Industrial wet scrubber for waste gas

Industrial wet scrubber description

An industrial wet scrubber is vital in controlling air pollution in various industries by removing contaminants from waste gases before they are released into the atmosphere. This system captures and neutralizes gases, vapors, and particulate matter from industrial exhaust streams. Here’s a detailed look at how industrial wet scrubbers work, their components, types, and applications:

Components of an Industrial Wet Scrubber System

1. Scrubber Vessel: The main chamber where the gas stream contacts the scrubbing liquid.
2. Spray Nozzles: Distribute the scrubbing liquid into fine droplets to maximize contact with the gas.
3. Packing Material: In packed-bed scrubbers, this material increases the surface area for gas-liquid contact.
4. Gas Inlet and Outlet: Points for the gas to enter and exit the scrubber.
5. Scrubbing Liquid Inlet and Outlet: For the entry of fresh scrubbing liquid and the removal of spent liquid.
6. Pump: Circulates the scrubbing liquid through the system.
7. Mist Eliminator: Captures droplets of scrubbing liquid that may be entrained in the exiting gas stream.
8. Activated carbon air filter: Used to absorb the gas smell, color, impurities, etc., and purify the VOC waste gas.
9. Fan or Blower: Ensures that the gas stream flows through the scrubber.
10. Automatic dosing device: When treating acidic and alkaline waste gas, the PH value of the liquid in the scrubber tank can be detected and chemicals can be added automatically.
11. Electric control box: control the start and stop of the wet scrubber system.

Industrial wet scrubber working principle

1. Gas Introduction: The polluted gas enters the scrubber vessel.
2. Gas-Liquid Contact: The scrubbing liquid is sprayed or distributed to contact the gas. In packed-bed scrubbers, the gas passes through packing material coated with scrubbing liquid.
3. Absorption and Reaction: The pollutants in the gas are absorbed by the scrubbing liquid. Chemical reactions can neutralize specific pollutants (e.g., acidic gases reacting with alkaline solutions).
4. Activated carbon adsorption: The gas exits the scrubber through a mist eliminator and enters the activated carbon air filter for secondary purification, removing the smell, color, etc.
5. Clean Gas Exit: The cleaned gas exits the carbon air filter and enters the atmosphere through the fan and chimney pipe.
6. Spent Liquid Removal: The scrubbing liquid, now containing absorbed pollutants and byproducts, is removed and treated or disposed of.

Types of Industrial Wet Scrubbers

1. Spray Tower Scrubbers: Utilize simple towers where the gas passes counter-current to the spraying liquid.
2. Venturi Scrubbers: Increase gas velocity through a constricted throat to create a fine mist, enhancing gas-liquid contact.
3. Packed Bed Scrubbers: Utilize packing material to increase the surface area and contact time between gas and liquid.
4. Impingement Plate Scrubbers: Use plates to create turbulence and improve gas-liquid mixing.
5. Cyclonic Scrubbers: Combine the action of a cyclone with liquid spraying to capture particles and gases.

Our industrial wet scrubber is type 1 and type 3.

Advantages

1. High Efficiency: Capable of achieving high removal efficiencies for a broad range of pollutants.
2. Versatility: Effective for gases, vapors, and particulate matter.
3. Cooling Effect: Helps to cool the gas stream, which can be advantageous in some processes.
4. Adjustability: Operating conditions such as liquid flow rate and pH can be modified to optimize performance for different pollutants.
5. Features: We use PP polypropylene material, so it’s acid-alkali and corrosion-resistant.

Disadvantages

1. Liquid Waste Generation: Produces a liquid waste stream that requires appropriate treatment.
2. Maintenance: Regular maintenance is necessary to prevent clogging of nozzles and packing materials.
3. Safe working temperature: we use PP polypropylene material, so the gas temperature must be less than 80℃, otherwise, a condenser is required to cool down first.

Example of Industrial Wet Scrubber for SO2 Removal

1. Gas Inlet: Waste gas containing SO2 enters the scrubber.
2. Scrubbing Liquid: An alkaline solution, such as a lime or limestone slurry, is sprayed into the gas stream.
3. Absorption: SO2 is absorbed by the liquid and reacts to form calcium sulfite (CaSO3) or calcium sulfate (CaSO4), then enters the carbon air filter for purifying again.
4. Clean Gas Exit: The gas, now with lower SO2 content, exits through the fan and chimney pipe.
5. Spent Liquid: The liquid, now containing reaction byproducts, is removed and treated.

Applications

1. Power Plants: Used to treat flue gas from coal-fired power plants, removing SO2 and other pollutants.
2. Chemical Manufacturing: Controls emissions from chemical production processes.
3. Metal Processing: Employed in smelting, refining, and other metal processing operations to control emissions.
4. Food and Beverage Industry: Used to control odors and emissions from various processes.
5. Pulp and Paper Industry: Removes pollutants from processes like bleaching and pulping.
6. Etc.

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