CN220665803U - Control system for two-stage pressure screen for damaged pulp slag - Google Patents
Control system for two-stage pressure screen for damaged pulp slag Download PDFInfo
- Publication number
- CN220665803U CN220665803U CN202322283571.8U CN202322283571U CN220665803U CN 220665803 U CN220665803 U CN 220665803U CN 202322283571 U CN202322283571 U CN 202322283571U CN 220665803 U CN220665803 U CN 220665803U
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- Prior art keywords
- pipeline
- pressure screen
- slag
- tailings
- slurry
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- 239000002893 slag Substances 0.000 title claims description 59
- 239000002002 slurry Substances 0.000 claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000007599 discharging Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- 239000000835 fiber Substances 0.000 claims description 22
- 238000011010 flushing procedure Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 238000007865 diluting Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims 1
- 230000000903 blocking effect Effects 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 description 5
- 230000002035 prolonged effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000012792 core layer Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010893 paper waste Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
Classifications
-
- 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
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- Paper (AREA)
Abstract
The utility model discloses a control system for a two-stage pressure screen for pulp residue damage, which comprises a tailings collecting tank, a slurry pump, a fluffer and a two-stage pressure screen for tailings, wherein the tailings collecting tank is used for slurry residue fed by a previous process, the middle part of the two-stage pressure screen for tailings is connected with a loss pool for conveying good slurry back to a paper damage system through a good slurry pipeline, the top of the two-stage pressure screen for tailings is connected with a light residue pipeline for discharging light residue to a trench, and the bottom of the two-stage pressure screen for tailings is connected with a heavy residue pipeline for discharging heavy residue to the trench; a differential pressure meter for monitoring the differential pressure between the feeding port and the discharging port is also connected between the feeding port and the discharging port of the tailings two-section pressure screen; the feed inlets of the fluffer and the tailing two-stage pressure screen are also respectively connected with a first white water pipeline and a second white water pipeline which are communicated with an external clean water source, and when the differential pressure between the feed inlet and the discharge outlet is monitored to exceed a set value by the differential pressure meter, the fluffing slurry diluted by the white water cleans the screen holes of the pressure screen, so that the blocking of the slurry on the screen holes is effectively slowed down.
Description
[ field of technology ]
The utility model relates to a pulp slag fluffing technology in papermaking, in particular to a control system for a pulp slag two-stage pressure screen.
[ background Art ]
At present, the generated broke is temporarily stored in a broke tower, is sent to a discharge tower at intervals, is mixed with the pulp processed by a broke pulper, and is subjected to pulping steps again. In the process of broke processing, fiber bundles in paper pulp are required to be untwined, and the paper pulp is extruded, impacted, rubbed and the like through a untwining machine device, so that the fiber bundles formed by bonding a plurality of fibers together are dispersed into single fibers, and the uniformity, the strength and the surface smoothness of paper are improved.
However, in the existing broke fluffer working process, the pressure difference of the two sections of pressure screens of the broke is relatively large, when the pressure difference reaches more than 22, the fiber in the slurry often blocks the discharge pipe, so that the pressure screens need to be cleaned and disassembled frequently, the manpower and material resources are required to be spent for cleaning operation, and the fiber loss is caused, so that the higher slurry loss is caused. Thus, improvements in the control of broke pulp residues are highly desirable.
[ utility model ]
The embodiment of the utility model provides a control system for a pulp residue two-stage pressure screen, which is used for flushing screen holes of a pressure screen plate after pulp is diluted by white water, so that the blockage of the pressure screen in the fluffing process is effectively relieved, the screen removing maintenance period is prolonged, the fiber loss is reduced, and the production efficiency is improved.
