The Experts below are selected from a list of 18156 Experts worldwide ranked by ideXlab platform
Sonia Alvarez - One of the best experts on this subject based on the ideXlab platform.
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catalytic combustion of vineyard pruning waste in a conical spouted bed combustor
Catalysis Today, 2017Co-Authors: Maria San J Jose, Sonia Alvarez, Raquel LopezAbstract:Abstract The feasibility of a conical spouted bed combustor for the thermal catalytic exploitation of vineyard pruning waste, under different operating conditions has been analyzed. Stable-flow regimes of vine shoot beds with a Pd catalyst were determined over a wide range of combustion conditions. With the aim of improving the combustion yield, thermal exploitation of vine shoots was performed in batch mode, in a conical spouted bed combustor at Temperatures ranging from 250 to 550 °C, with and without the Pd catalyst. The influence of the catalyst and Inlet Gas Temperature on the flue Gas concentration was analyzed. The experimental vine shoot combustion yield with the Pd catalyst at different Inlet Gas Temperatures were compared with those obtained without the catalyst. The high experimental combustion efficiency calculated from the flue Gases concentrations demonstrates the favorable performance of the conical spouted bed combustor for the catalytic combustion of vine shoots.
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bed pressure drop in a draft tube conical spouted bed for thermal treatment of wastes
Chemical Engineering & Technology, 2015Co-Authors: Maria San J Jose, Sonia AlvarezAbstract:An experimental study of operating bed pressure drop was performed in thermal treatment of coarse waste particles of different size, density, and sphericity in conical spouted beds by introducing a nonporous draft tube. The influence of introducing a nonporous draft tube as well as of operating conditions on bed pressure drop was determined. Bed pressure drop in conical spouted beds with a nonporous draft tube was found to be lower than that without any device, which allows for saving operating costs. The most important factor influencing the bed pressure drop was the stagnant bed height. The bed pressure drop was reduced when stagnant bed height, particle density, particle sphericity or Inlet Gas Temperature were decreased. Likewise, the bigger the particle diameter, the lower was the bed pressure drop.
Hassan Barzegaravval - One of the best experts on this subject based on the ideXlab platform.
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exergoenvironmental optimization of heat recovery steam generators in combined cycle power plant through energy and exergy analysis
Energy Conversion and Management, 2013Co-Authors: Abdolsaeid Ganjeh Kaviri, Mohammad Nazri Mohd Jaafar, Tholudin Mat Lazim, Hassan BarzegaravvalAbstract:Abstract Combined cycle power plants (CCPPs) are preferred technology for electricity generation due to less emission and high efficiency. These cycles are made of a Gas turbine, a steam turbine and Heat Recovery Steam Generator (HRSG). In the present research study, a combined cycle power plant with dual pressure and supplementary firing is selected. The optimum design procedure included designing objective function, exergy destruction per unit of Inlet Gas to the HRSG subject to a list of constraints. The design parameters (design variables) were drum pressure and pinch Temperature difference as well as steam mass flow of HRSG high and low pressure levels. The influence of HRSG Inlet Gas Temperature on the steam cycle efficiency is discussed. The result show increasing HRSG Inlet Gas Temperature until 650 °C leads to increase the thermal efficiency and exergy efficiency of the cycle and after that has less improvement and start to decrease them. And also from the exergy analysis of each part of HRSG, it is cleared that the HP-EV and 2st HP-SH have the most exergy destruction respectively. In other hand, effects of HRSG Inlet Gas Temperature on SI (sustainability index) and CO 2 emission are considered.
Maria San J Jose - One of the best experts on this subject based on the ideXlab platform.
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catalytic combustion of vineyard pruning waste in a conical spouted bed combustor
Catalysis Today, 2017Co-Authors: Maria San J Jose, Sonia Alvarez, Raquel LopezAbstract:Abstract The feasibility of a conical spouted bed combustor for the thermal catalytic exploitation of vineyard pruning waste, under different operating conditions has been analyzed. Stable-flow regimes of vine shoot beds with a Pd catalyst were determined over a wide range of combustion conditions. With the aim of improving the combustion yield, thermal exploitation of vine shoots was performed in batch mode, in a conical spouted bed combustor at Temperatures ranging from 250 to 550 °C, with and without the Pd catalyst. The influence of the catalyst and Inlet Gas Temperature on the flue Gas concentration was analyzed. The experimental vine shoot combustion yield with the Pd catalyst at different Inlet Gas Temperatures were compared with those obtained without the catalyst. The high experimental combustion efficiency calculated from the flue Gases concentrations demonstrates the favorable performance of the conical spouted bed combustor for the catalytic combustion of vine shoots.
