焼結鉱の高炉模擬反応挙動に及ぼす水素の影響

概要

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In order to further reduce CO2 emission in ironmaking, utilization of a large amount of hydrogen to a blast furnace would be essential in the near future. In this work, influence of half substitute of hydrogen to bosh gas on reaction behavior of sinter under a blast furnace simulated condition was examined until 1400°C and investigated together with List model.Reduction of sinter finalized around 1100°C in the condition of H2 substitute, while the reduction retarded around these temperatures in the condition without H2 substitute, being likely because low melting slag containing residual FeO was formed.The condition of H2 substitute provided higher carbon contents in sinter after reduction than the condition without H2 substitute. This is likely because hydrogen promoted carburization to solid iron with CO gas.The condition of H2 substitute improved softening melting behavior of sinter by nearly 70°C, being because the condition inhibited the formation of the low melting slag.From analysis based on List model it was evaluated that an operation with half substitute of hydrogen to a basic bosh gas gave less coke rate 346 kg/THM and less BF production 7945 t/d compared with 461 kg/THM and 8999 t/d in a basic operation.