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Distribution method for stabilizing central airflow of blast furnace

A technology for distribution and blast furnace, which is applied to the distribution field of stabilizing the airflow in the center of the blast furnace, can solve the problems such as the deterioration of the blast furnace index, the influence of the stability of the blast furnace condition, and the imprecise placement of the charge.

Pending Publication Date: 2022-03-08
BENXI BEIYING IRON & STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The imprecise drop point of the charge leads to poor air flow stability in the center of the blast furnace, which ultimately affects the stability of the blast furnace condition and deteriorates the blast furnace index

Method used

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  • Distribution method for stabilizing central airflow of blast furnace
  • Distribution method for stabilizing central airflow of blast furnace
  • Distribution method for stabilizing central airflow of blast furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1 adopts the ore distribution method described in the present invention, and the distribution matrix of ore is Its working principle is: after the ore is distributed on the mine platform, the distribution chute will tilt back from the minimum gear to the middle gear, and then continue to distribute materials, so as to prevent a small amount of ore from entering the central non-mine area during the downward inclination of the distribution chute. Simulated material surface A such as figure 2 As shown, the ore on the mining platform has no slipping phenomenon.

Embodiment 2

[0034] The coke distribution matrix that embodiment 2 adopts is Its working principle is: the material chute closes the throttle valve at the minimum gear position after the coke cloth is finished on the coke platform to stop the material distribution, the material distribution chute continues to tilt down to the gear corresponding to the center coke, and then opens the throttle valve to continue the material distribution, and the remaining coke (Central coke) is placed in the center of the blast furnace to avoid placing coke on the ring belt between the sub-center and the center coke gear, reduce the size of the coke stack ring in the center of the blast furnace material surface, and improve the accuracy of the center coke amount, thereby stabilizing Blast furnace center airflow. Simulated material surface A such as Figure 4 As shown, the coke did not slip to the ring zone between the sub-center and the center coke gear.

[0035] Such as Figure 5 As shown, in Example ...

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Abstract

The invention relates to a material distribution method for stabilizing blast furnace center airflow, which comprises the following steps: 1) during ore material distribution, directly adjusting a material distribution chute back to a gear in the middle of a corresponding ore platform from a minimum gear after the ore platform is formed, and then carrying out material distribution on residual ore to prevent the residual ore from entering a center non-mining area; 2) during coke distribution, closing a throttle valve to stop distribution at the minimum gear of the distribution chute after a coke platform is formed, and then opening the throttle valve to distribute residual coke after the distribution chute is adjusted to the gear corresponding to the central coke, so as to avoid distribution on an annular belt between the secondary center and the central coke; the coke finally distributed in the furnace is divided into two parts, namely platform coke and center coke, the center coke accounts for 15%-20%, and the platform coke accounts for 80%-85%. The method can effectively eliminate the defect of bell-less top material distribution, stabilizes blast furnace center airflow, improves the stability of blast furnace conditions, and improves blast furnace indexes.

Description

technical field [0001] The invention relates to the technical field of blast furnace smelting, in particular to a material distribution method for stabilizing the central airflow of a blast furnace. Background technique [0002] At present, the blast furnace often adopts the bellless distribution method, and the bellless distribution can be used for multi-ring distribution, and it is easy to form a distribution platform, that is, the distribution area is composed of a ring platform and a central funnel. The size of the platform can be controlled by adjusting the amount of coke and ore loaded. If the platform is small and the funnel is large, the material surface will be unstable; if the platform is large and the funnel is small, the central gas flow will be controlled. Generally, the inner diameter of the coke platform of a large blast furnace is 1.2-1.5m, and the inner diameter of the ore platform is about 1.7m, and the charge with a large particle size tends to roll to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
CPCC21B5/008
Inventor 邹德胜宋永刚王光亮刘森张军陈正林孙世家王俊清李杰
Owner BENXI BEIYING IRON & STEEL GROUP
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