石炭加熱過程に於ける軟化熔融性について

Abstract

For the testing methods of the plastic state of coal, there are Shefield Laboratory Test, K.B.S.-method and Tadokoro's method etc. Authors modified the K.B.S.-apparatus to obtain softening-swelling curve and gas evolution curve simultaneously. The samples used were of various ranks of coals (fuel ratio 0.5-5.0) in Japan. By the obtained softening-swelling curves, all samples were classified in three types, non-softening type, softening type, and softening-swelling type. Lignite or low rank coal and anthracite belonged to non-softening type, and were not caking. Bituminous coal belonged to the second or third type, and the fuel ratio range of softening type coals was between 1 and 3, and that of softening-swelling type coals was between 0.5 and 2.5 The critical points of these curves, softening temperature, maximum swelling temperature and temperature of maximum gas evolution rate, etc., were closely referred to the fuel ratio of coal samples. The effects of size of coal and load on coal charge were examined with typical samples of each type, but no distinct conclusion was obtained. About artificial coals (prepared from cellulose, lignin, protein and their mixture in the medium of H2O or N/10 NaOH) were also examined, but it was difficult to compare artificial coals with natural coals by softening-swelling curve, owing to the difference of physical conditions.