CN110714353A - Treatment process for improving multi-disc drainage of papermaking white water - Google Patents
Treatment process for improving multi-disc drainage of papermaking white water Download PDFInfo
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- CN110714353A CN110714353A CN201910968041.2A CN201910968041A CN110714353A CN 110714353 A CN110714353 A CN 110714353A CN 201910968041 A CN201910968041 A CN 201910968041A CN 110714353 A CN110714353 A CN 110714353A
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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
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/0064—Aspects concerning the production and the treatment of green and white liquors, e.g. causticizing green liquor
- D21C11/0078—Treatment of green or white liquors with other means or other compounds than gases, e.g. in order to separate solid compounds such as sodium chloride and carbonate from these liquors; Further treatment of these compounds
Abstract
The invention discloses a treatment process for improving multi-disc drainage of papermaking white water, which comprises the following steps: step1, conveying the white water collected in the mesh lower water tank to a white water multi-disc for graded filtration, adding a retention aid into a pipeline for conveying the white water to the white water multi-disc for filtration, and finely controlling the addition amount of the retention aid to be 50-200 ppm; step2, separating the white water into turbid filtrate, clear filtrate, ultra-clear filtrate and slurry by using a white water multi-disc; step3, returning the turbid filtrate to a white water multi-disc for graded filtration again; the clear filtrate is used as paper machine thickening water and chemical dilution water; feeding the ultra-clear filtrate into a spraying system of a paper machine; step4, sending the pulp to a paper machine forming part, and recovering the water removed from the paper machine forming part to a wire water tank; step5. repeat step1. to step4. According to the invention, the addition amount of the white water multi-disc retention aid is controlled to be 50-200 ppm in a refined manner, so that the quality of paper sheets is improved, the concentration of white water is reduced, the water filtering capacity of the white water multi-disc is improved, the fiber recovery rate is improved, the water consumption for papermaking is reduced, and the repeated cyclic utilization of the white water is realized.
Description
Technical Field
The invention belongs to the technical field of papermaking, and particularly relates to a treatment process for improving multi-disc drainage of papermaking white water.
Background
The paper making is an important invention for ancient Chinese workers and is divided into a mechanism mode and a manual mode. The mechanism is continuously carried out on a paper machine, pulp suitable for paper quality is diluted to certain concentration by water, and is primarily dewatered at a wire part of the paper machine to form a wet paper sheet, and then the wet paper sheet is pressed for dewatering and then dried to form paper. The paper making industry takes primary plant fibers such as wood, bamboo, reed and the like and regenerated fibers such as waste paper and the like as raw materials, and the proportion of the waste paper raw materials in the raw material structure of the paper making industry at present reaches more than 60 percent. The white water system is a recovery, treatment and recycling system for dewatering of the forming part of the paper machine, so as to separate and recover the fibers and the fillers for reuse, and recycle the clean white water in the papermaking process.
The waste paper raw material is recycled for multiple times, so that the raw material quality is poor, impurities are more, a white water system of the conventional cardboard paper machine contains a large amount of fine fibers and fillers, the water filtering capacity of the white water by multiple discs is seriously reduced, and the consumption of clear water is greatly increased while the white water system of the paper machine is deteriorated. The conventional technology used at the present stage is that retention and drainage aids are added in a sizing process of a paper machine, so that the retention of fine fibers is improved, the drainage of pulp at a net part is improved, and the white water concentration under the net is reduced, however, the retention and drainage aids cannot completely control the white water concentration under the net, when the white water concentration is too high, the multi-disc water filtration of the white water under the net is difficult, the white water treatment capacity of multiple discs is reduced, and the ultra-clean filtrate needs additional clear water due to insufficient water filtration, so that the clear water consumption is increased; when retention and drainage aids are added in excess in order to reduce the consistency of the drainage under the wire, the quality of the paper sheet is affected again.
