Title

Thermodynamic analyses of hydrogen production from sub-quality natural gas - Part II: Steam reforming and autothermal steam reforming

Authors

Authors

C. P. Huang;A. T-Raissi

Comments

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Abbreviated Journal Title

J. Power Sources

Keywords

hydrogen; sub-quality natural gas; SMR; autothermal process; hydrogen; sulfide; carbonyl sulfide; HYDROCARBON; CARBON; Electrochemistry; Energy & Fuels

Abstract

Part I of this paper analyzed sub-quality natural gas (SQNG) pyrolysis and autothermal pyrolysis. Production of hydrogen via direct thermolysis of SQNGs produces only 2 mol of hydrogen and 1 mol of carbon per mole of methane (CH(4)). Steam reforming of SQNG (SRSQNG) could become a more effective approach because the processes produce two more moles of hydrogen via water splitting. A Gibbs reactor unit operation in the AspenPlus (TM) chemical process simulator was employed to accomplish equilibrium calculations for the SQNG + H(2)O and SQNG + H(2)O + 02 systems. The results indicate that water and oxygen inlet flow rates do not significantly affect the decomposition of hydrogen sulfide (H2S) at temperatures lower than 1000 degrees C. The major co-product of the processes is carbonyl sulfide (COS) while sulfur dimer (S(2)) and carbon disulfide (CS(2)) are minor by-products within this temperature range. At higher temperatures ( > 1300 degrees C), CS(2) and S(2) become major co-products. No sulfur dioxide (SO(2)) or sulfur trioxide (SO(3)) is formed during either SRSQNG or autothermal SRSQNG processes, indicating that no environmentally harmful acidic gases are generated. (c) 2006 Elsevier B.V. All rights reserved.

Journal Title

Journal of Power Sources

Volume

163

Issue/Number

2

Publication Date

1-1-2007

Document Type

Article; Proceedings Paper

Language

English

First Page

637

Last Page

644

WOS Identifier

WOS:000243650800003

ISSN

0378-7753

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