CN104928966B - Drying technology for paper and paperboard - Google Patents
Drying technology for paper and paperboard Download PDFInfo
- Publication number
- CN104928966B CN104928966B CN201510362256.1A CN201510362256A CN104928966B CN 104928966 B CN104928966 B CN 104928966B CN 201510362256 A CN201510362256 A CN 201510362256A CN 104928966 B CN104928966 B CN 104928966B
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- China
- Prior art keywords
- water
- boiler
- high temperature
- superheated
- temperature tower
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Classifications
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
Abstract
The invention belongs to a drying technology for paper and a paperboard. Processed soft water is conveyed into a pressure-bearing hot water boiler through a boiler water pump, the water inside the boiler is heated to be superheated water at the temperature ranging from 155 to 165, the superheated water is conveyed to a high temperature tower through a pipeline, the superheated water inside the high temperature tower is conveyed into hot press boards of a hot press through a circulating pump, a warm paperboard slab with the water content ranging from 60% to 80% is sandwiched between the hot press boards, the heat of the superheated water is absorbed, the moisture of the warm paperboard slab is evaporated, and the warm paperboard slab is changed into a dried paperboard with the water content ranging from 4% to 6%; low-temperature water with the temperature ranging from 120 to 140 discharged from the hot press boards of the hot press is conveyed back to the lower portion of the high temperature tower, the water at the lower portion of the high temperature tower is conveyed to the pressure-bearing hot water boiler again through the boiler water pump, therefore, the boiler water is heated to be the superheated water with the temperature ranging from 155 to 165 again, the superheated water is conveyed into the high temperature tower again through the pipeline, and the water is circulated. According to the drying technology, the quality of products is good, the energy resources are saved, and the pollution is reduced.
Description
Technical field:
The present invention is applied to the drying process producing industrial paperboard, civilian cardboard and other paper, is a kind of paper and cardboard
Drying process.
Background technology:
Cardboard both domestic and external is dried and other products drying is mainly carried out using modes such as steam, conduction oil or electricity at present,
Using these methods, both affect the inherent quality of product, and such as cause product drying uneven；Affect the presentation quality of product, such as again
Superficial charring and deformation etc.；And high energy consumption, conduction oil drying mode also can pollute because of oil seepage, affects surrounding enviroment.
The purpose of the present invention is: makes the method that the water in boiler is directly changed superheated water by circulating line, indirect drying
L Water Paper base, obtains cardboard or paper product.
This technique can meet the demand of the paper that raw material is different, purposes is different and thickness is different and cardboard, can make full use of
Heat resource, optimizes l Water Paper base and dries flow process and product quality, substantially reduce the costs such as production fuel and power.
Content of the invention:
The purpose of the present invention is paper and cardboard to be dried using new-type drying meanss superheated water.The present invention is realized in
:
Water is processed through integrated apparatus 1 and reverse osmosis unit 2, then is delivered to pressure-bearing hot kettle with boiler water pump 5
In stove 6, in stove, water is heated to form 155 DEG C～165 DEG C of superheated water, and superheated water delivers to high temperature tower 7 by pipeline, in high temperature tower 7
Superheated water delivered in the heating platen of hot press 9 by circulating pump 8, accompany between heating platen water content be 60-80% wet paperboard
Base absorbs heat of vaporization moisture, becomes the dry cardboard that water content is 4～6%；From 120-140 DEG C out of hot press 9 heating platen
Superheated water returns to high temperature tower 7 bottom, and the water of bottom is delivered in bearing hot water boiler 6 by boiler water pump 5 again, such boiler water and quilt
It is heated into 155～165 DEG C of superheated waters；, again by pipeline to high temperature tower 7, the pressure of Constant pressure tank 4 is by pressurization by nitrogen gas, fixed for superheated water
The water that supplements on a small quantity of pressure tank 4 is completed by small pump 3, so circulates.
Advantages of the present invention:
1st, substantially it is not required to water treatment facilities and water process personnel, reduce investment, saved expense.
2nd, typically it is not required to blowdown, supplementary water is few, easy and simple to handle, substantially increases safety, alleviates the labor of operator
Fatigue resistance.
3rd, improve inherent quality and the presentation quality of cardboard, uniform drying is stable, the same plate of cardboard, different plate difference are little, cardboard
Uniform moisture is consistent, and calliper, shrinkage factor, tensile strength, dieletric strength reach iec standard.For cardboard and transformer oil
Fused during create good condition, intermiscibility is consistent, and oil absorbency is consistent, and it is high some point proof voltages never again,
Some put the low bad phenomenon of proof voltage.
