| 1. |
- Petrov, Miroslav P., et al.
(författare)
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Solar augmentation of conventional steam plants : From system studies to reality
- 2012
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Ingår i: World Renewable Energy Forum, WREF 2012, Including World Renewable Energy Congress XII and Colorado Renewable Energy Society (CRES) Annual Conference. - : American Solar Energy Society. - 9781622760923 ; , s. 2682-2689
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Konferensbidrag (refereegranskat)abstract
- Solar energy is often available in abundant quantities in the vicinity of conventional steam power plants close to large energy-consumption centers, where also the need for clean add-on power is substantial. Fossil-fuel based power units (coal fired steam plants or natural gas fired combined cycles) can be augmented with solar thermal power for feedwater preheating or parallel steam generation. Especially relevant is if the solar field in such developments is designed to deliver lower temperatures when compared to solar-only steam units, therefore decreasing the costs for the solar hardware and its maintenance. Employing solar energy either for upgrade of existing large-scale utility plants or in new constructions avails also of their intrinsically high efficiency of energy conversion and established infrastructure. The potential benefits of solar-fossil hybrid steam cycles have already been widely recognized and various feasibility studies carried out. A more systematic approach for proper evaluation of efficiency gain is necessary, for several representative types and sizes of conventional utility steam plants. More straightforward optimization studies are also required for finding the optimum penetration of solar power in the fossil-fired steam cycle, taking into account both technological and economy values. The present work attempts to provide an exhaustive review of previous efforts in this field, summarize the potential for practical deployment, and primarily build up the basis for a normalized systematic approach upon which various broad optimization studies can be performed with the ultimate goal of examining the technical and economical feasibility of any solar-fossil integrated concept and ultimately proposing a viable practical application for any specific location.
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| 2. |
- Salomon Popa, Marianne, 1976-, et al.
(författare)
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Thermoeconomic evaluation of integration concepts for solar & biomass hybrid power plants
- 2013
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Ingår i: Proceedings of the ASME Power Conference 2013. - : ASME Press. - 9780791856062
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Konferensbidrag (refereegranskat)abstract
- Solar thermal energy and biomass fuels are often available at locations where they can benefit from combined hybrid energy utilization methods for the generation of electricity, representing suitable and advantageous integration alternatives. The feasibility of concentrating solar power (CSP) systems depends on cost limitations, desired installed power capacity and direct solar insolation, where smaller scales and low-cost solutions can often be preferred to large-scale investmentintensive installations. Biomass residues of various types, on the other hand, can be considered as proven fuels for small-to-midscale utility or industry based power or cogen arrangements and utilized through various technologies. The thermodynamic integration between a biomass fired power plant and a CSP unit can help to significantly increase the availability of the plant, improve its partial load characteristics, compensate for the intermittency of the solar energy resource while preserving the purely renewable profile of the generated electricity, and at the same time showing better overall performance when compared to two separate plants while avoiding the need for costly energy storage solutions. Biomass fuels can help reach better steam conditions in a steam plant based on CSP-generated steam, and thus improve the efficiency of energy conversion for the integrated hybrid system if compared with two individual single-fuel power units. In this study, an overview of feasible solar-biomass integration concepts is presented. A deeper thermoeconomic analysis of a selected integrated utility-scale biomass and CSP electricity generation plant is attempted, with certain simplifications. Furthermore, a multiobjective optimization strategy is regarded as very necessary and thus included in the analysis, where several major environmental aspects plus the cost of electricity are involved and defined in terms of desired parameters and conditions representative to Central Europe and Southeastern United States. The results are compared with conventional power generation alternatives. On that basis, a low-parameter CSP solution integrated with conventional biomass-fired combustion unit, where solar-generated steam is being superheated by the biomass fuel, has been chosen as the focus of the analysis in this study.
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| 3. |
- Udomsri, Seksan, et al.
(författare)
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Clean energy conversion from municipal solid waste and climate change mitigation in Thailand : Waste management and thermodynamic evaluation
- 2011
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Ingår i: Energy for Sustainable Development. - : Elsevier. - 0973-0826 .- 2352-4669. ; 15:4, s. 355-364
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Tidskriftsartikel (refereegranskat)abstract
- Enhanced energy security and renewable energy development are currently high on the public agenda in Southeast Asia, which features large populations and expansive economies. Biomass and Municipal Solid Waste (MSW) have widely been accepted as important locally-available renewable energy sources and represent one of the largest renewable energy sources worldwide. This article presents an evaluation of the potential of MSW incineration for climate change mitigation and promotion of biomass-based electricity production in a more sustainable direction in Thailand. The energy recovery potential of MSW is analyzed by investigating various types of incineration technologies. Both conventional technologies and more advanced hybrid dual-fuel cycles (which combine MSW and natural gas fuels) are considered in analyses covering cycle performance and CO(2) emissions. Results show that MSW incineration has the ability to lessen environmental impact associated with waste disposal, and it can contribute positively towards expanding biomass-based energy production in Thailand. Hybrid cycles can be proposed to improve system performance and overall electrical efficiency of conventional incineration. The hybrid cycle featuring parallel interconnection is somewhat more attractive in terms of efficiency improvement: electrical efficiency increases by 4% and CO(2) emission levels are reduced by 5-10% as compared to the reference incineration case. The reduction of greenhouse gas emissions is even more attractive when methane gas emitted fro m existing landfill sites is to be compared.
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