Original Article

Study on deterioration behavior of coke during gasification

¹ Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, PR China
² State Key Laboratory of Metal Material for Marine Equipment and Application, Anshan, PR China
³ Ansteel Iron & Steel Research Institutes, Anshan, PR China

^* e-mail: liangc@seu.edu.cn

Received: 22 July 2023
Accepted: 23 October 2023

Abstract

The reaction temperature and time on the carbon loss of coke during CO₂ gasification were studied. The results showed that there were significant correlations among the reactivity, pulverization rate, and wear resistance. The degree of variation in pulverization rate and wear resistance revealed that coke reactivity changed dramatically as reaction temperature rose. The temperature was also the key factor for coke graphitization. The evolution of the inorganic minerals and pore wall microstructure was investigated after coke gasification. The migration and accumulation of inorganic minerals, such as mullite, calcium ferrite, and iron oxide in coke, were discovered to catalyze the deterioration of the coke pore wall, resulting in the coke powder formation. The graphitization degree of the skin layer was greater than that of the core after high-temperature reactions, which accelerated skin layer separation from the core.