What are the advantages of a wet electric demister for treating sticky particulate matter?
Publish Time: 2025-09-17
In industrial waste gas treatment, flue gas often contains highly adhesive particles such as tar, acid mist, oil mist, asphalt fumes, and resin particles. These substances are not only difficult to remove with traditional mechanical dust removal methods, but also easily accumulate within the equipment, leading to blockage, corrosion, and reduced operating efficiency. Dry dust removal equipment faces significant challenges when handling such pollutants: sticky particles easily adhere to filter bags or plates, making cleaning difficult, increasing pressure differentials, causing electric short circuits, and even system downtime. In contrast, the wet electric demister, with its unique "water film cleaning" mechanism and moist operating environment, demonstrates irreplaceable technical advantages in treating sticky particulate matter, making it a key purification device in industries such as chemical, coking, metallurgy, and waste incineration.
1. Water Film Flushing Mechanism: Completely Removing Sticky Deposits
The core advantage of the wet electric demister lies in its continuous or periodic water film flushing system. The discharge and collecting electrodes (typically tube-bundle or plate-type) within the equipment use a high-voltage electric field to charge particulate matter in the flue gas and attract it to the electrode surfaces. Because the flue gas is saturated and wet, the electrode surfaces are always covered with a uniform water film. Once adsorbed, sticky particles do not form dry, hard deposits like in dry equipment. Instead, they are immediately engulfed, moistened, and softened by the water film. Subsequently, through timed spraying or gravity flushing, the water film washes these sticky particles to the bottom of the equipment, where they are discharged with the circulating water, achieving online dust removal. This process prevents the long-term accumulation of sticky particles on the electrode plates, fundamentally resolving common problems such as "field sticking" and "filter bag clogging," ensuring continuous and stable operation of the field and maintaining high purification efficiency.
2. A humid environment suppresses re-entrainment and secondary pollution
In dry dust removal systems, the cleaning process often uses backflow or vibration, which can easily cause captured dust to be re-entrained, creating "secondary dust" and reducing overall dust removal efficiency. The wet electric demister operates in a fully wet state, achieving flue gas humidity near 100%. Once captured, particulate matter remains moist and cannot resuspend. Even during the flushing process, particulate matter is removed as a slurry, without generating aerosols or fly ash. This effectively eliminates secondary pollution and is particularly suitable for applications requiring extremely high emission concentrations.
3. Adapting to Complex Components, Efficiently Removing Multiple Sticky Pollutants
The wet electric demister not only treats single sticky particles but also removes multiple, complex pollutants simultaneously. For example, in a coking plant's coal gas purification system, flue gas contains tar mist, naphthalene crystals, sulfides, and fine carbon black particles. These substances adhere to each other, forming a complex contaminant that is extremely difficult to treat. The wet electric demister uses a high-voltage electric field to charge various particles and migrate them to the plates. The water film then flushes and removes them uniformly, achieving integrated purification. Similarly, SO₃ acid mist generated during sulfuric acid production forms sulfuric acid droplets upon cooling, which are highly corrosive and sticky. A wet electric demister can increase its capture efficiency to over 99%, preventing equipment corrosion and air pollution.
4. Corrosion-Resistant Materials and Structural Design Ensure Long-Term Operation
For applications where sticky particles are often accompanied by strong acids, bases, or organic solvents, wet electric demisters are typically constructed of corrosion-resistant materials such as 316L stainless steel, conductive fiberglass reinforced plastic (FRP), lead sheet, or titanium alloy. These materials not only offer excellent resistance to chemical attack but also ensure stable electrical conductivity. Furthermore, the bundled tube design enhances the flushing effect of the water flow, reduces dead spots, and prevents the accumulation of sticky particles in corners, further improving equipment reliability and maintenance intervals.
5. Suitable for High-Humidity and High-Temperature Flue Gas Environments
Many processes that generate sticky particles inherently emit high-temperature and high-humidity flue gases. The wet electric demister requires no additional cooling or dehumidification and can be directly integrated into the system, avoiding condensation and corrosion caused by temperature differences. It operates over a wide temperature range, adapting to flue gas conditions of 50–80°C or even higher. It is particularly suitable for use with upstream desulfurization towers, scrubbers, and other equipment to form a complete wet purification chain.
The wet electric demister utilizes a synergistic mechanism of "electric field capture + water film removal" to perfectly solve the cleaning challenges associated with sticky particulate matter treatment. Its continuous online cleaning, zero secondary dust generation, coordinated removal of multiple pollutants, and high corrosion resistance ensure excellent adaptability and stability when dealing with stubborn pollutants such as tar, acid mist, and oil mist.
