CN109338775B - Environment-friendly straw bio-mechanical pulping process - Google Patents
Environment-friendly straw bio-mechanical pulping process Download PDFInfo
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- CN109338775B CN109338775B CN201811165365.4A CN201811165365A CN109338775B CN 109338775 B CN109338775 B CN 109338775B CN 201811165365 A CN201811165365 A CN 201811165365A CN 109338775 B CN109338775 B CN 109338775B
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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
- D21C1/00—Pretreatment of the finely-divided materials before digesting
- D21C1/02—Pretreatment of the finely-divided materials before digesting with water or steam
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/14—Disintegrating in mills
- D21B1/16—Disintegrating in mills in the presence of chemical agents
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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
- D21C1/00—Pretreatment of the finely-divided materials before digesting
- D21C1/10—Physical methods for facilitating impregnation
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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
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/005—Treatment of cellulose-containing material with microorganisms or enzymes
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- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
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- Mechanical Engineering (AREA)
- Biochemistry (AREA)
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- Processing Of Solid Wastes (AREA)
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Abstract
The invention provides a closed-loop environment-friendly straw bio-mechanical pulping process, which is characterized in that straw is subjected to coarse crushing, fine crushing, water washing, steam softening, dipping thread rolling, bio-enzyme treatment, high-concentration pulping and other treatment, solid waste and waste liquid generated and concentrated by a system are mixed, then are subjected to briquetting granulation and are used for combustion power generation, straw pulping is realized, a closed-loop pollution-free treatment mode is adopted, the environment is protected, and a new method for straw pulping and papermaking is created.
Description
Technical Field
The invention relates to a pulping process, in particular to an environment-friendly straw bio-mechanical pulping process.
Background
China is the country of the earliest invention of the papermaking technology and is a big papermaking country, but the papermaking technology in China is still relatively laggard and mainly adopts a chemical pulping process or a chemical mechanical process. The chemical pulping process needs a large amount of chemical reagents in the pulping process, a large amount of black liquor can be discharged in the pulping and cooking process, the black liquor is a main source of pollution, direct discharge causes direct pollution of water sources, and great harm is brought to the lives of people.
Trees are common papermaking raw materials, but due to the fact that excessive felling causes great damage to the environment, people begin to search for renewable alternative raw materials. The straws are very good raw materials, a large amount of straws can be produced after the straws are harvested in a farmland, the straws are burnt to produce a large amount of dust to pollute the environment, and the straws are not burnt in many places under the standard, so that the straws are very sufficient raw materials for papermaking, and the straws are low in price and cannot damage the ecological environment. However, most paper making enterprises still adopt the laggard chemical pulping process for pulping at present, and the environmental pollution is serious. When straw pulping is adopted, the straw needs to be crushed, the traditional technology has low qualification rate, dust flies and pollution is serious in the crushing and material preparation process. Moreover, when a digester is used for cooking, the temperature is high, the temperature needs to reach about 160-. The straw bridging phenomenon can also occur in the cooking process, which causes the problem of conveying and discharging.
In order to reach the environmental standard, many enterprises purchase black liquor treatment devices without investing heavy gold, so that the investment is huge, the production cost of the enterprises is increased, and the enterprise development is seriously influenced.
Disclosure of Invention
Aiming at various problems of the existing papermaking process, the invention provides the environment-friendly straw pulping process, which effectively solves the pollution problem generated by the traditional chemical pulping process and has low energy consumption and high yield.
The environment-friendly straw bio-mechanical pulping process is as follows:
a closed-loop environment-friendly straw bio-mechanical pulping process comprises the following steps:
(1) carrying out coarse crushing treatment on the straws, and cutting the straws into coarse materials with the length of 8-10 cm;
(2) carrying out fine crushing treatment on the coarse material, cutting the coarse material into fine material with the length of 3-5cm, and tearing the stem in the radial direction;
(3) washing the fine materials with water;
(4) steam-steaming and softening the washed materials;
(5) soaking the fine material in the liquid medicine and brooming to coarse fiber;
(6) carrying out biological enzyme treatment in a bioreactor;
(7) and (5) performing high-concentration pulping.
