Author: Xiaoyu Li
Publisher: Forschungszentrum Jülich
ISBN: 3893369163
Category :
Languages : en
Pages : 161
Book Description
Keine Angaben
Long Term Stability and Permeability of Mixed Ion Conducting Membranes under Oxyfuel Conditions
Author: Xiaoyu Li
Publisher: Forschungszentrum Jülich
ISBN: 3893369163
Category :
Languages : en
Pages : 161
Book Description
Keine Angaben
Publisher: Forschungszentrum Jülich
ISBN: 3893369163
Category :
Languages : en
Pages : 161
Book Description
Keine Angaben
Material Migration in Tokamak Plasmas with a Three-dimensional Boundary
Author: Ruth Laengner
Publisher: Forschungszentrum Jülich
ISBN: 3893369244
Category :
Languages : en
Pages : 175
Book Description
Publisher: Forschungszentrum Jülich
ISBN: 3893369244
Category :
Languages : en
Pages : 175
Book Description
Aerosol processes in the Planetary Boundary Layer: High resolution Aerosol Mass Spectrometry on a Zeppelin NT Airship
Author: Florian Rubach
Publisher: Forschungszentrum Jülich
ISBN: 389336918X
Category :
Languages : en
Pages : 155
Book Description
Publisher: Forschungszentrum Jülich
ISBN: 389336918X
Category :
Languages : en
Pages : 155
Book Description
Airborne VOC measurements on board the Zeppelin NT during the PEGASOS campaigns in 2012 deploying the improved Fast-GC-MSD System
Author: Jäger, Julia
Publisher: Forschungszentrum Jülich
ISBN: 3893369368
Category :
Languages : en
Pages : 199
Book Description
Publisher: Forschungszentrum Jülich
ISBN: 3893369368
Category :
Languages : en
Pages : 199
Book Description
Effect of Composition, Microstructure and Component Thickness on the Oxidation Behaviour of Laves Phase Strengthened Interconnect Steel for Solid Oxide Fuel Cells (SOFC)
Author: Cristina Asensio Jimenez
Publisher: Forschungszentrum Jülich
ISBN: 389336935X
Category :
Languages : en
Pages : 227
Book Description
Publisher: Forschungszentrum Jülich
ISBN: 389336935X
Category :
Languages : en
Pages : 227
Book Description
Innovative SANEX process for trivalent actinides separation from PUREX raffinate
Author: Michał Sypuła
Publisher: Forschungszentrum Jülich
ISBN: 3893369279
Category :
Languages : en
Pages : 229
Book Description
Recycling of nuclear spent fuel and reduction of its radiotoxicity by separation of long-lived radionuclides would definitely help to close the nuclear fuel cycle ensuring sustainability of the nuclear energy. Partitioning of the main radiotoxicity contributors followed by their conversion into short-lived radioisotopes is known as partitioning and transmutation strategy. To ensure efficient transmutation of the separated elements (minor actinides) the content of lanthanides in the irradiation targets has to be minimised. This objective can be attained by solvent extraction using highly selective ligands that are able to separate these two groups of elements from each other. The objective of this study was to develop a novel process allowing co-separation of minor actinides and lanthanides from a high active acidic feed solution with subsequent actinide recovery using just one cycle, so-called innovative SANEX process. The conditions of each step of the process were optimised to ensure high actinide separation efficiency. Additionally, screening tests of several novel lipophilic and hydrophilic ligands provided by University of Twente were performed. These tests were aiming in better understanding the influence of the extractant structural modifications onto An(III)/Ln(III) selectivity and complexation properties. ...
Publisher: Forschungszentrum Jülich
ISBN: 3893369279
Category :
Languages : en
Pages : 229
Book Description
Recycling of nuclear spent fuel and reduction of its radiotoxicity by separation of long-lived radionuclides would definitely help to close the nuclear fuel cycle ensuring sustainability of the nuclear energy. Partitioning of the main radiotoxicity contributors followed by their conversion into short-lived radioisotopes is known as partitioning and transmutation strategy. To ensure efficient transmutation of the separated elements (minor actinides) the content of lanthanides in the irradiation targets has to be minimised. This objective can be attained by solvent extraction using highly selective ligands that are able to separate these two groups of elements from each other. The objective of this study was to develop a novel process allowing co-separation of minor actinides and lanthanides from a high active acidic feed solution with subsequent actinide recovery using just one cycle, so-called innovative SANEX process. The conditions of each step of the process were optimised to ensure high actinide separation efficiency. Additionally, screening tests of several novel lipophilic and hydrophilic ligands provided by University of Twente were performed. These tests were aiming in better understanding the influence of the extractant structural modifications onto An(III)/Ln(III) selectivity and complexation properties. ...