Disclosure of Invention
The invention aims at the problems in the prior art and provides a treatment process for improving multi-disc drainage of papermaking white water.
The invention solves the technical problems through the following technical means:
a treatment process for improving multi-disc drainage of papermaking white water, comprising the steps of:
step1, conveying the white water collected in the mesh lower water tank to a white water multi-disc for graded filtration, adding a retention aid into a pipeline for conveying the white water to the white water multi-disc for water filtration, and finely controlling the addition amount of the retention aid to be 50-200 ppm;
step2, separating the white water into turbid filtrate, clear filtrate, ultra-clear filtrate and slurry by using a white water multi-disc;
step3, returning the turbid filtrate to a white water multi-disc for graded filtration again; the clear filtrate is used as paper machine thickening water and chemical dilution water; sending the ultra-clear filtrate into a spraying system of a paper machine to replace clear water and serve as guide roller spraying water of a wet part of the paper machine;
step4, sending the pulp to a paper machine forming part, and recovering the water removed from the paper machine forming part to a wire water tank;
step5. repeat step1. to step4.
As an improvement of the technical scheme, in the step1, the addition amount of the retention aid and the torque of the white water multi-disc are finely controlled to be linked, and the higher the torque is, the larger the addition amount of the retention aid is, and the torque adjustment range is 2-60%.
As an improvement of the above technical means, in the step1, when the white water multi-disk torque exceeds 60%, the amount of the retention aid added is maintained at 200ppm, and the white water multi-disk torque is adjusted by reducing the white water treatment amount of the white water multi-disk.
As an improvement of the above technical solution, in the step1, the retention aid is cationic polyacrylamide.
As an improvement of the technical scheme, in the Step2, the concentration of the clear filtrate is 100-300 ppm.
As an improvement of the technical scheme, in the Step2, the concentration of the ultra-clear filtrate is 50-150 ppm.
As an improvement of the above technical solution, the step4 specifically comprises the following steps:
(1) the pulp enters a paper machine pressure screen through a fan pump, and a retention aid is added into a pipeline between the fan pump and the paper machine pressure screen;
(2) the pulp enters a head box from a pressure screen of a paper machine, and a filter aid is added into a pipeline between the pressure screen of the paper machine and the head box, wherein the dryness of the pulp in the head box is 1 percent;
(3) spraying the suspended slurry from the head box to a net part to form a wet paper sheet, and removing 82% of water from the slurry with the concentration of 1% by the net part to form the wet paper sheet with the dryness of 18%;
(4) and (4) recovering the white water removed in the step (3) to a wire white water pool.
As an improvement of the above technical solution, in Step4, (3), the wire section is dewatered mainly by using a forming plate, a plate dewatering box, a water leg suction box and a vacuum suction box.
The invention has the beneficial effects that: the invention has the advantages of simple process, high utilization rate of water resources, low treatment cost, high economic benefit and obvious environmental protection benefit; the addition amount of the retention aid of the white water multi-disc is 50-200 ppm by adopting fine control, the excessive high concentration of the white water or the excessive addition of the retention aid is avoided, the white water concentration is reduced while the quality of paper sheets is improved, the water filtering capacity of the white water multi-disc is improved, the fiber recovery rate and the white water treatment amount of the white water multi-disc are improved, the water consumption for papermaking is reduced, water resources are saved, the multiple recycling of the white water is realized, and the pollution caused by white water discharge is eliminated.
