Industrial scrubbers are used in many processing environments to remove contaminants from gas streams. Depending on the application, scrubbers may handle dust, chemical compounds, particulate matter, acidic gases, moisture, and other process contaminants.
As these materials are captured, deposits can accumulate on internal surfaces and components.
If buildup becomes excessive, it can affect airflow, equipment performance, inspection access, and maintenance requirements.
Industrial scrubber cleaning helps remove accumulated deposits and keeps the equipment prepared for continued operation and scheduled maintenance.
What Is an Industrial Scrubber?
An industrial scrubber is a pollution-control or process system designed to remove selected contaminants from a gas stream.
Different scrubber designs can use liquid, chemical solutions, or other mechanisms to capture unwanted materials.
The equipment may include:
- Scrubbing chambers
- Spray systems
- Nozzles
- Internal packing
- Demisters
- Duct connections
- Collection areas
Because these components interact continuously with contaminated process streams, deposits can gradually develop.
Why Scrubbers Need Cleaning
Scrubbers can collect material as part of their normal operation.
Particulates may settle on internal surfaces, while minerals can form scale when process liquids evaporate or change concentration.
Chemical residue may also accumulate depending on the process.
Excessive buildup can contribute to:
- Restricted airflow
- Reduced process efficiency
- Blocked nozzles
- Fouled internal components
- Increased maintenance requirements
- Difficult inspections
- Unplanned downtime
Cleaning helps restore access to internal surfaces and components.
Common Deposits Found in Scrubbers
The type of buildup depends on the application.
Potential deposits include:
- Mineral scale
- Solids
- Dust
- Sludge
- Chemical residue
- Corrosion products
- Process contaminants
Because different deposits respond differently to cleaning methods, identifying the material before starting the project is important.
Cleaning Scrubber Internals
Scrubber internals can be difficult to clean because of their configuration.
Spray nozzles, packing, demisters, ducts, and collection areas may require different cleaning approaches.
A cleaning contractor should evaluate the equipment design before selecting the method.
The objective should be to remove deposits effectively without damaging sensitive internal components.
High-Pressure Water Cleaning
High-pressure water can be suitable for removing certain deposits from scrubber surfaces and components.
RHI provides industrial high-pressure water cleaning for industrial applications.
The appropriate equipment and pressure depend on the scrubber construction and the material being removed.
Chemical Cleaning for Scrubber Deposits
Chemical cleaning may be considered when mineral or chemical deposits are difficult to remove mechanically.
RHI provides industrial chemical cleaning services for industrial applications.
Chemical treatment should be selected carefully based on deposit chemistry, equipment materials, worker safety, and waste-management requirements.
When Should a Scrubber Be Cleaned?
Cleaning may be appropriate when the facility notices changes in performance or when scheduled maintenance requires access to the equipment.
Potential indicators include:
- Increased pressure drop
- Reduced airflow
- Blocked spray nozzles
- Visible deposits
- Increased maintenance requirements
- Reduced cleaning efficiency
- Unusual process readings
Not every performance issue is caused by deposits, so facilities should evaluate the equipment before scheduling cleaning.
Scrubber Cleaning Before Inspection
Cleaning can make internal inspection easier.
Deposits may cover corrosion, surface damage, blocked components, or other conditions that maintenance teams need to evaluate.
A clean surface can provide inspectors with better access and visibility.
Where nondestructive testing is required, proper surface preparation can also be important. RHI offers NDT testing services for industrial inspection applications.
Safety Considerations
Scrubbers can contain chemical residue and contaminated materials.
Before cleaning, the facility should determine what substances may remain inside the equipment.
Potential hazards can include:
- Chemical exposure
- Toxic residue
- Confined-space conditions
- Slippery surfaces
- High-pressure water
- Residual process gases
- Contaminated wastewater
The equipment should be appropriately isolated and prepared before cleaning begins.
Site-specific safety procedures, PPE, atmospheric testing, and ventilation may be required depending on the project.
Cleaning During Shutdowns
Major scrubber cleaning is often easier to coordinate during a planned shutdown.
During a shutdown, equipment can be isolated and maintenance personnel can access components that may not be available during normal production.
Cleaning can be coordinated with inspections, repairs, nozzle replacement, packing maintenance, and other activities.
RHI’s industrial shutdown planning guide explains how maintenance managers can coordinate multiple activities during limited shutdown windows.
Wastewater and Waste Handling
Scrubber cleaning can generate wastewater, solids, scale, sludge, or chemical residue.
Waste should be characterized and managed according to the facility’s procedures and applicable requirements.
Planning waste handling before cleaning starts can prevent delays after the equipment has been cleaned.
Choosing an Industrial Scrubber Cleaning Contractor
Facility managers should look for a contractor with experience in industrial cleaning and the equipment necessary for the specific scrubber application.
Important considerations include:
- Experience with industrial process equipment
- High-pressure cleaning capability
- Chemical cleaning capability
- Safety procedures
- Waste handling
- Inspection support
- Shutdown coordination
RHI’s industrial services provide specialized cleaning solutions for industrial facilities.
Final Thoughts
Industrial scrubber cleaning helps facilities manage scale, solids, chemical residue, and other deposits that can accumulate during normal operation.
Regular assessment and planned cleaning can help maintain access to internal components and reduce the risk of buildup creating larger maintenance problems.
The most effective approach is to identify the type of deposit, select an appropriate cleaning method, establish safety controls, manage waste properly, and coordinate the project with inspection and maintenance activities.