US3401085A - Method of treating stored wood chips - Google Patents

Method of treating stored wood chips Download PDF

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Publication number
US3401085A
US3401085A US471985A US47198565A US3401085A US 3401085 A US3401085 A US 3401085A US 471985 A US471985 A US 471985A US 47198565 A US47198565 A US 47198565A US 3401085 A US3401085 A US 3401085A
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United States
Prior art keywords
pile
chips
chip
temperature
wood chips
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Expired - Lifetime
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US471985A
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English (en)
Inventor
Croon Ingemar Liss-Albin
Kjellander Lars Gunnar
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DOMSJO
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DOMSJO
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    • 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
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/005—Treatment of cellulose-containing material with microorganisms or enzymes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S162/00—Paper making and fiber liberation
    • Y10S162/12—Seasoning

Definitions

  • a sufficient portion of the chip pile is heated to a temperature of from about 1 to about 30 C. in order to initiate the enzymatic hydrolysis of resins in the wood chips and a substantially uniform temperature rise in the entire chip pile is permitted to occur.
  • the present invention relates to a method of storing wood chips.
  • the wood can be stored as chips in chip piles. Such storage is used for various reasons in different types of factories.
  • a sulfate pulp factory may use chip storage as a rational and inexpensive method of handling its wood, while a sulfite pulp factory also can utilize chip storage to improve the quality of the wood raw material.
  • the chips are transported to the chip pile by means of a pneumatic conveyor system.
  • the built pile is allowed to remain until the temperature rise sets in, which time can vary depending on the method of building the pile, the chip grade, the atmospheric temperature and other factors.
  • the chips may be cooled during transport to the pile to temperatures around or below 0 C. If there are great quantities of cooled chips in the built chip pile, the exothermic processes will occur so slowly that no temperature rise will set in until after several months, when the atmospheric temperature has again increased to well above 0 C.
  • the present invention aims at solving the problem of obtaining a uniform raise in temperature in a chip pile even when the pile is built in periods of low atmospheric temperatures. It was unexpectedly found that if during the buildup of the pile or a suitable time thereafter a suitable amount of heat is supplied to the chip pile at one or more times, the natural storage process can be initiated and carried through in a very short time: independently of the climatic conditions, and chips of very uniform quality be obtained.
  • the method of this invention comprises the step of causing a local temperature rise to occur in the lower portion of the chip pile, during the first half of the period of storage, so that within the treated zone the chips achieve a temperature of at least 1 C. and at most 30 C., whereby a uniform temperature rise is initiated in the chip pile and the above mentioned advantages are obtained.
  • the amount of heat to be supplied in any particular case depends on the temperature of the chips. It was found that as long as the chip material in the Zone of local heating has a temperature of 0 C., or lower, no exothermic enzymatic hydrolysis can start, while if one imparts to the chips a temperature of 1 C. or higher, such hydrolysis is initiated, which surprisingly enough rapidly results in a uniform temperature rise in the entire chip pile. In practice, it was found unnecessary and uneconomical to carry the local heating of the chips to above 30 C., and in most cases a temperature rise to between 1 C. and 15 C. will be sulficient. Especially advantageous results, from the point of view of heat economy, are in most cases obtained from a temperature rise of between 1 C. and 50 C., and it may in certain cases be more advantageous to carry out several heatings to this lower temperature at suitable intervals rather than a single heating to a higher temperature, e.g., if the local heating is carried out while the chip pile is being built.
  • the local heating should suitably be carried out in the lower half of the chip pile, since the warm vapors resulting from the exothermic reaction ascend through the pile, thereby spreading the exothermic reaction to the upper portions of the pile.
  • the heat is also dissipated from the zone of local heating to other zones of the pile by radiation and conduction, wherefore good results will also be obtained if the local heating is applied to other portions of the chip pile.
  • the atmospheric temperature is low and a particularly rapid initiation of the enzymatic hydrolysis is desired, it will be advantageous to supply heat at one or more times while building the pile.
  • FIGURE 1 shows a suitable device for supplying heat in top plan view
  • FIGURE 2 shows a cross-section along line II in FIGURE 1;
  • FIGURES 3 and 4 and FIGURES 5 and 6 illustrate two other embodiments of a heat supplying device, in views similar to FIGURES 1 and 2;
  • FIGURE 7 is a graph illustrating the effect of the method of this invention.
  • the local supply of heat can be achieved in various ways, such as by means of hot air, steam or electrical heating elements or the like.
  • heating by means of steam or hot air is to be preferred in view of the reduced danger of local overheating (hot spots) and because these heating media are usually readily available at the site where the pile is built.
  • a suitable device for heating in this manner is shown in FIGURES 1 and 2 and comprises a circular coil 1 with a pipe cross 2.
  • the heating medium enters through the inlet 3 and flows out through apertures 4, which in the cross are arranged for vertical blowing and in the circular coil for blowing at an angle of 45 to the horizontal, as illustrated in FIG- URE 2.
  • a device of this type can also be provided with vertical end pipes for horizontal blowing toward the center, which end pipes may be foldable or detachable, as illustrated in FIGURE 4.
  • a simple embodiment of the heating device comprises only a pipe cross and is shown in FIGURES and 6. It is of course also possible to let the blowing through the apertures 4 take place horizontally, as shown in FIGURES 3, 4, 5 and 6.
  • FIGURE 7 shows examples of the temperature process in the pile, (a) in one end of the pile where no heat was supplied (the upper graph) and (b) in the opposite end of the same chip pile (the middle graph), where heat was supplied locally to the pile by blowing in steam by means of the device shown in FIGURE 1, which was positioned when the outermost portion of the pile was being built. Steam of 100 C.
  • the lower graph in FIGURE 7 shows the atmospheric temperature at the site of the pile for comparison.
  • a method of treating resiniferous wood chips which are at a temperature of 0 C. or below and which are stored in a pile for pulping, in order to enhance the enzymatic hydrolysis of resins in the wood chips so that the resins will be more readily extracted in the pulping which comprises heating a sufficient portion of the chip pile to a temperature within the range from about 1 to about 30 C. in order to initiate the enzymatic hydrolysis of resins in the wood chips and permitting the temperature to rise substantially uniformly throughout the chip pile.

