Burner isolation valve for pulverized fuel systems
First Claim
1. In combination with a coal delivery pipe between a delivery source and a burner in a combustion chamber, a burner isolation valve comprising:
- a valve housing intersecting the pipe and having a passage corresponding substantially to the flow area of the pipe;
a valve plate movable between a closed position in the housing covering the passage, and an open position removed from the passage, the improvement comprising a seal mechanism mounted on an interior surface of the housing in surrounding coextensive relationship to the passage and spaced from the valve plate, the seal mechanism including an inflatable seal inflated against an opposing interior surface of the housing around the passage to seal the passage from a remainder of the housing when the valve plate is in the open position.
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Accused Products
Abstract
A burner isolation valve or gate for use in the coal-delivery pipes of coal-fired power plants. Safety regulations often require that two valves be placed in the coal delivery line between a combustion chamber and an exhauster or pulverizer type deliver source to isolate the section of pipe in between for maintenance and other access. The invention includes a novel valve plate and actuation assembly, a novel housing adapted to sealingly enclose the valve plate, and a novel sealing mechanism for the valve plate and housing adapted to keep coal fines and dust out of the outboard portion of the housing in which the valve plate rests in the valve-open position.
44 Citations
21 Claims
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1. In combination with a coal delivery pipe between a delivery source and a burner in a combustion chamber, a burner isolation valve comprising:
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a valve housing intersecting the pipe and having a passage corresponding substantially to the flow area of the pipe;
a valve plate movable between a closed position in the housing covering the passage, and an open position removed from the passage, the improvement comprising a seal mechanism mounted on an interior surface of the housing in surrounding coextensive relationship to the passage and spaced from the valve plate, the seal mechanism including an inflatable seal inflated against an opposing interior surface of the housing around the passage to seal the passage from a remainder of the housing when the valve plate is in the open position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. In combination with a delivery pipe passing a mixed flow of air and particulate matter such as ground coal fines between a delivery source and a receiving source, an isolation valve comprising:
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a valve housing intersecting the pipe and having a passage corresponding substantially to the flow area of the pipe;
a valve plate movable between a closed position in the housing covering the passage, and an open position removed from the passage, the improvement comprising a seal mechanism mounted on an interior surface of the housing in surrounding coextensive relationship to the passage, the seal mechanism including an inflatable seal inflated against an opposing interior surface of the housing around the passage to seal the passage from a remainder of the housing when the valve plate is in the open position. - View Dependent Claims (19, 20)
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21. In combination with a coal delivery pipe between a delivery source and a burner in a combustion chamber, a burner isolation valve comprising:
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a valve housing intersecting the pipe and having a passage corresponding substantially to the flow area of the pipe;
a valve plate movable between a closed position in the housing covering the passage, and an open position removed from the passage, the improvement comprising an annular seal mechanism on the housing in annular surrounding relationship to the passage, the annular seal mechanism including an annular, inflatable seal adapted to be inflated against an interior surface of the housing around the passage to seal the passage from a remainder of the housing when the valve plate is in the open position, an annular portion of the valve plate in the valve closed position occupying a space normally occupied by the inflated seal in the valve open position, the annular portion of the valve plate being adapted to be sealed by the inflatable seal in the valve closed position.
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Specification