Meishan steelmaking mature application of top-bottom blowing technology

In September 2003, Meishan Steel Plant's top and bottom re-blowing steel technology successfully passed the functional assessment, indicating that this international advanced technology has been used in the plant.
Meishan Steel Plant last August in the organization of technical forces for the feasibility study of the top and bottom re-blowing steel technology project, increased the top and bottom re-blowing system, the two converter original gas supply valve has been completely transformed, Change the original four-hole oxygen gun to six holes. At the same time, the steel mills vigorously optimized the smelting process and improved the operating skills of the employees, so that the top-bottom blowing technology gradually stabilized.
The functional assessment conducted a comprehensive test on the equipment and technology provided by the German side and examined whether the phosphorus content in molten steel can be controlled below 0.010%. The tested 50-molar molten steel has a compositional compliance rate of over 90%. Oxygen lances, bottom-blowing systems and other equipment operate stably. The function and technical parameters meet the design requirements, and automatic steelmaking is realized. This technology has solved the problem of dephosphorization in Meishan high-phosphorus hot metal smelting. In addition, the project's transformation of oxygen lances broke through the limits of the Mach number, which was difficult to exceed 2.0 by domestic oxygen lance design, reaching 2.25, which was at the forefront of similar converters.