Center fire striking method for blast furnace smelting

Abstract

The invention discloses a center fire striking method for blast furnace smelting, belongs to the technical field of blast furnace smelting, and provides a center fire striking method for blast furnacesmelting, accordingly, airflow can be guided to be developed towards the center, the center airflow is properly strengthened, and the edge airflow is weakened. In the center fire striking method, under the furnace condition that center fire striking needs to be conducted in the blast furnace smelting process, in the adjacent next-batch coke material distribution adding operation process, the cokeadding amount is increased on the basis of the normal adding amount of the batch of the coke, the added coke adding amount is the coke increasing amount, and the coke increasing amount is completelyadded to the innermost ring of a coke material distribution ring. The coke adding amount is increased at the center part of a blast furnace, the air permeability of a stock column at the center of theblast furnace can be greatly loosened, accordingly, center airflow can be enhanced, meanwhile, edge airflow is weakened, and then the airflow is guided to be developed towards the center; and the purpose of center fire striking is finally achieved.

Description

technical field [0001] The invention relates to the technical field of blast furnace smelting, in particular to a central ignition method for blast furnace smelting. Background technique [0002] The blast furnace smelting operation theory holds that the blast furnace gas flow has gone through three distribution processes in the furnace: after the high-temperature air is blown into the furnace through the tuyere, the high-temperature gas generated by combustion reaction with coke and coal powder completes the initial distribution in the hearth. The gas flow moves upward to reach the softening zone and passes through the second distribution. The gas flow that reaches the block zone at the upper part of the blast furnace passes through the third distribution, mainly forming two airflows: edge airflow and central airflow. [0003] The adjustment of blast furnace operation is mainly carried out around the three distributions of gas flow, and its adjustment means mainly depends ...

AI Technical Summary

Problems solved by technology

Under normal furnace conditions, the imaging performance of the material surface of the blast furnace is also normal, but sometimes the kinetic energy of the blast is insufficient due to reasons such as furnace cooling and wind reduction, accidental wind reduction in front of the furnace, etc., the central airflow of the blast furnace is weakened, and the "fire" in the center of the material surface Becomes weak or even "extinguished", the top of the furnace is imaged in darkness, and the risk of damage to the furnace condition increases sharply