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An innovative system by integrating the gasification unit with the supercritical water unit to produce clean syngas: Effects of operating parameters
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Chemical Technology.
2016 (English)In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 41, no 33, 14573-14582 p.Article in journal (Refereed) Published
Abstract [en]

Advanced technologies such as solid oxide fuel cells generally have a strict requirement on syngas quality especially the concentration of impurities. It is common to sacrifice economy and efficiency to achieve a qualified syngas by applying several cleaning and conditioning steps. The objective of this work is to propose a combined process by integrating the gasification unit with the supercritical water unit (SWU) to provide qualified syngas. The SWU includes supercritical water mixer, separator, supercritical water reactor (SWR) and expander. Detailed operating methods and appropriate equipment are presented. The whole process is modeled by using Aspen Plus to investigate effects of SWR inlet temperature, operating pressure, and mass ratio of tars to supercritical water (T/W) on the final product composition and on the outlet temperature of SWR. Results show that higher SWR inlet temperature facilitates achieving a higher H-2 and CO yield while lower inlet temperature assists in obtaining a higher H-2/CO ratio. Lower SWR operating pressure benefits to achieve a higher H-2 and CO yield and a higher H-2/CO ratio. Lower T/W benefits to have a higher H-2 yield and a lower CO yield, leading to a higher H-2/CO. Tars could be completely decomposed at the given operating conditions in the proposed process. Higher inlet temperature, higher pressure and larger T/W lead to an increased SWR outlet temperature. Combustible components in the syngas mainly contains H-2, CO, and CH4.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 41, no 33, 14573-14582 p.
Keyword [en]
Biomass gasification, Supercritical water, System integration, Operating parameters
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-192710DOI: 10.1016/j.ijhydene.2016.04.237ISI: 000381844300009OAI: diva2:974497

QC 20160926

Available from: 2016-09-26 Created: 2016-09-20 Last updated: 2016-09-26Bibliographically approved

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