Exhaust hood overflow system
AssigneeGpre IP, LLC
InventorsJohn M. Peterman, Mark A. Roberts
Life of this patent
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Abstract
An overflow system for a doorway exhaust hood on a metal melt furnace having an eductor gas circulator. The system includes a manifold with an inlet near the hood's lower lip, and a conduit between the manifold and eductor. A blower draws gas into the manifold and urges that gas through the conduit, into the eductor, and into the furnace. Sensors detect when the door is open and the volatiles level under the hood. An electronic controller instructs the blower to draw exhaust gases through the manifold when the door is open and the volatiles level exceeds a predetermined level.
Claims20
An exhaust hood overflow system for a metal melt furnace, said furnace having a volatizing chamber, said furnace having a doorway with a door opening into said volatizing chamber and an exhaust hood positioned proximate said doorway, said door having a CLOSED condition said door is sealed against said doorway and an OPEN condition when said door is not sealed against said doorway, said exhaust hood having a lower lip with a portion separated from said doorway, said exhaust hood overflow system comprising:
- a. A gas manifold having a gas inlet, said gas manifold positioned at least in part under said exhaust hood with said gas inlet positioned proximate said exhaust hood lower lip separated portion;
- b. A gas port opening into said furnace;
- c. A gas conduit providing gaseous communication between said gas manifold and said gas port;
- d. A gas blower operatively associated with said gas collection apparatus, said gas blower drawing gas from said gas manifold and urging said gas through said gas conduit, and into said furnace through said gas port;
- e. An electronic sensor positioned proximate said hood, said electronic sensor detecting a possible gas overflow condition under said hood, said electronic sensor generating an electronic signal indicative of said condition;
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- f. An electronic controller operatively associated with said gas blower and with said electronic sensor, said electronic controller adapted to operate said gas blower, said electronic controller receiving said electronic signal from said electronic sensor and turning on said gas blower in response to said electronic signal when said electronic signal indicates a possible gas overflow condition.
An exhaust hood overflow system for a metal melt furnace, said furnace having a volatizing chamber, said furnace having a doorway with a door opening into said volatizing chamber and an exhaust hood positioned proximate said doorway, said door having a CLOSED condition said door is sealed against said doorway and an OPEN condition when said door is not sealed against said doorway, said exhaust hood having a lower lip with a portion separated from said doorway, said exhaust hood overflow system comprising:
- a. A gas flow path for a flow of gas from under said hood, said gas flow path comprising a gas manifold, a gas port opening into said furnace and a gas conduit providing gaseous communication between said gas manifold and said gas port, said gas manifold having a gas inlet, said gas inlet having a closable opening, said gas manifold being positioned at least in part under said exhaust hood with said gas inlet positioned proximate said exhaust hood lower lip separated portion;
- b. A gas blower positioned in said gas flow path, said gas blower drawing gas through said gas inlet and into said gas manifold from under said hood, and urging said gas through said gas conduit and into said furnace through said gas port;
- c. A gas flow regulator, said gas flow regulator positioned in said gas flow path, said regulator being adapted to dilate and to constrict said gas flow through said gas flow path;
- d. A sensor, said sensor detecting when said door is in its OPEN condition;
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- e. A controller operatively associated with said gas flow regulator and with said sensor, said controller instructing said gas flow regulator to dilate said gas flow when said sensor detects said door in said OPEN condition.
An exhaust hood overflow system for a metal recycling furnace, said furnace having a volatizing chamber and a heating chamber separated from said volatizing chamber, said furnace having a eductor gas circulation system with a variable speed gas blower collecting furnace exhaust gases from said volatizing chamber and directing said exhaust gases into said heating chamber, said furnace having a doorway opening into said volatizing chamber with an exhaust hood positioned proximate said doorway, said door having a CLOSED condition in which said door is sealed against said doorway and an OPEN condition in which said door is not sealed against said doorway, said hood having a lower lip with a portion separated from said doorway, said exhaust hood overflow system comprising:
- a. A gas manifold having a gas inlet, said gas manifold positioned at least in part under said exhaust hood with said gas inlet positioned proximate said exhaust hood lower lip separated portion;
- b. A gas conduit providing gaseous communication between said gas manifold and said eductor gas circulation system;
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- c. Said eductor gas circulation system blower drawing gas through said gas inlet and into said gas manifold from under said exhaust hood, and urging said gas through said gas conduit and into said eductor gas circulation system.
Dependencies are inferred from the claim text.