The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Carlos Rodrigues Pereira Belchior - One of the best experts on this subject based on the ideXlab platform.
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Thermodynamic Simulation model for predicting the performance of spark ignition engines using biogas as fuel
Energy Conversion and Management, 2017Co-Authors: Mario Nunes M De Faria, Juan Vargas Machuca P Bueno, Sami Massalami Mohammed Elmassalami Ayad, Carlos Rodrigues Pereira BelchiorAbstract:Abstract Biogas found its way from developing countries and is now an alternative to fossil fuels in internal combustion engines and with the advantage of lower greenhouse gas emissions. However, its use in gas engines requires engine modifications or adaptations that may be costly. This paper reports the results of experimental performance and emissions tests of an engine-generator unit fueled with biogas produced in a sewage plant in Brazil, operating under different loads, and with suitable engine modifications. These emissions and performance results were in agreement with the literature and it was confirmed that the penalties to engine performance were more significant than emission reduction in the operating range tested. Furthermore, a zero dimensional Simulation model was employed to predict performance characteristics. Moreover, a differential Thermodynamic equation system was solved, obtaining the pressure inside the cylinder as a function of the crank angle for different engine conditions. Mean effective pressure and indicated power were also obtained. The results of Simulation and experimental tests of the engine in similar conditions were compared and the model validated. Although several simplifying assumptions were adopted and empirical correlations were used for Wiebe function, the model was adequate in predicting engine performance as the relative difference between simulated and experimental values was lower than 5%. The model can be adapted for use with different raw or enriched biogas compositions and could prove to be a valuable tool to guide experimentation, reducing time and resources needed. As such, it is suitable for use with biogas supplies in developing regions, such as Brazil, for small-scale power generation in rural areas.
Majid Amidpour - One of the best experts on this subject based on the ideXlab platform.
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Scenario analysis of gasification process application in electrical energy-freshwater generation from heavy fuel oil, Thermodynamic, economic and environmental assessment
International Journal of Hydrogen Energy, 2015Co-Authors: Mousa Meratizaman, Sina Monadizadeh, Hamed Akbarpour, Armin Ebrahimi, Majid AmidpourAbstract:Today heavy fuel oil is still produced and plays an important role in providing required energy. However, there could be environmental problems as a result of burning these utilized fuel oils. Also, the heavy fuel oil cannot be used in high efficiency power plants same as combined cycle because of physical characteristics. Partial oxidation (Gasification) process is introduced as a solution to reduce the emission production in the power generation cycle from heavy fuel oil. In this process, the heavy fuel oil is converted into the syngas (mainly consist of CO and H2). The chemical energy content of syngas can be converted into the electrical energy with high efficiency and low emission production through high efficient cycle like combined cycle and Solid oxide fuel cell-gas turbine. To improve the efficiency of high temperature power generation system, a thermal desalination unit is coupled with them during the scenario analysis. Thermodynamic Simulation, economic and environmental assessment are performed to investigate the feasibility of introduced power generation system. Results show that the suggested scenarios are not economic in the current condition. Applying the emission penalty cost and producing the more valuable product same as freshwater can improve the system feasibility.
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multi objective thermoeconomic optimization of coupling msf desalination with pwr nuclear power plant through evolutionary algorithms
Desalination, 2009Co-Authors: M Khoshgoftar H Manesh, Majid AmidpourAbstract:Abstract This paper deals with the application of an evolutionary algorithm to multi-objective thermoeconomic optimization of coupling a multi stage flash desalination (MSF) plant with a pressurized water reactor (PWR) nuclear power plant. The Thermodynamic Simulation of this initial PWR plant has been performed in a Thermoflex simulator. An Excel add-in called Thermoflex Link has been developed to calculate the exergy of each stream from Thermoflex Simulation results. Meanwhile, a computer code has been developed for thermoeconomic and improved combined pinch–exergy analysis in Matlab environment. Both the design configuration (feed water heater structure) and the process variables are optimized simultaneously. The optimization algorithm can choose among several design options included in a superstructure of the feed water heater in dual purpose plant. For the assumptions and simplifications made in this study, a 3000 MW (thermal) PWR power plant such as the Bushehr power plant has been considered. A detailed exergy and exergoeconomic analysis of selected final optimal design identifies the magnitude, location and causes of the Thermodynamic inefficiencies. Improved combined pinch and exergy analysis has been applied to display the system information graphically for one to visualize the performance of the system in the initial and final case.
