Abstract
The coal-pyrolysis experiment in high pressure conditions using a pressurized thermobalance has been carried out to clarify the mechanisms and processes at conditions changing from normal pressure to higher pressure (10.6ata). Simultaneously, a new pyrolysis model which can describe a pressure effect on the evolution behavior has been developed based on the FLASHCHAIN^[○!R]model including a quantitative estimation of the volatilized gases and released tar vapor. From the experiment, the gas yields of CH_4 and CO show increasing behavior at higher pressure conditions (Ar). At higher pressure condition the the tar vapor formation is suppressed, then the recombination reactions of remainning metaplast are activated, resulting in more intermediate chars and more gas formations. It is also found that the effect of oxygen concentration on the reaction rate in low temperature range is stronger than that in high temperature range.
