Methods for testing a honeycomb filter

Patent metadata

Field	Value
Publication number	US-9523623-B2
Application number	US-201213687759-A
Country	US
Kind code	B2
Filing date	Nov 28, 2012
Priority date	Nov 28, 2012
Publication date	Dec 20, 2016
Grant date	Dec 20, 2016

Abstract

Methods of testing a honeycomb filter include the step of maintaining an average temperature of the honeycomb filter and/or fog within a range of from about 10° C. to about 30° C. and flowing a fog with moisture droplets into the honeycomb network of channels at the first end portion of the honeycomb filter, the fog including a relative humidity of at least 80%. In further examples, the moisture droplets include a mean droplet size of from about 1 micron to about 25 microns.

First claim

What is claimed is:

1. A method of testing a honeycomb filter comprising the steps of:
(I) providing a honeycomb filter including a first end portion and a second end portion along an axis of the honeycomb filter, the honeycomb filter including honeycomb network of channels defined by a plurality of intersecting porous walls, wherein the honeycomb network of channels extend along the axis of the honeycomb filter between the first end portion and the second end portion;
(II) maintaining an average temperature of the honeycomb filter within a range of from about 10° C. to about 30° C.;
(III) flowing a fog with moisture droplets into the honeycomb network of channels at the first end portion of the honeycomb filter; and
(IV) monitoring the second end portion of the honeycomb filter for moisture droplets of the fog exiting the honeycomb network of channels.

2. The method of claim 1 , wherein step (III) flows the fog at a pressure differential between the first end portion and the second end portion of from about 32 Pa to about 37 Pa.

3. The method of claim 1 , wherein step (III) flows the fog through honeycomb network of channels at a flow rate of from about 0.075 m/sec to about 0.1 m/sec.

4. The method of claim 1 , wherein after step (I) and prior to step (II), further comprising wetting at least one of the first end portion and the second end portion to provide at least one wetted end portion, wherein the wetted end portion has a higher degree of wetness than an intermediate portion disposed between the first end portion and the second end portion.

5. The method of claim 1 , wherein step (I) further includes providing the honeycomb filter with an outer peripheral surface circumscribing the honeycomb network of channels and extending between the first end portion and the second end portion, and the method further comprises wetting the outer peripheral surface of the honeycomb filter to enhance the flow of fog through outer peripheral channels of the honeycomb network of channels.

6. The method of claim 1 , further comprising the step of blocking a flow of fog through inner peripheral channels of the honeycomb network of channels to enhance the flow of fog through outer peripheral channels of the honeycomb network of channels.

7. The method of claim 1 , wherein the fog includes a relative humidity of at least 80%.

8. The method of claim 1 , wherein step (II) maintains the average temperature of the honeycomb filter within a range of from about 10° C. to about 25° C.

9. The method of claim 8 , wherein step (II) maintains the average temperature of the honeycomb filter within a range of from about 20° C. to about 23° C.

10. The method of claim 1 , wherein step (III) flows the fog with the moisture droplets having a mean droplet size of from about 1 micron to about 25 microns.

11. The method of claim 10 , wherein step (III) flows the fog with the moisture droplets having a mean droplet size of from about 5 microns to about 25 microns.

12. The method of claim 1 , wherein step (III) flows the fog with a temperature within a range of from about 10° C. to about 30° C.

13. The method of claim 12 , wherein step (III) flows the fog with a temperature within a range of from about 10° C. to about 25° C.

14. The method of claim 13 , wherein step (III) flows the fog with a temperature within a range of from about 23° C. to about 25° C.

15. A method of testing a honeycomb filter comprising the steps of:
(I) providing a honeycomb filter including a first end portion and a second end portion along an axis of the honeycomb filter, the honeycomb filter including honeycomb network of channels defined by a plurality of intersecting porous walls, wherein the honeycomb network of channels extend along the axis of the honeycomb filter between the first end portion and the second end portion;
(II) flowing a fog with moisture droplets into the honeycomb network of channels at the first end portion of the honeycomb filter, and the fog including a temperature within a range of from about 10° C. to about 30° C.; and
(III) monitoring the second end portion of the honeycomb filter for moisture droplets of the fog exiting the honeycomb network of channels.