Preferably, a plurality of spiral conveying pipes are adopted during the steam softening treatment, and connecting pipes are arranged among the spiral conveying pipes.
Preferably, after the solid waste (referred to as "solid waste") generated in the coarse crushing and fine crushing steps is mixed with the concentrated waste black liquor generated in the subsequent process, briquetting and granulation are carried out for combustion power generation.
Preferably, in the step (4), the steam temperature is 80-100 ℃ and the time is 15-20 minutes.
Preferably, in the step (1) and the step (2), negative pressure dust removal treatment is performed.
Preferably, two transversely arranged spiral conveying pipes are adopted in the steam softening treatment or the biological enzyme treatment, and a connecting pipe is arranged between the tail ends of the two spiral conveying pipes.
The environment-friendly straw bio-mechanical pulping process combines biotechnology with mechanical technology and the like, takes the straw as a raw material, replaces chemical reaction by biotransformation, does not need cooking, does not discharge any sewage, does not pollute the environment and has high pulping yield.
Drawings
FIG. 1 is a flow chart of the environment-friendly straw bio-mechanical pulping process of the present invention.
Fig. 2 is a schematic view of an apparatus employed in the dry stock preparation process of the present invention.
Fig. 3 is a schematic view of an apparatus used in the steam softening treatment step of the present invention.
The reference numerals in the drawings denote: 1. coarse crushing, 2, fine crushing, 3, a dust remover, 4 and a conveyor.
Detailed Description
The environment-friendly straw bio-mechanical pulping process combines biotechnology with mechanical technology and the like, takes the straw as a raw material, and replaces chemical reaction with biotransformation.
The pulping process of the invention comprises the following steps: (1) carrying out coarse crushing treatment on the straws, and cutting the straws into coarse materials with the length of 8-10 cm;
(2) carrying out fine crushing treatment on the coarse material, cutting the coarse material into fine material with the length of 3-5cm, and tearing the stem in the radial direction;
(3) washing the fine materials with water to remove silt in the raw materials; dust.
(4) Carrying out steam softening treatment on the fine materials;
(5) soaking the fine material in the liquid medicine and brooming to coarse fiber;
(6) carrying out biological enzyme treatment in a bioreactor, and directionally reacting non-fibrous organic matters in raw materials by using the biological enzyme.
(7) And (4) performing high-concentration pulping to dissociate coarse fibers into fine fibers.
In traditional straw crushing treatment, because the during operation is the open-type operation, can produce a large amount of dusts in crushing process, the dust flies upward and both pollutes the environment and can cause the harm to operating personnel health again. Aiming at the problems, the invention adopts a process combining coarse crushing and fine crushing, as shown in figure 2, firstly, straws are cut into coarse materials with the length of 8-10cm, then the coarse materials are cut into fine materials with the length of 3-5cm, and the straws are radially torn apart during the fine crushing process so as to increase the specific surface area and be beneficial to the subsequent biological enzyme reaction.
A closed negative pressure dust removal system is preferably adopted during crushing, dust generated during crushing can be collected by the dust removal system through the system, so that the dust cannot pollute the environment, and collected dust waste can be used as fuel for combustion power generation to realize waste recycling.
After the crushing treatment, the crushed fine materials need to be washed with water to wash away dust and part of sugar. The waste black liquor generated at the moment can be recycled in the process, and can be briquetted and granulated together with the solid waste generated in the process after evaporation and concentration to prepare biomass fuel which is conveyed to a power station for combustion and power generation.
The fines are then subjected to a steam softening treatment. A plurality of spiral conveying pipes can be adopted during steam softening treatment, and connecting pipes are arranged among the spiral conveying pipes. As shown in fig. 3, two spiral conveying pipes are adopted and are connected end to end. The steam softening treatment can be carried out under normal pressure at 80-100 deg.C for 15-20 min. The traditional chemical pulping process has high cooking temperature of 160-170 ℃ and higher pressure. The steam softening treatment of the present invention has very significant advantages.
