Smelt spout for a recovery furance
AssigneeAsea Brown Boveri AG
InventorsChristopher J. Beveridge, Andrew K. Jones
Life of this patent
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Abstract
A smelt spout for a chemical recovery furnace comprises a trough of U-shaped profile fabricated as a casting in a nickel-chromium alloy containing a minor amount of niobium. A system incorporating the spout includes a cooling arrangement which delivers cooling air to the outside surface of the spout.
Claims8
A smelt spout for delivering smelt from a chemical recovery furnace, said spout comprising:
- a trough of U-shaped profile having a curved lower portion that is relatively thick in the central region thereof and tapers in thickness towards the upstanding limbs of the U-shape and fabricated as a casting of a nickel-chromium alloy.
A system for delivering smelt from a chemical recovery furnace, said system comprising at least one spout having an inlet end mounted in an opening of a wall of said furnace to channel smelt passing through said opening, said spout comprising a casting formed of a refractory and corrosion-resistant metal alloy, said system further including cooling means adapted to deliver a flow of cooling air against the outer surface of said spout, wherein the cooling means comprises a plenum positioned closely adjacent the outer surface of the spout and having passages directing said cooling air flow in opposite directions generally longitudinally of said spout and against said outer surface.
A chemical recovery furnace in combination with a smelt delivery system comprising at least one spout of U-shaped profile having a relatively thick curved lower section and thinner upwardly extending limbs, said spout having an inlet end that is mounted in an opening in a peripheral wall of the furnace to channel smelt passing through said opening, said spout comprising a casting formed of a refractory and corrosion-resistant metal alloy, said system including a cooling means adapted to deliver a flow of cooling air against the outer surface of said spout at least in a region adjacent the external side of said furnace wall.
The combination of claim 11 wherein said alloy has the composition
- chromium 48-52%
- niobium 1.4 to 1.7%
- with the balance being nickel, apart from minor amounts of trace elements and impurities.
Dependencies are inferred from the claim text.