CN211922065U - Pulping and papermaking system - Google Patents
Pulping and papermaking system Download PDFInfo
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- CN211922065U CN211922065U CN202020172931.0U CN202020172931U CN211922065U CN 211922065 U CN211922065 U CN 211922065U CN 202020172931 U CN202020172931 U CN 202020172931U CN 211922065 U CN211922065 U CN 211922065U
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Abstract
The embodiment of the utility model provides a pulping and papermaking system, be provided with first conveying unit between pulping unit and papermaking unit, wherein, pulping unit is including bleaching the module, papermaking unit is including storing the dressing trough, first conveying unit includes the mixing tank, connect at bleaching the module, the mixing tank, store pipeline between the dressing trough and set up the control valve on the pipeline, the mixing tank is kept apart with the dressing trough and is set up, and, the optional intercommunication bleaching module of control valve and mixing tank or bleaching module and storing the dressing trough, still be provided with between mixing tank and the concentrated module and be used for returning the wet thick liquid in the mixing tank back to the return pipe of concentrated module, thereby under the condition that can guarantee papermaking unit continuous production, selectively collect the mixing tank with different colours, and carry to concentrated module through the return pipe and copy and cause the pulp board, avoid the waste of fiber raw materials.
Description
Technical Field
The utility model relates to a pulping and papermaking system, in particular to pulping and papermaking system with a fiber recovery unit.
Background
At present, in order to further reduce the production cost of paper, a pulp mill and a paper mill are operated integrally to directly utilize wet pulp raw materials of the pulp mill and reduce the process steps of pulp making, pulp dispersing and the like, the wet pulp formed by fiber dissociation and bleaching of fiber raw materials of the pulp mill can be conveyed to the pulp maker through a pipeline to form a pulp board on one hand, and can also be conveyed to the paper mill through a long pipeline to form paper sheets through pulp grinding, pulp blending and paper making processes, and the pulp board and the paper sheets can be sold.
However, with the improvement of living standard, people are increasingly demanding on unbleached or low bleached paper such as natural color paper, so that pulp mills may need to make pulp sheets with different whiteness for sale or paper mill paper making, paper mills need to make paper sheets with different whiteness, especially when facing paper mills changing paper sheets with different whiteness, clear water or used wet pulp is needed to eject raw pulp in a conveying pipeline, it is known that a large section of mixed liquid is formed in the pipeline during ejection process regardless of using clear water or using used wet pulp, the color of the part of liquid is between the colors of two wet pulps, the part of wet pulp affects the color of the final paper sheet during paper making, in order to avoid the above situation, the measure is usually taken to abandon the part of wet pulp, on one hand, the waste of fiber raw materials is caused, on the other hand, environmental protection pressure is caused, meanwhile, in order to ensure that wet pulp in the conveying pipeline is completely to be used, the wet pulp in the pipeline which is longer before and after the junction is usually abandoned, and larger fiber raw material waste and environmental protection pressure are caused.
If the unbleached paper is changed into white paper, the unbleached pulp needs to be pushed by the white pulp, the white pulp can not be injected into the pulp storage tank for paper making until the pipeline is completely white pulp, but when the unbleached pulp is pushed, a longer section of mixed pulp can be formed at the junction of the white pulp and the unbleached pulp, the white pulp can not be mixed and influence the paper making of the unbleached paper for more sufficient guarantee, and the unbleached pulp can not influence the paper making of the white paper, so that the pulp at the upstream and the downstream of the junction can be abandoned.
Therefore, in order to avoid the waste of the fiber raw material and reduce the environmental protection pressure, a pulping and papermaking system is needed to solve the technical problems.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a pulping and papermaking system is in order to solve above-mentioned technical problem.
A pulping and papermaking system comprises a pulping unit, a papermaking unit and a first conveying unit for connecting the pulping unit and the papermaking unit, wherein,
the pulping unit comprises a bleaching module and a concentration module, the bleaching module is used for bleaching fibers and providing wet pulp with different whiteness to the downstream, and the concentration module is used for receiving the wet pulp and making the wet pulp into a pulp board;
the papermaking unit comprises a pulp dispersing machine, a pulp storage tank and a paper machine, and the pulp dispersing machine is connected with the pulp storage tank through a pipeline;
the first conveying unit comprises a mixing tank, a pipeline connected among the bleaching module, the mixing tank and the pulp storage tank, and a control valve arranged on the pipeline, wherein the mixing tank and the pulp storage tank are arranged in an isolated mode, the control valve can selectively communicate the bleaching module with the mixing tank or between the bleaching module and the pulp storage tank, and a return pipe used for returning wet pulp in the mixing tank to the concentration module is further arranged between the mixing tank and the concentration module.
