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US 10,527,280 B2Granted
High organic concurrent decoating kiln
AssigneeNovelis Inc.
InventorEdwin L. Rauch
Life of this patent
Estimating the term…
Abstract
A high organic concurrent decoating kiln includes a low-oxygen zone and a high-oxygen zone. The disclosed kiln allows a gas low in free oxygen to be used in the initial stages of decoating, while a gas higher in free oxygen can be used in the final stages. The total amount of free oxygen used throughout the kiln, in particular at the upstream portion of the kiln, is kept low. Exhaust gas can be recirculated for use in a burner-fired chamber that provides the initial low-oxygen gas to the kiln.
Claims16
A decoating kiln, comprising:
- a rotating drum supported between a first chamber and a second chamber, the rotating drum comprising:
- an entry side for accepting metal scrap and a low-oxygen hot gas into the rotating drum;
- and
- an exit side for outputting decoated scrap from the rotating drum and accepting a high-oxygen hot gas into the rotating drum;
- an exhaust tube positioned within the rotating drum for exhausting a mixture of exhaust gas and entrained scrap;
- a cyclone coupled to the exhaust tube for separating the entrained scrap from the exhaust gas;
- an exit port coupled to the cyclone for exhausting the exhaust gas;
- and
- a high-oxygen hot gas entry duct in the second chamber configured to direct high-oxygen hot gas into the second chamber such that the high-oxygen hot gas enters the rotating drum at the exit side.
6 more elements
A decoating kiln, comprising:
- a rotating drum supported between a first chamber and a second chamber, the rotating drum comprising:
- an entry side for accepting metal scrap and a low-oxygen hot gas into the rotating drum;
- and
- an exit side for outputting decoated scrap from the rotating drum and accepting a high-oxygen hot gas into the rotating drum;
- an exhaust tube positioned within the rotating drum for exhausting a mixture of exhaust gas and entrained scrap;
- a cyclone coupled to the exhaust tube for separating the entrained scrap from the exhaust gas;
- an exit port coupled to the cyclone for exhausting the exhaust gas;
- and
- a high-oxygen hot gas entry duct in the second chamber configured to allow high-oxygen hot gas to enter the rotating drum at the exit side,
- wherein the decoating kiln further comprises:
- a multicyclone coupled to the exit port for separating particles from the exhaust gas;
- and
- a burner-fired chamber coupled to the multicyclone for accepting the exhaust gas and generating the low-oxygen hot gas.
10 more elements
Dependencies are inferred from the claim text.