Self-cleaning Air Filter
Introduction
A self-cleaning air filter system is an automated intake air filtration unit engineered to remove airborne particulate matter before process air enters industrial rotating machinery. Installed at atmospheric intake points, these units protect air separation unit (ASU) main air compressors, centrifugal compressors, gas turbines, and large industrial blowers.
Technical Specifications
|
Parameter |
Standard Configuration |
|
Rated Airflow |
200–1,200 m³/min (≈ 12,000–72,000 m³/h) |
|
Design Airflow Margin |
Select a model with rated flow 10%–20% above the compressor's maximum suction flow |
|
Filtration Rating |
ePM1 85% (ISO 16890) or MERV 15 (ASHRAE 52.2) |
|
Filtration Face Velocity |
Approx. 0.79 m/min (13 mm/s) at rated airflow; recommended design range 0.7–0.9 m/min |
|
Initial Pressure Drop |
150–250 Pa at rated airflow |
|
High Differential Pressure Alarm |
800 Pa (cartridge replacement recommended if pressure drop stays high after cleaning) |
|
Compressor Energy Impact |
Each 1 kPa of intake pressure drop raises centrifugal compressor power by approx. 0.3–0.5% |
|
Cartridge Quantity |
12–72 per standard housing |
|
Filter Area per Cartridge |
21 m² |
|
Housing Dimensions (L × W × H) |
2,400 × 1,800 × 2,200 mm (24-cartridge unit) |
|
Outlet Connection |
DN600–DN1800 |
|
Dry Housing Weight |
1,800–8,500 kg |
|
Ambient Operating Temperature |
−20°C to +50°C |
|
Power Supply |
380/440 V AC, 3-phase, 50/60 Hz |
Self-cleaning Mechanism
Pulse-jet cleaning: Solenoid valves deliver 80–120 ms compressed-air pulses through venturi nozzles above each cartridge row.
Cleaning modes: Differential-pressure control, timed intervals, or manual activation.
Air consumption: 0.8–2.5 Nm³/min during active cleaning, with a supply pressure of 0.5–0.7 MPa. Consumption is referenced to 0°C and 101.3 kPa.
Continuous airflow: Sequential row cleaning keeps the remaining filter rows in service during the cleaning cycle.
Dust discharge: Collected dust falls into the hoppers and is removed through manual butterfly valves, weighted flap valves, or motorized rotary airlocks.
Filtration Performance
Media options: Cellulose-polyester blends, 100% spunbond polyester, and ePTFE membranes with zinc-plated steel mesh cores.
Filtration ratings: Media options are rated under ISO 16890 or ASHRAE 52.2. E10 media under EN 1822 is available as a separate option. Test reports for selected media grades are available on request.
Media limits: Selected ePTFE media supports continuous air temperatures up to 80°C and relative humidity up to 95% under non-condensing conditions. These limits apply to the media element, not the complete system.
Pulse cleaning: Reverse air pulses remove accumulated dust to help control operating pressure drop.
Filter Cartridge Service Life
Expected service life: Typically 12–24 months at inlet dust concentrations below 10 mg/m³. High dust loading may reduce service life to 6–12 months. Actual life depends on site conditions and operating history.
Cleaning restrictions: Use dry reverse pulse-jet cleaning only. High-pressure water and solvent cleaning can damage the filter media.
Wear parts: Diaphragms, solenoid coils, pressure transmitters, fuses, and door seals are listed in the spare parts catalog.
Maintenance
• Monthly: Drain and inspect compressed-air filters and water traps.
• Quarterly: Check pulse valve operation and diaphragm condition.
• Every six months: Inspect door gaskets and housing seals.
OEM & Customization Options
System Configuration: Customize filter housing dimensions, air inlet and outlet layouts, cartridge quantity, and access arrangements.
Materials & Surface Protection: Select carbon steel or stainless steel housing materials, with coating and corrosion protection options.
Control System Integration: Configure PLC brands, differential pressure monitoring, pulse-cleaning controls, and communication interfaces to match existing plant control systems.
Project Engineering & Validation: Review airflow requirements, installation drawings, foundation loads, and interface dimensions before production. Factory acceptance testing (FAT) can be arranged according to agreed project specifications.
FAQ
Q: What is the typical lead time?
A: Standard JLF-SC models ship in 6–10 weeks, while stainless-steel or custom units require 10–14 weeks. Installation of a 24-cartridge unit typically takes 3–5 days.
Q: What certifications and reports are available?
A: ISO 9001 manufacturing records and ISO 16890 or ASHRAE 52.2 media test reports are available. Control panels can also be supplied with CE marking upon request.
Q: How quickly are replacement cartridges available?
A: Standard cartridges typically ship within 7–10 days and arrive by air freight within 2–3 weeks in most regions. One spare set per two installed units is recommended.
Q: How do temperature and altitude affect model selection?
A: Required intake capacity increases by approximately 3.5% per 10°C and 12% per 1,000 m of altitude.
Q: What does ePM1 85% mean?
A: Under ISO 16890, ePM1 85% indicates at least 85% efficiency for particles in the 0.3–1 μm range, helping protect compressor impellers and heat exchangers from fouling.
Q: Can the filter be retrofitted?
A: Yes. A transition piece and support frame can be designed to match existing DN600–DN1800 duct flanges.
Q: How does the filter handle rain, fog, and snow?
A: Weather hoods and drain louvers help prevent rain and snow ingress, while hydrophobic ePTFE media resists moisture loading.
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