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Stainless Steel Wet Scrubber

Stainless steel wet scrubber is an air pollution control device designed to remove pollutants from industrial exhaust gases using a liquid (typically water or a chemical solution). The use of stainless steel makes it highly resistant to corrosion, durable, and suitable for harsh industrial environments. Below is a comprehensive guide to stainless steel wet scrubbers, including their components, working principles, advantages, applications, and maintenance.
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  • XC-1

  • XICHENG

1. Components of a Stainless Steel Wet Scrubber

Component Material Function
Scrubber Tower Stainless Steel (304/316) Resists corrosion and high temperatures, ideal for acidic or alkaline environments.
Spray System Stainless Steel Nozzles + Piping Distributes the scrubbing liquid evenly to maximize gas-liquid contact.
Packing Material Stainless Steel, PP, or PVC Increases the surface area for gas-liquid interaction, improving efficiency.
Demister Stainless Steel or PP Removes liquid droplets from the cleaned gas to prevent liquid carryover.
Recirculation Tank Stainless Steel Stores and recycles the scrubbing liquid, reducing operational costs.
Fan/Blower Stainless Steel Casing Provides the necessary airflow to move exhaust gases through the scrubber.

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2. Working Principle

  1. Gas Inlet: Polluted gas enters the scrubber at the bottom.

  2. Spraying: Scrubbing liquid is sprayed from the top, creating a counter-current flow with the rising gas.

  3. Gas-Liquid Contact: Pollutants (e.g., dust, SO₂, HCl, NH₃) are absorbed or react with the scrubbing liquid.

  4. Demisting: The cleaned gas passes through a demister to remove entrained liquid droplets.

  5. Clean Gas Outlet: Treated gas is released from the top, meeting emission standards.


3. Advantages

  • Corrosion Resistance: Stainless steel (especially 316L) withstands acidic, alkaline, and high-temperature environments.

  • High Efficiency: Effective for removing particulates, acidic gases, alkaline gases, and volatile organic compounds (VOCs).

  • Durability: Long service life with low maintenance requirements.

  • Customizable: Can be tailored to specific gas compositions and flow rates.

  • Eco-Friendly: Scrubbing liquid can be recycled, minimizing water usage.


4. Applications

Industry Target Pollutants Scrubbing Liquid
Chemical SO₂, HCl, NH₃, VOCs NaOH solution, water
Electroplating Acid mist (HCl, H₂SO₄), chromic acid mist Alkaline solution
Pharmaceutical Solvents, acidic gases Water or specialized chemicals
Food Processing Oil mist, odors Water
Metallurgy Dust, SO₂, NOx Alkaline solution

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5. Key Design Considerations

  1. Gas Characteristics: Analyze the gas composition, concentration, temperature, and flow rate to select the appropriate scrubbing liquid and packing material.

  2. Material Selection:

    • 304 Stainless Steel: Suitable for mildly acidic or neutral environments.

    • 316L Stainless Steel: Ideal for strong acids, alkalis, or chlorine-rich environments.

  3. Tower Dimensions: Determine the diameter and height based on gas flow rate and required efficiency.

  4. Spray System Design: Ensure uniform liquid distribution to avoid dry spots.

  5. Demister Type: Choose an efficient demister (e.g., chevron or mesh type) to ensure dry gas emission.


6. Maintenance Tips

  • Regular Inspections: Check the spray system, packing, and demister monthly for blockages or damage.

  • Tank Cleaning: Periodically clean the recirculation tank to remove sludge and prevent clogging.

  • Liquid Replacement: Replace or replenish the scrubbing liquid based on pollutant concentration and treatment efficiency.

  • Corrosion Protection: Inspect stainless steel surfaces regularly and apply anti-corrosion treatments if necessary.


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