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Optimization of product characteristics of porous carbon agglomerates using a design of experiments in fluidized bed agglomeration

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Particuology 2024年第6期89卷 258-269页

作者： martin Oelofse robert rack Marcelle Hilden Peter Langguth Department of Pharmaceutical Technology and Biopharmaceutics Johannes Gutenberg UniversityMainzGermany Carbon Advanced Solutions gmbh HeuchelheimGermany

Spraying parameters during particle agglomeration processes can affect the agglomeration kinetics and particle *** study was conducted to better understand the influence of the spraying parameters in a fluidized bed wet agglomeration process,and the influence on the stability characteristics of carbon tablets.A formulation based on fine carbon and peroxide powder,as well as carboxymethyl cellulose as a binder,was used to produce agglomerates in a first production *** in a second production step carbon tablets with a high porosity were molded for the customer goods *** optimization of the compressive strength of these carbon tablets was the goal of the *** agglomerates were produced with a laboratory scale granulator called“ProCell”and were compressed with a five-cavity mechanical *** screening of the agglomeration process parameters and their influence on the agglomerates quality,as well as the performance characteristics of the carbon tablets,were investigated using a multilevel factorial *** experimental runs were done by varying atomized air pressure and feed rate of the *** was determined by the design *** findings of the statistical trials showed that low atomized air pressure and a low feed rate lead to a higher tablet compressive strength.

关键词： Wet agglomeration fluidized bed Design of experiments Carbon agglomerates and tablets

Wear dependent virtual flow rate sensor for progressing cavity pumps with deformable stator

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Petroleum Science 2024年第2期21卷 1346-1353页

作者： Jens Müller Sebastian Leonow Johannes Schulz Christian Hansen martin Monnigmann ruhr-Universitat Bochum Universit atsstraûe 150Bochum44801Germany SEEPEX gmbh Scharnh olzstraûe 344Bottrop46240Germany

This contribution presents a novel wear dependent virtual flow rate sensor for single stage single lobe progressing cavity pumps. We study the wear-induced material loss of the pump components and the impact of this material loss on the volumetric efficiency. The results are combined with an established backflow model to implement a backflow calculation procedure that is adaptive to wear. We use a laboratory test setup with a highly abrasive fluid and operate a pump from new to worn condition to validate our approach. The obtained measurement data show that the presented virtual sensor is capable of calculating the flow rate of a pump being subject to wear during its regular operation.

关键词： Backflow Progressing cavity pump Virtual sensor Wear

CO_(2)capture costs of chemical looping combustion of biomass:A comparison of natural and synthetic oxygen carrier

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Journal of Energy Chemistry 2024年第5期92卷 296-310页

作者： Benjamin fleiß Juraj Priscak martin Hammerschmid Josef fuchs Stefan Müller Hermann Hofbauer Institute of Chemical Environmental and Bioscience EngineeringTU WienVienna1060 ViennaAustria BEST–Bioenergy and Sustainable Technologies gmbh Graz8010 StyriaAustria

Chemical looping combustion has the potential to be an efficient and low-cost technology capable of contributing to the reduction of the atmospheric concentration of CO_(2) in order to reach the 1.5/2°C goal and mitigate climate *** this process,a metal oxide is used as oxygen carrier in a dual fluidized bed to generate clean CO_(2) via combustion of *** commonly,natural ores or synthetic materials are used as oxygen carrier whereas both must meet special requirements for the conversion of solid *** oxygen carriers are characterized by higher reactivity at the expense of higher costs versus the lower-cost natural *** determine the viability of both possibilities,a techno-economic comparison of a synthetic material based on manganese,iron,and copper to the natural ore ilmenite was *** synthetic oxygen carrier was characterized and tested in a pilot plant,where high combustion efficiencies up to 98.4%and carbon capture rates up to 98.5%were *** techno-economic assessment resulted in CO_(2) capture costs of 75 and 40€/tCO_(2) for the synthetic and natural ore route respectively,whereas a sensitivity analysis showed the high impact of production costs and attrition rates of the synthetic *** synthetic oxygen carrier could break even with the natural ore in case of lower production costs and attrition rates,which could be reached by adapting the production process and recycling *** comparison to state-of-the-art technologies,it is demonstrated that both routes are viable and the capture cost of CO_(2) could be reduced by implementing the chemical looping combustion technology.