Drawings
FIG. 1 is a flow chart of the treatment process of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the treatment process for improving multi-disc drainage of papermaking white water according to the present invention comprises the following steps:
step1, conveying the white water collected in the mesh-below white water pool to a white water multi-disc for graded filtration, adding a retention aid into a pipeline for conveying the white water to the white water multi-disc for water filtration, and finely controlling the addition of the retention aid to be 50-200 ppm, so that the quality of paper is improved, the white water concentration is reduced, the water filtration capacity of the white water multi-disc is improved, the fiber recovery rate and the white water treatment capacity of the white water multi-disc are improved, the water consumption for papermaking is reduced, water resources are saved, the white water is recycled for multiple times, the pollution caused by white water discharge is eliminated, and the phenomenon that the white water concentration is too high or the excessive retention aid is added is avoided; the fine control is that the addition amount of the retention aid is linked with the torque of the white water multi-disc, the higher the torque is, the poorer the water filtering capability of the white water multi-disc is, the addition amount of the retention aid is increased to reduce the concentration of the white water, and the torque adjustment range is 2-60%; when the torque of the white water multi-disc exceeds 60%, the addition amount of the retention aid is kept at 200ppm, and the torque of the white water multi-disc is adjusted by reducing the white water treatment amount of the white water multi-disc so as to avoid the influence on the paper quality caused by excessive addition of the retention aid;
step2, separating the white water into turbid filtrate, clear filtrate, ultra-clear filtrate and slurry by using a white water multi-disc; the concentration of the clear filtrate is 100-300 ppm, the concentration of the ultra-clear filtrate is 50-150 ppm, the clarity of the filtrate is high, and the filtrate can be recycled;
step3, returning the turbid filtrate to the white water multi-disc for graded filtration again so as to be convenient for recycling for many times; the clear filtrate is used as paper machine thickening water and chemical dilution water; the ultra-clear filtrate is sent into a spraying system of the paper machine to replace clear water and is used as guide roller spraying water of a wet part of the paper machine, and the guide roller is mainly lubricated and reduced in friction;
step4. feeding the pulp to the paper machine forming section for dewatering to form a wet sheet; the water of the forming part of the paper machine is recycled to the wire water tank, so that the repeated recycling of the white water is realized, the pollution of the white water discharge is eliminated, the water consumption for papermaking is reduced, and the water resource is saved;
and Step5. repeating the Step1 to Step4 so as to improve the water filtering capacity of the white water with multiple discs, realize the repeated recycling of the white water, eliminate the pollution of the white water discharge, improve the fiber recovery rate, reduce the water consumption for papermaking and save water resources.
The white water multi-disc is mainly used for recovering white water generated in a paper machine paper making process and concentrating pulp in a pulping process. The working principle is as follows: when the central shaft rotates, the fan-shaped piece is immersed in the slurry under the atmospheric pressure, a slurry layer is formed, and turbid filtrate is extracted; the second part in the revolution is carried out under high vacuum degree to obtain high production capacity, ensure to separate clean filtrate, and further separate to obtain ultra-clear filtrate; when the fan-shaped sheets leave the slurry, a small amount of residual filtrate is quickly discharged, and the slurry layer is further dehydrated through air adsorption; when the fan-shaped sheet reaches the pulp stripping position, the vacuum is isolated, the dewatered pulp is stripped from the disc by a pulp stripping nozzle, and the pulp is discharged and discharged through a vertical feed box between the discs and is screwed, so that the pulp can be diluted if required; after the slurry is stripped, the fan blades are thoroughly cleaned by the oscillating nozzle.
The concentration of white water in the mesh-below white water tank is 0.1-0.3%, and the white water contains a large amount of fine fibers, and the white water is sent to a white water multi-disc for graded filtration, and the fine fibers in the white water are recovered. The small fiber content is high, the processing capacity of the white water multi-disc can be reduced, the water filtering capacity of the fibers and the processing capacity of the white water multi-disc are improved by adding the retention aid, the addition amount of the retention aid of the white water multi-disc is 50-200 ppm by adopting fine control, the white water concentration is reduced while the paper quality is improved, the water filtering capacity of the white water multi-disc is improved, and the problem that the quality of the paper is influenced by difficult water filtering of the white water multi-disc or adding excessive retention aid due to overhigh white water concentration is avoided.
