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Figure 8: Layout of biomass digestion plant waste heat recovery Source: Applied Thermal Engineering 2009 11 According to Figure 8, extracted biogas from Biomass (2) is combusted in engines (1). Compressed air from turbo generator (3) and cooling water heat is utilized to heat the digester. Oil will be used to extract heat from flue gas of combustion (9) which will give heat to ORC fluid (10‐12). The ORC fluid can be heated or even super heated normally in a single heat exchanger which is well known as evaporator (11‐12). An implement cost evaluation on added ORC system shows that for a typical 500KW biomass digestion plant, additional 35KW electricity can be produces by an extra investment of 4800$/kW. Assuming more than 7500 hours of full operation, 15 years of life for system and interest rate of about 5%, it will yield 0.074 $/kWh electricity which is quiet lower than normal biomass based electricity price of about 0.17 $/kWh.11 11 A. Schuster, S. Karellas, E. Kakaras, H. Spliethoff. Energetic and economic investigation of Organic Rankine Cycle applications. Applied Thermal Engineering 2009; 29: 1811. 18PDF Image | Exergy
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