side-products

Wet cleaning equipment

November 29, 2025
admin

Water-cooled air purifiers are     among the most effective and widely used air purification systems in various industries. They remove harmful gases, particles, and toxic fumes. The system uses a gas-liquid purification process to separate pollutants from the airflow, thus significantly contributing to the reduction of harmful emissions into the environment.

How does a wet washing machine work?

Basic operating principle

The operating principle of a wet gas scrubber is based on mass transfer between the gas and liquid phases     . In this system:

  1. The contaminated gas stream enters the device.

  2. A rinsing fluid (usually water or a chemical solution) comes into contact with the gas.

  3. Pollutants transition from the gas phase to the liquid phase.

  4. Clean gas is removed from the system.

  5. Liquids containing impurities are forwarded for treatment or disposal.

The most important mechanisms for pollutant removal:

  • Physical absorption     : Dissolution of impurities in the cleaning fluid.

  • Chemical reaction     : The impurities react with the chemicals in the cleaning fluid.

  • Particle collision and capture     : Floating particles are captured by droplets.

Types of wet washing machines

1. Fill the bed with cleaning agent.

  • Includes a filler layer (contact surface).

  • Suitable for removing dissolved gases.

  • Highly efficient removal of gaseous pollutants

  • Application in the chemical and petrochemical industries

2. Venturi washing machine

  • Special design, narrower neck.

  • The gas flow rate is extremely high (60-120 m/s).

  • Suitable for small particles (less than 1 micrometer).

  • relatively high energy consumption

3. Cyclone washing machine

  • Combination of centrifugal force and liquid flushing

  • Suitable for large particles.

  • Compact design

  • Average pressure drop

4. Spray wash

  • Use the appendix

  • Simple structure

  • Suitable for particles     larger than     10 micrometers.

  • Low maintenance costs

The main components of a wet wash

  1. Contact chamber     : the main contact point between gases and liquids.

  2. Liquid dispensing system     : nozzles or liquid dispensers

  3. Packaging material      (type of packaging): increases the contact area

  4. Droplet separator      (dryer): prevents droplets from being expelled along with the gas.

  5. Liquid circulation tank     : used for storing and circulating the washing liquid.

  6. Circulation pump     : Pumps the cleaning fluid.

  7. pH control system     : regulates the acidity or alkalinity of the cleaning solution.

Industrial applications of wet washbasins

1. Chemical and petrochemical industry

  • Removal of acidic gases (HCl, HF, H2SO4)

  • Ammonia emission control

  • Reactor gas cleaning

2. Metallurgical industry

  • Gas cleaning of the melting furnace

  •   Sulfur oxide  –  Emission control  

  • Removal of heavy metals from exhaust gases

3. Food industry

  • Odor control in the production line

  • Removal of volatile organic compounds

  • Process gas purification

4. Power plant

  • Fluorescent Gas Desulfurization (FGD) System

  • Nitrogen oxide emission control

  • Removal of suspended particles

5. Pulp and paper industry

  • Control of sulfide emissions

  • Removal of chemical fumes

  • Reducing pollutants during cooking

Advantages of wet washing machines

  1. High efficiency     : Ability to remove up to 99% of gaseous and solid pollutants.

  2. Flexibility     : the ability to adapt to different input air temperatures.

  3. Simultaneous removal     : Particles and gases can be removed simultaneously.

  4. Acid gas control:     Excellent     neutralization performance for acidic gases.

  5. Gas cooling     : Reduction of the temperature of high-temperature gases during the cleaning process.

Disadvantages and problems of washing machines with wet wash function

  1. Wastewater generation     : A wastewater treatment system is required.

  2. Energy consumption     : especially with Venturi tube types

  3. Corrosion problem    : Corrosion-resistant materials are needed     .

  4. Sediment formation     : Blockages can occur in nozzles and containers.

  5. Maintenance costs     : Regular maintenance  is required.

Design and selection of wet washing machines

Key design parameters:

  1. Inlet gas flow rate      (m³/hour)

  2. Pollutant concentration      (parts per million or mg/m³)

  3. Type of pollutant      (gas, particles or mixture)

  4. Inlet gas temperature      (°C)

  5. Humidity of the inlet gas      (%)

  6. Required separation efficiency      (%)

  7. Chemicals in the gas

Design calculations:

  • Calculate the tower dimensions based on the gas velocity.

  • Determine the required fill level

  • Calculation of detergent consumption (liquid-gas ratio)

  • Low voltage of the computer system

  • Sizing of water pumps and accessories

Optimal maintenance and operation

Preventive maintenance plan:

  1. Regular checks     :

    • Nozzle check

    • Check the condition of the packaging.

    • Corrosion testing

  2. System cleaning     :

    • Tablets for packaging cleaning

    • Cleaning nozzle

    • Drainage   of sedimentary rock

  3. Control of operating parameters     :

    • pH value of the cleaning solution

    • chemical concentration

    • Pressure and flow of gases and liquids

Solutions for common problems:

  1. Reduced efficiency     :

    • Check the concentration of the cleaning solution.

    • Control of the  fluid flow

    • Make sure the nozzle is not clogged.

  2. Increased drop in blood pressure     :

    • Make sure there are no foreign objects in the packaging.

    • Fluid level control

    • Check the condition of the defrosting system.

  3. Fall while throwing     :

    • Check the condition of the defrosting system.

    • Accelerator pedal control

    • Checking the liquid flow

New technology for wet air scrubbers

  1. Application of new materials     :

    • High-performance packaging

    • Corrosion-resistant composite materials

    • Nano dirt-repellent coating

  2. Intelligent control system     :

    • Continuous monitoring of pH value and concentration

    • Online monitoring system

    • Automatic adjustment of operating parameters

  3. Optimal design     :

    • Reduction of energy consumption

    • Reducing water consumption

    • Improve communication quality

Comparison of wet scrubbers and other gas purification technologies

Comparison criterion Wet cleaning device Bag filter Carbon-absorbing material Electrostatic precipitator
Particle separation efficiency High (up to 99%) Very large fewer higher
Gas removal efficiency Very large zero higher zero
Energy consumption half fewer fewer higher
Investment costs half higher higher Very large
Operating costs higher half higher half
limit Wastewater treatment Sensitive to moisture It needs to be replaced. Applies only to particles

In conclusion

Water-cooled air purifiers – a highly advanced and flexible air purification technology – are used in various industries. This system can remove fine dust and gaseous pollutants simultaneously, offering unique advantages. It is therefore an ideal solution for diverse industrial applications.     Optimal design, the right choice of materials     , and the implementation of preventative maintenance programs can significantly improve the efficiency and lifespan of these systems.

Recent technological advances in materials, control systems, and process integration have paved the way for a promising future for wet scrubbers. These advances offer the potential to increase efficiency, reduce energy consumption, and lower operating costs. Selecting and designing a suitable wet scrubber system requires a comprehensive analysis of operating conditions, pollutant types and concentrations, and environmental regulations, ideally under the guidance of experts in the relevant fields.