Process development and practice of HyCROF

MAO Xiaoming; XU Haifa

doi:10.13228/j.boyuan.issn0449-749x.20240317

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Iron and Steel ›› 2024, Vol. 59 ›› Issue (9) : 32-37. DOI: 10.13228/j.boyuan.issn0449-749x.20240317

Low-carbon Ironmaking

Process development and practice of HyCROF

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Abstract

Under the policy constraints of the national dual carbon goals, the blast furnace converter process will face increasingly severe low-carbon transformation pressure. After hundreds of years of development, the modern blast furnace ironmaking process has been very mature. A reactor better than the blast furnace haven't been found in today's metallurgical industry, whether on thermal efficiency or capacity scale. It is a huge loss to completely abandon the blast furnace process, which is not feasible in the short term. In order to meet the requirements of low-carbon development and extend the vitality of blast furnaces, China Baowu has independently developed a new process called HyCROF （Hydrogen-enriched Carbonic oxide Recycling Oxygenate Furnace）, aiming to achieve significant carbon reduction in ironmaking through carbonic oxide recycling and clean energy substitution. In order to turn technological concepts into reality, China Baowu conducted basic research on four major technical difficulties deep economic removal of CO₂ from the top gas of HyCROF, safe and efficient heating of high reduction potential gas, design of tuyere injection device based on competitive combustion, and reasonable gas distribution under pure oxygen injection and carbonic oxide recycling. Then, an industrial scale HyCROF test platform was constructed through transformation. A large amount of industrial empirical research has continuously conducted on the platform. The results of industrial empirical research show that the new HyCROF process is safe, stable, smooth, efficient, and has strong resistance to fluctuations. It can significantly reduce the proportion of reducing agents. When the coal injection ratio is equivalent, the consumption of solid fuel has decreased by about 30% compared to the baseline period. The main reduction is coke consumption, and the carbon emissions per ton hot metal have decreased by more than 20%. It has good compatibility with traditional manufacturing processes and has certain advantages in manufacturing costs compared to other carbon reduction technologies. Given the excellent experimental results of the HyCROF process, its technology has been applied to a 2 500 m³ blast furnace.

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HyCROF / carbonic oxide recycling / hydrogen-enriched smelting / gas heating / low carbon ironmaking

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MAO Xiaoming, XU Haifa. Process development and practice of HyCROF[J]. Iron and Steel, 2024, 59(9): 32-37 https://doi.org/10.13228/j.boyuan.issn0449-749x.20240317

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