These industrial wet dust collectors use fan-driven airflow through specially shaped channels, lifting water into a turbulent curtain that washes dust from the air. No scrubbing pump or spray nozzles are needed.
No scrubbing pump or spray nozzles to maintain or clog
Suitable for wettable, sticky dust and humid process air
No filter bags or cartridges in the wet collection stage
For aluminum, magnesium and titanium grinding and polishing dust*
* Combustible-metal applications require dust-specific assessment of water compatibility, water-level protection, hydrogen ventilation and sludge handling.
Water-Based CaptureNo wet-stage filter bags or cartridges
Pump-Free ScrubbingFewer parts to service
No Spray NozzlesNo nozzle-clogging issue
Metalworking DustGrinding · polishing · deburring
01 / LARGE-CAPACITY CONFIGURATIONS
Three EHWD Configurations for Sludge Removal
EHWD-B, C and D share the self-induced wet scrubbing principle. Their main difference is how collected sludge is removed from the water tank.
EHWD-B
Flat-Bottom Type
Click to enlarge
Sludge settles in the flat-bottom tank and is removed manually. Typically selected for airflow up to approximately 20,000 m³/h; above this level, manual cleaning is usually impractical.
EHWD-C
Chain Scraper Type
Click to enlarge
A chain scraper removes settled sludge from the tank. One of the main configurations for large-airflow projects.
EHWD-D
Conical Hopper Type
Click to enlarge
Sludge collects in the lower conical hopper and is discharged by flushing. Another main configuration for large-airflow projects.
02 / ACTUAL EQUIPMENT
B, C and D — Factory Views
Assembled equipment in our workshop. The examples below show the external layout and visible components of each configuration.
EHWD-B
Factory Views
Click to enlarge
Two views show the assembled collector, top-mounted fan, inspection window and side-mounted control cabinet.
EHWD-C
Platform and Scraper Assembly
Click to enlarge
The assembled unit shows the upper fan platform, access ladder and inclined scraper discharge with a collection trolley.
EHWD-D
Hopper and Controls
Click to enlarge
The assembled unit shows the top-mounted fan, lower hopper, support frame and side-mounted control cabinet.
03 / HOW IT WORKS
How Self-Induced Wet Scrubbing Works
This self-induced wet scrubber draws dust-laden fumes into a specially shaped airflow passage. Accelerating air drives vigorous, continuously rolling waves and splashes without a separate water pump or spray nozzles.
EHWD-C shown. The wet scrubbing principle is shared by the B, C and D configurations; sludge removal differs.
Water level and pressure drop. A higher water level can intensify scrubbing but also raises resistance and fan power demand at the same airflow. Typical collector pressure drop is about 1,500–2,000 Pa; under higher-resistance conditions it may approach 3,000 Pa. Actual values depend on the model, airflow and operating water level.
01
Dust-laden air enters
The extraction fan generates negative pressure, drawing dust-laden fumes from the production process through the inlet and into the specially shaped airflow passage.
02
The wave generator raises rolling waves
Air accelerates through the narrow passage of the stationary wave generator and strikes the water surface, raising vigorous, continuously rolling waves and abundant splashes that bring the dust-laden air into close contact with water.
03
Dust meets the turbulent wash
Rolling water and bubbles bring dust-laden air into close contact with water. Captured particles return to the tank with the water and settle as sludge.
04
Mist is separated
After the scrubbing zone, the airstream passes through mist eliminator baffles. Entrained droplets are removed and drain back to the tank before air exits.
05
Sludge is removed
In the C type shown, a bottom chain scraper conveys settled sludge toward the discharge point.
06
Water level is maintained
Tank water is reused. A float level control opens the make-up water solenoid valve when evaporation or sludge discharge lowers the water level.
04 / MODEL SELECTION
One Airflow Selection Table for B, C and D
B, C and D use the same airflow sizing range. Choose the required total airflow, then select the sludge-removal design according to the application. C and D are the main choices for larger duties; B is usually selected for smaller installations where manual sludge removal is practical.
Read the model: EHWD-48 indicates an airflow size; B, C or D identifies the sludge-removal design. Size 48 is the largest single collector listed here. Higher sizes are total system capacities made up of separate collectors operating in parallel.
