Heating – Work chamber having heating means – Having means by which work is progressed or moved mechanically
Reexamination Certificate
1999-06-04
2001-04-17
Ferensic, Denise L. (Department: 3749)
Heating
Work chamber having heating means
Having means by which work is progressed or moved mechanically
C126S167000, C126S15200R
Reexamination Certificate
active
06217318
ABSTRACT:
FIELD OF THE INVENTION
The present specification refers to an improvement in a grate bar for pelletizing and sintering furnaces in order to attain a structural design provided with aerodynamic principles that allow for the reduction of the gas flow resistance and make it possible to reduce the bar mass so that each part may have the dimension required to perform the relevant function.
BACKGROUND OF THE INVENTION
Grate bars showing some structural features for attaining a better permeability with respect to the traditional shape of bars, thus aiming at increasing the gas passage area, are already commercially known and used.
Generally, such conventional bars have rectangular profiles including only short radiuses for rounding the edges. Said conventional construction shows some shortcomings, among which we have the fact that, in the event of a downward gas flow, when it passes through the slot between the bars there is an abrupt expansion of the section that causes a whirling after the lower bar edges with the consequent energy loss.
Another shortcoming of said conventional construction is related to the fact that the mass of the bars causes a thermal loss when the bars leave the furnace outlet and return cold to the inlet thereof.
Another shortcoming of said conventional construction is related to the fact that the whirling and the passageway area limitation cause a load loss between 9 and 14% of the total load loss of the pellet bed plus the bars in the burning area.
On trying to minimize such problems, that is, to generate a higher permeability to the gas flow, studies have shown the importance of an improvement in the design of the grate bar, including a lower cost.
Within this expectation, there appeared a new sound proposal for a grate bar provided with spacers below the bar higher face (thus expanding the length of the slot) with just one central spacer having a higher width and therefore with a greater number of slots.
OBJECTS OF THE INVENTION
Therefore, one of the objects of the present invention is to provide an improvement in a grate bar for pelletizing and sintering furnaces provided with innovating aerodynamic concepts in the structural conception thereof, thus being different from the conventionally known bars.
Another object of the present invention is to provide an improvement in a grate bar for pelletizing and sintering furnaces including an aerodynamic design and a mass only necessary to execute the functions for the performance of the bar.
Another object of the present invention is to provide an improvement in a grate bar for pelletizing and sintering furnaces that increases the permeability, thus making it possible to reduce the electric power consumption for maintaining the required gas flow in the process.
Another object of the present invention is to provide an improvement in a grate bar for pelletizing and sintering furnaces which allows for a production increase without the need to invest in the remodeling of the ventilation system.
Another object of the present invention is to provide an improvement in a grate bar for pelletizing and sintering furnaces which, with the mass reduction, brings about a decrease in the price of each bar as well as a reduction in the furnace heat power consumption.
These and other objects and advantages of the present invention are attained by an improvement in a grate bar for pelletizing and sintering furnaces comprised of a single body provided with escape edges (sharp edges) in the central spacers thereof; also comprised of a lower escape edge in the central portion of its body; wherein the latter is provided with a rounded section of its upper and lower side spacers, thus matching with the side of the grate bar beam; said single body having a greater higher length of its slot and a greater lower length between its “legs”; said “legs” bringing about a reduction in the side section and a mass reduction in the higher and lower side spacers of said bar.
REFERENCES:
patent: 4002148 (1977-01-01), Harding
patent: 4610209 (1986-09-01), Temelli
patent: 5081939 (1992-01-01), Esser
patent: 5245983 (1993-09-01), Krieger
De Giovanni Pache De Faria Marcelo
Leite Marques José Fernando
Companhia Vale Do Rio Doce
Ferensic Denise L.
Helfgott & Karas P.C.
Wilson Gregory A.
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