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| Ikuo WATANABE Section Chief | |
| Dept. Community Environmental Sciences, | |
| National Institute of Public Health, Ministry of Health and Welfare. | |
| 4-6-1, Shirokanedai, Minato-ku, Tokyo, 108 Japan | |
| Tel +81-3-3441-7111(Ext.325), Fax +81-3-3446-4314 | |
| E-mail; watanabe@iph.go.jp |
14,178,000 Yen
(FY 1999; 4,765,000 Yen}
The evaluation systems of flue gas components from the combustion of coal briquette or charcoal in cooking stoves were developed. The emission factors (EF) of SO2, CO, NOx and CH4 were calculated from the combustion tests of coal briquette using at some cities in China and in Japan. EFs of CO from the briquette combustion were 40-150 mg/g-fuel, which is extremely high compared to 2-3 ug/g for coal combustion in power plants. The EF of SO2 for the briquette in Chongqing district, of which the S content is 2.6%, is 59 mg/g-fuel. The SO2 emission factors for others were similar and comparatively low (0.9-15 mg/g-fuel). EFs of NOx and CH4 are 0.4-2.6 and 0.4-6.2 mg/g-fuel, respectively.
The emission of CO could be reduced to below 20% by putting of a ceramic disk above the briquette with2-3 cm space. For reduction of SO2 emission, we tried three techniques, that is, (a); putting lime layer on mesh [or (b); a lime disk] above briquette with ca. 1 cm space, (c); adding lime powder to coal powder and mixing to form a flat-ball of briquette. The results shows that (c) is most effective and the reduction rate of SO2 emission was more than 85% with 5-10%(w/w) lime addition, (a) is second and the rate was 45-60%, and (b) did not show obvious reduction effect.
control technology, stove, domestic uses, coal, briquette, flue, China