CN111501387A - Low steam consumption hot fiber grinding system - Google Patents
Low steam consumption hot fiber grinding system Download PDFInfo
- Publication number
- CN111501387A CN111501387A CN202010449161.4A CN202010449161A CN111501387A CN 111501387 A CN111501387 A CN 111501387A CN 202010449161 A CN202010449161 A CN 202010449161A CN 111501387 A CN111501387 A CN 111501387A
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- Prior art keywords
- grinding
- steam
- main
- pipeline
- grinding chamber
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- 238000000227 grinding Methods 0.000 title claims abstract description 135
- 239000000835 fiber Substances 0.000 title claims abstract description 24
- 238000003801 milling Methods 0.000 claims abstract description 12
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 238000004064 recycling Methods 0.000 claims abstract description 7
- 238000010411 cooking Methods 0.000 claims description 26
- 238000003756 stirring Methods 0.000 claims description 4
- 238000010792 warming Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 10
- 238000004537 pulping Methods 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 5
- 239000002023 wood Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- D21B1/26—Driving or feeding arrangements
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
The invention discloses a low-steam-consumption hot-milling fiber system. The grinding machine comprises a digester and a grinding main machine, and further comprises two main steam pipelines which are respectively connected with a digester cylinder of the digester and a grinding chamber of the grinding main machine, wherein a differential pressure pipeline with a differential pressure gauge is connected between the two main steam pipelines, the differential pressure pipeline is positioned between an inlet of the digester cylinder and an inlet of the grinding chamber, the pressure between the grinding chamber and the digester cylinder keeps balanced or the pressure of the grinding chamber is slightly larger than the pressure of the digester cylinder through detection of the differential pressure gauge, and a compressed air pipeline connected with the main steam pipeline is arranged at the inlet of the grinding chamber of the grinding main machine. The advantages are that: the demand of the system on steam is reduced, the operation cost is low, the investment is low, and the maintenance cost is low; steam generated in the fiber making process is directly recycled through a steam recycling pipeline, comprehensive utilization is achieved, energy is saved, the method is suitable for the condition that steam supply is insufficient when capacity is improved in original pulping, normal production is guaranteed, and steam is utilized to the maximum extent.
Description
Technical Field
The invention relates to a hot-grinding fiber system, in particular to a low-steam-consumption hot-grinding fiber system.
Background
A hot grinding fibre-making system is a continuous separation equipment for separating plant raw material into fibres under the condition of a certain steam pressure, and is characterized by that before grinding, the raw material is heated and softened in a digester 102 by using saturated steam with a certain pressure and temperature, the softened wood chips are fed into the space between grinding discs on the surface of moving and static grinding discs of grinding chamber by means of feeder 107 in the front of grinding chamber, the moving disc loaded with grinding discs is rotated with main shaft at high speed, the fixed disc loaded with grinding discs is fastened in the inner side of grinding chamber shell body, the wood chips are subjected to high-frequency external forces of compression, tension, torsion, impact, friction and the like under the action of tooth forms of two grinding discs, and ground into fibres or fibre bundles, the separated fibres and steam are discharged from grinding chamber together, in the fibre discharge process, mainly depending on steam, in the existent technology the steam source is divided into two portions, one portion is under the action of mechanical work in the grinding process, the moisture in the raw material is heated and quickly vaporized to be converted into steam; the other part is the steam flowing from the digester due to the flowing of the raw material and the pressure difference, wherein most (more than 40 percent) of the steam is discharged along with the fiber, so that the consumption of the steam is large, and the operation cost of the equipment is increased.
Disclosure of Invention
The invention aims to provide a low-steam-consumption thermal-grinding fiber system capable of reducing steam consumption in thermal-grinding pulping.
In order to solve the technical problem, the low-steam-consumption hot-milling fiber system comprises a digester for heating and softening raw materials, a grinding main machine for grinding the softened raw materials, and two main steam pipelines respectively connected with a cooking cylinder of the digester and a grinding chamber of the grinding main machine, wherein a differential pressure pipeline with a differential pressure gauge is connected between an inlet of the cooking cylinder and an inlet of the grinding chamber, the pressure between the grinding chamber and the cooking cylinder is kept balanced or the pressure of the grinding chamber is slightly larger than the pressure of the cooking cylinder through the detection of the differential pressure gauge, and a compressed air pipeline which is connected with the main steam pipeline and can introduce compressed air into the grinding chamber is arranged at the inlet of the grinding chamber of the grinding main machine.
