<p>A new technological process involving the introduction of an induction furnace (IF) powered by green electricity was proposed for reducing the CO<sub>2</sub> emission in the conventional blast furnace–basic oxygen furnace (BF–BOF) steelmaking route. The proposed BF–IF–BOF process gains benefits from preheating and smelting scraps utilizing green electricity and further remarkably cuts down the CO<sub>2</sub> emission in BOF steelmaking. The CO<sub>2</sub> emissions of conventional and new processes have been comparatively analyzed according to the actual data from a commercial steel plant in China, taking into account the upstream CO<sub>2</sub> emission, direct CO<sub>2</sub> emission, and credit CO<sub>2</sub> emission. The analysis revealed that the CO<sub>2</sub> emission factor of internal scraps from the steel plant was different from that of purchased scraps from the society but equalled to that of crude steel. The CO<sub>2</sub> injected into the BOF as a coolant could be defined as the upstream CO<sub>2</sub> emission source, and there is a net reduction of 1 t CO<sub>2</sub> emission for each ton of CO<sub>2</sub> utilized in the BOF. Compared to the BF–BOF process with a scrap ratio of 19.23%, the CO<sub>2</sub> emission reduction per ton of steel in the new process is 0.278, 0.517, 0.753, 0.987, 1.219, 1.448, and 1.683 t, respectively, as the scrap ratio increases to 30%, 40%, 50%, 60%, 70%, 80%, and 90%, and increasing the scrap ratio has a more significant impact on the emission reduction than CO<sub>2</sub> injecting. A minimum CO<sub>2</sub> emission model for the BF–IF–BOF process was established, and the minimum CO<sub>2</sub> emission per ton crude steel was calculated to be 0.677, 0.581, 0.487, 0.393, 0.300, 0.209, and 0.110 t, for the BF–IF–BOF process with the scrap ratios of 30%, 40%, 50%, 60%, 70%, 80%, and 90%, respectively.</p>

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CO2 emission reduction in a new BF–IF–BOF steelmaking process

  • Jian-hua Liu,
  • Xiao-dong Yang,
  • Yao-bin Hou,
  • Yang He,
  • Jong Jin Pak,
  • Iman El-Mahallawi

摘要

A new technological process involving the introduction of an induction furnace (IF) powered by green electricity was proposed for reducing the CO2 emission in the conventional blast furnace–basic oxygen furnace (BF–BOF) steelmaking route. The proposed BF–IF–BOF process gains benefits from preheating and smelting scraps utilizing green electricity and further remarkably cuts down the CO2 emission in BOF steelmaking. The CO2 emissions of conventional and new processes have been comparatively analyzed according to the actual data from a commercial steel plant in China, taking into account the upstream CO2 emission, direct CO2 emission, and credit CO2 emission. The analysis revealed that the CO2 emission factor of internal scraps from the steel plant was different from that of purchased scraps from the society but equalled to that of crude steel. The CO2 injected into the BOF as a coolant could be defined as the upstream CO2 emission source, and there is a net reduction of 1 t CO2 emission for each ton of CO2 utilized in the BOF. Compared to the BF–BOF process with a scrap ratio of 19.23%, the CO2 emission reduction per ton of steel in the new process is 0.278, 0.517, 0.753, 0.987, 1.219, 1.448, and 1.683 t, respectively, as the scrap ratio increases to 30%, 40%, 50%, 60%, 70%, 80%, and 90%, and increasing the scrap ratio has a more significant impact on the emission reduction than CO2 injecting. A minimum CO2 emission model for the BF–IF–BOF process was established, and the minimum CO2 emission per ton crude steel was calculated to be 0.677, 0.581, 0.487, 0.393, 0.300, 0.209, and 0.110 t, for the BF–IF–BOF process with the scrap ratios of 30%, 40%, 50%, 60%, 70%, 80%, and 90%, respectively.