Furthermore, the control valve is a first three-way valve, a first conveying pipe is arranged between the bleaching module and the first three-way valve, a second conveying pipe is arranged between the pulp storage tank and the first three-way valve, a third conveying pipe is arranged between the mixing tank and the first three-way valve, and the first three-way valve can be selectively communicated with the first conveying pipe and the second conveying pipe or the first conveying pipe and the third conveying pipe.
Further, a distributor is arranged between the bleaching module and the concentration module, the distributor comprises an inlet and two outlets, wherein the inlet is connected with the bleaching module through a pipeline, one of the outlets is connected with the concentration module through a pipeline, the other outlet is connected with the first conveying pipe, and the distributor is configured to adjust the flow ratio of the wet pulp conveyed through the at least two outlets.
Further, the paper machine comprises a white water tank for receiving white water, and a white water conveying pipe is arranged between the white water tank and the mixing tank and used for conveying the white water to the mixing tank.
Further, the return pipe is connected to the first delivery pipe, and the first delivery pipe is configured to selectively deliver slurry to the mixing tank through the first delivery pipe, or deliver wet slurry in the mixing tank to the concentration module through the first delivery pipe.
Furthermore, a second three-way valve is further arranged among the bleaching module, the first delivery pipe and the concentration module, the second three-way valve comprises three connectors, one connector is connected with the bleaching module through a fourth delivery pipe, the other connector is connected with the first delivery pipe, the other connector is connected with the concentration module through a fifth delivery pipe, and the second three-way valve can be selectively communicated with the fourth delivery pipe and the delivery main pipe or the fifth delivery pipe and the delivery main pipe.
Furthermore, a check valve is arranged on the fourth conveying pipe.
Furthermore, a stirring device is also arranged in the mixing tank.
Has the advantages that: the embodiment of the utility model provides a pulping and papermaking system, be provided with first conveying unit between pulping unit and papermaking unit, wherein, pulping unit is including bleaching the module, papermaking unit is including storing the dressing trough, first conveying unit includes the mixing tank, connect at bleaching the module, the mixing tank, store pipeline between the dressing trough and set up the control valve on the pipeline, the mixing tank is kept apart with the dressing trough and is set up, and, the optional intercommunication bleaching module of control valve and mixing tank or bleaching module and storing the dressing trough, still be provided with between mixing tank and the concentrated module and be used for returning the wet thick liquid in the mixing tank back to the return pipe of concentrated module, thereby under the condition that can guarantee papermaking unit continuous production, selectively collect the mixing tank with different colours, and carry to concentrated module through the return pipe and copy and cause the pulp board, avoid the waste of fiber raw materials.
Drawings
FIG. 1A schematic view of a pulping and papermaking system according to a first embodiment of the present invention
FIG. 2 schematic diagram of a pulping and papermaking system according to a second embodiment of the present invention
Dispenser 12
First three-way valve 212
Return pipe 215, 415
Dispersing machine 22
Pulping machine 24
First conveyance unit 3030
Second three-way valve 313
Check valve 314
Detailed Description
The present invention will be described in detail with reference to the following examples.
Referring to fig. 1, a first embodiment of the present invention provides a pulp and paper making system, which includes a pulp making unit 10 and a paper making unit 20.
The pulp unit 10 is used to process fibrous stock and form a pulp that can be used in papermaking, such as wet pulp or pulp sheet 14. The fiber raw material can be various plants which can be used for papermaking, such as wood, straw, sugarcane, bamboo and the like, and can form wood pulp, straw pulp, sugarcane pulp or bamboo pulp after being processed by the pulping unit 10.
