CN110983848A - Preparation process of bamboo unbleached pulp - Google Patents
Preparation process of bamboo unbleached pulp Download PDFInfo
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- CN110983848A CN110983848A CN201911075277.XA CN201911075277A CN110983848A CN 110983848 A CN110983848 A CN 110983848A CN 201911075277 A CN201911075277 A CN 201911075277A CN 110983848 A CN110983848 A CN 110983848A
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- bamboo
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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
- D21C7/00—Digesters
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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
- D21C3/00—Pulping cellulose-containing materials
- D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
- D21H11/04—Kraft or sulfate pulp
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Paper (AREA)
Abstract
The invention discloses a preparation process of bamboo unbleached pulp, which comprises the following steps: (1) the steam pot filling device is utilized to improve the weight of the bamboo chips in the pot and ensure the quality of the pot; (2) heating the bamboo chips by using low-pressure steam, and steaming the bamboo chips in a digester to a target temperature; (3) neutralizing acid oxides on the surface of the bamboo chips and cleaning the bamboo chips by using white liquor; (4) pumping a proper amount of hot black liquor and hot white liquor from the bottom of the digester according to the target hardness requirement and alkali consumption of the slurry after cooking; (5) directly heating a proper amount of medium-pressure steam to a target cooking temperature, and controlling the cooking degree by using an H factor; (6) replacing the black liquor in the digester with the black liquor in the screening and washing section for recycling, and cooling the slurry temperature of the digester; (7) emptying the pulp of the cooking pot by using a pulp pump; (8) and preparing the bamboo unbleached pulp with the target pulp hardness. The invention aims at the characteristics of the bamboo raw material, adjusts the process design and the operation parameters of the replacement cooking system, and can produce the pulp meeting the market demand.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of pulping and papermaking, in particular to a preparation process of bamboo unbleached pulp.
[ background of the invention ]
China has abundant non-wood fiber resources. The bamboos are mainly distributed in Fujian, Sichuan, Guangxi, Guangdong, Guizhou, Yunnan, Zhejiang and other provinces in south, and have obvious regionality and territoriality. Bamboo belongs to a long medium fiber raw material, has large length-width ratio, high cellulose content and low ash content (higher than wood), and is an excellent papermaking fiber raw material.
The fiber cells of the bamboo raw material generally account for 60-70% of the total area of the cells, and are slightly lower than wood and higher than common grass. The bamboo has different fiber forms from wood, wood fiber has corrugated holes, bamboo fiber has few and very small corrugated holes, bamboo has fiber properties similar to broad leaf wood, and is better than general grass, and bamboo has fiber forms different from various kinds of wood. The bamboo fiber has the comprehensive morphological characteristics that: the fiber is slender, the wall thickness cavity is small, the density is high, the fiber is stiffer, and the transparency is high.
The invention relates to a preparation process of bamboo unbleached pulp, which belongs to a displacement cooking system, aims at the problems that the bamboo structure is compact, air is sealed in a guide pipe after a bamboo sheet is dried, and cooking liquor is not easy to permeate, adjusts and optimizes the alkali consumption, temperature and time of each stage of cooking, and keeps the low-temperature cooking target temperature, so that the cooking yield of bamboo reaches 50-52 percent, improves about 2-3 percent compared with the traditional cooking, reduces the alkali consumption, and improves the whiteness and the strength of paper pulp.
[ summary of the invention ]
The invention aims to solve the technical problem that aiming at the characteristics of bamboo raw materials, the process design and the operation parameters of a replacement cooking system are adjusted, so that the bamboo chips are cooked successfully in the original dissolving pulp DP pulping production line.
In order to achieve the technical purpose, the design scheme of the invention is as follows:
a preparation process of bamboo unbleached pulp comprises the following steps:
(1) loading normal bamboo chips into a pot: the steam pot filling device is utilized to improve the weight of the bamboo chips in the pot and ensure the quality of the pot;
(2) steaming the bamboo chips: heating the bamboo chips by using low-pressure steam, and steaming the bamboo chips in a digester to a target temperature of 120 ℃;
(3) white liquor neutralization: neutralizing acid oxides on the surface of the bamboo chips and cleaning the bamboo chips by using white liquor;
(4) hot liquid filling: pumping a proper amount of hot black liquor and hot white liquor from the bottom of the digester according to the target hardness requirement and alkali consumption of the slurry after cooking;
(5) and (3) cooking: directly heating a proper amount of medium-pressure steam to a target cooking temperature, and controlling the cooking degree by using an H factor;
(6) and (3) replacement: replacing the black liquor in the digester with the black liquor in the screening and washing section for recycling, and cooling the slurry in the digester to a temperature below 100 ℃;
(7) cold spraying: emptying the pulp of the cooking pot by using a pulp pump;
(8) normal screening and washing procedures: the bamboo unbleached pulp with the target pulp hardness is prepared and used for producing unbleached pulp bamboo unbleached household paper and cultural paper.