A steam recycling pipeline is arranged between the cooking cylinder of the cooker and the grinding chamber of the grinding main machine.
The grinding main machine is provided with a belt type screw feeder, and a cooking cylinder of the cooker is connected with the belt type screw feeder through a stirring and conveying system.
And valves are arranged on the two main steam pipelines, the steam recycling pipeline and the compressed air pipeline.
And pressure detection devices are arranged on the two main steam pipelines and the compressed air pipeline.
The grinding chamber is internally provided with a fixed grinding disc, a movable grinding disc which can be driven by a main shaft to rotate, a fixed grinding disc arranged on the fixed grinding disc and a movable grinding disc arranged on the movable grinding disc, and a gap between the fixed grinding disc and the movable grinding disc is gradually reduced from inside to outside until the steam and the compressed air can be isolated.
The fixed grinding sheet and the movable grinding sheet are sequentially provided with a crushing area, a coarse grinding area and a fine grinding area from inside to outside.
The fixed grinding sheet and the movable grinding sheet are both provided with a zigzag tooth-shaped structure.
The invention has the advantages that:
1. compressed air is introduced into the grinding chamber (the pressure of the compressed air is slightly greater than the pressure in the grinding chamber), and the ground fibers are discharged out of the grinding chamber by utilizing the compressed air to replace steam, so that the demand of the system on the steam is reduced, the operation cost is low, the investment is low, and the maintenance cost is low;
2. the air source of the compressed air is clean, no pollution is caused, and the steam generated in the fiber making process is directly recycled through the steam recycling pipeline, so that the comprehensive utilization is realized, and the energy is saved.
3. The method is suitable for the condition that the steam supply is insufficient when the productivity is improved in the original pulping process, and the normal production is ensured.
4. The grinding disc structure on the grinding disc is changed, so that when raw materials are ground, an area with zero steam speed is formed outside a grinding area of the grinding disc, steam and compressed air are isolated, the steam generated in the grinding process flows to a grinding center and enters a digester through a balance pipe on the side face of the belt type spiral feeder to heat the raw materials, and the steam is utilized to the maximum extent.
Drawings
FIG. 1 is a schematic diagram of a system for thermally grinding fibers with low steam consumption in accordance with the present invention;
FIG. 2 is a schematic view of the structure of the polishing chamber of the present invention;
FIG. 3 is a schematic view of the surface structure of a refiner plate according to the invention;
FIG. 4 is a schematic diagram of a specific volume curve according to the present invention.
Detailed Description
The low steam consumption thermal milling fiber system of the present invention will be described in further detail with reference to the accompanying drawings and the following detailed description.
As shown in the figure, the low-steam consumption hot-milling fiber system comprises a digester 102 for heating and softening raw materials, a grinding main machine 105 for grinding the softened raw materials, a wood plug screw feeder 111 arranged at the front part of the digester 102, a belt screw feeder 107 arranged on the grinding main machine 105, a stirring and conveying system 108 arranged between a cooking cylinder of the digester 102 and the belt screw feeder 107, the cooking cylinder of the digester 102 connected with the belt screw feeder 107 through the stirring and conveying system 108, and two main steam pipelines 101 respectively connected with the cooking cylinder of the digester 102 and a grinding chamber of the grinding main machine 105, wherein as shown in the figure, the steam input ends of the two main steam pipelines 101 can be connected with a total main steam pipeline, wherein one main steam pipeline 101 is connected with the cooking cylinder of the digester 102 as a first conveying pipeline, the other main steam pipeline 101 is connected with the grinding chamber of the grinding main machine 105 to be used as a second conveying pipeline, a pressure difference pipeline 104 between the inlet of the cooking cylinder and the inlet of the grinding chamber is connected between the first conveying pipeline and the second conveying pipeline, a pressure difference meter 106 is arranged on the pressure difference pipeline 104, the pressure between the grinding chamber and the cooking cylinder is kept balanced or slightly greater than the pressure of the cooking cylinder through the detection of a differential pressure gauge, a compressed air pipeline 103 which is connected with a second conveying pipeline and can introduce compressed air into the grinding chamber is arranged at the inlet of the grinding chamber of the grinding main machine 105, a steam recycling pipeline 109 is arranged between the cooking cylinder of the cooking machine 102 and the belt type screw feeder 107, valves are arranged on the first conveying pipeline, the second conveying pipeline and the compressed air pipeline 103, and pressure detection devices are arranged on the two main steam pipelines 101 and the compressed air pipeline 103.
