NO801000L - INSTALLATIONS FOR AA SEPARATE DISSOLUTED WOOD SUBSTANCES DURING FIBER PLATES - Google Patents
INSTALLATIONS FOR AA SEPARATE DISSOLUTED WOOD SUBSTANCES DURING FIBER PLATESInfo
- Publication number
- NO801000L NO801000L NO801000A NO801000A NO801000L NO 801000 L NO801000 L NO 801000L NO 801000 A NO801000 A NO 801000A NO 801000 A NO801000 A NO 801000A NO 801000 L NO801000 L NO 801000L
- Authority
- NO
- Norway
- Prior art keywords
- water
- defibrator
- cyclone
- evaporation
- fiber mass
- Prior art date
Links
- 239000002023 wood Substances 0.000 title claims description 17
- 239000000126 substance Substances 0.000 title claims description 13
- 239000000835 fiber Substances 0.000 title claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 37
- 238000000034 method Methods 0.000 claims description 23
- 238000001704 evaporation Methods 0.000 claims description 15
- 230000008020 evaporation Effects 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000011094 fiberboard Substances 0.000 claims description 7
- 238000002386 leaching Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 229920002522 Wood fibre Polymers 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 239000002025 wood fiber Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- HSOLPAFROQCEQW-UHFFFAOYSA-N Antibiotic SEK 15 Natural products Cc1cc(O)cc(O)c1C(=O)c2c(O)cc(O)cc2CC3=CC(=O)C=C(O)O3 HSOLPAFROQCEQW-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
-
- 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
-
- 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
- D21C11/00—Regeneration of pulp liquors or effluent waste waters
- D21C11/0021—Introduction of various effluents, e.g. waste waters, into the pulping, recovery and regeneration cycle (closed-cycle)
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Description
Den foreliggende oppfinnelse angår et system til på et tidlig stadium av fremstillingen av trefiberplater å skille oppløste vedsubstanser fra prosessvann for å kunne nyttig-gjøre seg dem økonomisk og unngå problemer med kvaliteten av sluttproduktet - trefiberplaten - i form av overflatedefekter samt, ikke minst av betydning for miljøvernhensyn, å skaffe et akseptabelt avløpsvann for direkte utslipp. The present invention relates to a system for separating dissolved wood substances from process water at an early stage of the production of wood fiber boards in order to make economic use of them and avoid problems with the quality of the end product - the wood fiber board - in the form of surface defects as well as, not least of importance for environmental protection reasons, to provide an acceptable waste water for direct discharge.
Ved konvensjonell produksjon av fiberplater skjer fri-leggning av trefibere ved våtprosessen ved at treflis og/eller spon forvarmes og deretter i en defibrator bearbeides med to roterende maleskiver. Maleoperasjonen kan skje i eller flere trinn, hvorav det siste kalles raffinørtrinn. Forvar-mingen skjer i en særskilt forvarmer ved direkte innblåsning av vanndamp, vanligvis lavere enn 10 ato og 200°C. Under forvarming og maling oppløses vedsubstansene, som siden følger med prosessvannet frem til arkformingen og den endelige pressning av fiberplaten da væskefasen avgår i form av damp og væske. In the conventional production of fibreboard, wood fibers are released during the wet process by preheating wood chips and/or shavings and then processing them in a defibrator with two rotating grinding discs. The grinding operation can take place in one or more stages, the last of which is called the refiner stage. The pre-heating takes place in a special pre-heater by direct blowing in of steam, usually lower than 10 ato and 200°C. During preheating and painting, the wood substances are dissolved, which then accompany the process water until the sheet forming and the final pressing of the fiberboard, when the liquid phase leaves in the form of steam and liquid.
Prosessvannet blir deretter behandlet for rensning innen der skjer utslipp fra fabrikken. En vanlig rensemetode i den forbindelse består i å behandle prosessvannet i en såkalt "luftedam" for senkning av BS7~innholdet. For en fabrikk av gjennomsnittlig størrelse utgjør investeringen for en luftedam omtrent 15 millioner svenske kroner og en årlig omkostning på ca. 4 millioner kroner - en investering med følgende om-kostninger som ikke har noe motstykke i økonomisk gevinst. The process water is then treated for purification before it is discharged from the factory. A common cleaning method in this regard consists of treating the process water in a so-called "air pond" to lower the BS7~ content. For a factory of average size, the investment for an air dam amounts to approximately SEK 15 million and an annual cost of approx. NOK 4 million - an investment with the following overheads which has no counterpart in financial gain.