16. The method of claim 15 , wherein step (III) flows the fog at a pressure differential between the first end portion and the second end portion of from about 32 Pa to about 37 Pa.

17. The method of claim 15 , wherein step (III) flows the fog through honeycomb network of channels at a flow rate of from about 0.075 m/sec to about 0.1 m/sec.

18. The method of claim 15 , wherein after step (I) and prior to step (II), further comprising wetting at least one of the first end portion and the second end portion to provide at least one wetted end portion, wherein the wetted end portion has a higher degree of wetness than an intermediate portion disposed between the first end portion and the second end portion.

19. The method of claim 15 , wherein step (I) further includes providing the honeycomb filter with an outer peripheral surface circumscribing the honeycomb network of channels and extending between the first end portion and the second end portion, and the method further comprises wetting the outer peripheral surface of the honeycomb filter to enhance the flow of fog through outer peripheral channels of the honeycomb network of channels.

20. The method of claim 15 , further comprising the step of blocking a flow of fog through inner peripheral channels of the honeycomb network of channels to enhance the flow of fog through outer peripheral channels of the honeycomb network of channels.

21. The method of claim 15 , wherein the fog includes a relative humidity of at least 80%.

22. The method of claim 15 , wherein step (II) flows the fog with a temperature within a range of from about 10° C. to about 25° C.

23. The method of claim 22 , wherein step (II) flows the fog with a temperature within an range of from about 23° C. to about 25° C.

24. The method of claim 15 , wherein step (III) flows the fog with the moisture droplets having a mean droplet size of from about 1 micron to about 25 microns.

25. The method of claim 24 , wherein step (III) flows the fog with the moisture droplets having a mean droplet size of from about 5 microns to about 25 microns.

26. A method of testing a honeycomb filter comprising the steps of:
(I) providing a honeycomb filter including a first end portion and a second end portion along an axis of the honeycomb filter, the honeycomb filter including honeycomb network of channels defined by a plurality of intersecting porous walls, wherein the honeycomb network of channels extend along the axis of the honeycomb filter between the first end portion and the second end portion;
(II) maintaining an average temperature of the honeycomb filter within a range of from about 10° C. to about 30° C.;
(III) flowing a fog with moisture droplets into the honeycomb network of channels at the first end portion of the honeycomb filter, the moisture droplets having a mean droplet size of from about 5 microns to about 25 microns, and the fog including a temperature within a range of from about 10° C. to about 30° C.; and
(IV) monitoring the second end portion of the honeycomb filter for moisture droplets of the fog exiting the honeycomb network of channels.

27. The method of claim 26 , wherein step (III) flows the fog at a pressure differential between the fir

Assignees

• Blanchard Aisha Price
• Frey Julie Charmaine
• Gargano Patrick Michael
• Joshi Ameya
• Khodosevich Konstantin Vladimirovich
• Ryszytiwskyj William Paul
• Singh John Paul Bir
• Corning Inc

Inventors

• Blanchard Aisha Price
• Frey Julie Charmaine
• Gargano Patrick Michael
• Joshi Ameya
• Khodosevich Konstantin Vladimirovich
• Ryszytiwskyj William Paul
• Singh John Paul Bir

Classifications

• G01M3/20 Primary

  using special tracer materials, e.g. dye, fluorescent material, radioactive material · CPC title

• G01N2015/084

  Testing filters · CPC title

• G01N15/082

  Investigating permeability by forcing a fluid through a sample · CPC title

• B01D46/2418

  Honeycomb filters (used for filtering exhaust gases of an internal combustion engine F01N3/022; ceramic honeycomb structures per se C04B38/0006) · CPC title