The technical scheme adopted by at least one embodiment of the utility model is as follows:
the control system for the pressure screen flushing anti-blocking in the defibering process comprises a tailings collecting tank, a slurry pump, a defibering machine and a tailings two-stage pressure screen, wherein the tailings collecting tank is used for collecting slurry fed by the defibering pressure screen and a core three-stage pressure screen, the slurry pump pumps the slurry in the tailings collecting tank to the defibering machine through a pipeline for defibering, and the defibering machine conveys the defibering slurry to the tailings two-stage pressure screen for screening through the pipeline;
the middle part of the tailings two-section pressure screen is connected with a damage pool for conveying good pulp back to a damage paper system through a good pulp pipeline, and the good pulp pipeline is provided with a first automatic timing control valve for controlling the on-off of the pipeline;
the top of the tailing second-section pressure screen is connected with a light slag pipeline for discharging light slag to a trench, and a second automatic timing control valve for controlling the on-off of the pipeline is arranged on the light slag pipeline;
the bottom of the tailing second-section pressure screen is connected with a heavy slag pipeline for discharging heavy slag to a trench, and the heavy slag pipeline is provided with a first stop valve for automatically timing on-off control of the pipeline;
a differential pressure meter for monitoring the differential pressure between the feeding port and the discharging port is also connected between the feeding port and the discharging port of the tailings two-section pressure screen;
the feeding port of the fluffer and the feeding port of the tailing second-stage pressure screen are also respectively connected with a first white water pipeline and a second white water pipeline which are communicated with an external clean water source, a second stop valve for controlling the on-off of the pipeline is arranged on the first white water pipeline, a third stop valve for controlling the on-off of the pipeline is arranged on the second white water pipeline, and when the differential pressure between the feeding port and the discharging port of the tailing second-stage pressure screen exceeds a set value, the second stop valve and the third stop valve are respectively opened, and the sieve holes of the pressure screen are cleaned through diluted fluffed slurry.
Preferably, the top of the tailings two-stage pressure screen is also connected with a return pipe for returning the slurry to the tailings collection tank.
Preferably, a fourth stop valve for controlling the entry of slurry slag and a fifth stop valve for controlling the discharge of fluffed slurry are respectively arranged on an inlet and outlet pipeline of the fluffer.
Preferably, an automatic switching valve for controlling the slurry pumped by the slurry pump to be directly discharged to the feeding port of the tailings two-stage pressure screen is further arranged on a pipeline between the fourth stop valve and the fifth stop valve.
Preferably, the tail end of the heavy slag pipeline is also connected with a broken paper tailings fiber pressure screen for guiding and processing heavy slag discharged into a trench through a pipeline, the top of the tailings fiber pressure screen is connected with a white water source for diluting tailings through a pipeline, the lower side of the tailings fiber pressure screen discharges good pulp into a pulp pond through a pipeline, and the bottom of the tailings fiber pressure screen discharges waste slag into the trench through a pipeline.
Preferably, a light slag recovery pipe which is used for converging the light slag to the heavy slag and recycling the heavy slag is also communicated between the heavy slag pipeline and the light slag pipeline.
The embodiment of the utility model has the beneficial effects that:
aiming at the problem that tailings are easy to block the screen holes of the pressure screen, a first white water pipeline and a second white water pipeline which are communicated with an external clean water source are respectively connected with a feed inlet of a fluffer and a feed inlet of a second-section pressure screen of the tailings, when the pressure difference between the feed inlet and the feed outlet of the second-section pressure screen of the tailings exceeds a set value, that is, the screen holes of a screen plate are seriously blocked, the first white water pipeline and the second white water pipeline are respectively opened, and the screen holes of the pressure screen are cleaned through diluted fluffing slurry, so that the blocking of the pressure screen in the fluffing process is effectively relieved, the screen disassembly maintenance period is prolonged, the fiber loss is reduced, the workload of the maintenance of the screen plate of the pressure screen is reduced, the workload of workers is reduced, and the production efficiency is effectively improved.
[ description of the drawings ]
Fig. 1 is a schematic diagram of the system of the present utility model.
