CN116024836A - Pulp preparation system and method - Google Patents
Pulp preparation system and method Download PDFInfo
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- CN116024836A CN116024836A CN202310032313.4A CN202310032313A CN116024836A CN 116024836 A CN116024836 A CN 116024836A CN 202310032313 A CN202310032313 A CN 202310032313A CN 116024836 A CN116024836 A CN 116024836A
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- 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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The present utility model relates to a pulp preparation system comprising: a low-concentration refiner; a high-concentration pulping machine; and a classifying screen that screens the fiber slurry to extract long fiber components on the tailings side and short fiber components on the accepts side, wherein the long fiber components and short fiber components extracted by the classifying screen are supplied to downstream equipment individually or collectively after being pooled together as needed after passing through the low-consistency refiner and the high-consistency refiner, respectively. The utility model also relates to a corresponding pulp preparation method.
Description
Technical Field
The utility model relates to a pulp preparation system, in particular to a pulp preparation system for a primary pulp preparation line. The utility model also relates to a pulp preparation method.
Background
In pulp making systems currently in the market place, the fibers are treated either by a high consistency refiner only or by a low consistency refiner only. However, one particular fiber typically comprises a portion of longer length fibers (long fibers) and a portion of shorter length fibers (short fibers). If a low consistency refiner is used simply, the long and short fibers are cut simultaneously during refining, so that a large amount of fines are produced, which in turn generates dust and reduces strength during subsequent papermaking, for example during the manufacture of toilet paper.
If a high-consistency refiner is used alone, the short fibers are protected without the strong cutting action of the low-consistency refiner, but this is equivalent to unnecessary protection of the long fibers, and the cutting action of the long fibers is weakened. High consistency refining does not allow for an efficient cutting of long fibers, which can lead to poor formation of excessively long fibers during papermaking. Moreover, if the same freeness is desired, pure high consistency refining also has a significantly higher energy consumption than low consistency refining.
Chinese patent No. 202577040U discloses a low wood pulp high strength chest board paper making system wherein a fiber classifying screen is connected to a first refiner, a fluff tank, a first headbox, a second refiner, a fluff tank, and a second headbox, and a wire section comprises a first wire, a second wire, and a third wire, wherein the first wire is in communication with the fluff tank, the second wire is in communication with the fluff tank, and the third wire is in communication with the wood pulp tank. The short fiber component in the first headbox and the long fiber component in the second headbox are not joined together but are passed to the papermaking process on the first and second wire, respectively. Thus, each bed net is made with one tissue paper, and then three tissue papers are combined to form one thick paper. In the patent of the utility model, the first pulping machine and the second pulping machine are both connected with the headbox in sequence, so that the first pulping machine and the second pulping machine can be judged to be traditional low-concentration pulping machines.
It is therefore desirable to provide a pulp preparation system which, while satisfying the necessary cutting of the long fibers, avoids cutting of the short fibers as much as possible, thereby adapting to the different demands of the long and short fibers on refining and eventually improving the quality of the finished product, or at least being able to utilize the long and short fibers separately.
Disclosure of Invention
Accordingly, the present utility model provides a pulp preparation system comprising: a low-concentration refiner; a high-concentration pulping machine; and a classifying screen for screening the fiber slurry to extract the long fiber component on the tailings side and the short fiber component on the good slurry side, wherein the short fiber component extracted by the classifying screen passes through the high-concentration refiner, and the long fiber component extracted by the classifying screen passes through the low-concentration refiner.
According to a preferred embodiment of the utility model, the short fiber fraction extracted by the classifying screen is fed to downstream equipment after passing through the high consistency refiner, and the long fiber fraction extracted by the classifying screen is passed through the low consistency refiner before being combined with the short fiber fraction.
According to a preferred embodiment of the utility model, the long and short fiber fractions extracted by the classifying screen are brought together after passing the low and high consistency refiners, respectively.
Since the fibre pulp is first fractionated into long fibre components and short fibre components by means of a classifying screen, the long fibre components are passed through a low-consistency refiner and the short fibre components are passed through a high-consistency refiner, which meets both the requirements for partial cutting of long fibres and avoids cutting of short fibres as far as possible, since high-consistency refining mainly internally fibrillates the short fibres and not externally as in low-consistency refining. The combined pulp after classification has a protective effect on short fibers compared with pure low-concentration pulp, has a desirable cutting effect on long fibers compared with pure high-concentration pulp, so that certain paper types, such as toilet paper, can be softer and better in hand feeling on the premise of keeping strength compared with pure low-concentration pulp; compared with pure high-concentration pulping, the forming is better and more energy-saving on the premise of keeping softness.
