US1368577A - Method of short-time digesting in sulfite or sulfate digesters - Google Patents

Method of short-time digesting in sulfite or sulfate digesters Download PDF

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Publication number
US1368577A
US1368577A US281704A US28170419A US1368577A US 1368577 A US1368577 A US 1368577A US 281704 A US281704 A US 281704A US 28170419 A US28170419 A US 28170419A US 1368577 A US1368577 A US 1368577A
Authority
US
United States
Prior art keywords
steam
time
boiler
sulfate
pressure
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.)
Expired - Lifetime
Application number
US281704A
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English (en)
Inventor
Ruths Johannes Karl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vaporackumulator AB
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to DE1917300584D priority Critical patent/DE300584C/de
Priority to AT80493D priority patent/AT80493B/de
Priority to DE1919316468D priority patent/DE316468C/de
Priority to DK27191D priority patent/DK27191C/da
Application filed by Individual filed Critical Individual
Priority to US281704A priority patent/US1368577A/en
Priority to GB13654/19A priority patent/GB144084A/en
Priority to FR518153A priority patent/FR518153A/fr
Application granted granted Critical
Publication of US1368577A publication Critical patent/US1368577A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D21C1/02—Pretreatment of the finely-divided materials before digesting with water or 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
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/22—Other features of pulping processes

Definitions

  • My present invention relates to an im provement for obtaining a further considerable increase of the advantages gained by an arrangement according to the abovenamed patent.
  • FIG. 2- is a boiling diagram
  • Fig. 3 is a diagranr to illustrate my new method applied to a plant with four digesters.
  • S is the quantit of steam required for the steaming, and denotes the quantity of steam required for the digesting.
  • the diesting takes place in the following manner. in the period between the steaming and the starting of the digesting process the and required for the digesting is run into the digestcrs, said acid absorbin the heat 1mparted to the chips so that t ie temperature of the acid is somewhat increased. In most cases this temperature will be about 50 at the time a. At the end of the digesting period, 2'. 0., at the point D, the temperature of the acid genera ly amounts to about 140.
  • the chemical process in the boiler only commences upon the acid having reached the temperature of about 108, at the point 0.
  • the time 11-1: is called the startin period of the boiler. while the timer-u correspom'ls to the true tune of boilmg. If it is now desired to reduce the time (Ii-b Specification of Letters Patent.
  • the quantity of steam B suppliedduring the starting period may be chosen considorably higher than at present. the time being thereby reduced in a corresponding degree.
  • Fig. 2 iilustrate the appearance of the boiling diagram when using the arrangements suggested above. 5 again corresponds to the quantity of steam requisite for the steaming operation, r!-(.' being the starting period; the diagram for the boiling time proper, cl1. is the same as before. In Fig. 2 it is assumed that during the first period of the boiling. while the pressure in the boiler is still low, a quantity of steam T is admitted directly into the acid, in addition to the steam admitted into the tubes.
  • Fig. 3 indicates how this method is working as applied to a plant with tour boilers and with a total time for treatment, which from the original of 20 hours has been reduced to 17 hours by the present invention.
  • the bottom load represents the quantity of steam requisite for the cone pleting of the boiling, the tops partly giving the quantities of steam for the steaming operation. and partly the quantity of steam required for the starting up to 108.
  • K shows the quantity of steam delivered from the boiler, and. as will be seen in the present case, a complete equalization of the same is taking place. the working of the boiler being thereby rendered practically uniform.
  • the accumulator is charged during the time (1-6, discharged during the time bc, charged anew during the time c-d and discharged during the time d-e, charged again during the time cf and so on.
  • the charging condition of the accumulator is ind]- rated in the upper part of the diagram.
  • the method of shorttime digesting in sullite or sulfate digcsters which consists in elieeting both the steaming and the starting operation with steam of low pressure obtained from an accumulator connected with the digester. and then completing the digesting operation with steam of higher pressure as supplied by the steam generating plant.

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  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Commercial Cooking Devices (AREA)
  • Paper (AREA)
US281704A 1916-02-26 1919-03-10 Method of short-time digesting in sulfite or sulfate digesters Expired - Lifetime US1368577A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
DE1917300584D DE300584C (enrdf_load_stackoverflow) 1916-02-26 1917-02-27
AT80493D AT80493B (de) 1916-02-26 1917-03-06 Verfahren um in Sulfitfabriken das Dämpfen in kurzVerfahren um in Sulfitfabriken das Dämpfen in kurzer Zeit durchzuführen. er Zeit durchzuführen.
DE1919316468D DE316468C (enrdf_load_stackoverflow) 1916-02-26 1919-01-09
DK27191D DK27191C (da) 1916-02-26 1919-01-28 Anordning ved Sulfitkogere til forberedende Opvarmning ved Damp paa kort Tid.
US281704A US1368577A (en) 1916-02-26 1919-03-10 Method of short-time digesting in sulfite or sulfate digesters
GB13654/19A GB144084A (en) 1916-02-26 1919-05-29 Improvements in methods of heating sulphite and like digesters
FR518153A FR518153A (fr) 1916-02-26 1919-07-08 Perfectionnements dans les installations de chaudière à sulfite

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE300584X 1916-02-26
US281704A US1368577A (en) 1916-02-26 1919-03-10 Method of short-time digesting in sulfite or sulfate digesters

Publications (1)

Publication Number Publication Date
US1368577A true US1368577A (en) 1921-02-15

Family

ID=23078428

Family Applications (1)

Application Number Title Priority Date Filing Date
US281704A Expired - Lifetime US1368577A (en) 1916-02-26 1919-03-10 Method of short-time digesting in sulfite or sulfate digesters

Country Status (6)

Country Link
US (1) US1368577A (enrdf_load_stackoverflow)
AT (1) AT80493B (enrdf_load_stackoverflow)
DE (2) DE300584C (enrdf_load_stackoverflow)
DK (1) DK27191C (enrdf_load_stackoverflow)
FR (1) FR518153A (enrdf_load_stackoverflow)
GB (1) GB144084A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
DK27191C (da) 1921-02-21
FR518153A (fr) 1921-05-20
GB144084A (en) 1920-06-10
AT80493B (de) 1920-04-10
DE300584C (enrdf_load_stackoverflow) 1917-09-18
DE316468C (enrdf_load_stackoverflow) 1919-12-05

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