4th, energy efficient, used hot water drying cardboard is than with steam, conduction oil, electric seasoning cardboard, energy consumption cost saving
30%.The dzl4.2-1.6/180/160-a ii type boiler that we use at present, compared with 4.2mw steam boiler, can save for 1 year
About 1,200,000 yuan of cost.
5th, water circulates in hermetic container, water-tight in cyclic process, does not emit vapour, does not have any pollution to surrounding,
Comply fully with environmental requirement.
Brief description: Fig. 1 is the process chart of the present invention
Icon illustrates: 1, integrated apparatus, 2, reverse osmosis unit, 3, small pump, 4, Constant pressure tank, 5, boiler water pump, 6, pot
Stove, 7, high temperature tower, 8, circulating pump, 9, hot press.
Specific embodiment:
Super extra-high voltage insulating board industrial water is by integrally disguising by water (river, mineral water, lake water or subsoil water)
Put 1 pretreatment, then pass through reverse osmosis unit 2, make hardness of water be less than 0.03m mol/l, electrical conductivity becomes 4～6 μ s/m；Hold
The industrial water that directly takes of soft water used by pressure hot-water heating system, with boiler water pump 5 deliver to special boiler 6 (bearing hot water boiler) and
In high temperature tower 7；Bearing hot water boiler 6 is more than 2.5mpa, furnace roof has peace with other steam boiler basic simlarity, its bearing pressure
Full valve and two automatic exhaust valves, but there is no liquidometer, bearing hot water boiler must full water run.General boiler all enters from top
Water, bearing hot water boiler 6 is as shown in figure 1, be from boiler tail water inlet, water inlet pipe all carries shower nozzle, fountain, nominal condition stream
Measure the water resistance≤0.07mpa passing through；Bearing hot water boiler 6 is furnished with Constant pressure tank 4, and the pressure of Constant pressure tank, by pressurization by nitrogen gas, works
There is high temperature tower 7 on ground, and when the water table ratio predetermined water level of Constant pressure tank 4 and high temperature tower 7 is low, the liquid level sensor on Constant pressure tank 4 transmits
Number give automatic water supplement pump 3 (flow 6m3/ h, lift 170m), water in Constant pressure tank 4, in Constant pressure tank 4 for small pump 3 automatic water supplement
Automatically feed boiler 6 again.The high 10-12 rice of high temperature tower 7, its top high 2-4 rice than boiler 6 top.High temperature tower 7 top is equipped with safety
Valve, exhaust-valve, when the steam pressure at its top is higher than to set pressure, relief valve automatically opens up, and steam is discharged in air；High temperature tower
7 upper side, as general boiler, equipped with magnetic double level gauge, also have liquid level sensor；Magnetic double level gauge opposite equipped with
Water level and the water temperature of high temperature tower 7 all can be observed at monitoring arrangement, boiler room and hot press；Bearing hot water boiler 6 is also common
Steam boiler, is also provided with blowoff valve, generally not blowdown, underload blowdown several times be all transparent clear water and
Vapour, has no mud thing；During work, the water of high temperature tower 7 lower floor is constantly delivered in boiler 6 by the boiler water pump 5 of boiler 6 configuration, pot
Water in stove 6 is sent to high temperature tower 7 top through pipeline after being heated, and (in same container, the high water of temperature is always in top, temperature
Spend slightly lower water always in bottom) boiler water pump 5 that configured by boiler 6 of the water of high temperature tower 7 bottom delivers to boiler 6 in and heats, so
Iterative cycles, the water in high temperature tower 7 becomes the superheated water (superheated water of the dry needs of insulating board that can meet production technology needs
Generally 150 DEG C～155 DEG C of temperature).And the overheated water-circulating pump 8 that the superheated water on high temperature tower 7 top is configured by high temperature tower 7 will
Superheated water is delivered in each layer heating platen of hot press 9, and heating platen absorbs the heat energy that temperature is 150 DEG C～160 DEG C of superheated waters, temperature
Slowly raise, the superheated water becoming 120-140 DEG C from heating platen water out is returned to high temperature tower 7 bottom, is configured by boiler 6
Water slightly lower for temperature is pumped to heating in boiler 6 by boiler water pump 5 again；So superheated water circulates repeatedly in closed unit, constantly
Heating platen is passed to heat in ground, and l Water Paper base one cage one cage between heating platen becomes certain dry cardboard (the insulating board water of water content
Point general control is 3%～6%), meet market demand.
