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Title: A hot syngas purification system integrated with downdraft gasification of municipal solid waste
Authors: Chan, Wei Ping
Veksha, Andrei
Lei, Junxi
Oh, Wen-Da
Dou, Xiaomin
Giannis, Apostolos
Lisak, Grzegorz
Lim, Teik-Thye
Keywords: Syngas Purification
Municipal Solid Waste
Engineering::Civil engineering
Issue Date: 2019
Source: Chan, W. P., Veksha, A., Lei, J., Oh, W.-D., Dou, X., Giannis, A., . . . Lim, T.-T. (2019). A hot syngas purification system integrated with downdraft gasification of municipal solid waste. Applied Energy, 237, 227-240. doi:10.1016/j.apenergy.2019.01.031
Series/Report no.: Applied Energy
Abstract: Gasification of municipal solid waste (MSW) with subsequent utilization of syngas in gas engines/turbines and solid oxide fuel cells can substantially increase the power generation of waste-to-energy facilities and optimize the utilization of wastes as a sustainable energy resources. However, purification of syngas to remove multiple impurities such as particulates, tar, HCl, alkali chlorides and sulfur species is required. This study investigates the feasibility of high temperature purification of syngas from MSW gasification with the focus on catalytic tar reforming and desulfurization. Syngas produced from a downdraft fixed-bed gasifier is purified by a multi-stage system. The system comprises of a fluidized-bed catalytic tar reformer, a filter for particulates and a fixed-bed reactor for dechlorination and then desulfurization with overall downward cascading of the operating temperatures throughout the system. Novel nano-structured nickel catalyst supported on alumina and regenerable Ni-Zn desulfurization sorbent loaded on honeycomb are synthesized. Complementary sampling and analysis methods are applied to quantify the impurities and determine their distribution at different stages. Experimental and thermodynamic modeling results are compared to determine the kinetic constraints in the integrated system. The hot purification system demonstrates up to 90% of tar and sulfur removal efficiency, increased total syngas yield (14%) and improved cold gas efficiency (12%). The treated syngas is potentially applicable in gas engines/turbines and solid oxide fuel cells based on the dew points and concentration limits of the remaining tar compounds. Reforming of raw syngas by nickel catalyst for over 20 h on stream shows strong resistance to deactivation. Desulfurization of syngas from MSW gasification containing significantly higher proportion of carbonyl sulfide than hydrogen sulfide, traces of tar and hydrogen chloride demonstrates high performance of Ni-Zn sorbents.
ISSN: 0306-2619
DOI: 10.1016/j.apenergy.2019.01.031
Rights: © 2019 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles
NEWRI Journal Articles

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