The pulp making unit 10 includes a bleaching module 11 for bleaching the fibers and supplying the pulp of different whiteness downstream, but it is also possible to supply the pulp of different whiteness downstream without bleaching the fibers, and it is understood that the pulp is in a state of fiber suspension in water, which is usually also called wet pulp, and the pulp which is not bleached or lightly bleached is usually called unbleached pulp and highly bleached is called white pulp. Further, the bleaching module 11 comprises a mixer, a chlorination tower, an alkaline treatment tower, a hypochlorite bleaching tower and a bleaching agent preparation device. It will be appreciated that a feedstock treatment module, fibre dissociation module, etc. may also be provided upstream of the bleaching module 11.
The thickening module is used for receiving wet pulp and making the wet pulp into pulp sheets 14, and the pulp sheets 14 can be sold or used for providing paper sheets 28 for a paper making unit. Specifically, the concentration module includes a pulper 130, and the pulper 130 may be a fourdrinier pulper 130, a cylinder pulper 130, and the like.
The papermaking unit 20 is used for making wet pulp or pulp board 14 into paper 28, and comprises a pulp disperser 22, a pulp storage tank 23 and a paper machine 27;
the pulper 22, i.e. a pulper, is used to disperse the fibre material in water by mechanical action to form a fibre suspension. Preferably, the disperser 22 is a hydropulper 22.
The stock chest 23 is used for storing the fibre suspension processed by the pulper 22 or wet pulp from the bleaching module 11, and the stock chest 23 is arranged downstream of the pulper 22 and connected to the pulper 22 by means of a pipe.
The paper machine 27 is used for forming a dry paper sheet 28 by dewatering the fiber suspension through a screen, drying, and the like. The paper machine 27 comprises a wet part comprising devices such as a headbox, a forming wire, a felt and a white water trough 271, and a dry part comprising devices such as a dryer cylinder, a hood, etc., the fibre suspension being sprayed from the headbox, the forming wire being shaped, the felt being transferred to the dry part and receiving white water from the white water trough 271. The whitewater is the water that the wet end filters out during wire forming of wet sheet 28 and the water that drains during felt transfer of wet sheet 28; in general, the white water contains a fiber component, and the paper machine 27 may be any of various paper machines 27 such as a crescent former paper machine, a fourdrinier former paper machine, a cylinder former paper machine, and the like.
Additionally, a refiner 24 may be provided after the pulper 22 to devillicate fibers for better performance of the sheet 28 and better formation in the paper machine 27. A stock tank 25 and a size distribution module 26 may also be provided after the refiner 24 to deliver different sizes to the paper machine 27 at predetermined ratios to produce dry paper sheets 28 meeting the usage requirements. The different pulps may include one or more of pulps of different concentrations, pulps of different fiber lengths, or pulps of different fiber types.
A first conveying unit 30 is further arranged between the pulping unit 10 and the paper making unit 20, the first conveying unit 30 comprises a mixing tank 21, a pipeline connected between the bleaching module 11, the mixing tank 21 and the pulp storage tank 23, and a control valve arranged on the pipeline, the control valve can selectively communicate the bleaching module 11 with the mixing tank 21 or the bleaching module 11 with the pulp storage tank 23, a return pipe 215 is further arranged between the mixing tank 21 and the concentration module, so that wet pulp can be selectively conveyed to the mixing tank 21 or the pulp storage tank 23, and wet pulp stored in the mixing tank 21 can be returned to the concentration module through the return pipe 215 to be prepared into a pulp board 14.
More specifically, the control valve is a first three-way valve 212, a first delivery pipe 211 is arranged between the bleaching module 11 and the first three-way valve 212, a second delivery pipe 213 is arranged between the pulp storage tank 23 and the first three-way valve 212, a third delivery pipe 214 is arranged between the mixing tank 21 and the first three-way valve 212, and the first three-way valve 212 is selectively communicated with the first delivery pipe 211 and the second delivery pipe 213 or the first delivery pipe 211 and the third delivery pipe 214, so that wet pulp passing through the bleaching module 11 can be selectively delivered to the pulp storage tank 23 through the first delivery pipe 211 and the second delivery pipe 213 or delivered to the mixing tank 21 through the first delivery pipe 211 and the third delivery pipe 214.
