Filter construction for use with air in-take for gas turbine and methods

• US 8,721,756 B2
• Filed: 09/14/2012
• Issued: 05/13/2014
• Est. Priority Date: 06/13/2008
• Status: Active Grant

• Current Assignee: Donaldson Company Incorporated
• Original Assignee: Donaldson Company Incorporated
• Inventors: Handley, Michael W., Brandenhoff, Mark, Patel, Kirit, Sporre, Timothy D.
• Primary Examiner(s): Greene, Jason M
• Application Number:
  US13/616,627
• Publication Number:
  US 20130008313A1
• Time in Patent Office: 606 Days
• Field of Search: 553/02, 553/851, 554/86, 554/87, 554/98, 555/21, 555/24, 555/27, 555/28, 96/4, 96/11, 96/12, 95/45, 952/80, 952/85, 952/86, 952/87
• US Class Current: 55/486
• CPC Class Codes: B01D 2275/10 Multiple layers
• CPC Class Codes: B01D 46/121 V-type arrangements
• CPC Class Codes: B01D 46/2403 characterised by the physical shape or structure of the filtering element
• CPC Class Codes: B01D 46/521 using folded, pleated material
• CPC Class Codes: B01D 46/543 using membranes
• CPC Class Codes: B01D 46/71 with pressurised gas, e.g. pulsed air

Abstract

The filter of the invention is a cartridge filter comprising a structure that can maintain a filter medium in an air stream to filter particulates to protect a gas turbine power system. The filter combines a mechanically adequate filter structure and an effective filter medium for to obtain a useful system.

Claims

1. A filter medium comprising:

a depth loading structure comprising a porous wet laid substrate having anchoring surfaces, wherein the wet laid substrate comprises bicomponent fibers and at least one other type of fiber selected from filtration fibers, binder fibers, reinforcing fibers, and reactive fibers;

a PTFE membrane disposed on an anchoring surface of the porous wet laid substrate; and

a nanofiber media layer disposed on an anchoring surface of the porous wet laid substrate.

2. The filter medium of claim 1 wherein the filter medium further comprises an oleophobic coating.

3. The filter medium of claim 1 wherein the nanofiber is electroblown.

4. The filter medium of claim 1 designed to filter particulates from an air stream.

8. The air filtration medium of claim 1 wherein the nanofiber has a fiber size of 100 nm to 800 nm.

9. The air filtration medium of claim 8 wherein the nanofiber has a fiber size of 200 nm to 600 nm.

5. Air filtration medium comprising:

a depth loading structure comprising a porous wet laid substrate having anchoring surfaces, wherein the porous wet laid substrate comprises bicomponent fibers and glass fibers;

a PTFE membrane disposed on an anchoring surface of the porous wet laid substrate; and

a nanofiber media layer disposed on an anchoring surface of the porous wet laid substrate.

6. The air filtration medium of claim 5 wherein the nanofiber is electroblown.

7. The air filtration medium of claim 5 wherein the filter medium further comprises an oleophobic coating.

10. The air filtration medium of claim 5 wherein the nanofiber has a fiber size of 100 nm to 800 nm.

11. The air filtration medium of claim 10 wherein the nanofiber has a fiber size of 200 nm to 600 nm.

12. Air filtration medium comprising:

a depth loading structure comprising a porous wet laid substrate having anchoring surfaces, wherein the porous wet laid substrate comprises bicomponent fibers, glass fibers, and one or more types of secondary fibers;

a PTFE membrane disposed on an anchoring surface of the porous wet laid substrate; and

a nanofiber media layer disposed on an anchoring surface of the porous wet laid substrate, wherein the nanofiber is electroblown and has a fiber size of 200 nm to 600 nm.

13. The filter medium of claim 12 wherein the filter medium further comprises an oleophobic coating.