According to a preferred embodiment of the utility model, the long fiber fractions extracted by the classifying screen are all combined immediately upstream of the classifying screen after passing through the low consistency refiner. The pulp passes through the classifying screen again after passing through the low-concentration pulp grinder, so that the short fiber components additionally generated after the long fiber components pass through the low-concentration pulp grinder can be recovered to the good pulp side by the classifying screen, and further can be subjected to high-concentration pulp grinding, and further more fine fibers are realized.
Alternatively, the long fiber components extracted from the classifying screen may be all converged immediately downstream of the pulp side of the classifying screen after passing through the low consistency refiner. This is equivalent to first refining the long fiber fraction at low concentration and then at high concentration. After the necessary cutting of the long fiber component by low consistency refining, further fibrillation is then achieved by high consistency refining.
It is also contemplated that only a portion of the long fiber fraction after passing through the low consistency refiner is returned upstream or downstream of the classifying screen. According to a preferred embodiment of the utility model, the long fiber fraction extracted by the classifying screen after passing through the low consistency refiner merges partly into the immediate upstream of the classifying screen and partly into the downstream of the high consistency refiner. Alternatively, the long fiber fraction extracted by the classifying screen may be partially collected immediately downstream of the classifying screen on the pulp side of the classifying screen after passing through the low-consistency refiner, and partially collected downstream of the high-consistency refiner.
According to a preferred embodiment of the pulp preparation system according to the utility model, the short fiber fraction extracted by the classifying screen is passed through a pulp dryness adjusting device for outputting pulp meeting the inlet pulp requirements of the high consistency refiner, before being fed to the high consistency refiner.
Preferably, the pulp dryness adjusting device is a press screw. However, it is also conceivable to use twin-wire or twin-roll presses instead of press screws, or to bring the outgoing pulp to the inlet pulp requirement of the high-consistency refiner by means of a combination of these in series.
Optionally, the short fiber fraction extracted by the classifying screen is passed through a concentrating device adapted to increase the slurry concentration to about 4% to 10% prior to being fed to the slurry dryness adjustment device to provide a slurry that meets the inlet slurry requirements of the slurry dryness adjustment device. The concentrating device is one or a combination of any of a curved screen, an inclined screen, a drum type concentrator, a gravity disc type concentrator, a vacuum multi-disc concentrator, a gravity cylinder type concentrator and an inclined spiral concentrator.
According to another aspect of the present utility model, there is also provided a pulp preparation method including: screening the fiber slurry by a classifying screen, extracting long fiber components at the tailings side and extracting short fiber components at the good slurry side; and (3) after the short fiber component extracted by the classifying screen passes through the high-concentration pulping machine, the long fiber component extracted by the classifying screen passes through the low-concentration pulping machine.
According to a preferred embodiment of the utility model, the short fiber fraction extracted by the classifying screen is fed to downstream equipment after passing through the high consistency refiner, and the long fiber fraction extracted by the classifying screen is passed through the low consistency refiner before being combined with the short fiber fraction.
Preferably, the long fiber fraction and the short fiber fraction extracted by the classifying screen are converged after passing through a low-consistency refiner and a high-consistency refiner, respectively.
According to a preferred embodiment of the utility model, the long fiber fraction extracted by the classifying screen is brought together after passing through the low consistency refiner all immediately upstream of the classifying screen. The pulp passes through the classifying screen again after passing through the low-concentration pulp grinder, so that the short fiber components additionally generated after the long fiber components pass through the low-concentration pulp grinder can be recovered to the good pulp side by the classifying screen, and further can be subjected to high-concentration pulp grinding, and further more fine fibers are realized.
Alternatively, the long fiber components extracted from the classifying screen may be all converged immediately downstream of the pulp side of the classifying screen after passing through the low consistency refiner. This is equivalent to first refining the long fiber fraction at low concentration and then at high concentration. After the necessary cutting of the long fiber component by low consistency refining, further fibrillation is then achieved by high consistency refining.
It is also contemplated that only a portion of the long fiber fraction after passing through the low consistency refiner is returned upstream or downstream of the classifying screen. According to a preferred embodiment of the utility model, the long fiber fraction extracted by the classifying screen after passing through the low consistency refiner merges partly into the immediate upstream of the classifying screen and partly into the downstream of the high consistency refiner. Alternatively, the long fiber fraction extracted by the classifying screen may be partially collected immediately downstream of the classifying screen on the pulp side of the classifying screen after passing through the low-consistency refiner, and partially collected downstream of the high-consistency refiner.
