Cogeneration Facility The University of North Carolina at Chapel Hill Cogeneration Systems Energy Services Department Tim Aucoin- Regulatory Compliance Coordinator

Overview Purpose History Features Future

Hospital Research Steam for the University Purpose Hospital Research Steam for the University

Renovated in 1992, this building bears the name of Joshua W. Gore,                                                                                                     Joshua Walker Gore (1852-1908) and Gore Building Cogeneration facility Renovated in 1992, this building bears the name of Joshua W. Gore, a science and engineering professor at Carolina.

1978

2005

4/26/2017

District Energy = E3 Energy Economics Environment

UNC-CH District Energy

Campus Steam Distribution

Underground Steam Tunnel

Cogeneration or CHP ( Combined Heat and Power ) Simultaneous production of electricity and steam High thermal efficiency Low environmental impact

U.S. Average Generating Efficiencies 100% 80% UNC Cogen • 60% 40% 20% 0%

UNC-CH Cogeneration Air Boilers Coal Water Steam Turbine Generator 150 psi 40 psi Heating Cooling Hot Water Sterilization Cooking/Dishwashing Electricity Condenser

Generator Dispatch

Circulating Fluidized Bed Boiler

Circulating Fluidized Bed Combustion Clean coal technology Nitrogen Oxides (NOx) -- furnace temperature Sulfur dioxide (SO2) -- sorbent

Climate Action Plan UNC was an early adopter of the American College and University Presidents Climate Commitment Pledged climate neutrality by 2050 Climate Action Plan adopted by University in September 2009 Alternative Energy Study, looked at alternatives to coal, began 2 years before Climate Action Plan issued

Biomass Issues Fuel supply chain and cost Front end fuel handling 4/26/2017 Biomass Issues Fuel supply chain and cost Front end fuel handling Storage Feed systems Impact on combustion and heat transfer surface Baghouse impacts Ash disposal impacts

Biomass Plan Test protocols – February 2010 Dried wood pellets tests – Spring 2010 Torrified wood tests – Fall to Winter 2010/2011 Evaluation and implementation plan development – 2010/2011 Burn 2012 – Dependent upon fuel supply reliability and extent of required modifications

Prologue to the Future: UNC Climate Action Plan and Cogen Climate Action Plan Published September 2009 Two Cogen Projects over next 5 years: Landfill Gas to Energy Biomass Co-firing at Cogen