CN109208365B - Pulp production equipment, pulping process and pulp production process - Google Patents
Pulp production equipment, pulping process and pulp production process Download PDFInfo
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- CN109208365B CN109208365B CN201811229726.7A CN201811229726A CN109208365B CN 109208365 B CN109208365 B CN 109208365B CN 201811229726 A CN201811229726 A CN 201811229726A CN 109208365 B CN109208365 B CN 109208365B
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- 238000004537 pulping Methods 0.000 title claims abstract description 263
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 36
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 104
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 66
- 229910052742 iron Inorganic materials 0.000 claims abstract description 52
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 238000005096 rolling process Methods 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims description 102
- 239000002002 slurry Substances 0.000 claims description 46
- 238000000227 grinding Methods 0.000 claims description 30
- 230000005540 biological transmission Effects 0.000 claims description 24
- 239000010902 straw Substances 0.000 claims description 23
- 239000000835 fiber Substances 0.000 claims description 20
- 238000001125 extrusion Methods 0.000 claims description 10
- 241000209140 Triticum Species 0.000 claims description 9
- 235000021307 Triticum Nutrition 0.000 claims description 9
- 238000010009 beating Methods 0.000 claims description 9
- 206010061592 cardiac fibrillation Diseases 0.000 claims description 9
- 230000002600 fibrillogenic effect Effects 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 9
- 238000004898 kneading Methods 0.000 claims description 6
- 238000007670 refining Methods 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 4
- 229910000925 Cd alloy Inorganic materials 0.000 claims description 3
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 230000003749 cleanliness Effects 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 3
- 238000009987 spinning Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 8
- 239000002351 wastewater Substances 0.000 abstract description 6
- 230000005611 electricity Effects 0.000 description 7
- 235000014676 Phragmites communis Nutrition 0.000 description 6
- 229920001131 Pulp (paper) Polymers 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- 239000002023 wood Substances 0.000 description 5
- 229920005610 lignin Polymers 0.000 description 4
- 241000209094 Oryza Species 0.000 description 3
- 235000007164 Oryza sativa Nutrition 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 235000009566 rice Nutrition 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010411 cooking Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000010297 mechanical methods and process Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 229920002488 Hemicellulose Polymers 0.000 description 1
- 229920002522 Wood fibre Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 241001233061 earthworms Species 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- -1 fine particles Chemical compound 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 239000002025 wood fiber Substances 0.000 description 1
Classifications
-
- 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
- D21C3/22—Other features of pulping processes
- D21C3/26—Multistage processes
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
- D21D1/30—Disc mills
- D21D1/303—Double disc mills
-
- 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
Landscapes
- Paper (AREA)
Abstract
The invention discloses pulp production equipment, a pulping process and the pulp production process applied to the equipment, wherein the pulp production equipment comprises a pulping system, a circulating water system, a clear water pipeline system and a steam pipeline system, wherein the circulating water system, the clear water pipeline system and the steam pipeline system are respectively connected with the pulping system through pipelines, and the pulping system comprises a crushing device, a quantifying unit, a belt conveying device, an iron removing device, an oblique screw conveying device, a quantifying unit, a vertical screw conveying device, a squeezing and thread rolling machine, a multi-section pulping device, a pulp extruding machine and a belt conveying device which are sequentially arranged. The invention solves the problem of black liquor in the pulping process while obviously saving the heating cost, effectively improves the resource utilization rate and ensures that no waste water and waste materials are generated in the production process.
Description
Technical Field
The invention relates to the technical field of straw pulping, in particular to pulp production equipment, a pulping process and a pulp production process applied to the equipment.
Background
Crop straw and waste wood annual output in China reaches up to hundred million tons, but the comprehensive utilization rate is less than 40 percent. With the increase of the national environmental protection and the adjustment of rural energy structures, the living utilization rate of the straw and the waste wood is reduced, and a large number of paper factories and rice and wheat straw chemical pulp factories are closed, so that the reutilization rate of the straw and the waste wood is greatly reduced. At present, the waste straws are mostly treated in a burning way in rural areas, which causes serious pollution to the natural environment.
Therefore, how to effectively utilize materials such as straw, waste timber and the like and to efficiently produce paper pulp becomes a hot problem in the pulping industry. In the prior invention patents, a plurality of methods related to straw pulping are disclosed, for example, the application number is 200810225965.5, and the application discloses a preparation method of reed or straw cellulose pulp, which is to put reed or straw raw materials into steam explosion treatment equipment for gas explosion treatment, wash the reed or straw raw materials after the steam explosion treatment, and then soak the reed or straw raw materials in organic solvent for treatment so as to complete the cellulose pulping process. The technology adopted by the invention has the obvious advantages of shortening the process flow, saving energy and being beneficial to clean production.