According to a preferred embodiment of the pulp preparation method according to the utility model, the short fiber fraction extracted by the classifying screen is passed through a pulp dryness adjusting device for outputting pulp meeting the inlet pulp requirements of the high consistency refiner, before being fed to the high consistency refiner.
The pulp dryness adjusting device is any one or combination of a pressing spiral, a twin-wire pulp extruder or a twin-roll pulp extruder. Preferably, the short fiber component extracted by the classifying screen is passed through a concentrating device prior to being fed to the slurry dryness adjustment device, the concentrating device being adapted to increase the slurry concentration to about 4% to 10% to provide a slurry that meets the inlet slurry requirements of the slurry dryness adjustment device. The concentrating device is one or a combination of any of a curved screen, an inclined screen, a drum type concentrator, a gravity disc type concentrator, a vacuum multi-disc concentrator, a gravity cylinder type concentrator and an inclined spiral concentrator.
Drawings
The present utility model will be described in detail with reference to the accompanying drawings. In the drawings:
fig. 1 schematically shows an embodiment of a pulp preparation system according to the utility model;
fig. 1A schematically shows another embodiment of a pulp preparation system according to the utility model;
fig. 1B, 1C, 1D and 1E show a variant embodiment of a pulp preparation system according to the utility model, respectively;
fig. 2 schematically shows an embodiment of the pulp preparation method according to the utility model.
Detailed Description
In fig. 1a pulp preparation system according to the utility model is schematically shown. Depending on the feed, if the feed is a pulp sheet formed by the dispersion of pulp bales, the pulp sheet is first broken into pulp having a concentration of about 6% in the low concentration pulper 100, then the impurities such as iron wires in the system are removed by the high concentration desander 110, and the desanded pulp is stored in the first discharge tank 120 and then pumped to the classifying screen 130 at a concentration. If the feed is wet slurry and is piped, it is provided directly to sizing screen 130 or stored in first discharge tank 120 and then to sizing screen 130.
The classifying screen 130, which in this embodiment is a pressure screen, filters out the short fiber components on the accept side and leaves the long fiber components on the reject side. After the long and short fiber fractions are separated into two, the long fiber fraction is directly supplied to the low concentration refiner 170 through a pipe, and if necessary, the long fiber fraction may be passed through an optional concentration device (not shown) for the long fiber fraction before entering the low concentration refiner, thereby effectively cutting the long fibers at a concentration of 3% to 6%. While the short fiber fraction passes through a preconcentrator 140, then through a press screw 150, and then through a high consistency refiner 160 at a consistency of 15% to 40%. The long fiber fraction and the short fiber fraction are stored in the second discharge tank 180 and the third discharge tank 190, respectively, for use by downstream equipment.
Fig. 1A schematically shows another embodiment of a pulp preparation system according to the utility model. The long and short fiber fractions are collected in a second discharge tank 180 after passing through the low consistency refiner 170 and the high consistency refiner 160, respectively, and then supplied to downstream equipment.
In the above-described process, the preconcentrator 140 is optional and not necessary, depending on whether the pulp side filtered short fiber component slurry concentration meets the inlet concentration requirement of the press screw 150. Alternatively, it may be replaced by a curved screen or any device capable of increasing the slurry concentration from about 1% to about 4% to 10%. The press screw 150 may also be other types of equipment, such as twin-wire or twin-roll presses, etc. capable of meeting the requirements for a given high consistency refining dryness. These are conventional pre-fittings for the high consistency refiner 160 and are not described in detail herein.
Fig. 1B schematically shows a variant embodiment of the pulp preparation system according to the utility model. The difference from the embodiment shown in fig. 1A is that the long fiber fraction slurry in fig. 1B is partially returned upstream of the classifying screen 130 after passing through the low consistency refiner 170, and another portion is directly combined with the short fiber fraction slurry passing through the high consistency refiner in the second discharge tank 180 before being supplied to downstream equipment. The long fiber fraction slurry returned upstream of the classifying screen 130 is collected into the input slurry of the classifying screen and classified again.
Fig. 1C schematically shows a variant embodiment of the pulp preparation system according to the utility model. The difference from the embodiment shown in fig. 1A and 1B is that the long fiber component slurry in fig. 1C is partially fed back immediately downstream of the classifying screen 130 after passing through the low consistency refiner 170, and another portion is directly combined with the short fiber component slurry passing through the high consistency refiner in the second discharge tank 180 and then supplied to downstream equipment. The long fiber fraction slurry fed back to the immediately downstream of the classifying screen 130 merges into the short fiber fraction slurry on the accept side of the classifying screen, undergoes high consistency refining and merges into the second discharge tank 180.
