CN110983851A - Method for improving operation efficiency of drying part of paper machine - Google Patents
Method for improving operation efficiency of drying part of paper machine Download PDFInfo
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- CN110983851A CN110983851A CN201911139916.4A CN201911139916A CN110983851A CN 110983851 A CN110983851 A CN 110983851A CN 201911139916 A CN201911139916 A CN 201911139916A CN 110983851 A CN110983851 A CN 110983851A
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- paper
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- stickies
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
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Abstract
The invention belongs to the technical field of pulping and papermaking, and particularly relates to a method for improving the operation efficiency of a drying part of a paper machine. The invention provides a method for improving the operation efficiency of a drying part of a paper machine, which comprises the step of adding a clean enzyme into a pulp pipe in front of a fan pump at the approach part of the paper machine, wherein the clean enzyme is polyamide hydrolase, and the addition amount of the clean enzyme is 120-150g/t pulp. By adopting the method, the operation rate is improved by 2 percent according to the paper machine with the annual output of 30 ten thousand tons, the paper machine produces 0.6 ten thousand tons more in one year, the profit of each ton of paper is 400 yuan, and the benefit produced in the year is 0.6 ten thousand tons per 400 yuan to 240 ten thousand yuan. The consumption of workshop personnel is reduced after the paper machine breaks less. The running rate is increased after paper breaking is reduced, the consumption of water electrification auxiliary cost is reduced during paper breaking, and therefore the production cost of paper per ton is reduced.
Description
Technical Field
The invention belongs to the technical field of pulping and papermaking, and particularly relates to a method for improving the operation efficiency of a drying part of a paper machine.
Background
The current raw materials of the cardboard paper are mostly waste paper which is recycled for papermaking, the waste paper contains a large amount of stickies, hot melts and asphalt, the stickness of the substances after melting is very high, and the substances after melting at a high temperature of about 100 ℃ in a drying part of a paper machine are stuck on a drying cylinder of the paper machine. When the paper is scraped by a dryer scraper, the paper is collected on the scraper blade again. Because the scraper blade of the drying cylinder of the paper machine is easy to damage and consume, the blade is locally worn or the scraper frame is deformed and the scraper is not tightly closed in the later period, and the adhesive which can not be completely scraped by the scraper is easily stuck to the surface of the drying cylinder. The paper is tightly attached to the surface of the drying cylinder, so that sometimes the paper is locally stressed due to the fact that sticky substances are stuck on the paper, paper breaking is caused due to uneven cross-web tension, or the paper is broken when the paper passes through surface sizing and an overpressure area. In practice, it has been found that, especially in the production of low-grammage paper grades, the paper break in the dryer section is essentially caused by stickies on the dryer surface. In addition, the soiling and deposits of stickies on the paper machine system, especially the wire section and the felts, reduce the cleanliness, dewatering efficiency and drying efficiency of the system.
At present, some additives aiming at reducing the dirt deposition of the sticky matters in the waste paper in a paper machine system appear in the situation, but because the required reaction time is long, the additives enter a fan pump along with pulp before the waste paper fully acts, and the phenomenon that a net water line is unstable is caused.
Disclosure of Invention
In view of the above technical problems in the background art, it is desirable to provide a method for improving the operation efficiency of the drying section of a paper machine, which can rapidly reduce the viscosity caused by the sticky substances in the sticky substances and the asphalt, thereby reducing the accumulation of the sticky substances in the paper machine system, increasing the freeness and the dewatering capacity of the paper pulp, improving the dewatering rate of the wet section of the paper machine and the drying efficiency of the paper, reducing the drying energy consumption, and facilitating the improvement of the paper machine speed and the production efficiency.
In order to achieve the above objects, the inventors provide a method for improving the operational efficiency of the drying section of a paper machine, comprising the step of adding a clean enzyme in the pulp conduit before the fan pump at the approach location of the paper machine, wherein the clean enzyme is a polyamide hydrolase added in an amount of 150-250g/t pulp.