After steam softening treatment, the biological enzyme treatment is carried out in a bioreactor, and in the biological enzyme treatment, the steam softening treatment device is also preferably used, namely, as shown in figure 3, two spiral conveying pipes are adopted, and the tail parts of the two spiral conveying pipes are connected through a connecting pipe. The spiral stirring is beneficial to the more full biological enzyme reaction and the discharging. The waste black liquor generated in the biological enzyme treatment can be recycled in the process, and can be briquetted and granulated together with the solid waste generated in the process after evaporation and concentration to prepare biomass fuel which is conveyed to a power station for combustion and power generation.
Finally, high consistency refining is performed to obtain the desired pulp. High consistency refining is mechanical pulping and may be carried out using processes commonly used in the art.
Through the environment-friendly straw pulping process, waste liquid/waste materials generated in various links such as dust removal, water washing, steam softening treatment and the like can be clearly seen to be recycled and used for combustion power generation, and the whole system does not generate any pollution and is beneficial to the environment.
Meanwhile, the biological technology is combined with the mechanical technology, the straw is used as a raw material, the chemical reaction is replaced by biotransformation, the cooking is not needed, any sewage is not discharged, the environment is not polluted, and the pulping yield is high.
In addition, the straw-based raw material in the present invention includes, but is not limited to, grass-based fibers represented by wheat straw, rice straw, reed, cotton stalk, and the like.
Claims (1)
1. An environment-friendly straw bio-mechanical pulping process, wherein straw is grass fiber, comprising the following steps:
(1) carrying out coarse crushing treatment on the straws, and cutting the straws into coarse materials with the length of 8-10 cm;
(2) carrying out fine crushing treatment on the coarse material, cutting the coarse material into fine material with the length of more than 3cm and less than 5cm, and tearing the stem in the radial direction;
(3) washing the fine materials with water;
(4) steam-steaming and softening the washed materials;
in the step (4), two transversely arranged spiral conveying pipes are adopted during steam softening treatment, and a connecting pipe is arranged between the tail ends of the two spiral conveying pipes; the steam softening treatment adopts normal pressure, the steam temperature is 80-100 ℃, and the time is 15-20 minutes;
(5) the steamed material is soaked in the liquid medicine and broomed into coarse fiber;
(6) carrying out biological enzyme treatment in a bioreactor;
in the step (6), the bioreactor adopts two spiral conveying pipes which are transversely arranged, and a connecting pipe is arranged between the tail ends of the two spiral conveying pipes;
(7) carrying out high-concentration grinding;
and (3) carrying out negative pressure dust removal treatment by adopting a closed negative pressure dust removal system, evaporating and concentrating the waste black liquor generated by water washing in the step (3) and the waste black liquor generated by biological enzyme treatment in the step (6), and briquetting and granulating the waste black liquor and the solid waste generated in the steps of coarse crushing treatment and fine crushing treatment together to prepare biomass fuel, and conveying the biomass fuel to a power station for combustion and power generation.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109930413B (en) * | 2019-04-18 | 2024-06-14 | 丹东东方轻工机械有限公司 | Biological environment-friendly pulping system for plant raw materials |
| CN110714351A (en) * | 2019-09-29 | 2020-01-21 | 山东世纪阳光纸业集团有限公司 | Process for pulping and papermaking of plant fiber in bio-mechanical or chemical-mechanical manner |
| CN112211022A (en) * | 2020-01-08 | 2021-01-12 | 北京鑫泽清源植物秸杆技术有限公司 | Method and device for fibering straw by hot pressing method |
| CN112553933A (en) * | 2020-12-04 | 2021-03-26 | 上海定业贸易有限公司 | Multi-section straw fiber slurry extraction method |
| CN114032701B (en) * | 2021-11-29 | 2024-06-14 | 广东省汇林包装科技集团有限公司 | Preparation method and application of straw semi-pulpifying raw material |
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