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Method for loading materials by blowing in blast furnace

A technology for opening and charging blast furnaces, which is applied to blast furnaces, details of blast furnaces, furnaces, etc. It can solve the problems of slow charging process, disrupting the distribution of ore coke layer, and increasing the difficulty of air volume recovery.

Active Publication Date: 2015-01-14
PANGANG GRP XICHANG STEEL & VANADIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The measurement of the material flow trajectory by the laser method is affected by the inability of the measuring equipment to work in the windy state, and it has not been able to realize the windy loading
Because after each batch of material is loaded, the clarity of the laser image can only be guaranteed after the furnace dust is exhausted, and it is necessary to wait for 1-5 minutes before distributing the material. It exists from the lower part of the furnace to the upper part of the furnace body, which disrupts the distribution of the ore coke layer originally planned, which is not conducive to the smooth operation of the furnace after the air supply, and exacerbates the difficulty of recovering the air volume after the furnace is turned on and the air supply is activated.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0036] In 2012, Xichang Iron & Steel Vanadium 2# blast furnace was opened, and coke was used to fill the furnace hearth. Through calculation, the charging table for starting the furnace is shown in Table 1 below, and the charging is carried out in order of the number of stages from small to large.

[0037] (1) The charging stage with wind in the middle and lower part of the furnace shaft

[0038] When it is in the charging process of the first to sixth stages, blow cold air to the blast furnace. In order to prevent coke from being ignited during the blasting process, the temperature of the cold air is controlled to be ≤200°C, and the pressure difference of the blast furnace is controlled to be ≤0.12MPa to prevent pulverization of the furnace charge. , (The normal air volume of the blast furnace is about 4000).

[0039] Table 1 Furnace charging list

[0040]

[0041] After the sixth section is installed, the theoretical material line is -12.5 meters, and the actual material...

Embodiment 2

[0061] When a blast furnace is started, the other specific conditions are the same as in the first embodiment, the difference is that part (3) in the above example is the stage of charging the remaining furnace materials.

[0062] After the material flow trajectory test is completed, the measuring equipment is removed, and the charging process of the remaining furnace material is completed as planned. Due to the needs of the front and rear processes of the blast furnace, it is required that the ignition time of the furnace should be set after 10 hours, so the blast furnace is blown with cold air. In order to prevent coke from being ignited during the blast process, the temperature of the cold air is controlled at 200°C, and the pressure difference of the blast furnace is controlled to be ≤0.13MPa in order to prevent pulverization of the charge, and the blast volume is 1800m 3 / min, (the normal air volume of the blast furnace is about 4000), according to the planned charging ta...

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Abstract

The invention provides a method for loading materials by blowing in a blast furnace. The method is characterized by sequentially dividing a blast furnace material loading process into a furnace cylinder and middle-lower furnace body part material loading stage, a material flow trace testing stage and a residual furnace burden loading stage according to the time sequence, wherein in the furnace cylinder and middle-lower furnace body part material loading stage, cold air is blown to the blast furnace; in the material flow trace testing stage, the blast furnace is subjected to damping down to perform a material flow trace test, and materials are distributed by an ore coal clamping distribution method in the material flow trace testing process; and in the residual furnace burden loading stage, air is blown into the blast furnace. According to the method, the materials are loaded on the middle-lower part of a furnace body with wind and are then loaded to a fixed material line, and a material flow trace is tested in a concentrated manner by a laser method; in the material flow trace testing process, the materials are distributed by the ore coal clamping distribution method; after the material flow trace test is finished, the materials are loaded to a ruled material line by a winded material loading method. The method for loading the materials by blowing in the blast furnace is favorable for natural material loading and quick recovery of air volume after blowing-in ignition.

Description

technical field [0001] The invention relates to the technical field of blast furnace production, and more specifically, relates to a method for opening and charging a blast furnace. Background technique [0002] Whether the blast furnace starts smoothly or not is directly related to whether the blast furnace can successfully reach the rated economic and technical indicators and the service life of the first generation furnace within the specified time, which is a comprehensive manifestation of various technologies. Furnace charging is not simply to fill the furnace material below the blast furnace material line. What is more important is to distribute the ore coke in the required position according to the reasonable gas flow distribution requirements of the blast furnace. Provides unobstructed gas flow channels. [0003] Since most of the existing blast furnaces adopt bellless top equipment, it is necessary to measure the material flow trajectory every time the furnace is s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/00
Inventor 石军黄云陆高峰
Owner PANGANG GRP XICHANG STEEL & VANADIUM CO LTD