Superheated water circulates in airtight container although temperature is higher (needs the superheated water one of our uses according to production
As at 150 DEG C～155 DEG C, pressure is in 0.7mpa), but outside at all invisible water and vapour leakage, so the amount of evaporating of water is non-
Chang Feichang is little, and one month or several months slightly mend some softened waters.
Same principle can be used for the drying of tissue paper.As long as equipment is made fraction of corresponding adjustment, superheated water is introduced
The cylinder dried system of paper machine can be used for the drying of tissue paper.
Claims (5)
1. surpass the drying process of extra-high voltage insulating board, water is located through integrated apparatus (1) and reverse osmosis unit (2)
Reason it is characterised in that: the soft water boiler water pump (5) after processing is delivered in bearing hot water boiler (6), in stove, water is heated to form
155-165 DEG C of superheated water, superheated water delivers to high temperature tower (7) by pipeline, and the superheated water in high temperature tower (7) is by circulating pump (8)
Deliver to the l Water Paper slab absorption heat of vaporization water accompanying water content 60-80% in the heating platen of hot press (9) between heating platen
Point, become the dry cardboard of water content 4-6%；The pressure of Constant pressure tank (4) by pressurization by nitrogen gas, Constant pressure tank (4) supplement on a small quantity water by
Small pump (3) completes；Return to high temperature tower (7) bottom, the water of bottom from the heating platen of hot press 120-140 DEG C of superheated water out
Delivered in bearing hot water boiler (6) by boiler water pump (5), such boiler water is heated to form 155-165 DEG C of superheated water again, overheated again
Water again by pipeline to high temperature tower (7), so circulation.
2. super extra-high voltage insulating board according to claim 1 drying process it is characterised in that: water is after treatment
Hardness is less than 0.03m mol/l, and electrical conductivity becomes 4～6 μ s/m.
3. super extra-high voltage insulating board according to claim 1 drying process it is characterised in that: the overheated homogeneous solution-type reactor of pressure-bearing
(6) intake from boiler tail, water inlet pipe all carries shower nozzle, water resistance≤0.07mpa that operating mode flow passes through；The overheated kettle of pressure-bearing
Stove (6) is furnished with Constant pressure tank (4), and there is high temperature tower (7) in place of working, when the water table ratio predetermined water level of Constant pressure tank (4) and high temperature tower (7) is low
When, the liquid level sensor on Constant pressure tank (4) signals to automatic water supplement pump (3), and the water in Constant pressure tank (4) feeds boiler more automatically
(6).
4. super extra-high voltage insulating board according to claim 1 drying process it is characterised in that: high temperature tower (7) top
The high 2-4 rice than boiler (6) top；High temperature tower (7) top is equipped with relief valve, exhaust-valve；High temperature tower (7) is equipped with magnetic turnover panel liquid level
Meter, also has liquid level sensor；Magnetic double level gauge opposite is equipped with monitoring arrangement.
5. super extra-high voltage insulating board according to claim 1 drying process it is characterised in that: superheated water introduce make
The cylinder dried system of paper machine, you can for the drying of tissue paper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510362256.1A CN104928966B (en) | 2015-06-17 | 2015-06-17 | Drying technology for paper and paperboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510362256.1A CN104928966B (en) | 2015-06-17 | 2015-06-17 | Drying technology for paper and paperboard |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104928966A CN104928966A (en) | 2015-09-23 |
| CN104928966B true CN104928966B (en) | 2017-02-01 |
Family
ID=54116375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510362256.1A Active CN104928966B (en) | 2015-06-17 | 2015-06-17 | Drying technology for paper and paperboard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104928966B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE515299C2 (en) * | 1999-11-18 | 2001-07-09 | Flaekt Ab | Procedure for drying paper |
| CA2549332A1 (en) * | 2005-06-30 | 2006-12-30 | Weyerhaeuser Company | Insulating paperboard |
| CN2874272Y (en) * | 2006-02-10 | 2007-02-28 | 谢少东 | Boiler water feeder |
| JP5392332B2 (en) * | 2011-09-15 | 2014-01-22 | 第一実業株式会社 | Drying equipment |
| CN103017484A (en) * | 2012-12-08 | 2013-04-03 | 中国林业科学研究院木材工业研究所 | Wood vacuum drying method and device |
-
2015
- 2015-06-17 CN CN201510362256.1A patent/CN104928966B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104928966A (en) | 2015-09-23 |
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