In this paper, a coke dry quenching gasification (CDQG) technology using coke oven gas (COG) and steam to quench the incandescent coke is proposed. The distinct advantages of this technology include energy conservation, pollution reduction, and improvement of coke quality and full use of resources. Based on Gibbs free energy minimization principle, the flow rate and composition of the syngas could be calculated. At the same time, the impact of the flow rate of the COG on the flow rate and composition of the syngas and the exergy efficiency are analyzed. Finally, the flow rate of the COG is prudently chosen to make thermodynamic analysis of the process.