US1914073A - Method for the digestion of materials containing cellulose - Google Patents

Method for the digestion of materials containing cellulose Download PDF

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Publication number
US1914073A
US1914073A US590671A US59067132A US1914073A US 1914073 A US1914073 A US 1914073A US 590671 A US590671 A US 590671A US 59067132 A US59067132 A US 59067132A US 1914073 A US1914073 A US 1914073A
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Prior art keywords
strainer
digester
liquor
pipe
openings
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Expired - Lifetime
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US590671A
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English (en)
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Brobeck Arnold
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Individual
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Individual
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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
    • D21C7/00—Digesters

Definitions

  • the inventor has previously invented improved methods of producing cellulose by means of direct or indirect heating of the digesting liquor. by the circulation method.
  • Fig. 1 shows the digester with its preheater and pipelines, constructed according to the present invention.
  • Figs. 2, '3, 4 and 5 show details of the strainer on a larger scale.
  • Fig. 6 shows a modified form of construction of the strainer and Figs. 7 and 8 show details.
  • the digester 21 is fitted at the lower end of its cylindrical part with r a strainer 22, through which the liquor is sucked by the pump 24 through the pipe 23 and is passed through the pipe 25, which goes out from the pressure side of the pump, to-the preheater 26, where it is preferably heated indirectly. From thelatter, reheated liquoris carried by the pipe 27 into the upper end of the digester.
  • part of the liquor which is to be introduced into the lower end of the digester is now taken from the pipe 25 on the pressure side of the pump through pipe 28 and is forced through the latter into the lower end of the digester without having passed through the preheater 26.
  • the liquor is cooled to some extend while it passes through them, so that it is introduced into the lower end of the digester with a somewhat lower temperature than it has when it leaves the strainer.
  • the form of construction of the strainer through which the liquor is sucked out is of importance since it must be constructed in such a manner that the liquor is sucked out as uniformly as possible all the wayround the inner circumference of the digester.
  • the efi'ective straining area must be many times greater than the area of the out-suck pipe in order that a sufficient quantity of liqnor can be sucked out through the straining area when the fibres have been set free when digestion has taken place for some time. WVith the forms of strainer which have been usedup to the present this relatively large effective straining area has had as a result that at the beginning of the digestion, before the woodchips have been broken up, suction has only occurred through the parts of the strainer nearest the out-suck'pipe and it is only when the fibres have been successively set free that the suction has gradually extended to the entire straining area. V
  • the combined area of the above-mentioned openings should amount to between 1 and 2. This means therefore that the total area of the holes in question must not be less than the area of the out-suck pipe and should not be more than double the area of the outsuck pipe.
  • FIG. 2 is a horizontal section of part of a pulp digester with its strainer.
  • Fig. 3 shows on a larger scale a cross-section through the strainer along the line AB in Fig. 2.
  • Fig. 4 shows a longitudinal section along the line CD in Fig. 3.
  • Fig. 5 shows the same in perspective.
  • the steel-plate mantle of the digester is indicated by 1 and the lining by 2.
  • the strainer which forms the object of the present invention is placed round the inside of the digester lining and at the lower part thereof.
  • the strainer consists of two parts X and Y in order to permit of expansion and contraction, the two parts joining on to the out-suck pipe Z.
  • the strainer consists of two straining elements, an outer one 3, which is provided with a large number of small holes, and an inner one 4, which is provided with a small number of larger openings 5.
  • the strainer elements are built up from a number of strainer plates provided with angle flanges, which run across the strainer and are riveted to each other.
  • the flanges on the plates in the upper strainer element are indicated by 6 and 7 and those in the lower strainer element by 8 and 9.
  • a plate 10 is attached to the digester lining and forms the bottom of the channel 11 in the ring-shaped strainer. At one point in its length the channel joins on to the out-suck pipe Z.
  • the flanges 8 and 9 on the plates forming the inner strainer element support the lower side of the outer strainer element 3 and divide the space between the strainer elements into a number of separate spaces.
  • the flanges serve further to give the strainer elements stability.
  • the flanges 6, 7 8, are however not essential and the plates may overlap each other and be riveted together or they may be placed edge to edge without fastening.
  • the liquor is first sucked in through the openings in the outer strainer element and enters the spaces 13, from which it proceeds through the openings 5 into the channel 11 and from there to the out-suck pipe. It is a suitable arrangement to make the openings 5 of increasing size the farther they lie from the out-suck pipe, so that the largest openings are farthest from the out-suck pipe. In this manner the quantity of liquor sucked out through each of the openings per unit of time will be practically the same in spite. of the varying pressures.
  • the sucking out of the liquor takes place uniformly along the entire inner circumference of the digester.
  • the sucking out need not necessarily take place along the entire circumference but may also take place at a number of points thereon which are equidistant or practically equidistant from each other.
  • Fig. 6 shows arr example of a strainer in which the sucking out takes place in the manner last described.
  • the fi ure shows a horizontal section of a pulp digester taken just above the strainer.
  • the plate mantle of the digester is indicated here also by 1 and the lining by 2.
  • a pipe 30 is fitted round the inner circumference of the digester, the ends of the pipe being at ca little distance from each other for purposes of expansion and contraction.
  • a number of perforated suction pipes 31 are joined at regular intervals to the pipe 30 on both sides of the out-suck pipe 32 which leads from the pipe 30.
  • the pipes 31 extend down wards towards the bottom 33 of the digester along the tapering lower part of the same.
  • the pipes 31 may either be all of the same length or they may be alternately longer or shorter as is "shown by dotted lines.
  • Fig. 7 shows a vertical section of a part of the digester, illustrating how the pipes 31 are fitted.
  • a flange 35 in which is fitted a disc 34.
  • this disc there is an opening 36 corresponding to the openings 5 shown in Figs. 3 and 4.
  • the size of the openings 5 applies also to the openings 36, i. e. that the total area of the openings should be in the proportion [;:l to the areaof the out-suck pipe 32.
  • the discs 34 thus form the above mentioned secondary straining elements.
  • I claim: o Method of digesting materials contaning cellulose with positive circulation of the liquor through the'digester and through a heating apparatus and by sucking out the liquor through a strainer, located in the primary strainer element provided with a H great number of relatively small perforations strainer elements provided with a small number of relatively large openings distributed at equal distances from one another, said openings communicating with a common chitnnel, and an out-suck tube from said channe on its surface and one or several secondary 3.
  • Strainer for effecting a uniform suck- 3 ing out of digesting liquor from cellulose digesters, comprising a primary strainer element provided with a greater number of relatively small perforations, a secondary strainer element provided with a small number of relatively large openings distributed at equal distances from one another, said openings communicating with a common channel, and an out-suck tube from said channel, the relation between the sum of the areas of said openings and the area ofthe cross section of the outlet tube being 1.
  • Strainer for effecting a uniform sucking out of liquor from cellulose digesters, throu h which the liquor is circulated consisting o a ringshaped strainer body adapted to be fitted round the inner circumference of the cellulose digester, said strainer body comprising in combination a primary strainer element having the form of a curved plate body with a great number of small perforations and a secondary strainer element consisting of a curved plate body with a relatively small number of equidistant larger openings, and located at.
  • a bottom plate so as to form a channel between said secondary strainer element and said bottom, an out-suck pipe communicating with said channel, a pump in said out-suck pipe, the relation between the sum of the areas of said openings in the secondary strainer element and the area of cross section of the out-suck pipe being as 1.
  • Strainer as claimed in claim 4 characterized by the fact that the space between the primary and secondary strainer elements is divided into a number of compartments of substantially the same volume, each compartment communicating with the channel throu h one opening.
  • traineraccording to claim 4 characterized by the fact that the openings in the secondary strainer elements are the larger the farther they are situated from the out-suck pipe.

