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 (584Kb)
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21,250,000 Yen (FY1994 4,781,000 Yen)
The Source inventory of methane(CH4) and nitrous oxide(N2O) from industrial activities are studied. Coal mines in Japan have routine monitoring system for CH4 contents based on the mining safety law. The emission factors of CH4 from coal mines in Japan are ranging between 12 to 116 m3 per ton of coal production. The average emission factor is 27 m3/ton. The annual total amount of CH4 emission from coal mines in Japan is 0.22 Tg at 1989 fiscal year statistics and 0.15 TgCH4 was discharged into atmosphere. CH4 emission from Chinese coal mines was estimated by using emission factors based upon the data of Japanese coal mines and Chinese statistical data. Total coal product in China is 1,138 Mton in 1993 and 8.8 Tg of methane is estimated to discharged into atmosphere due to the coal mining.
A recent study on the contribution of the combustion of fossil fuels has shown that the earlier results are incorrect because N2O was being artificially produced in the flask. The latest estimation of the global flux of N2O from combustion sources is between 0.1 and 0.3 Tg-N per year. Updated estimation of annual nitrous oxide emissions from fossil fuel combustion in Japan shows that the total N2O emission from coal, oil and natural gas is 2.6 Gg-N in conventional combustors and 2.3 Gg-N in fluidized bed combustors. The annual N2O emission from power plants in Japan was estimated as 1 Gg-N/year by latest data of power plants.
Total annual emission of N2O from fossil fuel combustion in China was estimated as 12 Gg-N on the assumption that 3% of coal is burned by fluidized bed combustion. Global annual N2O emission from coal combustion was estimate as 90-210 Gg-N from world's annual coal consumption.
Industrial Facilities, Methane, Coal mining, Nitrous Oxide, Combustion