CATALYTIC BURNER SYSTEM FOR DPF REGENERATION

1 . A catalytic burner system for use in regeneration of a filter in an exhaust system on a diesel engine, the burner system comprising:

a burner diesel oxidation catalyst (BDOC) having an inlet for receiving an exhaust flow from the diesel engine and an outlet at an opposing end;

a mixer fluidly coupled to the outlet of the BDOC;

a diesel oxidation catalyst (DOC) fluidly coupled to the mixer; and,

a diesel particulate filter (DPF) fluidly coupled to the DOC, wherein the BDOC channels the exhaust flow through the mixer, the DOC and the DPF during a regeneration cycle of the DPF under low engine temperature operating conditions.

2 . The system of claim 1 , wherein the BDOC further includes a collar positioned at the inlet of the BDOC.

3 . The system of claim 2 , wherein the collar has a conical shape including a narrower opening and a wider outlet.

4 . The system of claim 3 , wherein the collar directs the exhaust flow through the BDOC at a pre-determined flow rate.

5 . The system of claim 1 , wherein the BDOC has a conical shape, having a narrower inlet channeling the exhaust flow toward a wider outlet.

6 . The system of claim 1 , wherein the BDOC comprises a first substrate and a second substrate, wherein the second substrate is positioned downstream from the first substrate.

7 . The system of claim 6 , wherein the first substrate comprises a plurality of wider channels and the second substrate comprises of plurality of narrow channels.

8 . The system of claim 7 , wherein the first substrate and the second substrate are separated by a gap, wherein the gap enhances mixing of the exhaust flow between the first substrate and the second substrate.

9 . A method for regenerating a diesel engine particulate filter (DPF) during periods of low engine operating temperatures, the method comprising the steps of:

channeling a portion of exhaust flow toward a first chamber;

restricting the flow velocity of the exhaust flow as it enters the chamber;

expanding the flow velocity of the exhaust flow as it leaves the chamber;

catalytically oxidizing the exhaust flow in a second chamber;

maintaining a pre-determined regeneration temperature between the first chamber and the second chamber; and,

regenerating the DPF.

10 . The method of claim 9 , wherein the first chamber comprises a burner diesel oxidation catalyst (BDOC).

11 . The method of claim 9 , wherein the step of restricting the flow velocity includes the first chamber comprising a BDOC having a conical shape.

12 . The method of claim 9 , wherein the step of restricting the flow velocity includes the first chamber comprising a BDOC comprising a first substrate having a plurality of wide channels and a second substrate having a plurality of narrower channels.

13 . The method of claim 9 , wherein the second chamber comprises a DOC.

14 . A method for regenerating a diesel engine particulate filter during periods of low engine operating temperatures, the method comprising the steps of:

fluidly coupling components of an exhaust gas treatment system package to an engine exhaust system of the diesel-engine vehicle;

channeling the flow of exhaust gases through the components of the treatment system package; and,

maintaining a pre-determined temperature for regeneration.

15 . The method of claim 14 , wherein the step of channeling the flow of exhaust gases comprises providing a burner diesel oxidation catalyst (BDOC) having a narrow inlet fluidly connected to an outlet wider relative to the inlet.

16 . The method of claim 15 , wherein the BDOC further includes a conical collar positioned at the inlet of the BDOC, the conical collar restricting the flow of exhaust gases into the exhaust gas treatment system package.

17 . The method of claim 14 , wherein the step of channeling the flow of exhaust gases comprises providing a burner diesel oxidation catalyst (BDOC) comprising a conical shape having a narrow inlet and a wider outlet for restricting the flow of exhaust gases into the exhaust gas treatment system.

18 . The method of claim 14 , wherein the step of channeling the flow of exhaust gases comprises providing a burner diesel oxidation catalyst (BDOC) comprising a first substrate having a plurality of wide channels and a second substrate having a plurality of narrower channels, wherein the second substrate is positioned downstream from the first substrate.

19 . The method of claim 14 , wherein the step of maintaining a pre-determined temperature for regeneration comprises providing a DOC.

20 . A catalytic burner system for use in regeneration of a particulate filter in an exhaust system on a diesel engine, the burner system comprising:

means for channeling a portion of exhaust flow; and,

means for maintaining a pre-determined temperature for filter regeneration at low operating temperatures.

21 . The catalytic burner system of claim 20 , wherein the means for channeling the exhaust flow comprises a first chamber having a conical collar.

22 . The catalytic burner system of claim 20 , wherein the means for channeling the exhaust flow comprises a first chamber having a conical shape with a narrow inlet and a wider outlet.

23 . The catalytic burner system of claim 20 , wherein the means for channeling the exhaust flow comprises a first chamber constructed from a first substrate having a plurality of wide channels and a second substrate having a plurality of narrower channels, wherein the second substrate is positioned downstream from the first substrate.

24 . The catalytic burner system of claim 20 , wherein the means for maintaining a pre-determined temperature for filter regeneration at low operating temperatures comprises a second chamber.