EP0570385A1 - Method for supplying pressurized continuous digesters to obtain cellulose pulp. - Google Patents
Method for supplying pressurized continuous digesters to obtain cellulose pulp.Info
- Publication number
- EP0570385A1 EP0570385A1 EP92901780A EP92901780A EP0570385A1 EP 0570385 A1 EP0570385 A1 EP 0570385A1 EP 92901780 A EP92901780 A EP 92901780A EP 92901780 A EP92901780 A EP 92901780A EP 0570385 A1 EP0570385 A1 EP 0570385A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cooker
- pressure
- valve
- pump
- plug
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- D21C1/00—Pretreatment of the finely-divided materials before digesting
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C7/00—Digesters
- D21C7/06—Feeding devices
Definitions
- the present invention relates to a process for the preparation of cellulosic pastes by cooking lignocellulosic materials, such as wood chips or annual plants, in a continuous pressure cooking reactor and more particularly to a process for supply to said reactor.
- the feeding systems currently used are for the most part of the following types, a - For annual plants: Continuous screws with variable or frustoconical pitch, fitted at the end with a back-pressure system.
- the system makes it possible to prevent the material from being discharged by the vapor pressure prevailing inside the cooker, generally of the order of 7 bars.
- These screws have drawbacks, namely rapid wear due to the presence of silica in the plants used (bagasse, kenaf, straw, hemp, etc.), which necessitates a frequent change of screws which must be recharged with metal and, for certain plants (in particular wet straw), a difficulty in ensuring a regular flow because the material tends to rotate with the screw and no longer.
- the systems used are of the airlock or rotary valve type. These devices operate in the following cycle. 1. A certain quantity of chips is introduced into a volume at atmospheric pressure.
- the volume is closed and subjected to a vapor pressure equal to that of the cooker.
- the volume is opened towards the cooker and the chips are poured there.
- the volume is then ready to receive a new chip load.
- Such systems have drawbacks because they are discontinuous and consequently disturb the operation of the cooker and cause a pressure drop at each cycle.
- the proposed system can be used both for annual plants and for wood chips. It is particularly well suited to continuous processes and in particular to the two-step process, as described in the French utility certificate n ° 2542 021 (see also European patent n ° 0 136 325 and American patent n ° 4 790 905).
- the continuous cooker feeding process for obtaining cellulosic pulp according to the present invention is characterized in that one introduces into a piston pump with an open cylinder head which re ⁇ flows in a piping connected to the cooker of ignocellulosic materials. 'such as wood shavings or annual plants, impregnated beforehand with chemical reagents in a quantity just necessary for their cooking and with water in sufficient quantity to obtain a pasty but non-liquid consistency.
- the seal of the cooker is ensured by a plug of material impregnated in the supply piping, which therefore does not include a valve or a sealing valve.
- the impregnation at the heart of the lignocellulose material is ensured in two phases: a) mixing of the impregnation liquor and the lignocellulose materials in proportions necessary for cooking by conventional agitation, and b) subjecting this mixture during introduction into the cooker to a high pressure, preferably of the order of 80 bars, by pressure using the piston pump with open cylinder head, which forces the penetration of the impregnation liquor at the heart of the lignocellulosic material.
- the first step of the process is impregnation, for example described in the aforementioned patents.
- the annual plant is torn to pieces of 5 to 10 cm, for example. Then it is added with hot water and alkaline or alkaline earth reagents necessary for cooking to obtain the desired quality of dough.
- these are immersed hot in a solution of alkaline or alkaline-earth reagents of a given concentration for a time sufficient to absorb in the co ⁇ skin the quantity of reagents necessary for its cooking. Then the skins are drained.
- a liquor impregnation / dry matter ratio (LI / MS) preferably equal to or close to 1.5, which can also vary according to the nature of the raw material used from 0.8 to 3.
- the second phase of the process includes injection.
- the impregnated material is injected under pressure by the open cylinder head piston pump 2 into the piping 3 connected to the cooker 1 provided with a double jacket heated by means of steam.
- the piston pump can be a double body, each piston working alternately so as to create an almost continuous or single-body flow.
- the piping 3 between the outlet of the pump and the inlet of the cooking reactor must be of a length and diameter such that the pressure drop created, thanks to the formation of a plug 4 resulting from the compression action of the pump piston, greater than the internal pressure of the reactor.