Furthermore, the grinding chamber is internally provided with a fixed grinding disc 201, a movable grinding disc 202 which can be driven by the main shaft to rotate, a fixed grinding disc 203 and a movable grinding disc 204 which are arranged on the fixed grinding disc, the fixed grinding disc 203 and the movable grinding disc 204 are sequentially provided with a crushing area 205, a rough grinding area 206 and a fine grinding area 207 from inside to outside, the fixed grinding disc 203 and the movable grinding disc 204 are both provided with a zigzag tooth-shaped structure, as can be seen from fig. 4, the flow direction of steam is shown between the fixed grinding disc 203 and the movable grinding disc 204 through an arrow, the flow direction of the steam is shown by the arrow at the upper part, the flow direction of the steam is shown by the arrow at the lower part, as can be seen from a corresponding specific volume curve diagram, the radius distance of the grinding discs is shown by the upper and lower direction in the diagram, the horizontal direction in the diagram shows.
The principle is as follows:
1. adding compressed air on a second conveying pipeline introduced into the grinding chamber, preheating the equipment through the second conveying pipeline when the equipment just starts to operate, gradually establishing the pressure of the grinding chamber, gradually closing a valve of the second conveying pipeline entering the grinding chamber when normal pulping starts, simultaneously gradually opening the valve of the compressed air, installing pressure detection on the pipelines introduced with steam and the compressed air, automatically adjusting the opening degree of the valve of the compressed air according to the pressure of a cooking cylinder, keeping the pressure of the compressed air to be always greater than or equal to the pressure of a digester and ensuring that the steam in the digester does not pass through a grinding area of a grinding disc; meanwhile, a differential pressure gauge 106 is arranged on a pipeline between the digester and the grinding chamber, the pressure between the grinding chamber and the cooking cylinder is kept balanced or the pressure of the grinding chamber is slightly larger than that of the cooking cylinder through the detection of the differential pressure gauge, so that steam generated in the grinding process does not penetrate through the grinding area to enter the grinding chamber under the action of pressure difference, and the using amount of the steam is reduced.
2. Through the structural design of the grinding plate, when the raw material is ground, an area with zero steam speed is formed outside a grinding area of the grinding plate, steam is isolated from compressed air, the steam generated in the grinding process flows to a grinding center and enters a digester through a steam recycling pipeline 109 on the side surface of the belt type spiral feeder to heat the raw material, and the steam is utilized to the maximum extent.
Claims (8)
1. A low steam consumption hot milling fiber system, comprising a digester (102) for warming and softening the feedstock and a main grinding mill (105) for grinding the softened feedstock, characterized in that: the grinding machine is characterized by further comprising two main steam pipelines (101) which are respectively connected with a cooking cylinder of the cooking device (102) and a grinding chamber of the grinding main machine (105), wherein a differential pressure pipeline (104) with a differential pressure gauge (106) is connected between the inlet of the cooking cylinder and the inlet of the grinding chamber between the two main steam pipelines (101), the pressure between the grinding chamber and the cooking cylinder is kept balanced or the pressure of the grinding chamber is slightly larger than the pressure of the cooking cylinder through the detection of the differential pressure gauge, and a compressed air pipeline (103) which is connected with the main steam pipeline (101) and can introduce compressed air into the grinding chamber is arranged at the inlet of the grinding chamber of the grinding main machine (105).
2. The low steam consuming thermal milling fiber system as set forth in claim 1, wherein: a steam recycling pipeline (109) is arranged between the cooking cylinder of the cooking device (102) and the grinding chamber of the grinding main machine (105).