EHWD 1.5–44
Sizes 1.5–44 · one independent collector per row
EHWD size
Airflow (m³/h)
Arrangement
Fan power (kW)
EHWD-1.5
2,520–3,024
1 collector
4–5.5
EHWD-2.5
4,200–5,040
1 collector
5.5–7.5
EHWD-4
6,720–8,064
1 collector
7.5–11
EHWD-6
8,000–12,096
1 collector
11–18.5
EHWD-8
13,440–16,128
1 collector
18.5–22
EHWD-12
20,160–24,192
1 collector
22–37
EHWD-16
26,880–32,256
1 collector
37–45
EHWD-20
33,600–40,320
1 collector
45–55
EHWD-24
40,320–48,384
1 collector
45–55
EHWD-28
47,040–56,448
1 collector
55–75
EHWD-32
53,760–64,512
1 collector
55–75
EHWD-36
60,480–72,576
1 collector
90–110
EHWD-40
67,200–80,640
1 collector
90–110
EHWD-44
73,920–88,704
1 collector
110–132
B is usually selected up to about 20,000 m³/h because its settled sludge is removed manually.
EHWD 48–240
Size 48: single collector · larger sizes: parallel systems
EHWD size
Airflow (m³/h)
Arrangement
Fan power (kW)
EHWD-48
80,640–96,768
1 collector
132–160
EHWD-56
94,080–112,896
2 × EHWD-28
160–200
EHWD-64
107,520–129,024
2 × EHWD-32
185–250
EHWD-72
120,960–145,152
2 × EHWD-36
200–280
EHWD-80
134,400–161,280
2 × EHWD-40
250–355
EHWD-96
161,280–193,536
2 × EHWD-48
280–400
EHWD-108
181,440–217,728
3 × EHWD-36
On request
EHWD-120
201,600–241,920
3 × EHWD-40
On request
EHWD-132
221,760–266,112
3 × EHWD-44
On request
EHWD-144
241,920–290,304
3 × EHWD-48
On request
EHWD-160
268,800–322,560
4 × EHWD-40
On request
EHWD-176
295,680–354,816
4 × EHWD-44
On request
EHWD-192
322,560–387,072
4 × EHWD-48
On request
EHWD-240
403,200–483,840
5 × EHWD-48
On request
The listed parallel arrangements show one matching combination. Fan power from size 108 onward is specified on request.
Model examples: EHWD-8C = Size 8, Type C; EHWD-8D = Size 8, Type D. The final letter identifies the configuration.
Airflow and fan power values are for preliminary selection only. Final selection depends on the required airflow and total system resistance.
Parallel Means Independent Machines
For higher total airflow, the inlet main splits into branch ducts feeding separate collectors. Their outlet branches return to a shared outlet main. The collectors remain complete, independent machines.
The listed fan power ranges are for preliminary reference. Final motor selection depends on total system airflow and pressure losses. The collector itself typically has a pressure drop of about 1,500–2,000 Pa; this is not the full fan system pressure.
Two views of an example multi-unit arrangement. Configuration and unit count are project-specific.
Preparing the public shell…
05 / TYPICAL APPLICATIONS
Wet Dust Collection in Practice
Application examples and configurations for specific process conditions.
Shot Blasting & Abrasive Blasting
When blasting oil-coated steel, heat can generate oil mist that clogs cartridge or bag filters. Hot particles and sparks can also ignite dry filter media. Blasting aluminium, magnesium or titanium requires additional protective measures tailored to the dust and process.
Cyclone pre-separation: Removes coarse particles before wet collection to reduce the dust load at high inlet concentrations.
Venturi-assisted dust capture: An upstream venturi with high-pressure water sprays enhances dust capture in applications requiring variable airflow.
C-type continuous sludge removal: The C-type is recommended for this application. Chain-driven scrapers continuously move settled sludge along the tank bottom and discharge it outside the collector.
Integrated top-mounted filtration
Above the built-in mist eliminator, an optional F9 prefilter and a further optional HEPA filter stack directly on the collector to form one integrated unit. In this configuration, HEPA is fitted only after F9: the F9 prefilter reduces the particle load on the HEPA filter, which captures the remaining fine particles.
7US wet dust collection system supplied for a shot blasting installation. The upstream venturi spray stage is added to suit the process requirements.C-type wet dust collector at a metal grinding and polishing installation: scraper drive and sludge discharge arrangement.
Fine dust from these metals can present fire and explosion hazards. Depending on the metal, alloy and process conditions, contact with water can also release hydrogen. This application combines wet dust capture with continuous sludge removal and dedicated hydrogen venting.
