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Journal of the Japan Institute of Energy Vol. 78 (1999), No. 4

ISIJ International
belloff
ONLINE ISSN: 1882-6121
PRINT ISSN: 0916-8753
Publisher: The Japan Institute of Energy

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Journal of the Japan Institute of Energy Vol. 78 (1999), No. 4

Non-catalytic Oxidation of NO to NO2 by Addition of Dimethyl Ether

Junichi SATOU, Mitsuhiro OHTA, Makoto AKIYOSHI, Eiji OBATA

pp. 265-274

DOI:

10.3775/jie.78.265

Abstract

Oxidation characteristics of nitrogen monoxide (NO) to nitrogen dioxide (NO2) was studied by adding dimethyl ether to model combustion flue gases in a quartz flow reactor. The kinetic simulation model of CH3OCH3-NO-O2 system was used to investigate the mechanism of converting NO to NO2. The operating parameters are reaction temperature, the amount of DME (dimethyl ether) addition, and O2 concentration.
The oxidation of NO to NO2 by the addition of dimethyl ether occurred at the temperature range of 600-1050K in the presence of oxygen. The plots of percent of NO oxidation vs. reaction temperature indicate that there exist two optimum temperature ranges of 650-750K and 850-950K. The optimum peak at the lower temperature range (650-750K) was more susceptive to the amount of DME added and O2 concentration. However, at the highest DME amount and O2 concentration used, the NO oxidation percent was high all over the 650-950K range.
The results of the kinetic simulation show that the reaction paths of NO oxidation to NO2 by adding dimethyl ether at the low temperature range of 650-750K is different from those at the high temperature range of 850-950K.

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Non-catalytic Oxidation of NO to NO2 by Addition of Dimethyl Ether

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Atomization Characteristics of Spray-to-Spray Impinging Atomizer

Keiichi HAYASHI, Kiyoshi OHARA

pp. 275-279

DOI:

10.3775/jie.78.275

Abstract

The atomization characteristics of spray-to-spray impingement system was investigated in this study for the purpose of its prospective utilization in continuous combustion burners which are used for boilers etc. Two twin-fluid atomizers were used as impinging spray. The total spray quantity is 35 1/h at maximum. SMD was measured in various cases of QA/QW, spray quantity, impingement angle and impingement distance.
The results obtained in the experiment are as follows;
(1) The SMD after impingement reduced about 1/2, compared with that of a single spray.
(2) The optimum condition (minimum value of SMD) varied with QA/QW and spray quantity. The minimum SMD were attained in the case of the impingement angle 140 deg. and the impingement distance about 30 mm within the range of QA/QW= 0.6-1.0 and spray quantity = 21-35 1/h.

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Impact Assessment of Life Cycle Assessment

Kiyotaka WAKI

pp. 280-286

DOI:

10.3775/jie.78.280

Abstract

Matushita Electric Works has been using life cycle assessment (LCA) to estimate the environmental impact of lighting products throughout their functional life and to guide the design of environmentally conscious products. This report summarizes LCA studies on the company's high frequency lighting fixtures. LCA helped clarify product planning and development objectives, and provided a quantative comparison of the environmental impact of related products. Although development of standardized procedures and case-study databases will be required to take full advantage of LCA, the technology has already proved useful in identifying particular phases of the product life cycle where environmental impact can be reduced, and promises to contribute to the development of environmentally-conscious products.

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Impact Assessment of Life Cycle Assessment

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