Cyclone Separator (Primary Separation)
- Principle:Utilizes centrifugal force. The alkali mist gas flow enters the cyclone separator tangentially, rotating at high speed. Heavier alkali droplets are thrown against the wall, colliding and flowing down the wall, separating from the gas.
- Features: Handles large flow rates, high concentrations, and large droplets (typically >10μm). Can be used as pretreatment to reduce the burden on subsequent fine separators. Low pressure loss.
High-Efficiency Demister (Core Separation)
Blade Demister: The most commonly used and core type.
- Principle:Gas passes through a series of closely arranged S-shaped or wavy tortuous channels. Droplets impact the blade surface under inertia, coalesce, and flow down by gravity. For droplets larger than 3-5μm, the removal efficiency can reach over 99%.
- Advantages: Compact structure, moderate pressure drop, not easily clogged, easy to clean, and very suitable for treating alkaline mist containing certain solid particles or easily crystallizing particles.
Wire Mesh Demister:
- Principle: Gas passes through a multi-layered mesh pad woven from fine filaments; droplets collide with, intercept, and coalesce against the filaments.
- Advantages: Extremely high capture efficiency for fine mist droplets of 1-3μm.
- Disadvantages: Easily clogged by sticky substances or crystals; for alkaline mist, if the concentration is high or it contains impurities, careful selection and a flushing system design are required.
Fiber Bed Filter (Deep Separation):
- Principle: Gas passes through a dense filter bed made of ultra-fine glass fiber, plastic fiber, etc., capturing submicron (<1μm) alkaline mist aerosols through diffusion, interception, and inertial collision mechanisms.
- Features: Highest efficiency, reaching over 99.9%, but with a relatively large pressure drop; it is the final fine separation barrier.
Application Areas
Chemical and Pharmaceutical Industries
Reactor exhaust and alkaline washing processes.
Electroplating and Metal Surface Treatment
Concentrated alkaline mist generated during alkaline degreasing and etching processes.
Lithium-ion Battery Manufacturing
Alkaline washing exhaust gas treatment in electrode slurry preparation, coating, and other processes using solvents such as NMP.
Man-made Fiber (Viscose) Production
Treatment of waste gas containing large amounts of alkaline mist and carbon disulfide.
Food Processing
Alkaline steam from cleaning and disinfection processes.
Laboratory Ventilation
Fume hood exhaust gas treatment involving strong alkaline operations.
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