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optimization of the coupling of pressurized water nuclear reactors and multistage flash desalination plant by evolutionary algorithms and thermoeconomic method
International Journal of Energy Research, 2009Co-Authors: M Khoshgoftar H Manesh, Majid Amidpour, M H HamediAbstract:Thermodynamic Simulation programs are widely used for designing complex thermal systems, but most of them do not incorporate second law optimization techniques. In this study, an efficient optimization strategy is presented, which integrates three optimization techniques with a professional power plant and a cogeneration simulator so as to perform exergoeconomic optimization of complex thermal systems and generate combined pinch and exergy representations. This paper deals with the application of an evolutionary algorithm based on NSGA-II to multi-objective thermoeconomic optimization of coupling desalination plant with pressurized water reactor (PWR). In addition, one-objective thermoeconomic optimization through genetic algorithm and mixed integer non-linear mathematical programming methods has been applied for evaluation of multi-objective optimization. The Thermodynamic Simulation of this plant has been performed in the THERMOFLEX simulator. An Excel Add-in called THERMOFLEX link has been developed to calculate the exergy of each stream from THERMOFLEX Simulation results. In addition, a computer code has been developed for thermoeconomic and improved combined pinch–exergy analysis in the MATLAB environment. Also, multi-objective and one-objective evolutionary algorithm optimization has been performed in MATLAB and one-objective mathematical programming has been performed in LINGO software. Both the design configuration and the process variables are optimized simultaneously. The optimization algorithm can choose among several design options included in a superstructure of the feed water heaters and multistage flash desalination in a dual-purpose plant. For the assumptions and simplifications made in this study, a 3000 MWh PWR power plant similar to Bushehr power plant has been considered. Copyright © 2008 John Wiley & Sons, Ltd.
Mario Nunes M De Faria - One of the best experts on this subject based on the ideXlab platform.
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Thermodynamic Simulation model for predicting the performance of spark ignition engines using biogas as fuel
Energy Conversion and Management, 2017Co-Authors: Mario Nunes M De Faria, Juan Vargas Machuca P Bueno, Sami Massalami Mohammed Elmassalami Ayad, Carlos Rodrigues Pereira BelchiorAbstract:Abstract Biogas found its way from developing countries and is now an alternative to fossil fuels in internal combustion engines and with the advantage of lower greenhouse gas emissions. However, its use in gas engines requires engine modifications or adaptations that may be costly. This paper reports the results of experimental performance and emissions tests of an engine-generator unit fueled with biogas produced in a sewage plant in Brazil, operating under different loads, and with suitable engine modifications. These emissions and performance results were in agreement with the literature and it was confirmed that the penalties to engine performance were more significant than emission reduction in the operating range tested. Furthermore, a zero dimensional Simulation model was employed to predict performance characteristics. Moreover, a differential Thermodynamic equation system was solved, obtaining the pressure inside the cylinder as a function of the crank angle for different engine conditions. Mean effective pressure and indicated power were also obtained. The results of Simulation and experimental tests of the engine in similar conditions were compared and the model validated. Although several simplifying assumptions were adopted and empirical correlations were used for Wiebe function, the model was adequate in predicting engine performance as the relative difference between simulated and experimental values was lower than 5%. The model can be adapted for use with different raw or enriched biogas compositions and could prove to be a valuable tool to guide experimentation, reducing time and resources needed. As such, it is suitable for use with biogas supplies in developing regions, such as Brazil, for small-scale power generation in rural areas.
Xiushan Yang - One of the best experts on this subject based on the ideXlab platform.
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a sustainable process to utilize ferrous sulfate waste from titanium oxide industry by reductive decomposition reaction with pyrite
Thermochimica Acta, 2015Co-Authors: Penghui Huang, Xiushan Yang, Zhiye Zhang, Xinlong Wang, Shaogang Deng, Xiaodong Chen, Lin YangAbstract:Abstract Ferrous sulfate waste has become a bottleneck in the sustainable development of the titanium dioxide industry in China. In this study, we propose a new method for the reductive decomposition of ferrous sulfate waste using pyrite. Thermodynamics analysis, tubular reactor experiments, and kinetics analysis were performed to analyze the reaction process. The results of the Thermodynamic Simulation showed that the reaction process and products were different when molar ratio of FeSO4/FeS2 was changed. The suitable molar ratio of FeSO4/FeS2 was 8–12. The reaction temperature of ferrous sulfate with pyrite was 580–770 K and the main products were Fe3O4 and SO2. The Simulation results agreed well with the experimental results. The desulphurization rate reached 98.55% and main solid products were Fe3O4 at 823.15 K when mole ratio of FeSO4/FeS2 was 8. Nano-sized magnetite was obtained at this condition. The kinetic model was investigated by isoconversional methods. The average E value was 244.34 kJ mol−1. The ferrous sulfate decomposition process can be treated as autocatalytic reaction mechanism, which corresponded to the expanded Prout–Tompson (Bna) model. The reaction mechanism of autocatalytic reactions during the process of ferrous sulfate decomposition were explored, the products of Fe oxide substances are the catalyst components.
