Oxygen-enriched blast furnace blow-in method

A blast furnace, oxygen technology, applied in blast furnace, blast furnace detail, furnace, etc., can solve problems such as long reaction cycle, low calorific value of gas, high fuel consumption, etc.

Active Publication Date: 2022-05-03
XINJIANG BAYI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the start-up process of the traditional blast furnace, there are difficulties in the initial hearth heat storage process, low calorific value of gas, large fluctuations in gas utilization rate, and insufficient indirect reduction process. Blast furnace workers usually The furnace is started

Method used

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  • Oxygen-enriched blast furnace blow-in method

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Embodiment approach

[0025] A method for opening an oxygen-enriched blast furnace, comprising the following steps:

[0026] S1. Oven work:

[0027] 1) The air mixing valve is fully open to supply cold air. After air supply, the furnace top pressure is set to 10kpa, and the air volume is set to 300m3 / min;

[0028] 2) After the air temperature and air volume are stable, manually adjust the air mixing valve to control the actual air temperature rise according to the heating curve, and the temperature at the front end of the air outlet shall prevail. The heating curve is as figure 1 shown.

[0029] After the supply air temperature is stable at 150°C, the air volume is specified at 400-500m 3 / min; when the supply air temperature is greater than 400°C, the specified air volume is 500m 3 / min; when the air supply temperature is less than or equal to 400°C during the cooling period, the air volume is specified as 400m 3 / min and keep it until the end of cooling, in the process of heating or adding a...

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Abstract

The blowing-in method comprises the following steps: filling furnace charge after the furnace is dried, blowing and heating nitrogen at a tuyere for preheating, then feeding hot coal gas and oxygen at the tuyere, controlling the theoretical combustion temperature at 2350-2400 DEG C, and tapping when the theoretical iron amount in a hearth reaches 60% of the normal safe iron capacity; then, the in-furnace load is gradually increased, the in-furnace reduction gas amount and oxygen amount are increased, normal tapping and in-furnace load adjustment are organized, and the theoretical combustion temperature in the stage is 2400-2500 DEG C; according to the invention, heated nitrogen is used for purging materials, quickly and effectively drying and increasing the temperature of the materials, a blast furnace gas system is inerted, heated reducing gas and high-temperature and high-reducibility gas are injected into a tuyere, enter the furnace, immediately undergo a reduction reaction with upper furnace charge, and are combusted with injected oxygen to release a large amount of heat, so that the temperature of a hearth can be quickly increased; blow-in time is shortened, and raw fuel consumption is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular relates to a blast furnace opening method for oxygen-enriched gas injection. Background technique [0002] In the opening of a traditional blast furnace, sinter, pellets, coke and solvent are formed into the charge in a certain proportion. The charge is added to the furnace from the top of the furnace, and hot air is blown into the blast furnace tuyere. Heat transfer occurs when the charge moves in contact with the hot air in the blast furnace. It reacts with redox to generate gas, which moves upward from the riser and leaves the blast furnace. During the reaction, the blast furnace material melts and drops into molten iron and slag, and the liquid slag iron is discharged from the blast furnace from the iron hole. In the process of traditional blast furnace opening, there are difficulties in the initial hearth heat storage process, low gas calorific value, large...

Claims

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Application Information

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IPC IPC(8): C21B5/00
CPCC21B5/00Y02P10/20
Inventor 田宝山田庄刘永想
Owner XINJIANG BAYI IRON & STEEL
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