Continuous sludge removal: C-type chain-driven scrapers carry settled sludge out of the tank during operation, limiting sludge build-up and reducing manual cleaning.
Hydrogen venting: A top-mounted vent valve closes while the fan runs, allowing hydrogen to leave with the exhaust airflow. When the fan stops, the valve opens and remains open, providing a bypass route to the exhaust duct around the fan.
Fan and scraper drives: The fan has spark-resistant inlet construction and an explosion-protected motor. The sludge scraper gearmotor also uses an explosion-protected motor.
Electrical components: This configuration includes an explosion-protected control cabinet, make-up water solenoid valve and sludge discharge valve.
Installed inside the workshop, a large C-type self-induced wet dust collector serves multiple grinding stations on this automotive wheel production line. Branch ducts connect the stations to a common extraction main, carrying grinding dust to the collector for wet separation.
The C-type chain scraper continuously removes settled sludge during operation. The collector and ductwork are arranged around the production line, with space for access and maintenance.
Separate systems for different dust types
Collection zones must be defined by dust type, process and fire compartment. Ferrous grinding dust must be collected separately from aluminium or magnesium alloy dust, using independent ductwork and collectors without interconnections between these systems. System zoning and configuration must meet the applicable local safety requirements.
Indoor automotive wheel grinding installation with a C-type wet dust collector.30,000 m³/h C-type wet dust collector at a turbocharger turbine housing foundry.
Automotive Foundry Wet Collection of Oil-Laden Fumes & Dust
A 30,000 m³/h C-type self-induced wet dust collector serves a turbocharger turbine housing foundry, treating oil-laden fumes and particulate emissions from the casting process.
Surface skimming & water reuse: A floating skimmer follows the water level. An air-operated diaphragm pump draws surface contaminants through a bag filter, then returns the filtered water to the inlet sprays for additional dust capture. The filter bag can be removed, cleaned and reused.
Continuous sludge discharge: Chain-driven scrapers move settled oily sludge along the flat tank bottom and up an inclined discharge section, reducing manual cleaning.
Activated carbon adsorption: After mist elimination, the air passes through an upper activated carbon stage for further adsorption of organic vapours. The carbon requires periodic replacement.
Mineral Crushing Wet Collection of Moist Dust
A 40,000 m³/h D-type self-induced wet dust collector serves this mineral crushing installation. Fog cannons and dry-fog sprays suppress dust in the workshop and at key dust-generating points. The extracted air therefore carries moisture and water droplets, making wet collection a suitable choice.
Suited to moist dust: Water captures the dust without bags or cartridges that can suffer from moisture-related build-up and clogging.
Settling & water recirculation: Slurry drains from the lower hoppers into an external settling basin. Clarified water flows into a separate clear-water compartment before returning to the collector for reuse.
Reduced consumable requirements: The self-induced wet collection stage requires no filter bags or cartridges, eliminating their replacement costs and associated maintenance.
40,000 m³/h D-type wet dust collector at a mineral crushing installation.System configuration illustration: D-type wet dust collector with sludge dewatering, water cooling and recirculation.
Vanadium Steel Plant Rod Milling & Slag Quenching
A D-type self-induced wet dust collector handles hot, moisture-laden fumes from these processes, with a separate wastewater treatment system for the large slurry load.
External wastewater treatment: Slurry from the collector enters a separate system with an oil-separation chamber, multi-stage settling compartments, a sludge thickening tank and a clear-water tank.
Sludge dewatering: A filter press dewaters the thickened sludge, separating solids from the water circuit.
Cooling & reuse: Clarified water is cooled in a cooling tower, then pumped back to the wet dust collector.
Lead-Acid Battery Grid Casting Multi-Stage Lead Fume Collection
A 50,000 m³/h EHWD-32DFH wet dust collector treats lead-containing fumes, particulate matter and mould-release emissions from melting, casting and demoulding lead-antimony alloy battery grids.
Wet scrubbing & mist elimination: Wet scrubbing cools the gas stream and captures particles. A baffle-type mist eliminator then removes entrained water droplets.
Integrated staged filtration: Air flows upward through an F9 prefilter, followed by an H14 HEPA final filter. These stages stack directly above the wet collector as one integrated unit, with F9 prefiltration protecting the HEPA filter.
