METHOD FOR THE BACKFLUSHING OF FILTERS

• US 20090020012A1
• Filed: 05/28/2008
• Published: 01/22/2009
• Est. Priority Date: 06/01/2007
• Status: Active Grant

• Current Assignee: Wallstein Rothemuehle SP Z OO
• Original Assignee: Balcke-Durr GmbH (C Capital Srl)
• Inventors: Holten, Wolfgang, Kalka, Arnold, Hoffmann, Horst, Kordas, Friedel, Podhorsky, Miroslav
• Granted Patent: US 8,349,057 B2
• Time in Patent Office: Days
• US Class Current: 95/280
• CPC Class Codes: B01D 46/04 Cleaning filters
• CPC Class Codes: B01D 46/71 with pressurised gas, e.g. pulsed air

Abstract

Air filters comprising thin-walled textile filter bodies have to be cleaned periodically. According to a method known to this purpose, the filtered material is loosened using pressure pulses in a flushing air flow. According to the invention, for generating the pressure pulses a plurality of small, quick-acting valves are in each case briefly opened, the opening moments being adapted to one another in such a way that partial pulses released thereby arrive simultaneously at the inlet of a flushing line common thereto.

Claims

1. Method for the backflushing of filters made of thin-walled textile filter bodies using pressure pulses in a flushing air flow, wherein for generating the pressure pulses a plurality of small, quick-acting valves are in each case briefly opened, the opening moments being adapted to one another in such a way that partial pulses released thereby arrive simultaneously at the inlet of a flushing line common thereto.

2. Method according to claim 1, wherein the small, quick-acting valves used are diaphragm valves which are connected to a compressed air container via withdrawal lines.

3. Method according to either claim 1, wherein the opening time of the quick-acting valves lasts a total of approximately 100 milliseconds for each pulse.

4. Method according to claim 3, wherein three quick-acting valves interact.

5. Method according to claim 4, wherein the quick-acting valves tap the same compressed air container.

6. Method according to claim 5, wherein the partial pulses meet in a Y-branch pipe at an acute angle α

.

7. Method according to claim 6, wherein the duration of a rise in pressure of the pulse is substantially equal to the duration of the maximum pressure during a pulse.

8. Method according to claim 7, wherein the compressed air is replaced by an inert gas, for example nitrogen.

9. Method according to claim 8, wherein the filter has a large number of tubular filter bodies which are connected in parallel and are acted on individually or successively in groups by pressure pulses.

10. Method according to claim 9, wherein the filtered material is removed from the filter bodies counter to the direction of flow of the mixture to be filtered.