Degradation Behavior of Coke Reacting with H₂O and CO₂ at High Temperature

Abstract

The degradation behaviors of coke which reacts with CO₂ and H₂O were explored in self-made gas-solid reacting apparatus. It was observed that the temperature loss of coke with H₂O in initial and violent solution were about 37°C and 125°C lower than that with CO₂ respectively. The gasification rate of coke with H₂O was about 1.27–3.16 times faster than that with CO₂. But the difference of gasification rate will reduce with the lower temperature. The coke strength after reaction (CSR) with H₂O was lower than with CO₂ at 950°C–1100°C, but higher at 1200°C. The coke’s apparent porosity and changing rate after reacting were both smaller with H₂O than with CO₂. It is mainly due to the reaction that occurred closer to the coke particle surface with H₂O than with CO₂.