US3325970A - Method of condensing blow-off steam in sulphate pulping - Google Patents

Method of condensing blow-off steam in sulphate pulping Download PDF

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Publication number
US3325970A
US3325970A US325876A US32587663A US3325970A US 3325970 A US3325970 A US 3325970A US 325876 A US325876 A US 325876A US 32587663 A US32587663 A US 32587663A US 3325970 A US3325970 A US 3325970A
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United States
Prior art keywords
condensate
steam
blow
conduit
accumulator
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Expired - Lifetime
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US325876A
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English (en)
Inventor
Axelsson Karl Olle
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Rosenblads Patenter AB
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Rosenblads Patenter AB
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D19/00—Degasification of liquids
    • B01D19/0068—General arrangements, e.g. flowsheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
    • B01D5/0057—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes
    • B01D5/006—Condensation of vapours; Recovering volatile solvents by condensation in combination with other processes with evaporation or distillation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
    • B01D5/0078—Condensation of vapours; Recovering volatile solvents by condensation characterised by auxiliary systems or arrangements
    • B01D5/009—Collecting, removing and/or treatment of the condensate
    • 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
    • D21C11/06—Treatment of pulp gases; Recovery of the heat content of the gases; Treatment of gases arising from various sources in pulp and paper mills; Regeneration of gaseous SO2, e.g. arising from liquors containing sulfur compounds

Definitions

  • the present invention relates to the condensation of steam, herein referred to as blow-off steam, which is released at the blowing of a sulphate pulping digester.
  • This blow-off steam contains noncondensable gases such as hydrogen sulphide, mercaptans, etc. which are absorbed by the blow-oft" steam condensate but cannot be allowed to accompany the condensate through the exhaust to the surroundings without substantial disadvantages.
  • the main object of the invention is to purify, refine or clean the blow-off steam condensate by evaporating these gases out of the condensate in the particular case where the blow-off steam is condensed during the blowing in a known and much used type of blow-off steam condenser system.
  • the hot condensate is fed to the upper part of an accumulator in which it is accumulated with such circulation that the hot condensate is collected in the upper part of the accumulator while the cooled condensate is collected in the lower part of the accumulator. From the lower part the cooled condensate is circulated as a cooling medium for the condensation of the steam whereby the cooled condensate is reheated and returned to the upper part of the accumulator.
  • the invention is characterized mainly in that the accumulated blow-off steam condensate is conducted in a hot condition from the upper part of the accumlator without material cooling to an evaporator where noncondensable gases contained in the condensate are evaporated in a known manner by means of a suitable evaporating medium, whereupon the cleaned or purified blow-off steam condensate is conducted out of the combined blow-01f condenser-evaporator system.
  • FIG. 1 illustrates a condenser and evaporator set-up for practising the invention
  • FIG. 2 illustrates a modified part of the arrangement according to FIG.1.
  • numeral 1 indicates a condenser usually of the radiating type in which blow-oil steam, which is fed through conduit 2, is condensed and from which the condensate thus formed is conducted through conduit 3 to the upper part of an accumulator 4 by way of a separator section 5.
  • this separator section of the accumulator the condensate is separated from any residual steam and gases not absorbed by the condensate. This residual steam and gas is led off through conduit 6 and possibly through an aftercondenser which is often used but not shown in the figure.
  • the condensate is collected in the accumulator to a maximum level 7 determined by outlet 8 which extends from the bottom part of the accumulator to this level where it is connected to the atmosphere by connection 9.
  • the condensate collected in the accumlator is circulated from the upper to the lower part of the accumulator through an external path consisting of conduit 10, pump 11, conduit 12, control valve 13, indirect cooler 14 and conduit 15. Thereby the condensate is stratified so that hot condensate is collected in the upper part of the accumulator and cooled condensate is collected in the 3,325,979 Patented June 20, 1967 lower part. At each blow-off the required amount of condensate is pumped by pump 17 from the lower part of the accumulator through conduit 16 and control valve 18 to act as a cooling medium for condenser 1.
  • the devices which are directly required for practicing the invention consist of a branch conduit 21 with control valve 22 leading from conduit 12 through which hot condensate is fed to evaporator 23 which includes inlet 24 for the gaseous evaporating medium, outlet 25 for clean or purified condensate and outlet 26 for the exhaust gases conisting of noncondensable gases from the condensate mixed with the evaporating medium.
  • All of the condensate which shall be removed from the system via the evaporator and outlet 25 is taken out of the amount of hot condensate circulated by pump 11. It is essential for the invention that the condensate arrives at the evaporator in a hot condition. For this reason the conduit 21 should be as short as possible and/or well insulated.
  • the essential advantage is that evaporating can be carried out at high temperature and thus with high effect.
  • the evaporating medium which for example can be air taken from the atmosphere, is supplied at low temperature by means of a blowing fan. This results in the lowest possible operating costs and is especially suitable of the noncondensable gases are to be recovered out of the exhaust gases from the evaporator for use in pulp production. These noncondensable gases can be recovered by absorbing them in some process fluid, for example white liquor.
  • a secondary, but not unimportant advantage of the invention is that the same evaporator utilized for the blowolf steam condensate can at the same time be utilized also for other condensates resulting from sulphate pulping. Some of these other condensates, especially the digester condensate, could be suitably cleaned through evaporating in which the heat supplied by the blow-01f steam contributes to the purifying of these condensates.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)
US325876A 1962-12-03 1963-11-26 Method of condensing blow-off steam in sulphate pulping Expired - Lifetime US3325970A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1297662 1962-12-03

