Journal
BIORESOURCE TECHNOLOGY
Volume 314, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.123756
Keywords
Syngas production; Microwave-assisted pyrolysis; Continuous system; Energy balance analysis; Tar removal
Funding
- Xcel energy [RD4-1]
- Minnesota Environment and Natural Resources Trust Fund by the Legislative-Citizen Commission on Minnesota Resources (LCCMR)
- Center for Biorefining
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In light of the knowledge gap in the scale-up of microwave-assisted pyrolysis technology, this study developed a continuous microwave-assisted pyrolysis (CMAP) system and examined its feasibility for syngas production. Wood pellets were pyrolyzed in the system under various temperatures, and the product distribution and energy efficiency were investigated. At a processing temperature of 800 degrees C, the CMAP system obtained a high quality producer gas (lower heating value 18.0 MJ/Nm(3) and a 67 vol% syngas content) at a yield of 72.2 wt% or 0.80 Nm(3)/kg d.a.f. wood, outperforming several conventional pyrolysis processes probably due to two factors: 1) reactions between primary tar and biochar enhanced by microwave irradiation, and 2) the absence of carrier gas in the process. Energy efficiency of the process was also assessed. Potentially the electricity consumption could be reduced from 7.2 MJ to 3.45 MJ per kg of wood, enabling net electricity production from the process.
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