The stickies in the waste paper are organic substances containing a large amount of hydrophobic property, and can be divided into large stickies particles and small stickies particles according to the particle size, and the stickies harmful to papermaking are caused by the large stickies particles with the diameter of more than 0.1 mm. These hydrophobic substances are mainly glues and adhesives, among which one of the main sources is vinyl acetate (PVAc), which is an important factor causing stickies problems. The control of stickies can be achieved by treating or modifying the vinyl acetate (PVAc). The glue control enzyme provided by the invention can effectively hydrolyze vinyl acetate (PVAc) to form a water-soluble low-molecular substance. The hydrolyzed product can be stably dispersed on the fiber surface, the surface viscosity is reduced, the possibility of agglomeration of the hydrolyzed product into large sticky particles is greatly reduced, and the large sticky particles can be attached to the fiber surface and taken out of the system with paper without causing the quality reduction of the paper, so that the sticky influence on the production phenomenon is effectively controlled.
The clean enzyme degrades and changes stickies and colloidal garbage with different compositions in a slurry system through a plurality of reaction mechanisms such as hydrolysis, oxidation and the like, and realizes the broad spectrum control of the biological enzyme on the stickies. Meanwhile, the fat-binding protein selectively reacts with undegraded particle stickies to ensure that the fat-binding protein is stably dispersed in water and effectively removed, thereby efficiently solving the problem of stickies/resins puzzling the paper industry for many years, including reducing the dirt deposition of the stickies in a paper machine system (particularly a wire part and a blanket), improving the cleanness of the system, reducing paper breakage, improving the dewatering and drying efficiency and the like.
Preferably, the polyamide hydrolase consists of the E3 enzyme and the PAMI enzyme produced by the yellow-producing strain K172.
In a more preferred embodiment of the present invention, the ratio of the activities of E3 enzyme and PAMI enzyme produced by the xanthogenic strain K172 in the polyamide hydrolase is (0.1-0.3): (1.5-120).
In a more preferred embodiment of the present invention, the ratio of the activities of E3 enzyme and PAMI enzyme produced by Flavobacterium sp.K 172 in the polyamide hydrolase is 0.2: 4.
Different from the prior art, the technical scheme at least has the following beneficial effects:
1. the dirt deposition of stickies in a paper machine system (particularly a net part and a blanket) is reduced or even eliminated, the cleanness of the paper machine system is improved, and the stickies in a drying part are obviously reduced, so that the paper breaking condition caused by the stickies is obviously reduced;
2. the net part speed difference is obviously reduced, the net part dehydration is obviously improved, the net part waterline is shortened, the dehydration is more uniform, the waterline is more neat, the improvement of the paper sheet uniformity is facilitated, and the banner quantitative difference is favorably reduced;
3. the influence of stickies on paper is eliminated by enhancing the surface cleanliness of the fibers, the fiber bonding force is improved, and the tensile strength and the tearing strength are increased;
4. the freeness and the dewatering capacity of the paper pulp are enhanced, the dewatering speed of the wet end of the paper machine and the drying efficiency of the paper are improved, the drying energy consumption is reduced, and the improvement of the speed and the production efficiency of the paper machine is facilitated;
5. the clean enzyme and the adhesive react with the adhesive substances in the asphalt to reduce the viscosity, and then the adhesive substances and the paper wool are mixed, passivated and solidified, so that the paper is not stuck to the paper and the paper breaking of the paper machine in a drying part and a surface adhesive pressing area is avoided, and the running efficiency of the paper machine is influenced.
Detailed Description
A method according to the invention for increasing the operating efficiency of the drying section of a paper machine is described in detail below.
The waste paper pulp has good economic benefit, social benefit and environmental protection benefit, and is increasingly widely applied to the modern pulping and papermaking industry. However, as the recycling amount of the secondary fibers increases, the problem of blocking of stickies in the waste paper is serious, and the stickies mainly come from various artificially synthesized organic matters such as pressure-sensitive adhesive, hot melt, coating adhesive, sizing agent, ink residue and the like in the waste paper. These stickies present a variety of hazards to the pulp and paper making process, mainly: deposited on the forming net to block the meshes, thereby causing difficult water filtration and increasing the shutdown cleaning time and the labor cost; the water is deposited in the pressing felt and the pressing roller, so that the service life of the felt is shortened, and the dehydration of paper sheets is influenced; adhere to the surface of the drying cylinder to cause the broken end of the paper sheet; remain in the paper sheet, form stains, and increase paper defects.
