- Title
- Hydrogen production from ventilation air methane in a dual-loop chemical looping process
- Creator
- Zhang, Yongxing; Doroodchi, Elham; Moghtaderi, Behdad; Han, Xiaojuan; Liu, Yushan
- Relation
- Energy & Fuels Vol. 30, Issue 5, p. 4372-4380
- Publisher Link
- http://dx.doi.org/10.1021/acs.energyfuels.6b00134
- Publisher
- American Chemical Society
- Resource Type
- journal article
- Date
- 2016
- Description
- A dual-loop chemical looping process is proposed to produce hydrogen from ventilation air methane (VAM). It mainly consists of two loops, an oxygen removal loop and a hydrogen production loop. The oxygen removal loop is a Cu-based chemical looping air separation process, in which the oxygen content is separated through the reversible reaction 4CuO ⇄ 2Cu₂O + O₂ + 263.2 kJ/mol.The oxygen-depleted stream is subsequently fed into the hydrogen production loop, where the ultra-low-concentration methane is reformed into highly pure hydrogen. In light of the thermodynamics and experimental results, the oxygen removal temperature should be in the range of 300–400 °C in order to commence the oxidation of Cu₂O at a proper kinetics rate while the catalytic combustion of VAM and reduction of copper oxides with methane are inhibited. Two configurations are proposed, and the thermodynamic performance is evaluated by a case study with methane concentration of 0.5 vol%. It was found that the proposed system was able to produce high-purity hydrogen from VAM, and the hydrogen efficiency was as high as 40.4%. If pure O₂ is considered as a byproduct, the energy demand was 0.32 kWh/m³ O₂, which is significantly lower than the energy demand of conventional cryogenic systems. In addition, a parametric study was conducted to determine the effect of the varying operational parameters, and hence the most suitable values for the parameters are given.
- Subject
- hydrogen production; ventilation air methane; dual-loop chemical looping process; O₂; Cu₂O
- Identifier
- http://hdl.handle.net/1959.13/1324073
- Identifier
- uon:24953
- Identifier
- ISSN:0887-0624
- Language
- eng
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