Continuous flame oxidation in supercritical water |
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| Authors: | Hirokazu Sato Shusaku Hamada Roberto M. Sertkawa Tatsuya Nishimura Takashi Usui Hideo Sekino |
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| Affiliation: | 1. Center for Advanced Technology , Ebara Research Co. Ltd., 4-2-1 Honfujisawa, Fujisawa, 251-8502, Japan;2. Environmental Engineering Group, EBARA Corporation , 1-6-27 Kohnan, Minato-ku, Tokyo, 108-8480, Japan |
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| Abstract: | Abstract Continuous flames have been observed in Supercritical water oxidation (scWO) of isopropyl alcohol (IPA), using a vertical continuous reactor with sapphire windows and a mixing nozzle. Two types of continuous flame were confirmed: the one was long pale blue colored and the other was red short cone shaped, changing blue to red at around air ratio 2.0. The flame was strongly influenced by IPA concentration, air ratio and design of the mixing nozzle. Results for decomposition of PA are presented for IPA concentrations ranging from 600 up to 28260 ppm as TOC and initial reactor temperatures, were mostly around 490°C, at 25 MPa. Decomposition rate at steady state was over 99.9%. Experimentally measured CO2 and O2 concentrations at the flue gas were in good agreement with theoretically calculated values. Even for low air ratio as 1.1, high decomposition rate without CO, NO, NO2 was achieved. |
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| Keywords: | Supercritical water Continuous flame Sapphire windows Mixing nozzle In situ observation Low air ratio |
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