The pulping process adopts the traditional alkaline pulping process to treat plant fibers by an alkaline agent, dissolve lignin in raw materials, and keep cellulose and hemicellulose as much as possible, and is characterized in that the raw materials react with a cooking agent to form pulp at high temperature and high pressure, and the reacted pulping waste liquid is called black liquid because of black color.
Accordingly, the present invention solves the problems of: solving the possible black liquor problem in the pulping process, reducing the cost and ensuring the environment-friendly production; aiming at the problem that the wastewater with larger water consumption in the pulping process is difficult to treat, new equipment is adopted to ensure the balance of supply and demand of water in the production process, and no wastewater is discharged in the production process; the equipment treatment process is simplified and the pulping energy consumption is reduced while the high pulp yield is ensured; the pulping product has stable performance and can be widely applied to different fields. In conclusion, on the basis of low energy consumption and low emission, and saving electric energy and water resources, the pulping yield and pulping quality are improved, so that the method is widely applied to different fields.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art and provides a paper pulp production device, a pulping process and a paper pulp production process applied to the device. The pulp production equipment provided by the invention can take wheat straw, rice straw, reed or wood chips as raw materials to obtain pulp with higher quality and stable product performance; the equipment solves the problem of black liquor possibly existing in the pulping process, greatly reduces the cost and ensures the environment-friendly production; aiming at the problem that the wastewater with larger water consumption in the pulping process is difficult to treat, the clean water pipeline and the circulating water system are arranged, so that the balance of water supply and demand in the production process is ensured, and no wastewater is discharged in the production process; the equipment treatment process is simplified and the pulping energy consumption is reduced while the high pulp yield is ensured.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a paper pulp production device comprises a pulping system, a circulating water system, a clear water pipeline system and a steam pipeline system, the circulating water system, the clear water pipeline system and the steam pipeline system are respectively connected with the pulping system through pipelines, wherein
The pulping system comprises a crushing device, a quantitative unit, a belt conveying device, an iron removing device, an inclined spiral conveying device, a quantitative unit, a vertical spiral conveying device, a crack squeezing thread rolling machine, a multi-section pulping device, a pulp squeezing machine and a belt conveying device which are sequentially arranged;
the multi-section pulping device comprises a first-section inclined spiral conveying device, a steam heating device, a first-section pulping machine, a second-section inclined spiral conveying device, a second-section pulping machine, a third-section inclined spiral conveying device, a third-section pulping machine, a fourth-section inclined spiral conveying device and a fourth-section pulping machine which are connected in sequence, wherein the fourth-section pulping machine is connected with the pulp extruding machine;
the circulating water system comprises a water return tank and a circulating water pipeline, and the circulating water pipeline is respectively connected to the inclined spiral conveying device, the first-section inclined spiral conveying device and the second-section inclined spiral conveying device through the water return tank to form a circulating loop;
the clear water pipeline system is correspondingly connected to the inclined spiral conveying device, the first-stage inclined spiral conveying device and the second-stage inclined spiral conveying device through clear water pipelines and the circulating water system respectively;
the steam pipeline system is connected to a section of inclined spiral conveying device through a steam pipeline.
Further, the circulating water pipeline is respectively connected to the inclined spiral conveying device and the first-stage inclined spiral conveying device and the second-stage inclined spiral conveying device of the multi-stage pulping device through the water return tank to form a circulating loop.
Further, the clear water pipeline system is respectively connected to the inclined spiral conveying device and the first-stage inclined spiral conveying device and the second-stage inclined spiral conveying device of the multi-stage pulping device through clear water pipelines.
Further, the steam pipeline system is connected to a section of inclined spiral conveying device of the multi-section pulping device through a steam pipeline.
Further, the pulping machine in the multi-stage pulping device is a high-concentration pulping machine.
Further, the high-concentration pulping machine comprises a feeding system, a pulping system, an adjusting moving system and a transmission system, wherein the feeding system comprises a feeding transmission body, a feeding port and a feeding spiral pipe which are sequentially connected, the pulping system comprises a fixed disc seat and a pulping chamber, the adjusting moving system comprises a micro-motion handle and a quick-motion handle, and the transmission system comprises a motor which is connected with the pulping system through a pin coupling, a main shaft and a bearing chamber.
Further, a rotor disc abrasive disc capable of moving axially and a stator disc abrasive disc fixed are arranged in the pulping chamber, the rotor disc abrasive disc is a multi-element nickel-cadmium alloy casting abrasive disc, and the stator disc abrasive disc is a silicon carbide composite abrasive disc.
Further, a flushing pipe is arranged above the pulping chamber, a shaft sleeve and a sealing sleeve are arranged between the pulping chamber and the bearing chamber, and the pulping chamber is sealed by a spinning fiber packing.