Reported project result: Environmental testing for this installation recorded an outlet concentration of lead and its compounds, expressed as Pb, below 0.1 mg/m³.
50,000 m³/h EHWD-32DFH wet dust collector with integrated F9 and H14 filtration for battery grid casting.
More Applications for Wet Dust Collection
Oily, moist or hot dust? Consider wet collection.
Additional application areas for assessment, with B, C or D selected to suit airflow, dust properties and sludge handling.
Coal Handling & Conveyor Transfers
Belt transfers · loading · screening
Wet dust collection can be considered for coal-handling points, particularly where spray suppression creates moist dust. Selection must address coal wettability, sludge handling and combustible-dust hazards.
Ceramics & Mineral Powders
Batching · mixing · material transfer
For wettable ceramic and mineral dust from powder handling, mixing and transfer points. Water-based capture offers an option where humidity or sticky deposits complicate dry filtration.
Rubber & Plastics Processing
Trimming · finishing · powder handling
An option for wettable dust from rubber and plastics processing, including sticky or oil-laden particulate. Material compatibility and the resulting sludge determine the collection arrangement.
Food & Ingredient Processing
Weighing · blending · packaging
Wet collection may suit selected food-powder and ingredient-handling duties. Product characteristics, hygiene needs and wastewater handling must be considered together.
Chemical Powder Handling
Bag tipping · charging · material transfer
Wet collection can be considered for water-compatible chemical powders, including selected dust from silica and silicate production. Dust chemistry, circulating-water pH and sludge handling are assessed for each process.
Drying & Hot Process Exhaust
Dryers · heated mixing · moist exhaust
Consider wet collection where particulate is carried in hot, humid process air. Gas cooling and circulating-water temperature control are selected for the actual heat load.
Combustible dust: Wet collection requires a dust-specific assessment of water compatibility, ignition and explosion hazards, and any gas generation. Protective measures are selected for the complete system.
06 / CONFIGURATION OPTIONS
Wet Collector Configuration Options
EHWD wet dust collectors can be specified for the dust, airflow, installation layout and discharge requirements of each project. The options below are selected as part of the overall system design.
01
Water-Level Control
Automatic make-up water and low-water protection help maintain the operating water level required for self-induced scrubbing.
02
Sludge Removal
Select manual cleaning for smaller B-type duties, chain scraper discharge for C-type units, or hopper flushing for D-type units according to sludge load and maintenance access.
03
Upstream Pre-Separation
A cyclone separator or Venturi spray stage can be added upstream when the process calls for pre-treatment before wet collection.
04
Secondary Filtration
Where finer downstream filtration is required, an F9 prefilter and H14 HEPA stage can be arranged after mist elimination. The after-filter configuration depends on the process and discharge target.
05
Materials & Water Circuit
Contact surfaces, water treatment, settling and recirculation arrangements are selected for the dust chemistry, sludge properties and operating temperature.
06
Fan & Controls
Fan layout, motor, variable-frequency drive and control cabinet can be specified around the required airflow, system resistance and site power supply.
For combustible metal dust, the full collection system is assessed for material-water compatibility, hydrogen management and application-specific protective measures.
07 / FREQUENTLY ASKED QUESTIONS
Wet Dust Collector FAQ
Quick answers to common questions about self-induced wet collection, model selection and maintenance.
Does self-induced wet collection need a scrubbing pump or spray nozzles?
No. The fan-driven air stream lifts water through the collector’s internal passage to create the primary washing action. An optional upstream Venturi spray stage is a separate system configuration.
Which dusts are suitable for wet collection?
Wettable, sticky or moisture-laden dust may be suitable. For aluminum, magnesium, titanium and other combustible metal dusts, the dust and complete system must be assessed for water compatibility and protective measures.
How are airflow and motor power selected?
The model tables provide starting ranges. The selected airflow and fan motor depend on the dust source, capture layout, ductwork and total system resistance.
How is sludge removed?
The arrangement follows the dust load and machine configuration: manual cleaning, chain scraper discharge or hopper flushing can be specified where appropriate.
What routine maintenance is required?
Maintain the operating water level, check the water circuit and mist eliminator, and remove accumulated sludge. The cleaning schedule depends on dust loading and operating hours.
Discuss Your Wet Collection Project
Share the dust type, required airflow, site layout and available power supply. We can review an EHWD configuration for your application.