Preferably, the bamboo chips in step (1) are moso bamboo chips.
Preferably, the moso bamboo sheet thickness ≦ 6 mm.
Preferably, the moisture content of the bamboo chips is 40-45%.
Preferably, the pressure of the low-pressure steam in the step (2) is ≧ 350 Kpa.
Preferably, the concentration of the white liquor active alkali AA in the step (3) is 120 g/l; and (3) vulcanization degree: 27%; white liquor temperature: at 75 ℃.
Preferably, the hot black liquor in step (4) is 400m3。
Preferably, the amount of the thermal white liquor in the step (4) is 170m3。
Preferably, the pressure of the medium-pressure steam in the step (5) is equal to or greater than 1050 Kpa.
Preferably, the H factor in step (5) is 700.
Through this technical scheme, can realize following effect:
(1) the invention discloses a replacement cooking preparation process of bamboo natural color KP pulp, which adopts steam to fill a pot, properly steams bamboo chips, prolongs the time of hot injection of alkali liquor (primary cooking), ensures that sufficient permeation time exists in a low-temperature stage, can effectively discharge air in a bamboo chip capillary, ensures that liquid medicine permeates uniformly and quickly, and realizes the effect of low-temperature large-amount delignification.
(2) The preparation process of the bamboo unbleached pulp can furthest reserve the strength performance of the raw pulp bamboo fiber and the high-yield natural color bamboo pulp because the cooking target temperature is as low as 150 ℃ under the condition of cooking the raw pulp with a lower kappa number.
(3) The bamboo unbleached pulp preparation process provided by the invention is a production process method for preparing the sulfate process bamboo unbleached KP chemical pulp by using easily available bamboo as a cooking raw material, efficiently utilizes local high-quality bamboo fiber resources, and obtains the win-win effects of expanding bamboo forest bases, promoting agriculture and income, greening mountains, guaranteeing resources and the like by implementing forest pulp paper industrialized operation, thereby powerfully promoting the development of regional economy and ecological environment.
[ description of the drawings ]
FIG. 1 is a schematic view of a process flow for preparing a bamboo unbleached pulp of the invention;
FIG. 2 is a schematic view of the bamboo chips being loaded into the pot;
FIG. 3 is a schematic diagram of bamboo chip steaming;
FIG. 4 is a schematic of neutralization;
FIG. 5 is a schematic of a hot liquid fill;
FIG. 6 is a schematic view of thermal cooking;
fig. 7 is a displacement diagram.
[ detailed description ] embodiments
In order to facilitate a better understanding of the invention, the following examples are given to illustrate, but not to limit the scope of the invention.
A preparation process of bamboo unbleached pulp comprises the following steps:
(1) loading normal bamboo chips into a pot: the steam pot filling device is utilized to improve the weight of the bamboo chips in the pot and ensure the quality of the pot;
(2) steaming the bamboo chips: heating the bamboo chips by using low-pressure steam, and steaming the bamboo chips in a digester to a target temperature of 120 ℃;
(3) white liquor neutralization: neutralizing acid oxides on the surface of the bamboo chips and cleaning the bamboo chips by using white liquor;
(4) hot liquid filling: pumping a proper amount of hot black liquor and hot white liquor from the bottom of the digester according to the target hardness requirement and alkali consumption of the slurry after cooking;
(5) and (3) cooking: directly heating a proper amount of medium-pressure steam to a target cooking temperature, and controlling the cooking degree by using an H factor;
(6) and (3) replacement: replacing the black liquor in the digester with the black liquor in the screening and washing section for recycling, and cooling the slurry in the digester to a temperature below 100 ℃;
(7) cold spraying: emptying the pulp of the cooking pot by using a pulp pump;
(8) normal screening and washing procedures: the bamboo unbleached pulp with the target pulp hardness is prepared and used for producing unbleached pulp bamboo unbleached household paper and cultural paper.
In the step (1), the bamboo chips are moso bamboo chips.
