Bag Filter
Environmental Equipment
Bag Filter Dust Collector
Professional Process Equipment Supplier
1. Product Overview
The bag filter dust collector is a highly efficient dust removal device that uses fabric filter bags to capture particulate matter from dust-laden exhaust gas. It is widely used for industrial dust emission control in the cement, steel, power generation, mining, chemical, wood processing, and grain industries. Gas-solid separation is achieved as the dust-laden gas passes through the filter bag surface: dust particles are retained on the outside of the bags while the cleaned gas flows out from inside. Bag filter dust collectors can achieve dust removal efficiency exceeding 99.9%, with emission concentrations controlled below 10mg/Nm³, making them one of the most widely used and technologically mature high-efficiency dust collectors in the industry. With increasingly stringent environmental regulations and rising emission standards, the bag filter has become the preferred solution for dust control across all industries due to its superior filtration performance and reliable operation.
2. Working Principle
The working principle of the bag filter dust collector involves two main processes: filtration and cleaning. Dust-laden gas enters the filter housing through the inlet; as the cross-sectional area suddenly expands, the flow velocity decreases, and large particles drop directly into the hopper by gravity. Fine dust continues upward with the gas flow and is captured on the outer surface of the filter bags, while cleaned gas passes through the bag interior into the clean gas plenum and exits through the outlet. As operating time increases, the dust layer on the bag surface thickens, causing the system pressure drop to gradually rise. When the pressure drop reaches the set point, the cleaning system activates. During pulse-jet cleaning, compressed air is instantaneously injected into the bag interior through pulse valves, causing the bag to rapidly expand and vibrate. The dust layer dislodges under the combined effect of impact and vibration forces, falling into the hopper for removal by the ash discharge system. The entire cleaning process is automatically controlled by a PLC system according to preset timing sequences, cleaning chambers in rotation to ensure continuous, stable operation.
3. System Classification
3.1 Classification by Cleaning Method
| Type | Cleaning Method | Applicable Conditions | Features |
|---|---|---|---|
| Pulse-Jet Bag Filter | Compressed air pulse injection cleaning | Medium-high concentration, continuous | Strong cleaning, high efficiency, most widely used |
| Reverse-Air Bag Filter | Reverse airflow blows off dust | Large volume, low temperature | Simple structure, long bag life |
| Shaker Bag Filter | Mechanical shaking mechanism | Small volume, intermittent | No compressed air needed, simple maintenance |
| Sonic Cleaning Bag Filter | Acoustic generator vibration cleaning | Sticky dust, special conditions | No mechanical wear, minimal bag damage |
3.2 Classification by Structure
| Type | Structural Feature | Air Volume Range | Typical Application |
|---|---|---|---|
| Single-Chamber Bag Filter | Single filtration chamber | 3,000~30,000m³/h | Small production lines, local exhaust |
| Multi-Chamber Bag Filter | Multiple chambers in parallel, offline cleaning | 30,000~300,000m³/h | Large industrial kilns, cement plants |
| Modular Expandable Type | Standard module combination, expandable | 30,000~500,000m³/h | Large power plants, steel metallurgy |
4. Detailed Technical Parameters
4.1 Main Component Materials
| Component | Material | Surface Treatment | Characteristics |
|---|---|---|---|
| Filter Bag | PPS/PTFE/Fiberglass/Acrylic | Heat setting treatment | High-temp resistant, corrosion-proof, efficient |
