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RISS 인기검색어
- 검색키워드
- 저자 : ( Ichiro Naruse ) (검색결과 2 건)
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Fundamentals on Co-gasification Characteristics of Biomass with Coal
( Ichiro Naruse ) 경남대학교 신소재연구소 2013 신소재연구 Vol.25 No.-
Thermo-gravimetric behavior during steam co-gasification of Japanese cedar and coal was investigated. The difference between co-gasification behavior and the average gasification behavior of cedar and coal indicates two synergetic peaks. The first peak occurred between 300 °C and 550 °C while the second peak was observed above 800 °C. The first peak coincides with volatile release and therefore associated with volatile interactions while the second peak is linked with catalytic effect of alkali and alkaline earth metal (AAEM). Acid washed cellulose and Na rich lignin chemicals were used as artificial biomass components. In reference to Japanese cedar, mixture of cellulose and lignin i.e. simulated biomass, was also investigated. Co-gasification of cellulose with coal and co-gasification of lignin with coal, demonstrates contribution of volatile interactions and AAEM catalysis respectively. Morphology of partially gasified blends, shows hastened pore development and physical cracking on coal particles. Brunauer-Emmett-Teller (BET) surface area of the charred blend was lower than the average surface area for charred biomass and coal.
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( Yoko Nunome ),( Hyun Kook Park ),( Kenji Kodama ),( Yasuaki Ueki ),( Ryo Yoshiie ),( Sang Chun Lee ),( Kuniyuki Kitagawa ),( Ichiro Naruse ) 경남대학교 신소재연구소 2013 신소재연구 Vol.25 No.-
Toxic volatile organic compounds (VOCs) have serious implications for the environment and human health. An analytical method for the rapid, direct detection of VOCs without any sample pretreatment was successfully developed by combining soft plasma ionization (SPI) with time-of-flight mass spectrometry (TOFMS). The SPI source, based on Ref. 1 and re-designed for this work, is shown schematically in Fig. 1. Vapor from a liquid sample was diluted to a ratio selected in accordance with the amount of ambient air. To achieve softer ionization of VOCs by the SPI method, discharge parameters (current and pressure) were varied to determine the optimal experimental conditions. Use of ambient air as the discharge gas was the aim for practical in situ analysis. Optimal conditions for the SPI source were determined to be: sample dilution ratio, R = 0.30; discharge current, 50 mA; and ambient air pressure, 1000 Pa. All mass spectra of the the organic solvents exhibited molecular ion base peaks, which demonstrated the achievement of soft ionization by the SPI method. From these results, an ionization mechanism in the SPI-TOFMS system was suggested in which excitation of N2 would facilitate the ionization of sample molecules. It is noteworthy that the SPI-TOFMS system enabled highly soft ionization by using practical ambient air as the discharge gas rather than cylinder gas. Therefore, this SPI-TOFMS system was validated and was well suited for the in situ on-line monitoring of VOCs. Further work will be necessary to evaluate quantification methods for the accuracy and reproducibility of our measurements.
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