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Thermodynamic study of phosphogypsum decomposition by sulfur
The Journal of Chemical Thermodynamics, 2013Co-Authors: Xiushan Yang, Zhiye Zhang, Xinlong Wang, Lin Yang, Benhe Zhong, Jingfeng LiuAbstract:Abstract Phosphogypsum (PG) is one of the most significant industrial solid wastes from the phosphorus chemical industry. In order to utilize PG more effectively, a new decomposition process of PG by sulfur as a reducer is proposed in this work. Thermodynamic study of the sulfur reduction process including two-step reactions was carried out by both Thermodynamic Simulation and experimental research. The Simulation results indicate that sulfur changes its form in a complex way with rising temperature. The final decomposition temperature of PG by Simulation is 993 K in the first-step reaction, and this is in good agreement with that obtained by the experiments. For the second-step reaction, however, the final PG decomposition temperature from the experiments is 250 K lower than the Simulation results predict. The reaction heat of the sulfur reduction process is 27.95% less than that of the traditional coke reduction process at T = 1473 K based on enthalpy change calculations. This new process can reduce the emission of CO 2 effectively and is more suitable for resource utilization of PG than the coke reduction process, so it may be a promising method for sulfuric acid production from PG.
Lin Yang - One of the best experts on this subject based on the ideXlab platform.
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a sustainable process to utilize ferrous sulfate waste from titanium oxide industry by reductive decomposition reaction with pyrite
Thermochimica Acta, 2015Co-Authors: Penghui Huang, Xiushan Yang, Zhiye Zhang, Xinlong Wang, Shaogang Deng, Xiaodong Chen, Lin YangAbstract:Abstract Ferrous sulfate waste has become a bottleneck in the sustainable development of the titanium dioxide industry in China. In this study, we propose a new method for the reductive decomposition of ferrous sulfate waste using pyrite. Thermodynamics analysis, tubular reactor experiments, and kinetics analysis were performed to analyze the reaction process. The results of the Thermodynamic Simulation showed that the reaction process and products were different when molar ratio of FeSO4/FeS2 was changed. The suitable molar ratio of FeSO4/FeS2 was 8–12. The reaction temperature of ferrous sulfate with pyrite was 580–770 K and the main products were Fe3O4 and SO2. The Simulation results agreed well with the experimental results. The desulphurization rate reached 98.55% and main solid products were Fe3O4 at 823.15 K when mole ratio of FeSO4/FeS2 was 8. Nano-sized magnetite was obtained at this condition. The kinetic model was investigated by isoconversional methods. The average E value was 244.34 kJ mol−1. The ferrous sulfate decomposition process can be treated as autocatalytic reaction mechanism, which corresponded to the expanded Prout–Tompson (Bna) model. The reaction mechanism of autocatalytic reactions during the process of ferrous sulfate decomposition were explored, the products of Fe oxide substances are the catalyst components.
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Thermodynamic study of phosphogypsum decomposition by sulfur
The Journal of Chemical Thermodynamics, 2013Co-Authors: Xiushan Yang, Zhiye Zhang, Xinlong Wang, Lin Yang, Benhe Zhong, Jingfeng LiuAbstract:Abstract Phosphogypsum (PG) is one of the most significant industrial solid wastes from the phosphorus chemical industry. In order to utilize PG more effectively, a new decomposition process of PG by sulfur as a reducer is proposed in this work. Thermodynamic study of the sulfur reduction process including two-step reactions was carried out by both Thermodynamic Simulation and experimental research. The Simulation results indicate that sulfur changes its form in a complex way with rising temperature. The final decomposition temperature of PG by Simulation is 993 K in the first-step reaction, and this is in good agreement with that obtained by the experiments. For the second-step reaction, however, the final PG decomposition temperature from the experiments is 250 K lower than the Simulation results predict. The reaction heat of the sulfur reduction process is 27.95% less than that of the traditional coke reduction process at T = 1473 K based on enthalpy change calculations. This new process can reduce the emission of CO 2 effectively and is more suitable for resource utilization of PG than the coke reduction process, so it may be a promising method for sulfuric acid production from PG.
