EFMC Series Explosion-Protected Dust Collector

The EFMC Series Explosion-Protected Dust Collector is designed for dust collection applications involving combustible or potentially explosive dust. It integrates filtration, pulse-jet cleaning, dust discharge and multiple explosion-protection measures to provide safer and more reliable dust control for industrial production environments.

Many industrial dusts can become combustible or explosive when suspended in air at certain concentrations. Typical examples include flour dust, coal dust, wood dust, textile fibers and certain metal powders such as aluminum dust. For these applications, both the production area and the dust collection system require appropriate fire and explosion protection measures.

Compared with a conventional dust collector, the EFMC Series can incorporate additional safety components such as explosion vent panels, fire suppression systems, temperature sensors, pressure sensors, differential pressure monitoring, anti-static filter media, explosion-protected fans, explosion isolation valves and grounding systems.

Depending on the process and dust characteristics, explosion-protected dust collection systems can be configured as baghouse dust collectors, cartridge dust collectors or wet dust collection systems.

Product Overview

The EFMC Series is designed for industrial dust collection systems where combustible dust may be present. The equipment combines high-efficiency filtration with anti-static filter media and optional explosion-protection devices to reduce the risks associated with dust accumulation, static electricity, pressure rise and ignition sources.

The main body generally consists of a clean-air chamber, filtration chamber, dust hopper and supporting structure. Dust-laden air enters the collector, where larger particles settle toward the hopper while finer dust particles are retained on the outer surface of the filter bags or other selected filter media.

Filtered air passes into the clean-air chamber and is discharged through the outlet duct by an explosion-protected fan. Depending on the application, the system can be integrated with explosion venting, isolation, fire suppression and monitoring devices.

Working Principle

Dust-laden gas enters the dust collector through the inlet duct and first reaches the lower section or hopper. Larger dust particles settle directly into the hopper due to gravity and inertia, while finer particles move upward with the airflow into the filtration chamber.

The fine dust is captured on the outer surface of the anti-static filter bags. Clean air passes through the filter media into the upper clean-air chamber and is then discharged through the clean-air manifold and exhaust duct by an explosion-protected fan and motor.

During operation, dust gradually accumulates on the filter surface. A PLC-based control system periodically activates the pulse valves. Compressed air is released in short pulses to clean the filter bags and dislodge accumulated dust.

The removed dust falls into the hopper and is discharged through an appropriate explosion-protected discharge device. Depending on the material characteristics and process requirements, the discharge system may operate continuously or intermittently.

Main Treatment Process

1. Dust-Laden Air Intake: Contaminated air enters the dust collector through the inlet duct.
2. Pre-Separation: Larger particles settle toward the hopper under gravity and inertia.
3. Fine Dust Filtration: Fine particles are captured by anti-static filter bags or other selected filter media.
4. Clean Air Collection: Filtered air enters the upper clean-air chamber.
5. Clean Air Discharge: Purified air is discharged through the exhaust duct by an explosion-protected fan.
6. Pulse-Jet Cleaning: Compressed air periodically removes accumulated dust from the filter surface.
7. Dust Settlement: Released dust falls into the hopper.
8. Dust Discharge: Collected material is removed through an explosion-protected discharge system.

