Steam gasification of rapeseed, wood, sewage sludge and miscanthus biochars for the production of a hydrogen-rich syngas

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Abstract

Steam gasification of biochars has emerged as a promising method for generating syngas that is rich in hydrogen. In this study four biochars formed via intermediate pyrolysis (wood pellet, sewage sludge, rapeseed and miscanthus) were gasified in a quartz tubular reactor using steam. The dynamic behaviour of the process and effects of temperature, steam flow and particle size were studied. The results show that increases in both steam flow and temperature significantly increase the dry gas yield and carbon conversion, but hydrogen volume fraction decreases at higher temperatures whilst particle size has little effect on gaseous composition. The highest volume fraction of hydrogen, 58.7%, was obtained at 750 °C from the rapeseed biochar.

Details

Original languageEnglish
Pages (from-to)276-286
JournalBiomass and Bioenergy
Volume69
Early online date20 Aug 2014
Publication statusPublished - 1 Oct 2014

Keywords

  • Biochar steam gasification, Intermediate pyrolysis, Brassicanapus, Sewage sludge, Miscanthus x giganteus, Pinussylvestris – Piceasitchensis