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Currently, reducing greenhouse gas CO2 emission from fossil fuel combustion focuses on energy conservation and emission reduction in the blast furnace (BF)1,2) of ironmaking process. In order to reduce energy consumption and pollution emission, many researchers have tried many studies around fuel structure of BF and new technologies of iron-making. H2 can replace carbonaceous fuel as heating agent and reducing agent of BF under certain conditions.3) Furthermore, Japan and other countries have been developing the new BF technology with pure oxygen and injecting hydrogen fuel.4,5) This technology has not only achieved zero CO2 emissions but also reduced atmospheric haze caused by coal-fired. However, the reaction between a large amount of H2O in BF created by hydrogen fuel injection and coke has a significant impact on the properties of coke.6,7) In this respect, many researchers have done a lot of studies. Takahata8) considered that the solution loss of coke with H2O is more severe and the reaction rate is about 3–4 times as fast as that with CO2. Kashihara et al.9) compared coke strength after reaction (CSR) reacting with CO2 and H2O at the same solution loss rate (30%), and found that CSR of coke reacting with H2O was higher than that with CO2 at the temperature of 950°C–1 500°C. Wang et al.10) studied the effect of temperature on apparent porosity using spherical coke, and found that apparent porosity decreased with the temperature. Pusz et al.11) studied the pore structure and Degradation Behavior of Coke Reacting with H2O and CO2 at High Temperature

Degradation Behavior of Coke Reacting with H<sub>2</sub>O and CO<sub>2</sub> at High Temperature