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Silver Bay Biomass Binary Power Co‐generation Findings (continued) While there are some regional examples of conventional district heat and co‐generation fired with wood based biomass (St. Paul District Energy consumes about 50 ton/hour, Laurentian Energy of Virginia and Hibbing consumes 36 tph), smaller communities and institutions have not had the opportunity to utilize the locally abundant wood resource as a fuel for district heating and co‐generation. Brescia, Italy based Turboden and Groβgmain, Austria based V.A.S., both represented regionally by GPM of Duluth, are now ready to deliver their biomass binary (Organic Rankine Cycle, ORC) systems for district heating co‐generation in the US. In ORC biomass applications, heat is transferred in the efficient and low emission V.A.S. “Dutch Oven” style combustor to thermal oil followed by the thermal oil heat being transferred to a compressed, low boiling point, high molecular weight organic fluid, e.g., pentane, propane, octamethyltrisiloxane (OMTS, commonly found in cosmetics, suntan lotion and deodorants). The heated organic fluid expands through a turbine producing electricity and is condensed. Turbo expander condenser heat is rejected to either air or water systems. Water systems can be used to generate hot water for building or process heating. Turboden’s standard units range from 300 to 2500 kWe (kilo watt electrical) with other custom sizes available. Based on Higher Heating Value (HHV), fuel to electricity conversion ratio is about 14.5%. When used in a co‐ generation application, about 60.5% of the fuel is converted to relatively high grade (175°F) district heating water, suitable for building heating, Domestic Hot Water (DHW) service or absorption chilling for air conditioning. During the summer, condensing power and a lower return water temperature can increase the electric conversion ratio to over 16.5%. A biomass ORC system also fits extremely well with wood pellet manufacturing. The ORC unit supplies hot water for drying the chipped pellet feedstock while generating a net excess of about 500 kW of electricity. About 10 mmBtu/hr of District Heat could be available for the rest of the SBEIP, allowing for multiple process energy businesses as well as condominiums, apartments, etc. It might be possible to develop a relationship with an electric utility that has interest in using the ORC plant to meet their Renewable Portfolio Standard. It would be possible to purchase coal based electricity while allowing the entire generation of the ORC to be sold as a renewable. 9PDF Image | Biomass Binary Power Co-generation
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