Hydrogen production via the iron/iron oxide looping cycle

A. Singh, F. Al-Raqom, J. Klausner, J. Petrasch

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

6 Citations (Scopus)

Abstract

The iron/iron-oxide looping cycle has the potential to produce high purity hydrogen from coal or natural gas without the need for gas phase separation: Hydrogen is produced from steam oxidation of iron or Wustite yielding primarily Magnetite; Magnetite is then reduced back to iron/Wustite using syngas (CO+H2). A system model has been developed to identify favorable operation conditions and process configurations. Process configurations for three distinct temperature ranges, (i) 500-950 K, (ii) 950-1100 K, and (iii) 1100-1200 K have been developed. The energy content of high temperature syngas from conventional coal gasifiers is sufficient to drive the looping process throughout the temperature range considered. Temperatures around 1000 K are advantageous for both the hydrogen production step and the iron oxide reduction step. Simulations of a large number of subsequent cycles indicate that quasi-steady operation is reached after approximately 5 cycles. Comparison of simulations and experiments indicate that the process is currently limited by chemical kinetics at lower temperatures. Therefore, product recirculation should be used for a scaled-up process to increase reactant residence times while maintaining sufficient fluidization velocity.

Original languageEnglish
Title of host publicationASME 2011 5th International Conference on Energy Sustainability, ES 2011
Pages1999-2008
Number of pages10
EditionPARTS A, B, AND C
DOIs
Publication statusPublished - 13 Mar 2012
Externally publishedYes
EventASME 2011 5th International Conference on Energy Sustainability, ES 2011 - Washington, United States
Duration: 7 Aug 201110 Aug 2011
Conference number: 5

Publication series

NameASME 2011 5th International Conference on Energy Sustainability, ES 2011
NumberPARTS A, B, AND C

Conference

ConferenceASME 2011 5th International Conference on Energy Sustainability, ES 2011
Abbreviated titleES 2011
CountryUnited States
CityWashington
Period7/08/1110/08/11

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