三方機械工業股份有限公司

1. Introduction

With the increasingly severe problem of atmospheric environmental pollution, the requirements for industrial waste gas treatment technology are also continuously improving. Traditional dust removal devices, such as cyclone dust collectors, bag filters, and electrostatic precipitators, although having certain advantages, still show obvious shortcomings when facing the treatment of fine particulate matter, volatile organic compounds (VOCs), and high-humidity, high-adhesion exhaust gases.

The hybrid wet electrostatic scrubber dust removal device integrates the working principles of wet scrubbing and electrostatic dust removal. It can efficiently capture dust particles, fine mist, and gaseous pollutants at the same time, achieving a significant improvement in dust removal efficiency and purification effect.

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2. Traditional Dust Removal Devices

2.1 Structural Characteristics

• Cyclone dust collector: using centrifugal force to separate large-particle dust.
• Bag filter: relying on fiber filter materials to intercept particles.
• Electrostatic precipitator (dry type): using high-voltage electrostatic field to capture charged particles.

2.2 Structural Process

These devices all have their own scope of application:

• Cyclone dust collector is suitable for coarse particle dust.
• Bag filter is suitable for dry dust of moderate particle size.
• Dry electrostatic precipitator is suitable for high-concentration, dry dust.

However, in conditions such as humid, adhesive dust, submicron particles, and VOCs treatment, they are often insufficient.

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3. Shortcomings of Traditional Devices

• Cyclone dust collector: poor effect on fine particles (<5 µm).
• Bag filter: prone to blocking under humid conditions, frequent replacement of filter bags.
• Dry electrostatic precipitator: spark discharge is easy when humidity is high, efficiency decreases.
• In the treatment of VOCs, the above three methods are all ineffective.

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4. Technical Highlights of Hybrid Wet Electrostatic Scrubber

4.1 Working Principle

The device first uses liquid washing to make dust, mist, and VOCs in the exhaust gas dissolve, absorb, or condense into larger droplets.
Then, through electrostatic field action, particles and droplets are charged and further captured on the electrode plate, achieving dual removal of particulate matter and gaseous pollutants.

4.2 Innovation Points

• High-efficiency composite dust removal: combination of mechanical washing + electrostatic collection.
• Anti-blocking: no filter bag, no blocking problems.
• VOC simultaneous removal: liquid absorption and electric field enhancement effect.
• Adaptability to complex exhaust gas: suitable for high humidity, sticky, high temperature exhaust gas.

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5. Electrochemical Mechanism and Technical Advantages

5.1 Electrochemical Principle

• Electrolysis of water generates hydroxyl radicals (•OH), which have strong oxidation ability and can decompose VOC molecules.
• At the same time, ions produced by electrochemical reaction can promote coagulation of fine particles, improving dust removal efficiency.

5.2 Technical Advantages

• Dust removal efficiency > 95%, VOC removal efficiency > 90%.
• Can capture particles of nanometer level.
• Low resistance, energy saving.
• Has both “purification” and “deodorization” effect.

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6. Market Application Value

6.1 Fields of Use

• Petrochemical industry
• Coating, spraying, printing
• Pharmaceutical, pesticide
• Metallurgy, building materials, waste incineration

6.2 Application Value

• Meet strict emission standards such as Comprehensive Emission Standard of Air Pollutants (GB 16297-1996).
• Help enterprises pass environmental acceptance and avoid penalties.
• Improve corporate social image and ESG performance.

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7. Special Chapter: VOCs Treatment

Volatile organic compounds (VOCs) are important precursors for ozone and PM2.5 formation, which are strictly controlled worldwide.
Traditional methods such as adsorption, condensation, and combustion all have limitations:

• Adsorption: need frequent regeneration.
• Condensation: only effective for high-concentration exhaust gas.
• Combustion: high energy consumption, secondary pollution.

The hybrid wet electrostatic scrubber device, through liquid absorption + electrochemical oxidation + electrostatic collection, realizes efficient VOC removal with lower energy consumption, and is especially suitable for low- and medium-concentration, large-volume industrial exhaust gas treatment.