Blast furnace chute polycyclic distributing method

Abstract

The invention discloses a blast furnace chute multi-ring burden distribution, which comprises firstly calculating the distance from the center of furnace burden from the center of a blast furnace after furnace burden fell into an xy plane, secondly deciding largest and smallest burden distribution angles in theory, thirdly deciding the actual burden distribution angles of outer ring and inner ring of ores and coke, fourthly deciding the burden distribution ring number of ores and coke, determining the burden distribution angle of middle ring of ores and coke and the angel difference of adjacent rings, and sixthly determining the burden distribution rings of each ring in ores and coke. The process largely enriches the regulating method on the upper portion of the blast furnace, changes coal gas distribution, effectively increases the coal gas usage of the blast furnace, reduces coke ratio, realizes the stable and long term operation of the blast furnace, has strong loading material capacity, can eliminate furnace burden gravity segregation and the existing of pile top, much reasonably distributes furnace burden, is beneficial for strengthening smelting, and improves the press amount relationship and further increases the air quantity of the blast furnace.

Description

technical field [0001] The invention relates to an improvement of a blast furnace ironmaking material distribution process, in particular to a blast furnace chute multi-ring material distribution method. Multi-ring fabric, as the name suggests, is a can of material with multiple α angles, that is, the material distribution chute has different distribution angles during the material distribution process of the same tank, which belongs to the field of smelting technology. Background technique [0002] The traditional distribution methods of blast furnace smelting mainly include: top distribution with bell and bellless chute. Currently, the single ring distribution method is adopted for the distribution of bellless chute. There are defects such as furnace material segregation, low gas utilization rate and single adjustment means in the charging bell furnace roof distribution method. The single-ring distribution method of the chute, as the name suggests, has an α angle for one ...

AI Technical Summary

Problems solved by technology

When the ore batch is small and the hourly batch is greater than 6 batches, it is difficult to ensure the normal operation of the material line

[0005] 2. The single-ring fabric charging system is 2CC↓OO+J 0 ↓(i.e. two batches of raw material plus one medium coke), due to insufficient feeding capacity, it is impossible to add medium coke in each batch, taking two batches of normal material and adding one medium coke will artificially cause large fluctuations in the amount of central coke, resulting in The distribution of the center coke is uneven, the center air window is "closed and closed", the center air flow is unstable, and sometimes due to uneven material speed or when the material line is empty, the center coke is changed to 4 batches for one time due to insufficient feeding capacity, which is even more serious central flow fluctuation

[0006] 3. The distribution of gas is unreasonable, the utilization is not high, the adjustment method is single, and the adjustment effect is not good

[0015] The commonly used methods for daily adjustment are: change Δα, followed by the increase or decrease of the amount of coke, the gas distribution is characterized by the highest point at the edge, the second point, the sub-central point is lower than ≤ 13.5%, and the overall central ring is too wide Trumpet flower type, increase the Δα edge in the adjustment, the ring is wider, the furnace top imaging shows that the center ring is wide and the flame is weak, reduce the Δα edge is lighter, the top imaging edge ring is wide, in short, the adjustment effect is poor

[0016] 4. Cloth segregation and heap tip cannot be solved

[0017] The blast furnace has no material clock and a batch of material, the chute rotates 10 times, each circle is 8 seconds, the charge is in a slow flow, stays, leaves the charge of the chute, the powder is near the pile tip, and the large-grained charge rolls into the bottom to form in the furnace Automatic grading to form charge segregation, if increase α K , due to the powder, it is easy to cause the edge to be aggravated, and after a batch of material distribution is completed, a charge pile tip is formed on the material surface, causing uneven thickness of the ore layer

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