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US3325970A true US3325970A (en) 1967-06-20

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US325876A Expired - Lifetime US3325970A (en) 1962-12-03 1963-11-26 Method of condensing blow-off steam in sulphate pulping

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US (1) US3325970A (enrdf_load_html_response)
AT (1) AT250771B (enrdf_load_html_response)
DE (1) DE1233709B (enrdf_load_html_response)
FI (1) FI40356B (enrdf_load_html_response)
FR (1) FR1375588A (enrdf_load_html_response)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4330307A (en) * 1980-04-07 1982-05-18 Coury Glenn E Method of separating a noncondensable gas from a condensable vapor
US4421597A (en) * 1981-12-08 1983-12-20 Georgia-Pacific Corporation Method for recovering heat in an alkaline pulp digesting process
US4568422A (en) * 1981-12-08 1986-02-04 Georgia-Pacific Corporation System for recovering heat in an alkaline pulp digesting process
WO1993015816A1 (de) * 1992-02-12 1993-08-19 Henkel Kommanditgesellschaft Auf Aktien Verfahren zur verbesserten brüdenentsorgung bei der heissdampftrocknung
US20060277763A1 (en) * 2005-06-08 2006-12-14 North American Tile Tool Company Tile nippers

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2418167A (en) * 1940-10-05 1947-04-01 Paper Patents Co Recovery of so2 from digester blowoff gases
US2598116A (en) * 1948-05-07 1952-05-27 Paper Patents Co Process for cooling sulfur burner gas
US2626005A (en) * 1949-01-08 1953-01-20 Worthington Corp Method and apparatus for removal of ammonia in boiler feedwater systems
US3087790A (en) * 1959-09-04 1963-04-30 Iowa State College Res Found Reductive decomposition of calcium sulfate
US3210912A (en) * 1963-09-23 1965-10-12 Westinghouse Electric Corp Removal of soluble gases from a steam generator feedwater system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3028295A (en) * 1958-06-11 1962-04-03 B T Metoder Ab Method and apparatus for removing obnoxious odors from gases

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2418167A (en) * 1940-10-05 1947-04-01 Paper Patents Co Recovery of so2 from digester blowoff gases
US2598116A (en) * 1948-05-07 1952-05-27 Paper Patents Co Process for cooling sulfur burner gas
US2626005A (en) * 1949-01-08 1953-01-20 Worthington Corp Method and apparatus for removal of ammonia in boiler feedwater systems
US3087790A (en) * 1959-09-04 1963-04-30 Iowa State College Res Found Reductive decomposition of calcium sulfate
US3210912A (en) * 1963-09-23 1965-10-12 Westinghouse Electric Corp Removal of soluble gases from a steam generator feedwater system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4330307A (en) * 1980-04-07 1982-05-18 Coury Glenn E Method of separating a noncondensable gas from a condensable vapor
US4421597A (en) * 1981-12-08 1983-12-20 Georgia-Pacific Corporation Method for recovering heat in an alkaline pulp digesting process
US4568422A (en) * 1981-12-08 1986-02-04 Georgia-Pacific Corporation System for recovering heat in an alkaline pulp digesting process
WO1993015816A1 (de) * 1992-02-12 1993-08-19 Henkel Kommanditgesellschaft Auf Aktien Verfahren zur verbesserten brüdenentsorgung bei der heissdampftrocknung
US20060277763A1 (en) * 2005-06-08 2006-12-14 North American Tile Tool Company Tile nippers

Also Published As

Publication number Publication date
FI40356B (enrdf_load_html_response) 1968-09-02
AT250771B (de) 1966-11-25
FR1375588A (fr) 1964-10-16
DE1233709B (de) 1967-02-02

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