Central coke adding method for reducing coke ratio of blast furnace
A blast furnace and coke technology, which is applied in the field of central coking for reducing blast furnace coke ratio, can solve the problems of reducing blast furnace iron-making coke ratio, poor stability of raw materials, less consideration, etc. The effect of usage
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Embodiment 1
[0027] In the central coking method for reducing the coke ratio of the blast furnace in this embodiment, the central coking amount is 15% of the amount of fuel (semi-coke + coke) charged at the top of the furnace. Coke is placed in the tank first, M25≥92.1%, M10≤7.0%, CSR≥60.2%, the proportion of the coke with a particle size range of 25-40mm is ≤20.0%, and the average particle size is ≥51.2mm. Then add high-reactivity semi-coke, M25≥70.5% of high-reactivity semi-coke, M10≤5.0%, CSR≥20.3%, proportion of particle size less than 20mm≤10.0%, average particle size≥40.9mm, CRI≥55.2%. The coke falls into the central area of the furnace first, and the mass ratio of highly reactive semi-coke to coke in the central area of the blast furnace is 0.01:1. The blast furnace distribution system is adjusted accordingly, in which the height of the material line is reduced by 0.1m, the distribution angle of the coke center is increased by 0.1°, and the distribution angle of the coke edge is...
Embodiment 2
[0030] In the central coking method for reducing the coke ratio of the blast furnace in this embodiment, the amount of central coking is 20% of the amount of fuel (semi-coke + coke) charged at the top of the furnace. Coke is placed in the material tank first, M25≥92.6%, M10≤6.5%, CSR≥61.7%, the proportion of the coke with a particle size range of 25-40mm is ≤19.2%, and the average particle size is ≥51.6mm. Then add high-reactivity semi-coke, M25≥71.7%, M10≤5.0%, CSR≥20.5% of high-reactivity semi-coke, proportion of particle size less than 20mm≤9.8%, average particle size≥40.7mm, CRI≥56.4%. The coke falls into the central area of the furnace first, and the mass ratio of highly reactive semi-coke to coke in the central area of the blast furnace is 0.18:1. The blast furnace distribution system is adjusted accordingly, in which the height of the material line is reduced by 0.2m, the distribution angle of the coke center is increased by 1°, and the distribution angle of the cok...
Embodiment 3
[0033] In the central coking method for reducing the coke ratio of the blast furnace in this embodiment, the central coking amount is 25% of the amount of fuel (semi-coke + coke) charged at the top of the furnace. Coke is placed in the material tank first, M25≥93.4% of coke, M10≤5.9%, CSR≥62.3%, the particle size range of 25-40mm accounts for ≤18.6%, and the average particle size is ≥51.9mm. Then add high-reactivity semi-coke, M25≥72.8%, M10≤5.0%, CSR≥20.7% of high-reactivity semi-coke, the proportion of the particle size is less than 20mm≤9.4%, the average particle size≥40.3mm, CRI≥57.1%. The coke falls into the central area of the furnace first, and the mass ratio of highly reactive semi-coke to coke in the central area of the blast furnace is 0.35:1. The blast furnace distribution system is adjusted accordingly, in which the height of the material line is reduced by 0.3m, the distribution angle of the coke center is increased by 2°, and the distribution angle of the cok...
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