The thickness of the moso bamboo chips is less than or equal to 6 mm.
The water content of the bamboo chips is 40-45%.
The pressure of the low-pressure steam in the step (2) is not less than 350 Kpa.
In the step (3), the concentration AA of the white liquor active alkali is 120 g/l; and (3) vulcanization degree: 27%; white liquor temperature: at 75 ℃.
The hot black liquor in the step (4) is 400m3。
The hot white liquor in the step (4) is 170m3。
The pressure of the medium-pressure steam in the step (5) is not less than 1050 Kpa.
The H factor in the step (5) is 700.
The present invention is illustrated by the following more specific examples.
Example 1
As shown in figure 1, the preparation process of the bamboo unbleached pulp comprises the following steps:
(1) loading normal bamboo chips into a pot: the steam pot filling device is utilized to improve the weight of the bamboo chips in the pot and ensure the quality of the pot;
(2) steaming the bamboo chips: heating the bamboo chips by using low-pressure steam, and steaming the bamboo chips in a digester to a target temperature of 120 ℃;
(3) white liquor neutralization: by 20m3The white liquor neutralizes acid oxides on the surface of the bamboo chips and cleans the bamboo chips;
(4) hot liquid filling: pumping a proper amount of hot black liquor and hot white liquor from the bottom of the digester according to the target hardness requirement and alkali consumption of the slurry after cooking;
(5) and (3) cooking: directly heating a proper amount of medium-pressure steam to a target cooking temperature, and controlling the cooking degree by using an H factor;
(6) and (3) replacement: replacing the black liquor in the digester with the black liquor in the screening and washing section for recycling, and cooling the slurry in the digester to a temperature below 100 ℃;
(7) cold spraying: emptying the pulp of the cooking pot by using a pulp pump;
(8) normal screening and washing procedures: the bamboo unbleached pulp with the target pulp hardness is prepared and used for producing unbleached pulp bamboo unbleached household paper and cultural paper.
The basic parameters of the production line design operation and raw material and auxiliary material are as follows.
A cooking pan: 3X 400m3
Capacity: dissolving pulp DP is 350 adt/d; bamboo natural color KP pulp is 360adt/d
The types of bamboo chips are as follows: fujian local mao bamboo
Basic density of the bamboo chips: 462Kg/m3(2 years old); 484Kg/m3(5 years old)
Bulk density of bamboo chips: ≧ 190Kg/m3
The specification requirement of the bamboo chips is as follows: the length of the bamboo chips is 15 mm-25 mm
The thickness of the bamboo chips is less than or equal to 6mm
The ratio of bamboo chips left in each sieve layer is as follows: 40mm x 40mm ≦ 1%; 5mm x 5mm ≦ 3%
Moisture of bamboo chips: 40 to 45 percent of the raw material is not washed by water; about 49 percent of bamboo chips washed by water
Hardness K of the cooked slurry: dissolving pulp DP-12 kappa number; natural color KP chemical bamboo pulp ≧ 18 kappa number
White liquor: concentration of active alkali AA 120g/l (measured by NaOH)
And (3) vulcanization degree: 27 percent of
Temperature of cold white liquor: 75 deg.C
Medium pressure steam (saturated): pressure ≧ 1050Kpa
Low pressure steam (saturated): pressure ≧ 350Kpa
The DCS automatic control engineer rebuilds a set of program control modes suitable for cooking the natural-color chemical KP bamboo pulp by referring to the original program control mode of a cooking cycle of the dissolving pulp DP, namely, the same DCS control platform can flexibly select and switch different cooking program control modes according to the dissolving pulp or the natural-color pulp.
The program control of one cooking period of the bamboo unbleached pulp comprises the following 7 subprograms:
(1) normal bamboo chip pot
(2) Bamboo chip steaming
(3) Neutralization
(4) Hot liquid filling
(5) Steaming and boiling
(6) Replacement of
(7) Cold spray discharge
(8) Normal screening and washing process
One cooking period of the bamboo unbleached pulp: (compare the original wood color paste for one cooking period)
Note: the high and low pressure steam pressure in the public system affects the steaming, hot injection and cooking process time.