The invention also provides a pulping process which is applied to the multi-section pulping device of any one of claims 1 to 8, and the pulping process specifically comprises the following steps:
step 1: one-stage pulping
Placing the raw materials subjected to the fibrillation in a section of inclined spiral conveying device, adding a dryness regulator into the raw materials to enable the dryness of the raw materials to reach 50-70%, conveying the raw materials to a section of pulping machine at the temperature of 50-90 ℃ in the conveying stage; the pulp is kneaded and ground by a primary pulp grinder, the pulp grinding temperature is 70-110 ℃, primary pulp with the beating degree of 21-24 DEG SR is obtained, and the wet weight of fiber is 3-11g;
step 2: two-stage pulping
Feeding the first-stage pulping slurry into a second-stage inclined spiral conveying device, adding a dryness regulator to ensure that the dryness of the raw materials reaches 30-50%, and conveying the slurry to a second-stage pulping machine at the temperature of 80-110 ℃; the pulp is kneaded and ground by a two-stage pulp grinder, the pulp grinding temperature is 80-110 ℃, and the two-stage pulp with 24-28 DEG SR degree is obtained, and the wet weight of the fiber is 3-8g;
step 3: three-stage pulping
Feeding the second-stage pulping slurry into a three-stage inclined spiral conveying device, and conveying the slurry to a three-stage pulping machine; the three-stage pulping machine is used for carrying out kneading and grinding on the pulp, the pulping temperature is 90-110 ℃, and three-stage pulping pulp with the pulping degree of 28-33 DEG SR is obtained, and the wet weight is 2-5g;
step 4: four-stage pulping
Feeding the three-section pulping slurry into a four-section inclined spiral conveying device, and conveying the slurry to a four-section pulping machine; the four-stage pulping machine carries out fine grinding on the pulp, the pulping temperature is 90-110 ℃, and the four-stage pulping pulp with the pulping degree of 33-38 DEG SR is obtained, and the wet weight is 2-5g.
The invention also provides a pulp production process, which is applied to the pulp production equipment of any one of claims 1-8, and specifically comprises the following steps:
crushing the raw materials in the step (1):
primarily crushing wheat straw in a crushing device at a crushing rate of 2-4t/h, wherein the length of the primarily crushed wheat straw is 1-3cm;
and (2) iron removal treatment:
feeding the crushed raw materials in the step (1) into an iron removing device through a transmission device to perform iron removing treatment; the iron removal treatment is carried out in two stages, the crushed raw materials are firstly subjected to one-stage iron removal, iron-containing impurities such as scrap iron, iron nails, iron wires and the like in the raw materials are adsorbed by contacting with the surface of the raw materials, and then the iron-containing impurities in the raw materials are removed by two-stage iron removal, so that the cleanliness of the raw materials is further ensured; the ratio of the raw material treatment rate of the iron removal treatment step to the raw material crushing step is 1:3;
step (3) yarn splitting and fibrillation:
after iron removal treatment, adding a dryness regulator into a transmission device to regulate the dryness of the raw materials to 60-80%, and then entering a yarn splitting and brooming device through the transmission device to perform yarn splitting and brooming, wherein the yarn splitting and brooming are performed in a closed system, and the temperature in the closed system is 60-70 ℃; the raw material treatment rate of the step of separating silk and the step of removing iron is the same; after being divided into filaments and broomed, the length of the raw material is lower than 1cm;
pulping in the step (4):
the pulping comprises four continuous operation units which are positioned in the same closed system, namely a primary pulping unit, a secondary pulping unit, a tertiary pulping unit and a quaternary pulping unit, wherein each operation unit consists of raw material transmission and raw material pulping stages, and the raw material transmission rate is the same as the wire-dividing fibrillation rate;
the first-stage, second-stage, third-stage and fourth-stage pulping equipment adopts a high-concentration pulping machine;
and (3) pulping in one section: after the raw materials are divided into filaments and broomed, the raw materials enter a first-stage inclined spiral conveying device, steam at 100 ℃ is introduced to cure the raw materials, the dryness of the raw materials reaches 50-70%, the temperature in the conveying stage is 60-70 ℃, and the slurry is conveyed to a first-stage pulping machine; the pulp is kneaded and ground by a primary pulp grinder, the pulp grinding temperature is 80-90 ℃, the pulp grinding power is 160kw, and primary pulp with the beating degree of 21-24 SR is obtained, and the wet weight of fiber is 4-6g;
two-stage pulping: feeding the primary pulping slurry into a secondary inclined spiral conveying device, wherein the dryness of the raw materials reaches 30-50%, the temperature in the conveying stage is 80-90 ℃, and conveying the slurry to a secondary pulping machine; the pulp is kneaded and ground by a two-stage pulp grinder, the pulp grinding temperature is 80-90 ℃, the pulp grinding power is 160kw, and the two-stage pulp with 24-28 DEG SR degree is obtained, and the wet weight of the fiber is 3-5g;
three-stage pulping: feeding the second-stage pulping slurry into a three-stage inclined spiral conveying device, wherein the dryness of the raw materials reaches 30-50%, the temperature in the conveying stage is 85-95 ℃, and conveying the slurry to a three-stage pulping machine; the three-stage pulping machine is used for carrying out kneading and grinding on the pulp, the pulping temperature is 85-95 ℃, the pulping power is 132kw, and the three-stage pulping pulp with the pulping degree of 28-33 DEG SR is obtained, and the wet weight is 2-4g;
four-stage pulping: feeding the three-stage pulping slurry into a four-stage inclined spiral conveying device, wherein the dryness of the raw materials reaches 10-20%, the temperature in the conveying stage is 90-100 ℃, and conveying the slurry to a four-stage pulping machine; refining the slurry by a four-stage refiner, wherein the refining temperature is 90-100 ℃, the refining power is 132kw, and the four-stage pulping slurry with the beating degree of 33-38 DEG SR is obtained, and the wet weight is 1-3g;
step (5) pulp extrusion:
the raw materials are conveyed to a pulp extruding machine for pulp extrusion after pulp preparation, and a finished product is obtained after pulp extrusion.
