資源・素材 & EARTH 2017(札幌)

講演情報(2017年8月24日付)

EARTHポスター発表(Poster:EARTH)

EARTHポスター発表(Poster:EARTH)

2017年9月26日(火) 15:30 〜 17:30 ポスター会場1 セミナー室・ホワイエ (フロンティア棟2F/Fl. 2.,Build.Frontier, Seminar Room2 & Foyer)

15:30 〜 17:30

[PE1-057] Plasma desulfurization of an underground coal gasification gas

○Kazuhiro Takahashi1, Kohki Satoh1, Ken-ichi Itakura1 (1. Muroran Institute of Technology)

キーワード:Underground coal gasification, Hydrogen sulfide, Desulfurization, Discharge plasma

An artificial underground coal gasification (UCG) gas, the mixture ratio of which is (N2+CH4)/CO2/H2/H2S = 64.7/20.0/15.0/0.3-0.35%, is decomposed using a packed-bed dielectric barrier discharge (PB-DBD), the by-products of the UCG gas are measured by infrared absorption spectroscopy (IRAS), gas chromatography (GC) and gas chromatography mass spectrometry (GCMS), and then the desulfurization characteristics of the UCG gas are investigated. A PB-DBD reactor consists of a glass tube filled with dielectric fillings, an inner rod and an outer mesh electrodes. Soda-lime glass balls and activated alumina (Al2O3) balls are used as the dielectric fillings. The artificial UCG gas is fed into the reactors at a constant flow rate of 0.5 L/min, and a high-voltage generated by a neon transformer is applied to the electrodes, generating a PB-DBD. It is found that H2S in the UCG gas is selectively decomposed by the PB-DBD without H2 decomposition. The decomposition rate of H2S in the UCG gas without CH4 using the PB-DBD reactor filled with Al2O3 balls is approximately 1.9 times higher than that using one filled with glass balls, however, the decomposition rates of H2S decrease with the increase of CH4 content, and these become almost the same at the CH4 content of more than 30%. It is also found that CO, COS, and CS2 are produced as by-products during the plasma desulfurization, and that CH3SH, C2H5SH, (CH3)S, CH3SC2H5, and (CH3S)2 are produced only when CH4 is contained in the UCG gas. Furthermore, SO2 is detected in the PB-DBD reactor filled with glass balls by IRAS and GCMS, while not detected in one filled with Al2O3 balls due to the adsorption of SO2 on the surface of Al2O3.

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