The invention provides a method for using polyamide hydrolase as a clean enzyme of a paper machine system to solve the problem of obstacles caused by stickies in pulping and papermaking of waste paper. The clean enzyme degrades and changes stickies and colloidal garbage with different compositions in a slurry system through a plurality of reaction mechanisms such as hydrolysis, oxidation and the like, and realizes the broad spectrum control of the biological enzyme on the stickies. Meanwhile, the fat-binding protein selectively reacts with undegraded particle stickies to ensure that the fat-binding protein is stably dispersed in water and effectively removed, thereby efficiently solving the problem of stickies/resins puzzling the paper industry for many years, including reducing the dirt deposition of the stickies in a paper machine system (particularly a wire part and a blanket), improving the cleanness of the system, reducing paper breakage, improving the dewatering and drying efficiency and the like.
The invention provides a method for improving the operation efficiency of a drying part of a paper machine, which comprises the step of adding a clean enzyme into a pulp pipe in front of a fan pump at the approach part of the paper machine, wherein the clean enzyme is polyamide hydrolase, and the addition amount of the clean enzyme is 150-250g/t pulp.
When the clean enzyme is added, the type and the performance of the clean enzyme can cause unstable operation of a paper machine, fluctuation of quality of finished paper, freeness of ground pulp, high and low finished paper breaking time and the like. Therefore, the reaction time and the maintenance of slurry stability during clean enzyme addition in the slurry pipe before the fan pump are the core factors of the flow system.
The efficiency of the biological enzyme preparation in practical production and application is easily inhibited in extreme environments such as high temperature in a paper machine system. Therefore, it is necessary to select a bio-enzyme that is resistant to acid and alkali, an organic solvent, and high-temperature hydrolysis of complex components such as proteins and esters.
Therefore, preferably, the polyamide hydrolase consists of the E3 enzyme and the PAMI enzyme produced by the yellow-producing strain K172.
In a more preferred embodiment of the present invention, the ratio of the activities of E3 enzyme and PAMI enzyme produced by the xanthogenic strain K172 in the polyamide hydrolase is (0.1-0.3): (1.5-120).
In a more preferred embodiment of the present invention, the ratio of the activities of E3 enzyme and PAMI enzyme produced by Flavobacterium sp.K 172 in the polyamide hydrolase is 0.2: 4.
In order to explain technical contents, structural features, and objects and effects of the technical means in detail, the following detailed description is given with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present application.
The embodiment of the invention takes national waste as pulping raw material, and other papermaking processes are the same as the prior art; the polyamide hydrolase adopted by the invention is composed of E3 enzyme and PAMI enzyme which are generated under the control of nyl-c gene of a yellow-producing strain K172, and is directly purchased from the company of Roner and Planck, and the cellulase, lipase and neutral esterase used in the comparative example of the invention are all common biological enzymes which can be purchased from the market. In order to improve the operation efficiency of the drying part of the paper machine, the method of examples 1 to 3 adopts the step of adding the cleaning enzyme into the pulp pipe in front of the fan pump at the approach part of the paper machine, wherein the cleaning enzyme is polyamide hydrolase, and the proportion and the addition amount of the polyamide hydrolase are shown in the table 1.
Comparative examples 1-3 each employed the step of adding cellulase, lipase and neutral esterase at the pulp line before the fan pump at the approach point of the paper machine, the activities and amounts of cellulase, lipase and neutral esterase being shown in table 2.
TABLE 1 EXAMPLES 1-3 compounding ratio and addition amount of Polyamide hydrolase
TABLE 2 comparative examples 1-3 enzyme composition, activity and addition
The addition schemes of the polyamide hydrolase of the examples 1 to 3 of the present invention and the addition schemes of the comparative examples 1 to 3 were used in the production line for producing boxboard from recycled waste paper, the addition sites were all at the fan pump, and the use effects are shown in Table 3.
TABLE 3 effects of application of examples 1-3 and comparative examples 1-3
As can be seen from the comparison of the results in tables 1-3, the method provided by the present invention was used: the situation of stickies at the drying part is obviously improved, the speed difference of the net part is greatly reduced, the black spots of finished paper basically disappear, the speed of the paper machine is improved, and the production efficiency of the paper machine is improved.
Generally, the inventor continuously searches in the production practice to find that the method for improving the running efficiency of the drying part of the paper machine provided by the invention can be used for adding polyamide hydrolase into a fan pump to:
1. the viscosity of the stickies such as pitch in the rubber compound is reduced, and the stickies are mixed with the slurry to solidify the slurry;
2. the running efficiency of the dry part of the paper machine is improved, and the broken ends of the paper at the dry part are reduced;
3. the whole operation efficiency of the paper machine is improved by 2 percent, and the number of black spots formed by stickies at a calender is reduced by more than 75 percent.