For å minske vannvolumene har endel fabrikker sluttede vannsystemer for resirkulering av vannet, hvorved ny tilført masse anriker prosessvannet på BS-^. En ulempe ved disse systemer er at der melder seg problemer med hensyn til kvaliteten av det endelige produkt i form av overflatedefekter for-årsaket av tilsmussing av presseplatene ved den avsluttende ferdigpressing. Videre blir ømfintlige.deler i produksjons-linjen utsatt for betydelige korrosjonsproblemer. In order to reduce water volumes, some factories have closed water systems for recycling the water, whereby newly added mass enriches the process water with BS-^. A disadvantage of these systems is that problems arise with regard to the quality of the final product in the form of surface defects caused by soiling of the press plates during the final final pressing. Furthermore, sensitive parts in the production line are exposed to significant corrosion problems.
Med systemet ifølge den foreliggende oppfinnelse tarWith the system according to the present invention takes
man vare på en større del av vannet allerede etter oppløsnin-gen og utlutningen av vedsubstansene fra den malte fibermasse a larger part of the water is retained already after the dissolution and leaching of the wood substances from the ground fiber mass
.ved pressning til minst 60% tørrhetsgrad. De stoffer som .by pressing to at least 60% dryness. The substances which
ble oppløst ved den hydrolyserende maling, blir skilt fra pressevannet ved inndampning av dette. En del av pressevannet kan med fordel innføres i defibratoren på ny og anrikes på oppløste vedsubstanser. was dissolved by the hydrolysing paint, is separated from the press water by evaporation of this. Part of the press water can be advantageously reintroduced into the defibrator and enriched with dissolved wood substances.
Systemet ifølge oppfinnelsen til fraskillelse av oppløste vedsubstanser fra prosessvann ved produksjon av fiberplater innbefatter i rekkefølge forvarmer, defibrator, syklon, utlutningsinnretning og avvanningsinnretning for den oppmalte fibermasse, og erkarakterisert vedat prosessvannet fra avvanningsinnretningen ledes tilbake dels til defibratoren og dels til et i systemet innføyet inndampningsapparat, hvorfra produsert vanndamp ledes til forvarmeren, det hele slik at der dannes et sluttet system for sirkulerende vann, omfattende to kretser. The system according to the invention for separating dissolved wood substances from process water during the production of fiberboards includes, in order, a preheater, defibrator, cyclone, leaching device and dewatering device for the ground fiber mass, and is characterized by the fact that the process water from the dewatering device is led back partly to the defibrator and partly to an evaporation device inserted in the system , from which produced water vapor is led to the preheater, all so that a closed system for circulating water is formed, comprising two circuits.
Ved at.overskuddsdamp fra syklonen ledes til inndampningsinnretningen for å utnyttes energimessig i denne, blir der tilføyet det sluttede vannsirkulasjonssystem enda en tredje krets. When excess steam from the cyclone is led to the evaporation device to be utilized in terms of energy in this, a third circuit is added to the closed water circulation system.
Systemet ifølge oppfinnelsen kan enklest anskueliggjøres ved henvisning til tegningen, som er et prinsippskjema. Her betegner henvisningstallene The system according to the invention can be easily visualized by reference to the drawing, which is a schematic diagram. Here the reference numbers denote
1. Forvarmer1. Preheater
2. Defibrator2. Defibrator
3. Syklon3. Cyclone
4. Utlutningsinnretning4. Leaching device
5. Avvanningsinnretning (presse)5. Dewatering device (press)
6. Inndampningsinnretning6. Evaporation device
7. Massebinge7. Mass binge
Treflis og/eller spon blir ved hjelp av skruemater inn-matet i forvarmeren 1, hvori der innblåses damp direkte, og blir etter forbehandling her ført videre til defibratoren 2, hvor selve nedmalingsprosessen til fibermasse foregår. Denne føres videre til syklonen 3, deretter til utlutningsinnretnin-gen 4 og avvanningsinnretningen 5, hensiktsmessig en skrupresse, samt sluttelig til bingen 7. Fra bingen 7 går fibermassen videre for å bearbeides blant annet i en raffinør og ledes så til en arkformningsmaskin og formpresse, hvor den ferdige-fiberplate fremstilles. Disse senere produksjonstrinn er dog Wood chips and/or shavings are fed into the preheater 1 with the help of a screw feeder, where steam is blown directly into it, and after pretreatment here are taken on to the defibrator 2, where the grinding process itself into fiber pulp takes place. This is carried on to the cyclone 3, then to the leaching device 4 and the dewatering device 5, suitably a screw press, and finally to the bin 7. From the bin 7, the fiber mass goes on to be processed, among other things, in a refiner and is then led to a sheet forming machine and forming press, where the finished fibreboard is produced. However, these later production steps are
ikke tatt med på tegningen.not included in the drawing.
