Abatement

Patent metadata

Field	Value
Publication number	US-12158266-B2
Application number	US-201917296101-A
Country	US
Kind code	B2
Filing date	Nov 21, 2019
Priority date	Nov 22, 2018
Publication date	Dec 3, 2024
Grant date	Dec 3, 2024

Abstract

An abatement method is disclosed. The method comprises: supplying a combustion chamber of an abatement apparatus with an effluent stream containing a perfluoro compound, together with combustion reagents and a diluent; heating a combustion zone of said combustion chamber by reacting said combustion reagents to perform abatement of said perfluoro compound to stable by-products, said diluent being selected to remain inert during said abatement. In this way, the perfluoro or other compound is abated in the combustion chamber during the combustion of the combustion reagents, but without creating undesirable compounds such as, for example, NOx or other compounds.

First claim

The invention claimed is:

1. A method, comprising:
supplying a combustion chamber of an abatement apparatus with an effluent stream containing a perfluoro compound, together with combustion reagents and a diluent comprising a mixture of a noble gas and carbon dioxide, wherein a percentage of carbon dioxide in the mixture is set equal to or less than twenty percent by volume while allowing for pumping of the diluent without overheating a pump;
heating a combustion zone of said combustion chamber by reacting said combustion reagents to perform abatement of said perfluoro compound to stable by-products, said diluent being selected to remain inert during said abatement.

2. The method of claim 1 , wherein said heating raises a temperature of said combustion zone to greater than 1000° C.

3. The method of claim 1 , wherein said abatement apparatus comprises a nozzle for injecting a gas stream into said combustion chamber and said supplying comprises supplying said nozzle with said effluent stream, said combustion reagents and said diluent.

4. The method of claim 3 , wherein the pump supplies said nozzle and said supplying comprises supplying said diluent as a pump purge gas.

5. The method of claim 1 , wherein said abatement apparatus comprises a foraminous sleeve at least partially defining said combustion chamber for conveying a gas into said combustion chamber and said supplying comprises supplying said foraminous sleeve with said combustion reagents and said diluent.

6. The method of claim 1 , comprising adjusting a ratio of flow rates of said diluent to said combustion reagents to provide a selected minimum destructive rate efficiency of at least one compound in said effluent stream.

7. The method of claim 1 , wherein said combustion reagents comprise a fuel and an oxidant.

8. The method of claim 7 , wherein said fuel comprises at least one of a hydrocarbon, methane, propane, and butane.

9. The method of claim 7 , wherein said oxidant comprises at least one of oxygen, and ozone.

10. The method of claim 7 , wherein said oxidant is mixed with carbon dioxide in a ratio of around 35% oxidant to around 65% carbon dioxide by volume.

11. The method of claim 7 , wherein said oxidant is mixed with carbon dioxide in a ratio of around 37.5% oxidant to around 63.5% carbon dioxide by volume.

12. The method of claim 7 , wherein said oxidant is mixed with argon in a ratio of around 20% to around 80% argon by volume.

13. The method of claim 7 , wherein said fuel is mixed with carbon dioxide in a ratio of around 8% fuel to around 92% carbon dioxide by volume.

14. The method of claim 7 , wherein said fuel is mixed with combined oxidant and argon in a ratio around 4.5% fuel to around 95.5% combined oxidant and argon by volume.

15. The method of claim 1 , wherein said noble gas comprises argon.

16. The method of claim 1 , wherein said diluent comprises a mixture of argon and carbon dioxide in a ratio of around 80% of argon to around 20% of carbon dioxide by volume.

17. The method of claim 1 , comprising recovering and/or recirculating at least some of said diluent from an exhaust stream of said combustion chamber and/or comprising recirculating said diluent together with at least one of said oxidant and said fuel as a contaminant to said combustion chamber.

Assignees

• Edwards Ltd

Inventors

• Seeley Andrew James
• Gray Fraser

Classifications

• F23D14/12

  Radiant burners · CPC title

• F23L2900/07005

  Injecting pure oxygen or oxygen enriched air · CPC title

• F23L2900/07002

  Injecting inert gas, other than steam or evaporated water, into the combustion chambers · CPC title

• F23G2900/00001

  Exhaust gas recirculation · CPC title

• F23G2209/142

  Halogen gases, e.g. silane · CPC title