Parallel Damper for Power Plants

UGES Parallel Dampers provide accurate volume regulation of combustion air and flue gas in U.S. thermal power generation. With synchronized parallel blades and modulating actuator control, these dampers optimize FD fan, ID fan, and PA fan airflow to maintain boiler efficiency across varying load conditions.

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Parallel Damper Key Specifications

Blade Material

SA 516 Gr. 70 / Corten-A with stellite-tipped edges for erosion resistance

Temperature Rating

Up to 420°C for hot flue gas; ambient to 80°C for FD and PA fan intake

Actuation Type

Electric multi-turn actuator with 4–20 mA modulating signal and DCS integration

Size Range

1000 mm × 1000 mm to 6000 mm × 4000 mm for large power plant ductwork

Blade Configuration

8 to 24 parallel blades with torque tube linkage for uniform modulation

Pressure Drop

Aerodynamic NACA-profile blades, <20 mmWG pressure drop at full-open rated flow

Industrial Applications

FD Fan Discharge Control
Modulates forced-draft fan discharge volume to maintain optimum combustion air supply across boiler load range from 30% to 100% MCR.
ID Fan Inlet Regulation
Controls induced-draft fan inlet flow to maintain furnace negative pressure, preventing puffing and ensuring stable combustion.
PA Fan Volume Modulation
Regulates primary air fan output to coal mills, adjusting pulverized fuel transport air velocity for varying coal quality and boiler load.

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