Abstract: This paper studies the changes in the thermal properties of coke under different reaction temperatures，different gas flow rates，different gas compositions, and different melting loss rates. It is found that the main reaction of coke is infiltration at 1 100 ℃. The thermal strength tends to decrease with the increase of melting loss rate. Changes in gas composition and gas flow have little effect on heat intensity. At 1 200 ℃，the reaction of coke is mainly infiltration, accompanied by a certain degree of surface reaction. The thermal intensity first tends to decrease as the burning loss rate increases and decreases sharply when the burning loss rate is greater than 25%. After the CO2 proportion is greater than or equal to 25%， changes in gas composition and gas flow rate have little effect on thermal strength. At 1 350 ℃，surface reaction is dominant. The thermal intensity does not change much with the increase of the burning loss rate, and can always maintain at a high thermal intensity. As the CO2 ratio increases，the thermal intensity of the coke tends to decrease, and changes in gas flow rate have little effect on the thermal intensity.

Key words: Coke, High temperature thermal properties, Reaction temperature, Gas flow, Gas composition, Burning loss rate