Exergo-Ecological Assessment of Waste to Energy Plants Supported by Solar Energy

Mendecka, Barbara; Lombardi, Lidia; Gładysz, Paweł; Stanek, Wojciech

doi:10.3390/en11040773

Cited by 20 publications

(5 citation statements)

References 39 publications

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“…The overall system was simulated by varying the superheated steam parameters (pressure and temperature). In a very preliminary evaluation (Mendecka et al 2018) a parametric analysis varying both pressure and temperature of the steam superheated in the solar section was carried out. In this work, we assume three different steam parameters values (couples of pressure and temperature), for the integrated system, representative of the previously investigated ranges, which are: 51 bar and 440 °C; 60 bar and 480 °C and 70 bar and 520 °C.…”

Section: Methodsmentioning

confidence: 99%

Waste to energy efficiency improvements: Integration with solar thermal energy

2019

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Hybridisation of waste to energy with solar facility can take competing energy technologies and make them complementary. However, realising the benefits of solar integration requires careful consideration of the technical feasibility as well as the economic and environmental benefits of a proposed system. In this work, a solar-integrated waste-to-energy plant scheme is proposed and analysed from an energy, environmental and economic point of view. The new system integrates a traditional waste-to-energy plant with a concentrated solar power plant, by superheating the steam produced by the waste-to-energy flue gas boiler in the solar facility. The original waste-to-energy plant – that is, the base case before introducing the integration with concentrated solar power – has a thermal power input of 50 MW and operates with superheated steam at 40 bar and 400 °C; net power output is 10.7 MW, and the net energy efficiency is equal to 21.65%. By combining waste-to-energy plant with the solar facility, the power plant could provide higher net efficiency (from 1.4 to 3.7 p.p. higher), lower specific CO2 emissions (from 69 to 180 kg MWh-1 lower) and lower levellised cost of electricity (from 13.4 to 42.3 EUR MWh-1 lower) comparing with the standalone waste to energy case. The study shows that: (i) in the integrated case and for the increasing steam parameters energy, economic and ecological performances are improved; (ii) increasing the solar contribution could be an efficient way to improve the process and system performances. In general, we can conclude that concentrated solar-power technology holds significant promise for extending and developing the waste to energy systems.

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Section: Methodsmentioning

confidence: 99%

Waste to energy efficiency improvements: Integration with solar thermal energy

2019

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“…Bianchi et al [29] investigated the WTE systems coupled with gas combined cycles, and results demonstrated that the hybrid system could obtain higher net power efficiency and economic benefits than the separate system. A combination of a WTE plant and solar energy facilities was studied, using solar energy to attain external superheating and achieving a 4.5% net efficiency enhancement [30]. Chen et al [31] combined a WTEU and a CFPU, upgrading total power efficiency and getting economic profits.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of a Waste-to-Energy System Integrated with the Steam–Water Cycle and Urea Hydrolysis Process of a Coal-Fired Power Unit

et al. 2022

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An innovative hybrid energy system consisting of a waste-to-energy unit and a coal-fired power unit is designed to enhance the energy recovery of waste and decrease the investment costs of waste-to-energy unit. In this integrated design, partial cold reheat steam of the coal-fired unit is heated by the waste-to-energy boiler’s superheater. The heat required for partial preheated air of waste-to-energy unit and its feedwater are supplied by the feedwater of CFPU. In addition, an additional evaporator is deployed in the waste-to-energy boiler, of which the outlet stream is utilized to provide the heat source for the urea hydrolysis unit of coal-fired power plant. The stand-alone and proposed designs are analyzed and compared through thermodynamic and economic methods. Results indicate that the net total energy efficiency increases from 41.84% to 42.12%, and the net total exergy efficiency rises from 41.19% to 41.46% after system integration. Moreover, the energy efficiency and exergy efficiency of waste-to-energy system are enhanced by 10.48% and 9.92%, respectively. The dynamic payback period of new waste-to-energy system is cut down from 11.39 years to 5.48 years, and an additional net present value of $14.42 million is got than before.

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“…Concerning system integration, Consonni et al [25] and Poma et al [26] discussed a hybrid WtE-gas turbine combined cycle scheme, where the steam yielded from the WtE boiler is further heated by the gas turbine exhaust gas and then enters into the steam turbine for power production. Mendecka et al [27] presented a novel WtE design incorporated with a concentrating solar power system, in which the solar energy is harvested to superheat the live steam of the WtE boiler. Chen et al [28] explored the integration of a WtE plant and a coal-fired power plant by feeding the heat acquired from the incineration into the steam cycle of the coal power section.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic and Economic Analyses of a New Waste-to-Energy System Incorporated with a Biomass-Fired Power Plant

Pan

Zhang

et al. 2020

Energies

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A novel design has been developed to improve the waste-to-energy process through the integration with a biomass-fired power plant. In the proposed scheme, the superheated steam generated by the waste-to-energy boiler is fed into the low-pressure turbine of the biomass power section for power production. Besides, the feedwater from the biomass power section is utilized to warm the combustion air of the waste-to-energy boiler, and the feedwater of the waste-to-energy boiler is offered by the biomass power section. Based on a 35-MW biomass-fired power plant and a 500-t/d waste-to-energy plant, the integrated design was thermodynamically and economically assessed. The results indicate that the net power generated from waste can be enhanced by 0.66 MW due to the proposed solution, and the waste-to-electricity efficiency increases from 20.49% to 22.12%. Moreover, the net present value of the waste-to-energy section is raised by 5.02 million USD, and the dynamic payback period is cut down by 2.81 years. Energy and exergy analyses were conducted to reveal the inherent mechanism of performance enhancement. Besides, a sensitivity investigation was undertaken to examine the performance of the new design under various conditions. The insights gained from this study may be of assistance to the advancement of waste-to-energy technology.

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Exergo-Ecological Assessment of Waste to Energy Plants Supported by Solar Energy

Cited by 20 publications

References 39 publications

Waste to energy efficiency improvements: Integration with solar thermal energy

Waste to energy efficiency improvements: Integration with solar thermal energy

Performance Analysis of a Waste-to-Energy System Integrated with the Steam–Water Cycle and Urea Hydrolysis Process of a Coal-Fired Power Unit

Thermodynamic and Economic Analyses of a New Waste-to-Energy System Incorporated with a Biomass-Fired Power Plant

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