Dry recovery method of partial molten iron-steelmaking coal gas of arc furnace

A recycling method and electric arc furnace technology, applied in electric furnaces, furnaces, gas dust removal, etc., can solve the problems of unrecycled gas, environmental pollution, energy waste, etc., and achieve the benefits of recycling safety and quality, reducing pollution and reducing investment. Effect

Inactive Publication Date: 2010-08-04
周建安
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production is carried out through the post-combustion method or directly discharged into the atmosphere after dust removal, and the gas has not been recycled, resulting in a large waste of energy and polluting the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] An electric arc furnace with a production rate of 100t / h, a molten iron ratio of 40%, a smelting cycle of 45 minutes, and an oxygen blowing time of 12 minutes. The amount of flue gas directly discharged from the electric arc furnace is about 9×10 4 N m 3 / h.

[0022] The dry recovery method of electric arc furnace steelmaking gas is as follows.

[0023] (1) Pressure adjustment

[0024] During the oxygen blowing decarburization period of the electric arc furnace, the speed of the induced draft fan is adjusted by frequency conversion to ensure a slight positive pressure (20Pa) in the furnace to control the air intake.

[0025] (2) Flue gas cooling and dust removal

[0026] The 1300°C high-temperature flue gas passes through the electric arc furnace dog house into the vaporization cooling flue for cooling. After cooling, the flue gas enters the evaporative cooling tower and cyclone dust collector through the high-temperature flue for efficient cooling, dust removal and ...

Embodiment 2

[0030] An electric arc furnace with a production rate of 100t / h, a molten iron ratio of 50%, a smelting cycle of 40 minutes, and an oxygen blowing time of 14 minutes. The amount of flue gas directly discharged from the electric arc furnace is about 10×10 4 N m 3 / h.

[0031] The dry recovery method of electric arc furnace steelmaking gas is as follows.

[0032] (1) Pressure adjustment

[0033] During the oxygen blowing decarburization period of the electric arc furnace, the speed of the induced draft fan is adjusted by frequency conversion to ensure a slight positive pressure (50Pa) in the furnace to control the air intake.

[0034] (2) Flue gas cooling and dust removal

[0035] The 1400°C high-temperature flue gas enters the vaporization cooling flue through the electric arc furnace dog house for cooling. After cooling, the flue gas enters the evaporative cooling tower and cyclone dust collector through the high-temperature flue for efficient cooling, dust removal and spar...

Embodiment 3

[0039] An electric arc furnace with a production rate of 60t / h, a molten iron ratio of 40%, a smelting cycle of 55 minutes, and an oxygen blowing time of 14 minutes. The amount of flue gas directly discharged from the electric arc furnace is about 6×10 4 N m 3 / h.

[0040] The dry recovery method of electric arc furnace steelmaking gas is as follows.

[0041] (1) Pressure adjustment

[0042] During the oxygen blowing decarburization period of the electric arc furnace, the speed of the induced draft fan is adjusted by frequency conversion to ensure a slight positive pressure (0.01Pa) in the furnace to control the air intake.

[0043] (2) Flue gas cooling and dust removal

[0044] The 1200°C high-temperature flue gas enters the vaporization cooling flue through the fourth hole of the electric arc furnace for cooling. After cooling, the flue gas enters the evaporative cooling tower and cyclone dust collector through the high-temperature flue for efficient cooling, dust removal...

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Abstract

The invention relates to a dry recovery method of partial molten iron-steelmaking coal gas of an arc furnace. The method comprises the following steps: when molten iron is added in the arc furnace and oxygen-blowing and decarburization are performed, the micro-positive pressure in the arc furnace is ensured, then exhaust gas is cooled, dedusted and performs spark collection, the temperature is reduced to 150-180 DEG C, the dust content is not more than 30mg/Nm<3>; clean exhaust gas is sent to a coal gas switching station, if meeting the recovery conditions, the exhaust gas is sent to a coal gas cooling tower, the coal gas is cooled and then sent to a gas chamber, then a coal gas pumping station is used to pressurize and send the coal gas to each user; and if not meeting the recovery conditions, the exhaust gas is ignited and discharged through an emission chimney. The invention is characterized in that the process flow is simple, the existing devices can be fully used, the coal gas resource of arc furnace steel making can be effectively recovered, the recovery rate is not less than 80%, the economic benefit of the smelting enterprise is increased, and the air pollution caused by coal gas is reduced.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a treatment method for gas generated during part of the molten iron steelmaking metallurgical process of an electric arc furnace. Background technique [0002] Electric arc furnace (EAF) steelmaking has become an important part of the modern iron and steel industry, an important means of social waste recycling, and a link in the development of circular economy. [0003] In recent years, the trend of using molten iron to replace scrap steel in electric arc furnaces has increased significantly. At present, most large-tonnage electric arc furnaces (above 60 tons of electric arc furnaces) have adopted this part-added molten iron smelting process, and the ratio of molten iron is getting higher and higher. From 30% in the past to 35% to 60% now, even higher, 70% to 80% (basically the same as the converter smelting process). At the same time, with the rapid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C10K1/02
CPCY02P10/20
Inventor 周建安戚德录李旭徐茂清周鹏
Owner 周建安
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