Energy Balance of Turbocharged Engines Operating in a WWTP with Thermal Hydrolysis. Co-Digestion Provides the Full Plant Energy Demand
Autor: | Richard J.H. Smith, José García-Cascallana, Daniela Carrillo-Peña, Xiomar Gómez, Antonio Morán |
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Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Thermal efficiency
Technology QH301-705.5 QC1-999 Energy balance global efficiency engine cooling circuit Biogas General Materials Science Biology (General) Instrumentation QD1-999 Fluid Flow and Transfer Processes Waste management Process Chemistry and Technology Physics General Engineering biogas valorization Thermal hydrolysis electricity self-consumption Engineering (General). Civil engineering (General) Computer Science Applications Chemistry Electricity generation Engine efficiency heat recovery Environmental science Electric power TA1-2040 Electrical efficiency |
Zdroj: | Applied Sciences, Vol 11, Iss 11103, p 11103 (2021) Applied Sciences; Volume 11; Issue 23; Pages: 11103 |
ISSN: | 2076-3417 |
Popis: | The energy balance of lean-burn turbocharged engines using biogas as fuel is reported. Digestion data were obtained from the wastewater treatment plant (WWTP) of the city of Burgos (Spain), operating with a thermal hydrolysis unit for sludge pre-treatment. Operational performance of the plant was studied by considering the treatment of sludge as a comparative base for analyzing global plant performance if co-digestion is implemented for increasing biogas production. The calculation methodology was based on equations derived from the engine efficiency parameters provided by the manufacturer. Results from real data engine performance when evaluated in isolation as a unique control volume, reported an electrical efficiency of 38.2% and a thermal efficiency of 49.8% leading to a global efficiency of 88% at the operating point. The gross electrical power generated amounted to 1039 kW, which translates into 9102 MWh/year, with an economic value of 837,384 €/year which was completely consumed at the plant. It also represents 55.1% of self-consumption regarding the total electricity demand of the plant. The analysis of the system considering the use of the total installed capacity by adding a co-substrate, such as cheese whey or microalgae, reveals that total electrical self-consumption is attained when the co-substrate is directly fed into the digester (cheese whey case), obtaining 16,517 MWh/year equivalent to 1,519,160 €/year. The application of thermal hydrolysis as pre-treatment to the co-substrate (microalgae case study) leads to lower electricity production, but still attains a better performance than a mono-digestion baseline scenario. |
Databáze: | OpenAIRE |
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