Fig. 1D schematically shows a variant embodiment of the pulp preparation system according to the utility model. The difference from the embodiment shown in fig. 1A, 1B and 1C is that the long fiber fraction slurry in fig. 1D is fed back all upstream of the classifying screen 130 after passing through the low consistency refiner 170, is classified again, and the short fiber fraction slurry screened to the accepts side of the classifying screen is then subjected to high consistency refining.
Fig. 1E schematically shows a variant embodiment of the pulp preparation system according to the utility model. The difference from the embodiment shown in fig. 1A, 1B, 1C and 1D is that the long fiber fraction slurry in fig. 1E is fed back all immediately downstream of the classifying screen 130 after passing through the low consistency refiner 170, so that it can be combined into the short fiber fraction slurry on the accepts side of the classifying screen and then subjected to high consistency refining together.
Also, in the various embodiments shown in fig. 1A-1E, the preconcentrator 140 is optional and not necessary, depending on whether the pulp side filtered short fiber component slurry concentration meets the inlet concentration requirement of the press screw 150.
Fig. 2 schematically shows an embodiment of the pulp preparation method according to the utility model. The slurry is stored in a discharge tank through a crushing 10 and a high concentration desanding 20, and then supplied to a classifying screen for classification screening 30. The short fiber component after classified screening is subjected to pre-concentration 40, press spiral dehydration 50 and high-concentration pulping 60, and the long fiber component is subjected to low-concentration pulping 70 and then is gathered together with the short fiber component, and is fully mixed 80 and then provided for downstream equipment. This corresponds to the pulp preparation system according to the utility model shown in fig. 1A.
Similarly, the pulp preparation method according to the present utility model may also have modifications corresponding to those of fig. 1B to 1E described above, and will not be described again here.
The foregoing has disclosed preferred embodiments of the present utility model, however, the spirit and scope of the present utility model is not limited to the specific disclosure. Those skilled in the art can devise many more embodiments and specific applications that do not depart from the spirit and scope of the utility model. Therefore, it should be understood that the detailed description and specific examples, while indicating the scope of the utility model, are not intended to limit the scope of the utility model.
List of reference numerals
10. Pulping
20. High-concentration desanding
30. Classifying screen
40. Pre-concentration
50. Dewatering
60. High-concentration pulping
70. Low-concentration pulping
80. Mixing
100. High-concentration sand remover of low-concentration pulper 110
120. First discharging pool
130. Classifying screen
140. Pre-concentration machine
150. Pressing screw
160. Second discharge tank of high-concentration pulping machine 170 and low-concentration pulping machine 180
190. Third discharging pool
Claims (23)
1. A pulp preparation system, the pulp preparation system comprising:
a low-concentration refiner;
a high-concentration pulping machine; and
a classifying screen for screening the fiber slurry to extract a long fiber component on the tailings side and a short fiber component on the accepts side,
wherein, the short fiber component extracted by the classifying screen passes through the high-concentration pulping machine, and the long fiber component extracted by the classifying screen passes through the low-concentration pulping machine.
2. The pulp preparation system of claim 1, wherein the short fiber fraction extracted by the classifying screen is fed to downstream equipment after passing through the high consistency refiner, and the long fiber fraction extracted by the classifying screen is passed through the low consistency refiner before being combined with the short fiber fraction.
3. The pulp preparation system of claim 1, wherein the short fiber fraction and the long fiber fraction extracted by the classifying screen are combined together after passing through the high consistency refiner and the low consistency refiner, respectively.
4. The pulp preparation system of claim 1, wherein the long fiber fraction and the short fiber fraction extracted by the classifying screen are stored or provided to downstream equipment after passing through a low consistency refiner and a high consistency refiner, respectively.
5. The pulp preparation system of claim 2, wherein the long fiber components extracted by the sizing screen are all combined immediately upstream of the sizing screen after passing through the low consistency refiner.
6. The pulp preparation system of claim 2, wherein the long fiber components extracted by the classifying screen all merge immediately downstream of the accept side of the classifying screen after passing through the low consistency refiner.
7. The pulp preparation system of claim 2, wherein the long fiber component extracted by the classifying screen merges in part immediately upstream of the classifying screen and in part downstream of the high consistency refiner after passing through the low consistency refiner.
