Smelting method for medium coke used in large bell-less blast furnace in high proportion

Abstract

The invention relates to the technical field of ferrous metallurgy, in particular to a smelting method for medium coke used in a large bell-less blast furnace in a high proportion. According to the smelting method, medium coke is prevented from being distributed into the center of the blast furnace by a small coke distribution method, a damping-down material improving structure is proposed after a large amount of medium coke is used, and central airflow development and rapid recovery are guided by adopting a load sharing and central tank coke adding method; a proper edge load increasing and large batch weight smelting method is provided to inhibit edge airflow development; and a stokehole tapping structure is enhanced, the clay ramming amount is standardized, the iron notch depth is stabilized, and the effective tapping time is guaranteed. These measures are adopted when the medium coke used in the high proportion is produced, so that the medium coke can be successfully prevented from being distributed into the center of the blast furnace to influence the quality of furnace core coke under the condition of not reducing coke load, rapid recovery after damping down of the blast furnace is guaranteed, edge coal airflow can be stabilized and the central airflow can be developed in daily operation, a hearth is facilitated to be active, and long-term stable smooth operation of the blast furnace is ensured.

Description

technical field

[0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a smelting method for a large-scale bellless blast furnace using medium lump coke at a high proportion. Background technique

[0002] In the field of metallurgical coke, the particle size of bulk coke is generally 40-60mm, and the particle size of medium coke is generally 20-40mm. The proportion of medium coke used in large blast furnaces in normal production is generally about 12%, and it is high when it exceeds 20%. Production: due to insufficient coking capacity, blast furnaces began to use a large number of floor-to-ceiling cokes for production. The coke ratio of medium cokes reached up to 110Kg / t, accounting for 31.4% of the coke ratio in the furnace. With some minor changes, the air volume began to shrink, the wind pressure increased and the stability deteriorated, the air permeability decreased, the antegrade state deteriorated, and the phenomenon of oper...

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