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Minami-rinkan, Japan

Wada Y.,Chugoku Electric Power Co. | Oyama K.,Chugoku Electric Power Co. | Yamasaki T.,Chugoku Electric Power Co. | Uchiyama I.,Chugoku Electric Power Co. | And 6 more authors.
Nihon Enerugi Gakkaishi/Journal of the Japan Institute of Energy | Year: 2013

The operation of a 1 t-wet/d supercritical water gasification plant was evaluated for the gasification of barley shochu residues with activated carbon charges ranging from 0 to 0.05 kg/kg-slurry. Activated carbon concentrations greater than 0.025 kg/kg-slurry were found to prevent plugging by tarry residues. The pressure loss for the effluent that flowed in the annulus of the double-tube heat exchanger did not exceed 0.2 MPa. Long continuous operation times of 17 h 48 min were possible with an activated carbon charge of 0.025 kg/kg-slurry. Activated carbon is not only effective for prevention of plugging, but also effective for reduction in total organic carbon and enhancement of carbon gasification efficiency. An economic evaluation showed that the process can be viable when operated for more than 200 d per year.


Matsumura Y.,Hiroshima University | Hara S.,Hiroshima University | Kaminaka K.,Hiroshima University | Yamashita Y.,Hiroshima University | And 6 more authors.
Journal of the Japan Petroleum Institute | Year: 2013

Supercritical water gasification is expected to be an effective gasification process for wet biomass, but its reaction kinetics has not been elucidated for actual biomass feedstocks. In this study, seven biomass species are gasified in a supercritical water gasification reactor with and without use of a suspended activated carbon catalyst, and the overall gasification rates are determined. The feedstocks can be classified into three groups depending on the gasification characteristics. Representative gasification-rate parameters are presented. The homogeneous reaction had a pre-exponential factor of 50.0 s -1 and an activation energy of 67.9 kJ/mol. The heterogeneous reaction for feedstocks with high cellulose content had a pre-exponential factor of 4.87×109 s-1 and an activation energy of 161 kJ/mol, while, feedstocks with low cellulose content had a pre-exponential factor of 1.91× 104 s-1 and an activation energy of 84.2 kJ/mol.


Matsumura Y.,Hiroshima University | Yamashita Y.,Hiroshima University | Inoue S.,Hiroshima University | Kawai Y.,Chuden Plant Co. | And 3 more authors.
10AIChE - 2010 AIChE Annual Meeting, Conference Proceedings | Year: 2010

Supercritical water gasification is a promising technology for the effective use of wet biomass including manures, food wastes, and sewage sludge. The authors have shown that the reaction kinetics in supercritical water gasification with and without activated carbon catalyst can be experessed using Arrhenius type first-order reaction rate. In this study, the reaction paremeters for various biomass species including chicken manure, swine manure, cattle maure, soy-bean hydrogen fermentation residue, food waste hydorgen fermentation residue, waste grass, and seaweed ethanol fermentation residue were determined, and compared. The result showed that the bioamss species can be categorized into some groups in terms of its reactivity in supercritical water and the effect of activated carbon catalyst.


Horiguchi N.,Hiroshima University | Inoue S.,Hiroshima University | Kawai Y.,Chuden Plant Co. | Noguchi T.,Toyo Koatasu Co. | And 3 more authors.
Nihon Enerugi Gakkaishi/Journal of the Japan Institute of Energy | Year: 2013

The heat transfer characterisitcs of activated carbon suspended slurry near the critical point of water was determined experimentally using a double pipe heat exchanger. The preliminary experiment to mea sure the heat transfer coefficient of water showed the value predicted by the previous study. There is hardly any effect of activated carbon addition and change of its concentration. This result suggests that heat transfer of biomass slurry with suspended catalyst powders near the critical point of water can be estimated using the heat transfer characteristics of water, which is of practical importance.


Noguchi T.,Toyo Koatasu Co. | Noda Y.,Toyo Koatasu Co. | Yamasaki Y.,Hiroshima University | Inoue S.,Hiroshima University | And 4 more authors.
Nihon Enerugi Gakkaishi/Journal of the Japan Institute of Energy | Year: 2011

Supercritical water gasification is a promising technology to recover energy from wet waste biomass feedstock. To properly design the supercritical water gasification plant, heat transfer characteristics of the heating section is essential. Although the supercritical water has been an object of study for a long time, report on heat transfer characteristics of the flowing biomass slurry feedstock is limited. The purpose of this study is to measure heat transfer characteristics of biomass slurry flowing in the tube. Heat transfer characteristics of the biomass slurry was measured experimentally and correlation was made to predict the heat transfer characteristics. The resulting is applicable only to the biomass slurry tested here, but the procedure developed in this study should be applicable to other kinds of biomass slurry.

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