Cofiring Coal with Coal with Switchgrass Switchgrass: : Cofiring - - PowerPoint PPT Presentation
Cofiring Coal with Coal with Switchgrass Switchgrass: : Cofiring The Chariton Valley Biomass Project The Chariton Valley Biomass Project Prepared for: Public Policy Virginia, Biofuels Meeting Charlottesville, VA March 30, 2006 Presented
Prepared for:
Presented by:
ANTARES Group Incorporated ● www.antaresgroupinc.com Landover, MD Office: 301-731-1900 ; Harrisonburg, VA Office: 540-442-9848
– Alliant Energy / Mid-American – 726 MW, PRB Coal, 1982 startup – Twin furnace T-fired PC boiler – 2.5 to 5% heat input from switchgrass, 12.5 to 25 ton/ hr – Separate biomass injection, 2 - 4 ports
– 2000 hr continuous test burn on-going – Newly constructed facility completed – Long term test to investigate fouling, slagging, and corrosion impacts
– 3’ x 4’ x 8’ switchgrass bales – 2-step milling process to 1/ 8” minus
– Local rural income & environmental benefits – Hedge against carbon regs & portfolio standards
– Cost share between U.S. Dept. of Energy & Project Partners – Approx. $16 million from DOE through end of FY06 – Farm Bill considerations will be key to commercial viability
– Designed for 12.5 ton/ hour, 24 hr/ day – 25,000 tons of switchgrass for 2,000 hour continuous test burn accumulated from 4,000 acres over several years – Contains several innovative, first-of-a-kind pieces of equipment (which are working great) – 17.5 MW of BASELOAD Renewable Energy – Automated control & monitoring system – Would require 100,000 tons/ yr, from 25k to 75k acres initially – Concept based on operating Danish straw-fired plants
Feedstock Development Power Plant Testing Economics, Market Devel. Environmental Impacts 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 Emphasize Crop Establishment, Planning, Begin Harvest & Storage, Ag R&D, Outreach, Prepare for First Test Burn 2008 PROJECT START COMMERCIALIZATION Analyze Test Results, Modify Equipment Design, Economic Peer Review, Continue Harvest & Storage, Continue Ag R&D, Detailed Planning, Prepare for Interim Test Burn First Test Burn Interim Test Burn Acceptable Power Plant Impacts Ash Approval Economics Peer Review Air Permits Fuel Supply Contract Signed Acceptable Power Plant Impacts Analyze Test Results, Modify Equipment Design, Continue Harvest & Storage, Complete Ag R&D, Prepare for Long Term Test Burn, Outreach Analyze Test Results, Prepare for Commercial Operations, Outreach Long Term Test Burn Acceptable Power Plant Impacts NOTE: Dashed lines indicate GO / NO-GO Milestones Feedstock Development Power Plant Testing Economics, Market Devel. Environmental Impacts 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 Emphasize Crop Establishment, Planning, Begin Harvest & Storage, Ag R&D, Outreach, Prepare for First Test Burn 2008 PROJECT START COMMERCIALIZATION Analyze Test Results, Modify Equipment Design, Economic Peer Review, Continue Harvest & Storage, Continue Ag R&D, Detailed Planning, Prepare for Interim Test Burn First Test Burn Interim Test Burn Acceptable Power Plant Impacts Ash Approval Economics Peer Review Air Permits Fuel Supply Contract Signed Acceptable Power Plant Impacts Analyze Test Results, Modify Equipment Design, Continue Harvest & Storage, Complete Ag R&D, Prepare for Long Term Test Burn, Outreach Analyze Test Results, Prepare for Commercial Operations, Outreach Long Term Test Burn Acceptable Power Plant Impacts NOTE: Dashed lines indicate GO / NO-GO Milestones
Equipment Development
Bale Accumulator Bale Handling Biomass Processing Baler Development
Equipment Development
Bale Accumulator Bale Handling Biomass Processing Baler Development
Research / Reports
Crop Studies & Cost Soil Stability/Erosion/Carbon Air/Ash/Water Impacts Harvest Impacts on Wildlife
Outreach
Public Outreach Web Outreach Publications
Outreach
Public Outreach Web Outreach Publications
Processing Facility
August 2005 September 2005 November 2005 June 2005 August 2005 September 2005 November 2005 June 2005
Growing Season After Frost, Before Harvest During Harvest After Harvest
Hoop Building (Straw Storage) Straw Palace (Straw Storage) OGS Main Plant Building “Biosilo” (Straw Storage & Processing)
Replacing up to 5% of this . . . . with this . . . .
– Moisture, w eight, reject, de-string, debale, m etal rem oval, m ill, burn
and baghouse for dust control and filtering
reduce particle size
lines to boiler
Switchgrass blow lines transporting ground switchgrass into boiler house (left) and boiler (right).
Ground switchgrass and pressurized transport air into OGS boiler Ground switchgrass and pressurized transport air to OGS boiler
CHARITON VALLEY BIOMASS PROJECT Daily Switchgrass Processing Chart (Friday March 10, 2006)
400 600 800 1,000 1,200 1,400
0:00 2:00 4:00 6:00 8:00 10:00 12:00 14:00 16:00 18:00 20:00 22:00 0:00
Time Bale Weight (lbs)
12.0 18.0 24.0 30.0 36.0 42.0
Bale Moisture (%) and Feed Rate (ton/hr)
Bale Weight (lbs.) Ave Bale Moisture (%) Feed Rate (ton/hr)
– Prove technical viability / no unacceptable impacts at power plant – Currently operating under a limited-term fuel supply contract during test burn
– SO2 credits, Renewable Energy Credits, Carbon Credits
– Large impact on supply availability and economics
– Prove no large risk factors to power plant / boiler – Demonstrate attractive economics for suppliers and power company