- the length of the pipe 3 and its diameter can be 3 to 3 m and 200 to 300 mm respectively.
- this flange is bolted tightly and the temperature of the cooker is adjusted to 170 ° C. by vapor pressure at 7 bars.
- the piping connecting the pump to the cooker does not have any valve or valve.
- the plug of compressed material in the supply tube is perfectly sealed.
- Example 2 The procedure is as in the previous example, using uncut barley straw in the form of 30 kg bales.
- bales of straw i.e. 300 kg soda powder 40 kg anhydrous soda ash powder 12 kg hot water spray 470 kg
- the product obtained is homogeneous and has the appearance of a wet straw.
- the impregnated straw is introduced into the cooker whose pressure is 7 bars, the duration of the introduction being
- Example 3 280 kg of ABL SALIGNA Eucalyptus 12 shavings at 92% dryness, placed in a stainless steel basket perforated with holes, are immersed in a sodium hydroxide solution containing 102.4 g / l of NaOH at 100 ° C for 30 minutes. * The chips 2.5 mm thick and 2 cm long are then removed from the solution and drained for 5 minutes. The weight of chips after impregnation is 580 kg. Using the same equipment as before, these chips are pushed into the experimental cooker whose internal pressure is 7 bars and the temperature of 170 ° C. The tube connecting the outlet of the pump to the inlet of the cooker has a length of 6 m and a diameter of 200 mm.
Abstract
L'invention concerne un système d'alimentation en copeaux de bois ou plantes annuelles de cuiseurs continus destinés à la production de pâtes à papier. Le système comporte deux étapes: une première étape d'imprégnation où les copeaux sont imprégnés de la quantité de réactifs chimiques nécessaires à leur cuisson par imprégnation à chaud dans des solutions alcalines ou alcalino-terreuses, puis égouttés. S'il s'agit de plantes annuelles, celles-ci sont mélangées mécaniquement avec des réactifs alcalins et/ou alcalino-terreux et avec un minimum d'eau chaude pour obtenir un mélange à l'aspect de fibres humides. Une deuxième étape où le produit imprégné ci-dessus est pompé directement dans un cuiseur (1) sous pression par une pompe à piston hydraulique (2), le bouchon (4) formé dans la tuyauterie (3) reliant cette pompe au cuiseur réalisant l'étanchéité et la résistance à la pression nécessaire.The invention relates to a system for feeding wood chips or annual plants to continuous cookers for the production of paper pulp. The system has two stages: a first impregnation stage where the chips are impregnated with the quantity of chemical reagents necessary for their cooking by hot impregnation in alkaline or alkaline-earth solutions, then drained. In the case of annual plants, they are mechanically mixed with alkaline and / or alkaline earth reagents and with a minimum of hot water to obtain a mixture with the appearance of wet fibers. A second step where the above impregnated product is pumped directly into a cooker (1) under pressure by a hydraulic piston pump (2), the plug (4) formed in the pipe (3) connecting this pump to the cooker carrying out the sealing and pressure resistance required.
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9015759A FR2670512A1 (en) | 1990-12-17 | 1990-12-17 | System for feeding annual plants or wood chips to a continuous cooking reactor under pressure, intended for the production of cellulose pulp |
FR9015759 | 1990-12-17 | ||
PCT/FR1991/000986 WO1992011409A1 (en) | 1990-12-17 | 1991-12-09 | Method for supplying pressurized continuous digesters to obtain cellulose pulp |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0570385A1 true EP0570385A1 (en) | 1993-11-24 |
EP0570385B1 EP0570385B1 (en) | 1996-04-17 |
Family
ID=9403304
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92901780A Expired - Lifetime EP0570385B1 (en) | 1990-12-17 | 1991-12-09 | Method for supplying pressurized continuous digesters to obtain cellulose pulp |