The beneficial effects are that:
1. the equipment and the process provided by the invention effectively improve the resource utilization rate, are efficient and energy-saving, and are efficient and environment-friendly. High-efficiency electricity saving: compared with the prior pulping equipment, the invention adopts a mechanical method to soften the raw materials by heating only through steam, the mechanical method is adopted to knead the pulp by the pulp grinder to generate high-temperature heat in the production process, and combines the good heat preservation effect of a closed system formed by the conveying device and the pulp grinder, and the steam heating in only one section of inclined spiral conveying device is adopted to help, thereby not only saving the heating cost, but also being capable of efficiently grinding pulp in the process of heating the raw materials. The electricity consumption of the pulping equipment can reach below 250-280 DEG electricity per ton of pulp, and the electricity saving rate is more than 95%.
High-efficiency water saving: the pulping equipment provided by the invention adopts a water circulation system, the water consumption can be below 0.6-0.7 t/ton pulp, the water saving rate can be above 95%, the problems of difficult wastewater treatment and the like due to larger water consumption in the production process of the original pulping technology are solved, the new equipment can supply water according to the required water consumption, the zero discharge of industrial water is realized, the water circulation recycling and the replenishment of a pulp extruder are realized, and the energy is saved and the environment is protected;
high efficiency and environmental protection: the whole set of production equipment has no pollution, no chemical agent or additive, the circulating water is infinitely recycled in the pulping process, and the raw material impurities removed by iron removal are used for raising earthworms, so that a high-efficiency recycling system is formed.
2. In the pulping process, in order to achieve the processes of treating lignin and stripping fibers and breaking the adhesion force of lignin in pulping raw materials, the invention can effectively replace the effect of chemical pulping to dissolve lignin by combining high-temperature filament splitting and crushing of a extruding and splitting thread rolling machine under a closed system and high Wen Roumo of a pulping machine with the heat preservation effect of inclined spiral conveying; meanwhile, the raw materials are put into a closed system to be operated and rubbed at high speed, so that the materials are torn, crushed, broomed and swelled in an instant high-temperature state, and high-quality slurry is obtained.
3. The prior pulping equipment and technology produce black liquor in the production process by high-temperature and high-pressure cooking matched with auxiliary agents, and have high treatment cost. In the deironing device, not only the first section deironing can remove the impurities containing iron, but also the second section deironing has finer sorting function, and can remove the impurities containing iron such as fine particles, thereby avoiding the hidden trouble of black liquor caused by the front-end treatment of raw materials, being environment-friendly and greatly reducing the cost, and meanwhile, the slurry has better appearance, can completely show the natural color of the raw materials, and has no phenomena of darkness and turbidity.
4. The diversity selection of raw materials: the pulping equipment is not only suitable for pulping wheat straw, rice straw and reed raw materials, but also suitable for pulping waste wood chips, and the pulping technology can effectively process the raw materials comprising straw fibers, wood fibers and other different fiber structures by adopting the same equipment and technology and the same power consumption and water consumption, simultaneously prepares the slurry with the same quality and obviously and effectively reduces the cost of the raw materials due to the unique high-temperature wire separation effect of the extruding-splitting wire-rolling machine and the heat preservation effect of the high Wen Roumo and oblique spiral conveying of the pulping machine.
5. The application is wide, the material performance is enhanced, and the cost is effectively reduced: the slurry product prepared by the equipment provided by the invention can be widely applied to corrugated paper, work bags, plates, tableware and the like.
Drawings
The invention will be further described with reference to the accompanying drawings and specific examples,
fig. 1 is a flow chart showing the construction of the pulp production apparatus of the present invention.
