Dra. Yolanda López - Profile on Academia.edu (original) (raw)
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Papers by Dra. Yolanda López
La metodología de enseñanza aprendizaje y su incidencia en el rendimiento académico de los estudiantes de las asignaturas de géneros periodísticos de la carrera de Periodismo de la Universidad de Las Américas, período marzo-agosto 2011
Factores asociados con un mayor riesgo de retinopatía del prematuro en recién nacidos prematuros atendidos en un hospital de tercer nivel
Boletin Medico Del Hospital Infantil De Mexico, Aug 1, 2012
Economical assessment of competitive enhanced limestones for CO2 capture cycles in power plants
Fuel Processing Technology, Jun 1, 2009
... cost is not observed. Simulations calculate the maximum price for enhanced sorbents to achiev... more ... cost is not observed. Simulations calculate the maximum price for enhanced sorbents to achieve a reduction in CO 2 removal cost under different process conditions (solid circulation and make-up flow). The present study may ...
Publicación de noticias sobre seguridad pública (violencia), en los diarios regiomontanos, de enero a agosto de 2010
Actas Iv Congreso Internacional Latina De Comunicacion Social Comunicacion Control Y Resistencias 2012 Isbn 84 15698 06 2, 2012
La educación ambiental en los principales medios de comunicación de Monterrey, Nuevo León
Chemical Engineering Journal, 2009
a b s t r a c t CO 2 capture system based on the carbonation/calcination loop, still in its infan... more a b s t r a c t CO 2 capture system based on the carbonation/calcination loop, still in its infancy, has gained rapid interest due to promising carbonator CO 2 capture efficiency, low sorbent cost and the fact that no flue gases desulphurization unit is needed before entering the system. The sum of these features results in a competitively low cost CO 2 capture system. There are different options to design the carbonation loop. In this work, a basic configuration that makes use of two interconnected circulating fluidized beds (carbonator and calciner) has been studied. Among the key variables that influence the performance of these systems, the carbonation conversion of the sorbent and the heat requirement at calciner are the most relevant. Both variables are mainly influenced by CaO/CO 2 ratio and make-up flow (purge) of solids. A purge is necessary in order to reduce the sorbent deactivation and to compensate the formation of CaSO 4 from the SO x content in the flue gas. Large CaO/CO 2 ratios improve the carbonation conversion but also increase the cost of the system due to a more intensive solid circulation. High make-up flow also improves the carbonation conversion and hence the CO 2 capture, but increases the heat demand at calciner and the fresh sorbent cost. The aim of this paper is to calculate the optimum make-up flow and CaO/CO 2 ratio in order to minimize the capture cost of the system. Independent variables are make-up flow of fresh CaCO 3 and CaO/CO 2 ratio. The constraint equations are experimental data on carbonation reaction, mass and energy balances, oxygen requirement and fuel composition.
La Bioética y el Trabajo Social. Una experiencia profesional, reflexiones
Salud E Intervencion En Lo Social 2008 Isbn 978 950 802 283 7 Pags 75 96, 2008
PALABRAS CLAVE: periodismo, competencias en periodismo, metodologías de enseñanza periodismo, ren... more PALABRAS CLAVE: periodismo, competencias en periodismo, metodologías de enseñanza periodismo, rendimiento académico periodismo.
Actas Iv Congreso Internacional Latina De Comunicacion Social Comunicacion Control Y Resistencias 2012 Isbn 84 15698 06 2, 2012
A sus 78 años de servicio, la UANL consideró necesario la creación de un órgano especializado que... more A sus 78 años de servicio, la UANL consideró necesario la creación de un órgano especializado que gestione los procesos de comunicación y relaciones públicas con el objeto de responder a este rubro, se desarrollo un estudio con un enfoque desde la perspectiva de la Teoría de Sistemas, cuyo Objetivo General es: Analizar el diseño estructural de la UANL, para gestionar los procesos formales de comunicación y relaciones públicas institucionales. Los 0bjetivos Específicos a considerar son:
Risk factors associated with retinopathy of prematurity in preterm infants treated at a tertiary level hospital
Boletin Medico Del Hospital Infantil De Mexico, Aug 1, 2012
Energy and exergy as pertaining to solid looping cycles
Energy Intensity Reduction of Ca-Looping CO2 Capture by Applying Mixing Loop Seals and Cyclonic Systems
International Journal of Chemical Reactor Engineering, 2015
ABSTRACT This work faces the challenge of cutting the specific energy demand in the CO
Integration of carbonate CO
La planeación comunitaria del manejo del territorio
El papel de las comunidades campesinas en la conservación de los bosques
Greenhouse Gases: Science and Technology, 2011
Cement plants and power plants are two of the most signifi cant sources of greenhouse gases emiss... more Cement plants and power plants are two of the most signifi cant sources of greenhouse gases emissions. Many CO 2 reduction options have been proposed in literature for both sectors. They are mainly focused on CO 2 capture in power plants, but, in the short-term, industrial processes are going to play an important role in achieving this objective.
