WO1995025845A1 - Process for combusting sulphite liquor containing magnesium or ammonium, and a boiler for combusting sulphite liquor in accordance with the process - Google Patents
Process for combusting sulphite liquor containing magnesium or ammonium, and a boiler for combusting sulphite liquor in accordance with the process Download PDFInfo
- Publication number
- WO1995025845A1 WO1995025845A1 PCT/SE1995/000255 SE9500255W WO9525845A1 WO 1995025845 A1 WO1995025845 A1 WO 1995025845A1 SE 9500255 W SE9500255 W SE 9500255W WO 9525845 A1 WO9525845 A1 WO 9525845A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- chamber
- combustion
- air
- boiler
- oxygen
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/04—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste liquors, e.g. sulfite liquors
-
- 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
- D21C11/12—Combustion of pulp liquors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2202/00—Combustion
- F23G2202/10—Combustion in two or more stages
- F23G2202/101—Combustion in two or more stages with controlled oxidant supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2207/00—Control
- F23G2207/10—Arrangement of sensing devices
- F23G2207/105—Arrangement of sensing devices for NOx
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2207/00—Control
- F23G2207/30—Oxidant supply
Definitions
- the present invention relates to a process for combusting sulphite liquor which has been separated off after cooking cellulose pulp in accordance with the sulphite method, and to a combustion boiler for imple ⁇ menting the process according to the invention.
- an acidic cooking liquid which contains magnesium sulphite or ammonium sulphite or other salts of sulphurous acidity.
- the sulphite liquor is separated off from the cellulose pulp and is normally evaporated and combusted to extract heat and to recover chemicals such as magnesium oxide, MgO, and sulphur dioxide (S0 2 ) .
- MgO boiler com ⁇ bustion device which is colloquially termed a MgO boiler, since MgO is extracted in particle form from the sulphite liquor.
- MgO boilers consist of two chambers which are usually separated by only one wall and which are designed as one unit, with the addition of liquor and the actual combustion taking place in the one chamber, which, by way of its lower part, communi ⁇ cates with the second chamber.
- the flue gases are therefore pressed downwards in the actual combustion chamber and turn upwards in the second chamber, whose outlet leads from the upper part of the chamber into a so-called superheater for extracting the heat content in the gases.
- the liquor is injected at a certain level and the combustion air is supplied both at the same level and, frequently, at one or more levels below that at which the liquor is sprayed in, i.e. somewhat later in the direction of flow of the combustion gases.
- the walls of these chambers are clad with pipes to which water is supplied for cooling the flue gases and generating steam.
- This steam is collected in the upper part of the plant, in the so- called dome, and is superheated in the superheater to which heat is supplied from the flue gases when the latter leave the second chamber.
- the superheated steam is used as desired. Downstream of the superheater, the flue gases are cooled in several stages and then leave the device at a temperature in the region of 150°C.
- the dust in the flue gases which mainly consists of MgO, is separated off, after which the S0 2 gas is absorbed in an aqueous solution, 1 which is then combined with the magnesium oxide which was previously separated off and used as new cooking liquid.
- Magnesium oxide and sulphur dioxide which are intended to be recovered, and a large quantity of heat are produced during the combustion, in addition to carbon dioxide, water, etc., from the organic part of the liquor. Due to its high melting point, the magnesium oxide comes to be present in solid form as dust particles which accompany the smoke while the sulphur dioxide is present in gaseous form. Thus, no smelt phase in the form of drops, as is found in the recovery of sulphate liquor, occurs in association with sulphite liquor combustion.
