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Prof. Benito Navarrete
University of Seville (Spain)

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Research Keywords & Expertise

0 Emissions Control
0 Pilot Plant
0 CO2 capture & Utilization
0 combustion and fuel
0 Energy efficiency and energy savings

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Journal article
Published: 20 February 2021 in Journal of Environmental Chemical Engineering
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The oxy-combustion process is one of the alternatives which have been evaluated to counteract the increase in CO2 emissions over recent years. This technology consists of a combustion process with oxygen instead of air, which facilitates the capture of CO2 after the flue gas treatment process. Nowadays, oxy-combustion has not been implemented full-scale because of the high energy and economic requirements of the air separation unit to provide oxygen to the process. This paper proposes to ion transport membranes as a replacement for the air separation unit in order to minimize their high energy penalty of the overall system power. In particular, this work presents four processes based on the oxygen-fired plant with an oxygen transport membrane unit. As benchmark cases used to quantify the energy penalties for CO2 capture, the correspondent air combustion process without CO2 capture and a cryogenic oxygen-fired process (Case1) were considered. The thermodynamic comparison between the proposal alternatives has been conducted through simulation models based on Aspen Plus tools. The net electric power and the net efficiency of electricity production have been used as key parameters, which have allowed achieving an optimal system design that provides reduces the power consumption related to separate oxygen from the air. As the results show, the oxygen transport membranes concept exhibits better net electrical efficiency (35.7% vs. 30.6%), lower efficiency drop (2.5% vs. 7.6%) and lower specific captured CO2 (986 gCO2/hkWnet vs. 1140 gCO2/hkWnet) compared to the cryogenic oxygen-fired process.

ACS Style

E. Portillo; Luz M. Gallego Fernández; F. Vega; B. Alonso-Fariñas; B. Navarrete. Oxygen transport membrane unit applied to oxy-combustion coal power plants: A thermodynamic assessment. Journal of Environmental Chemical Engineering 2021, 9, 105266 .

AMA Style

E. Portillo, Luz M. Gallego Fernández, F. Vega, B. Alonso-Fariñas, B. Navarrete. Oxygen transport membrane unit applied to oxy-combustion coal power plants: A thermodynamic assessment. Journal of Environmental Chemical Engineering. 2021; 9 (4):105266.

Chicago/Turabian Style

E. Portillo; Luz M. Gallego Fernández; F. Vega; B. Alonso-Fariñas; B. Navarrete. 2021. "Oxygen transport membrane unit applied to oxy-combustion coal power plants: A thermodynamic assessment." Journal of Environmental Chemical Engineering 9, no. 4: 105266.

Journal article
Published: 02 December 2020 in Processes
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Herein, a novel method for energy recovery from molten synthetic slags is analyzed. In this work, the potential energy that could be recovered from the production of synthetic slag is estimated by means of an integrated experimental–theoretical study. The energy to be recovered comes from the cooling–solidification stage of the synthetic slag manufacturing. Traditionally, the solidification stage has been carried out through quick cooling with water, which does not allow the energy recovery. In this paper, a novel cooling method based on metal spheres is presented, which allows the energy recovery from the molten slags. Two points present novelty in this work: (1) the method for measuring the metal spheres temperature (2) and the estimation of the energy that could be recovered from these systems in slag manufacturing. The results forecasted that the temperature achieved by the metal spheres was in the range of 295–410 °C in the center and 302–482 °C on the surface. Furthermore, we estimated that 325–550 kJ/kg of molten material could be recovered, of which 15% of the energy consumption is in the synthetic slag manufacturing process. Overall, the results obtained confirmed the potential of our proposal for energy recovery from the cooling–solidification stage of synthetic slag manufacturing.

ACS Style

Francisco M. Baena-Moreno; Mónica Rodríguez-Galán; Benito Navarrete; Luis F. Vilches. Novel Study for Energy Recovery from the Cooling–Solidification Stage of Synthetic Slag Manufacturing: Estimation of the Potential Energy Recovery. Processes 2020, 8, 1590 .

AMA Style

Francisco M. Baena-Moreno, Mónica Rodríguez-Galán, Benito Navarrete, Luis F. Vilches. Novel Study for Energy Recovery from the Cooling–Solidification Stage of Synthetic Slag Manufacturing: Estimation of the Potential Energy Recovery. Processes. 2020; 8 (12):1590.

Chicago/Turabian Style

Francisco M. Baena-Moreno; Mónica Rodríguez-Galán; Benito Navarrete; Luis F. Vilches. 2020. "Novel Study for Energy Recovery from the Cooling–Solidification Stage of Synthetic Slag Manufacturing: Estimation of the Potential Energy Recovery." Processes 8, no. 12: 1590.

Review
Published: 17 June 2019 in Separation and Purification Technology
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Coal-fired power plants are considered to be one of the industrial technologies with a substantial contribution to climate change. In order to reduce their environmental impact, carbon capture and storage have acquired importance as a future clean coal technology in short and medium term. Concerning the closer-to-market options for CO2 capture, oxy-combustion is seen as one of the promising zero-emission plants due to the possibility of its suitability in existing boilers. This technology uses oxygen as the oxidant for combustion, providing a raw CO2 product which contains mainly water vapor, oxygen and nitrogen. Currently, cryogenic air separation is the only available mature option on a commercial scale. However, this system involves a high capital investment and an energy penalty in the oxy-fuel process, thus hindering its full-scale commercialization. As oxygen transport membranes offer significant advantages compared to the previous alternative, this option is foreseen as a candidate for its replacement. This work includes a review of this system and focuses on the study of the possible alternatives for integration into the oxy-fuel combustion process. As a result of this research, the compiled information has been homogenized, providing a completed base data related to operating parameters, required equipment and location of the combustion process for each studied alternative.

