3-Field Dry Electrostatic Precipitator (ESP) System from Biomass Boiler - (3) NWL 100 kV T/R Sets, Rappers, Hoppers, Ash Conveyor & Control Building

Used 3-field dry electrostatic precipitator (ESP) system, removed from biomass boiler service. The system provided air pollution control by removing particulate (fly ash) from the boiler flue gas. Three electrical fields in series, each powered by its own NWL transformer/rectifier (T/R) set. Electromagnetic rappers dislodge collected ash from the collecting plates into vacuum hoppers, which feed the ash conveyor and silo. A purge air blower/heater keeps the high-voltage insulators in the cold roof clean and dry.

System includes:

• Complete ESP silo/casing structure with stairs, platforms and top exhaust stack

• (3) roof-mounted NWL transformer/rectifier sets with HV bus ducts

• Cold roof

• Electromagnetic rappers

• Purge air blower/heater

• Collecting plates

• Vacuum hoppers

• Ash conveyor

• Insulated EKTO control building with MCC room, server rack, electrical panel and associated electrical units, and two wall-mount HVAC units

NWL transformer/rectifier sets (nameplate of one unit shown): NWL Transformer-Rectifier Set, Model 137631, 86 kVA. Input 400 VAC, single phase, 60 Hz, 215 A. Output 100 kVDC peak (no load) / 59 kVDC average, 1000 mA DC. Class OA, 55°C rise / 40°C ambient. Mineral oil (non-PCB), 135 gal. Weight 3,100 lb (unit shown).

EKTO control building: EKTO Manufacturing Corp. (Sanford, ME), Model 8812, Serial 3736-1-1, approx. 2,000 lb empty weight, 768 cu ft, 208/120 V, 60 Hz.

ESP manufacturer, gas flow (ACFM) and collecting area not confirmed.

Stock #: ESP3S3736. Contact us to schedule inspection.