Detailed Description
Example 1
Referring to fig. 1, a pulp production device comprises a pulping system, a circulating water system, a clean water pipeline system and a steam pipeline system, wherein the circulating water system, the clean water pipeline system and the steam pipeline system are respectively connected with the pulping system through pipelines, and the pulp production device comprises a pulp storage device, a pulp storage device and a pulp storage device, wherein the pulp storage device is a pulp storage device
The pulping system comprises a crushing device, a quantitative unit, a belt conveying device, an iron removing device, an inclined spiral conveying device, a quantitative unit, a vertical spiral conveying device, a crack squeezing thread rolling machine, a multi-section pulping device, a pulp squeezing machine and a belt conveying device which are sequentially arranged;
the multi-section pulping device comprises a first-section inclined spiral conveying device, a steam heating device, a first-section pulping machine, a second-section inclined spiral conveying device, a second-section pulping machine, a third-section inclined spiral conveying device, a third-section pulping machine, a fourth-section inclined spiral conveying device and a fourth-section pulping machine which are connected in sequence, wherein the fourth-section pulping machine is connected with the pulp extruding machine;
the circulating water system comprises a water return tank and a circulating water pipeline, and the circulating water pipeline is respectively connected to the inclined spiral conveying device, the first-section inclined spiral conveying device and the second-section inclined spiral conveying device through the water return tank to form a circulating loop;
the clear water pipeline system is correspondingly connected to the inclined spiral conveying device, the first-section inclined spiral conveying device and the second-section inclined spiral conveying device through clear water pipelines and the circulating water system respectively;
the steam pipeline system is connected to the one-stage inclined spiral conveying device through a steam pipeline, so that the purpose of curing raw materials is achieved.
The pulping machine adopted by the multi-stage pulping device in the embodiment is an existing high-concentration pulping machine.
Specifically, the high-concentration pulping machine comprises a feeding system, a pulping system, an adjusting moving system and a transmission system which are sequentially arranged from left to right, wherein the feeding system comprises a feeding transmission body, a feeding port and a feeding spiral pipe which are sequentially connected, the pulping system comprises a fixed disc seat and a pulping chamber, the adjusting moving system comprises a micro-motion handle and a quick-motion handle, and the transmission system comprises a motor which is connected with the pulping system through a pin coupling, a main shaft and a bearing chamber.
The pulping chamber is a main working area of the pulping machine, a fixed stator disc abrasive disc and an axially movable rotor disc abrasive disc are arranged in the pulping chamber, the rotor disc abrasive disc is a multi-element nickel-cadmium alloy casting abrasive disc, and the stator disc abrasive disc is a silicon carbide composite abrasive disc. The cooperation of the two grinding sheets can ensure the pulping quality of the semi-chemical mechanical pulp, protect the fibers from being cut off in the fluffing process, and improve the fibrillation degree (bifurcation rate) of the single fibers.
A flushing pipe is arranged above the pulping chamber, a shaft sleeve and a sealing sleeve are arranged between the pulping chamber and the bearing chamber, and the pulping chamber is sealed by a spinning filler packing.
Example 2
A pulping process applied to the multistage pulping apparatus in example 1.
The pulping process specifically comprises the following steps:
and (3) pulping in one section: placing the raw materials subjected to the fibrillation in a section of inclined spiral conveying device, adding a dryness regulator into the raw materials to enable the dryness of the raw materials to reach 50-70%, conveying the raw materials to a section of pulping machine at the temperature of 50-90 ℃ in the conveying stage; the pulp is kneaded and ground by a primary pulp grinder, the pulp grinding temperature is 70-110 ℃, primary pulp with the beating degree of 21-24 DEG SR is obtained, and the wet weight of fiber is 3-11g;
two-stage pulping: feeding the first-stage pulping slurry into a second-stage inclined spiral conveying device, adding a dryness regulator to ensure that the dryness of the raw materials reaches 30-50%, and conveying the slurry to a second-stage pulping machine at the temperature of 80-110 ℃; the pulp is kneaded and ground by a two-stage pulp grinder, the pulp grinding temperature is 80-110 ℃, and the two-stage pulp with 24-28 DEG SR degree is obtained, and the wet weight of the fiber is 3-8g;
three-stage pulping: feeding the second-stage pulping slurry into a three-stage inclined spiral conveying device, and conveying the slurry to a three-stage pulping machine; the three-stage pulping machine is used for carrying out kneading and grinding on the pulp, the pulping temperature is 90-110 ℃, and three-stage pulping pulp with the pulping degree of 28-33 DEG SR is obtained, and the wet weight is 2-5g;
four-stage pulping: feeding the three-section pulping slurry into a four-section inclined spiral conveying device, and conveying the slurry to a four-section pulping machine; the four-stage pulping machine carries out fine grinding on the pulp, the pulping temperature is 90-110 ℃, and the four-stage pulping pulp with the pulping degree of 33-38 DEG SR is obtained, and the wet weight is 2-5g.