Using the second law of thermodynamic to improve CO2 capture systems
Energy Procedia, 2011
Among the main challenges of Carbon Capture and Storage (CCS) technologies, the reduction of ener... more Among the main challenges of Carbon Capture and Storage (CCS) technologies, the reduction of energy penalties associated with the capture process and the integration of the new process in the design of a complex system - original power plant and capture facility - are major issues. Traditionally, the Second Law of Thermodynamics is an essential tool for process optimization through
Energy Procedia, 2011
High temperature looping cycles, such as carbonation-calcination cycles based on calcium sorbents... more High temperature looping cycles, such as carbonation-calcination cycles based on calcium sorbents or chemical looping combustion are being developed and play an essential role in CO 2 capture technologies. Among proposed configurations, outstanding schemes make use of a number of interconnected fluidized beds and may operate at bubbling or circulating regime. Fluidized bed behaviour is well-known since they are included in many industrial applications, such as power plants and chemical industries. However, there is a lack of knowledge about their operation when more than one fluidized bed are coupled in the same system. One promising configuration for Ca-based sorption looping systems relies on the use of two circulating beds as carbonator and calciner and two bubbling beds acting as loop-seal valves. Many theoretical and lab experimental studies point out the need of large solid circulation in the system to reach high carbonation efficiencies. The control of this flow in complex CFB looping systems, where also internal recirculation exists in the risers, becomes a difficult task and deserves further studies to characterize them. The challenge to solve, through experimental tests and mathematical modelling, is finding a comprehensive control method to operate two circulating beds in turbulent regime and two bubbling sealing devices. Experimental results supporting high carbonation efficiency or feasibility in scaling-up solid circulation rates and inventories are needed to make the system more reliable. A lab-scale cold flow facility has been designed based on Glicksman's scaling rules and constructed in order to conduct experimental tests. The mechanical design of the facility and the choice of solid material, fluidizing gas and operating conditions should be such as to ensure the circulation of solids between reactors and the presence of solids inventory in the carbonator which are necessary to achieve high capture efficiencies. Operation of the system has been tested for a long number of hours under very different conditions. Measurements of circulation rate, static pressure, voidage profiles and standpipe height of solids have been used to identify trends in the hydrodynamic behaviour of the whole system while varying gas velocities in the risers, loop-seals, inventories in the reactors or size distribution of the particles. The circulation rates attained in the cold flow plant are comparable, after scaling-up, to solid flows in the loop which lead to high enough carbonation efficiencies of the system.
La metodología de enseñanza aprendizaje y su incidencia en el rendimiento académico de los estudiantes de las asignaturas de géneros periodísticos de la carrera de Periodismo de la Universidad de Las Américas, período marzo-agosto 2011
Factores asociados con un mayor riesgo de retinopatía del prematuro en recién nacidos prematuros atendidos en un hospital de tercer nivel
Boletin Medico Del Hospital Infantil De Mexico, Aug 1, 2012
Economical assessment of competitive enhanced limestones for CO2 capture cycles in power plants
Fuel Processing Technology, Jun 1, 2009
... cost is not observed. Simulations calculate the maximum price for enhanced sorbents to achiev... more ... cost is not observed. Simulations calculate the maximum price for enhanced sorbents to achieve a reduction in CO 2 removal cost under different process conditions (solid circulation and make-up flow). The present study may ...
Publicación de noticias sobre seguridad pública (violencia), en los diarios regiomontanos, de enero a agosto de 2010
Actas Iv Congreso Internacional Latina De Comunicacion Social Comunicacion Control Y Resistencias 2012 Isbn 84 15698 06 2, 2012
La educación ambiental en los principales medios de comunicación de Monterrey, Nuevo León
Chemical Engineering Journal, 2009
a b s t r a c t CO 2 capture system based on the carbonation/calcination loop, still in its infan... more a b s t r a c t CO 2 capture system based on the carbonation/calcination loop, still in its infancy, has gained rapid interest due to promising carbonator CO 2 capture efficiency, low sorbent cost and the fact that no flue gases desulphurization unit is needed before entering the system. The sum of these features results in a competitively low cost CO 2 capture system. There are different options to design the carbonation loop. In this work, a basic configuration that makes use of two interconnected circulating fluidized beds (carbonator and calciner) has been studied. Among the key variables that influence the performance of these systems, the carbonation conversion of the sorbent and the heat requirement at calciner are the most relevant. Both variables are mainly influenced by CaO/CO 2 ratio and make-up flow (purge) of solids. A purge is necessary in order to reduce the sorbent deactivation and to compensate the formation of CaSO 4 from the SO x content in the flue gas. Large CaO/CO 2 ratios improve the carbonation conversion but also increase the cost of the system due to a more intensive solid circulation. High make-up flow also improves the carbonation conversion and hence the CO 2 capture, but increases the heat demand at calciner and the fresh sorbent cost. The aim of this paper is to calculate the optimum make-up flow and CaO/CO 2 ratio in order to minimize the capture cost of the system. Independent variables are make-up flow of fresh CaCO 3 and CaO/CO 2 ratio. The constraint equations are experimental data on carbonation reaction, mass and energy balances, oxygen requirement and fuel composition.
