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Pilot Test at Foster Wheeler Development Center
Florida Power Corporation’s Controlled Air Emissions (CAIRE™) technology (licensed to
ClearStack) is a two-stage gasifier-combustor based on molten slag bath coal gasification
technology. The 1st Stage is a small coal gasifier. Excess air is added to complete
combustion in the 2nd Stage as the fuel gas from the gasifier enters the furnace. Lime was
is added to capture sulfur in the molten slag that flows from the gasifier to a water quench.
FWDC 12 Million Btu/hr Pilot Gasifier
Test results:
- Sulfur Capture: 59 wt% using hydrated lime,
limestone yielded a high of 45%
- NOX Emissions: 0.25 to 0.38 lb/106 Btu
- Combustion Efficiency: 95.0 to 98.7 wt% carbon conversion
Lincoln, IL Demonstration Project
A 40 Million Btu/hr Ashworth Gasifier-Combustion System™ (AG-CS), a three stage
gasifier followed by two oxidation stages, was demonstrated at the Lincoln Developmental
Center in Lincoln, Illinois by ClearStack Combustion Corporation. The total project cost
was $3.5 million.
Test results:
- NOX emissions as low as 0.095 lb/106 Btu
- SO2 reduction of 72% at a Ca/S ratio of 0.85, using limestone and achieving 85%
calcium utilization
- 99 wt% carbon conversion
- CO emissions of 15 to 30 ppmvd @ 3% O2
- Hg capture in slag/fly ash of 93 to 100 wt% Leach tests of slag and fly ash yielded
0 mg Hg/L of leachate
- 80+% capture of Sb, As, Ba, Be, Cd, Cr, Co, Cu, Hg, Pb, Mo, Ni, Se, Ag, Tl, V, Zn and Mn with
slag and fly ash. Fly ash and slag leachate tests (TCLP) showed that Ag, As, Ba, Cd, Hg, Pb,
and Se were well below the EPA regulatory limit
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