Example 3
A pulp preparation process applied to the pulp production apparatus in example 1.
The method specifically comprises the following steps:
(1) Crushing raw materials: the wheat straw is primarily crushed in a crushing device, the crushing speed is 3t/h, and the length of the crushed wheat straw is 2cm.
(2) Iron removal treatment: feeding the crushed raw materials in the step (1) into an iron removing device through a transmission device to perform iron removing treatment; the iron removal treatment is carried out in two stages, the crushed raw materials are firstly subjected to first-stage iron removal, the first-stage iron removal adopts a magnetic roller, iron-containing impurities such as scrap iron, iron nails and iron wires in the raw materials are adsorbed by contacting with the surface of the raw materials, then the two-stage iron removal is carried out, the second-stage iron removal adopts a known electric roller iron remover, the model DCQ400x800 is matched with a frequency converter to adjust the rotating speed, the iron-containing impurities in the raw materials are removed, and the cleanliness of the raw materials is further ensured; the ratio of the raw material treatment rate of the iron removal treatment step to the raw material crushing step is 1:3.
(3) And (3) yarn-separating and brooming: after iron removal treatment, adding a dryness regulator into a transmission device to regulate the dryness of the raw material to 70%, and then entering a yarn splitting and brooming device through the transmission device to perform yarn splitting and brooming, wherein the yarn splitting and brooming are performed in a closed system, and the temperature in the closed system is 65 ℃; the raw material treatment rate of the step of separating silk and the step of removing iron is the same; after being divided into filaments and broomed, the length of the raw material is lower than 1cm.
(4) Pulping: the pulping comprises four continuous operation units which are positioned in the same closed system, namely a primary pulping unit, a secondary pulping unit, a tertiary pulping unit and a quaternary pulping unit, wherein each operation unit consists of raw material transmission and raw material pulping stages, and the raw material transmission rate is the same as the wire-dividing fibrillation rate; the method comprises the following steps:
the first-stage, second-stage, third-stage and fourth-stage pulping equipment adopts a high-concentration pulping machine.
And (3) pulping in one section: after the raw materials are divided into filaments and broomed, the raw materials enter a first-stage inclined spiral conveying device, steam at 100 ℃ is introduced to cure the raw materials, the dryness of the raw materials reaches 60%, the temperature in the conveying stage is 65 ℃, and the pulp is conveyed to a first-stage pulp grinder; the pulp is kneaded and ground by a primary pulp grinder, the pulp grinding temperature is 85 ℃, the pulp grinding power is 160kw, and primary pulp with the beating degree of 21-24 DEG SR is obtained, and the wet weight of fiber is 5g;
two-stage pulping: feeding the primary pulping slurry into a secondary inclined spiral conveying device, wherein the dryness of the raw materials reaches 40%, the temperature in the conveying stage is 85 ℃, and conveying the slurry to a secondary pulping machine; the pulp is kneaded and ground by a two-stage pulp grinder, the pulp grinding temperature is 85 ℃, the pulp grinding power is 160kw, and the two-stage pulp with 24-28 DEG SR degree is obtained, and the wet weight of the fiber is 4g;
three-stage pulping: feeding the second-stage pulping slurry into a three-stage inclined spiral conveying device, wherein the dryness of the raw materials reaches 40%, the temperature in the conveying stage is 90 ℃, and conveying the slurry to a three-stage pulping machine; the three-stage pulping machine is used for carrying out kneading and grinding on the pulp, the pulping temperature is 90 ℃, the pulping power is 132kw, and the three-stage pulping pulp with the pulping degree of 28-33 DEG SR is obtained, and the wet weight is 3g;
four-stage pulping: feeding the three-stage pulping slurry into a four-stage inclined spiral conveying device, wherein the dryness of the raw materials reaches 15%, the temperature in the conveying stage is 95 ℃, and conveying the slurry to a four-stage pulping machine; the four-stage pulping machine carries out fine grinding on the pulp, the pulping temperature is 95 ℃, the pulping power is 132kw, and the four-stage pulping pulp with the pulping degree of 33-38 DEG SR is obtained, and the wet weight is 2g.
(5) Pulp extrusion: the raw materials are conveyed to a pulp extruding machine for pulp extrusion after pulp extrusion, the dryness of the finished pulp is controlled to be 20%, the finished pulp with the beating degree of 38 DEG SR is obtained, the wet weight is 2g, and the pulp yield is 95%; the clean water after pulp extrusion is recycled through the backflow of a circulating water pipeline;
in the pulping process, electricity consumption can reach 350 ℃ electricity per ton of pulp, and the electricity saving rate is 96%. The water consumption can reach 3 t/ton pulp, and the water saving rate can reach more than 96%. In the pulping process, no black liquor is generated, and zero discharge of wastewater is realized.
