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Method for increasing CO content of converter gas

A converter gas and converter technology, applied in the field of iron and steel metallurgy and steelmaking, can solve the problem of low CO content in converter gas, achieve the effects of increasing CO content, reducing free oxygen, and increasing gas recovery time

Inactive Publication Date: 2020-08-25
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of low CO content in existing converter gas, the present invention provides a method for increasing CO content in converter gas

Method used

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  • Method for increasing CO content of converter gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 100 tons of oxygen top-bottom re-blowing gas recovery method, a batch of FeO-containing cold material 685kg / t steel needs to be added in the early stage of smelting. The amount of FeO-containing cold material added in the middle stage of smelting is 657kg / t steel. Include the following steps:

[0044] 1) The silicon content of molten iron into the furnace is 0.40%, the manganese content is 0.2%, the converter lowering gun is blown, the gun position is 1500mm, and the oxygen flow rate is 18000m 3 / h, add a batch of FeO-containing cold material 685kg / t steel while blowing.

[0045] 2) Add 1000kg of raw dolomite 2 minutes after the converter is turned on, and perform gas recovery.

[0046] 3) After raw dolomite is added, the oxygen flow rate drops to 16920m 3 / h, gun position down to 1420mm, blowing to 4 minutes to return to normal oxygen flow and gun position (gun position 1500mm, oxygen flow 18000m 3 / h).

[0047] 4) From 5 minutes before blowing to 2 minutes before...

Embodiment 2

[0051] 200 tons of oxygen top-bottom re-blowing gas recovery method, a batch of FeO-containing cold material 1370kg / t steel needs to be added in the early stage of smelting; the addition amount of FeO-containing cold material in the middle stage of smelting is 1314kg / t steel. Include the following steps:

[0052] 1) The silicon content of molten iron into the furnace is 0.40%, and the manganese content is 0.2%. 3 / h, add a batch of FeO-containing cold material 1370kg / t steel while blowing.

[0053] 2) Add 2000kg of raw dolomite 2 minutes after the converter is turned on, and perform gas recovery.

[0054] 3) After raw dolomite is added, the oxygen flow rate drops to 33120m 3 / h, gun position down to 1650mm, blowing to 4 minutes to return to normal oxygen flow and gun position (gun position 1800mm, oxygen flow 36000m 3 / h).

[0055] 4) From 5 minutes before blowing to 2 minutes before oxygen stop, add 1314kg / t steel containing FeO cold material in 4 batches.

[0056] 5) Fr...

Embodiment 3

[0059] 100 tons of oxygen top-bottom re-blowing gas recovery: a batch of FeO-containing cold material 685kg / t steel needs to be added in the early stage of smelting; the amount of FeO-containing cold material added is 657kg / t steel in the middle stage of smelting. Include the following steps:

[0060] 1) The silicon content of molten iron into the furnace is 0.40%, the manganese content is 0.2%, the converter lowering gun is blown, the gun position is 1500mm, and the oxygen flow rate is 18000m 3 / h, add a batch of FeO-containing cold material 685kg / t steel while blowing.

[0061] 2) Add 1000kg of raw dolomite 2 minutes after the converter is turned on, and perform gas recovery.

[0062] 3) After raw dolomite is added, the oxygen flow rate drops to 17280m 3 / h, gun position down to 1450mm, blowing to 4 minutes to return to normal oxygen flow and gun position (gun position 1500mm, oxygen flow 18000m 3 / h).

[0063] 4) From 5 minutes before blowing to 2 minutes before oxygen ...

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Abstract

The invention relates to a method for increasing the CO content of converter gas, and belongs to the technical field of ferrous metallurgy steelmaking. The method comprises the following steps of 1) adding a batch of FeO-containing cold charge while blowing the converter; 2) blowing the converter for 1.5-2.0 minutes, and adding raw dolomite accounting for 1 / 3 of the total amount of the lime; 3) after the raw dolomite is added, reducing the lance position and the oxygen supply flow; 4) adding a FeO-containing cold material 3 minutes before blowing and 2 minutes before stopping oxygen supply; 5)reducing the lance position and the oxygen supply flow 1.5-2 minutes before smelting to stop oxygen supply, and 6) finishing the coal gas recovery time from 2 minutes before smelting to 0.5 minute before stopping oxygen supply. The method can prolong the coal gas recovery time, improve the CO content and the coal gas calorific value in the flue gas, and reduce the energy consumption of the steelmaking process.

Description

technical field [0001] The invention relates to a method for increasing the CO content of converter gas, belonging to the technical field of iron and steel metallurgy and steelmaking. Background technique [0002] Converter gas is an important secondary energy source for iron and steel enterprises. Increasing the recovery of converter gas can not only effectively reduce the production cost of the steelmaking process, lay the foundation for the realization of "negative energy" steelmaking, but also effectively reduce the total amount of pollutant emissions from steel mills. Realize cleaner production. [0003] Although the existing technology can improve the slag system and control the pressure of the oxygen lance position to realize early slag removal and advance the converter gas recovery time. By optimizing the oxygen supply system and reasonably controlling the position of the oxygen lance, the amount of gas recovery can be increased. However, it is difficult to increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/35C21C5/36
CPCC21C5/28C21C5/35C21C5/36
Inventor 任科社张昭平杨普庆谭学样王玉春
Owner SHANDONG IRON & STEEL CO LTD
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