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Start Over Author "Dincer, I." Publisher elsevier b.v.
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48. A renewable energy based waste-to-energy system with hydrogen options.

Author

Gungor, B. and Dincer, I.

Subjects
*BIOMASS gasification, *RENEWABLE energy sources, *WASTE products as fuel, *GEOTHERMAL resources, *FUEL cells, *WIND power, *WASTE recycling
Abstract

A pressurized gasification combined system is studied in a novel integration with geothermal energy to produce hydrogen-enriched syngas. This system utilizes dewatered sludge, which leaves the biological wastewater treatment facility during the wastewater treatment process and is used as a feedstock to produce hydrogen as a useful output. The hydrogen produced is transformed in a proton-exchange fuel cell to electricity for community use. This system also incorporates a wind farm with a hydrogen storage system to meet societies' energy need when the energy demand fluctuates. The integrated system is then analyzed with thermodynamic-based energy and exergy approaches. The Greater Toronto area is chosen as the case study location and comprehensive thermodynamic analysis and simulation are completed on the Aspen Plus and Engineering Equation Solver softwares while the annual wind speed data are obtained from the RETScreen software. The daily total energy delivered to the community from this proposed system is recorded to be 2.1 GWh. In addition, the hydrogen production ratio at the gasification system is observed to be 0.12 through the sludge utilization where the energy and exergy efficiencies of the integrated gasification combined cycle were calculated to be 24% and 28%, in this order. The highest energy and exergy efficiency with 38.6% and 42.2%, respectively, are observed in January where the wind farm operated at a capacity of 41.7% and the average wind speed was 6.3 m/s for Greater Toronto Area. The overall energy and exergy efficiencies of this waste-to-energy system are calculated as 32.7% and 36.6%, respectively. • The highest volumetric hydrogen rate at the outlet of gasifier was seen to be 62.4% where the steam feed rate was 5 kg/s. • The hydrogen to dewatered sludge ratio was found to be 0.078 and 0.12 at the gasifier and water-gas shift reactor. • The highest energy and exergy efficiency with 38.6% and 42.2%, were observed in January when the wind speed was 6.3 m/s. • The daily energy delivered to the community was found to be 2.1 GWh through waste energy recovery and waste utilization. [ABSTRACT FROM AUTHOR]

Published
2022
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