Method and apparatus for top-charging solid waste into a molten metal bath

• US 5,571,486 A
• Filed: 05/16/1995
• Issued: 11/05/1996
• Est. Priority Date: 04/02/1993
• Status: Expired due to Fees

• Current Assignee: Quantum Catalytics LLC
• Original Assignee: Molten Metal Technology Incorporated
• Inventors: Nagel, Christopher J., Griffin, Thomas P., Robert, Edgar J., Howie, F. James III
• Primary Examiner(s): MCMAHON, TIMOTHY M
• Application Number:
  US08/442,024
• Time in Patent Office: 539 Days
• Field of Search: 422/184, 422/168, 266/46, 266/189, 588/201, 110/235
• US Class Current: 422/184.1
• CPC Class Codes: A62D 2203/10 Apparatus specially adapted for treating harmful chemical agents; Details thereof
• CPC Class Codes: B01J 10/005 carried out at high temperatures in the presence of a molten material
• CPC Class Codes: B01J 2219/0009 Coils
• CPC Class Codes: B01J 2219/00123 adding a temperature modifying medium to the reactants
• CPC Class Codes: B01J 2219/00155 using insulating materials or refractories
• CPC Class Codes: B01J 4/002 Nozzle-type elements nozzle-type reactors B01J19/26
• CPC Class Codes: B01J 8/003 in a downward flow
• CPC Class Codes: C21C 2005/4666 for charging with organic contaminated scrap
• CPC Class Codes: C21C 5/466 Charging device for converters
• CPC Class Codes: F27D 3/0025 Charging or loading melting furnaces with material in the solid state
• CPC Class Codes: F27D 3/10 Charging directly from hoppers or shoots
• CPC Class Codes: F27M 2001/05 Waste materials, refuse

Abstract

A method and apparatus for top-charging a solid waste into a molten metal bath to form a dissociation product are disclosed. The method includes introducing the waste into the molten metal bath through a refractory tube disposed in a reactor, containing the molten metal bath, through which the refractory tube extends. A gas outlet is disposed above the molten metal bath. The refractory tube has a submergible end which is immersed in the molten metal bath and which defines a lower opening at the terminal end of the refractory tube and an elevated opening, whereby a portion of the molten metal bath enters the refractory tube through the lower opening to allow the molten metal bath to remain within the refractory tube while at least partially dissociating the waste to form the dissociation product in the molten metal bath. An oxidizing agent can be directed into the molten metal bath at a rate sufficient to form an gaseous oxygenated product which is discharged from the reactor.

Claims

1. An apparatus for top-charging solid waste into a molten metal bath contained in a reactor, wherein the solid waste is dissociated into dissociation products which are subsequently oxidized to form a gaseous oxygenated product comprising:

a) a reactor having a reactor outlet disposed above the molten metal bath; and

b) a refractory tube extending within the reactor, through which said solid waste can be introduced into the molten metal bath, said refractory tube having a submergible end for immersion into the molten metal bath, the submergible end having a lower opening at a terminal portion of the submergible end and at least one elevated opening, whereby a portion of the molten metal bath enters the refractory tube through the lower opening for dissociating the waste and for forming the oxygenated product, the gaseous oxygenated product passing out of the refractory tube through said elevated opening end being discharged from the reactor through the reactor outlet.

2. The apparatus of claim 1 further including oxygenating means for directing an oxidizing agent into the molten metal bath which reacts with the dissociation product to form the gaseous oxygenated product.

3. The apparatus of claim 2 wherein the oxygenating means is proximate to the refractory tube, whereby the dissociation product is substantially oxidized in the molten metal bath.

4. The apparatus of claim 3 wherein the elevated opening includes at least one slot.

5. The apparatus of claim 3 wherein the elevated opening includes at least one perforation.

6. The apparatus of claim 5 wherein the perforations are at an angle of less than 90°

from vertical.

7. The apparatus of claim 6 wherein the refractory tube further includes a hydrocarbon inlet above the elevated opening.

8. The apparatus of claim 7 wherein the refractory tube further includes an inert gas inlet above the elevated opening.

9. The apparatus of claim 7 wherein the refractory tube further includes an oxygen gas inlet above the-elevated opening.

10. The apparatus of claim 9 further including means for heating the waste near the inlet of said refractory tube.

11. The apparatus of claim 10 wherein said means for heating includes an oxyfuel burner.

12. The apparatus of claim 10 wherein the heat source means includes a carbon dioxide plasma torch.

13. The apparatus of claim 3 wherein the refractory tube is retractable.

14. The apparatus for top-charging solid waste into a molten metal bath contained in a reactor, wherein the solid waste is dissociated into dissociation products which are subsequently oxidized to form a gaseous oxygenated product comprising:

a) a reactor having a reactor outlet disposed above the molten metal bath;

b) a refractory tube extending within the reactor, through which said solid waste can be introduced into the molten metal bath, said refractory tube having a submergible end for immersion into the molten metal bath, the submergible end having a lower opening at a terminal portion of the submergible end and at least one elevated opening, whereby a portion of the molten metal bath enters the refractory tube through the lower opening for dissociating the waste and for forming the oxygenated product, the gaseous oxygenated product passing out of the refractory tube through said elevated opening end being discharged from the reactor through the reactor outlet; and

c) means for heating the waste near the inlet of said refractory tube.

15. The apparatus of claim 14 wherein said means for heating includes an oxyfuel burner.

16. The apparatus of claim 14 wherein the heat source means includes a carbon dioxide plasma torch.

17. The apparatus of claim 14 further including oxygenating means for directing an oxidizing agent into the molten metal bath which reacts with the dissociation product to form the gaseous oxygenated product.

18. The apparatus of claim 17 wherein the oxygenating means is proximate to the refractory tube, whereby the dissociation product is substantially oxidized in the molten metal bath.

19. The apparatus of claim 18 wherein the elevated opening includes at least one slot.

20. The apparatus of claim 18 wherein the elevated opening includes at least one perforation.

21. The apparatus of claim 19 wherein the refractory tube further includes a hydrocarbon inlet above the elevated opening.

22. The apparatus of claim 21 wherein the refractory tube further includes an inert gas inlet above the elevated opening.

23. The apparatus of claim 21 wherein the refractory tube further includes an oxygen gas inlet above the elevated opening.

24. The apparatus of claim 14 wherein the refractory tube is retractable.