through specific implementation examples in conjunction with the accompanying drawings.

[0026] Example 1

[0027] like Figure 1 As shown, a slag removal system for wet hydroentanglement includes a first rotating centrifugal slag removal unit 3 and a second rotating centrifugal slag removal unit 8. The first rotating centrifugal slag removal unit 3 and the second rotating centrifugal slag removal unit 8 both include multiple groups of rotating separators, and a double-layer flow-limiting screening device is installed in the rotating separator.

[0028] Among them, Figure 1 As shown, the system also includes: a total slurry inlet 1, a total slurry inlet push booster pump 2, a first section good slurry delivery pipe 4, a first section good slurry outlet 5, a first section tail slurry delivery pipe 6, a first section booster pump and a delivery pipe 7 leading to the second section, a second section good slurry outlet 9, an impurity timing discharge outlet 10 and other main components. A total slurry inlet push booster pump 2 is installed at the total slurry inlet 1, the first section good slurry delivery pipe 4 and the first section good slurry outlet 5 are installed on the upper part of the first rotating centrifugal slag removal unit 3, and the first section tail slurry delivery pipe 6 is installed on the lower part of the first rotating centrifugal slag removal unit 3. The first section booster pump and the delivery pipe 7 leading to the second section are located between the first rotating centrifugal slag removal unit 3 and the second rotating centrifugal slag removal unit 8, and the second section good slurry outlet 9 and the impurity timing discharge outlet 10 are respectively connected to the second rotating centrifugal slag removal unit 8.

[0029] In this embodiment, the first rotating centrifugal slag removal unit 3 is located above the second rotating centrifugal slag removal unit 8 , and the first rotating centrifugal slag removal unit 3 is connected to the main pulp inlet 1 .

[0030] In this embodiment, the first rotary centrifugal slag removal unit 3 includes 6-12 groups of rotary separators, and the rotary separators are preferably cone-type slag removers. Each group of cone-type slag removers has a universal rotary motion mechanism, and the centrifugal force generated causes the paper pulp with a smaller specific gravity to move to the central low-pressure area. After reaching the bottom, the vortex rises under the pressure difference generated by the change in the cone structure, and after being screened by the double-layer current limiting screening device in the slag remover, it is discharged from the first-stage good pulp outlet 5 through the first-stage good pulp conveying pipe 4.

[0031] At the same time, heavy impurities, foreign matter, large pulp lumps, etc. with a specific gravity greater than that of the slurry are thrown toward the wall of the device, and under the synergistic effect of gravity and the self-cleaning scraper, they spiral down to the bottom of the cone to form the first section of tail slurry, which enters the second rotary centrifugal slag removal unit 8 through the first section of tail slurry conveying pipe 6, the first section of booster pump and the second section of conveying pipe 7.

[0032] In this embodiment, the second rotary centrifugal slag removal unit 8 is generally equipped with 2-4 groups of rotary separators, and the rotary separator is preferably a conical slag remover. The slurry passes through the double-layer flow limiting screening device and enters the second stage good slurry outlet 9, and then merges into the main slurry inlet 1 through the pipeline to enter the next cycle of the slag removal system, and the impurities are discharged from the impurity timing discharge outlet 10.

[0033] The function of the double-layer flow-limiting screening device is to screen out light debris mixed in the good pulp flow, but it is different from the fiber grading screen on the traditional paper machine. Its structure must allow fibers with a length of 2 to 12 mm to pass through, which is 3 to 4 times the fiber length allowed by the paper machine, so it must have a special structure.

[0034] The double-layer current limiting screening device is statically installed in the upper section of the slag remover, such as Figures 2 to 4 As shown, the double-layer current limiting screening device includes a bottom column structure 31 and an upper plane structure which are integrally formed and connected; the bottom column structure 31 includes a cylindrical screen structure 32 and a bottom screen structure 33, and the upper plane structure includes a plane porous structure 35 and a plane non-porous structure 34. The bottom column structure 31 of the double-layer current limiting screening device is a cylindrical screening net, and the mounting plate 36, the bottom column structure 31 and the upper plane structure are integrated into a mesh structure. The bottom circle diameter of the bottom column structure 31 is 1 / 3 to 1 / 2 of the corresponding slag remover cross section, and the mesh diameter is 38μm to 75μm, that is, 200 to 400 meshes, such as Figure 2 The connection between the cylinder and the bottom circle in the bottom column structure 31 can also be designed as a streamlined transition surface.

