骸炭燒成温度と其時間とに關する研究
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概要
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Coal is a non-conductor of electricity, but when carbonized to coke it becomes a conductor. In order to study the progress of the carbonization of coal, the authors attempted to measure the electrical resistance of coal briquette during the carbonization. Five kinds of coal were selected as the samples of this study, four of them being representative Japanese coking coals, the other a Chinese one. The briquettes for this examination were prepared at a pressure of 600 kilos per sq. cm., the size being 1 cm. in diameter and about 3 cm. in length. In order to measure the electrical resistance Kirchhoff's bridge arranged with cell and mirror galvanometer was employed. When the samples were heated, the galvanometer began to move at about 500°in the cases of all samples, and this temperature indicates the transition from coal to coke. As the temperature rose above 500°, the electrical resistance was recorded every one or five minutes. Results thus obtained described almost a hyperbolic curve that we may express in the following equation. xy=a Where x shows the time at which the carbonization is just finished. y is the most probable final resistance at x. a is a constant (the greater "a" becomes the more rapidly the carbonization occurs and vice versa). Applying this equation we calculated the relation between temperature and time. A large nichrome rcsistance electric furnrce in which about ten kilos of coke could be obtained was prepared for the carbonization at a temperature. The same sort of coal was carbonized at a certain temperature both in this furnace and in Solvay's coke oven, and the properties, especially the crushing strength, of the two kinds of coke as above obtained were compared. In the case of coke derived from Chinese coal, even at 750°it could stand comparison with Solvay's coke. We conclude that, in order to discover the best conditions from the point of view of fuel economy and other purposes, the following steps should be taken : - first, ascertain the relation between temperature and time requisite for carbonization ; second, examine the quality of the coke obtained by the carbonization at such a temperature und within such a time.
- 社団法人日本鉄鋼協会の論文
- 1930-05-25
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