Ceremony
发表于 2025-3-23 10:08:09
How much Coal?7 World Energy Conference data to indicate that the geological resources exceed 10 000 x 10. tons of coal equivalent (TCE), compared with a production in 1975 of 2.6 x 10. TCE, i. e. several thousand years supply at present rates of consumption. On the other hand, in the 1977 Robens Coal Science Lec
缝纫
发表于 2025-3-23 15:30:31
How is Coal Won? this book. However, some slight familiarity with the general principles of getting coal is a desirable adjunct to a consideration of coal utilisation. It is obvious that the quality of the coal, and therefore its suitability for various uses, can be directly affected by the mining techniques employ
使残废
发表于 2025-3-23 20:47:01
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一致性
发表于 2025-3-24 02:00:30
The Carbonisation of Coaliles are higher in hydrogen content than the basic coal, which therefore increases in carbon — hence, “carbonization”. As noted elsewhere, the off-gases can be useful; fuel gases and chemical feedstocks, especially benzene, can be separated. Carbonisation processes in the past sometimes had the prod
恭维
发表于 2025-3-24 03:08:46
Gasification consumed in the future, as at certain periods of the past, will first be converted into gases. Motivations for this conversion may include (a) the greater convenience of gaseous fuels compared with solids, (b) the possibility of beneficial changes in environmental impact and (c) possible improvemen
形状
发表于 2025-3-24 08:35:42
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时间等
发表于 2025-3-24 12:34:42
Chemicals from Coalmain feedstocks for the chemicals industry at present are natural gas, liquefied petroleum gases (.) and light petroleum distillates, especially naphtha. Direct substitutes for all these can be made from coal, as indicated elsewhere; it would, in fact, be possible merely to follow this line and to p
半导体
发表于 2025-3-24 17:09:03
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相一致
发表于 2025-3-24 21:56:34
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陪审团
发表于 2025-3-25 02:30:18
Economics of Combustion and Power Generationhas been the generation of electricity. This pattern will not change quickly and to many observers, the question of the future role of coal in the medium term is equated with its competitiveness in the electricity generation field. In the longer term — and perhaps sooner than many experts might agre