Exergetic life cycle assessment of new waste aluminium treatment system with co-production of pressurized hydrogen and aluminium hydroxide

Takehito Hiraki, Tomohiro Akiyama

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

A new system is proposed for the treatment of waste aluminium. The total exergy loss (EXL) in the system for the co-production of 1 kg of hydrogen at 30 MPa and 26 kg of aluminium hydroxide is evaluated from the viewpoint of life cycle assessment (LCA) by comparison with the EXLs in conventional systems. The exergy flow diagram reveals that the exergy of waste aluminium, which contains only 15 mass% metal, is still large, while that of pure aluminium hydroxide is relatively small. Therefore, the EXL in the proposed system (150.9 MJ) is 55% less than that in the conventional system (337.7 MJ) in which the gas compressor and production of aluminium hydroxide consume significantly more exergy. The results also indicate that exergy analysis should be applied to the LCA as a critical measure for practical use, in addition to the conventional LCA of carbon dioxide emission.

Original languageEnglish
Pages (from-to)153-161
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume34
Issue number1
DOIs
Publication statusPublished - 2009 Jan 1
Externally publishedYes

Keywords

  • Aluminium hydroxide
  • Co-production
  • Exergy
  • High-pressure hydrogen
  • Hydrogen
  • Life cycle assessment
  • Waste aluminium

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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