In the step1, the retention aid is cationic polyacrylamide, and the Cationic Polyacrylamide (CPAM) is a linear high molecular compound, and has various active groups, so that the retention aid can be compatible with various substances and can be adsorbed to form hydrogen bonds, mainly flocculates colloid with negative charges, and has the functions of turbidity removal, decoloration, adsorption, adhesion and the like.
The method specifically comprises the following steps:
(1) the pulp enters a paper machine pressure screen through a fan pump, and a retention aid is added into a pipeline between the fan pump and the paper machine pressure screen; the fiber is dehydrated and formed in the net part, partial fine fiber is lost, retention aid such as linear cationic polyacrylamide with high molecular weight and low charge density is added before a paper machine pressure screen, the retention of the fine fiber is improved, meanwhile, the water filtering capacity of the fiber is improved, and the dehydration speed of the fiber in the net part is accelerated;
(2) the pulp enters a head box from a paper machine pressure screen, and a filter aid such as structural silica is added in a pipeline between the paper machine pressure screen and the head box and is added in front of the head box to cause bridging and electric neutralization and reunion of paper material particles, so that the retention of micro-fibers is improved, the drainage is improved, and the retention aid effect is more obvious by cooperating with the cationic polyacrylamide added in front of the paper machine pressure screen; the dryness of the pulp in the head box is 1 percent;
(3) spraying the suspended slurry from the head box to a net part to form a wet paper sheet, and removing 82% of water from the slurry with the concentration of 1% by the net part to form the wet paper sheet with the dryness of 18%; the net part is mainly dewatered by a forming plate, a plate type dewatering box, a water leg type suction box and a vacuum suction box;
(4) and (4) recovering the white water removed in the step (3) to a mesh water tank so as to realize repeated recycling of the white water, eliminate pollution caused by white water discharge, reduce water consumption for papermaking and save water resources.
The head box is the key part of modern paper machine, mainly includes cloth thick liquids ware, rectification portion, thick liquids upper wire device, and its structure and performance have the decisive effect to the formation of paper and the quality of paper: (1) the high-turbulence head box can generate high-strength micro-turbulence, effectively disperse fibers, prevent fiber precipitation and re-flocculation and effectively improve the strength of paper sheets; (2) uniformly distributing paper materials along the transverse direction of the paper machine to determine the transverse quantitative distribution of paper webs; (3) the guniting is stable, the coordination of the pulp speed and the wire speed is ensured, and the longitudinal quantitative distribution of the paper web is determined.
The treatment process for improving the multi-disc drainage of the papermaking white water disclosed by the invention has the advantages of simple process, high water resource utilization rate, low treatment cost, high economic benefit and obvious environmental protection benefit; the addition amount of the retention aid of the white water multi-disc is 50-200 ppm by adopting fine control, the excessive high concentration of the white water or the excessive addition of the retention aid is avoided, the white water concentration is reduced while the quality of paper sheets is improved, the water filtering capacity of the white water multi-disc is improved, the fiber recovery rate and the white water treatment amount of the white water multi-disc are improved, the water consumption for papermaking is reduced, water resources are saved, the multiple recycling of the white water is realized, and the pollution caused by white water discharge is eliminated.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A treatment process for improving multi-disc drainage of papermaking white water is characterized by comprising the following steps:
step1, conveying the white water collected in the mesh lower water tank to a white water multi-disc for graded filtration, adding a retention aid into a pipeline for conveying the white water to the white water multi-disc for water filtration, and finely controlling the addition amount of the retention aid to be 50-200 ppm;
step2, separating the white water into turbid filtrate, clear filtrate, ultra-clear filtrate and slurry by using a white water multi-disc;
step3, returning the turbid filtrate to a white water multi-disc for graded filtration again; the clear filtrate is used as paper machine thickening water and chemical dilution water; sending the ultra-clear filtrate into a spraying system of a paper machine to replace clear water and serve as guide roller spraying water of a wet part of the paper machine;
step4, sending the pulp to a paper machine forming part, and recovering the water removed from the paper machine forming part to a wire water tank;
step5. repeat step1. to step4.
