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Torrefaction and gasification of biomass. The potential of torrefaction combined with entrained-flow gasification for production of synthesis gas
KTH, School of Chemical Science and Engineering (CHE).
2012 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Torrefaction of biomass together with gasification in entrained-flow reactors is a new possible way of producing synthesis gas. The synthesis gas can later be used for the production of renewable liquid fuels. This is highly desirable since the transport sector consumes a high amount of fossil fuels that has to be exchanged for renewable fuels in the future. It is hard to tell if the technology above is an advantageous way or not to produce synthesis gas since it is very newly developed. A lot of obstacles exist such as the injection of the torrefied wood into the gasifier, the optimization of the ash flow down the entrained flow reactor and the high energy consumption of the drying. Investigation in the form of material and energy balances shows that the system can have as high energy efficiency as 73% and cold gas efficiency of 74% which is only slightly less then what the fluid-bed gasification has. Torrefaction and gasification developers allocate huge amount of money to develop torrefaction and entrained-flow gasification units. Interviews show that many experts believe that the technology will be commercial and used to produce renewable liquid fuels in the future.

Place, publisher, year, edition, pages
2012. , 75 p.
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-146313OAI: diva2:723789
Available from: 2014-06-12 Created: 2014-06-11 Last updated: 2014-06-12Bibliographically approved

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