LIME WFGD TECHNOLOGY

The Lime-based WFGD process is very similar to the limestone-based WFGD but utilizes lime or high magnesium lime to absorb the SO2. Lime systems can be designed to produce wall board-grade gypsum as a saleable product.

 

Commercially Proven

• Lime provides higher SO2 absorption capacity compared to limestone
• The highly alkaline reagent results in reduced Liquid-to-Gas (L/G) ratio and therefore reduced power consumption relative to limestone-based scrubbing
• The higher reactivity of lime requires less retention time, reducing size and cost of the reaction tank
• Lower L/G (lower power) than limestone WFGD
• Utilizes smaller tank size due to requiring less reaction tank retention time
• Site specific economic factors may favor lime over limestone WFGD

 

Benefits of Lime WFGD

• Fifteen+ years of commercial operation at Allegheny Power, Harrison Units 1, 2 and 3
• Twenty+ years of commercial operation at Allegheny Power, Mitchell Unit 3
• Eighteen+ years of commercial operation at Utah Power and Light (now PacifiCorp Energy), Hunter 1 and 2.
• Current MET contract for Minnkota Power Cooperative, Milton R. Yount, Unit 1