CSR measures the coke's ability to withstand degradation within the harsh environment of a blast furnace. High CSR is crucial for maintaining good permeability and efficient gas flow in the furnace, which directly affects productivity and iron quality..
Fluidity refers to the coking coal's ability to melt and resolidify during the coking process. Sufficient fluidity is essential for forming a strong and porous coke structure. If the coal is not fluid enough, it won't properly bind together, resulting in weak coke that can crumble and impede airflow in the blast furnace.
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The relationship between CSR and fluidity is complex and intertwined. Generally, coals with higher fluidity tend to produce coke with higher CSR. This is because good fluidity allows the coal particles to fuse effectively, creating a strong coke structure that can withstand the stresses within the blast furnace. However, the relationship is not always linear. Other factors, such as coal rank, petrographic composition (types of macerals present), and mineral matter content, also influence CSR. Optimal fluidity is crucial. Excessively high fluidity can lead to excessive swelling and the formation of an overly porous coke structure, which can negatively impact CSR. Furthermore, excessive fluidity can cause coals to stick to the oven walls, damaging the coke oven and hindering efficient operation. Therefore, achieving the right balance of fluidity and other coal properties is essential for producing high-quality coke with good CSR. This is where careful coal selection and blending come into play. Steel producers need to carefully analyse the fluidity and other characteristics of different coking coals to create blends that optimize coke strength and performance in the blast furnace.
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