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bed pressure drop in a draft tube conical spouted bed for thermal treatment of wastes
Chemical Engineering & Technology, 2015Co-Authors: Maria San J Jose, Sonia AlvarezAbstract:An experimental study of operating bed pressure drop was performed in thermal treatment of coarse waste particles of different size, density, and sphericity in conical spouted beds by introducing a nonporous draft tube. The influence of introducing a nonporous draft tube as well as of operating conditions on bed pressure drop was determined. Bed pressure drop in conical spouted beds with a nonporous draft tube was found to be lower than that without any device, which allows for saving operating costs. The most important factor influencing the bed pressure drop was the stagnant bed height. The bed pressure drop was reduced when stagnant bed height, particle density, particle sphericity or Inlet Gas Temperature were decreased. Likewise, the bigger the particle diameter, the lower was the bed pressure drop.
B Scrosati - One of the best experts on this subject based on the ideXlab platform.
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adaptive neuro fuzzy inference system and artificial neural network modeling of proton exchange membrane fuel cells based on nanocomposite and recast nafion membranes
International Journal of Energy Research, 2013Co-Authors: Mehdi Amirinejad, Naser Tavajohihasankiadeh, S S Madaeni, Maria Assunta Navarra, Ezzat Rafiee, B ScrosatiAbstract:SUMMARY In this study, a proton exchange membrane fuel cell (PEMFC) is modeled by multilayer perceptron neural network (MLPNN), RBF neural network (RBFNN), and adaptive neuro-fuzzy inference system (ANFIS). Experimental data are obtained on the basis of the fabricated membrane-electrode assembly (MEA) responses using prepared nanocomposite and recast Nafion membranes in the PEMFC. Four parameters including cell Temperature, Inlet Gas Temperature, current density, and inorganic additive percent are used as inputs, and the cell voltage is considered as the output. The results show that there is no considerable discrepancy between the RBFNN accuracy (R = 0.99554) and the MLPNN accuracy (R = 0.99609) for the performance prediction. The required time for developing the RBFNN model is significantly lower than the MLPNN model. A variety of ANFIS structure is explored to approximate the behavior of the system. The effect of cell and Inlet Gas Temperatures on the PEMFC performance is investigated by the ANFIS developed model. Predicted polarization and power–current behavior by the ANFIS for the MEA prepared by the recast Nafion and the nanocomposite membranes at the cell Temperatures 50 °C to110°C are in high agreement with the experimental data. Predicted data by the ANFIS show that because of the property of Cs2.5H0.5PW12O40 additive for retaining water, much higher current density and power density at the same voltage are achieved for the nanocomposite membrane compared with the recast Nafion membrane in the PEMFC. Copyright © 2011 John Wiley & Sons, Ltd.
Mu Pan - One of the best experts on this subject based on the ideXlab platform.
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evaluation of 5 kw proton exchange membrane fuel cell stack operated at 95 c under ambient pressure
Journal of Power Sources, 2013Co-Authors: Haining Zhang, Zhiping Luo, J Liu, Zhongmin Wan, Mu PanAbstract:Abstract Composite membranes containing ePTFE matrix and short side chain perfluoronated sulfonated ionomers are introduced as electrolytes for proton exchange membrane fuel cell applications. The output voltage at 800 mA cm−2 for single cell using composite membrane as electrolyte reaches 0.61 V at 95 °C under 40% relative humidity whereas it is only 0.41 V for cell assembled from pristine short side chain perfluoronated sulfonated membrane at the same condition. The performance of fuel cell stack using composite membrane as electrolyte in kilowatts ranges has been experimentally investigated at 95 °C under ambient pressure. With the increase in the Inlet Gas Temperature, the performance of the stack is enhanced. The non-monotonic behavior in instantaneous average voltage of single cells in the stack has been observed and the peak value is appeared at the stack Temperature of 90 °C. The observed water accumulation phenomena suggest that the decrease in stack performance above 90 °C is attributed to the lack of water in the system. The results observed in this study demonstrate that the composite membrane has the potential operating at 95 °C under reduced relative humidity to 40%, which is a suitable operating condition for fuel cell vehicle applications.