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Auxiliary burner for electric furnace

A technology of burners and electric furnaces, which is applied in the direction of burners, gas fuel burners, combustion of gaseous fuels and powder fuels, etc. It can solve the problems of poor thermal efficiency, fast combustion of solid fuels, and misfires, and achieve the effect of improving the heating effect

Active Publication Date: 2019-04-02
JFE STEEL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in Patent Documents 1 and 2, there is a problem that the object of fuel is limited to expensive gaseous fuel.
Inexpensive fuels include solid fuels such as coal, but in general, it is difficult to burn solid fuels faster than gaseous fuels, and it may catch fire depending on the conditions. It is difficult to use solid fuels for combustion-supporting burners
In addition, if the particle size of the solid fuel is large, it cannot be completely burned in the flame of the burner, and there is also a problem that the thermal efficiency is very poor.

Method used

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  • Auxiliary burner for electric furnace
  • Auxiliary burner for electric furnace
  • Auxiliary burner for electric furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] use Figure 1 to Figure 4 The combustion-supporting burner of the structure shown above heated the iron plate, and the temperature measurement of the iron plate was performed. The combustion conditions of the burner are shown in Table 1.

[0087] The fuel uses LNG (gas fuel) and coal powder (solid fuel), and the combustion-supporting gas uses pure oxygen. Nitrogen is used as the conveying gas, and pulverized coal is injected from the central solid fuel injection tube, and LNG is injected from the gas fuel injection tube outside the solid fuel injection tube, and the combustion-supporting gas is injected from the outside (outermost circumference) of the gas fuel injection tube. The injection pipe injects pure oxygen. The specifications of pulverized coal are shown in Table 2.

[0088] Table 3 shows the angle θ of the rotary vane in the combustion-supporting gas injection pipe in each level 1 , The angle θ of the rotating vane in the gas fuel injection pipe 2 , Q 1 ...

Embodiment 2

[0108] use Figure 5 ~ Figure 7 The combustion-supporting burner of the shown structure heated the iron plate, and the temperature measurement of the iron plate was performed. The combustion conditions of the burner (Table 1), the gas fuel used, the solid fuel (Table 2) and the combustion-supporting gas, the method of the combustion test ( Figure 10 ), evaluation of test results etc. are the same as [Example 1].

[0109] Table 4 shows the angle θ of the rotating vane in the gaseous fuel injection pipe in each level 2 and Q 2 / P 2 value. In addition, the turning vane at an angle of 0° is not provided for turning the gas fuel, but is provided as a member for holding the solid fuel injection pipe 1 and the gas fuel injection pipe 2 concentrically. In addition, the number of rotating blades is 8 in all levels, L B2 40mm, P 2 is 30mm.

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Abstract

Provided is an auxiliary burner for an electric furnace, the burner being capable of increasing and homogenizing the heating effect of iron scrap by suitably and efficiently burning solid fuel along with gas fuel. This auxiliary burner 100 for an electric furnace comprises, in the stated order from the center side, a solid fuel injection tube 1, a gas fuel injection tube 2, and a combustion-supporting gas injection tube 3, all arranged coaxially, and is characterized in that: a flow path 30 of the combustion-supporting gas injection tube 3 is provided with a plurality of turning blades 4 for turning the combustion-supporting gas, and a flow path 20 of the gas fuel injection tube 2 is provided with a plurality of turning blades 5 for turning the gas fuel; and the angle [theta]1 of the turning blades 4 and the angle [theta]2 of the turning blades 5 satisfy the relationship [theta]1<[theta]2.

Description

technical field [0001] The present invention relates to a combustion-supporting burner attached to an electric furnace for melting iron filings to produce molten iron. Background technique [0002] When using an electric furnace to melt iron filings, although the iron filings around the electrodes melt quickly, the iron filings far away from the electrodes, that is, at cold spots, melt slowly, and the melting speed of iron filings in the furnace is uneven. Therefore, the melting rate of iron filings at cold spots is limited during the entire operating time in the furnace. [0003] Therefore, in order to eliminate the inhomogeneity of the melting speed of such iron filings and to melt the entire iron filings in the furnace in a balanced manner, a combustion-supporting burner is installed at the cold spot, and the iron filings at the cold spot are treated by the combustion-supporting burner. A method of preheating, cutting, and melting. [0004] As such a combustion-supporti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23D14/24F23C1/12F23D17/00F27B3/08F27D3/16F27D7/02
CPCF23C1/12F23D14/24F23D17/005F27B3/08F27D3/16F27D7/02F23D91/02F27B3/16F23D17/00
Inventor 堤康一三轮善广小泽纯仁鹫见郁宏友泽健一伊藤贵之
Owner JFE STEEL CORP
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