La Bioética y el Trabajo Social. Una experiencia profesional, reflexiones
Salud E Intervencion En Lo Social 2008 Isbn 978 950 802 283 7 Pags 75 96, 2008
PALABRAS CLAVE: periodismo, competencias en periodismo, metodologías de enseñanza periodismo, ren... more PALABRAS CLAVE: periodismo, competencias en periodismo, metodologías de enseñanza periodismo, rendimiento académico periodismo.
Actas Iv Congreso Internacional Latina De Comunicacion Social Comunicacion Control Y Resistencias 2012 Isbn 84 15698 06 2, 2012
A sus 78 años de servicio, la UANL consideró necesario la creación de un órgano especializado que... more A sus 78 años de servicio, la UANL consideró necesario la creación de un órgano especializado que gestione los procesos de comunicación y relaciones públicas con el objeto de responder a este rubro, se desarrollo un estudio con un enfoque desde la perspectiva de la Teoría de Sistemas, cuyo Objetivo General es: Analizar el diseño estructural de la UANL, para gestionar los procesos formales de comunicación y relaciones públicas institucionales. Los 0bjetivos Específicos a considerar son:
Risk factors associated with retinopathy of prematurity in preterm infants treated at a tertiary level hospital
Boletin Medico Del Hospital Infantil De Mexico, Aug 1, 2012
Energy and exergy as pertaining to solid looping cycles
Energy Intensity Reduction of Ca-Looping CO2 Capture by Applying Mixing Loop Seals and Cyclonic Systems
International Journal of Chemical Reactor Engineering, 2015
ABSTRACT This work faces the challenge of cutting the specific energy demand in the CO
Integration of carbonate CO
La planeación comunitaria del manejo del territorio
El papel de las comunidades campesinas en la conservación de los bosques
Greenhouse Gases: Science and Technology, 2011
Cement plants and power plants are two of the most signifi cant sources of greenhouse gases emiss... more Cement plants and power plants are two of the most signifi cant sources of greenhouse gases emissions. Many CO 2 reduction options have been proposed in literature for both sectors. They are mainly focused on CO 2 capture in power plants, but, in the short-term, industrial processes are going to play an important role in achieving this objective.
Using the second law of thermodynamic to improve CO2 capture systems
Energy Procedia, 2011
Among the main challenges of Carbon Capture and Storage (CCS) technologies, the reduction of ener... more Among the main challenges of Carbon Capture and Storage (CCS) technologies, the reduction of energy penalties associated with the capture process and the integration of the new process in the design of a complex system - original power plant and capture facility - are major issues. Traditionally, the Second Law of Thermodynamics is an essential tool for process optimization through
Energy Procedia, 2011
High temperature looping cycles, such as carbonation-calcination cycles based on calcium sorbents... more High temperature looping cycles, such as carbonation-calcination cycles based on calcium sorbents or chemical looping combustion are being developed and play an essential role in CO 2 capture technologies. Among proposed configurations, outstanding schemes make use of a number of interconnected fluidized beds and may operate at bubbling or circulating regime. Fluidized bed behaviour is well-known since they are included in many industrial applications, such as power plants and chemical industries. However, there is a lack of knowledge about their operation when more than one fluidized bed are coupled in the same system. One promising configuration for Ca-based sorption looping systems relies on the use of two circulating beds as carbonator and calciner and two bubbling beds acting as loop-seal valves. Many theoretical and lab experimental studies point out the need of large solid circulation in the system to reach high carbonation efficiencies. The control of this flow in complex CFB looping systems, where also internal recirculation exists in the risers, becomes a difficult task and deserves further studies to characterize them. The challenge to solve, through experimental tests and mathematical modelling, is finding a comprehensive control method to operate two circulating beds in turbulent regime and two bubbling sealing devices. Experimental results supporting high carbonation efficiency or feasibility in scaling-up solid circulation rates and inventories are needed to make the system more reliable. A lab-scale cold flow facility has been designed based on Glicksman's scaling rules and constructed in order to conduct experimental tests. The mechanical design of the facility and the choice of solid material, fluidizing gas and operating conditions should be such as to ensure the circulation of solids between reactors and the presence of solids inventory in the carbonator which are necessary to achieve high capture efficiencies. Operation of the system has been tested for a long number of hours under very different conditions. Measurements of circulation rate, static pressure, voidage profiles and standpipe height of solids have been used to identify trends in the hydrodynamic behaviour of the whole system while varying gas velocities in the risers, loop-seals, inventories in the reactors or size distribution of the particles. The circulation rates attained in the cold flow plant are comparable, after scaling-up, to solid flows in the loop which lead to high enough carbonation efficiencies of the system.