Specialized metallurgical processes – compositions for use therei – Processes – Process control responsive to sensed condition
Patent
1996-08-28
1998-05-05
Andrews, Melvyn
Specialized metallurgical processes, compositions for use therei
Processes
Process control responsive to sensed condition
75500, 75571, 266222, 266268, C21B 1314
Patent
active
057468044
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus for burning and melting fine particles containing combustible carbon and a method for melting such fine particles using the apparatus, and more particularly to a fine particle melting apparatus having a triple tube structure capable of improving the melting/agglomeration ratio of fine particles and a fine particle melting method using the apparatus.
2. Description of the Prior Art
Generally, iron foundries employ a melting device for melting fine particles containing combustible materials in the manufacture of pig iron or steel. In the manufacture of pig iron, for example, a smelting reduction process is carried out using a smelting reduction furnace. Coal is charged in the smelting reduction furnace in which oxygen is also blown to produce reducing gas. In the smelting reduction furnace, ore reduced in a pre-reduction furnace arranged above the smelting reduction furnace is melted by heat generated during the production of reducing gas. A large amount of dust is contained in the reducing gas of the smelting reduction furnace. Subsequently, the reducing gas is burned and the dust is melted by a burning/melting device. In the burning/melting device, fine particles of iron ore and gangue contained in the reducing gas are melted and agglomerated, so that they will fall down into the smelting reduction furnace. In such a manner, the loss of raw materials is reduced.
One technique relating to the melting device is Austrian Patent Publication No. AT-B-381,116 which discloses a coal burning device having a double tube structure including a central tube and an outer tube. This device burns coal fed thereto through the central tube using oxygen or air blown therein through the outer tube.
Where such a device having the double tube structure is applied to the process for melting fine particles, however, there is a problem that the combustion of fine coal particles is generated from the outer portion of the combustion flame because it is enabled only when the coal particles come into contact with the oxygen blown through the outer tube, so that no combustion will be generated at the center of the particle flow. Moreover, when this device is used to melt fine particles containing a small amount of carbon, the particle melting efficiency is degraded.
SUMMARY OF THE INVENTION
Therefore, an object of the invention is to provide an apparatus for melting fine particles containing carbon, capable of uniformly burning and melting the fine particles throughout the entire zone of the combustion flame.
Another object of the invention is to provide a method for melting fine particles containing carbon, capable of efficiently burning and melting the fine particles using the above-mentioned melting apparatus.
In accordance with the present invention, the first object is accomplished by an apparatus for melting fine particles containing carbon, which has a triple tube structure capable of blowing air, oxygen-rich air or pure oxygen in the central flow of fine particles upon burning and melting the fine particles so that a combustion can be achieved even at the central particle flow, thereby not only eliminating any non-combustible zone, but also achieving a uniform temperature distribution throughout the entire zone of the combustion flame. This apparatus enhances the combustion efficiency for combustible materials and maximizes the melting and agglomeration of non-combustible particles.
In accordance with the present invention, the second object is accomplished by a method for melting fine particles which appropriately limits the flow rate of inert gas used for feeding fine particles, and the flow rate and total amount of oxygen or air blown for the combustion of the fine particles.
In accordance with one aspect, the present invention provides an apparatus for melting fine particles containing carbon, comprising: an inner oxygen feeding section including an inner oxygen inlet tube connected at a rear end thereof to an air/oxygen
REFERENCES:
patent: 4385753 (1983-05-01), Leroy et al.
patent: 4728360 (1988-03-01), Hauk et al.
patent: 4887800 (1989-12-01), Hotta et al.
patent: 5599375 (1997-02-01), Gitman
Joo Sang Hoon
Min Dong Joon
Shin Myoung Kyun
Andrews Melvyn
Pohang Iron & Steel Co. Ltd.
Research Institute of Industrial Science & Technology
Voest-Alpine Industriean-lagenbau GmbH
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