The operation rate is improved by 2 percent according to the paper machine with the annual output of 30 ten thousand tons, the paper machine produces 0.6 ten thousand tons more in one year, the profit of one ton of paper wool is 400 yuan, and the benefit produced in the year is 0.6 ten thousand tons per 400 yuan to 240 ten thousand yuan. The consumption of workshop personnel is reduced after the paper machine breaks less. The running rate is increased after paper breaking is reduced, the consumption of water electrification auxiliary cost is reduced during paper breaking, and therefore the production cost of paper per ton is reduced.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein or by using equivalent structures or equivalent processes performed in the present specification, and are included in the scope of the present invention.
Claims (4)
1. The method for improving the operation efficiency of the drying part of the paper machine is characterized by comprising the step of adding a clean enzyme into a pulp pipe in front of a fan pump at the approach part of the paper machine, wherein the clean enzyme is polyamide hydrolase, and the addition amount of the clean enzyme is 150-250g/t paper.
2. The method according to claim 1, wherein the polyamide hydrolase consists of the enzymes E3 and PAMI produced by the strain K172.
3. The method as claimed in claim 2, wherein the ratio of the activities of E3 enzyme and PAMI enzyme produced by the strain K172 producing yellow in the polyamide hydrolase is (0.1-0.3): (1.5-120).
4. The method as claimed in claim 1, wherein the ratio of the activities of E3 enzyme and PAMI enzyme produced by the xanthogenic strain K172 in the polyamide hydrolase is 0.2: 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911139916.4A CN110983851A (en) | 2019-11-20 | 2019-11-20 | Method for improving operation efficiency of drying part of paper machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911139916.4A CN110983851A (en) | 2019-11-20 | 2019-11-20 | Method for improving operation efficiency of drying part of paper machine |
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| CN110983851A true CN110983851A (en) | 2020-04-10 |
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| CN201911139916.4A Pending CN110983851A (en) | 2019-11-20 | 2019-11-20 | Method for improving operation efficiency of drying part of paper machine |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3503139A (en) * | 1968-03-11 | 1970-03-31 | Beloit Corp | Apparatus for drying fibrous webs on external drums |
| CN1193347A (en) * | 1995-07-18 | 1998-09-16 | 罗纳普朗克纤维和聚合物股份有限公司 | Enzymes and microorganisms having amidase activity for hydrolysing polyamides |
| CN1193348A (en) * | 1995-07-18 | 1998-09-16 | 罗纳普朗克纤维和聚合物股份有限公司 | Enzymes and micro-organisms with amidase activity for hydrolysing polyamides |
| CN1423717A (en) * | 1999-11-19 | 2003-06-11 | 巴科曼实验室国际公司 | Paper making processes using enzyme and polymer compositions |
| CN103835174A (en) * | 2012-11-27 | 2014-06-04 | 广州瑞辰盛达生物技术有限公司 | Wet-strength waste paper pulping method |
| CN105887551A (en) * | 2016-06-06 | 2016-08-24 | 瑞辰星生物技术（广州）有限公司 | Device and method for catching sticky matter in pulping and papermaking system |
-
2019
- 2019-11-20 CN CN201911139916.4A patent/CN110983851A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3503139A (en) * | 1968-03-11 | 1970-03-31 | Beloit Corp | Apparatus for drying fibrous webs on external drums |
| CN1193347A (en) * | 1995-07-18 | 1998-09-16 | 罗纳普朗克纤维和聚合物股份有限公司 | Enzymes and microorganisms having amidase activity for hydrolysing polyamides |
| CN1193348A (en) * | 1995-07-18 | 1998-09-16 | 罗纳普朗克纤维和聚合物股份有限公司 | Enzymes and micro-organisms with amidase activity for hydrolysing polyamides |
| CN1423717A (en) * | 1999-11-19 | 2003-06-11 | 巴科曼实验室国际公司 | Paper making processes using enzyme and polymer compositions |
| CN103835174A (en) * | 2012-11-27 | 2014-06-04 | 广州瑞辰盛达生物技术有限公司 | Wet-strength waste paper pulping method |
| CN105887551A (en) * | 2016-06-06 | 2016-08-24 | 瑞辰星生物技术（广州）有限公司 | Device and method for catching sticky matter in pulping and papermaking system |
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