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White liquor production: A comparison of the causticizing stages using gasifier and recovery boiler produced green liquor
2010 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Green liquor, starting with sludge removal and ending with white liquor separation, has been investigated from a recovery boiler and a state-of-the-art gasification unit using the same black liquor for the two processes. This has been possible due to the co-location of a demonstration-sized pressurized gasification unit and a recovery boiler. Tests were performed under varying conditions in the gasifier while the conditions in the recovery boiler were assumed constant. Our investigation shows that the separation properties of green liquor sludge after a gasifier are almost similar to the separation properties after a recovery boiler. It is clear that the total load of reburned lime mud increases in the case of a gasifier, but the total concentration of the produced white liquor equals mill demand (i.e. is the same as recovery boiler produced white liquor). It was also found that causticizing efficiency was not affected by the increased load of reburned lime mud and the changed composition in the gasifier produced green liquor. Therefore, it can be concluded that the formation of sodium hydroxide in the white liquor produced from an entrained flow gasifier will not be limited by the existing process technology.

Place, publisher, year, edition, pages
2010.
National Category
Other Chemical Engineering
Identifiers
URN: urn:nbn:se:hb:diva-6339Local ID: 2320/6324OAI: oai:DiVA.org:hb-6339DiVA: diva2:887026
Conference
International Chemical Recovery Conference, Williamsburg, March 29 – April 1, 2010
Funder
Swedish Energy AgencyMistra - The Swedish Foundation for Strategic Environmental Research
Note

Sponsorship:

SmurfitKappa, SCA Packaging AB, The Södra Foundation for Research, Development and Education, Sveaskog AB, Chemrec AB and the County Administrative Board of Norrbotten

Available from: 2015-12-22 Created: 2015-12-22 Last updated: 2016-10-17Bibliographically approved

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Richards, Tobias

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  • apa
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  • de-DE
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