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • Microbiology (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
US471985A 1964-07-16 1965-07-14 Method of treating stored wood chips Expired - Lifetime US3401085A (en)

Applications Claiming Priority (1)

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SE871764 1964-07-16

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US3401085A true US3401085A (en) 1968-09-10

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US471985A Expired - Lifetime US3401085A (en) 1964-07-16 1965-07-14 Method of treating stored wood chips

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US (1) US3401085A (enrdf_load_stackoverflow)
FI (1) FI45997C (enrdf_load_stackoverflow)
NO (1) NO121371B (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3486969A (en) * 1965-07-20 1969-12-30 Mo Och Domsjoe Ab Process for the treating of wood chips with fungi to enhance enzymatic hydrolysis of the resinous components
US4088529A (en) * 1974-12-10 1978-05-09 Billeruds Aktiebolag Method of resin seasoning wood chips
US4289579A (en) * 1977-12-12 1981-09-15 Forsberg G L K Method for treating a bulk material with a fluid
US4521517A (en) * 1983-04-25 1985-06-04 Gauthier, Alvarado & Associates, Inc. Compost aeration system
US5476790A (en) * 1993-03-19 1995-12-19 Sandoz Ltd. Pitch degradation with white rot fungi
US5705383A (en) * 1993-03-19 1998-01-06 Clariant Finance (Bvi) Limited Pitch and lignin degradation with white rot fungi
US5853537A (en) * 1989-02-13 1998-12-29 Clariant Finance (Bvi) Limited Process for treating pulpwoods and pulps with a pitch degrading fungus of the genus Ophiostoma

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2617202A (en) * 1949-08-15 1952-11-11 Earl L Reedy Process of curing and treating lumber

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2617202A (en) * 1949-08-15 1952-11-11 Earl L Reedy Process of curing and treating lumber

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3486969A (en) * 1965-07-20 1969-12-30 Mo Och Domsjoe Ab Process for the treating of wood chips with fungi to enhance enzymatic hydrolysis of the resinous components
US4088529A (en) * 1974-12-10 1978-05-09 Billeruds Aktiebolag Method of resin seasoning wood chips
US4289579A (en) * 1977-12-12 1981-09-15 Forsberg G L K Method for treating a bulk material with a fluid
US4521517A (en) * 1983-04-25 1985-06-04 Gauthier, Alvarado & Associates, Inc. Compost aeration system
US5853537A (en) * 1989-02-13 1998-12-29 Clariant Finance (Bvi) Limited Process for treating pulpwoods and pulps with a pitch degrading fungus of the genus Ophiostoma
US5476790A (en) * 1993-03-19 1995-12-19 Sandoz Ltd. Pitch degradation with white rot fungi
US5705383A (en) * 1993-03-19 1998-01-06 Clariant Finance (Bvi) Limited Pitch and lignin degradation with white rot fungi

Also Published As

Publication number Publication date
NO121371B (enrdf_load_stackoverflow) 1971-02-15
FI45997C (fi) 1972-11-10
FI45997B (enrdf_load_stackoverflow) 1972-07-31

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