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US590671A 1931-02-06 1932-02-03 Method for the digestion of materials containing cellulose Expired - Lifetime US1914073A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1914073X 1931-02-06

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US1914073A true US1914073A (en) 1933-06-13

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US590671A Expired - Lifetime US1914073A (en) 1931-02-06 1932-02-03 Method for the digestion of materials containing cellulose

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DE (1) DE593473C (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2801918A (en) * 1954-01-07 1957-08-06 Separator Ab Anti-clogging method for circulationheating of cooking liquid for digesters
US2938824A (en) * 1957-01-22 1960-05-31 Kamyr Ab Digestion apparatus and method
US4061193A (en) * 1975-09-15 1977-12-06 Kamyr, Inc. Method and apparatus for digesting cellulose material without screening digesting liquid withdrawn through the digester top

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE746909C (de) * 1938-05-24 1944-06-21 Nordiska Armaturfab Ab Saugsiebanordnung fuer mit einer Umwaelzeinrichtung versehene Zellstoffkocher
DE1096181B (de) * 1958-07-02 1960-12-29 Kamyr Ab Verfahren und Einrichtung zur Ausnutzung der Waerme der Ablauge beim kontinuierlichen Aufschluss von zellstoffhaltigen Rohstoffen unter Druck
DE1262116B (de) * 1958-07-09 1968-02-29 Kamyr Ab Verfahren und Vorrichtung zum Vorwaschen des Zellstoffbreis in einem stehenden Zellstoffkocher

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2801918A (en) * 1954-01-07 1957-08-06 Separator Ab Anti-clogging method for circulationheating of cooking liquid for digesters
US2938824A (en) * 1957-01-22 1960-05-31 Kamyr Ab Digestion apparatus and method
US4061193A (en) * 1975-09-15 1977-12-06 Kamyr, Inc. Method and apparatus for digesting cellulose material without screening digesting liquid withdrawn through the digester top

Also Published As

Publication number Publication date
DE593473C (de) 1934-02-27

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