Emission abatement assembly and method of operating the same

• US 20050150221A1
• Filed: 08/31/2004
• Published: 07/14/2005
• Est. Priority Date: 01/13/2004
• Status: Active Grant

• Current Assignee: ET US Holdings LLC
• Original Assignee: ET US Holdings LLC
• Inventors: Johnson, Randall J., Crawley, Wilbur H.
• Granted Patent: US 7,628,011 B2
• Time in Patent Office: Days
• US Class Current: 60/295
• CPC Class Codes: F01N 3/025 using fuel burner or by adding fuel to exhaust
• CPC Class Codes: F23N 2237/02 two or more burners
• CPC Class Codes: F23N 2239/06 Liquid fuels
• CPC Class Codes: F23N 5/022 using electronic means F23N5/04 - F23N5/14 take precedence
• CPC Class Codes: Y10S 55/30 Exhaust treatment

Abstract

An emission abatement assembly includes a first particulate filter having a first fuel-fired burner associated therewith and a second particulate filter having a second fuel-fired burner associated therewith. A control unit controls operation of both the first fuel-fired burner and the second fuel-fired burner. A method of operating an emission abatement assembly is also disclosed.

Claims

1. An emission abatement assembly, comprising:

a first particulate filter having a first fuel-fired burner positioned upstream thereof,

a second particulate filter having a second fuel-fired burner positioned upstream thereof, and

a control unit configured to control operation of both the first fuel-fired burner and the second fuel-fired burner.

2. The emission abatement assembly of claim 1, wherein:

the control unit comprises an air pump and an air valve,

an outlet of the air pump is coupled to an inlet of the air valve,

a first outlet of the air valve is coupled to the first fuel-fired burner, and

a second outlet of the air valve is coupled to the second fuel-fired burner.

3. The emission abatement assembly of claim 1, wherein:

the control unit comprises a fuel delivery assembly, and

the fuel delivery assembly is configured to selectively deliver fuel to the first fuel-fired burner and the second fuel-fired burner.

4. The emission abatement assembly of claim 3, wherein the fuel delivery assembly comprises:

a first fuel injector operable to introduce fuel into the first fuel-fired burner, and

a second fuel injector operable to introduce fuel into the second fuel-fired burner.

5. The emission abatement assembly of claim 4, further comprising a housing, wherein the first fuel injector and the second fuel injector are positioned in the housing.

6. The emission abatement assembly of claim 4, wherein:

the control unit comprises an air pump and an air valve,

an outlet of the air pump is coupled to an inlet of the air valve,

a first outlet of the air valve is coupled to the first fuel-fired burner, and

a second outlet of the air valve is coupled to the second fuel-fired burner.

7. The emission abatement assembly of claim 6, further comprising a housing, wherein the air pump, the air valve, the first fuel injector, and the second fuel injector are positioned in the housing.

8. The emission abatement assembly of claim 6, further comprising an electronic controller, wherein the first fuel injector, the second fuel injector, the air pump, and the air valve are under the control of the electronic controller.

9. The emission abatement assembly of claim 8, further comprising a housing, wherein the electronic controller, the air pump, the air valve, the first fuel injector, and the second fuel injector are positioned in the housing.

10. An emission abatement assembly, comprising:

a first particulate filter having a first fuel-fired burner positioned upstream thereof,

a second particulate filter having a second fuel-fired burner positioned upstream thereof, and

a control unit having a housing and an air valve positioned in the housing, wherein a first outlet of the air valve is coupled to the first fuel-fired burner, and a second outlet of the air valve is coupled to the second fuel-fired burner.

11. The emission abatement assembly of claim 10, wherein:

the control unit has an air pump positioned in the housing, and

an outlet of the air pump is coupled to an inlet of the air valve.

12. The emission abatement assembly of claim 10, wherein:

the control unit has a fuel delivery assembly positioned in the housing, and

the fuel delivery assembly is configured to selectively deliver fuel to the first fuel-fired burner and the second fuel-fired burner.

13. The emission abatement assembly of claim 12, wherein the fuel delivery system comprises:

a first fuel injector operable to introduce fuel into the first fuel-fired burner, and

a second fuel injector operable to introduce fuel into the second fuel-fired burner.

14. The emission abatement assembly of claim 13, wherein the first fuel injector and the second fuel injector are positioned in the housing.

15. The emission abatement assembly of claim 13, further comprising an electronic controller, wherein the first fuel injector, the second fuel injector, and the air valve are under the control of the electronic controller.

16. The emission abatement assembly of claim 15, wherein the electronic controller is positioned in the housing.

17. A method of operating an emission abatement assembly, the method comprising the steps of:

operating an air pump to generate a flow of combustion air,

positioning an air valve in a first valve position to direct the flow of combustion air to a first fuel-fired burner during regeneration of a first particulate filter, and

positioning the air valve in a second valve position to direct the flow of combustion air to a second fuel-fired burner during regeneration of a second particulate filter.

18. The method of claim 17, further comprising the step of directing exhaust gas from a diesel engine through the first particulate filter and the second particulate filter.

19. The method of claim 17, further comprising the steps of:

operating a fuel delivery assembly to deliver fuel to the first fuel-fired burner during regeneration of the first particulate filter, and

operating the fuel delivery assembly to deliver fuel the second fuel-fired burner during regeneration of the second particulate filter.