ACID GAS CONTROL
Wet Flue Gas Desulfurization
benefits and Features
- >98% removal of sulfur dioxide (SO2)
- Integral absorber and recycle tank
- Self-supported internal recycle headers provide optimal slurry distribution within the absorber zone
- Open tower and Dual Flow Tray designs
- Absorber vessels are custom designed to meet clients’ needs
- Experience with all absorber materials (alloys, cement, rubber and glass linings)
- Full range of reagent and by-product experience
- Broad experience in upgrading existing WFGDs
Our wet FGD systems have been effectively controlling emissions from coal-fired boilers and industrial processes for decades. This vast experience enables our engineers to custom design new systems and evaluate, rebuild/upgrade current systems to provide solutions to the most stringent environmental regulations.
- WFGDs provide excellent capture of SO2, acid gases, mercury, heavy metals, and PM
- Ideal for applications with high inlet SO2 and high SO2 removal (>95%) requirements
- Wide application to coal, oil, biomass and solid waste in power and industrial boilers
- Forefront in ELG (Effluent Limitation Guidelines) research. Single source technology provider to meet ELG regulations
Applications
Coal or Oil fired boilers
Hazardous and municipal solid waste
Mining
Oil refineries
Cement Kilns
FUELS
Eastern High Sulfur Coal
Eastern Bituminous
Illinois Basin High Sulfur Bituminous
Powder River Basin (PRB) Coal
Blended Coal and Pet Coke
High Sulfur Fuel Oil
How it Works
- Absorber slurry is continuously pumped from the recycle tank to the spray headers.
- The flue gas and absorber slurry are contacted counter-currently (Gas flows upward, absorber slurry downward).
- Acid Gasses (SO2 / SO3 / HCl / HF / Hg 2+) are absorbed by the scrubbing liquor and fall into the recycle tank.
- Chemical reactions take place in recycle tank to form Calcium Sulfite / Calcium Sulfate (gypsum).
- Fresh reagent is continuously added to the recycle tank to maintain slurry alkalinity via pH control.
- Air is added to the recycle tank to promote favorable reaction of calcium sulfite to calcium sulfate (gypsum)
- The treated flue gas passes through multi-stage mist eliminator modules which trap entrained drops before the flue gas exits.
Special Features
Dual Flow Tray (DFT)
- DFTs dramatically improve absorber performance well beyond open tower designs
- Lower liquid to gas ratio
- Smaller footprint
- Optimized flue gas distribution
- Easier absorber maintenance
- Lower capital cost
- Multiple DFTs can be provided to improve performance on both new and existing WFGDs
Spray Headers
- Optimized arrangement for maximum spray coverage
- Single absorber entry
- Self-supporting
Absorber Recycle Tank
- Large recycle tank reduces scale, and produces large, easily dewatered gypsum by-product
Stebbins Lined Absorber option
- Improved corrosion resistance
- Allows high chloride operation and reduced FGD waste stream
Design Flexibility
- Only Supplier offering Open Tower, Dual Flow Tray (DFT), and multiple DFT’s
- DFT offer SO2 removal > 99%, Lower L/G ratio, smaller footprint, easy maintenance
- Experience with variety of reagents (Limestone, Lime, Sodium)
- Broad materials experience (Alloy (317 LMN, 2205, 6 Moly, C-276 clad), Concrete Tile Lined (Stebbins), Carbon Steel with Flakeglass Lining
Continued Support
- Start-up
- Inspections
- Rebuild/Upgrade
- R&D
- WFGD Users Group
Recent Projects
Miami Smelter
Location: Claypool, AZ, USA
Customer Freeport-McMoRan Miami Inc.:
Design: DFT Absorber
Reagent: Sodium Hydroxide
Start-Up Year: 2017 scheduled
Gas Treated: Copper Smelter Converter Aisle and Anode Furnace
Gas Flow: 1,519,650 ACFM
(2,581,900 m3/hr)
SO2 Removal: 98%
Longview Station WFGD Modifications
Location: Maidsville, WV, USA
Customer: Longview Power
Modification: Single to Double DFT Absorber
Reagent: Limestone
Plant Capacity: 750 MWe
Start-Up Year: 2015
Fuel: Eastern Bituminous Coal
Gas Flow: 2,168,118 ACFM
(3,683,656 m3/hr)
SO2 Removal: Up to 98.6%
PSNH Merrimack Station, Units 1-2
Location: Bow, NH, USA
Customer: Public Services of NH
Design: DFT Absorber
Reagent: Limestone
Plant Capacity: 457 MWe
Start-Up Year: 2012
Fuel: Bituminous Coal
Gas Flow: 1,628,000 ACFM
(2,767,600 m3/hr)
SO2 Removal: Up to 97%
HF, HCl Removal: Up to 99%
Hg Removal: Up to 86%
Dallman Station, Unit 33 WFGD Modifications
Location: Springfield, IL, USA
Customer: City of Springfield
Modification: Dual loop to DFT Absorber
Reagent: Limestone
Plant Capacity: 192 MWe
Start-Up Year: 2011
Fuel: Illinois Bituminous Coal
Gas Flow: 913,000 ACFM
(1,552,100 m3/hr)
SO2 Removal: Up to 98%
Talk with a technical specialist
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For spare parts inquires please email us directly at spareparts@woodplc.com, please include the part number and serial / job number with your inquiry.