貨車積石炭試料採集試驗に就て
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概要
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The method of sampling coal in railway trucks generally adopted in this country is to shovel out the sample from the surface, or from the upper, middle and lower layers of the coal. In the Bureau of Mines of the United States of America, they adopt the method of taking the sample by a ladle inserted underneath the truck when its bottom is removed. The author gives first a review of sampling methods, the amount of the sample taken, and the reducing methods and sizes. Next, he describes his method of experimenting and the results are explained. As a reducing method, he adopted that of the American Testing Materials Institute, and for sampling he used the same ladle as the Bureau of Mines have defined, but to avoid the annoyance of removing the bottom of the truck, he employed a sampling tube on the principle of the screw conveyor. To compare the sampling results thus obtained, he determined the ash content of the sample. Examples of the results obtained are given hereunder, viz : - Kind of coal sampled. Sampler. Amount of coal. Amount of sample taken. Ash content. Difference in ash content b coal, 1 Ladle for unscreened coal. 195kg. 572lbs. 15.95% 0.28% 2 Ladle for fine coal. 195kg. 192lbs. 15.66% c coal, 1 Ladle for unscreened 180kg. 528lbs. 14.28% 0.33% 2 ditto. 180kg. 528lbs. 13.95% A coal 1 Sampling tube. 210kg. 500lbs, 10.80% 0.76% 2 ditto. 210kg. 500lbs. 10.04% B coal 1 ditto. 375kg. 1000lbs. 16.53% 0.55% 2 ditto. 375kg. 1000lbs. 17.08% Again, with certain coal he compared directly the tube and the ladle as samplers, and the following results were obtained, viz : - Sampler. Amount of coal. Amount of sample taken. Ash content. Difference in ash content. Tube 105kg. 300lbs. 14.15% 0.18% Ladle 105kg. 300lbs. 14.34% Thus it is clear that the sampling tube proposed by the author can be compared favourably with the ladle. Furthermore, its manipulation is very simple, if the coal to be sampled is not unscreened coal of large size.
- 一般社団法人日本エネルギー学会の論文