Product Features

• Designed for Combustible Dust Applications: Suitable for processes involving potentially combustible or explosive dust when properly configured for the specific hazard.
• Anti-Static Filter Media: Conductive or anti-static filter bags help reduce electrostatic charge accumulation during filtration.
• Explosion-Protected Fan Option: Explosion-protected fan and motor configurations can be selected according to project requirements.
• Explosion Venting: Explosion vent panels can be incorporated to provide controlled pressure relief under specified conditions.
• Explosion Isolation: Explosion isolation valves can be used on ductwork to help reduce flame and pressure propagation between connected equipment.
• Temperature Monitoring: Temperature sensors can be installed at key locations such as the inlet and hopper.
• Pressure Monitoring: Pressure and differential pressure sensors can be integrated for real-time equipment monitoring.
• Fire Suppression Options: Water spray, CO₂ or other suitable suppression systems may be configured according to process requirements.
• High-Body Inlet Option: High-position inlet configurations can be used for suitable fine-dust applications.
• High Dust-Loading Capability: Under suitable design conditions, the system can process inlet dust concentrations of up to 1,000 mg/m³, with outlet dust concentrations below 10 mg/m³.
• Compact Square Structure: The rectangular housing design helps reduce the overall equipment footprint.
• Multiple Filter Configurations: Cylindrical and pleated filter media options are available for different operating conditions.
• Welded Housing: Welded construction provides improved airtightness, structural strength and durability.
• Integrated Fan Option: An integrated fan configuration can help reduce installation space requirements.
• Tool-Free Filter Installation: Snap-band filter bag openings allow convenient installation of filter bags and cages.

Main Explosion Protection Configuration

Explosion Protection Measures

1. Explosion-Resistant Structural Design

The internal structure of the dust collector is designed to minimize areas where combustible dust can accumulate. Beams, partitions and other internal components can be equipped with inclined dust-shedding surfaces to reduce material deposits.

The hopper geometry is designed to promote smooth material discharge. Additional slide plates may be installed where necessary to eliminate dead zones and reduce dust accumulation between adjacent hopper walls.

For applications involving high temperatures or moisture, insulation, steam tracing or electrical heating may be considered to reduce condensation and material bridging. Hopper vibrators or air cannons may also be used where necessary to assist material flow.

2. Anti-Static Filter Bags

High concentrations of moving dust can generate static electricity through particle-to-particle and particle-to-filter friction. If electrostatic charge is allowed to accumulate, discharge sparks may become a potential ignition source.

For this reason, the EFMC Series can use anti-static needle-felt filter bags containing conductive fibers such as metal fibers or carbon fibers. The filter bags are electrically connected through the cages, tube sheet and equipment housing to the grounding system.

3. Explosion Venting and Isolation

Explosion venting and isolation devices are important components of combustible dust protection systems. Explosion vent panels are pressure-activated relief devices designed to open rapidly when a predetermined pressure is reached.

Compared with conventional pressure relief valves, explosion vent panels provide a large relief area and rapid response. They may be manufactured from aluminum, nickel, stainless steel, graphite or other suitable materials depending on the application.

Common designs include domed, reverse-buckling and flat explosion vent panels. The appropriate configuration and activation pressure must be selected according to the dust collector design pressure, dust explosion characteristics and applicable safety requirements.

Explosion isolation valves may also be installed in connected ductwork to help prevent an explosion from propagating from the dust collector into upstream or downstream process equipment.

4. Fire Detection and Suppression

Appropriate detection and fire suppression systems can be incorporated into the dust collection system according to the characteristics of the combustible material and the industrial process.

• Fire Suppression: Water, CO₂, nitrogen or other suitable extinguishing media may be selected according to the process and material characteristics.
• Temperature Detection: Temperature sensors can be installed at the inlet, hopper and other critical locations to monitor abnormal temperature rise.
• CO Monitoring: For large dust collection systems, CO detection can provide additional early warning of internal smoldering or combustion.
• Control Interlock: Alarm signals can be linked with the dust collection control system to initiate shutdown or other protective actions when abnormal conditions are detected.

5. Equipment Grounding

Reliable equipment grounding is an important part of explosion protection. The dust collector housing, ductwork and conductive components should maintain electrical continuity to reduce static electricity accumulation.

Conductive bonding connections can be installed across equipment flanges and other joints. Connections should be mechanically secure and designed to maintain conductivity and corrosion resistance throughout long-term operation.

6. Explosion-Protected Electrical Components

Electrical components installed in hazardous dust environments should be selected according to the required explosion-protection classification. Potential ignition sources from electrical switching, arcing or sparking must be considered during equipment selection.

Depending on the project requirements, components such as motors, solenoid valves, pulse valves, lifting valves, control devices and electrical accessories can be supplied in appropriate explosion-protected versions.