3. A low steam consuming thermal milling fiber system as set forth in claim 1 or 2, wherein: the grinding main machine (105) is provided with a belt type screw feeder (107), and a cooking cylinder of the cooker (102) is connected with the belt type screw feeder (107) through a stirring and conveying system (108).
4. A low steam consuming thermal milling fiber system as set forth in claim 3, wherein: valves are arranged on the two main steam pipelines (101) and the compressed air pipeline (103).
5. A low steam consuming thermal milling fiber system as defined in claim 1, 2 or 4, wherein: and pressure detection devices are arranged on the two main steam pipelines (101) and the compressed air pipeline (103).
6. The low steam consuming thermal milling fiber system as set forth in claim 5, wherein: the grinding chamber is internally provided with a fixed grinding disc (201), a movable grinding disc (202) which can be driven by a main shaft to rotate, a fixed grinding disc (203) arranged on the fixed grinding disc and a movable grinding disc (204) arranged on the movable grinding disc, and a gap between the fixed grinding disc (203) and the movable grinding disc (204) tends to be smaller from inside to outside until steam and compressed air can be isolated.
7. The low steam consuming thermal milling fiber system of claim 6, wherein: the fixed grinding plate (203) and the movable grinding plate (204) are sequentially provided with a crushing area (205), a rough grinding area (206) and a fine grinding area (207) from inside to outside.
8. A low steam consuming thermal milling fiber system as set forth in claim 6 or 7, wherein: the fixed grinding plate (203) and the movable grinding plate (204) are both provided with a zigzag tooth-shaped structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010449161.4A CN111501387A (en) | 2020-05-25 | 2020-05-25 | Low steam consumption hot fiber grinding system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010449161.4A CN111501387A (en) | 2020-05-25 | 2020-05-25 | Low steam consumption hot fiber grinding system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111501387A true CN111501387A (en) | 2020-08-07 |
Family
ID=71875414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010449161.4A Pending CN111501387A (en) | 2020-05-25 | 2020-05-25 | Low steam consumption hot fiber grinding system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111501387A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112372782A (en) * | 2020-11-13 | 2021-02-19 | 新沂市大自然木业有限公司 | Protective medium-density fiberboard defibrator and working method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4235665A (en) * | 1976-06-30 | 1980-11-25 | American Defibrator, Inc. | Method and apparatus for producing fiber pulp in a steam pressurized grinding system |
| CN1974920A (en) * | 2006-12-12 | 2007-06-06 | 上海人造板机器厂有限公司 | Automatic steam control system of defibrator |
| CN101324035A (en) * | 2007-05-31 | 2008-12-17 | 安德里兹有限公司 | Grinding sheet having steam channel and method for extracting countercurrent flow steam from disc fine grinder |
| CN102356194A (en) * | 2009-03-17 | 2012-02-15 | 美卓造纸机械公司 | Method, system and refiner for refining of wood chips or pulp fibers |
| CN213328443U (en) * | 2020-05-25 | 2021-06-01 | 镇江中福马机械有限公司 | Low steam consumption hot fiber grinding system |
-
2020
- 2020-05-25 CN CN202010449161.4A patent/CN111501387A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4235665A (en) * | 1976-06-30 | 1980-11-25 | American Defibrator, Inc. | Method and apparatus for producing fiber pulp in a steam pressurized grinding system |
| CN1974920A (en) * | 2006-12-12 | 2007-06-06 | 上海人造板机器厂有限公司 | Automatic steam control system of defibrator |
| CN101324035A (en) * | 2007-05-31 | 2008-12-17 | 安德里兹有限公司 | Grinding sheet having steam channel and method for extracting countercurrent flow steam from disc fine grinder |
| CN102356194A (en) * | 2009-03-17 | 2012-02-15 | 美卓造纸机械公司 | Method, system and refiner for refining of wood chips or pulp fibers |
| CN213328443U (en) * | 2020-05-25 | 2021-06-01 | 镇江中福马机械有限公司 | Low steam consumption hot fiber grinding system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112372782A (en) * | 2020-11-13 | 2021-02-19 | 新沂市大自然木业有限公司 | Protective medium-density fiberboard defibrator and working method thereof |
| CN112372782B (en) * | 2020-11-13 | 2022-03-18 | 新沂市大自然木业有限公司 | Protective medium-density fiberboard defibrator and working method thereof |
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