Ducon provides the following types of Flue Gas Desulfurization Systems:
All Ducon Flue Gas Desulfurization systems are custom designed to remove sulfur dioxide from flue gases using a variety of reagents, such as: caustic, lime, limestone, ammonia, fly ash, magnesium oxide, soda ash, sea water or double alkali. Ducon can provide systems that recover sulfur, sulfuric acid or make dry gypsum from the waste product.
Ducon has supplied wet FGD systems on over 20,000 megawatts of combined power plant capacity. Ducon FGD systems can achieve over 99% sulfur dioxide removal efficiency. Ducon Flue Gas Desulfurization systems can also recover up to 90% of oxidized mercury in the flue gas.
Depending upon the reagent utilized, Ducon can select a packed tower, a spray tower or a Ventri-Rod Absorber (VRA™) (a proprietary Environeering unit) for the wet FGD application. For Dry Flue Gas Desulfurization systems, Ducon uses its proprietary two-fluid nozzle DRX-25 to atomize feed slurry in the spray reactor. Ducon can also provide a Circulating Reactor Dry FGD system suitable for applications of up to 3% sulfur coal and by utilizing dry lime, it can provide up to 97% SO2 removal efficiency. Ducon provides either a bag house filter or an electrostatic precipitator for duct collection downstream. Ducon works with reputable vendors to provide gas-to-gas heat exchangers, fans, controls, and reagent handling and feeding systems.
Ducon has the capability to provide a complete global turnkey installations including effluent treatment systems.
LIMESTONE FGD
FEATURES
- High efficiency absorber design provides up to 98% sulfur dioxide removal with limestone
- Free from scaling & plugging, hence very low maintenance
- Low power consumption
- Ducon’s proprietary Ventri Rod deck provides operation with lower L/G ratio
- Ducon’s proprietary nozzles deliver overlapping spray coverage to deliver high removal efficiency.
- Low blow down rate & water usage
- Low limestone consumption rate
- Wallboard grade gypsum by-product
- Provides up to 99.9%+ particulate removal efficiency.
- Very low maintenance and operating expenses
SEAWATER FGD
FEATURES
- Used for Sulfur dioxide removal
- Simple operation requiring no chemicals
- Seawater pH of 8.0-8.5 used for alkalinity instead of any chemicals
- Ducon Q-pack packing provides high removal efficiency and low pressure drop
- Ducon seawater FGD has the lowest power consumption.
- No sludge; aerated water discharged to sea
- Low investment cost and minimal controls
ADVANTAGES
- Requires only seawater and air.
- No waste is formed, so no waste handling required.
- No reagents or additional chemicals.
- Has lower capital and operating costs than other types of FGD systems.
- The absorbed SO2 is oxidized to harmless sulfate ion, a natural constituent of seawater.
Dry FGD
FEATURES
The Ducon Dry FGD (Dry Sorbent Injection) is used to remove Sulfur dioxide, hydrogen chloride, and other toxic components from flue gases by injecting dry lime, trona, or soda ash ahead of a ESP or baghouse. This is a low cost alterantive for applications that do not have high removal efficiency requirements. Ducon can also recover Mercury, Dioxins, and other heavy metals by injecting impregnated activated carbon.
ADVANTAGES
- Upto 80% SO2 removal
- Dry waste product
- Over 99.99% particulate removal
- Also remove mercury, dioxins and metals
- No Stack Plume
- No sludge processing equipment
Ducon’s Semi-Dry (SDR) FGD system use its proprietary two-fluid nozzle DRX-25 to atomize lime feed slurry in a spray reactor. A SDR FGD system can provide upto 99% sulfur dioxide removal efficiency with comparable cost to a wet system; however producing a dry waste product which could be used in gypsum board manufacturing or fertilizer operations. Ducon provides either bag house filter or Electrostatic Precipitator for dust collection downstream. Ducon provides complete turn-key installations with all the required material handling systems.
