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Smelting method for melting gasifier

A melting gasification furnace and smelting method technology, applied in the field of smelting reduction smelting technology, can solve the problems that cannot be effectively solved, and the COREX pure oxygen tuyere is easy to be damaged.

Active Publication Date: 2014-03-05
XINJIANG BAYI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To sum up, the easy breakage problem of COREX pure oxygen tuyere 1 has been plagued by major iron and steel enterprises using the smelting reduction ironmaking process, and has never been effectively solved

Method used

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  • Smelting method for melting gasifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] When the percentage content of nitrogen in the reduced gas is 1.5%, the basic furnace condition parameters and the composition of the furnace fuel are shown in Table 1 and Table 2:

[0040] Table 1 Basic Furnace Condition Parameters

[0041]

Melting ratet / h

Fuel ratio kg / tHM

Oxygen content of tuyere Nm3 / h

parameters

120

1000

48000

[0042] Table 2 Industrial and chemical analysis of fuels, wt%

[0043]

[0044] According to the formula (2), it can be calculated: the percentage N of nitrogen in the gas blown from the tuyere r 2%.

[0045] According to formula (1) and formula (3), the theoretical combustion temperature is 3813°C, which is 25°C lower than the 3838°C when nitrogen is not mixed. In the test, the tuyere was not damaged for 3 consecutive months.

Embodiment 2

[0047] When the percentage of nitrogen in the reduced gas is 3.5%, the basic furnace condition parameters and the composition of the furnace fuel are shown in Table 3 and Table 4:

[0048] Table 3 Basic Furnace Condition Parameters

[0049]

Melting ratet / h

Fuel ratio kg / tHM

Oxygen content of tuyere Nm3 / h

parameters

120

1000

48000

[0050] Table 4 Industrial and chemical analysis of fuels, wt%

[0051]

[0052] According to the formula (2), it can be calculated: the percentage N of nitrogen in the gas blown from the tuyere r 5%.

[0053] According to formula (1) and formula (30), the theoretical combustion temperature is 3774°C, which is 64°C lower than 3838°C when nitrogen is not used. In the test, the tuyere was not damaged for 4 consecutive months.

Embodiment 3

[0055] When the percentage of nitrogen in the reduced gas is 5%, the basic furnace condition parameters and the composition of the furnace fuel are shown in Table 5 and Table 6:

[0056] Table 5 Basic Furnace Condition Parameters

[0057]

Melting ratet / h

Fuel ratio kg / tHM

Oxygen content of tuyere Nm3 / h

parameters

120

1000

48000

[0058] Table 6 Industrial and chemical analysis of fuels, wt%

[0059]

[0060] According to the formula (2), it can be calculated: the percentage N of nitrogen in the gas blown from the tuyere r 10%.

[0061] According to formula (1) and formula (3), it can be calculated that the theoretical combustion temperature is 3706°C, which is 132°C lower than 3838°C when nitrogen is not used. In the test, the tuyere was not damaged for 4 consecutive months.

[0062] In summary, the melting method of the present invention has the following advantages:

[0063] 1. Blowing nitrogen and oxygen into the g...

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Abstract

The invention discloses a smelting method for a melting gasifier. The smelting method for the melting gasifier comprises the steps of filling raw fuels, setting a tuyere oxygen lance and performing reduction smelting while generating coal gas through combustion, and further comprises the steps of feeding nitrogen through a nitrogen feeding pipeline, mixing the nitrogen with oxygen and blowing the mixture into the furnace through a tuyere so as to control and lower the temperature of a tuyere area, reduce damage of the tuyere of a pure oxygen blasting smelting furnace and prolong the service life of the tuyere.

Description

technical field [0001] The invention relates to a smelting reduction smelting process, in particular to a smelting method of a melting gasifier. Background technique [0002] see figure 1 As shown, in the smelting reduction ironmaking process (hereinafter referred to as COREX), since the oxygen lance 3 is connected to the tuyere 1 and the pure oxygen blast is carried out through the oxygen pipeline 4, the oxygen flow rate of the tuyere 1 is smaller than that of the blast furnace hot air (Oxygen-enriched) blast, resulting in a decrease in the kinetic energy of the blast. According to the empirical formula for the depth of the COREX swing zone 2, the depth of the tuyere swing zone 2 is only about 0.7 to 0.8 meters, which is less than the depth of the swing zone 2 of about 1.5 meters for a hot blast (oxygen-enriched) blast furnace with the same hearth diameter. At the same time, since COREX uses pure oxygen blast, its theoretical combustion temperature at tuyere 1 is as high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B11/00
Inventor 林金嘉熊林李建朱锦明况志华胡双柏徐万仁周海忠
Owner XINJIANG BAYI IRON & STEEL
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