FGD SYSTEM

A: The main purpose of an FGD system is to reduce sulfur dioxide from flue gas before discharge through the stack. It protects the plant’s environmental compliance position and reduces acidic gas emissions from boilers, furnaces, kilns and industrial combustion systems.

A: The key inputs are flue gas flow rate, inlet SO₂ concentration, required outlet limit, gas temperature, dust load, moisture, fuel type, sulfur variation, plant layout, water availability and waste handling route. Without these inputs, the design cannot be safely finalized.

A: Not always. A bag filter is required when the FGD design produces or carries dry particulate matter that must be captured before stack discharge. Semi-dry and dry systems commonly need downstream particulate collection. Wet systems may require mist eliminators and separate solids handling instead.

A: Particulate Matter (PM): Captured along with the scrubbing slurry, significantly reducing fine particle emissions.
Hydrochloric Acid (HCl) and Hydrofluoric Acid (HF): Strong acids effectively absorbed in alkaline scrubbing solutions.
Trace Metals: Elements like mercury (Hg), selenium (Se), arsenic (As), and others can be partially captured depending on the scrubber chemistry and conditions.

A: FGD systems depend on the continuous, reliable operation of large motors (pumps, fans) and sensitive electronics (controls, instrumentation, CEMS). Voltage fluctuations can cause:
Motor Tripping: Leading to immediate FGD process shutdown.
Control System Failure: Causing loss of control over critical parameters (reagent dosing, pH, flow).
Instrumentation Errors: Resulting in unreliable data and potential non-compliance reporting.
Component Damage: Repeated voltage issues shorten equipment lifespan. Voltage stabilizers mitigate these risks by ensuring a consistently clean and stable voltage supply to all critical FGD components, preventing costly downtime and protecting the significant investment in pollution control equipment.