Pilot-Plant Scale 12 kW Microwave Irradiation Reactor for Woody Biomass Pretreatment

Naoki HASEGAWA  Tomohiko MITANI  Naoki SHINOHARA  Masakazu DAIDAI  Yoko KATSURA  Hisayuki SEGO  Takashi WATANABE  

IEICE TRANSACTIONS on Electronics   Vol.E97-C    No.10    pp.986-993
Publication Date: 2014/10/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E97.C.986
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Microwave and Millimeter-wave Technologies)
Microwave heating,  permittivity measurement,  finite element method,  magnetron,  

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A simple, low reflection, and highly-efficient pilot-plant scale microwave irradiation reactor for woody biomass pretreatment was fabricated. Pretreatment is an essential process for effective bioethanol production. The fabricated reactor consists of 8 microwave irradiators which are attached to a metal pipe. The woody biomass mixture which contains water and organic acid flows through the metal pipe and is heated by microwaves at a total power of 12 kW. To design the microwave irradiators, we used a 3D Finite Element Method (FEM) simulator, which was based on the measured complex permittivity data of the woody biomass mixture. The simulation results showed that the reflection coefficient |S11| from the reactor was less than -30 dB when the woody biomass mixture temperature was between 30°C and 90°C. Finally, we experimentally confirmed that the fabricated irradiation reactor yielded a microwave absorption efficiency of 79%.