Determination of the Moisture-holding Capacity of Japanese Coals

概要

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Moisture-holding capacity of approximately one hundred and twenty high volatile coals in Japan was determined. The moisture-holding capacity ranged from 1.2 to 45%, and the calorific value (m.a.f.) from 8, 630 to 3, 300kcal/kg. The coals were then classified according to the International Classification of Hard Coals by Type (E.C.E.) and the Classification of Coals by Rank (A.S.T.M.). These classification systems were of better applicability also in Japanese coals of high moisture content than those based on dry ash free basis, because of less overlapping among these coals. The lignitic coals named commonly"Atan"note 1) in Japan fell under the Class IV (Lignitic) of the ASTM syrtem. When the international system of E.C.E.was applied, the coals in Tempoku coal field note 2) and some coals of the lowest rauk in Joban coal field note 3), as well as "Mans", fell under Lignites/Brown Coals. note 1) "Atan"is a Japanese word suitable to be called as"Sub-coal".These coals have been distinguished administratively and customarily from the usual coals in our country. note 2), note 3) These are regarded as the usual coals.
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