Energy Balance of Turbocharged Engines Operating in a WWTP with Thermal Hydrolysis. Co-Digestion Provides the Full Plant Energy Demand
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 st...
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MDPI AG
2021-11-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/23/11103 |
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| author | José García-Cascallana Daniela Carrillo-Peña Antonio Morán Richard Smith Xiomar Gómez |
| author_facet | José García-Cascallana Daniela Carrillo-Peña Antonio Morán Richard Smith Xiomar Gómez |
| author_sort | José García-Cascallana |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T04:58:39Z |
| format | Article |
| id | doaj.art-e42a4ccab482462e95965ed4c1737f08 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T04:58:39Z |
| publishDate | 2021-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-e42a4ccab482462e95965ed4c1737f082023-11-23T02:02:33ZengMDPI AGApplied Sciences2076-34172021-11-0111231110310.3390/app112311103Energy Balance of Turbocharged Engines Operating in a WWTP with Thermal Hydrolysis. Co-Digestion Provides the Full Plant Energy DemandJosé García-Cascallana0Daniela Carrillo-Peña1Antonio Morán2Richard Smith3Xiomar Gómez4Area of Chemical Engineering, Department of Applied Chemistry and Physics, University of León, Campus de Vegazana, 24071 León, SpainChemical and Environmental Bioprocess Engineering Group, Natural Resources Institute (IRENA), University of León, Avenida de Portugal 41, 24009 León, SpainChemical and Environmental Bioprocess Engineering Group, Natural Resources Institute (IRENA), University of León, Avenida de Portugal 41, 24009 León, SpainDepartment of Chemical and Environmental Engineering, University of Nottingham, Coates Building B12, Nottingham NG7 2RD, UKChemical and Environmental Bioprocess Engineering Group, Natural Resources Institute (IRENA), University of León, Avenida de Portugal 41, 24009 León, SpainThe 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.https://www.mdpi.com/2076-3417/11/23/11103biogas valorizationheat recoveryengine cooling circuitelectricity self-consumptionglobal efficiency |
| spellingShingle | José García-Cascallana Daniela Carrillo-Peña Antonio Morán Richard Smith Xiomar Gómez Energy Balance of Turbocharged Engines Operating in a WWTP with Thermal Hydrolysis. Co-Digestion Provides the Full Plant Energy Demand Applied Sciences biogas valorization heat recovery engine cooling circuit electricity self-consumption global efficiency |
| title | Energy Balance of Turbocharged Engines Operating in a WWTP with Thermal Hydrolysis. Co-Digestion Provides the Full Plant Energy Demand |
| title_full | Energy Balance of Turbocharged Engines Operating in a WWTP with Thermal Hydrolysis. Co-Digestion Provides the Full Plant Energy Demand |
| title_fullStr | Energy Balance of Turbocharged Engines Operating in a WWTP with Thermal Hydrolysis. Co-Digestion Provides the Full Plant Energy Demand |
| title_full_unstemmed | Energy Balance of Turbocharged Engines Operating in a WWTP with Thermal Hydrolysis. Co-Digestion Provides the Full Plant Energy Demand |
| title_short | Energy Balance of Turbocharged Engines Operating in a WWTP with Thermal Hydrolysis. Co-Digestion Provides the Full Plant Energy Demand |
| title_sort | energy balance of turbocharged engines operating in a wwtp with thermal hydrolysis co digestion provides the full plant energy demand |
| topic | biogas valorization heat recovery engine cooling circuit electricity self-consumption global efficiency |
| url | https://www.mdpi.com/2076-3417/11/23/11103 |
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