Technology

1. Core Working Principle

ESP is a particulate removal device relying on electrostatic attraction. It consists of charging wires and collecting plates with high-voltage electric field.

Airborne dust, pollen, smoke & droplets get negatively charged when passing the ionizing wires, then are attracted and trapped by positive collecting plates. Contaminants are later washed or brushed off for disposal, leaving clean airflow. The static attraction logic works the same as statically charged balloons sticking to walls.

2. Two Main ESP Types

Plate ESP (Two-stage Design)

Separates particle charging & collection into independent zones, which drastically cuts ozone output. Widely used for commercial HVAC, offices & light industrial ventilation.

Wet ESP (WESP)

Adopts tubular structure with water flushing system, specially for industrial flue gas containing acid mist, liquid droplets & combustible fumes. Captured pollutants form slurry and get washed away by water spray.

3. Core Application Scenarios

Industrial heavy-duty: Power plants, boilers, furnaces, factory flue gas smoke & ash filtration (original mainstream usage since 1907, invented by Frederick Cottrell).

Commercial/Residential HVAC: Duct-mounted electronic air cleaners for offices, shops, houses.

4. Critical Drawback: Ozone Hazard (Key selling point contrast for your HVAC products)

High-voltage corona discharge inevitably produces ozone as a by-product:

Ozone irritates respiratory tracts, lungs & skin; long-term inhalation triggers asthma, bronchitis and lung damage.

Single-stage industrial ESP generates massive ozone, completely unsafe for occupied indoor spaces. Even two-stage low-ozone ESP still releases trace ozone.

Limitations on purification performance:

Only captures solid particles (dust, mold, pollen); cannot eliminate VOC, gas odor & tiny ultrafine particles efficiently.

Filtration efficiency drops sharply once collecting plates accumulate dust.

Manual cleaning of plates creates secondary dust pollution during maintenance.

5. ESP vs Ionizer (Easy-to-distinguish comparison)

ESP: Draws air in, charges particles, traps pollutants inside plates, discharges purified air.

Ionizer: Only releases ions into room air without capturing particles; charged dust simply sticks to walls, furniture instead of being removed.

6. Safe Alternative Solution (Match your HEPA/Composite Filtration HVAC Units)

Unlike ESP with ozone risks, mechanical multi-stage filtration systems (pre-filter + HEPA + activated carbon) offer zero ozone emission, 99%+ fine particle removal, and effective odor & VOC absorption — ideal for long-term indoor commercial & residential ventilation.