Example 2
According to the arrangement of the applied production warp, the pulp production line tries to produce bamboo pulp (containing natural color bamboo pulp and bamboo pulp) for the first time in history of 5 months, 29 days to 6 months and 2 days in 2019, and produces 23.5 pots in a co-production mode, wherein the natural color bamboo pulp is 6 pots (20184 pots in 5 months, 29 days to 20189 pots in 30 days); the bamboo pulp is cooked in 17.5 pans (5 months 30 days 20190 pans for times-6 months 2 days 20207 pans for times). 316.619 tons of bamboo natural color pulp plates are produced, and 52.770 air-dried tons of pulp are produced per pot; the bamboo pulp is produced by 623.635 tons, and the output of the boiler pulp is 35.636 air-dried tons per boiler. The feasibility of large-scale industrial production of the natural color bamboo pulp preparation technology is demonstrated.
The production cycle of the bamboo unbleached pulp by one stewing is as follows:
(1) loading normal bamboo chips into a pot: as shown in fig. 2, the bamboo chips are added by a belt conveyer and exhausted by a cyclone separator and a fan; the low-pressure steam is used for uniformly filling the pot and improving the pot filling amount.
(2) Steaming the bamboo chips:
as shown in figure 3, the bamboo chips are heated by low-pressure steam or medium-pressure steam, the steam enters the digester through the replacement sieve plates at the bottom and the top of the digester, and the target steaming temperature of the bamboo chips is about 120 ℃.
(3) Neutralizing: as shown in fig. 4, 20m is used3The white liquor neutralizes acid oxides on the surface of the bamboo chips and cleans the bamboo chips.
(4) Hot liquid filling: as shown in FIG. 5, 400m was pumped into the bottom of the digester3Hot black liquor and the balance hot white liquor (white liquor amount is adjusted according to alkali amount and target slurry hardness)
(5) Heating and cooking: as shown in fig. 6, the cooking time is about 100min by using direct steam (steam nozzle) or indirect heating to a target cooking temperature such as 150 ℃, and controlling the cooking degree such as H factor setting 700 by using H factor.
(6) And (3) replacement: as shown in figure 7, the black liquor at about 78 ℃ in the displacement liquor tank is used for displacing the high-temperature black liquor in the digester for recycling, the temperature of the pulp in the digester is reduced to be below 100 ℃, and the displacement time is about 80 min.
(7) Cold spraying: and (3) discharging the pulp of the emptying digester by using a pulp pump, diluting the pulp by using a displacement pump during the discharging period, wherein the temperature of the discharged pulp is below 100 ℃, and the discharging time is within about 30 min.
(8) Normal screening and washing procedures: the bamboo unbleached pulp with the target pulp hardness is prepared and used for producing bamboo unbleached pulp board bamboo household paper, cultural paper and the like.
The quality conditions of the finished bamboo unbleached pulp sheet prepared by adopting the preparation process route of the bamboo unbleached pulp in the embodiment 2 are shown in the following table:
quality condition of finished bamboo natural color pulp board
As can be seen from the table above, the bamboo unbleached pulp with qualified quality can be prepared by adopting the preparation process route of the bamboo unbleached pulp.
The above-mentioned embodiments are only preferred embodiments of the present invention, and do not limit the technical scope of the present invention, so that the changes and modifications made by the claims and the specification of the present invention should fall within the scope of the present invention.
Claims (10)
1. The preparation process of the bamboo unbleached pulp is characterized by comprising the following steps of:
(1) the steam pot filling device is utilized to improve the weight of the bamboo chips in the pot and ensure the quality of the pot;
(2) heating the bamboo chips by using low-pressure steam, and steaming the bamboo chips in a digester to a target temperature of 120 ℃;
(3) neutralizing acid oxides on the surface of the bamboo chips and cleaning the bamboo chips by using white liquor;
(4) pumping a proper amount of hot black liquor and hot white liquor from the bottom of the digester according to the target hardness requirement and alkali consumption of the slurry after cooking;
(5) directly heating a proper amount of medium-pressure steam to a target cooking temperature, and controlling the cooking degree by using an H factor;
(6) replacing the black liquor in the digester with the black liquor in the screening and washing section for recycling, and cooling the slurry in the digester to a temperature below 100 ℃;
(7) emptying the pulp of the cooking pot by using a pulp pump;
(8) the bamboo unbleached pulp with the target pulp hardness is prepared and used for producing unbleached pulp bamboo unbleached household paper and cultural paper.
2. The process for preparing bamboo unbleached pulp according to claim 1, characterized in that the bamboo chips in the step (1) are moso bamboo chips.
3. The process for preparing bamboo unbleached pulp according to claim 2, wherein the thickness of the moso bamboo chips is less than or equal to 6 mm.
