Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Patent
1993-07-26
1994-09-27
Andrews, Melvyn J.
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
266221, 266268, C21B 716
Patent
active
053504399
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
In numerous techniques, solid particles are sent to a utilization station in a carrier or conveying gas. Thus, numerous processes of combustion use an injection of combustible solid in pulverized form conveyed by a gas, typically air or nitrogen. At the utilization station, it is frequently desirable to treat the particles in another gaseous environment than the conveying gas. For example, in combustion processes, the outputs are greatly improved by enrichment of the combustible with oxygen. Thus, the combustion of pulverized carbon injected into a blast furnace is greatly improved in the presence of air enriched with oxygen or pure oxygen. However, in a continuous process, it is not possible to burn the pulverulent solid without diluting the combustible with the conveying gas. In particular, the combustion in pure oxygen of the carbon is impossible if the supply device .for the pulverized solid does not also operate with pure oxygen, which is impossible for safety reasons. Another problem resides in the time necessary for the mixing in situ of the flow of solid particles with the combustible gas. In practice, a dense jet of pulverulized solid disperses poorly and a portion of the particles is not contacted with the combustible gas under the required conditions.
SUMMARY OF THE INVENTION
The present invention has exactly for its object to provide a process permitting the rapid separation, without mechanical means, and continuously, of a flow of solid particles and a conveying gas flow at the inlet of a reaction region supplied with a gas of controlled composition as well as the substantially instantaneous mixing of the flow of solid particles and of the gas of controlled composition by replacement of the flow of conveying gas.
To do this, according to a characteristic of the invention, such a replacement process of a first gas flow accompanying a flow of solid particles by a second gas flow, comprises the steps of sending the first gas flow at supersonic speed and the flow of particles in a first direction, causing them to intersect, in an interaction zone, with the second gas flow sent in a second direction forming an angle with the first, deflecting the first gas flow in a direction substantially parallel to the second direction and the second gas flow substantially in the first direction to accompany the flow of particles whose path has not been substantially changed.
The present invention also has for its object an apparatus to practice this process, comprising a first conduit extending in a first direction, connected upstream to a first source of gas under pressure and injection means for solid particles, a second conduit, connected upstream to a second source of gas under pressure and intersecting the first conduit at an angle in an interaction zone, a third conduit in prolongation of the first conduit beyond the zone of interaction, and a fourth conduit intersecting the first conduit in the zone of interaction and forming with the third conduit a nose for separating flow, directed toward the second conduit.
BRIEF DESCRIPTION OF THE DRAWINGS
Other characteristics and advantages of the present invention will become apparent from the following description of embodiments, given for illustration but not at all limiting, with respect to the accompanying drawings, in which:
FIG. 1 is a schematic view of an apparatus for practicing the process according to the invention; and
FIG. 2 is a schematic view of a modified embodiment of the invention.
DETAILED DESCRIPTION OF THE INVENTION
In the description which follows and in the drawings, identical or analogous elements bear the same reference numerals.
In FIG. 1, there is shown a first conduit 1 conducting a flow of solid particles S introduced upstream by an injection device 2 connected to a particle supply 3, and a conveying gas flow C from a first source of gas under pressure 4. The flows S and C are accelerated in a nozzle such that the speed of the gas in the conduit 1 will be supersonic, the speed of the solid particle
REFERENCES:
patent: 4363656 (1982-12-01), Ponghis et al.
Andrews Melvyn J.
L'Air Liquide Societe Anonyme pour l'Etude et, l'Exploitation de
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