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WO1988003191A1 - Procede et appareil de combustion de liqueur noire de soude - Google Patents

Procede et appareil de combustion de liqueur noire de soude Download PDF

Info

Publication number
WO1988003191A1
WO1988003191A1 PCT/FI1987/000144 FI8700144W WO8803191A1 WO 1988003191 A1 WO1988003191 A1 WO 1988003191A1 FI 8700144 W FI8700144 W FI 8700144W WO 8803191 A1 WO8803191 A1 WO 8803191A1
Authority
WO
WIPO (PCT)
Prior art keywords
reactor
black liquor
gas flow
separator
cyclone separator
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.)
Ceased
Application number
PCT/FI1987/000144
Other languages
English (en)
Inventor
Erkki KIISKILÄ
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.)
Ahlstrom Corp
Original Assignee
Ahlstrom Corp
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
Application filed by Ahlstrom Corp filed Critical Ahlstrom Corp
Priority to BR8707849A priority Critical patent/BR8707849A/pt
Publication of WO1988003191A1 publication Critical patent/WO1988003191A1/fr
Priority to KR1019880700766A priority patent/KR880701801A/ko
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/04—Regeneration of pulp liquors or effluent waste waters of alkali lye
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
    • C01D1/04—Hydroxides
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
    • C01D1/04—Hydroxides
    • C01D1/20—Preparation by reacting oxides or hydroxides with alkali metal salts
    • C01D1/22—Preparation by reacting oxides or hydroxides with alkali metal salts with carbonates or bicarbonates
    • 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
    • D21C11/063—Treatment of gas streams comprising solid matter, e.g. the ashes resulting from the combustion of black liquor
    • D21C11/066—Separation of solid compounds from these gases; further treatment of recovered products
    • 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
    • D21C7/04—Linings

Definitions

  • the present invention relates to a method for combustio soda black liquor and to an apparatus for carrying out method.
  • U.S. patent specification no. 4,224,289 discloses a metho combusting sulfur-free soda black liquor in a bubbling fl ized bed reactor by using a bed of iron oxide at a tempera higher than the melting point of sodium carbonate.
  • the bustion produces sodium ferrite.
  • the sodium hydroxide in the digestion process is regenerated by immersing sodium ferrite in hot water.
  • the sedimented iron oxid separated and recirculated to the fluidized bed.
  • a bubbling fluidized bed combustion has e.g. the follo drawback:
  • the particle size of the iron oxide/sodium ferrite ha adequate (> 1 mm) to prevent the chemical from flowing ou the reactor with the gas flow
  • the object of the invention is to provide a method and apparatus by which the volume of iron oxide required in combustion process can be remarkably reduces.
  • a characteristic feature of the invention is that the comb tion is carried out in a circulating fluidized bed reac and that particles substantially of the size larger than ⁇ m are separated from the lue gases-and recirculated to reactor.
  • the separator has to be designed so as to allow the f fraction of less than 50 ⁇ m -to pass through for which a sh circulation time is adequate in order to be saturated w alkali. If the Fe/Na mole ratio approaches 1.0 the ash beco sticky and results in deposition in the hot separator.
  • the apparatus intended specifically for carrying out method of the invention is characterized in that there upwards directed nozzles provided at or underneath the lo end of the cone of the cyclone separator.
  • Fig. 1 illustrates the alkalinity of the product ash a function of the particle size
  • Fig. 2 is a schematical illustration of an apparatus carrying out the method of the invention
  • Fig. 3 is a vertical section of a cyclone separator app to the method of the invention.
  • black liquor and Fe 2 0 3 is supplied to a circula fluidized bed reactor 1 via ducts 2 and 3. Also ozygen- taining gas such as air required for combustion and flu zation is supplied to the reactor.
  • the gas flow rate in reactor is maitained high enough to ensure that small parti follow the gas flow and are transported out of the rea with -the gas.
  • the reactor is provided with a separator 4 designed to a the fine fraction of less than 50 ⁇ m to pass through.
  • coarser solid material preferably " of particle size 200 100 ⁇ m, is separated from the gas and recycled via duct 5 the reactor so that the iron oxide particles which are yet saturated with alkali are again brought to contact the black liquor and can react with the sodium compounds the liquor.
  • the sodium ferrite produced in the combustion removed from the bottom of the reactor via duct 6 and sodium hydroxide is regenerated by immersing the sodium ferr compound in hot water.
  • FIG 3 illustrates a cyclone separator 7 applicable in method of the invention.
  • the gases discharged from the reac 1, as illustrated in Figure 2 are guided to the upper par of the cyclone via an inlet duct 9 connected tangentially the upper part.
  • the separated solid material is dischar via an outlet 11 provided at the conical bottom portion 10 the separator. Gas is removed via an outlet 12 provi centrally in the upper part of the cyclone.
  • Below the bot of the cone there are nozzles 13 directed upwards and connec and connected to an annular feed chamber to which also inlet duct for air is connected.
  • the inlet duct is n illustrated in the Figure.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
  • Cyclones (AREA)
  • Treating Waste Gases (AREA)

