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Combustion control method for regenerative pulse heating furnace

A technology of pulse heating and control method, which is applied in the field of metallurgical production and can solve problems such as product performance fluctuations, unevenness, and overtemperature

Active Publication Date: 2013-08-21
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the reversing period is unreasonable, it will directly affect the energy-saving effect of regenerative combustion, and it will easily lead to overheating, so there is a problem of determining the best reversing period under the condition of ensuring the pumping rate; the flow rate and the reversing period are matched , the uniformity of the temperature field in the furnace must also be solved. If the burners put into operation are fixed, then the temperature fields near the working and non-working burners are not uniform.
When heating special steel grades, such as bearing steel, this inhomogeneity will lead to fluctuations in product performance in the same section, which is not conducive to stable control of product quality
At present, there is no ready-made technical means to solve this technical problem well

Method used

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  • Combustion control method for regenerative pulse heating furnace
  • Combustion control method for regenerative pulse heating furnace
  • Combustion control method for regenerative pulse heating furnace

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0094] The initial state of the lower section of the soaking section is that all 4 pairs of regenerative burners are working. Due to the change of rolling line rhythm, the heat demand is reduced. The technology of this patent is used for regenerative pulse combustion control:

[0095] First determine the regenerative pulse combustion control gear. According to the MV value 1497 (flow setting value) of the lower part of the soaking section obtained, and the maximum flow value 3742 at the bottom of the soaking section of the flow classification threshold value table, calculate the flow percentage=1497 / 3742=40%, this value and the classification The grade range values ​​in the threshold table are compared one by one to determine the current grade Lnew=3, thus also confirming that three pairs of burners need to be opened under this flow grade.

[0096] Then calculate the exhaust gas temperature curve. Using the heat storage box model, according to the parameters of the heat stora...

no. 2 example

[0101] The initial state of the lower part of the soaking section is that 3 pairs of regenerative burners are working. Due to the roll change of the rolling line, the heat demand is reduced. The technology of this patent is used to control the regenerative pulse combustion:

[0102] First determine the regenerative pulse combustion control gear. According to the MV value 1122 (flow setting value) of the lower part of the soaking section obtained, and the maximum flow value 3742 of the lower section of the soaking section of the flow classification threshold value table, the calculation flow percentage=1122 / 3742=30%, this value and the classification The values ​​in the threshold table are compared one by one to determine the current gear level Lnew=2, thereby also determining that two pairs of burners need to be opened under this flow level.

[0103] Then calculate the exhaust gas temperature curve. Using the heat storage box model, according to the parameters of the heat sto...

no. 3 example

[0108] The initial state of the lower section of the soaking section is that 2 pairs of regenerative burners are working. Due to the failure of the rolling line, the heat demand is reduced. The technology of this patent is used to control the regenerative pulse combustion:

[0109] First determine the regenerative pulse combustion control gear. According to the MV value 561 (flow setting value) at the bottom of the soaking section obtained, and the maximum flow value 3742 at the bottom of the soaking section of the flow classification threshold table, calculate the flow percentage=561 / 3742=15%, this value and the classification threshold The values ​​in the table are compared one by one to determine the current gear level Lnew=1, thereby also determining that a pair of burners need to be opened under this flow level.

[0110]Then calculate the exhaust gas temperature curve. Using the heat storage box model, according to the parameters of the heat storage pellets, the superfic...

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Abstract

The invention discloses a combustion control method for a regenerative pulse heating furnace. The combustion control method includes acquiring a set flow value of a current section and a flow grading threshold table specified by a technology, dividing the set flow value by the maximum flow value of the current section to acquire a set flow percentage, comparing the set flow percentage to the flow grading threshold table and determining a current new flow grade and the number of pairs of operating burners; computing a flue gas temperature curve corresponding to a given regenerative reversal cycle by the aid of a regenerative box model according to standard flue gas flow and the furnace gas temperature which correspond to the new flow grade; performing interpolation according to the regenerative box flue gas temperature specified by the technology and the flue gas temperature curve to determine a regenerative reversal cycle corresponding to the flue gas temperature; determining the number of operating burners, the total number of available burners in the section and a regenerative reversal cycle in the section according to the new flow grade and determining a regenerative pulse cycle and a grouping rolling process; and performing regenerative combustion control and regenerative pulse logic control according to the regenerative reversal cycle, the regenerative pulse cycle and the grouping rolling process.

Description

technical field [0001] The invention relates to the technical field of metallurgical production, in particular to a combustion control method for a heat storage pulse heating furnace. Background technique [0002] The regenerative heating furnace adopts high-temperature air combustion technology. The regenerative combustion technology is to increase the temperature of preheated air or gas through the heat storage of high-temperature flue gas to increase the theoretical combustion temperature of fuel, so that low calorific value gas can be used to achieve energy saving and reduction. A technique of sorting. This technology not only solves the problem that the conventional continuous heating furnace cannot reach a higher process temperature, but also can recover about 80% of the flue gas heat loss that accounts for about 30% of the thermal expenditure of industrial furnaces. The pollution caused by low-oxygen combustion is small. Improved heating quality and reduced oxidation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23N5/00
Inventor 吕立华陶曙明邓龙
Owner BAOSHAN IRON & STEEL CO LTD
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