[0035] The upper plane structure is a plane circular screen, the middle plane porous structure 35 is a circular hole structure, the diameter of the circle is equivalent to the bottom circle diameter of the bottom column structure 31, the hole diameter is 23μm to 38μm, that is, 400 to 600 mesh, and the outer ring plane non-porous structure 34 is a non-porous stainless steel plate. Figure 3 shown.

[0036] The bottom column structure 31 and the upper plane structure in the double-layer current limiting screening device are connected by bolts, and a mounting plate 36 is arranged in the middle. The main pulp inlet 1 of the paper pulp of the slag remover is located below the non-porous stainless steel plate. Figure 4 shown.

[0037] During operation, when the light debris mixed in the good pulp flow rises to the double-layer flow limiting screening device, it is blocked by the screen and trapped on the surface of the bottom cylindrical screening net or the bottom surface of the upper flat structure circular screen. When the rotating fluid moves downward, most of the light debris is restrained by the fluid power and falls into the second rotating centrifugal deslagging unit 8. A small part is deposited on the screening net and is removed by backwashing when the production is shut down for maintenance.

[0038] Example 2

[0039] A working method of a slag removal system for wet spunlacing, comprising:

[0040] Under the power of the total pulp inlet push booster pump 2, the paper pulp enters the first rotary centrifugal slag removal unit 3 through the total pulp inlet 1. The mass concentration of the paper pulp is controlled at 1%-2%. Each group of cone-shaped slag removers in the first rotary centrifugal slag removal unit 3 has a universal rotary motion mechanism. The centrifugal force generated causes the paper pulp with a smaller specific gravity to move to the central low-pressure area. After reaching the bottom, it swirls upward under the pressure difference generated by the change in the cone structure. After being screened by the double-layer current limiting screening device in the slag remover, it is discharged from the first-stage good pulp delivery pipe 4 and the first-stage good pulp outlet 5; at the same time, heavy impurities, foreign matter, and large pulp blocks with a specific gravity greater than that of the pulp are thrown to the wall of the device, and under the synergistic effect of gravity and the self-cleaning scraper, they spirally descend to the bottom of the cone to form the first-stage tail pulp, and enter the second rotary centrifugal slag removal unit 8 through the first-stage tail pulp delivery pipe 6, the first-stage booster pump and the delivery pipe 7 leading to the second stage;

[0041] When the light debris mixed in the good pulp flow rises to the double-layer flow-limiting screening device, it is blocked by the screen and trapped on the surface of the bottom cylindrical screening net or the bottom surface of the upper flat circular screening net. When the rotating fluid moves downward, most of the light debris is restrained by the fluid power and falls down, entering the second rotating centrifugal deslagging unit 8, and a small part is deposited on the screening net and is removed by backwashing when the production is shut down for maintenance;

[0042] The slurry concentration in the second rotary centrifugal slag removal unit 8 rises to 2%~3%. In order to ensure the quality of slag removal, water needs to be added to control the slurry concentration to be lower than the level in the first rotary centrifugal slag removal unit 3. The slurry passes through the double-layer flow limiting screening device and enters the second section good slurry outlet 9, and then is merged into the main slurry inlet 1 through a pipeline to enter the next cycle of the slag removal system. The impurities are discharged from the impurity timing discharge outlet 10.

[0043] The present invention discloses a slag removal system for wet spunlace and a working method thereof. The unique double-layer flow-limiting screening device design is helpful to control fluid movement and remove light impurities. After using the double-layer flow-limiting screening device, dirt, foreign matter and impurities in wet spunlace nonwoven products are reduced, the cleanliness of the fabric surface is improved, the work efficiency of fabric inspectors is increased by 27%, and the product qualification rate is increased by 5%.

