Abstract
In order to investigate the influence of pressure on caking property of coal, a high pressure Gieseler plastometer was produced and fluidity of Akabira coal was examined under various pressure of Ar atmosphere.Characteristic form of fluidity curve of Akabira coal was essentially unchanged. Maximum fluidity was 1500DDPM at ambient atmosphere and it increased with pressure at first and reached to 45000DDPM at 10kg/cm2G. At higher pressures than 10kg/cm2G it decreased with pressure toward the point of 5000DDPM at 50kgjcm2G.A softning and a maximum fluid temperature fell both slightly and a solidifica-tion temperature rose gradually by ca. 10° as pressure increased from 0 to 50kg/cm2G.Change in fluidity curve after rapid pressurization from 0 to 10kg/cm2G was examined precisely as a function of the temperature of pressurization. Below 410°C the fluidity curve, obtained after the pressurization, followed the curve measured at 10kg/ cm2G, but above this temperature the former curve differd from the latter and the maximum fluidity in the former dropped with the temperature of rapid pressurization.The fluidity measurement was also carried out under reduced pressures. Maximum fluidity decreased from 1500 to 30DDPM as pressure was lowered from 760 to 20 torr.
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