Industrial Practice Of Adding Scrap Steel To Iron Blast Furnace To Reduce Consumption And Increase Production

With the increase in the ratio of scrap steel into the furnace, the 5 blast furnace has achieved certain results in increasing production and reducing consumption. Compared with the benchmark period, the average scrap ratio in the test period was 49.5kg/t, the fuel ratio dropped by 23kg/t, and the daily pig iron output increased by 342t/d. The regression analysis of industrial test data shows that: the grade of blast furnace entering the furnace, the daily output of pig iron, the air volume, and the air pressure are positively correlated with the scrap ratio. The scrap ratio increases by 1kg/t, the furnace grade increases by 0.03%, and the daily output of pig iron increases by 5.67t/d. The air volume increases by 1.4m³/min, and the wind pressure increases by 0.11kPa. When the scrap ratio reaches 100kg/t, the output increases by about 470t/d, and the blast furnace utilization factor reaches 2.55t/(m³·d) or more; the blast furnace fuel ratio is negatively correlated with the scrap ratio, and the scrap ratio increases by 1kg/t, the fuel ratio Decrease 0.54kg/t. When the scrap ratio reaches 100kg/t, the fuel ratio drops by 40kg/t, and the minimum fuel ratio drops to 532kg/t. Compared with the baseline period, the total cost of the blast furnace increases after adding scrap during the test period.