The ther mal prop er ties of four bi tu mi nous coals were stud ied us ing iso ther mal and tem per a ture-pro grammed cal o rim e ters, such as a dif fer en tial ther mal anal y sis, a heat flux cal o rim e ter C80 and an ther mal ac tiv ity mon i tor (TAM-III). The cor respond ing spon ta ne ous ig ni tion was mea sured in an adi a batic spon ta ne ous ig ni tion tester. It was found that there were weak exo ther mic ac tiv i ties in bi tu mi nous coal at 50-100 °C and mean while car bon mon

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... x ide and car bon di ox ide was gen er ated. These ther mal be hav iors are re spon si ble for the self heating from 50 °C and spontaneous ignition at 80 °C.