Wet ESP systems are an air emission control technology for industrial process gases with sub-micron particulate matter (PM). Particles including sub-micron level, acid mists, condensed organics, sticky/combustible are controlled by wet ESPs.
NESTEC’s Wet Electrostatic Precipitator (Wet ESP) provides high removal efficiency of difficult particulate matter (PM) emissions with a unique design featuring intense electric fields, heavy duty construction and minimal maintenance. Backed by the most knowledgeable and experienced wet ESP team in the industry. We make the best wet ESP in the world!
The NESTEC Wet ESP operates in a wet/saturated environment and functions with residence time in an intense electric field to charge and capture pollutants on to round collection tubes. The tubes are periodically washed with an automated flushing system to remove the particles and slurry from the surfaces. The design has no barriers to gas flow which allows the system to operate with low pressure drop.
NESTEC Wet ESP Systems are utilized in several applications, including;
- Wood dryers for panelboard and wood pellets
- Biomass dryers for biofuels
- Semiconductor fab
- Industrial fryers and smokers
- Industrial boilers and incinerators
- Insulation manufacturing forming and curing
- Acid mist applications
- Blue haze
- Textile mill drying and finishing
- Metallurgical roasters and smelters
- Wet scrubber exhaust polishing
Benefits and Features of the NESTEC Wet ESP
The NESTEC Wet ESP design features a vertical upflow configuration to minimize system pressure drop and eliminate water droplet carryover. Large diameter collection tubes and low ripple power supplies ensure the wet ESP operates at maximum power levels, while the round geometry provides a rugged heavy duty collection tube with an equal electrical field. High intensity rigid mast discharge electrodes, with a unique corona disc configuration, are attached to a high voltage tubular frame with a single oversized bolt that includes a NESTEC Wedge alignment washer to allow independent adjustment.
Low pressure drop, plug resistant gas flow distribution systems ensure gas is equally distributed in the wet ESP for maximum performance. Physical and CFD models back each NESTEC wet ESP system.
- NESTEC large diameter round collection tubes operate with a uniform electric field, outperforming common wall designs like hexagonal or square or smaller diameter tubes. Round tubes are also less susceptible to corrosion and offer far superior durability.
- High intensity rigid mast electrodes with a disc arrangement, unique to NESTEC are attached to a tubular high voltage frame with a single oversized bolt. A NESTEC Wedge is used for independent alignment of each electrode.
- Low ripple power supplies ensure the wet ESP operates at maximum kV (kilovolts) and a high power factor. These include three phase SCR based transformer rectifier (TR) sets and high frequency switch mode power supplies.
- A robust cleaning system is provided with a multi-tier flush system unique to the NESTEC wet ESP. This ensures maximum cleaning while avoiding excess water consumption.
- NESTEC wet ESP systems with multiple electric fields include division walls and isolation dampers. This feature allows online cleaning to occur while minimizing the performance impact and preventing liquid droplet carryover.
- Multiple stainless-steel materials of construction are offered for process driven corrosion resistance, including; 304L and 316L, 2205 and 2507 duplex and several super austenitic alloys.
- NESTEC wet ESP systems are often supplied with a stainless-steel quench duct for evaporative cooling and pre-conditioning of the process gas. NESTEC’s unique design ensures a continuous liquid film on the ductwork, eliminating build-up and duct cleaning maintenance. A series of plug resistant spray nozzles in the quench duct introduce a high volume of recycled water with complete coverage. The result is clean ductwork between the process and the wet ESP.
- NESTEC recycle water systems include specialized low maintenance cone bottom tank designs, solids separation equipment such as centrifuges, screens and strainers, specialized pumps instrumentation and piping recirculation loops.