Institute of Energy and Climate Research IEK-6: Nuclear Waste Management Report 2011 / 2012
Author: M. Klinkenberg
Publisher: Forschungszentrum Jülich
ISBN: 3893369201
Category :
Languages : en
Pages : 205
Book Description
Publisher: Forschungszentrum Jülich
ISBN: 3893369201
Category :
Languages : en
Pages : 205
Book Description
Full-waveform inversion of surface ground penetrating radar data and coupled hydrogeophysical inversion for soil hydraulic property estimation
Author: Sebastian Busch
Publisher: Forschungszentrum Jülich
ISBN: 3893369309
Category :
Languages : en
Pages : 129
Book Description
Publisher: Forschungszentrum Jülich
ISBN: 3893369309
Category :
Languages : en
Pages : 129
Book Description
Experimental Study and Modeling Analysis of Ion Transport Membranes for Methane Partial Oxidation and Oxyfuel Combustion
Author: Georgios T. Dimitrakopoulos
Publisher:
ISBN:
Category :
Languages : en
Pages : 223
Book Description
The atmospheric concentration of CO 2 has recently exceeded 400 (ppm) (up from 285 (ppm) in 1850), largely because of the burning of fossil fuels. Despite the growth of alternatives, these fuels will continue to play a major role in the energy sector for many decades. In accordance with international agreements, action to curtail C02 emissions is necessary, including carbon capture, reuse and storage. For this purpose, some of the leading technologies are oxy-combustion for power generation and partial oxidation for syngas production. Both require significant quantities of oxygen, whose production can impose considerable energy and economic penalties. Alternative technologies, such as intermediate-temperature ceramic membranes, operating under reactive conditions, promise to ameliorate both. Challenges include the long term stability of the material, reactor design and integration into the overall system. The goal of this thesis is to develop a framework for the thermochemical and electrochemical modeling of oxygen-conducting membranes that can be used in reactor design, based on experimental measurements and detailed surface exchange kinetics and charged species transport. La0. 9Ca0.1Fe03-[delta] (LCF) perovskite membranes have been used because of their long term stability in a reducing environment. Using experimental measurements, we examine the impact of hydrogen, carbon monoxide and methane on oxygen permeation and defect chemistry. While LCF exhibits low flux under non-reactive conditions, in the presence of fuel oxygen permeation increases by more than one order of magnitude. Our experiments confirm that hydrogen surface oxidation is faster compared to carbon monoxide. With methane, syngas production is slow and oxygen permeation is limited by surface exchange on the permeate side. Adding C02 to the fuel stream doubles the oxygen flux and increases syngas production by an order of magnitude. Our modeling analysis shows that different oxidation states of Fe participate in the electron transfer process. To account for this dependency, oxygen transport is modeled using a multi-step (fuel dependent) surface reaction mechanism that preserves thermodynamic consistency and conserves site balance and electroneutrality. Charged species diffusion is modeled using the dilute-limit Poisson-Nernst-Planck formulation that accounts for transport due to concentration gradient as well as electromigration. We use the experimental data to extract kinetic parameters of the model. We couple the aforementioned model with CFD of the gas-phase transport and thermochemistry in an effort to develop a numerical tool that allows the design of membrane reactors that exhibit high oxygen permeation and fuel conversion.
Publisher:
ISBN:
Category :
Languages : en
Pages : 223
Book Description
The atmospheric concentration of CO 2 has recently exceeded 400 (ppm) (up from 285 (ppm) in 1850), largely because of the burning of fossil fuels. Despite the growth of alternatives, these fuels will continue to play a major role in the energy sector for many decades. In accordance with international agreements, action to curtail C02 emissions is necessary, including carbon capture, reuse and storage. For this purpose, some of the leading technologies are oxy-combustion for power generation and partial oxidation for syngas production. Both require significant quantities of oxygen, whose production can impose considerable energy and economic penalties. Alternative technologies, such as intermediate-temperature ceramic membranes, operating under reactive conditions, promise to ameliorate both. Challenges include the long term stability of the material, reactor design and integration into the overall system. The goal of this thesis is to develop a framework for the thermochemical and electrochemical modeling of oxygen-conducting membranes that can be used in reactor design, based on experimental measurements and detailed surface exchange kinetics and charged species transport. La0. 9Ca0.1Fe03-[delta] (LCF) perovskite membranes have been used because of their long term stability in a reducing environment. Using experimental measurements, we examine the impact of hydrogen, carbon monoxide and methane on oxygen permeation and defect chemistry. While LCF exhibits low flux under non-reactive conditions, in the presence of fuel oxygen permeation increases by more than one order of magnitude. Our experiments confirm that hydrogen surface oxidation is faster compared to carbon monoxide. With methane, syngas production is slow and oxygen permeation is limited by surface exchange on the permeate side. Adding C02 to the fuel stream doubles the oxygen flux and increases syngas production by an order of magnitude. Our modeling analysis shows that different oxidation states of Fe participate in the electron transfer process. To account for this dependency, oxygen transport is modeled using a multi-step (fuel dependent) surface reaction mechanism that preserves thermodynamic consistency and conserves site balance and electroneutrality. Charged species diffusion is modeled using the dilute-limit Poisson-Nernst-Planck formulation that accounts for transport due to concentration gradient as well as electromigration. We use the experimental data to extract kinetic parameters of the model. We couple the aforementioned model with CFD of the gas-phase transport and thermochemistry in an effort to develop a numerical tool that allows the design of membrane reactors that exhibit high oxygen permeation and fuel conversion.
Proceedings of the ASME Heat Transfer Division
Author:
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages : 820
Book Description
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages : 820
Book Description