Abstract

Lors de la combustion de liqueur noire de soude exempte de soufre en présence d'oxyde de fer dans un réacteur à lit fluidisé pourvu d'un lit à circulation, la fraction des particules dont la granulométrie est supérieure à 50 mum est séparée des gaz de fumée et recyclée dans le réacteur. Dans un mode de réalisation préféré de la présente invention, la séparation est effectuée dans un séparateur cyclone (7), dont la capacité de séparation est commandée par un flux d'air dirigé vers le haut acheminé dans le fond de la partie conique (10) du séparateur.
PCT/FI1987/000144 1986-10-31 1987-10-29 Procede et appareil de combustion de liqueur noire de soude Ceased WO1988003191A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BR8707849A BR8707849A (pt) 1986-10-31 1987-10-29 Processo de combustao de liquido negro de soda isento de enxofre e aparelho para realizacao do mesmo
KR1019880700766A KR880701801A (ko) 1986-10-31 1988-06-30 소다 블랙(Soda Black) 용액의 연소방법 및 장치

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI864436A FI77278C (fi) 1986-10-31 1986-10-31 Foerfarande och anordning foer foerbraenning av sodasvartlut.
FI864436 1986-10-31

Publications (1)

Publication Number Publication Date
WO1988003191A1 true WO1988003191A1 (fr) 1988-05-05

Family

ID=8523417

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1987/000144 Ceased WO1988003191A1 (fr) 1986-10-31 1987-10-29 Procede et appareil de combustion de liqueur noire de soude

Country Status (7)

Country Link
JP (1) JPH01502761A (fr)
KR (1) KR880701801A (fr)
AU (1) AU600048B2 (fr)
BR (1) BR8707849A (fr)
FI (1) FI77278C (fr)
SU (1) SU1766244A3 (fr)
WO (1) WO1988003191A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994007797A1 (fr) * 1992-09-30 1994-04-14 North Broken Hill Limited Procede de recuperation d'hydroxyde de metal alcalin a partir de liqueurs organiques
US7507715B2 (en) 1997-06-19 2009-03-24 Nps Allelix Corp. Methods useful in the treatment of bone resorption diseases

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4526760A (en) * 1982-07-21 1985-07-02 International Paper Co. Recovery of heat and chemical values from spent pulping liquors
EP0223438A1 (fr) * 1985-10-29 1987-05-27 Research Association of Pulp and Paper Technology Procédé de récupération d'hydroxyde de sodium à partir d'une liqueur alcaline usée dérivant de la préparation de pâte

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59164627A (ja) * 1983-03-09 1984-09-17 Mitsubishi Heavy Ind Ltd パルプ廃液ソ−ダ回収方法
JPS602791A (ja) * 1983-06-21 1985-01-09 製紙技術研究組合 流動層を用いた直接苛性化方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4526760A (en) * 1982-07-21 1985-07-02 International Paper Co. Recovery of heat and chemical values from spent pulping liquors
EP0223438A1 (fr) * 1985-10-29 1987-05-27 Research Association of Pulp and Paper Technology Procédé de récupération d'hydroxyde de sodium à partir d'une liqueur alcaline usée dérivant de la préparation de pâte

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994007797A1 (fr) * 1992-09-30 1994-04-14 North Broken Hill Limited Procede de recuperation d'hydroxyde de metal alcalin a partir de liqueurs organiques
US5545385A (en) * 1992-09-30 1996-08-13 Amcor Limited Process for recovering alkali metal hydroxide from organic liquors
US7507715B2 (en) 1997-06-19 2009-03-24 Nps Allelix Corp. Methods useful in the treatment of bone resorption diseases
US7749543B2 (en) 1997-06-19 2010-07-06 Nps Pharmaceuticals, Inc. Methods useful in the treatment of bone resorption diseases
US8765674B2 (en) 1997-06-19 2014-07-01 Nps Pharmaceuticals, Inc. Methods useful in the treatment of bone resorption diseases

Also Published As

Publication number Publication date
AU600048B2 (en) 1990-08-02
JPH0253553B2 (fr) 1990-11-19
FI77278C (fi) 1989-02-10
BR8707849A (pt) 1989-10-03
FI77278B (fi) 1988-10-31
KR880701801A (ko) 1988-11-05
SU1766244A3 (ru) 1992-09-30
AU8174487A (en) 1988-05-25
FI864436A0 (fi) 1986-10-31
JPH01502761A (ja) 1989-09-21
FI864436L (fi) 1988-05-01

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