Co-gasification of petroleum coke-biomass blended char with steam at temperatures of 1173-1373 K

The co-gasification properties of petroleum coke (PC) and biomass char (BC) were investigated by isothermal thermogravimetric method under steam atmosphere. The physical and chemical structure features were also systematically tested. The high carbonaceous structure ordering, low specific surface area and ash content were the main reasons for the low reactivity of PC, and the addition of BC improved the reactivity of blended char. The synergistic effect existed and was the most obvious when the proportion of BC was 20%. Three nth-order models were used to interpret the carbon conversion data. The RPM was slightly better than that of the VM and URCM. Furthermore, the synergetic effect was also observed from the kinetics data calculated by RPM. The apparent activation energy of PC and BC gasification was 74.3 kJ/mol and 70.5 kJ/mol, whereas, the lowest value for blended char was 49.6 kJ/mol when the proportion of BC was 40%.