CN110331610B - Papermaking pulping system - Google Patents
Papermaking pulping system Download PDFInfo
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- CN110331610B CN110331610B CN201910583251.XA CN201910583251A CN110331610B CN 110331610 B CN110331610 B CN 110331610B CN 201910583251 A CN201910583251 A CN 201910583251A CN 110331610 B CN110331610 B CN 110331610B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/08—Removal of fats, resins, pitch or waxes; Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
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Abstract
The invention relates to the technical field of papermaking and pulping, in particular to a papermaking and pulping system, which comprises a coarse screening system, a section of fine screening pulp inlet pump connected with the coarse screening system, a 1# fine screening system and a 2# fine screening system which are respectively connected with a section of fine screening pulp inlet pump, a 1# desanding system, a 2# desanding system, a 1# multi-disc thickener, a 2# multi-disc thickener, a 1# pulp storage tower, a 2# pulp storage tower, a 1# paper machine pulp mixing system and a 2# paper machine pulp mixing system; the 1# fine screen system is sequentially connected with the 1# desanding system, the 1# multi-disc thickener, the 1# pulp storage tower and the 1# paper machine pulp distribution system, and the 2# fine screen system is sequentially connected with the 2# desanding system, the 2# multi-disc thickener, the 2# pulp storage tower and the 2# paper machine pulp distribution system; the invention avoids influencing the product quality when producing high-grade cardboard paper, improves the cleanliness of good pulp, reduces one slag discharge point, reduces the loss of fiber and improves the utilization rate of the pulp.
Description
Technical Field
The invention relates to the technical field of papermaking and pulping, in particular to a papermaking and pulping system.
Background
When the cardboard paper is produced in the paper making industry at present, the used pulping process generally comprises the steps of carrying out classification treatment on the pulp treated by a pulping system and a coarse screening system, separating the pulp subjected to classification treatment into long-fiber pulp and short-fiber pulp, conveying the short-fiber pulp to a pulp storage tower after passing through a low-concentration desanding system, a multi-disc concentrating system and a thermal dispersion system, then the paper feeder mixes the pulp for use, the treated short fiber pulp is mainly used for the surface layer of the cardboard paper, the long fiber pulp after the grading treatment is sent to the pulp storage tower after passing through the low-concentration desanding system, the fine screening system, the multi-disc concentration system and the thermal dispersion system, then the paper feeder mixes the pulp for use, the long fiber pulp is mainly used for the core bottom layer of the cardboard paper, but the short fiber pulp after being treated in the prior pulping process has more impurities, especially, white coating paper contained in waste paper is more likely to cause white spots on the finished paper surface, and the appearance quality of the finished paper is influenced when the finished paper is used for the surface layer of the cardboard paper; in addition, when the treated pulp is used for producing different grades of cardboard paper, the fiber length of the classified short-fiber pulp is relatively short due to the primary classification treatment of the pulp, and the physical strength of the high-grade cardboard paper is affected during papermaking, so that the production cost of the high-grade cardboard paper is increased. Both the treated short fiber pulp and the treated long fiber pulp need to be treated by thermal dispersion, the electric energy consumption and the steam consumption of the pulp treatment are high, and the preparation cost of the pulp is increased.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a papermaking pulping system aiming at the above defects of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a papermaking pulping system comprises a coarse screening system, a fine screening system, a desanding system, a multi-disc thickener, a pulp storage tower and a paper machine pulp distribution system which are arranged in sequence; the fine screening system comprises a section of fine screening slurry inlet pump connected with the coarse screening system through a pipeline and a slurry pump, and a No. 1 fine screening system and a No. 2 fine screening system which are respectively connected with the section of fine screening slurry inlet pump through a pipeline and a slurry pump;
the sand removing system comprises a No. 1 sand removing system and a No. 2 sand removing system;
the multi-disc thickener comprises a No. 1 multi-disc thickener and a No. 2 multi-disc thickener;
the slurry storage tower comprises a 1# slurry storage tower and a 2# slurry storage tower;
the paper machine pulp mixing system comprises a 1# paper machine pulp mixing system and a 2# paper machine pulp mixing system;
the 1# fine screen system is sequentially connected with the 1# desanding system, the 1# multi-disc thickener, the 1# pulp storage tower and the 1# paper machine pulp distribution system through pipelines and pulp pumps, and the 2# fine screen system is sequentially connected with the 2# desanding system, the 2# multi-disc thickener, the 2# pulp storage tower and the 2# paper machine pulp distribution system through pipelines and pulp pumps.