2. A process according to claim 1 for improving multi-disc drainage of papermaking white water, characterized in that: in the step1, the fine control is that the addition amount of the retention aid is linked with the torque of the white water multi-disc, the higher the torque is, the larger the addition amount of the retention aid is, and the torque adjustment range is 2-60%.
3. A process according to claim 2 for improving multi-disc drainage of papermaking white water, characterized in that: in the step1, when the torque of the white water multi-disk exceeded 60%, the amount of the retention aid added was maintained at 200ppm, and the torque of the white water multi-disk was adjusted by reducing the white water treatment amount of the white water multi-disk.
4. A treatment process for improving multi-disc drainage of papermaking white water according to any one of claims 1 to 3, characterized in that: in the Step1, the retention aid is cationic polyacrylamide.
5. A treatment process for improving multi-disc drainage of papermaking white water according to any one of claims 1 to 3, characterized in that: in the step2, the concentration of the clear filtrate is 100-300 ppm.
6. A treatment process for improving multi-disc drainage of papermaking white water according to any one of claims 1 to 3, characterized in that: in the step2, the concentration of the ultra-clear filtrate is 50-150 ppm.
7. A treatment process for improving multi-disc drainage of papermaking white water according to any one of claims 1 to 3, characterized in that the step4. comprises the following steps:
(1) the pulp enters a paper machine pressure screen through a fan pump, and a retention aid is added into a pipeline between the fan pump and the paper machine pressure screen;
(2) the pulp enters a head box from a pressure screen of a paper machine, and a filter aid is added into a pipeline between the pressure screen of the paper machine and the head box, wherein the dryness of the pulp in the head box is 1 percent;
(3) spraying the suspended slurry from the head box to a net part to form a wet paper sheet, and removing 82% of water from the slurry with the concentration of 1% by the net part to form the wet paper sheet with the dryness of 18%;
(4) and (4) recovering the white water removed in the step (3) to a wire white water pool.
8. A process according to claim 7 for improving multi-disc drainage of papermaking white water, characterized in that: in Step4, (3), the net part is dewatered mainly by using a forming plate, a plate dewatering box, a water leg type suction box and a vacuum suction box.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112195681A (en) * | 2020-07-24 | 2021-01-08 | 山鹰国际控股股份公司 | PAC (polyaluminium chloride) adding process for wet end of paper machine |
| CN112301780A (en) * | 2020-09-18 | 2021-02-02 | 江苏理文造纸有限公司 | Anionic garbage control process for papermaking system |
| CN112811729A (en) * | 2021-01-05 | 2021-05-18 | 玖龙纸业（太仓）有限公司 | Water circulation system for pulping and papermaking |
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| CN109574314A (en) * | 2018-12-28 | 2019-04-05 | 江苏理文造纸有限公司 | A kind of water treatment system of papermaking green end |
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| US20130186584A1 (en) * | 2010-08-25 | 2013-07-25 | Ashland Licensing And Intellectual Property Llc | Method for increasing the advantages of starch in pulped cellulosic material in the production of paper and paperboard |
| CN102923880A (en) * | 2012-10-26 | 2013-02-13 | 陕西科技大学 | Technology for increasing number of recycle of papermaking white water |
| CN109574314A (en) * | 2018-12-28 | 2019-04-05 | 江苏理文造纸有限公司 | A kind of water treatment system of papermaking green end |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112195681A (en) * | 2020-07-24 | 2021-01-08 | 山鹰国际控股股份公司 | PAC (polyaluminium chloride) adding process for wet end of paper machine |
| CN112301780A (en) * | 2020-09-18 | 2021-02-02 | 江苏理文造纸有限公司 | Anionic garbage control process for papermaking system |
| CN112811729A (en) * | 2021-01-05 | 2021-05-18 | 玖龙纸业（太仓）有限公司 | Water circulation system for pulping and papermaking |
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