4. The process for preparing bamboo unbleached pulp according to claim 3, characterized in that the water content of the bamboo chips is 40-45%.
5. The process for preparing bamboo unbleached pulp according to claim 1, wherein the pressure of the low-pressure steam in the step (2) is not less than 350 Kpa.
6. The process for preparing bamboo unbleached pulp according to claim 1, wherein the concentration of the white liquor active alkali AA in the step (3) is 120 g/l; and (3) vulcanization degree: 27%; white liquor temperature: at 75 ℃.
7. The process for preparing bamboo unbleached pulp according to claim 1, characterized in that the hot black liquor in the step (4) is 400m3。
8. The process for preparing bamboo unbleached pulp according to claim 1, characterized in that the amount of the hot white liquid in the step (4) is 170m3。
9. The process for preparing bamboo unbleached pulp according to claim 1, wherein the pressure of the medium-pressure steam in the step (5) is not less than 1050 Kpa.
10. The process for preparing bamboo unbleached pulp according to claim 1, characterized in that the H factor in step (5) is 700.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007102638A1 (en) * | 2006-03-09 | 2007-09-13 | Kwon-Hyok Lee | Method for producing xylose from bamboos |
| CN102127877A (en) * | 2010-12-28 | 2011-07-20 | 宜宾竹海竹资源科技有限责任公司 | Production process of bamboo-dissolving pulp |
| CN102337689A (en) * | 2011-09-30 | 2012-02-01 | 重庆理文造纸有限公司 | Stewing method for preparing bamboo wood dissolving pulp |
| CN102337684A (en) * | 2011-09-30 | 2012-02-01 | 重庆理文造纸有限公司 | Vapor pre-hydrolysis technique for material slice of bamboo wood dissolving pulp |
| CN102352572A (en) * | 2011-09-30 | 2012-02-15 | 重庆理文造纸有限公司 | Preparation method for bamboo wood dissolving pulp |
| CN102493257A (en) * | 2011-12-07 | 2012-06-13 | 湖南骏泰浆纸有限责任公司 | Masson pine dissolving pulp and production method thereof |
| CN102888772A (en) * | 2012-10-17 | 2013-01-23 | 四川永丰纸业股份有限公司 | Method for preparing bamboo pulp by replacing cooking sulfate with steaming sulfate |
| CN102978993A (en) * | 2012-11-26 | 2013-03-20 | 四川银鸽竹浆纸业有限公司 | Bamboo fiber dissolving pulp and production technology thereof |
| CN103352385A (en) * | 2013-06-28 | 2013-10-16 | 汶瑞机械(山东)有限公司 | Energy-saving and environment-friendly displacement cooking process for wood and bamboo raw materials |
-
2019
- 2019-11-06 CN CN201911075277.XA patent/CN110983848A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007102638A1 (en) * | 2006-03-09 | 2007-09-13 | Kwon-Hyok Lee | Method for producing xylose from bamboos |
| CN102127877A (en) * | 2010-12-28 | 2011-07-20 | 宜宾竹海竹资源科技有限责任公司 | Production process of bamboo-dissolving pulp |
| CN102337689A (en) * | 2011-09-30 | 2012-02-01 | 重庆理文造纸有限公司 | Stewing method for preparing bamboo wood dissolving pulp |
| CN102337684A (en) * | 2011-09-30 | 2012-02-01 | 重庆理文造纸有限公司 | Vapor pre-hydrolysis technique for material slice of bamboo wood dissolving pulp |
| CN102352572A (en) * | 2011-09-30 | 2012-02-15 | 重庆理文造纸有限公司 | Preparation method for bamboo wood dissolving pulp |
| CN102493257A (en) * | 2011-12-07 | 2012-06-13 | 湖南骏泰浆纸有限责任公司 | Masson pine dissolving pulp and production method thereof |
| CN102888772A (en) * | 2012-10-17 | 2013-01-23 | 四川永丰纸业股份有限公司 | Method for preparing bamboo pulp by replacing cooking sulfate with steaming sulfate |
| CN102978993A (en) * | 2012-11-26 | 2013-03-20 | 四川银鸽竹浆纸业有限公司 | Bamboo fiber dissolving pulp and production technology thereof |
| CN103352385A (en) * | 2013-06-28 | 2013-10-16 | 汶瑞机械(山东)有限公司 | Energy-saving and environment-friendly displacement cooking process for wood and bamboo raw materials |
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Application publication date: 20200410 |