貯炭層の温度變化に就て
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概要
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This investigation was carried out at the Yawata Iron Works to make clear the temperature change of stored coal. It was conducted in September 1924, the coal samples employed being Shishimachi and Shisen. The total height of the coal pile was kept at 3.8 meters. The point at which the temperatures were measured was at the center of the pile, at the depth of 1.0, 1.5, 2.0, 2.5, 3.0 and 3.5 meters vertically from the ground. Shishimachi and Sisen coal gave diametrically opposed results, that is to say, in the latter the temperatures at the depth of 1.0, 2.0 and 3.0 meters were comparatively low, while at 1.5 and 2.5 meters they showed as high as 44℃. With the former coal the points of 1.0, 2.0 and 3.0 meters gave high temperatures, viz : 35℃., but those at 1.5 and 2.5 meters were lower compared with the above measures. The author explains those results of the temperature rise in the piled coal as being due to the heat radiation of the sun, so that there must be periodical cooling and heating of the surface. These temperature graduations penetrate step by step into the coal heap, and thus the foregoing results are to be perceived. The fact that Shisen coal is slower in temperature rise than Shishimachi, but higher in its degree, shows that the temperature rise depends not only on the heat conductivity of the coal but also on its chemical composition. And, as a matter of fact, the author proved by chemical analysis that coal low in volatile matter and high in sulphur generally shows a greater temperature change than that of high volatile and low sulphur coal. The rate of temperature rise per 100 days at a depth of 1.5 meter from the surface measured vertically with Shisen, Shishimachi and Hakusan coals, piled in the same volume and height (3.8 meters) was as follows : - Shisen, fines. 10.1℃. Shishimachi, fines. 2.7" Hakusan, fines. 5.0" From these results, it is clear that coal having a higher rate of temperature rise, as Shisen coal, should be piled as low as possible, but that of a lower rate, as Shishimachi, may be stored safely at any height of the pile. However, generally the storage submerged in water is preferable.
- 一般社団法人日本エネルギー学会の論文