| Cage | Galvanized steel/SS304 | Smooth surface treatment | Bag support, corrosion resistant |
| Housing | Carbon steel Q235/SS304 | Powder coated/anti-corrosion | High structural strength, good sealing |
| Hopper | Carbon steel Q235 | Anti-corrosion + insulation | Dust collection, anti-condensation |
| Blow Pipe | Seamless steel/SS | Galvanized | Uniform pulse air distribution |
| Tube Sheet | Carbon steel Q235 | Precision machined + anti-corrosion | Accurate bag positioning, good seal |
4.2 Specification Parameters
| Parameter | Small Type | Medium Type | Large Type |
|---|---|---|---|
| Filtration Area | 50~500m² | 500~5,000m² | 5,000~20,000m² |
| Air Volume | 3,000~30,000m³/h | 30,000~150,000m³/h | 150,000~500,000m³/h |
| Filtration Velocity | 0.8~1.0m/min | 0.8~1.2m/min | 0.6~1.0m/min |
| Number of Bags | 36~240 | 240~2,400 | 2,400~10,000 |
| Bag Size (Ø×L) | Ø130×2000~6000mm | Ø130×3000~8000mm | Ø130×6000~10000mm |
| Equipment Resistance | 800~1500Pa | 1000~1600Pa | 1200~1800Pa |
| Compressed Air Pressure | 0.4~0.6MPa | 0.4~0.6MPa | 0.4~0.6MPa |
| Air Consumption | 0.5~2.0m³/min | 2.0~8.0m³/min | 8.0~25.0m³/min |
| Total Power | 3.0~15kW | 15~75kW | 75~250kW |
4.3 Performance Indicators
| Indicator | Parameter Value | Test Conditions |
|---|---|---|
| Dust Collection Efficiency | ≥99.9% | Standard dust, rated conditions |
| Emission Concentration | ≤10mg/Nm³ | Compliance emission measurement |
| Air Leakage Rate | ≤2% | Room temperature static pressure test |
| Operating Pressure Drop | 800~1800Pa | Rated air volume, continuous operation |
| Filter Bag Service Life | ≥3 years (normal conditions) | Continuous operation, regular cleaning |
| Noise Level | ≤85dB(A) | Measured at 1m from equipment |
| Equipment Availability | ≥98% | Annual statistics |
4.4 Electrical Parameters
| Item | Parameter |
|---|---|
| Power Supply | 3P+N+PE, AC380V±10%, 50Hz |
| Control Power | DC24V (switching power supply) |
| Control System | Siemens S7-1200/Mitsubishi FX5U PLC |
| HMI | 7/10-inch color touchscreen |
| Pulse Valve Control | Solid-state relay/timer/differential pressure control |
| Differential Pressure Detection | DP transmitter 0~3000Pa |
| Temperature Detection | K-type thermocouple/Pt100 |
| Safety Protection | E-stop, over-temp alarm, over-pressure protection |
| Communication | Ethernet, RS485, Modbus optional |
Note: Electrical component brands can be substituted with equivalent alternatives upon request.
5. Core Component Selection
| Component | Recommended Brand | Model | Function |
|---|---|---|---|
| Pulse Valve | Goyen/Asco | CA76MM/SC G552 | Pulse-jet cleaning actuator |
| Filter Bag | BWF | PPS/PTFE membrane | Filtration and dust capture |
| Cage | OEM/Custom | Galvanized/SS304 | Support filter bag shape |
| Induced Draft Fan | Siping/Jindun | Y5-47/Y4-73 series | System draft power |
| Rotary Valve | Rigid impeller feeder | 200×200~500×500 | Continuous ash discharge |
| Screw Conveyor | OEM/Custom | LS/GX series | Centralized dust transport |
| PLC Controller | Siemens S7-1200 | 6ES7 214-1AG40 | Logic control & cleaning management |
| DP Transmitter | E+H/Rosemount | 0~3000Pa range | Monitor bag resistance |
Note: Core component brands can be configured per customer specification with prior confirmation.
6. Typical Application Fields
Cement Industry: Kiln head and tail exhaust dust collection, cement mill and packer dust control. Emission concentration stably controlled below 10mg/Nm³, meeting GB 4915-2013 special emission limits.
Steel & Metallurgy: Blast furnace gas cleaning, converter secondary fume treatment, EAF dust collection, sinter machine head/tail dedusting. Suitable for high-temperature, high-concentration conditions with PPS or PTFE bags.
Power Generation: Coal-fired boiler flue gas dedusting, ESP retrofit for ultra-low emission (≤5mg/Nm³). Can operate synergistically with FGD and SCR systems.
