Problems with dry quenching of coke?

After switching to dry quenching, the moisture content of coke decreases while its strength increases. Due to the different moisture levels of the two types of coke, it poses difficulties in blast furnace calculations, especially as it is not easy to carry out such calculations simultaneously ； The level of moisture has almost no impact on blast furnace operation ； Due to the increased strength, the ratio of focal length should theoretically decrease, allowing the blast furnace to operate more smoothly.

In a blast furnace, in addition to participating in chemical thermo-reduction reactions, coke also serves as a structural framework to improve the furnace’s air permeability and stabilize its operation. This requires coke to have high resistance to crushing and strength after reaction, as well as low reactivity. At present, with no significant changes in the coal blending ratio, the performance parameters of coke produced by dry quenching have improved, particularly in terms of heat strength. The improvement in these indicators is highly beneficial for the stable progress of ironmaking production, as well as for increasing output while reducing coke consumption. The impact of coke quality on blast furnace ironmaking (1) Impact of crush resistance strength M40 and wear resistance strength M10: For every 1% decrease in M40, the utilization efficiency of the blast furnace decreases by 3%-4%, and the coke ratio (the weight of coke consumed to produce 1 ton of pig iron) increases by 1. 3%-5% ； For every 0. decrease in M10. 1%, with the blast furnace’s production capacity increasing by 0. 3%-1. 3%, with the focal ratio decreasing by 0. 2%-0. 6%. (2) Sulfur content: During coking, about 60% of the sulfur in coal is transferred to the coke. Sulfur is a harmful impurity in coke, as it can make pig iron brittle. To remove the excessive sulfur content from coke, it is necessary to increase the amount of solvent limestone and coke used, which reduces the utilization efficiency of the blast furnace and leads to a decrease in pig iron production. For every 0 increase in the sulfur content of coke. 1%, and the usage of limestone and coke will increase by 3 respectively. 7% and 1. 8%, with the blast furnace’s production capacity decreasing by 2%-2%. 5%. The sulfur content in metallurgical coke is specified to be no more than 0. 8%. (3) Ash: During coking, all the ash in coal is transferred to the coke; if the ash content of the raw coal is 8%, the ash content of the coke will be around 12%. For every 1% increase in coke ash content, the amount of coke required increases by 2%-2%. 5%, the amount of solvent limestone used increases by 4%, blast furnace pig iron production decreases by 3%, and coke strength drops by 2. 2%. (4) Volatiles: The maturity level of coke can be determined based on its volatiles content; the volatiles content should be greater than 1. 5% of the coke is green coke, less than 0. 5%-0. 7%, indicating excessive coking; generally, the volatil content of properly matured coke is around 1%. (5) Moisture: The moisture content of coke is generally 3%-7%. Variations in moisture affect measurement and can cause fluctuations in the operation of the blast furnace. Last edited by Dopoda on 2009-3-27 10:17.]