Pressevannet fra 5 blir etter omstendighetene fordelt mellom defibratoren 2 og inndampningsinnretningen 3. Fra 6 ledes produsert vanndamp til forvarmeren 1. Syklonen 3 er forbundet med inndampningsinnretningen 6, som dens overskuddsdamp kan ledes til for å utnyttes energimessig. The compressed water from 5 is, depending on the circumstances, distributed between the defibrator 2 and the evaporation device 3. From 6, produced water vapor is directed to the preheater 1. The cyclone 3 is connected to the evaporation device 6, to which its excess steam can be directed to be utilized in terms of energy.
Systemet ifølge oppfinnelsen medfører en rekke fordeler. The system according to the invention entails a number of advantages.
Samlet utslipp av forurensninger i prosessvannet blir lavt ved at blir konsentrert i det vann som allerede fra-skilles i skruepressen etter defibratoren og så føres til inndampningsapparatet. The overall emission of pollutants in the process water is low by being concentrated in the water that is already separated in the screw press after the defibrator and then fed to the evaporation apparatus.
Det er mulig å minske ekstra tilsetning av vann i defibratoren ved å la vann fra skrupressen føres tilbake til defibratoren. Mengden av tilbakeført vann bestemmes av konsen-trasjonen av oppløste vedsubstanser, og denne bestemmes i sin tur av vannets damptrykk og temperatur samt av vedens type. It is possible to reduce the extra addition of water in the defibrator by allowing water from the screw press to be fed back to the defibrator. The amount of returned water is determined by the concentration of dissolved wood substances, and this is determined in turn by the water's vapor pressure and temperature as well as by the type of wood.
Prosessutbyttet blir påvirket i positiv retning, siden defibratoren blir matet med vann som allerede inneholder opp-løste vedsubstanser. I reaksjonen The process yield is affected in a positive direction, since the defibrator is fed with water that already contains dissolved wood substances. In the reaction
ved (i defibratoren) >fiber + oppløste vedsubstanser hemmes oppløsning av ved, noe som girøket utbytte av mengde fibrer/mengde ved. Systemet er gunstig i økonomisk henseende, da den mengde vann som inneholder hovedparten av stoffer oppløst og suspendert i prosessen, bare utgjør noen hundrede-ler av den totale mengde av prosessvann. En ytterligere an-rikning ved inndampning blir derfor økonomisk interessant. Den fremkomne rest fra inndampningen kan anvendes enten som brensel eller avsettes som kreaturfdr. wood (in the defibrator) >fibre + dissolved wood substances, the dissolution of wood is inhibited, which increases the yield of amount of fibres/amount of wood. The system is advantageous from an economic point of view, as the amount of water that contains the majority of substances dissolved and suspended in the process only makes up a few hundredths of the total amount of process water. A further enrichment by evaporation therefore becomes economically interesting. The resulting residue from the evaporation can be used either as fuel or deposited as animal feed.
Overskuddsvarme fra syklonen kan nyttiggjøres for inndampning/ og overskuddsvarme fra inndampningsinnretningen kan i sin tur brukes til forvarmning av råmaterialer eller av prosessvann. Excess heat from the cyclone can be used for evaporation/ and excess heat from the evaporation device can in turn be used for preheating raw materials or process water.
Prosessens økonomi blir også ytterligere forbedret ved at den etterfølgende raffinering kan utføres ved optimalt tørr-stoffinnhold, noe som er gunstig med hensyn til energiforbru-ket. The economy of the process is also further improved by the fact that the subsequent refining can be carried out at an optimal dry matter content, which is favorable with regard to energy consumption.
Ved å skille oppløste vedsubstanser fra prosessvannet på et tidlig stadium av prosessen skaffer man et relativt rent vann i de senere faser av prosessen, noe som bidrar til bedre produktkvalitet ved varmpressningen av ferdige plater. By separating dissolved wood substances from the process water at an early stage of the process, relatively clean water is obtained in the later phases of the process, which contributes to better product quality during the hot pressing of finished boards.