It will be appreciated that the wet pulp, when fed to the stock tank 23, is available to the paper making unit 20 and made into sheets 28 by the paper machine 27, and when fed to the mixing tank 21, is returned to the thickening module 13 to be made into a pulp sheet 14. Meanwhile, in order to avoid the slurry in the mixing tank 21 from being wrongly distributed to the paper making unit 20 and affecting the paper sheets 28, the mixing tank 21 is isolated from the slurry storage tank 23, i.e. no direct communication pipeline is arranged between the mixing tank 21 and the slurry storage tank 23.
In one embodiment, when the papermaking unit 20 uses white pulp to make white paper, the white pulp is transferred to the stock tank 23 through the first transfer pipe 211, the first three-way valve 212, the second transfer pipe 213, transferred to the downstream through the stock tank 23, and made into white paper sheet 28 by the paper machine 27, and when a change to making a natural color paper is required, the natural color pulp output from the bleaching module 11 is first used to jack the white pulp to the stock tank 23 along the first transfer pipe 211, the first three-way valve 212, the second transfer pipe 213, and when the section where the natural color pulp is mixed with the white pulp is approached, the direction of communication of the first three-way valve 212 is switched, the portion of the mixed pulp containing the natural color pulp and the white pulp is transferred to the mixing tank 21 by communicating the first transfer pipe 211 with the third transfer pipe 214, and when the natural color pulp is present in the pipe, the first three-way valve 212 is switched again to communicate the first transfer pipe 211 with the second transfer pipe 213, so that the natural color pulp is transferred to the stock tank 23, the method can not waste fiber resources of the unbleached pulp and the white pulp in the pipeline, can still ensure continuous papermaking of paper, and can meet the requirement that a papermaking unit uses wet pulp to make paper or uses a pulp board 14 to make paper.
Further, a stirring device is arranged in the mixing tank 21, so that the slurry in the mixing tank 21 can be uniformly mixed.
Furthermore, the first delivery pipe 211, the second delivery pipe 213 and the third delivery pipe 214 are further provided with check valves to prevent the reverse flow of the wet pulp.
Further, a distributor 12 is arranged between the bleaching module 11 and the concentration module 13, the distributor 12 comprises an inlet and at least two outlets, wherein the inlet is connected with the bleaching module 11 through a pipeline, at least one of the outlets is connected with the concentration module 13 through a pipeline, at least another one of the outlets is connected with the first conveying pipe 211, and the distributor 12 is configured to adjust the flow ratio of the wet pulp conveyed through the at least two outlets.
Further, the first delivery pipe 211, the second delivery pipe 213, the third delivery pipe 214, and the recovery pipe are further provided with a delivery pump for pumping the slurry.
Further, a white water conveying pipe is disposed between the white water tank 271 and the mixing tank 21 for conveying the white water to the mixing tank 21 so as to further recover the fibers in the white water through the concentration module 13 of the pulp making unit 10.
Further, referring to fig. 2, in the second embodiment of the present invention, the first conveying unit includes a first conveying pipe 411, the return pipe 415 is connected to the first conveying pipe 411, and the first conveying pipe is configured to selectively convey the slurry to the mixing tank 41 through the first conveying pipe 411, or convey the slurry in the mixing tank 41 to the concentration module 33 through the first conveying pipe 411, so as to avoid repeatedly erecting a pipeline between the pulping unit and the papermaking unit, thereby saving the cost, and it can be understood that the return pipe 415 is further provided with a return pump 413.
Further, a second three-way valve 313 is arranged among the bleaching module 31, the first delivery pipe 411 and the concentration module 33, the second three-way valve 313 comprises three connecting ports, one of the connection ports is connected with the bleaching module 31 through the fourth delivery pipe 311, the other connection port is connected with the first delivery pipe 411, the other connection port is connected with the concentration module 33 through a fifth delivery pipe 312, and the second three-way valve 313 selectively connects the fourth delivery pipe 311 with the delivery main pipe 411 or connects the fifth delivery pipe 312 with the delivery main pipe 411, so that when the pulp passing through the bleaching module 31 needs to be delivered to the paper making unit, the fourth delivery pipe 311 may be connected to the first delivery pipe 411 by a second three-way valve 313, when the slurry in the mixing tank 41 needs to be returned to the thickening module 33, the first delivery pipe 411 and the fifth delivery pipe 312 are connected by the second three-way valve 313.
