Study on Numerical Simulation of Blast Furnace Injection of Low-Rank Coal by Hydrothermal Carbonization

Yu Zeng, Nan Zhang, Andrey Karasev, Xiaojun Ning (), Guangwei Wang (), Jianliang Zhang and Chuan Wang
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Yu Zeng: State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
Nan Zhang: Henan Iron and Steel Group, Henan Advanced Steel Materials Industry Research Institute, Zhengzhou 450046, China
Andrey Karasev: Material Science and Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
Xiaojun Ning: State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
Guangwei Wang: State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
Jianliang Zhang: State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
Chuan Wang: Material Science and Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden

Energies, 2025, vol. 18, issue 19, 1-18

Abstract: This study carried out a detailed investigation into the potential application of hydrothermally treated bituminous coal (hydrochar) as an injectant in blast furnace (BF) ironmaking. A tuyere model was constructed through simulation methods, and the influence of hydrochar injection on the thermal conditions within the BF hearth was also thoroughly analyzed. The results show that the gas flow velocity at the lower part of the tuyere of hydrochar injection increases, and the residual carbon mass fraction of the tuyere decreases. As the oxygen-enriched concentration increases, the CO concentration decreases. The CO concentration in the swirl zone after hydrochar injection is the highest, reaching 43.93%. The distributions of CO and CO 2 exhibit opposite tendencies. Following hydrochar injection, a marked rise in temperature is observed. At an oxygen enrichment level of 30%, the tuyere zone temperature associated with hydrochar injection peaks, surpassing 2700 K. The corresponding pulverized coal burnout rate is also the highest. Thus, the injection of hydrochar has a positive impact on the air flow and temperature field, which can effectively maintain the heat balance and is conducive to strengthening BF smelting.

Keywords: low-rank coal; hydrothermal carbonization; blast furnace injection; combustion behaviors; computational fluid dynamics (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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