Further, 1# fine screen system includes one section of 1# fine screen and 1# two-stage section fine screen that connect gradually through pipeline and stuff pump, 1# desanding system includes one section of 1# desander and 1# two-stage section desander through pipeline and stuff pump cyclic connection, one section of 1# fine screen and 1# two-stage section fine screen all through pipeline and stuff pump with one section of 1# desander is connected, one section of 1# desander with 1# polydisc concentrator passes through the pipeline and is connected with the stuff pump.
Further, 2# fine screen system includes one section of fine screen of 2# and 2# two-stage section fine screen that connects gradually through pipeline and stuff pump, 2# desanding system includes one section of desander of 2# and 2# two-stage section desander through pipeline and stuff pump cyclic connection, one section of fine screen of 2# and 2# two-stage section fine screen all through pipeline and stuff pump with one section of desander of 2# is connected, one section of desander of 2# with be provided with reverse scummer system between the concentrated machine of 2# multiple disk, one section of desander of 2# with reverse scummer system with the concentrated machine of 2# multiple disk connects gradually through pipeline and stuff pump.
Further, the fine screen system also comprises a three-section fine screen, the three-section fine screen is connected with the downstream of the No. 1 second-section fine screen and the No. 2 second-section fine screen, the three-section fine screen is circularly connected with the No. 2 second-section fine screen, and the downstream of the three-section fine screen is also connected with an external treatment system.
Furthermore, the desanding system also comprises a three-section low-concentration desander, a four-section low-concentration desander and a five-section low-concentration desander, wherein the three-section low-concentration desander is connected with the downstream of the 1# two-section desander and the 2# two-section desander through a pipeline and a slurry pump, the three-section low-concentration desander is circularly connected with the 2# two-section desander through a pipeline and a slurry pump, the four-section low-concentration desander is circularly connected with the three-section low-concentration desander through a pipeline and a slurry pump, the five-section low-concentration desander is circularly connected with the four-section low-concentration desander through a pipeline and a slurry pump, and the downstream of the five-section low-concentration desander is connected with an external treatment system.
Furthermore, a 1# thermal dispersion system is arranged between the 1# multi-disc concentrator and the 1# slurry storage tower, and the 1# multi-disc concentrator is sequentially connected with the 1# thermal dispersion system and the 1# slurry storage tower through pipelines and a slurry pump.
The invention has the beneficial effects that: the system ensures that the fiber strength of the two kinds of pulp is consistent by sending the pulp treated by the coarse screening system to the fine screening system without grading treatment, avoids the fiber strength of the short fiber pulp subjected to grading treatment from being greatly reduced, and influences the product quality when the short fiber pulp is used for producing high-grade boxboard paper; the fine screening system is arranged in front of the desanding system, so that the screening concentration of the first-section fine screening can be improved, the screening efficiency is improved, the desanding system is arranged behind the fine screening system, the treatment concentrations of the first-section desander 1 and the first-section desander 2 can be reduced, and the purification efficiency is improved; the cleanliness of the good pulp of the 1# two-stage fine screen is improved by returning the good pulp after the three-stage fine screen treatment to the 2# two-stage fine screen treatment and not returning the good pulp to the 1# two-stage fine screen treatment, and the cleanliness of the good pulp of the 1# two-stage desander is improved by returning the good pulp after the three-stage low-concentration desander treatment to the 2# two-stage desander but not returning the good pulp to the 1# two-stage desander treatment; the good pulp treated by the No. 1 second-stage desander and the No. 2 second-stage desander enters the three-stage low-concentration desander for treatment, so that the low-concentration desanding processes behind the two-stage desanders are combined for treatment, a slag discharging point is reduced, the fiber loss is reduced, and the utilization rate of waste paper is improved; the slurry processed by the 2# section slag separator can be treated by the reverse slag separator system to remove light impurities, wax dots, hot melt adhesive and the like in the slurry, the reverse slag removal treatment equipment is less, the flow is simple, steam is not needed, and the power consumption and the steam consumption can be reduced on the premise of ensuring the quality of finished paper.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described with reference to the accompanying drawings and embodiments, wherein the drawings in the following description are only part of the embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive efforts according to the accompanying drawings:
FIG. 1 is a schematic flow diagram of a papermaking and pulping system provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without inventive step, are within the scope of the present invention.
