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A blast furnace filling type shutdown method

A technology of filling type and blast furnace, applied in blast furnace, blast furnace details, furnace, etc., can solve the problems of slow process, control furnace top temperature, unfavorable problems, etc., achieve the effects of reducing impact, speeding up the shutdown process and improving work efficiency

Active Publication Date: 2021-07-13
XINXING DUCTILE IRON PIPES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional method of shutting down the furnace generally reduces the load from 4.0 to about 2.80 for full coke smelting before starting to load the filling material. Because of the light load, the process is very slow, and the furnace top temperature is not easy to control
Moreover, the traditional method is to stop coal, oxygen and furnace, which is not conducive to controlling the temperature of the furnace top.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0047] Below 500m 3 The blast furnace is used as the object of implementation, and the above-mentioned blast furnace filling method is used to shut down the furnace.

[0048] 1. First calculate the existing volume of each part of the blast furnace:

[0049] project Furnace throat Furnace Hearth Bosh Design Furnace Capacity (m3) 32.41 290.17 57.20 93.82 Actual furnace capacity (m3) 32.41 309.59 60.53 99.85 Filling volume (m3) 0 193 60.53 99.85

[0050] The design furnace volume is the volume calculated from the size marked on the design paper;

[0051] The filling volume is the existing actual volume under the current conditions of the blast furnace: the part above the material line is deducted from the throat part; the actual erosion situation and the slag skin formed after production are considered in the furnace body, furnace waist and bosh part.

[0052] The above is our factory 500m 3 Blast furnace design furnace volume an...

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Abstract

The invention relates to a filling type shutdown method of a blast furnace, which belongs to the technical field of blast furnace maintenance. The method adopts heavy-duty shutdown; during the shutdown process, coal is not stopped and more oxygen is enriched. It mainly includes the following steps: (1) Calculate the volume of the blast furnace throat, shaft, waist and bosh, and calculate the amount of filling material; (2) Determine the load of the blast furnace, and calculate the theoretical iron output of the blast furnace. The amount of iron determines the start time of the wind break; (3), the material lowering line. The furnace shutdown method of the present invention is convenient for furnace temperature control, the furnace shutdown process is fast, and the material line can be reduced to 8.0m. The material in the furnace is reduced by 30%-50% when the furnace is shut down to clean up.

Description

technical field [0001] The invention relates to a filling type shutdown method of a blast furnace, which belongs to the technical field of blast furnace maintenance. Background technique [0002] The method of blast furnace shutdown is generally divided into two methods: filling method and empty material line method. The method of empty material line adopts that no material is charged into the furnace during the shutdown process, and the temperature of the furnace top is controlled by pumping water from the furnace top. When the material line falls to the vicinity of the tuyere, the wind is shut down. The advantages of this method are: after the shutdown, the cleaning workload in the furnace is less, and the shutdown process is accelerated, which wins time for major and medium repairs. The disadvantage is that the safety is not guaranteed during the shutdown process, and the furnace wall is prone to fall off, resulting A series of detonation accidents. The filling method i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/00
CPCC21B5/00C21B5/006
Inventor 杨广洲
Owner XINXING DUCTILE IRON PIPES CO LTD
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