关键词： Chemical looping combustion BECCS Techno-economic assessment CO_(2)capture costs Oxygen carrier development Synthetic materials Ilmenite

recycled graphite for more sustainable lithium-ion batteries

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Carbon Energy 2024年第5期6卷 15-24页

作者： Mayokun Olutogun Anna Vanderbruggen Christoph frey martin rudolph Dominic Bresser Stefano Passerini Helmholtz Institute Ulm(HIU) Ulm Germany Karlsruhe Institute of Technology(KIT) KarlsruheGermany Helmholtz Zentrum Dresden-rossendorf(HZDr) Helmholtz Institute Freiberg for Resource Technology(HIF)FreibergGermany ProGraphite gmbh UntergriesbachGermany Chemistry Department Sapienza University of RomeRomeItaly

The demand for lithium-ion batteries(LIBs)is driven largely by their use in electric vehicles,which is projected to increase dramatically in the *** great success,however,urgently calls for the efficient recycling of LIBs at the end of their ***,we describe a froth flotation-based process to recycle graphite—the predominant active material for the negative electrode—from spent LIBs and investigate its reuse in newly assembled *** has been found that the structure and morphology of the recycled graphite are essentially unchanged compared to pristine commercial anode-grade graphite,and despite some minor impurities from the recycling process,the recycled graphite provides a remarkable reversible specific capacity of more than 350 mAh g^(−1).Even more importantly,newly assembled graphite‖NMC532 cells show excellent cycling stability with a capacity retention of 80%after 1000 cycles,that is,comparable to the performance of reference full cells comprising pristine commercial graphite.

关键词： anode graphite lithium-ion battery recycling sustainability

Coupling sensor observation services and web processing services for online geoprocessing in water dam monitoring

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International Journal of Digital Earth 2018年第1期11卷 64-78页

作者： C.Stasch B.Pross B.Gräler C.Malewski C.förster S.Jirka 52°North gmbh Martin-Luther-King-WegMünsterGermany Wupperverband Untere LichtenplatzerWuppertalGermany

Novel sensor technologies are rapidly *** enable a monitoring and modelling of our environment in a level of detail that was not possible a few years ***,while the raw data produced by these sensors are useful to get a first overview,it usually needs to be post-processed and integrated with other data or models in different *** this paper,we present an approach for integrating several geoprocessing components in the TaMIS water dam monitoring system developed with the Wupperverband,a regional waterbody authority in *** approach relies upon the OGC Web Processing Service and is tightly coupled with Sensor Observation Service instances running at the *** implementing the standardized XML-based interface,lightweight rEST APIs have been developed to ease the integration with thin Web clients and other Web-based *** this standards-based approach,new processing facilities can be easily integrated and coupled with different observation data sources.

关键词： Geoprocessing sensor web spatial data infrastructure water monitoring dam monitoring

Connector theory for reusing model results to determine materials properties

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npj Computational Materials 2022年第1期8卷 923-930页

作者： Marco Vanzini Ayoub Aouina martin Panholzer Matteo Gatti Lucia reining LSI CNRSCEA/DRF/IRAMISÉcole PolytechniqueInstitut Polytechnique de ParisF-91120PalaiseauFrance Theory and Simulation of Materials(THEOS) École Polytechnique Fédérale de LausanneCH-1015LausanneSwitzerland European Theoretical Spectroscopy facility(ETSf)https://www.etsf.eu Johannes Kepler University Linz LinzAustria Uni Software Plus gmbh Linzer Strasse 64320PergAustria Synchrotron SOLEIL L’Orme des MerisiersSaint-AubinBP 48F-91192Gif-sur-YvetteFrance

The success of Density functional Theory(DfT)is partly due to that of simple approximations,such as the Local Density Approximation(LDA),which uses results of a model,the homogeneous electron gas,to simulate exchange-correlation effects in real *** turn this intuitive approximation into a general and in principle exact theory by introducing the concept of a connector:a prescription how to use results of a model system in order to simulate a given quantity in a real *** this framework,the LDA can be understood as one particular approximation for a connector that is designed to link the exchange-correlation potentials in the real material to that of the *** the in principle exact connector equations allows us to go beyond the LDA in a systematic ***,connector theory is not bound to DfT,and it suggests approximations also for other functionals and other *** explain why this very general approach is indeed a convenient starting point for *** illustrate our purposes with simple but pertinent examples.