8. The pulp preparation system of claim 2, wherein the long fiber component extracted by the classifying screen merges in part immediately downstream from the accept side of the classifying screen and in part downstream from the high consistency refiner after passing through the low consistency refiner.
9. The pulp preparation system according to any one of claims 1 to 8, characterized in that the short fiber fraction extracted by the classifying screen is passed through a pulp dryness adjustment device for outputting pulp meeting the inlet pulp requirements of the high consistency refiner before being fed to the high consistency refiner.
10. The pulp preparation system according to claim 9, characterized in that the pulp dryness adjustment device is any one or a combination of a press screw, a twin-wire press or a twin-roll press.
11. The pulp preparation system according to claim 9, characterized in that the short fiber fraction extracted by the classifying screen is passed through a concentration device before being fed to the pulp dryness adjustment device, said concentration device being adapted to increase the pulp concentration to 4% to 10% in order to provide a pulp meeting the inlet pulp requirements of the pulp dryness adjustment device.
12. The pulp preparation system of claim 11, wherein the concentrating device is one or a combination of any of a curved screen, a inclined screen, a drum thickener, a gravity disc thickener, a vacuum multi-disc thickener, a gravity cylinder thickener, a diagonal screw thickener.
13. A method of making pulp, the method comprising:
screening the fiber slurry by a classifying screen, extracting long fiber components at the tailings side and extracting short fiber components at the good slurry side;
and enabling the short fiber component extracted by the classifying screen to pass through a high-concentration pulping machine, and enabling the long fiber component extracted by the classifying screen to pass through the low-concentration pulping machine.
14. The pulp manufacturing method according to claim 13, characterized in that the short fiber fraction extracted by the classifying screen is supplied to a downstream apparatus after passing through the high-consistency refiner, and the long fiber fraction extracted by the classifying screen is passed through the low-consistency refiner before being converged with the short fiber fraction.
15. The pulp manufacturing method according to claim 13, characterized in that the short fiber component and the long fiber component extracted by the classifying screen are converged together after passing through the high-consistency refiner and the low-consistency refiner, respectively.
16. The pulp manufacturing method according to claim 13, characterized in that the long fiber components extracted from the classifying screen are all converged immediately upstream of the classifying screen after passing through the low-consistency refiner.
17. The pulp manufacturing method according to claim 13, characterized in that the long fiber components extracted from the classifying screen are all converged immediately downstream of the good pulp side of the classifying screen after passing through the low-consistency refiner.
18. The pulp preparation method according to claim 14, characterized in that the long fiber fraction extracted by the classifying screen is partly converged immediately upstream of the classifying screen and partly converged downstream of the high consistency refiner after passing through the low consistency refiner.
19. The pulp preparation method according to claim 14, characterized in that the long fiber fraction extracted by the classifying screen is partly converged immediately downstream of the good pulp side of the classifying screen after passing through the low consistency refiner and partly converged downstream of the high consistency refiner.
20. A pulp preparation method according to any one of claims 13-19, characterized in that the short fiber fraction extracted by the classifying screen is passed through a pulp dryness adjustment device for outputting pulp meeting the inlet pulp requirements of the high consistency refiner before being fed to the high consistency refiner.
21. The pulp preparation method according to claim 20, characterized in that the pulp dryness adjustment device is any one or a combination of a press screw, a twin-wire press or a twin-roll press.
22. The pulp preparation method according to claim 20, characterized in that the short fiber fraction extracted by the classifying screen is passed through a concentration device adapted to increase the pulp concentration to 4 to 10% before being fed to the pulp dryness adjustment device, to provide a pulp meeting the inlet pulp requirements of the pulp dryness adjustment device.
23. The method of claim 22, wherein the concentrating device is one or a combination of any of a curved screen, a inclined screen, a drum thickener, a gravity disc thickener, a vacuum multi-disc thickener, a gravity cylinder thickener, and an inclined screw thickener.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310032313.4A CN116024836A (en) | 2023-01-06 | 2023-01-06 | Pulp preparation system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310032313.4A CN116024836A (en) | 2023-01-06 | 2023-01-06 | Pulp preparation system and method |
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| Publication Number | Publication Date |
|---|---|
| CN116024836A true CN116024836A (en) | 2023-04-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310032313.4A Pending CN116024836A (en) | 2023-01-06 | 2023-01-06 | Pulp preparation system and method |
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| CN (1) | CN116024836A (en) |
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2023
- 2023-01-06 CN CN202310032313.4A patent/CN116024836A/en active Pending
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