comparisons of h2s and siloxane removal technologies...
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Comparisons of H2S and Siloxane Removal Technologies
at the PNGC Coffin Butte Resource ProjectJeff Friesen, P.E. and Brad Jeffers, ESI
Steve King, Project Manager, PNGC Power
NW Regional SWANA SymposiumTroutdale, Oregon
April 30, 2015
• Engineering & Design– Gas Collection Systems– Biogas Cleanup – Biogas-to-Energy Facilities– High BTU Facilities
• Construction Management & Oversight• Facility Operations• Controls (SCADA) Integrator• Custom Products
Coffin Butte Resource Project
5.66 MW Landfill Gas-to-Energy Facility
Project Background
• Guttered valves• Detonation shutdowns
• Blower/treatment system corrosion
• Fuel train corrosion
Existing Blower/Pretreatment Systems
Blower/Pretreatment System • 2,100scfm capacity• Condensate knockout and aftercooler system Coalescing filters prior to engines
LFG Characteristics
• Current Flow: ~1,900 SCFM– 53% CH4, 40% CO2, 6-6.5% N2, 0.5% O2
• Sulfur Content: ~320ppmv H2S and other Compounds
• Siloxane Content: – 2014 Sample: ~16.5 mg/m³– 2012 Sample: ~35 mg/m³
Design Target
• 2,100 – 2,700 SCFM• Hydrogen Sulfide: <10ppmv• Siloxane: <10mg/m³
– Per CAT Recommendations
Important Considerations
Capital Cost Considerations– Pressure drop– Required ancillary equipment– Equipment footprint– Total installed cost
Operating Cost Considerations– Media cost/life– Waste stream disposal costs– O&M costs (not evaluated by ESI)
Technology Performance History
H2S Removal TechnologiesBulk Media (Non-Regenerative)
Bulk Media (Semi-Regenenerative)
Liquid Solvents/ Scavengers
Bio-Filtration
Chelated Iron (Iron Redox)
H2S Removal TechnologiesBulk Media (Non-Regenerative)
Bulk Media (Semi-Regenenerative)
Liquid Solvents/ Scavengers
Bio-Filtration
Chelated Iron (Iron Redox)
$$$$$ $$$$$
Surprise! Limited Capital Savings
Iron Sponge Sulfatreat
H2S Removal TechnologiesBulk Media (Non-Regenerative)
Bulk Media (Semi-Regenenerative)
Liquid Solvents/ Scavengers
Bio-Filtration
Chelated Iron (Iron Redox)
1. Extended Media Life
2. Competitive Capital Cost
H2S Removal TechnologiesBulk Media (Non-Regenerative)
Bulk Media (Semi-Regenenerative)
Liquid Solvents/ Scavengers
Bio-Filtration
Chelated Iron (Iron Redox)
H2S Removal TechnologiesBulk Media (Non-Regenerative)
Bulk Media (Semi-Regenenerative)
Liquid Solvents/ Scavengers
Bio-Filtration
Chelated Iron (Iron Redox)
Almont Emissions
1. Unproven on LFG2. Promising Capital Cost3. Implementation Concerns
H2S Removal TechnologiesBulk Media (Non-Regenerative)
Bulk Media (Semi-Regenenerative)
Liquid Solvents/ Scavengers
Bio-Filtration
Chelated Iron (Iron Redox)
H2S Removal TechnologiesBulk Media (Non-Regenerative)
Bulk Media (Semi-Regenenerative)
Liquid Solvents/ Scavengers
Bio-Filtration
Chelated Iron (Iron Redox) LO CAT®, SulFerox® Process
H2S Removal TechnologiesBulk Media (Non-Regenerative)
Bulk Media (Semi-Regenenerative)
Liquid Solvents/ Scavengers
Bio-Filtration
Chelated Iron (Iron Redox)
Complex System
Prohibitive Capital Cost
Results – H2S Removal
MV Tech. Iron Sponge1 (ESC)
AlmontEmission
SulfaTreat 1(ESC)
SulfaTreat 2(US)
ChelatedIron
Biological 1(B)
Biological 2(T)
NRGTek
$
Equipment Cost 7-Year OPEX Installation Cost
Results – H2S Removal
MV Tech. Iron Sponge AlmontEmission
SulfaTreat 1(ESC)
SulfaTreat 2(US)
ChelatedIron
Biological 1(B)
Biological 2(T)
NRGTek
$
Equipment Cost 7-Year OPEX Installation Cost
Siloxane Removal TechnologiesBulk Media (Non-Regenerative)
Regenerative
Liquid Solvents/ Scavengers
Siloxane Removal TechnologiesBulk Media (Non-Regenerative)
Regenerative
Liquid Solvents/ Scavengers
Activated Carbon
1.High Operational Cost 2.High Capital Cost
Silica Gel
Siloxane Removal TechnologiesBulk Media (Non-Regenerative)
Regenerative
Liquid Solvents/ Scavengers
Siloxane Removal TechnologiesBulk Media (Non-Regenerative)
Regenerative
Liquid Solvents/ Scavengers
Important Factors to Consider:1. Dehydration/Refrigeration
System2. Pressure Drop- Booster Blower
Siloxane Removal TechnologiesBulk Media (Non-Regenerative)
Regenerative
Liquid Solvents/ Scavengers
Multiple Providers
Siloxane Removal TechnologiesBulk Media (Non-Regenerative)
Regenerative
Liquid Solvents/ Scavengers
PPTEK System
Willexa System
Siloxane Removal TechnologiesBulk Media (Non-Regenerative)
Regenerative
Liquid Solvents/ Scavengers
NRGTek Process
Siloxane Removal TechnologiesBulk Media (Non-Regenerative)
Regenerative
Liquid Solvents/ Scavengers
NRGTek System
Results – Siloxane Removal
Venture GCE/AB Willexa PpTek Willexa SRS NRGTek Activated Carbon(US)
$
Base Equipment Cost Ancillary Equipment Cost 7-Year OPEX Installation Cost
Results – Siloxane Removal
Venture GCE/AB Willexa PpTek Willexa SRS NRGTek Activated Carbon(US)
$
Base Equipment Cost Ancillary Equipment Cost 7-Year OPEX Installation Cost
Results & Recommendations
H2S Removal Technology 7-Year Net Present ValueMV Technologies $1,410,000
Siloxane Removal TechnologyWillexa PpTek $1,334,000
Study Recommendations to PNGC
Results & Recommendations
H2S Removal Technology 7-Year Net Present ValueMV Technologies $1,410,000
Siloxane Removal TechnologyWillexa PpTek $1,846,000
Willexa SRS $1,672,000
Revised Recommendations to PNGC
Results & Recommendations
H2S Removal Technology 7-Year Net Present Value
Almont Emissions $794,000*Siloxane Removal Technology
NRGTek $1,307,000*Combined H2S/Siloxane Removal
TechnologyNRGTek $1,800,000????
Possible Pilot Projects/Experimental Technologies
*Potential Operational Concerns
Conclusions & Lessons Learned
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