Further, in order to prevent the slurry in the mixing tank 41 from being returned to the bleaching module 31, the fourth delivery pipe 311 is further provided with a check valve 314.
Further, the pulp and paper making system is also provided with a controller for controlling the connection direction of the first three-way valve 212 or the second three-way valve 313.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (8)
1. A pulping and papermaking system is characterized by comprising a pulping unit, a papermaking unit and a first conveying unit for connecting the pulping unit and the papermaking unit, wherein,
the pulping unit comprises a bleaching module and a concentration module, the bleaching module is used for bleaching fibers and providing wet pulp with different whiteness to the downstream, and the concentration module is used for receiving the wet pulp and making the wet pulp into a pulp board;
the papermaking unit comprises a pulp dispersing machine, a pulp storage tank and a paper machine, and the pulp dispersing machine is connected with the pulp storage tank through a pipeline;
the first conveying unit comprises a mixing tank, a pipeline connected among the bleaching module, the mixing tank and the pulp storage tank, and a control valve arranged on the pipeline, wherein the mixing tank and the pulp storage tank are arranged in an isolated mode, the control valve can selectively communicate the bleaching module with the mixing tank or between the bleaching module and the pulp storage tank, and a return pipe used for returning wet pulp in the mixing tank to the concentration module is further arranged between the mixing tank and the concentration module.
2. The pulp and paper making system of claim 1 wherein the control valve is a first three-way valve, a first delivery pipe is disposed between the bleaching module and the first three-way valve, a second delivery pipe is disposed between the stock tank and the first three-way valve, a third delivery pipe is disposed between the mixing tank and the first three-way valve, and the first three-way valve selectively communicates the first delivery pipe with the second delivery pipe or communicates the first delivery pipe with the third delivery pipe.
3. The pulp and paper making system of claim 2, wherein a distributor is disposed between the bleaching module and the thickening module, the distributor comprising an inlet and two outlets, wherein the inlet is connected to the bleaching module by a conduit, wherein one of the outlets is connected to the thickening module by a conduit, wherein the other of the outlets is connected to the first delivery conduit, and wherein the distributor is configured to adjust a flow ratio of the wet pulp delivered through the at least two outlets.
4. The pulp and paper making system of claim 2, wherein the paper machine includes a white water tank for receiving white water, and a white water conveying pipe is disposed between the white water tank and the mixing tank for conveying the white water to the mixing tank.
5. The pulp and paper making system of claim 2, wherein the return pipe is connected to a first transfer pipe, and the first transfer pipe is configured to selectively transfer slurry to the mixing tank through the first transfer pipe or transfer wet slurry in the mixing tank to the thickening module through the first transfer pipe.
6. The pulp and paper making system according to claim 5, wherein a second three-way valve is further arranged among the bleaching module, the first delivery pipe and the concentration module, the second three-way valve comprises three connecting ports, one of the connecting ports is connected with the bleaching module through a fourth delivery pipe, the other connecting port is connected with the first delivery pipe, the other connecting port is connected with the concentration module through a fifth delivery pipe, and the second three-way valve can selectively connect the fourth delivery pipe with the delivery main pipe or connect the fifth delivery pipe with the delivery main pipe.
7. The pulp and paper making system of claim 6 wherein the fourth transfer pipe is provided with a check valve.
8. The pulp and paper making system of claim 1 wherein said mixing tank is further provided with an agitation device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020172931.0U CN211922065U (en) | 2020-02-14 | 2020-02-14 | Pulping and papermaking system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020172931.0U CN211922065U (en) | 2020-02-14 | 2020-02-14 | Pulping and papermaking system |
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| Publication Number | Publication Date |
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| CN211922065U true CN211922065U (en) | 2020-11-13 |
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| CN202020172931.0U Active CN211922065U (en) | 2020-02-14 | 2020-02-14 | Pulping and papermaking system |
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| CN (1) | CN211922065U (en) |
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Effective date of registration: 20210617 Address after: No.166-366 Suzhou Avenue, Suma Park, Suzhou City, Anhui Province 234000 Patentee after: Taisheng (Suzhou) daily necessities Co.,Ltd. Address before: 351100 No. 198, Chenghan West Avenue, Gongchen street, Licheng District, Putian City, Fujian Province Patentee before: TAISHENG TECHNOLOGY (Group) Co.,Ltd. |