[ detailed description ] of the utility model
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The control system for the two-stage pressure screen of the damaged pulp slag is shown in fig. 1, is used for flushing and blocking prevention of the pressure screen in the defibering process and comprises a tailings collecting tank 1, a slurry pump 2, a defibering machine 3 and a two-stage pressure screen 4 of the tailings, wherein the tailings collecting tank 1 is used for collecting the slurry fed by the damaged pulp pressure screen and the three-stage pressure screen of a core layer, the slurry pump 2 pumps the slurry in the tailings collecting tank 1 to the defibering machine 3 for defibering treatment through a pipeline, and the defibering machine 3 conveys the defibering slurry to the two-stage pressure screen 4 of the tailings for screening through the pipeline; the middle part of the tailings two-stage pressure screen 4 is connected with a loss pool 6 for conveying good pulp back to a loss paper system through a good pulp pipeline 5, and the good pulp pipeline 5 is provided with a first automatic timing control valve 7 for controlling the on-off of the pipeline; the top of the tailing second-section pressure screen 4 is connected with a light slag pipeline 8 for discharging light slag to a trench, and the light slag pipeline 8 is provided with a second automatic timing control valve 9 for controlling the on-off of the pipeline; the bottom of the tailing second-section pressure screen 4 is connected with a heavy slag pipeline 10 for discharging heavy slag to a trench, and the heavy slag pipeline 10 is provided with a first stop valve 11 for automatically timing on-off control of the pipeline; and a differential pressure meter 12 for monitoring the differential pressure between the feeding port and the discharging port is also connected between the feeding port and the discharging port of the tailings two-stage pressure screen 4.
As shown in fig. 1, the feed inlet of the fluffer 3 and the feed inlet of the tailings two-stage pressure screen 4 are respectively connected with a first white water pipeline 13 and a second white water pipeline 14 which are communicated with an external clean water source, a second stop valve 15 for controlling the on-off of the pipeline is arranged on the first white water pipeline 13, a third stop valve 16 for controlling the on-off of the pipeline is arranged on the second white water pipeline 14, and when the differential pressure between the feed inlet and the discharge outlet of the tailings two-stage pressure screen 4 is monitored by the differential pressure meter 12 to exceed a set value, namely, the screen holes of the screen plate are seriously blocked, the second stop valve 15 and the third stop valve 16 are respectively opened, the screen holes of the pressure screen are cleaned by diluted fluffing slurry, the screen hole blocking of the slurry is effectively slowed down, the screen removing maintenance period is prolonged, and the fiber loss is reduced.
As shown in fig. 1, the top of the second-stage pressure screen 4 is also connected with a return pipe 17 for returning the slurry to the tailings collecting tank 1, so that excessive slurry in the second-stage pressure screen 4 is effectively prevented from overflowing; a fourth stop valve 18 for controlling the entry of slurry slag and a fifth stop valve 19 for controlling the discharge of fluffed slurry are respectively arranged on an inlet and outlet pipeline of the fluffer 3, and an automatic switch valve 20 for controlling the slurry slag pumped by the slurry pump 2 to be directly discharged to a feed inlet of the tailings two-stage pressure screen 4 is also arranged on a pipeline between the fourth stop valve 18 and the fifth stop valve 19. In addition, a light slag recovery pipe 21 for converging light slag to heavy slag for recycling is also communicated between the heavy slag pipeline 10 and the light slag pipeline 8, a heavy slag or/and light slag guide processing waste paper tailings fiber pressure screen 22 for discharging heavy slag into a trench is also connected to the tail end of the heavy slag pipeline 10 through a pipeline, a white water source for diluting tailings is connected to the top of the tailings fiber pressure screen 22 through a pipeline, good slurry is discharged into a slurry pond 23 through a pipeline from the lower side of the tailings fiber pressure screen 22, and waste slag is discharged into the trench through a pipeline from the bottom of the tailings fiber pressure screen 22.
Through the control system, in the operation process of the tailing two-section pressure screen 4, the main operation state parameter is the pressure difference of the inlet and the outlet of the screen, when the pressure difference of the pressure difference meter 12 is too large, the screen holes of the screen plate are seriously blocked, the pressure screen is required to be opened for cleaning, the white water pipe with a certain opening degree is normally opened at the inlet to dilute the pulp inlet concentration, the blockage of the pressure screen is relieved, the screen removing period is prolonged, the workload of fiber loss and maintenance is reduced, and the production efficiency is effectively improved.
The above embodiments are merely preferred embodiments of the present utility model, and are not intended to limit the scope of the present utility model, but all equivalent changes according to the shape, construction and principle of the present utility model are intended to be included in the scope of the present utility model.