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Paper (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP95914607A EP0752025A1 (en) | 1994-03-21 | 1995-03-14 | Process for combusting sulphite liquor containing magnesium or ammonium, and a boiler for combusting sulphite liquor in accordance with the process |
AU21518/95A AU2151895A (en) | 1994-03-21 | 1995-03-14 | Process for combusting sulphite liquor containing magnesium or ammonium, and a boiler for combusting sulphite liquor in accordance with the process |
NO963976A NO963976L (en) | 1994-03-21 | 1996-09-20 | A process for combustion of sulfite liquid containing magnesium or ammonium, and a boiler for combustion of sulfite liquid according to the method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9400930A SE9400930L (en) | 1994-03-21 | 1994-03-21 | Process for combustion of sulfite liquor containing magnesium or ammonium and boiler for combustion of sulfite liquor according to the method |
SE9400930-5 | 1994-03-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995025845A1 true WO1995025845A1 (en) | 1995-09-28 |
Family
ID=20393342
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1995/000255 WO1995025845A1 (en) | 1994-03-21 | 1995-03-14 | Process for combusting sulphite liquor containing magnesium or ammonium, and a boiler for combusting sulphite liquor in accordance with the process |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0752025A1 (en) |
AU (1) | AU2151895A (en) |
NO (1) | NO963976L (en) |
SE (1) | SE9400930L (en) |
WO (1) | WO1995025845A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5715763A (en) * | 1995-09-11 | 1998-02-10 | The Mead Corporation | Combustion system for a black liquor recovery boiler |
EP0905308A1 (en) * | 1997-09-26 | 1999-03-31 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Methods of improving productivity of black liquor recovery boilers |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2354175A (en) * | 1940-07-27 | 1944-07-18 | Babcock & Wilcox Co | Apparatus for the recovery of heat and chemicals from waste liquor |
US2377282A (en) * | 1938-01-26 | 1945-05-29 | George H Tomlinson | Manufacture of sulphite pulp |
WO1992016688A1 (en) * | 1991-03-18 | 1992-10-01 | Götaverken Energy Ab | Method of firing black liquor in recovery boilers and a recovery boiler for firing black liquor |
-
1994
- 1994-03-21 SE SE9400930A patent/SE9400930L/en not_active Application Discontinuation
-
1995
- 1995-03-14 EP EP95914607A patent/EP0752025A1/en not_active Withdrawn
- 1995-03-14 WO PCT/SE1995/000255 patent/WO1995025845A1/en not_active Application Discontinuation
- 1995-03-14 AU AU21518/95A patent/AU2151895A/en not_active Abandoned
-
1996
- 1996-09-20 NO NO963976A patent/NO963976L/en not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2377282A (en) * | 1938-01-26 | 1945-05-29 | George H Tomlinson | Manufacture of sulphite pulp |
US2354175A (en) * | 1940-07-27 | 1944-07-18 | Babcock & Wilcox Co | Apparatus for the recovery of heat and chemicals from waste liquor |
WO1992016688A1 (en) * | 1991-03-18 | 1992-10-01 | Götaverken Energy Ab | Method of firing black liquor in recovery boilers and a recovery boiler for firing black liquor |
Non-Patent Citations (1)
Title |
---|
TAPPI JOURNAL, Volume 76, No. 1, January 1993, MICHAEL BOBIK, "Reducing NOx Emissions from Magnesium Sulfite Liquor Boilers", page 125 - page 132. * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5715763A (en) * | 1995-09-11 | 1998-02-10 | The Mead Corporation | Combustion system for a black liquor recovery boiler |
EP0905308A1 (en) * | 1997-09-26 | 1999-03-31 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Methods of improving productivity of black liquor recovery boilers |
US5992337A (en) * | 1997-09-26 | 1999-11-30 | Air Liquide America Corporation | Methods of improving productivity of black liquor recovery boilers |
US6408771B1 (en) * | 1997-09-26 | 2002-06-25 | Air Liquide America Corporation | Methods of improving productivity of black liquor recovery boilers |
US6799526B2 (en) * | 1997-09-26 | 2004-10-05 | American Air Liquide, Inc. | Methods of improving productivity of black liquor recovery boilers |
Also Published As
Publication number | Publication date |
---|---|
EP0752025A1 (en) | 1997-01-08 |
NO963976D0 (en) | 1996-09-20 |
AU2151895A (en) | 1995-10-09 |
SE9400930L (en) | 1995-09-22 |
NO963976L (en) | 1996-10-17 |
SE9400930D0 (en) | 1994-03-21 |
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