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Method for assisting in controlling carbon content of molten iron in cupola furnace

An auxiliary control and cupola technology, applied in the direction of various fluid ratio control, etc., can solve the problems of difficulty in adjusting the carbon content of molten iron and the inability to predict changes in the carbon content of molten iron.

Inactive Publication Date: 2021-07-20
潍柴(潍坊)材料成型制造中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the 35t / h cupola smelting process, when the cupola is fully operating, the cupola can hold 60 tons of iron material. If the molten iron is flowed out and the carbon content is detected by thermal analysis and carbon-sulfur meter, it will lag behind the cupola production, resulting in It is difficult to adjust the carbon content of molten iron
However, the prediction of the carbon content of molten iron based on the batching conditions is restricted by the change of the cupola furnace condition and the change of the furnace charge, so it cannot predict the change of the carbon content of the molten iron very well.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] During the smelting process of the cupola furnace, the furnace charge is 65% scrap steel plus 35% recycled material, the layer coke amount is 420kg, and the melting air volume is 15000m 3 / h, in the continuous smelting process, the C content of molten iron detected by thermal analysis is 3.23%, which meets the process requirements. The CO content in the furnace gas is detected as 10.2% by infrared gas analyzer, so the melting air volume is pre-adjusted according to the CO content, according to formula 1 , the air volume after adjustment is 13200m 3 / h, that is, air volume = 15000m 3 / h[1-(12%-10.2%)*100*1000m 3 / h], after adjusting the air volume for ten minutes, observe that the CO content in the furnace gas rises to 10.5%, and then continue to maintain 13200m 3 / h air volume for melting, the CO content in the furnace gas increased to 12.7% after 1.5 hours of melting, at this time, the detected molten iron C content was 3.24%, and the recovery melting air volume was ...

Embodiment 2

[0026] During the smelting process of the cupola furnace, the charge is 60% scrap steel plus 40% recycled charge, the amount of layer coke is 400kg, and the melting air volume is 15000m 3 / h, in the continuous smelting process, the C content of molten iron detected by thermal analysis is 3.24%, which meets the process requirements, and the CO content in the furnace gas is detected as 9.7% by infrared gas analyzer, so the melting air volume is pre-adjusted according to the CO content, according to formula 1 , the air volume after adjustment is 12700m 3 / h, that is, air volume = 15000m 3 / h[1-(12%-9.7%)*100*1000m3 / h], after adjusting the air volume for ten minutes, it was observed that the CO content in the furnace gas did not increase but decreased to 9.2%, so continue to adjust the air volume to 12200m 3 / h, that is, air volume = 15000m 3 / h[1-(12%-9.2%)*100*1000m 3 / h], after adjusting the air volume for 10 minutes, observe that the CO content in the furnace gas rises to 9...

Embodiment 3

[0028] During the smelting process of the cupola furnace, the furnace charge is 63% scrap steel plus 37% recycled material, the layer coke amount is 460kg, and the melting air volume is 16000m 3 / h, in the continuous smelting process, thermal analysis is used to detect that the C content of molten iron is 3.29%, which meets the process requirements. The infrared gas analyzer is used to detect the CO content in the furnace gas as high as 18.2%, and the melting air volume is pre-adjusted according to the CO content. According to formula 2, The air volume after adjustment is 20000m 3 / h, that is, air volume = 16000m 3 / h[1+(15.3%-14%)*100*1000m 3 / h], after adjusting the air volume for ten minutes, it was observed that the CO content in the furnace gas did not decrease but increased to 18.4%, so the layer coke was reduced to 440kg, and the CO content was still 18.3% after melting for 1 hour, so continue to reduce the layer coke is 420kg, and the CO content is reduced to 17.6% a...

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Abstract

The invention discloses a method for assisting in controlling the carbon content of molten iron in a cupola furnace. In the continuous melting process of the cupola furnace, the CO content of furnace gas is controlled between 12% and 14%, the air volume of the cupola furnace is kept between 15000 m<3> / h and 16000 m<3> / h, and the proportioning ratio of furnace burden to coke charge amount is kept unchanged. The molten iron carbon content is predicted in an auxiliary mode by detecting the CO content in the furnace gas, so that regulation and control of the cupola furnace are more real-time, the change trend of the molten iron carbon content can be judged in time in the smelting process of the cupola furnace, smelting parameters are adjusted, it is guaranteed that the molten iron carbon content meets the technological requirements, and the operation stability of the cupola furnace is improved.

Description

technical field [0001] The invention relates to a method for assisting in controlling the carbon content of cupola molten iron. Background technique [0002] During the cupola smelting process, the detection of the carbon content of molten iron relies on thermal analyzers and carbon-sulfur meters. The prediction of the carbon content change of the cupola smelting molten iron can only be carried out depending on the ingredients. The carbon content change trend of the molten iron can be predicted by calculating the carbon content of various iron materials and the bottom coke and layer coke of the cupola furnace. During the 35t / h cupola smelting process, when the cupola is fully operating, the cupola can hold 60 tons of iron material. If the molten iron is flowed out and the carbon content is detected by thermal analysis and carbon-sulfur meter, it will lag behind the cupola production, resulting in It is difficult to adjust the carbon content of molten iron. However, the pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/08C22C33/08G05D11/02
CPCC21C1/08C22C33/08G05D11/02
Inventor 乔进国鲍俊敏孙长伟王仕春王安家
Owner 潍柴(潍坊)材料成型制造中心有限公司
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