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  

Publication
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)
Category: 
Keyword: 
Microwave heating,  permittivity measurement,  finite element method,  magnetron,  

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Summary: 
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%.