ACS Style

Esmeralda Portillo; Bernabé Alonso-Fariñas; Fernando Vega; Mercedes Cano; Benito Navarrete. Alternatives for oxygen-selective membrane systems and their integration into the oxy-fuel combustion process: A review. Separation and Purification Technology 2019, 229, 115708 .

AMA Style

Esmeralda Portillo, Bernabé Alonso-Fariñas, Fernando Vega, Mercedes Cano, Benito Navarrete. Alternatives for oxygen-selective membrane systems and their integration into the oxy-fuel combustion process: A review. Separation and Purification Technology. 2019; 229 ():115708.

Chicago/Turabian Style

Esmeralda Portillo; Bernabé Alonso-Fariñas; Fernando Vega; Mercedes Cano; Benito Navarrete. 2019. "Alternatives for oxygen-selective membrane systems and their integration into the oxy-fuel combustion process: A review." Separation and Purification Technology 229, no. : 115708.

Journal article
Published: 09 January 2019 in Materials
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Herein an innovative process to develop a potential vitreous material with cementing properties is proposed. This process paves a production path through melting industrial waste and subsequently cooling the casting in water. The idea erases the need to reduce the environmental impact of the cement industry in terms of natural resources consumption as well as the re-utilization of abandoned wastes from other industries. The recycled industrial wastes were selected according to the amount of waste produced in the industrial field and its suitable chemical composition, such as construction and demolition waste and/or shells from shellfish. As a main result, the mechanical properties showed by our novel material were worse than those reported by blast furnace slag (25–28 MPa for two different proportions) for seven days and better (43–52 MPa for two different proportions) for 28 days. The rest of the properties evaluated were in agreement with the standards’ requirements. Hence, this novel process would help to minimize the environmental impact of these wastes at the same time that their use in the cement industry would reduce the consumption of raw materials.

ACS Style

Mónica Rodríguez-Galán; Bernabé Alonso-Fariñas; Francisco M. Baena-Moreno; Carlos Leiva; Benito Navarrete; Luis F. Vilches. Synthetic Slag Production Method Based on a Solid Waste Mix Vitrification for the Manufacturing of Slag-Cement. Materials 2019, 12, 208 .

AMA Style

Mónica Rodríguez-Galán, Bernabé Alonso-Fariñas, Francisco M. Baena-Moreno, Carlos Leiva, Benito Navarrete, Luis F. Vilches. Synthetic Slag Production Method Based on a Solid Waste Mix Vitrification for the Manufacturing of Slag-Cement. Materials. 2019; 12 (2):208.

Chicago/Turabian Style

Mónica Rodríguez-Galán; Bernabé Alonso-Fariñas; Francisco M. Baena-Moreno; Carlos Leiva; Benito Navarrete; Luis F. Vilches. 2019. "Synthetic Slag Production Method Based on a Solid Waste Mix Vitrification for the Manufacturing of Slag-Cement." Materials 12, no. 2: 208.

Journal article
Published: 24 October 2018 in Processes
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This article presents a regeneration method of a sodium hydroxide (NaOH) solution from a biogas upgrading unit through calcium carbonate (CaCO3) precipitation as a valuable by-product, as an alternative to the elevated energy consumption employed via the physical regeneration process. The purpose of this work was to study the main parameters that may affect NaOH regeneration using an aqueous sodium carbonate (Na2CO3) solution and calcium hydroxide (Ca(OH)2) as reactive agent for regeneration and carbonate slurry production, in order to outperform the regeneration efficiencies reported in earlier works. Moreover, Raman spectroscopy and Scanning Electron Microscopy (SEM) were employed to characterize the solid obtained. The studied parameters were reaction time, reaction temperature, and molar ratio between Ca(OH)2 and Na2CO3. In addition, the influence of small quantities of NaOH at the beginning of the precipitation process was studied. The results indicate that regeneration efficiencies between 53%–97% can be obtained varying the main parameters mentioned above, and also both Raman spectroscopy and SEM images reveal the formation of a carbonate phase in the obtained solid. These results confirmed the technical feasibility of this biogas upgrading process through CaCO3 production.

ACS Style

Francisco M. Baena-Moreno; Mónica Rodríguez-Galán; Fernando Vega; T. R. Reina; Luis F. Vilches; Benito Navarrete. Regeneration of Sodium Hydroxide from a Biogas Upgrading Unit through the Synthesis of Precipitated Calcium Carbonate: An Experimental Influence Study of Reaction Parameters. Processes 2018, 6, 205 .

AMA Style

Francisco M. Baena-Moreno, Mónica Rodríguez-Galán, Fernando Vega, T. R. Reina, Luis F. Vilches, Benito Navarrete. Regeneration of Sodium Hydroxide from a Biogas Upgrading Unit through the Synthesis of Precipitated Calcium Carbonate: An Experimental Influence Study of Reaction Parameters. Processes. 2018; 6 (11):205.

Chicago/Turabian Style

Francisco M. Baena-Moreno; Mónica Rodríguez-Galán; Fernando Vega; T. R. Reina; Luis F. Vilches; Benito Navarrete. 2018. "Regeneration of Sodium Hydroxide from a Biogas Upgrading Unit through the Synthesis of Precipitated Calcium Carbonate: An Experimental Influence Study of Reaction Parameters." Processes 6, no. 11: 205.