wet dust collector water scrubber Self-Induced Dust collector

The EHWD wet dust collector uses water as the scrubbing liquid. It does not require a water pump or spray nozzles for the primary scrubbing process, helping reduce nozzle-clogging issues. The self-induced wet dust collector uses a specially designed airflow path.

As dust-laden air passes through the S-shaped channel, the airflow accelerates and generates continuous turbulent water waves that intensify contact between the dust and the scrubbing water, causing particles to become wetted and captured in the water.

Self-induced wet dust collectors are suitable for demanding applications involving hot, humid, oily, sticky, high-concentration, or certain combustible dusts, subject to the specific dust properties and project safety requirements.

EHWD Wet Dust Collector Self-Induced Wet Scrubbing by High-Velocity Airflow

EHWD-C Chain Scraper Wet Dust Collector
EHWD-C Automatic Sludge Discharge
Wet Scrubbing + Activated Carbon Filtration
Wet Dust Collection + Carbon Filtration
EHWD-D Wet Dust Collector
EHWD-D Valve-Controlled Sludge Discharge
EHWD-S Integrated Wet Dust Collector
EHWD-S All-in-One Configuration
EHWD-B Wet Dust Collector
EHWD-V Wet Dust Collection Workbench

10 Common Questions About Wet Dust Collectors No Water Pump · No Spray Nozzles · Reduced Clogging Risk

Wet Dust Collection for Sintering & Steelmaking
Hot and Moisture-Laden Metallurgical Dust
Wet Dust Collection for Ore Crushing
Wet Dust Collection for Crushing
Al / Mg / Ti Combustible Metal Dust
Wet Dust Collector + F9 + HEPA

1. Can it handle hot, moisture-laden dust?

A: Yes. It can be applied to hot, moisture-laden dust streams generated by processes such as sintering, mixing, slag handling, and other metallurgical operations. Final collection performance depends on the actual process conditions and overall system design.

2. Can it be used for combustible aluminum, magnesium, and titanium dust?

A: Yes, for suitable applications. Fine dust generated during grinding or polishing of aluminum, magnesium, and titanium alloys can be combustible. The self-induced wet dust collector does not require a water pump or spray nozzles for primary dust capture. Where metal dust may react with water and generate hydrogen, a dedicated hydrogen vent path and appropriate project-specific safety measures should be considered.

3. Can it handle oily, greasy, or sticky dust?

A: Yes. Dust from quenching, casting, smelting, spraying, and similar processes may contain oil, moisture, or adhesive material. Such contaminants can quickly blind conventional filter bags or cartridges, while wet dust collection can provide a practical alternative for suitable applications.

4. Is water consumption high?

A: Water consumption is relatively low because the scrubbing water is recirculated. Water lost through evaporation or sludge discharge can be automatically replenished by a level-controlled make-up water system.

5. Can it operate in freezing conditions?

A: Yes, provided suitable freeze-protection measures are used. Options may include indoor installation above 0°C, steam heating, electric heaters, external heat tracing, or thermal insulation around the water tank and piping.

6. How is wastewater or sludge handled?

A: If an on-site wastewater treatment system is available, the slurry can be discharged for treatment. Otherwise, solid-liquid separation equipment such as a filter press or another suitable separation system can be used to recover solids and return clarified water to the wet dust collector.

7. How are floating, water-insoluble solids handled?

A: An optional floating-solids collection system can be added where lightweight material accumulates on the water surface. Overflow or other suitable separation methods can be selected according to the collected material.

8. What airflow range and pressure loss are available?

A: Large EHWD systems can be configured for airflow ranging approximately from 10,000 to 500,000 m³/h. Typical equipment pressure loss is about 1,500–2,000 Pa. Final fan pressure must also account for ductwork, hoods, and other system resistance.

9. How does the self-induced design differ from spray or Venturi wet collectors?

A: The self-induced wet dust collector does not require a water pump, spray nozzles, or packing media for primary dust capture. Fan airflow passes through a specially designed internal channel and generates continuous turbulent water waves, creating intensive contact between dust-laden air and the scrubbing water.

10. Must the unit be shut down for sludge discharge?

A: No. Suitable EHWD configurations can discharge sludge while the dust collector remains in operation. Shutdown is generally required only for maintenance tasks such as complete tank draining, inspection, or internal cleaning.

