Abstract
Abstract Blast furnace heat is the key to the blast furnace’s high efficiency and stable operation, and it is difficult to maintain a suitable temperature for large blast furnace operations. When designing the furnace heat prediction and control model, parameters with good reliability and measurability should be chosen to avoid using less accurate parameters and to ensure the accuracy and practicability of the model. This paper presents an effective model for large blast furnace temperature prediction and control. Using thermal equilibrium and the carbon-oxygen balance of the blast furnace’s high-temperature zone, the slag-iron heat index was calculated. Using the relation between the molten iron temperature and slag-iron heat index, the furnace heat parameter can be calculated while production conditions are changed,which can guide furnace heat control.
Highlights
Maintaining reasonable heat is the key to the blast furnace’s high efficiency and stable operation
Blast furnace heat is the key to the blast furnace’s high efficiency and stable operation, and it is difficult to maintain a suitable temperature for large blast furnace operations
This paper presents an effective model for large blast furnace temperature prediction and control
Summary
Maintaining reasonable heat is the key to the blast furnace’s high efficiency and stable operation. The blast furnace benchmark data were used in the blast furnace high temperature thermal equilibrium and carbon-oxygen balance equations, the theoretical PCI rate was calculated, the theoretical direct reduction of carbon consumption under the benchmark conditions and slag-iron heat index was calculated. The blast furnace target parameters was used in the thermal equilibrium and carbon-oxygen balance equations for the blast furnace high-temperature zone, target slag-iron heat index was calculated, the relation between the temperature and slag-iron heat index was established, and the. Molten iron temperature and [Si] were calculated; corresponding to the target molten iron temperature, the slag-iron heat index was used in the blast furnace high temperature thermal equilibrium and carbon-oxygen balance equations, and the PCI rate and the quantity of coal needed were calculated, such that heat control could be achieved.
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