En viktig forutsetning for at systemet skal gi ønsket resultat, er at pressen etter defibratoren skal gi et tørr-stoffinnhold for fibermassen høyere enn det som vil foreligge senere når den.sluttelige presse- og inndampningsfase til ferdig fiberplate påbegynnes i varmpressen. An important prerequisite for the system to produce the desired result is that the press after the defibrator must produce a dry matter content for the fiber mass higher than that which will be present later when the final pressing and evaporation phase to the finished fiberboard begins in the hot press.
De følgende eksempler anskueliggjør tallmessig systemets miljøvernende funksjon: The following examples illustrate numerically the system's environmental protection function:
Eksempel 1Example 1
Produksjon av 400 tonn fiberplate ved benyttet system ifølge oppfinnelsen. Production of 400 tonnes of fiberboard using the system according to the invention.
Fibermassens tørrstoffinnhold etter skrupressen 60%. The dry matter content of the fiber mass after the screw press 60%.
Sluttelig prosessvann for utslipp i ekstern resipient inneholder ca. 6,5 kg BS^/tonn fiberplate. Final process water for discharge in an external recipient contains approx. 6.5 kg BS^/tonne fibreboard.
Tilsvarende utslipp uten anvendelse av systemet ifølge oppfinnelsen blir 27 kg BS^/tonn. Corresponding emissions without the use of the system according to the invention are 27 kg BS^/tonne.
Eksempel 2Example 2
Produksjon av 365 tonn hård fiberplate og 35 tonn byg-ningsplate ved anvendelse av systemet ifølge oppfinnelsen. Production of 365 tonnes of hard fiber board and 35 tonnes of building board using the system according to the invention.
Fibermassens tørrstoffinnhold etter skrupressen 60%. The dry matter content of the fiber mass after the screw press 60%.
Sluttelig prosessvann for utslipp i ekstern resipient inneholder ca. 7 kg BS^/tbnn plate. Final process water for discharge in an external recipient contains approx. 7 kg BS^/tbnn plate.
Tilsvarende utslipp uten anvendelse av systemet ifølge oppfinnelsen blir ca. 30 kg BS^/tonn. Corresponding emissions without the use of the system according to the invention will be approx. 30 kg BS^/ton.
Claims (4)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7903177A SE417847B (en) | 1979-04-10 | 1979-04-10 | PROCEDURE FOR SEPARATION OF DISSOLVED SUBSTANCES FROM THE PROCESSING WATER IN THE MANUFACTURE OF FIBER DISC |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO801000L true NO801000L (en) | 1980-10-13 |
Family
ID=20337781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO801000A NO801000L (en) | 1979-04-10 | 1980-04-08 | INSTALLATIONS FOR AA SEPARATE DISSOLUTED WOOD SUBSTANCES DURING FIBER PLATES |
Country Status (5)
| Country | Link |
|---|---|
| CA (1) | CA1140382A (en) |
| FI (1) | FI801098A (en) |
| FR (1) | FR2453935B1 (en) |
| NO (1) | NO801000L (en) |
| SE (1) | SE417847B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4668341A (en) * | 1984-10-29 | 1987-05-26 | Kamyr Ab | Method and apparatus for producing mechanical pulp with a steam turbine driven refiner |
| US4692214A (en) * | 1984-10-29 | 1987-09-08 | Kamyr Ab | Apparatus for producing mechanical pulp with a refiner having its drive shaft connected to a steam turbine output shaft |
| US5053108A (en) * | 1989-06-28 | 1991-10-01 | Kamyr Ab | High sulfidity cook for paper pulp using black liquor sulfonization of steamed chips |
-
1979
- 1979-04-10 SE SE7903177A patent/SE417847B/en unknown
-
1980
- 1980-04-08 NO NO801000A patent/NO801000L/en unknown
- 1980-04-08 FI FI801098A patent/FI801098A/en not_active Application Discontinuation
- 1980-04-08 CA CA000349325A patent/CA1140382A/en not_active Expired
- 1980-04-10 FR FR8008042A patent/FR2453935B1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FI801098A (en) | 1980-10-11 |
| SE7903177L (en) | 1980-10-11 |
| CA1140382A (en) | 1983-02-01 |
| SE417847B (en) | 1981-04-13 |
| FR2453935B1 (en) | 1986-02-21 |
| FR2453935A1 (en) | 1980-11-07 |
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