As shown in fig. 1, a papermaking pulping system comprises a coarse screening system 1, a fine screening system 2, a sand removal system 3, a multi-disc thickener 4, a reverse slag separator system 5, a heat dispersion system 6, a pulp storage tower 7 and a paper machine pulp distribution system 8, wherein the fine screening system 2 comprises a first-stage fine screening pulp inlet pump 21, a 1# fine screening system 22 and a 2# fine screening system 23, the 1# fine screening system 22 comprises a 1# first-stage fine screen 221, and the 2# fine screening system 23 comprises a 2# first-stage fine screen 231; the sand removing system 3 comprises a No. 1 sand removing system 31 and a No. 2 sand removing system 32, the No. 1 sand removing system 31 comprises a No. 1 first-stage sand remover 311, and the No. 2 sand removing system 32 comprises a No. 2 first-stage sand remover 321; the multi-disc thickener 4 includes a # 1 multi-disc thickener 41 and a # 2 multi-disc thickener 42; the slurry storage tower 7 comprises a No. 1 slurry storage tower 71 and a No. 2 slurry storage tower 72; the paper machine pulp mixing system 8 comprises a 1# paper machine pulp mixing system 81 and a 2# paper machine pulp mixing system 82; the coarse screen system 1 is sequentially connected with a first-section fine screen pulp inlet pump 21, a first-section 1# fine screen 221, a first-section 1# desander 311, a first-section 1# multi-disc thickener 41, a thermal dispersion system 6, a first-section 1# pulp storage tower 71 and a first-section 1# paper machine pulp distribution system 81 through pipelines and pulp pumps, meanwhile, the first-section fine screen pulp inlet pump 21 is sequentially connected with a first-section 2# fine screen 231, a first-section 2# desander 321, a reverse slag remover system 5, a second-section 2# multi-disc thickener 42, a second-section 2# pulp storage tower 72 and a second-section 2# paper machine pulp distribution system 82 through pipelines and pulp pumps, wherein the reverse slag remover system 5 comprises two sections of reverse desiccants which are sequentially connected.
The good pulp after being processed by the coarse screening system 1 is delivered to the inlet of the first section of fine screening pulp inlet pump 21, the outlet of the first section of fine screening pulp inlet pump 21 is respectively treated by the 1# fine screening system 22 and the 2# fine screening system 23, the pulp is not subjected to classification treatment in the process, the fiber lengths of the two pulps are basically consistent, the fiber strength of the short pulp subjected to classification treatment is prevented from being greatly reduced, and the product quality is prevented from being influenced when the fine screening pulp is used for producing high-grade boxboard paper. The good pulp after the 1# section fine screen 221 processing of the 1# fine screen system 22 goes to the 1# section desander 311 of the 1# desanding system 31 for processing, the good pulp after the 2# section fine screen 231 processing of the 2# fine screen system 23 goes to the 2# section desander 321 of the 2# desanding system 32 for processing, the fine screen system 2 is arranged in front of the desanding system 3, the screening concentration of the fine screen system 2 is improved, the slag removal concentration of the desanding system 3 is reduced, and the screening and slag removal efficiency is improved. The good pulp processed by the No. 1 first-stage desander 311 is processed by a No. 1 multi-disc thickener 41 and then processed by a thermal dispersion system 6, the pulp processed by the No. 1 thermal dispersion system 61 is stored by a No. 1 pulp storage tower 71 and then is sent to a No. 1 paper machine pulp preparation system 81 for production and use, the good pulp is mainly used for producing the surface layer of the cardboard paper, the wax points and impurities in the pulp can be greatly reduced after the pulp is subjected to thermal dispersion treatment, and the appearance quality of the finished paper can be improved when the good pulp is used for the surface layer; good pulp processed by the 2# first-stage sand remover 321 is processed by the reverse slag remover system 5, light impurities, wax dots, hot melt adhesive and the like in the pulp are mainly removed through the reverse slag remover system 5, the processing effect of the reverse slag remover system 5 is good without heat dispersion, but reverse slag removal processing equipment is adopted, the flow is simple, steam is not needed, the power consumption and the steam consumption can be reduced on the premise of ensuring the quality of finished paper, the pulp is processed by the 2# multi-disc concentrator 42 after passing through the reverse slag remover system 5 and is stored by the 2# pulp storage tower 72 and then is sent to the 2# pulp preparation system 82 for production and use, and the reverse slag remover system is mainly used for producing a sandwich layer and a bottom layer of boxboard paper.
