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Experimental and modelling studies on condensation of inorganic species during cooling of product gas from pressurized biomass fluidized bed gasification
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Process Technology.ORCID iD: 0000-0002-6326-4084
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Energy and Furnace Technology.ORCID iD: 0000-0002-1837-5439
EON Gas Sverige AB, SE-20509 Malmo, Sweden..
2018 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 153, p. 35-44Article in journal (Refereed) Published
Abstract [en]

In a biomass gasification process, condensation of inorganic species can cause problems such as corrosion and deposition on the downstream equipment. In this work, in order to investigate the condensation of inorganics during the gas cooling step of the biomass gasification system, both experimental and modelling studies were conducted. Experiments were performed on a pilot-scale steam/oxygen blown fluidized bed gasification facility. A CO2 cooled probe was located at the head of a filter to condense inorganic species. Five thermocouples were used to monitor the probe temperature profile. Deposits on the probe were characterized using scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDS) to analyze the elemental composition of deposits. A process model based on the local chemical and phase equilibriums was developed using software SimuSage to predict both release and condensation of inorganics. A customized thermodynamic database extracted from the FactSage 7.1 was used during model calculations. Two cases including with and without addition of bed material were calculated. Results show that the identified elemental compositions of deposit under different gas cooling temperatures reasonably agree with the elemental compositions predicted by model calculations. This demonstrates that the established model and the customized thermodynamic data are valid. A large amount of carbon is identified in the deposit of low temperature probe sections, which may come from the condensed tar. Additionally, a temperature window is found, where melts are formed during gas cooling.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 153, p. 35-44
Keywords [en]
Biomass, Inorganics, Condensation, Gasification
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-234209DOI: 10.1016/j.energy.2018.04.031ISI: 000436651100005Scopus ID: 2-s2.0-85046675283OAI: oai:DiVA.org:kth-234209DiVA, id: diva2:1245665
Note

QC 20180905

Available from: 2018-09-05 Created: 2018-09-05 Last updated: 2018-11-29Bibliographically approved

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Wan, WeiEngvall, KlasYang, Weihong

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