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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 dedusting and other directions, can solve problems such as energy waste, gas not being recycled and polluting the environment, etc., to reduce pollution, be beneficial to recycling safety and quality, and save electricity. Effect

Inactive Publication Date: 2012-05-30
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 productivity of 100t / h, molten iron ratio of 40%, smelting cycle 45min, oxygen blowing time 12min, and the amount of flue gas directly discharged from the electric arc furnace is about 9×10 4 Nm 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 and 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℃ high temperature flue gas is cooled by the arc furnace dog house into the vaporization cooling flue. 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 spark capture, and the flue gas temperature drops to 150°C....

Embodiment 2

[0030] An electric arc furnace with a production rate of 100t / h, the ratio of molten iron is 50%, the smelting cycle is 40min, the oxygen blowing time is 14min, and the amount of flue gas directly discharged from the electric arc furnace is about 10×10 4 Nm 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 and 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℃ high temperature flue gas is cooled through the electric arc furnace dog house into the vaporization cooling flue. 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 spark capture, and th...

Embodiment 3

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

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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 method for processing coal gas generated in the metallurgical process of partial molten iron steelmaking in an electric arc furnace. Background technique [0002] Electric arc furnace (EAF) steelmaking has now become an important part of the modern steel industry, an important means of social waste recycling, and a link in the development of circular economy. [0003] In recent years, there has been a significant increase in the use of molten iron instead of scrap in electric arc furnaces. At present, most large-tonnage electric arc furnaces (above 60 tons of electric arc furnaces) adopt this smelting process with partial molten iron, and the ratio of molten iron is getting higher and higher. From the past 30% to the current 35%-60%, or even higher, 70%-80% (basically the same as the converter smelting process). At the same time, with the rapid development...

Claims

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Application Information

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Patent Type & Authority Patents(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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