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Bio-refinery system in a pulp mill for methanol production with comparison of pressurized black liquor gasification and dry gasification using direct causticization
Mälardalen University, School of Business, Society and Engineering, Future Energy Center. Department of Chemical Engineering and Technology, KTH.ORCID iD: 0000-0002-4359-2232
Mälardalen University, School of Sustainable Development of Society and Technology. Mälardalen University, School of Business, Society and Engineering, Future Energy Center. (Bioenergy research group)ORCID iD: 0000-0003-0300-0762
Mälardalen University, School of Sustainable Development of Society and Technology. Mälardalen University, School of Business, Society and Engineering, Future Energy Center. (Bioenergy research group)ORCID iD: 0000-0002-7233-6916
2012 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 90, no 1, p. 24-31Article in journal (Other academic) Published
Abstract [en]

Black liquor gasification (BLG) for bio-fuel or electricity production at the modern pulp mills is a field incontinuous evolution and the efforts are considerably driven by the climate change, fuel security, andrenewable energy. This paper evaluates and compares two BLG systems for methanol production: (i) oxygenblown pressurized thermal BLG; and (ii) dry BLG with direct causticization, which have beenregarded as the most potential technology candidates for the future deployment. A key objective is toassess integration possibilities of BLG technologies with the reference Kraft pulp mill producing1000 air dried tonnes (ADt) pulp/day replacing conventional recovery cycle. The study was performedto compare the systems’ performance in terms of potential methanol production, energy efficiency,and potential CO2 reductions. The results indicate larger potential of black liquor conversion to methanolfrom the pressurized BLG system (about 77 million tonnes/year of methanol) than the dry BLG system(about 30 million tonnes/year of methanol) utilizing identical amount of black liquor available worldwide(220 million tDS/year). The potential CO2 emissions reduction from the transport sector is substantiallyhigher in pressurized BLG system (117 million tonnes/year CO2 reductions) as compared to dry BLGsystem (45 million tonnes/year CO2 reductions). However, the dry BLG system with direct causticizationshows better results when considering consequences of additional biomass import. In addition,comparison of methanol production via BLG with other bio-refinery products, e.g. hydrogen, dimethylether (DME) and bio-methane, has also been discussed.

Place, publisher, year, edition, pages
2012. Vol. 90, no 1, p. 24-31
Keywords [en]
Bio-fuel, Bio-refinery, Black liquor gasification, Methanol, Pulp mill
National Category
Other Industrial Biotechnology
Identifiers
URN: urn:nbn:se:mdh:diva-11653DOI: 10.1016/j.apenergy.2010.12.074ISI: 000297426100005Scopus ID: 2-s2.0-80055032072OAI: oai:DiVA.org:mdh-11653DiVA, id: diva2:393810
Available from: 2011-02-04 Created: 2011-02-01 Last updated: 2017-12-11

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Naqvi, MuhammadYan, JinyueDahlquist, Erik

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