高揮発分の日本炭分類における包蔵水分の意義
昭和45年11月4日第7回石炭科学会議講演
1970 年 49 巻 12 号 p. 881-888
詳細
1970 年 49 巻 12 号 p. 881-888
Applicability of Calorific Value (m. a. f.) was considered to the classification of Japanese coals of high volatile content as in “International classification of hard coal by type” and in“ASTM classification of coals by rank”.
Relations between moisture-holding capacity, carbon centent, calorific value and fixed carbon were studied.
Calorific value (m. a. f.), next to carbon (m. a. f.) and carbon (d. a. f.), was found to be a sufficient classification index for these coals.
But fixed carbon (d. a. f.) was not a sufficient index, because of the irregularity that the relations of fixed carbon (d. a. f.) both to carbon (d. a. f.) and to calorific value (d. a. f.) were centrary within the coals from Johan coal field to those from other coal fields.
From the study of the relation between moisture-holding capacity (ash free) and calorific value (m. a. f.), a transition point on coal rank was found at 4.1 per cent moisture-holding capacity (ash free) and 7780 cal/g (m. a. f.).