Filter and Cleaning System

The pulse-jet cleaning system is controlled automatically by a PLC or programmable pulse controller. During cleaning, compressed air is released through the pulse valves into the filter bags, generating a rapid reverse airflow that removes accumulated dust from the filter surface.

The use of anti-static filter media together with reliable grounding provides a conductive path for electrostatic charge dissipation while maintaining efficient particulate filtration.

Multiple Dust Discharge Configurations

The EFMC Series can be configured with different dust discharge systems according to the amount of collected material, plant layout and customer requirements.

Typical Applications

The EFMC Series Explosion-Protected Dust Collector is widely used for dust control and material recovery in industries where combustible dust may be generated.

• Food processing
• Flour and powder handling
• Woodworking and furniture manufacturing
• Textile manufacturing
• Power industry
• Chemical industry
• Carbon black production
• Metallurgical industry
• Metal powder processing
• Aluminum processing
• Coal and carbon material handling
• Powder mixing and conveying
• Combustible dust collection
• Industrial material recovery

Typical Combustible Dust Types

Equipment Selection

The configuration of an explosion-protected dust collection system should be determined according to the actual operating conditions, dust characteristics and project requirements.

• Airflow volume
• Dust concentration
• Particle size distribution
• Dust combustibility characteristics
• Dust moisture and adhesion characteristics
• Operating temperature
• Required filtration efficiency
• Filter media type
• Dust discharge method
• Installation environment
• Explosion venting and isolation requirements
• Fire detection and suppression requirements
• Electrical explosion-protection requirements

Note: Equipment dimensions, filtration area, fan capacity, filter media, explosion-protection devices and discharge configuration can be customized according to actual site conditions and process requirements.

Safety Notice: The final design of explosion venting, isolation, suppression, electrical protection and grounding systems should be determined by qualified professionals according to the actual dust hazard assessment, process conditions and applicable local safety standards.

Why Choose the EFMC Series?

Model / Specification	EFMC-20	EFMC-40	EFMC-70	EFMC-85	EFMC-100	EFMC-130	EFMC-150	EFMC-180
Airflow (m³/h)	1500–2100	2800–3800	4700–6300	5800–8000	7000–9600	7000–9600	10000–13800	12300–16700
Explosion-Proof Fan Power (kW)	4	5.5	11	11	15	15	15	22
Filter Bag Size (mm)	Φ140 × 1500	Φ140 × 2000	Φ140 × 2500	Φ140 × 2500	Φ140 × 3000	Φ140 × 3000	Φ140 × 3500	Φ140 × 3500
Number of Filter Bags	36	49	64	64	81	100	100	121
Filtration Area (m²)	23.7	43.1	70.4	89.1	106.9	132	154	186.3
Pulse Valve Size	1.5" (Explosion-Proof Type)
Number of Pulse Valves	6	7	8	9	9	10	10	11
Filter Bag Material	Anti-Static Polyester Fiber
Cleaning Method	Pulse-Jet Cleaning
Length (mm)	1300	1470	1700	1900	1900	2100	2100	2300
Width (mm)	1300	1470	1700	1900	1900	2100	2100	2300
Height (mm)	3930	4630	5330	5530	6030	6130	6630	6830
Purification Efficiency	>99.5%
Explosion Protection Accessories	Explosion Vent Panel, Explosion-Proof Temperature Sensor, Explosion-Proof Pressure Sensor, Fire Sprinkler System, Explosion-Proof Rotary Airlock Valve, Explosion-Proof Fan Speed Sensor, Explosion Isolation Valve, etc.

The EFMC Series combines efficient industrial dust filtration with configurable explosion-protection measures for applications involving combustible dust. Anti-static filtration, pulse-jet cleaning, explosion venting, isolation, monitoring, grounding and explosion-protected components can be integrated into one complete dust collection system.

With multiple filter configurations and dust discharge options available, the EFMC Series can be adapted to different production processes, installation layouts and material-handling requirements.