[0044] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A slag removal system for wet spunlace, characterized in that: The invention comprises a first rotating centrifugal slag removal unit and a second rotating centrifugal slag removal unit, wherein the first rotating centrifugal slag removal unit and the second rotating centrifugal slag removal unit both comprise a plurality of groups of rotating separators, and a double-layer flow-limiting screening device is installed in the rotating separators.

2. A slag removal system for wet spunlacing according to claim 1, characterized in that: The first rotary centrifugal slag removal unit is located above the second rotary centrifugal slag removal unit, and the first rotary centrifugal slag removal unit is connected to the main pulp inlet.

3. The slag removal system for wet spunlacing according to claim 1, characterized in that: The first rotary centrifugal slag removal unit includes 6-12 groups of rotary separators, and the rotary separators are cone-type slag removers.

4. The slag removal system for wet spunlacing according to claim 1, characterized in that: The second rotary centrifugal slag removal unit includes 2-4 groups of rotary separators, and the rotary separators are cone-type slag removers.

5. The slag removal system for wet spunlacing according to claim 1, characterized in that: The double-layer current limiting screening device includes a bottom column structure and an upper plane structure which are integrally formed and connected; the bottom column structure includes a cylindrical screen structure and a bottom screen structure, and the upper plane structure includes a plane porous structure and a plane non-porous structure.

6. A slag removal system for wet spunlacing according to claim 5, characterized in that: The diameter of the bottom column structure is 1 / 3 to 1 / 2 of the corresponding slag remover cross section, and the mesh diameter is 38 μm to 75 μm.

7. The slag removal system for wet spunlacing according to claim 5, characterized in that: The center of the upper plane structure is a porous structure with a hole diameter of 23 μm to 38 μm, which matches the diameter of the bottom column structure, and the outer circle is a non-porous structure.

8. The slag removal system for wet spunlacing according to claim 4, characterized in that: The double-layer current limiting screening device is installed in the upper section of the conical slag remover.

9. The slag removal system for wet spunlacing according to claim 2, characterized in that: The main slurry inlet is located below the upper plane structure in the double-layer flow limiting screening device.

10. A working method for a slag removal system for wet spunlacing according to any one of claims 1 to 9, characterized in that: include: Under the power of the total pulp inlet push booster pump, the paper pulp enters the first rotary centrifugal slag removal unit through the total pulp inlet. The mass concentration of the paper pulp is controlled at 1%~2%. Each group of cone-shaped slag removers in the first rotary centrifugal slag removal unit has a universal rotary motion mechanism. The centrifugal force generated causes the paper pulp with a smaller specific gravity to move to the central low-pressure area. After reaching the bottom, it swirls upward under the pressure difference generated by the change in the cone structure. After being screened by the double-layer current limiting screening device in the slag remover, it is discharged from the first section good pulp outlet through the first section good pulp conveying pipe; at the same time, heavy impurities, foreign matter, and large pulp blocks with a specific gravity greater than that of the pulp are thrown to the wall of the device, and under the synergistic effect of gravity and the self-cleaning scraper, they spiral down to the bottom of the cone to form the first section tail pulp, which enters the second rotary centrifugal slag removal unit through the first section tail pulp conveying pipe, the first section booster pump and the conveying pipe leading to the second section; When the light debris mixed in the good slurry flow rises to the double-layer flow-limiting screening device, it is blocked by the screen and trapped on the surface of the bottom cylindrical screening net or the bottom surface of the upper flat circular screening net. When the rotating fluid moves downward, most of the light debris is restrained by the fluid power and falls into the second rotating centrifugal slag removal unit. A small part is deposited on the screening net and is removed by backwashing when the production is shut down for maintenance. The slurry concentration in the second rotary centrifugal slag removal unit rises to 2%~3%. In order to ensure the quality of slag removal, water needs to be added to keep the slurry concentration lower than the level in the first rotary centrifugal slag removal unit. The slurry passes through the double-layer flow limiting screening device and enters the second section good slurry outlet, and then is merged into the main slurry inlet through the pipeline and enters the next cycle of the slag removal system. The impurities are discharged from the impurity timing discharge outlet.

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