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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Advanced Syngas Upgrading Process for Conversion of Low-Rank Coals to Liquid Fuels
Author(s)
Andrew Lucero1, Amit Goyal1, Kevin McCabe1, Gerald Choi2, Haoren Lu2 and Santosh Gangwal1
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DOI:10.17265/2328-2193/2016.05.002
Affiliation(s)
1. Southern Research, 5201 International Dr., Durham, NC 27712, USA
2. Nexant, Inc., 101 2nd Street, 10th Floor, San Francisco 94105, CA
ABSTRACT
Syngas
cleanup is a major challenge in any coal or biomass gasification application. A
modified syngas cleanup process is under development to improve syngas from low
rank coals for CTL (coal to liquids) applications. Novel steam reforming
catalysts were developed to convert tars and light hydrocarbons and decompose
ammonia in the presence of syngas contaminants such as H2S (< 500 ppm). Process goals are to improve syngas yield and
H2:CO ratio while reducing water gas shift and downstream gas
cleanup requirements. Laboratory reforming experiments were focused on
developing information to support a techno-economic analysis using TRIG (transport
reactor integrated gasifiers) or LURGI gasifiers. A CTL with carbon capture
model was developed to compare the economics of the new process including the
catalytic steam reforming to DOE (Department of Energy) baseline CTL. Reforming
catalysts were developed that had high methane, tar, and ammonia conversion in
presence of 90 ppm H2S. Higher concentrations of H2S
affected conversion of methane but catalyst performance was fairly stable for
the duration of testing. Results of modeling indicated that economics of the
new process were nearly identical to the baseline CTL case, but greenhouse gas
emissions for a given production of fuels were approximately 50% lower.
KEYWORDS
Steam reforming, CTL, gasifier, syngas cleanup, Fischer-Tropsch.
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