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Blast furnace low-carbon ironmaking process

A blast furnace and process technology, which is applied in the field of blast furnace low-carbon ironmaking technology, can solve the problem that separation process is not easy to achieve separation, and achieve the effect of realizing high added value utilization and realizing blast furnace low-carbon smelting

Active Publication Date: 2022-05-31
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the blast furnace gas contains a large amount of N 2 , while N 2 Relative molecular mass (about 28) and boiling point (N 2 Boiling point -195.8°C, CO boiling point -191.5°C) are relatively close, the current conventional separation process is not easy to achieve N 2 Separation from blast furnace gas

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) at 1260m 3 Blast furnace smelting is taken as an example to illustrate, the Ar gas in the Ar gas storage cabinet is blown into the hot blast furnace along the cold air duct by the blower, and the blowing volume of Ar gas is 2251m 3 / min, oxygen is blended into the cold air duct in the front section of the hot blast stove, and the oxygen flow rate is 815m 3 / min, the total oxygen content is 26.6%;

[0018] (2) The oxygen-enriched Ar gas is heated by the hot blast stove and enters the tuyere of the blast furnace along the hot blast pipe. The hot blast temperature is set at 1100°C and the hot blast pressure is 350kpa;

[0019] (3) The generated furnace top gas passes through bag dust removal, pressure regulating valve group / TRT, gas purification (removal of organic substances such as benzene and naphthalene) and desulfurization equipment, and then enters the pressure swing adsorption equipment to separate and recover CO 2 , CO and Ar gas;

[0020] (4) CO 2 Sell ​​o...

Embodiment 2

[0025] (1) at 1260m 3 Take the blast furnace as an example, use the blower to blow the Ne gas in the Ne gas storage cabinet into the hot blast stove along the cold air duct, and the Ne gas blowing volume is 2251m 3 / min, oxygen is blended into the cold air duct in the front section of the hot blast stove, and the oxygen flow rate is 815m 3 / min, the total oxygen content is 26.6%;

[0026] (2) The oxygen-enriched Ne gas is heated by the hot blast stove and enters the tuyere of the blast furnace along the hot blast pipe. The hot blast temperature is set at 1100°C and the hot blast pressure is 350kpa;

[0027] (3) The generated furnace top gas goes through the bag dust removal, pressure regulating valve group / TRT, gas purification (removal of benzene, naphthalene and other organic substances) and desulfurization equipment, and then enters the cryogenic equipment to separate and recover CO 2 , CO and Ne gas;

[0028] (4) CO 2 Sell ​​or reuse as chemical synthesis raw materials...

Embodiment 3

[0033] (1) at 3000m 3 Blast furnace smelting is taken as an example to illustrate, the Ar gas in the Ar gas storage cabinet is blown into the hot blast furnace along the cold air duct by the blower, and the blowing volume of Ar gas is 4740m 3 / min, oxygen is mixed into the cold air duct in the front section of the hot blast stove, and the oxygen flow rate is 1593m 3 / min, the total oxygen content is 25.2%;

[0034](2) The oxygen-enriched Ar gas is heated by the hot blast stove and enters the tuyere of the blast furnace along the hot blast pipe. The hot blast temperature is set at 1150°C and the hot blast pressure is 430kpa;

[0035] (3) The generated furnace top gas passes through bag dust removal, pressure regulating valve group / TRT, gas purification (removal of benzene, naphthalene and other organic substances) and desulfurization equipment, and then enters the pressure swing adsorption equipment to separate and recover CO 2 , CO and Ar gas;

[0036] (4) CO 2 Sell ​​or r...

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PUM

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Abstract

The invention relates to a blast furnace low-carbon ironmaking process, and belongs to the technical field of blast furnace ironmaking production in the metallurgical industry. According to the technical scheme, after oxygen-enriched inert gas is heated through a hot blast stove, blast furnace blast smelting is conducted, the oxygen-enriched inert gas is mixed gas of inert gas and oxygen, and the oxygen accounts for 21%-35% of the volume of the mixed gas. The inert gas is one or more of helium (He), neon (Ne), argon (Ar), krypton (Kr) and xenon (Xe), and the air temperature is 1050-1250 DEG C. The method has the beneficial effects that the oxygen-enriched inert gas is used for replacing air for blast smelting of the blast furnace, so that the difficulty that N2 and CO in the blast furnace gas are not easy to separate can be solved from the source, and high-added-value utilization of the blast furnace gas and low-carbon smelting of the blast furnace are realized.

Description

technical field [0001] The invention relates to a blast furnace low-carbon ironmaking process, which belongs to the technical field of blast furnace ironmaking production in the metallurgical industry. Background technique [0002] At present, blast furnace ironmaking uses coke and pulverized coal as fuel. The air blower is used to send air into the hot blast stove to heat it above 1000°C, and then enter the blast furnace along the hot air pipe to burn coke and pulverized coal to generate heat and flue gas. Inside the blast furnace, it reacts chemically with the iron-containing materials used for blast furnace ironmaking, completes the reduction of metallic iron and forms molten iron, and produces a large amount of blast furnace gas at the same time. The molten iron is discharged from the iron hole in the hearth of the blast furnace, and the blast furnace gas is discharged from the top of the blast furnace. [0003] In the gas discharged from the top of the blast furnace, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/06C21B5/00
CPCC21B5/06C21B5/00Y02P10/20
Inventor 王兰玉张彩东么洪勇田志强胡启晨王小艾韩星刘占礼赵晓峰牛佳星邢力勇纪恒
Owner HEBEI IRON AND STEEL
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