The foregoing describes the embodiments of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
It should also be understood that, although the present disclosure has been described in terms of examples, not every embodiment is described in terms of only a single embodiment, but rather, such description is for clarity only, and that the disclosure is not limited to only a single embodiment, as embodiments of the disclosure may be practiced otherwise than as specifically described herein.
Claims (7)
1. A pulp production facility characterized by: comprises a pulping system, a circulating water system, a clear water pipeline system and a steam pipeline system, wherein the circulating water system, the clear water pipeline system and the steam pipeline system are respectively connected with the pulping system through pipelines, and the water circulation system, the clear water pipeline system and the steam pipeline system are respectively connected with the pulping system through pipelines, wherein
The pulping system comprises a crushing device, a quantitative unit, a belt conveying device, a two-section iron removing device, an inclined spiral conveying device, a quantitative unit, a vertical spiral conveying device, a crack squeezing thread rolling machine, a multi-section pulping device, a pulp squeezing machine and a belt conveying device which are sequentially arranged;
the multi-section pulping device comprises a first-section inclined spiral conveying device, a steam heating device, a first-section pulping machine, a second-section inclined spiral conveying device, a second-section pulping machine, a third-section inclined spiral conveying device, a third-section pulping machine, a fourth-section inclined spiral conveying device and a fourth-section pulping machine which are connected in sequence, wherein the fourth-section pulping machine is connected with the pulp extruding machine;
the circulating water system comprises a water return tank and a circulating water pipeline, and the circulating water pipeline is respectively connected to the inclined spiral conveying device, the first-section inclined spiral conveying device and the second-section inclined spiral conveying device through the water return tank to form a circulating loop;
the clear water pipeline system is correspondingly connected to the inclined spiral conveying device, the first-stage inclined spiral conveying device and the second-stage inclined spiral conveying device through clear water pipelines and the circulating water system respectively;
the steam pipeline system is connected to a section of inclined spiral conveying device of the multistage pulping device through a steam pipeline.
2. A pulp production device as defined in claim 1, characterized in that: the pulping machine in the multi-stage pulping device is a high-concentration pulping machine.
3. A pulp production facility as claimed in claim 2, characterized in that: the high-concentration pulping machine comprises a feeding system, a pulping system, an adjusting moving system and a transmission system, wherein the feeding system comprises a feeding transmission body, a feeding port and a feeding spiral pipe which are sequentially connected, the pulping system comprises a fixed disc seat and a pulping chamber, the adjusting moving system comprises a micro-motion handle and a quick-motion handle, and the transmission system comprises a motor which is connected with the pulping system through a pin coupling, a main shaft and a bearing chamber.
4. A pulp production device as claimed in claim 3, characterized in that: a rotor disc abrasive disc capable of moving axially and a stator disc abrasive disc fixed are arranged in the pulping chamber, the rotor disc abrasive disc is a multi-element nickel-cadmium alloy casting abrasive disc, and the stator disc abrasive disc is a silicon carbide composite abrasive disc.
5. A pulp production device as claimed in claim 3, characterized in that: a flushing pipe is arranged above the pulping chamber, a shaft sleeve and a sealing sleeve are arranged between the pulping chamber and the bearing chamber, and the pulping chamber is sealed by a spinning fiber packing.
6. A pulping process characterized by: the process is applied to the multi-section pulping device of any one of claims 1 to 5, and specifically comprises the following steps:
step 1: one-stage pulping
Placing the raw materials subjected to the fibrillation in a section of inclined spiral conveying device, adding a dryness regulator into the raw materials to enable the dryness of the raw materials to reach 50-70%, conveying the raw materials to a section of pulping machine at the temperature of 50-90 ℃ in the conveying stage; the pulp is kneaded and ground by a primary pulp grinder, the pulp grinding temperature is 70-110 ℃, primary pulp with the beating degree of 21-24 DEG SR is obtained, and the wet weight of fiber is 3-11g;
step 2: two-stage pulping
Feeding the first-stage pulping slurry into a second-stage inclined spiral conveying device, adding a dryness regulator to ensure that the dryness of the raw materials reaches 30-50%, and conveying the slurry to a second-stage pulping machine at the temperature of 80-110 ℃; the pulp is kneaded and ground by a two-stage pulp grinder, the pulp grinding temperature is 80-110 ℃, and the two-stage pulp with 24-28 DEG SR degree is obtained, and the wet weight of the fiber is 3-8g;
step 3: three-stage pulping
Feeding the second-stage pulping slurry into a three-stage inclined spiral conveying device, and conveying the slurry to a three-stage pulping machine; the three-stage pulping machine is used for carrying out kneading and grinding on the pulp, the pulping temperature is 90-110 ℃, and three-stage pulping pulp with the pulping degree of 28-33 DEG SR is obtained, and the wet weight is 2-5g;
step 4: four-stage pulping
Feeding the three-section pulping slurry into a four-section inclined spiral conveying device, and conveying the slurry to a four-section pulping machine; the four-stage pulping machine carries out fine grinding on the pulp, the pulping temperature is 90-110 ℃, and the four-stage pulping pulp with the pulping degree of 33-38 DEG SR is obtained, and the wet weight is 2-5g.
