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US 6,802,268 B2Granted
Device for discharging dust from a dry dust collector of a blast furnace
AssigneePaul Wurth S.A.
InventorsYvan Kroemmer, Norbert Coone
Life of this patent
Estimating the term…
Abstract
A device for discharging dust from a dry dust collector of a blast furnace includes a dust discharge vent located downstream of a dust discharge opening of the dry dust collector. A fully enclosed dust conveying system is located downstream of the dust discharge valve and provides mechanized transport of the dust discharged through the discharge valve. A control system is utilized to control the opening of the dust discharge valve in relation to the residual conveying capacity of the dust conveying system.
Claims18
A device for discharging dust from a dry dust collector of a blast furnace comprising:
- a dust discharge valve located downstream of a dust discharge opening of said dry dust collector;
- a fully enclosed dust conveying system located downstream of said dust discharge valve for providing mechanized transport of the dust discharged through said discharge valve;
- and
- a control system that is designed so as to control the opening of said dust discharge valve in function of the residual conveying capacity of the dust conveying system.
1 more element
The device as claimed claim in 1, wherein:
- said fully enclosed conveying system comprises a mechanical conveyor;
- and
- said control system is designed so as to control the opening of said dust discharge valve in function of the power absorbed by said mechanical conveyor.
The device as claimed claim in 2, wherein said fully enclosed mechanical conveyor is connected without any lock chamber to said dust discharge valve and the latter is connected without any lock chamber to said dust discharge opening of said dry dust collector.
The device as claimed claim in 1, wherein:
- said fully enclosed conveying system comprises a pneumatic conveying system;
- and
- said control system is designed so as to control the opening of said dust discharge valve in function of the pressure in said pneumatic conveying system.
The device as claimed claim in 4, wherein said pneumatic conveying system comprises:
- a dust storage hopper located near the blast furnace;
- a pneumatic conveying conduit connected between said dust discharge valve said dust storage hopper, for transporting the discharged dust from said dry dust collector to said dust storage hopper;
- a fluidizing hopper connected to said dust storage hopper;
- and
- injection means for injecting the fluidized dust into the blast furnace.
2 more elements
A device for discharging dust from a dry dust collector of a blast furnace comprising:
- a dust discharge valve located downstream of a dust discharge opening of said dry dust collector;
- a fully enclosed dust conveying system located downstream of said dust discharge valve for providing mechanized transport of the dust discharged through said discharge valve, said fully enclosed conveying system comprising a pneumatic conveying system;
- a control system that that controls the opening of said dust discharge valve as a function of a residual conveying capacity of the dust conveying system, said control system controlling the opening of said dust discharge valve as a function of the pressure in said pneumatic conveying system;
- a dust storage hopper located near the blast furnace;
- a pneumatic conveying conduit connected between said dust discharge valve said dust storage hopper, for transporting the discharged dust from said dry dust collector to said dust storage hopper;
- and
- a fluidizing hopper connected to said dust storage hopper;
- and
- injection means for injecting the fluidized dust into the blast furnace.
6 more elements
A device for discharging dust from a dry dust collector of a blast furnace comprising:
- a dust discharge valve located downstream of a dust discharge opening of said dry dust collector;
- a fully enclosed dust conveying system located downstream of said dust discharge valve for providing mechanized transport of the dust discharged through said discharge valve;
- a control system that controls the opening of said dust discharge valve as a function of a residual conveying capacity of the dust conveying system;
- a housing including an inlet opening, said inlet opening being bounded by a concave annular surface that lies on a first fictive cylinder having a horizontal central axis;
- a closing body mounted in said housing so that it can be pivoted around said horizontal central axis between a closed position and an open position, wherein said closing body has a convex cylindrical closing surface that lies on a second fictive cylinder, which has a diameter that is slightly smaller than the diameter of said first fictive cylinder;
- said closing body having a cutting edge that sweeps across said inlet opening when said closing body is pivoted between said closed position and said open position;
- and
- wherein said cutting edge has a concave shape.
5 more elements
A device for discharging dust from a dry dust collector of a blast furnace comprising:
- a dust discharge valve located downstream of a dust discharge opening of said dry dust collector;
- a fully enclosed dust conveying system located downstream of said dust discharge valve for providing mechanized transport of the dust discharged through said discharge valve;
- a control system that controls the opening of said dust discharge valve as a function of a residual conveying capacity of the dust conveying system;
- a housing including an inlet opening, said inlet opening being bounded by a concave annular surface that lies on a first fictive cylinder having a horizontal central axis;
- a closing body mounted in said housing so that it can be pivoted around said horizontal central axis between a closed position and an open position, wherein said closing body has a convex cylindrical closing surface that lies on a second fictive cylinder, which has a diameter that is slightly smaller than the diameter of said first fictive cylinder;
- and
- wherein said housing includes an inflatable seal ring, which is mounted around said concave annular surface so that it is pressed against said closing surface in said closed position when it is inflated, but spaced therefrom when it is deflated.
4 more elements
A device for discharging dust from a dry dust collector of a blast furnace comprising:
- a dust discharge valve located downstream of a dust discharge opening of said dry dust collector;
- a fully enclosed dust conveying system located downstream of said dust discharge valve for providing mechanized transport of the dust discharged through said discharge valve;
- a control system that controls the opening of said dust discharge valve as a function of a residual conveying capacity of the dust conveying system;
- a housing including an inlet opening, said inlet opening being bounded by a concave annular surface that lies on a first fictive cylinder having a horizontal central axis;
- a closing body mounted in said housing so that it can be pivoted around said horizontal central axis between a closed position and an open position, wherein said closing body has a convex cylindrical closing surface that lies on a second fictive cylinder, which has a diameter that is slightly smaller than the diameter of said first fictive cylinder;
- and
- wherein said housing includes an outlet opening in a ring made of metal carbide, wherein said ring is mounted in a ground plate below said closing body, so as to define a retaining shoulder for retaining a dust cushion on said ground plate around said outlet opening.
4 more elements
Dependencies are inferred from the claim text.