A method for lowering the furnace temperature of a blast furnace

Abstract

The invention relates to a method of reducing furnace temperature in a blast furnace. The method comprises the following steps that (1), furnace temperature is reduced, and when the furnace temperature is greater than or equal to 0.07%, the furnace temperature is reduced by reducing the fuel ratio by 4-6 kg every four hours; (2), furnace temperature is controlled, and when the furnace temperatureis in the range from 0.55% to 0.69%, the furnace temperature is reduced by reducing 4-6 kg for the first four hours and slightly calling back by 2-3 kg for the later four hours; and (3), the fuel ratio is determined, and when the furnace temperature is 0.45% + / - 0.05% in two heats, the average fuel ratio of the first eight hours is taken as the fuel ratio controlled during smelting. The method ofreducing furnace temperature in the blast furnace can reduce the consumption of ironmaking fuel and reduces the cost of ironmaking.

Description

technical field [0001] The invention relates to a method for lowering the furnace temperature of a blast furnace. Background technique [0002] Furnace temperature refers to the mass percentage of silicon content in molten iron in blast furnace ironmaking. The level of silicon content in molten iron is positively correlated with the fuel ratio consumed by the blast furnace (the sum of dry coke and pulverized coal in kilograms consumed for smelting one ton of iron). Therefore, lowering the furnace temperature can also reduce fuel consumption. For blast furnace operators, lowering furnace temperature is a common operation in blast furnace operation. However, due to the unscientific method of lowering the furnace temperature, two situations usually occur. One is that the furnace temperature is too conservative when lowering the furnace temperature, and the furnace temperature does not reach the specified range for a long time; In a short period of time, it fell below the norm...

AI Technical Summary

Problems solved by technology

However, due to the unscientific method of lowering the furnace temperature, two situations usually occur. One is that the furnace temperature is too conservative when lowering the furnace temperature, and the furnace temperature does not reach the specified range for a long time; In a short period of time, it fell below the normal control lower limit level, and then there was a process of raising the furnace temperature. What's more, when the furnace temperature was lowered, the controlled furnace temperature was too low, and phenomena such as sliding scales, suspended materials, and hearth freezing occurred. Blast furnace production brings serious harm, and increases the fuel consumption of ironmaking, which increases the cost of ironmaking