Mining: Crusher, screener, and belt transfer point dust control. Handles high-concentration, coarse dust with excellent wear resistance.
Chemical Industry: Reactor exhaust dedusting, dryer tail gas treatment. Corrosion-resistant filter media for acidic or alkaline dust-laden gas.
Wood Processing: Sander, cutter, planer dust collection. Combustible wood dust requires explosion-proof configuration.
Grain Industry: Grain conveying, elevating, and cleaning process dedusting. Food-grade materials prevent cross-contamination.
7 Design Standards & Certification
7. Design Standards and Certifications
| Standard Category | Standard No. | Standard Name |
|---|---|---|
| China | GB 16297-1996 | Comprehensive Emission Standard for Air Pollutants |
| China | GB 4915-2013 | Emission Standard for Air Pollutants in Cement Industry |
| China | GB 13271-2014 | Emission Standard for Air Pollutants from Boilers |
| International | ISO 9001:2015 | Quality Management System Requirements |
| Industry | HJ 2020-2012 | General Technical Specification for Bag Filter Projects |
| Industry | GB/T 16845-2017 | Dust Collectors — Terminology |
| Industry | CE | EU Machinery Directive 2006/42/EC |
8. Customization Options
| Option | Description | Application Scenario |
|---|---|---|
| Offline Cleaning System | Chamber-by-chamber cleaning with gas isolation | High concentration, fine dust conditions |
| PTFE Membrane Bags | Surface filtration, low resistance, easy cleaning | Ultra-low emission requirements (≤5mg/Nm³) |
| Explosion-Proof Configuration | Anti-static bags + relief vents + Ex-proof motors | Combustible dust environments |
| Hopper Heating & Insulation | Electric tracing + insulation to prevent condensation | High humidity / sulfur-containing gas |
| Online Monitoring System | Real-time dust/temp/pressure monitoring | Environmental compliance monitoring |
| VFD Induced Draft Fan | Variable frequency air volume control, energy saving | Variable air volume conditions |
| Remote Monitoring & Diagnostics | IoT remote O&M platform | Multi-plant/remote management |
| Stainless Steel Housing | All SS304/316L construction | Highly corrosive gas environments |
9. Warranty Terms
| Warranty Item | Warranty Content |
|---|---|
| Machine Warranty Period | 12 months from acceptance date |
| Core Component Warranty | PLC/pulse valves/fan: 24 months |
| Filter Bag Warranty | ≥3 years under normal conditions (PPS/PTFE) |
| Software Upgrade | Free upgrade during warranty period |
| Technical Training | Free training for 2~3 operators during installation |
| After-Sales Response | Phone response within 2 hours, on-site within 24~48 hours |
| Spare Parts Supply | Guaranteed for 5 years after production discontinuation |
Note: Free repair and replacement during warranty for quality-related failures; filter bag warranty requires proper operation and cleaning; damage caused by human factors or force majeure is excluded.
10. Packaging & Delivery
| Item | Description |
|---|---|
| Packaging Method | Machine wrapped in moisture-proof film + wooden crate |
| Crate Specification | Export-grade plywood crate (fumigation-free) |
| Moisture Protection | Desiccant + vacuum aluminum foil bag |
| Shock Protection | EPE foam + bubble wrap cushioning |
| Lifting Method | 4-point top lifting |
| Transport Method | Truck/railway/ocean shipping |
Lead time: 45~60 working days after contract signing and deposit received. Installation & commissioning: Seller dispatches technicians for on-site installation, approximately 7~15 working days.
11. Inquiry Information Required
To receive an accurate quotation, please provide the following information:
Air volume (m³/h) and operating temperature
Inlet dust concentration (g/Nm³) and dust characteristics
Required emission concentration (mg/Nm³)
Gas composition (acidic/alkaline/combustible gas content)
Filter bag material requirement (PPS/PTFE/Fiberglass/Acrylic)
Cleaning method preference (pulse-jet/reverse-air)
Installation space limitations and interface dimensions
Power supply and compressed air specifications
Explosion-proof configuration requirement
Other special customization requirements