Abstract
Biomass as a source of renewable energy is a promising solution for current problems in energy supply. Olive waste is considered as an interesting option, especially for Mediterranean countries. Within this paper, a microscale externally fired gas turbine (EFGT) technology is presented as a decentralized power plant, within the range of 15 kWth, based on olive residues. It was modeled by Aspen Plus 8.6 software to provide a sufficient technical study for such a plant. Optimized parameters for pressure ratio and turbine air-mass flow have been mapped for several loads to provide information for process control. For all cases, mechanical output, efficiency curves, and back-work ratio have been calculated. Using this information, typical plant sizes and an example of power production are discussed. Additionally, achievable energy production from olive waste is estimated on the basis of this data. The results of this study show that such a plant has an electrical efficiency of 5%–17%. This variation is due to the examination being performed under several combustion temperatures, actual load, heat exchanger temperatures, and heat transfer efficiency. A cost estimation of the discussed system showed an estimated capital cost of 33,800 to 65,300 € for a 15 kWth system.
Highlights
Using biomass as an energy source is considered to be one of the main options to supply renewable power and heat, reducing carbon dioxide emissions as well as consumption of imported fuels.Especially, the use of agricultural residues and other wastes from food industry is a good option to provide bioenergy with low additional carbon dioxide emissions
externally fired gas turbine (EFGT) cycle suggested in order illustrate idea by of the since theConsidering moving parts theth turbine) areis separated from theto flue gas the stream heat decentralized exchanger. power generation from olive waste for the modeling part
In comparison to the reference case with nominal operation conditions, the behavior of the cycle with variating pressures, temperatures, and mass flow parameters is evaluated
Summary
Using biomass as an energy source is considered to be one of the main options to supply renewable power and heat, reducing carbon dioxide emissions as well as consumption of imported fuels. The use of agricultural residues and other wastes from food industry is a good option to provide bioenergy with low additional carbon dioxide emissions. From several types of biomass, we chose olive residues for this research due to the abundant availability in Mediterranean countries. Olive-processing residues are considered as a promising source of biomass due to the energy utilization property shown based on its characteristics [2]. For 2015/2016, the worldwide production is 2,742,500 tons, produced mainly by Mediterranean countries (approximately 97%) [3,4]. Olive oil-extracting technologies are mainly traditional pressing and the centrifugation method with either
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