Further, the 1# fine screen system 22 further includes a 1# second-stage fine screen 222, the 1# first-stage fine screen 221 is sequentially connected with the 1# second-stage fine screen 222 and the 1# first-stage desander 311 through a pipeline and a slurry pump, the 1# desanding system 31 further includes a 1# second-stage desander 312, and the 1# first-stage desander 311 and the 1# second-stage desander 312 are circularly connected through a pipeline and a slurry pump. The tailings treated by the 1# first-stage fine screen 221 are treated by a 1# second-stage fine screen 222, the good pulp treated by the 1# second-stage fine screen 222 is treated by a 1# first-stage desander 311, the tailings treated by the 1# first-stage desander 311 are treated by a 1# second-stage desander 312, and the good pulp treated by the 1# second-stage desander 312 is returned to the 1# first-stage desander 311.
Simultaneously, 2# fine screen system 23 still includes 2# two-stage fine screen 232, and above-mentioned 2# one-stage fine screen 231 and 2# two-stage fine screen 232 and 2# one section desander 321 connect gradually through pipeline and stuff pump, and 2# desanding system 32 still includes 2# two-stage desander 322, and above-mentioned 2# one section desander 321 and 2# two-stage desander 322 pass through pipeline and stuff pump circulation connection. The tailings treated by the 2# first-stage fine screen 231 are treated by a 2# second-stage fine screen 232, the good pulp treated by the 2# second-stage fine screen 232 is treated by a 2# first-stage desander 321, the tailings treated by the 2# first-stage desander 321 is treated by a 2# second-stage desander 322, and the good pulp treated by the 2# second-stage desander 322 is returned to the 2# first-stage desander 321 for treatment.
Further, the fine screen system 2 further comprises a three-section fine screen 24, the three-section fine screen 24 is connected to the downstream of the No. 1 second-section fine screen 222 and the No. 2 second-section fine screen 232, the three-section fine screen 24 is circularly connected with the No. 2 second-section fine screen 232, and the downstream of the three-section fine screen 24 is further connected with an external treatment system 9. The good pulp processed by the No. 1 second-stage fine screen 222 and the No. 2 second-stage fine screen 232 enters the three-stage fine screen 24 for processing, but the good pulp processed by the three-stage fine screen 24 only returns to the No. 2 second-stage fine screen 232 for processing, and does not return to the No. 1 second-stage fine screen 222 for processing, so that the cleanliness of the good pulp of the No. 1 second-stage fine screen 222 is improved.
Further, the sand removing system 3 further comprises a three-section low-concentration sand remover 33, a four-section low-concentration sand remover 34 and a five-section low-concentration sand remover 35, the three-section low-concentration sand remover 33 is connected with the downstream of the 1# two-section sand remover 312 and the 2# two-section sand remover 322 through a pipeline and a slurry pump, the three-section low-concentration sand remover 33 is circularly connected with the 2# two-section sand remover 322 through a pipeline and a slurry pump, the four-section low-concentration sand remover 34 is circularly connected with the three-section low-concentration sand remover 33 through a pipeline and a slurry pump, the five-section low-concentration sand remover 35 is circularly connected with the four-section low-concentration sand remover 34 through a pipeline and a slurry pump, and the downstream of the five-section low-concentration sand remover 35 is connected with an external treatment system 9. Tailings treated by the No. 1 second-stage desander 312 and the No. 2 second-stage desander 322 enter the three-stage low-concentration desander 33 for treatment, and the good pulp treated by the three-stage low-concentration desander 33 only returns to the No. 2 second-stage desander 322 and does not return to the No. 1 second-stage desander 312 for treatment, so that the cleanliness of the good pulp of the No. 1 second-stage desander 312 is improved. The tailings treated by the three-section low-concentration sand remover 33 enter a four-section low-concentration sand remover 34 for treatment, the good pulp treated by the four-section low-concentration sand remover 34 returns to the three-section low-concentration sand remover 33, the tailings treated by the four-section low-concentration sand remover 34 enter a five-section low-concentration sand remover 35, the good pulp treated by the five-section low-concentration sand remover 35 returns to the four-section low-concentration sand remover 34, the tailings treated by the five-section low-concentration sand remover 35 enter an external treatment system 9 for treatment, so that the low-concentration sand removal processes behind the two-section sand remover are combined for treatment, one slag discharge point is reduced, the fiber loss is reduced, the utilization rate of waste paper is improved, the 2# two-section sand remover 322 and the three-section low-concentration sand remover 33 circularly treat the pulp, the three-section low-concentration sand remover 33 and the four-section low-concentration sand remover 34 circularly treat the pulp, and the four-section low-concentration sand remover 34 and the five-section low-concentration sand remover 35 circularly treat the pulp, further reducing the loss of fiber and improving the utilization rate of the pulp.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (3)