7. A pulp production process, characterized in that: the process is applied to the pulp production device of any one of claims 1 to 5, and the pulp production process specifically comprises:
crushing the raw materials in the step (1):
primarily crushing wheat straw in a crushing device at a crushing rate of 2-4t/h, wherein the length of the primarily crushed wheat straw is 1-3cm;
and (2) iron removal treatment:
feeding the crushed raw materials in the step (1) into an iron removing device through a transmission device to perform iron removing treatment; the iron removal treatment is carried out in two stages, the crushed raw materials are firstly subjected to one-stage iron removal, iron-containing impurities such as scrap iron, iron nails, iron wires and the like in the raw materials are adsorbed by contacting with the surface of the raw materials, and then the iron-containing impurities in the raw materials are removed by two-stage iron removal, so that the cleanliness of the raw materials is further ensured; the ratio of the raw material treatment rate of the iron removal treatment step to the raw material crushing step is 1:3;
step (3) yarn splitting and fibrillation:
after iron removal treatment, adding a dryness regulator into a transmission device to regulate the dryness of the raw materials to 60-80%, and then entering a yarn splitting and brooming device through the transmission device to perform yarn splitting and brooming, wherein the yarn splitting and brooming are performed in a closed system, and the temperature in the closed system is 60-70 ℃; the raw material treatment rate of the step of separating silk and the step of removing iron is the same; after being divided into filaments and broomed, the length of the raw material is lower than 1cm;
pulping in the step (4):
the pulping comprises four continuous operation units which are positioned in the same closed system, namely a primary pulping unit, a secondary pulping unit, a tertiary pulping unit and a quaternary pulping unit, wherein each operation unit consists of raw material transmission and raw material pulping stages, and the raw material transmission rate is the same as the wire-dividing fibrillation rate;
the first-stage, second-stage, third-stage and fourth-stage pulping equipment adopts a high-concentration pulping machine;
and (3) pulping in one section: after the raw materials are divided into filaments and broomed, the raw materials enter a first-stage inclined spiral conveying device, steam at 100 ℃ is introduced to cure the raw materials, the dryness of the raw materials reaches 50-70%, the temperature in the conveying stage is 60-70 ℃, and the slurry is conveyed to a first-stage pulping machine; the pulp is kneaded and ground by a primary pulp grinder, the pulp grinding temperature is 80-90 ℃, the pulp grinding power is 160kw, and primary pulp with the beating degree of 21-24 SR is obtained, and the wet weight of fiber is 4-6g;
two-stage pulping: feeding the primary pulping slurry into a secondary inclined spiral conveying device, wherein the dryness of the raw materials reaches 30-50%, the temperature in the conveying stage is 80-90 ℃, and conveying the slurry to a secondary pulping machine; the pulp is kneaded and ground by a two-stage pulp grinder, the pulp grinding temperature is 80-90 ℃, the pulp grinding power is 160kw, and the two-stage pulp with 24-28 DEG SR degree is obtained, and the wet weight of the fiber is 3-5g;
three-stage pulping: feeding the second-stage pulping slurry into a three-stage inclined spiral conveying device, wherein the dryness of the raw materials reaches 30-50%, the temperature in the conveying stage is 85-95 ℃, and conveying the slurry to a three-stage pulping machine; the three-stage pulping machine is used for carrying out kneading and grinding on the pulp, the pulping temperature is 85-95 ℃, the pulping power is 132kw, and the three-stage pulping pulp with the pulping degree of 28-33 DEG SR is obtained, and the wet weight is 2-4g;
four-stage pulping: feeding the three-stage pulping slurry into a four-stage inclined spiral conveying device, wherein the dryness of the raw materials reaches 10-20%, the temperature in the conveying stage is 90-100 ℃, and conveying the slurry to a four-stage pulping machine; refining the slurry by a four-stage refiner, wherein the refining temperature is 90-100 ℃, the refining power is 132kw, and the four-stage pulping slurry with the beating degree of 33-38 DEG SR is obtained, and the wet weight is 1-3g;
step (5) pulp extrusion:
the raw materials are conveyed to a pulp extruding machine for pulp extrusion after pulp preparation, and a finished product is obtained after pulp extrusion.
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