关键词： materials theory exact

Enabling Canonical Analysis Workflows Documented Data Harmonization on Global AirQuality Data

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Data Intelligence 2022年第2期4卷 259-270页

作者： Sabine Schroder Eleonora Epp Amirpasha Mozaffari Mathilde romberg Niklas Selke martin G.Schultz forschungszentrum Julich gmbh 52425 JulichGermany

Data harmonization and documentation of the data processing are essential prerequisites for enabling Canonical Analysis *** recently revised Terabyte-scale air quality database system,which the Tropospheric Ozone Assessment report(TOAr)created,contains one of the world's largest collections of near-surface air quality measurements and considers fAIr data principles as an integral part.A special feature of our data service is the on-demand processing and product generation of several air quality metrics directly from the underlying *** this paper,we show that the necessary data harmonization for establishing such online analysis services goes much deeper than the obvious issues of common data formats,variable names,and measurement units,and we explore how the generation of fAIr Digital Objects(fDO)in combination with automatically generateddocumentation may support Canonical Analysis Workflows for airquality and related data.

关键词： fAIr CWfr fDO Data Harmonization TOAr

Snap-shot topography measurement via dual-VCSEL and dual wavelength digital holographic interferometry

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Light(Advanced Manufacturing) 2021年第4期2卷 45-56页

作者： Daniel Claus Igor Alekseenko martin Grabherr Giancarlo Pedrini raimund Hibst Institut für Lasertechnologien in der Medizin und Meßtechnik Helmholzstraße 12UlmD-89081Germany Immanuel Kant Baltic federal University A.Nevsky str.14Kaliningrad236016Russia Priolas gmbh Kellerhalde 24Ulm 89081Germany Instiut für Technische Optik Universität StuttgartPfaffenwaldring 970195StuttgartGermany

In this paper,we propose a dual-wavelength digital holographic interferometry method based on a compact dual vertical-cavity surface-emitting laser(VCSEL)*** source simultaneously emits light from two highly stabilized coherent light sources with slightly different wavelengths.A highly stabilized and adjustable current source enables the application of digital holographic dual-wavelength techniques to measure the shape of an object with height steps of a few *** wavelength drift over 12 h over the entire measurement range,which was evaluated using a wavemeter,was smaller than 1 *** addition to the low measurement uncertainty at large height jumps,the dual-wavelength digital holographic system distinguishes itself by its robustness to environmental disturbances such as air turbulence,heat load,and/or mechanical *** is enabled via a fiber-based almost common-path single-shot digital holographic acquisition of the information of the two different wavelengths using angular *** experimental setup and data evaluation are discussed,and we present measurements of non-cooperative objects with specular reflective and/or diffuse reflective surfaces having different colors.

关键词： reflective millimeter holographic

Argon-seeded plasma exposure and oxidation performance of tungsten-chromium-yttrium smart alloys

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Tungsten 2019年第2期1卷 159-168页

作者： Janina Schmitz Andrey M.Litnovsky felix Klein Xiaoyue Tan Uwe Breuer Marcin rasinski Stephan Ertmer Arkadi Kreter Jesus Gonzalez-Julian martin Bram Jan Willem Coenen Christian Linsmeier forschungszentrum Juelich gmbh Institut fuer Energie-und Klimaforschung52425 JuelichGermany Department of Applied Physics Ghent University9000 GhentBelgium School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China forschungszentrum Juelich gmbh Institut fuer Engineering und Analytik52425 JuelichGermany

Tungsten-chromium-yttrium(WCrY)smart alloys are foreseen as the first wall material for future fusion devices such as Demonstration Power Plant(DEMO).While suppressing W oxidation during accidental conditions,they should behave like pure W during plasma operation due to preferential sputtering of the lighter alloying elements Cr,Y,and W enrichment of the *** this paper,the erosion performance of WCrY and W samples simultaneously exposed to deuterium(D)plasma with the addition of 1%of the projectile ions being argon(Ar)ions at an ion energy of 120 eV is *** reference to the previous experiments at 120 eV in pure D plasma,the erosion for both WCrY and W is enhanced by a factor of~*** Ar to the D plasma suppresses significant W enrichment previously found for pure D *** investigate the impact of the plasma exposure onto the oxidation performance,plasma-exposed and non-exposed reference samples were oxidised in a dry *** show,on the one hand,that the oxida-tion suppression of WCrY in comparison to pure W is preserved during the plasma *** the other hand,it becomes evident that edge effects imposed by the geometry of the samples used in plasma experiments play a significant role for the oxidation behaviour.

关键词： Tungsten-based alloys Plasma-facing material Smart alloys DEMO