Wet Dust Collector Selection Guide Selection Reference for EHWD Self-Induced Wet Dust Collectors

EHWD self-induced wet dust collector selection guide

Working Principle Self-Induced Wet Scrubbing by Airflow-Generated Water Waves

Working principle of EHWD self-induced wet dust collector

The EHWD wet dust collector uses airflow generated by the fan to create intensive contact between dust-laden air and the scrubbing water. As the air passes through the specially designed internal flow channel, the local air velocity increases and continuously agitates the water surface, forming turbulent water waves and a dense air-water contact zone.

Dust particles entering this turbulent zone become wetted and are captured by the scrubbing water. Rapid changes in airflow direction and velocity increase the interaction between the particles and the liquid, helping transfer collected dust from the air stream into the water.

After wet scrubbing, entrained water droplets are separated from the cleaned air by internal mist-elimination baffles. The collected water returns to the tank and is reused. Because the primary scrubbing action is generated by airflow, the system does not require a recirculation water pump or spray nozzles for the main dust collection process.

A controlled quantity of make-up water is added to compensate for evaporation and water removed with discharged sludge. Stable airflow and the correct operating water level are important for maintaining consistent turbulent wave formation and dust collection performance.

Sludge Removal Methods Multiple Discharge Configurations for Different Dust Loads

EHWD-C Chain Scraper Sludge Removal

The EHWD-C wet dust collector is designed for automatic and continuous sludge removal. A chain scraper installed at the bottom of the water tank slowly conveys settled solids toward the discharge outlet, reducing the need for manual sludge removal.

This configuration is suitable for medium- and high-dust-loading applications that require long operating periods, including casting sand handling, shot blasting, polishing, grinding, bulk material conveying and similar industrial processes.

The steep side walls of the water tank help reduce material accumulation. The scraper is driven by a low-speed geared motor, while the slow conveying speed allows part of the retained water to drain from the sludge before discharge. This helps keep more process water inside the system and reduces make-up water demand.

EHWD-D Valve-Controlled Sludge Discharge

The EHWD-D wet dust collector discharges slurry through valves installed at the bottom of the hopper-shaped water tank. The collected sludge can then be transferred through piping to an external wastewater treatment or solid-liquid separation system.

Depending on the application, sludge discharge can be continuous or intermittent. This configuration is suitable for processes such as chemical material handling, mineral processing, crushing, screening, mining and quarry transfer points.

Stable liquid level is important for consistent wet scrubbing performance. Make-up water and sludge discharge should therefore be controlled according to the actual dust loading, slurry concentration and operating conditions.

Typical Applications Representative Applications for EHWD Wet Dust Collection

Steam / Hot Moisture Applications may include washing systems, die-casting machines, cutting equipment, spray processes, welding, refrigeration processes, EDM machines, galvanizing and casting operations.
Fume / Smoke Typical applications include welding, laser processing, melting furnaces, cutting, quenching, die casting, foundries, baking processes and other suitable high-temperature exhaust streams.
Al / Mg / Ti Dust Typical processes include machining, deburring, grinding, polishing, brushing and cutting operations that generate fine combustible metal dust.
Al / Mg / Ti Processing Suitable processes may include drilling, milling, sawing, deburring, forming and recycling, subject to the specific metal properties and project safety requirements.
Rubber / Leather / Plastic Applications may include shoe production, tire processing, plastic manufacturing, extrusion, model making and similar industrial processes.
Fiber / Textile Dust Applications may include textile processing, paper production, waste separation, food processing, insulation material production and other fibrous dust processes.
Sticky Dust Suitable for selected food, feed, paint, plastic, adhesive, textile finishing, mixing and conveying applications where sticky dust may quickly blind dry filter media.
Process Exhaust Applications may include food processing, cleaning systems, mixing operations, industrial exhaust treatment and other suitable process air streams.
Combustible Dust Wet collection can be considered for suitable combustible dust applications such as polishing, grinding, material processing and recovery, subject to dust properties and project-specific safety requirements.
Carbon / Ash Dust Typical applications may include carbon black, cement, mineral processing, electrode production, mold production and other high-dust-loading processes.