44.自然発熱がもたらす石炭性状劣化に関する検討

抄録

Coal in air is oxidized little by little and generates heat. As soon as being stacked, temperature starts to rise inside the large-scale stockpile. In the past study we measured the temperature of subbituminous coal stockpile which showed the selif-heating rate of 2℃/d or more. Spontaneous heating brings not only the darmage of facilities and environment but deterioration of the coal. It is important to determine the coal deterioration for efficient stockpile management and optimization of the integrated cost of coal use. In this study, some methods to determine the coal deterioration derived from spontaneous heating were examined. Heat loss by spontaneous heating of 5,000t stockpile was estimated. In the loboratory 3 different ranking coals which were sampled from large-scale reactor were analyzed to compare to the original ones.