A smelting method for a large-scale bellless blast furnace using a high proportion of medium lump coke

Abstract

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 coke in a high proportion. It is proposed to use the method of small coke distribution to avoid the distribution of medium coke into the center of the blast furnace. In view of the large amount of use of medium coke, it is proposed to improve the structure of the air break, and to adopt the method of equalizing the load and adding pot coke in the center to guide the development of the central air flow and recover quickly. ; Propose methods to properly increase edge load and mass heavy smelting to restrain the development of edge airflow; propose to strengthen the tapping structure before the furnace, standardize the amount of mud, stabilize the depth of the tap hole, and ensure the effective time of tapping. Taking these measures in the production of high proportion of medium lump coke can successfully prevent the medium lump coke from being distributed into the center of the blast furnace and affect the quality of the core coke without reducing the coke load, and ensure that the blast furnace can recover quickly after the blast furnace is turned off, and can be stable in daily operation. The edge gas flow develops the central air flow, which is conducive to activating the hearth and ensuring the long-term stability of the blast furnace.

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 coke in a high proportion. Background technique [0002] In the field of metallurgical coke, the particle size of large 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 is generally about 12%, and when it exceeds 20%, the proportion is high. Production; due to insufficient coking capacity, the blast furnace began to use a large amount of floor-to-ceiling medium coke for production. The ratio of medium lump coke was up to 110Kg / t, accounting for 31.4% of the coke entering the furnace. When the ratio of medium lump coke increased to 70Kg / tFe, the blast furnace appeared forward. With some minor changes, the air volume begins to shrink, the air pressure increases and the stability becomes worse, the a...

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