1. A papermaking pulping system is characterized by comprising a coarse screening system (1), a fine screening system (2), a desanding system (3), a multi-disc thickener (4), a stock tower (7) and a paper machine pulp distributing system (8) which are sequentially arranged, wherein the fine screening system (2) comprises a section of fine screening pulp inlet pump (21) connected with the coarse screening system (1) through a pipeline, and a No. 1 fine screening system (22) and a No. 2 fine screening system (23) respectively connected with the section of fine screening pulp inlet pump (21) through a pipeline;
the sand removing system (3) comprises a No. 1 sand removing system (31) and a No. 2 sand removing system (32);
the multi-disc concentrator (4) comprises a 1# multi-disc concentrator (41) and a 2# multi-disc concentrator (42);
the slurry storage tower (7) comprises a No. 1 slurry storage tower (71) and a No. 2 slurry storage tower (72);
the paper machine pulp mixing system (8) comprises a 1# paper machine pulp mixing system (81) and a 2# paper machine pulp mixing system (82);
the 1# fine screen system (22) is sequentially connected with the 1# desanding system (31), the 1# multi-disc thickener (41), the 1# pulp storage tower (71) and the 1# paper machine pulp distribution system (81) through pipelines and a pulp pump, and the 2# fine screen system (23) is sequentially connected with the 2# desanding system (32), the 2# multi-disc thickener (42), the 2# pulp storage tower (72) and the 2# paper machine pulp distribution system (82) through pipelines and a pulp pump;
the 1# fine screen system (22) comprises a 1# first-section fine screen (221) and a 1# second-section fine screen (222) which are sequentially connected through a pipeline and a slurry pump, the 1# desanding system (31) comprises a 1# first-section desander (311) and a 1# second-section desander (312) which are circularly connected through a pipeline and a slurry pump, the 1# first-section fine screen (221) and the 1# second-section fine screen (222) are both connected with the 1# first-section desander (311) through pipelines and a slurry pump, and the 1# first-section desander (311) is connected with the 1# multi-disc concentrator (41) through a pipeline and a slurry pump;
the 2# fine screen system (23) comprises a 2# first-section fine screen (231) and a 2# second-section fine screen (232) which are sequentially connected through a pipeline and a slurry pump, the 2# desanding system (32) comprises a 2# first-section desander (321) and a 2# second-section desander (322) which are circularly connected through a pipeline and a slurry pump, the 2# first-section fine screen (231) and the 2# second-section fine screen (232) are both connected with the 2# first-section desander (321) through pipelines and a slurry pump, a reverse slag remover system (5) is arranged between the 2# first-section desander (321) and the 2# multi-disc concentrator (42), the 2# first-section desander (321) is sequentially connected with the reverse slag remover system (5) and the 2# multi-disc concentrator (42) through pipelines and a slurry pump, and the desanding system (3) further comprises a three-section low-concentration desander (33), a four-section low-concentration desander (34) and a five-section low-concentration desander (35), the three-section low-concentration desander (33) is connected with the downstream of the 1# two-section desander (312) and the 2# two-section desander (322) through a pipeline and a slurry pump, the three-section low-concentration desander (33) is circularly connected with the 2# two-section desander (322) through a pipeline and a slurry pump, the four-section low-concentration desander (34) is circularly connected with the three-section low-concentration desander (33) through a pipeline and a slurry pump, the five-section low-concentration desander (35) is circularly connected with the four-section low-concentration desander (34) through a pipeline and a slurry pump, and the downstream of the five-section low-concentration desander (35) is connected with an external treatment system (9).
2. A papermaking and pulping system according to claim 1, characterized in that the fine screen system (2) further comprises a three-section fine screen (24), the three-section fine screen (24) is connected to the downstream of the 1# two-section fine screen (222) and the 2# two-section fine screen (232), the three-section fine screen (24) is circularly connected with the 2# two-section fine screen (232), and the downstream of the three-section fine screen (24) is further connected with an external treatment system (9).
3. The papermaking pulping system according to claim 1, wherein a # 1 heat dispersing system (6) is arranged between the # 1 multi-disc thickener (41) and the # 1 pulp storage tower (71), and the # 1 multi-disc thickener (41) is sequentially connected with the # 1 heat dispersing system (6) and the # 1 pulp storage tower (71) through pipelines and a pulp pump.
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| CN102733233A (en) * | 2012-07-17 | 2012-10-17 | 广东理文造纸有限公司 | Screening and deslagging technology for papermaking |
| EP2752521A1 (en) * | 2013-01-04 | 2014-07-09 | UPM-Kymmene Corporation | A method for manufacturing a fiber based product, a fiber based product and a starting material and its use |
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