Blast furnaces 1 Carbon dioxide 1 Coal 1 Efficiency 1 Gas emissions 1 Greenhouse gas emissions 1 Greenhouse gases 1 Heat balance 1 Hot metal 1 Hydrogen injection 1 Injection rates Mass balance 1 Modeling 1 Pulverized coal injection 1 Pulverized fuel 1 Reduction efficiency 1 Replacement ratio 1 Steelmaking 1 blast furnace 1 greenhouse gas emissions 1 heat and mass balance 1 hydrogen injection 1 modelling 1 pulverised coal injection 1 replacement ratio 1