Filter cassette, filter arrangement, and gas turbine with such filter cassette

• US 20120020773A1
• Filed: 03/31/2010
• Published: 01/26/2012
• Est. Priority Date: 04/02/2009
• Status: Active Grant

• Current Assignee: Torsten Herrmann
• Original Assignee: Torsten Herrmann
• Inventors: Herrmann, Torsten
• Granted Patent: US 8,870,994 B2
• Time in Patent Office: Days
• US Class Current: 415/121.2
• CPC Class Codes: B01D 46/0005 Mounting of filtering elements within casings, housings or frames B01D46/2422 takes precedence
• CPC Class Codes: B01D 46/121 V-type arrangements
• CPC Class Codes: B01D 46/521 using folded, pleated material
• CPC Class Codes: F02C 7/052 with dust-separation devices

Abstract

A filter cassette (1) for removing particles from an air stream, in particular from a gas stream entering a gas turbine, has an upstream end (14) and a downstream end (16) and comprises a mounting frame to which a filter media (4) is fitted and which has a mounting face (5) adapted for mounting the filter cassette to an opening (15) of a partition (6). The mounting face is positioned between the filter cassette'"'"'s upstream and downstream ends at a first distance (D_up) from said upstream end (14) and a second distance (D_down) from said downstream end (16). The first and second distances each amount to more than 10% of an overall length of the filter cassette. Preferably, the mounting face (5) is positioned centrally between the upstream and down-stream ends (14, 16), approximately in a barycenter line of the filter cassette (1). The filter cassette thus extends to both sides of the partition opening (15). Filter surface area is increased and torque induced by the filter cassette (1) into the partition (6) is reduced.

Claims

1. A filter cassette (1) for removal of particles from an air stream, said filter cassette having an upstream end (14) and a downstream end (16) and comprising a mounting frame (8) to which a filter media (4) is fitted and which has a mounting face (5) adapted for mounting the filter cassette to an opening of a partition (6), wherein said mounting face (5) is positioned between the filter cassette'"'"'s upstream and downstream ends (14, 16) at a first distance (D_up)from said upstream end (14) and a second distance (D_down) from said downstream end (16), each of said first and second distances (D_up, D_down) amounting to more than 10% of an overall length (L) of the filter cassette.

2. The filter cassette (1) of claim 1, wherein said first and second distances (D_up, D_down) are at least 40 mm, more preferably 100 mm or more.

3. The filter cassette (1) of claim 1, wherein said first and second distances (D_up, D_down) each amount to more than 25%.

4. The filter cassette (1) of claim 1, wherein said mounting face (5) is positioned centrally between said upstream and downstream ends (14, 16) with respect to said overall length (L) of the filter cassette.

5. The filter cassette (1) of claim 1, wherein said mounting face (5) is positioned in a barycenter line of the filter cassette with respect to said upstream and downstream ends (14, 16).

6. The filter cassette (1) of claim 1, wherein said filter media (4) comprises a plurality of filter panels (2) extending in an upstream-to-downstream direction, wherein said filter panels (2) are interconnected alternately at their upstream and downstream ends (14, 16) and side walls (10) connecting adjacent filter panels (2) are provided so that fluid passing through the filter cassette is forced to pass through said filter panels.

7. The filter cassette (1) of claim 6, wherein said mounting frame (8) is connected to said filter panels (2) in an area of the filter cassette (1) where the filter cassette is to be mounted to said partition (6) by means of said mounting face (5).

8. The filter cassette (1) of claim 7, wherein upstream of said mounting frame (8) said side walls (10) are provided only between downstream surface sides (18) of adjacent filter panels (2).

9. The filter cassette (1) of claim 7, wherein downstream of said mounting frame (8) said side walls (10) are provided only between upstream surface sides (17) of adjacent filter panels (2).

10. The filter cassette (1) of claim 7, wherein upstream of said mounting frame (8) said side walls (10) are provided only between downstream surface sides (18) of adjacent filter panels (2) and downstream of said mounting frame (8) said side walls (10) are provided only between upstream surface sides (17) of adjacent filter panels (2).

11. The filter cassette (1) of claim 7, wherein the two outermost filter panels extend from said upstream and/or downstream ends (14, 16) to said mounting face (5) and have a filter function.

12. The filter cassette (1) of claim 1, wherein the filter media (4) has a particulate filtration efficiency of at least filter class H10, preferably filter class H12, according to EN 1822, the filter cassette providing a pressure drop of less than 200 Pa at an air flow of 3,400 m³ per hour.

13. The filter cassette (1) of claim 12, wherein the pressure drop at an air flow of 3,400 m³ per hour is less than 180 Pa, preferably less than 160 Pa, more preferably less than 140 Pa, even more preferably less than 120 Pa, most preferably less than 100 Pa.

14. A filter arrangement comprising a partition (6) having an opening (15) and a mounting face (13) surrounding said opening (15), wherein a filter cassette (1) of any of claims 1 to 13 is mounted to said partition mounting face (13) so that said filter media (4) of the filter cassette projects to both sides of said partition mounting face (13).

15. A gas turbine, comprising one or more than one filter cassette (1) of claim 1 arranged for removing particles from a gas stream entering the gas turbine.

16. The gas turbine of claim 15, having an air flow capacity of at least 1,000 m³ per hour, preferably more than 4,000 m³ per hour, more preferably more than 10,000 m³ per hour.

17. The gas turbine of claim 15, wherein at least one filter cassette (1) has an air flow capacity between 500 and 6,000 m³ per hour.

18. Use of the filter cassette (1) of claim 1 for removing particles from a gas stream entering a gas turbine.

19. Use of the filter cassette (1) according to claim 18 in an air intake of a gas turbine having an air flow capacity of at least 1,000 m³ per hour, preferably more than 4,000 m³ per hour, more preferably more than 10,000 m³ per hour.