Claims (6)
1. The control system for the pressure screen flushing anti-blocking in the defibering process is characterized by comprising a tailings collecting tank, a slurry pump, a defibering machine and a tailings two-stage pressure screen, wherein the tailings collecting tank is used for collecting slurry fed by the defibering pressure screen and a core three-stage pressure screen, the slurry pump is used for pumping the slurry in the tailings collecting tank to the defibering machine for defibering treatment through a pipeline, and the defibering machine is used for conveying the defibering slurry to the tailings two-stage pressure screen for screening through the pipeline;
the middle part of the tailings two-section pressure screen is connected with a damage pool for conveying good pulp back to a damage paper system through a good pulp pipeline, and the good pulp pipeline is provided with a first automatic timing control valve for controlling the on-off of the pipeline;
the top of the tailing second-section pressure screen is connected with a light slag pipeline for discharging light slag to a trench, and a second automatic timing control valve for controlling the on-off of the pipeline is arranged on the light slag pipeline;
the bottom of the tailing second-section pressure screen is connected with a heavy slag pipeline for discharging heavy slag to a trench, and the heavy slag pipeline is provided with a first stop valve for automatically timing on-off control of the pipeline;
a differential pressure meter for monitoring the differential pressure between the feeding port and the discharging port is also connected between the feeding port and the discharging port of the tailings two-section pressure screen;
the feeding port of the fluffer and the feeding port of the tailing second-stage pressure screen are also respectively connected with a first white water pipeline and a second white water pipeline which are communicated with an external clean water source, a second stop valve for controlling the on-off of the pipeline is arranged on the first white water pipeline, a third stop valve for controlling the on-off of the pipeline is arranged on the second white water pipeline, and when the differential pressure between the feeding port and the discharging port of the tailing second-stage pressure screen exceeds a set value, the second stop valve and the third stop valve are respectively opened, and the sieve holes of the pressure screen are cleaned through diluted fluffed slurry.
2. A control system for a broke pulp slag two stage pressure screen according to claim 1, characterized in that: and the top of the tailing second-section pressure screen is also connected with a return pipe for returning the slurry to the tailing collecting tank.
3. A control system for a broke pulp slag two stage pressure screen according to claim 1, characterized in that: and a fourth stop valve for controlling the entry of slurry slag and a fifth stop valve for controlling the discharge of fluffed slurry are respectively arranged on an inlet and outlet pipeline of the fluffer.
4. A control system for a broke pulp slag two stage pressure screen according to claim 3, characterized in that: and an automatic switching valve for controlling the slurry pumped by the slurry pump to be directly discharged to the feed inlet of the tailing second-section pressure screen is also arranged on a pipeline between the fourth stop valve and the fifth stop valve.
5. A control system for a broke pulp slag two stage pressure screen according to claim 1, characterized in that: the tail end of the heavy slag pipeline is also connected with a broke tailing fiber pressure screen for guiding and processing heavy slag discharged into a trench through a pipeline, the top of the tailing fiber pressure screen is connected with a white water source for diluting tailings through a pipeline, good pulp is discharged into a pulp pond through the pipeline on the lower side of the tailing fiber pressure screen, and waste slag is discharged into the trench through the pipeline on the bottom of the tailing fiber pressure screen.
6. A control system for a broke pulp slag two stage pressure screen according to claim 5, wherein: and a light slag recovery pipe for converging the light slag to the heavy slag for recycling is also communicated between the heavy slag pipeline and the light slag pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322283571.8U CN220665803U (en) | 2023-08-23 | 2023-08-23 | Control system for two-stage pressure screen for damaged pulp slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322283571.8U CN220665803U (en) | 2023-08-23 | 2023-08-23 | Control system for two-stage pressure screen for damaged pulp slag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220665803U true CN220665803U (en) | 2024-03-26 |
Family
ID=90333240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322283571.8U Active CN220665803U (en) | 2023-08-23 | 2023-08-23 | Control system for two-stage pressure screen for damaged pulp slag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220665803U (en) |
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2023
- 2023-08-23 CN CN202322283571.8U patent/CN220665803U/en active Active
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