Shigeru Ikai

Research on the Combustion of Low Grade Pulverised Coal

Burning characteristics of an extremely high ash coal, of which the calorific value is about 2000 kcal/kg, was tested by pulverized fuel combustion with a dry system. A special test furnace was designed which would be most adequate for the combustion of such a high ash coal. From the test, results obtained are as follows : 1) High combustion rate can be expected even from shales of 65∼75% ash, with high combustion efficiency. 2) To get stable combustion of low grade coal in a dry system, the furnace wall temperature must be kept in an adequate range, 750∼1100°C.

Grindability of Coal

筆者等は石炭の粒度分布を良く示す式として外国炭に就て報ぜられて居るP.RosinE篩目巾xの飾にて節つた時の筋上重量%, n, 6;常数なる式が本邦炭に亀何の程度適用し得るかを先づ検討し, 次に粉碎機としてBall millを用いた際各種の粉碎條件に応じ, 又炭種及び炭化慶の差に応じて常数n, bが如何に変化するかを実験的に求め, 更に現在石炭の粉碎性の表示法として用いられて居るA.S.T.M.のBall mill法, J.E.S.落下試験法, 回転試験法, 、Hardgrove法等は如何なる意味の竜のであるかを考察した。