Coal is the largest source of energy for electricity generation in the world, at the same time, one of the largest anthropogenic sources of carbon oxides and other greenhouse gases released into the atmosphere. Coal gasification has emerged as a cleaner technology for producing fuel gases for electricity and heat generation, thereby reducing carbon dioxide emissions. The effect of operating conditions (temperature and pressure) on the gasification rate of charcoal is very important with regard to design. and the operation of a coal gasifier. It is obvious that the rate of the coal-coal gasification reaction depends on the operating conditions, which are studied using the ashless (unreacted) shrinking spherical particle model. The gasification rate of charcoal increases with increasing temperature and partial pressure of CO2, but the total system pressure shows a negative effect on charcoal conversion.Keywords: Coal gasification, model shrink coreINTRODUCTIONThe reaction of carbon with CO2 is important in a variety of applications, including the generation of electricity by coal gasification and the smelting of iron and steel. Since several commercial gasifiers for IGCC operate at high temperature and high pressure (1200-1600°C, 2.5 MPa). In the existing literature, information on the gasification characteristics of coal at atmospheric pressure can be found [1-3]. However, only a few fundamental studies on the reactivity of coal gasification at high temperature and high pressure have been reported [4–7]. Coal gasification involves two main reactions: coal pyrolysis and coal gasification. Since the rate of carbonization is much slower than that of devolatilization, the gasification characteristics o...... middle of paper ......on the X data as a function of time at a reaction temperature of 1300 0C , a total pressure of 1 MPa.3. CONCLUSIONSThe gasification kinetics of an Indonesian subbituminous charcoal with CO2 is studied using an unreacted shrinking core model. The following results are obtained. The gasification rate depends on the total pressure, temperature and partial pressure of the gasifying agents. The conversion fraction of charcoal will decrease with increasing total pressure from 0.5 to 1.5 MPa at constant and partial temperature. pressure of the gasification agent. The conversion fraction of charcoal will increase by increasing the temperature from 900 to 1400°C at constant total pressure and constant partial pressure of the gas. The conversion fraction of charcoal will also increase by increasing the partial pressure of gasifier from 0.2 to 0.5 MPa at constant total pressure and temperature.