Country Status (9)
Country | Link |
---|---|
US (1) | US5478439A (en) |
EP (1) | EP0570385B1 (en) |
CN (1) | CN1064117A (en) |
AU (1) | AU9128291A (en) |
CA (1) | CA2098493A1 (en) |
DE (1) | DE69118919T2 (en) |
ES (1) | ES2089490T3 (en) |
FR (1) | FR2670512A1 (en) |
WO (1) | WO1992011409A1 (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6106668A (en) * | 1996-10-25 | 2000-08-22 | Ahlstrom Machinery Inc. | Method for feeding comminuted fibrous material |
US5753075A (en) * | 1996-10-25 | 1998-05-19 | Stromberg; C. Bertil | Method and system for feeding comminuted fibrous material |
CA2363158A1 (en) * | 1999-03-02 | 2000-09-08 | Marc J. Sabourin | Feed preconditioning for chemical pulping |
FI120547B (en) * | 2004-10-04 | 2009-11-30 | Metso Paper Inc | Alkaline cooking process and pulp making plant |
US7815741B2 (en) | 2006-11-03 | 2010-10-19 | Olson David A | Reactor pump for catalyzed hydrolytic splitting of cellulose |
US7815876B2 (en) | 2006-11-03 | 2010-10-19 | Olson David A | Reactor pump for catalyzed hydrolytic splitting of cellulose |
SE530744C2 (en) * | 2007-02-23 | 2008-09-02 | Metso Fiber Karlstad Ab | Steam phase boilers and a procedure for continuous boiling |
SE532060C2 (en) * | 2008-03-20 | 2009-10-13 | Metso Fiber Karlstad Ab | Supply system including parallel pumps for a continuous boiler |
MX2011006888A (en) * | 2009-01-13 | 2011-09-06 | Biogasol Ipr Aps | Method and apparatus for in-feeding of matter to a process reactor. |
TWI392544B (en) * | 2010-06-17 | 2013-04-11 | Atomic Energy Council | A piston pressure feeding mechanism of lignocellulosic biomass |
US10393106B2 (en) * | 2014-12-15 | 2019-08-27 | Sustainable Waste Power Systems, Inc. | Pumps, pump assemblies, and methods of pumping fluids |
US20190194867A1 (en) * | 2016-05-27 | 2019-06-27 | Valmet Ab | Double alkali charging for chip impregnation |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2975096A (en) * | 1957-11-18 | 1961-03-14 | Bauer Bros Co | Impregnation of wood chips |
US3041233A (en) * | 1957-12-17 | 1962-06-26 | Kamyr Ab | Method of introducing high density pulp into a pressure vessel |
FR2542021B3 (en) * | 1983-03-02 | 1985-11-08 | Nivelleau Bruniere Patrick M F | PROCESS FOR TREATING WOOD OR OTHER LIGNOCELLULOSIC MATERIAL FOR OBTAINING CELLULOSIC PULP - PAPER OR CARDBOARD - CHEMICALS |
WO1984003527A1 (en) * | 1983-03-02 | 1984-09-13 | Nivelleau Bruniere Patrick M F | Method for treating lignocellulose materials to obtain cellulose |
SE461280B (en) * | 1988-06-06 | 1990-01-29 | Kamyr Ab | TREATMENT OF A FIBER-CONTAINING MATERIAL FOR COOKING TO MASS |
-
1990
- 1990-12-17 FR FR9015759A patent/FR2670512A1/en active Pending
-
1991
- 1991-12-09 WO PCT/FR1991/000986 patent/WO1992011409A1/en active IP Right Grant
- 1991-12-09 EP EP92901780A patent/EP0570385B1/en not_active Expired - Lifetime
- 1991-12-09 CA CA002098493A patent/CA2098493A1/en not_active Abandoned
- 1991-12-09 DE DE69118919T patent/DE69118919T2/en not_active Expired - Fee Related
- 1991-12-09 ES ES92901780T patent/ES2089490T3/en not_active Expired - Lifetime
- 1991-12-09 AU AU91282/91A patent/AU9128291A/en not_active Abandoned
- 1991-12-16 CN CN91112745A patent/CN1064117A/en active Pending
-
1993
- 1993-07-20 US US08/075,476 patent/US5478439A/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9211409A1 * |
Also Published As
Publication number | Publication date |
---|---|
CA2098493A1 (en) | 1992-06-18 |
WO1992011409A1 (en) | 1992-07-09 |
DE69118919T2 (en) | 1996-11-28 |
ES2089490T3 (en) | 1996-10-01 |
CN1064117A (en) | 1992-09-02 |
DE69118919D1 (en) | 1996-05-23 |
EP0570385B1 (en) | 1996-04-17 |
AU9128291A (en) | 1992-07-22 |
US5478439A (en) | 1995-12-26 |
FR2670512A1 (en) | 1992-06-19 |
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