石炭の堆積層の蓄熱性について (第3報)

Abstract

The purpose of this study is the investigation of the spontaneous ignition phenomenon in the wet coal pile by using the special furnace.The experiments yield the following results.1) If the ventilation passes by the ignition source, there exists the definite relation between the temperature directly measured at the exhaust of the wet coal pile and the temperature of the ignition source. Thus, calculating the entalpy of air at the observing point, we can anticipate the condition as well as the temperature of the ignition source.2) In the case of the wet coal pile, the heat created by the spontaneous ignition is absorbed by the moisture in the vapour saturated air so as to keep the temperature of the wet coal pile lower and to delay the propagation of the high temperature region from the ignition source. Therefore, we can say the wet condition of the coal pile is desirable in order to prevent the spontaneous ignition.3) However, if the spontaneous ignition occurs in the wet coal pile, it takes longer time to cool it down by sealing because the vapour in the air has excess entalpy, which stores more heat, than the dry pile.