The WFD is a range of modular reverse jet cleaned horizontal flat bag (or "cassette") filters designed for continuous operation in heavy duty applications.
Based closely upon the WFS, the WFD features a downflow design, dirty gas entering via an inlet hood at high level, passing downwards across the horizontal bags where the dust is separated from the gas. Most of the dust then drops into the hopper. The cleaned gas passes through the bags, upon the surface of which a filter cake is deposited, then into the clean gas chamber from where it is extracted at low level.
The WFD is a reverse jet cleaned alternative to the WFS reverse air filter, particularly useful where the higher quantity of cleaning air injected by the WFS could adversely affect the process gas conditions.
Specifications
Air volume | 1,500~120,000 m3/h for single housing |
Filter area | 18~1102 m2 for single housing |
Max. dust load | >300g/m3 |
Operation temperature | Standard version up to 130 °C Optional high temp. version up to 220 °C |
Manner of work | negative pressure |
Strength | Standard version up to -600daPa Reinforced version up to -3200daPa |
Method of cleaning | Compressed air An operating pressure of at least 6.5 bar (max. 8 bar) in the compressed air tank is required. |
Components
1. Dirty gas hood
2. Dirty gas chamber
3. Filter bag with spacer mat
4. Filter bag support
5. Cleaning gas chamber
6. Slotted wall with clamping frame
7. Blast pipe with injection nozzle
8. Compressed air vessel with diaphragm valve
9. Electrical cabinet with electronic control for cleaning system
10. Dust collection hopper with screw conveyor
11. Platform with ladder
A. Dirty gas entry
B. Clean gas exit
C. Dust discharge
Compressed air vessel with diaphragm valves – Old type
Compressed air vessel with diaphragm valves – Current type
Advantages
● Fully welded steel construction
● Compact modular design
● Small space requirement
● Wide range of filter media for special applications
● High efficiency compressed air pulse cleaning during continuous operation
● Low cleaning air volume reduces cooling effect during cleaning, a valuable consideration when acid gases are present, to minimize condensation effects
● For sticky dust
Applications
● Shot blast
● Grinding & fettling
● Crematory
● ???
FAQs: WFD Reverse Jet Horizontal Bag Dust Collector
Q1: What is the WFD dust collector designed for?
The WFD is a modular reverse-jet horizontal bag (box-type) dust filter engineered specifically for continuous operation in heavy-duty industrial applications. It serves as a reliable dust removal solution, especially for production processes where excessive clean air injection would negatively affect process conditions.
Q2: How does the WFD filter separate dust from contaminated air?
Contaminated gas enters the unit through the upper inlet, flows downward through the horizontal filter bags, and dust particles are captured on the bag surface. Most collected dust falls directly into the hopper, while purified air passes through the filter media into the clean air chamber. An automatic reverse jet pulse system cleans the filter bags without interrupting operation.
Q3: What is the core difference between the WFD and WFS dust collector series?
The WFD is developed based on the WFS platform, but adopts a reverse jet cleaning mechanism as an optimized alternative. Unlike the WFS design which injects large volumes of clean air into the system, the WFD minimizes air interference with the production process, making it ideal for scenarios sensitive to excess clean air intake.
Q4: What is the air handling capacity and filtration area of the WFD series?
For a single housing unit, the air volume ranges from 1,500 to 120,000 cubic meters per hour, and the filtration area covers 18 to 112 square meters. Its modular design allows multiple units to be combined to meet larger airflow requirements.
Q5: What industries and dust types is the WFD suitable for?
It is widely applied in foundries, shot blasting workshops, metal fabrication, powder processing, woodworking and other industrial sectors. It effectively handles dry industrial dust including metal dust, foundry sand, grinding dust and general particulate matter.
Q6: Can the WFD support 24/7 non-stop production?
Yes. It is purpose-built for heavy-duty continuous operation. The online reverse jet cleaning system regenerates filter capacity without shutting down the unit, ensuring stable suction performance around the clock for high-volume production lines.
Q7: What is the service life of the filter bags?
Bag lifespan depends on dust concentration, particle abrasiveness and operating conditions. Under standard industrial working conditions with proper maintenance, filter bags typically last 12–24 months. Regular inspection and timely system maintenance can further extend service life.
Q8: Can the WFD be configured with explosion-proof features for combustible metal dust?
Yes. Explosion-proof configurations are available for combustible dust scenarios such as aluminum-magnesium alloy dust. Upgrades include explosion venting panels, flame detectors, isolation valves and anti-static filter media, compliant with ATEX and relevant dust explosion safety standards.
Q9: Is the WFD system expandable for future production upgrades?
Absolutely. Its fully modular structure allows flexible expansion by adding extra housing units. You can scale up filtration capacity to match increased production output without replacing the entire system.
Q10: What routine maintenance is required for the WFD dust collector?
Key maintenance tasks include regular inspection of filter bag wear and sealing integrity, checking reverse jet pressure and pulse valve function, timely ash discharge from the hopper to avoid dust buildup, and periodic inspection of the fan and bearing lubrication.
