Slow pyrolysis of rice straw: Analysis of products properties, carbon and energy yields

Jinje Park, Yongwoon Lee, Changkook Ryu, Young Kwon Park

Research output: Contribution to journalArticlepeer-review

242 Scopus citations

Abstract

Among many uses of rice straw, application of its biochar from pyrolysis to the soil is receiving greater interest for increased crop productivity and sequestration of CO2. This study investigated slow pyrolysis of rice straw at 300-700°C to characterize the yields and detailed composition of the biochar, bio-oil and non-condensable gases. Biochar was analyzed for pH, microscopic surface area and pore volume distribution. Although the mass yield for the organic fraction was only about 25% above 500°C, biochar was the primary product of pyrolysis containing 40% of energy and 45% of carbon from the straw. The utilization of by-products (bio-oil and gases) as energy resources was essential, since the sum of energy yield was about 60%. The gases could be burned to produce the heat for an auto-thermal pyrolysis process, but the heat balance was significantly influenced by the moisture content of the raw material.

Original languageEnglish
Pages (from-to)63-70
Number of pages8
JournalBioresource Technology
Volume155
DOIs
StatePublished - Mar 2014

Keywords

  • Biochar
  • Carbon yield
  • Energy yield
  • Rice straw
  • Slow pyrolysis

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