A method for enhancing the smelting effect of a bottom-blown smelting furnace and improving melt splashing

A smelting furnace and bottom blowing furnace technology, applied in the field of bottom blowing smelting, can solve the problems of uneven injection and stirring, high metal loss rate, low smelting efficiency and the like

Active Publication Date: 2021-07-16
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of uneven gas injection and stirring, serious splashing, low smelting efficiency, and high metal loss rate in a large bottom-blowing smelting furnace, different spray gun arrangements were proposed, and process parameters and equipment parameters were optimized to achieve improved The purpose of smelting efficiency, suppressing splashing, reducing the circulation of metal in slag, and improving the production capacity of bottom blowing furnace

Method used

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  • A method for enhancing the smelting effect of a bottom-blown smelting furnace and improving melt splashing
  • A method for enhancing the smelting effect of a bottom-blown smelting furnace and improving melt splashing
  • A method for enhancing the smelting effect of a bottom-blown smelting furnace and improving melt splashing

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1 (cross-flow injection):

[0033] Taking an implementation of cross-flow blowing as an example (this example is to change the axial distance of the spray guns), all the spray guns of the bottom blowing furnace are numbered sequentially from the side close to the smoke exhaust port to ensure that the total air supply volume and the diameter of the spray guns are not changed. Change, and the air pressure or air supply volume of each spray gun is equal. A group of fans is used to supply air to two groups of spray guns, and the axial distance between odd-numbered spray guns and even-numbered spray guns is changed, so that the airflow distance injected into the melt by each adjacent two spray guns increases, and the airflow superposition effect becomes weaker, resulting in " "Cross-flow blowing" effect, the original spacing is 380mm, in this example the adjusted spacing is 610mm.

[0034] Solve the flow field in the furnace under the two working conditions throu...

Embodiment 2

[0035] Embodiment 2 (staggered peak injection):

[0036] Taking an implementation of staggered peak injection as an example (this example is to change the ratio of spray gun diameters), all the spray guns of the bottom blowing furnace are numbered sequentially from the side close to the smoke exhaust port, and a group of fans are used to supply air to the two groups of spray guns , to ensure that the total air supply volume, the total spray area and the outlet end pressure of each spray gun are the same, and by changing the diameter ratio of the odd and even two sets of spray guns, each adjacent two spray guns are sprayed into the melt with different airflow intensities, resulting in " Peak staggered injection" effect, the area ratio is 1:1 under the original working condition, now it is adjusted to 1.2:0.8, and the diameter ratio is 1.095:0.894.

[0037] Solve the flow field in the furnace under the two working conditions through numerical simulation, take the melt in the sti...

Embodiment 3

[0039] Taking a copper bottom blowing furnace as an example, there are 14 groups of spray guns on the same side of the center near the bottom of the furnace body. Every two spray guns form a group, with a total of 28 spray guns. The adjacent two groups of spray guns are arranged alternately. The 14 groups of spray guns are numbered sequentially from the side close to the smoke exhaust port, the angles of the 7 odd groups of spray guns can be adjusted from 6 to 12°, and the angles of the 7 even groups of spray guns can be adjusted from 21 to 27°. The distance between the two spray guns in each group is 380-610mm, and the distance between two adjacent groups of spray guns is 1150mm. Vertical to the wall of the furnace body, the airflow is blown into the furnace vertically from the outlet of the spray gun. A simple schematic diagram of a bottom-blown melting furnace figure 1 .

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Abstract

The invention discloses a method for strengthening smelting and improving melt splashing in a bottom blowing smelting furnace, which belongs to the technical field of bottom blowing smelting furnaces. The method includes: cross-flow injection; staggered-peak injection; the combination of cross-flow injection and staggered-peak injection. Cross-flow injection is to ensure that the injection intensity of each group of adjacent spray guns is the same, by changing the position of the spray guns, the state of the two adjacent injection airflows is different, so as to alleviate the superposition of airflow, suppress splashing, and strengthen the injection. ; Staggered peak injection is to ensure that the positions of each group of adjacent spray guns are the same, by changing the injection intensity, the state of two adjacent injection airflows is different, so as to alleviate the superposition of airflow, suppress splashing, and strengthen the injection . With this method, the melt in the bottom blowing furnace can be stirred more evenly, the charge can be fully reacted, the slag produced by the bottom blowing smelting can be prevented from entraining metals and raw materials, the splashing of the melt surface layer can be improved, and the wall near the spray gun can be weakened. The phenomenon that the scouring stress is too concentrated can increase the productivity of the bottom blowing smelting furnace.

Description

technical field [0001] The invention belongs to the technical field of bottom blowing smelting, and in particular relates to a method for enhancing the smelting effect of a bottom blowing smelting furnace and improving melt splashing. Background technique [0002] Bottom blowing furnace smelting technology was originally applied in converter steelmaking to remove sulfur, phosphorus, silicon and other impurities in molten iron and control carbon content, and has been widely used in the steel industry all over the world. In view of the successful application and many advantages of oxygen-enriched bottom blowing smelting technology in steelmaking, it has gradually been widely used in lead smelting, copper smelting and other fields. It has the characteristics of strong adaptability to raw materials, high efficiency, energy saving, and environmental protection. [0003] Some of the existing copper bottom-blowing furnaces and bottom-blowing smelting processes have problems such as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B15/00
CPCC22B15/003
Inventor 赵洪亮穆亮照王成彦刘风琴王玲张文娟马保中
Owner UNIV OF SCI & TECH BEIJING
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