Top oxygen gun blowing technology for electric furnace steel making

A technology of electric furnace steelmaking and top oxygen lance, applied in electric furnace, process efficiency improvement, furnace and other directions, can solve the problems of decarburization and slagging kinetic conditions gap, insufficient utilization of chemical energy, insufficient oxygen supply intensity, etc. , to achieve the effect of shortening smelting time, reducing smelting power consumption and high utilization rate

Inactive Publication Date: 2003-10-22
UNIV OF SCI & TECH BEIJING
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  • Summary
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AI Technical Summary

Problems solved by technology

[0002] At present, oxygen blowing in conventional electric furnace steelmaking mainly uses water-cooled oxygen lances on the furnace door and water-cooled oxygen lances on the furnace wall to blow oxygen to decarburize slag. There is a certain gap
The oxygen supply intensity is insufficient, the chemical energy is not fully utilized, and the utilization rate of oxygen is also lower compared with the converter

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] For an electric furnace with a tapping capacity of 30 tons, the condition of hot charging 40% of molten iron.

[0016] There is a hole on the furnace cover. The size of the hole is 200mm. The oxygen lance is lowered to a distance of 200-1000mm from the steel liquid level through an electric lifting mechanism. The oxygen lance adopts water cooling, and the oxygen jet adopts supersonic jet, Mach The number is 1.6-2.2, the number of oxygen lance nozzles is 1, and the oxygen flow rate is 800-3000Nm 3 / h, the oxygen pressure is 0.6-1.0Mpa. The flow of water in and out of the oxygen lance is 30t / h.

[0017] The design dimensions of the oxygen lance mainly include: 1. Copper-steel composite copper head, nozzle outer diameter 180mm, nozzle inner diameter 50mm, 2 oxygen pipeline, outer diameter 120mm, inner diameter 80mm.

[0018] The lifting mechanism of the oxygen lance can perform the functions of ascending and descending, and rotating the oxygen lance.

[0019] The lifting of th...

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PUM

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Abstract

The present invention belong to the field of metallurgical technology, in particular, it relates to an electric furnace steel-smelting oxygen gun converting process. It is characterized by that on the furnace cover of electric furnace an opened hole is set, the size of said opened hole is 50-500 nm, the oxygen gun can be fallen downward to a distance 200-1000 mm from molten steel surface by meansof a lifting mechanism to make decarbonization and slag-forming operation, said oxygen gun adopts water-cooling mode, its jet adopts supersonic jet, its Mach number is 1.6-2.2, oxygen gun nozzle number is 1-3, oxygen gas flow rate is 800-1000 N cu.m / h. oxygen gas pressure is 0.6-1.2 MPa, and water inlet and outlet flow rate of oxygen gun is 10-60 t / h, said oxygen gun has a copper-steel composite copper head.

Description

Technical field: [0001] The invention belongs to the field of iron and steel metallurgy, and particularly relates to an electric furnace steelmaking oxygen lance blowing process. Background technique: [0002] At present, the conventional electric furnace steelmaking oxygen blowing mainly uses the furnace door water-cooled oxygen lance and the furnace wall water-cooled oxygen lance to blow oxygen and decarburize slag. However, due to the influence of the electric furnace type, the dynamic conditions of decarburization and slagging are compared with that of the converter smelting. There is a certain gap. As a result, the strength of oxygen supply is insufficient, the chemical energy is not fully utilized, and the utilization rate of oxygen is lower than that of the converter. Especially after the electric furnace hot metal charging process is adopted, the decarburization speed of the electric furnace has become the main factor affecting the smelting rhythm. Summary of the inventi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52
CPCY02P10/20
Inventor 朱荣刘国权郭汉杰仇永全
Owner UNIV OF SCI & TECH BEIJING
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