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A high-temperature gas-solid reaction device was used to simulate the gasification of coke in a hydrogen-rich blast furnace, with the gasification reaction of water/anhydrous bulk cokes studied. CO 2  and H 2 O effects on coke gasification kinetics were analyzed in CO 2 -N 2 -H 2 O and CO 2 -N 2  with the experimental temperature of 1173–1523 K, the CO 2  content of 15–60%, and the H 2 O content of 15%. Compared with those of CO 2 -N 2 , the gasification reaction rate and carbon conversion rate of cokes in the CO 2 -N 2 -H 2 O mixture were significantly higher. Carbon conversion rates of the CO 2 -N 2 -H 2 O mixture at different temperatures were about 30% higher than those of CO 2 -N 2  on average, and the gasification reaction rate was about 50% higher on average. There were two temperature regions for gasifying cokes in CO 2 -N 2 -H 2 O and CO 2 -N 2  mixtures. At 1,273 K, the gasification reaction is transformed into diffusion control, which is from chemical reaction control. The aggravation of coke gasification by H 2 O generated after hydrogen reduction of iron ores was mainly reflected at the lower temperature. Besides, the kinetic model analysis showed that random pore model was optimal in describing the gasification reaction of cokes in CO 2 -N 2 -H 2 O and CO 2 -N 2 , and the addition of H 2 O improved the gasification reaction’s activation energy.

Gasification and kinetic study on metallurgical cokes in CO 2 -N 2 -H 2 O and CO 2 -N 2 atmosphere