TY - CHAP A1 - Findeisen, Alexander A1 - Rombrecht, Hans-Bernd A1 - Krautz, Hans Joachim T1 - Qualitätsanforderungen an alternative Biomasse-Brennstoffe Y1 - 2006 ER - TY - CHAP A1 - Findeisen, Alexander A1 - Krautz, Hans Joachim A1 - Hauke, Th. A1 - Kranzmann, A. T1 - Corrosion Processes and Carbonisation of Boiler Materials under Air and Oxyfuel Process Conditions Y1 - 2011 ER - TY - CHAP A1 - Findeisen, Alexander A1 - Krautz, Hans Joachim T1 - Untersuchungen zum Korrosionsverhalten ausgewählter Werkstoffe bei verschiedenen Betriebsbedingungen Y1 - 2009 ER - TY - GEN A1 - Findeisen, Alexander A1 - Klatt, Matthias A1 - Krautz, Hans Joachim T1 - Examination of the corrosion behaviour of selected power plant materials under various operating conditions KW - Korrosion KW - CCS Y1 - 2010 U6 - https://doi.org/http://dx.doi.org/10.1016/j.chemer.2010.05.006 ER - TY - CHAP A1 - Findeisen, Alexander A1 - Correa da Silva, Rodrigo A1 - Krautz, Hans Joachim T1 - Konzeptionelle und verfahrenstechnische Umsetzung eines 400 kWth-Verbrennungsversuchsstandes - erste Erfahrungen aus der Inbetriebsetzung Y1 - 2011 ER - TY - CHAP A1 - Findeisen, Alexander A1 - Abang, Roger Atini A1 - Krautz, Hans Joachim T1 - Corrosion Behaviour of Selected Power Plant Materials Under Oxyfuel Combustion Conditions Y1 - 2011 ER - TY - CHAP A1 - Findeisen, Alexander T1 - Analysis of corrosion behaviour of materials in oxyfuel fired power plants Y1 - 2008 ER - TY - GEN A1 - Dahash, Abdulrahman A1 - Mieck, Sebastian A1 - Ochs, Fabian A1 - Krautz, Hans Joachim T1 - A comparative study of two simulation tools for the technical feasibility in terms of modeling district heating systems: An optimization case study T2 - Simulation Modelling Practice and Theory N2 - District heating dynamic models arise as an alternative approach to in-situ experimental investigations. The main advantage of dynamic modeling and simulation is the possibility to avoid technical and operational risks that might occur during in-situ experimental investigations (e.g. heat demand is not met, damages in the energy systems etc.). Within this study, the authors present two models for an existing district heating system in Cottbus, Germany. One model is developed using the tool EBSILON Professional, while the other one is developed using the Simscape toolbox for physical modeling in Matlab/Simulink. The models were experimentally validated against measured data from the considered district heating system. The results show that the Simscape model has a better fit and better response than the EBSILON model. Yet, some discrepancies were found between the measured and the simulated data and, therefore, the uncertainties of the models were addressed. A comparative study between both tools is presented. The EBSILON models permit only unidirectional flow, whereas the Simscape toolbox permits reverse flow. Nevertheless, the EBSILON model outperforms the Simscape model in computation time. In addition, this study presents an approach for dynamic thermo-hydraulic modeling of district heating networks. This approach is utilized to examine the role of district heating networks as heat storage as an optimization configuration. The numerical results show less start-ups for additional heat sources. Yet, higher heat losses from the network are observed due to the installation of unburied pipelines. KW - Dynamic thermo-hydraulic modeling and simulation KW - Simscape KW - EBSILON Professional KW - District heating systems KW - Heating network as heat storage Y1 - 2019 U6 - https://doi.org/10.1016/j.simpat.2018.11.008 SN - 1569-190X VL - 91 SP - 48 EP - 68 ER - TY - CHAP A1 - Correa da Silva, Rodrigo A1 - Missagia, Bruna A1 - Tappe, Stephanie A1 - Findeisen, Alexander A1 - Krautz, Hans Joachim T1 - Development of low CO2 technologies for oxyfuel combustion in power plants Y1 - 2009 ER - TY - CHAP A1 - Correa da Silva, Rodrigo A1 - Krautz, Hans Joachim T1 - Theoretical analysis of heat transfer in a pulverized coal combustion chamber under O2/CO2 atmosphere Y1 - 2009 ER - TY - CHAP A1 - Correa da Silva, Rodrigo A1 - Krautz, Hans Joachim T1 - Theoretical investigation of pulverized coal combustion in air and in O2/CO2 atmospheres Y1 - 2009 ER - TY - GEN A1 - Correa da Silva, Rodrigo A1 - Kangwanpongpan, Tanin A1 - Findeisen, Alexander A1 - Krautz, Hans Joachim A1 - Meyer, Marco A1 - Roberg, Benedikt T1 - Oxy-fuel Combustion Studies Applying a Novel Test Facility - First Numerical Results Y1 - 2011 ER - TY - CHAP A1 - Correa da Silva, Rodrigo A1 - Kangwanpongpan, Tanin A1 - Findeisen, Alexander A1 - Krautz, Hans Joachim T1 - Aspects of Numerical Simulation of Coal Combustion under Oxyfuel Atmospheres Y1 - 2010 ER - TY - CHAP A1 - Correa da Silva, Rodrigo A1 - Kangwanpongpan, Tanin A1 - Findeisen, Alexander A1 - Krautz, Hans Joachim T1 - Description of a 0.4 MWth laboratory facility for oxy-fuel combustion studies Y1 - 2011 ER - TY - CHAP A1 - Chalupnik, Rolf W. A1 - Krautz, Hans Joachim A1 - Wirtz, M. A1 - Stuhlmüller, F. T1 - Applied Research for a New Generation of Lignite-Fired Combined Cycle Power Plant Using Circulating Pressurized Fluidized Bed Combustion Y1 - 2001 ER - TY - CHAP A1 - Chalupnik, Rolf W. A1 - Krautz, Hans Joachim A1 - Schulze, H. A1 - Stuhlmüller, F. A1 - Thielen, W. T1 - Plant studies and experiments for a lignite-fired combined-cycle power plant using circulating pressurized fluidized bed combustion Y1 - 1999 ER - TY - THES A1 - Chalupnik, Rolf W. T1 - Druckwirbelschichtkraftwerke : Kombikraftwerke mit Druckwirbelschichtfeuerung ; Entwicklung für Braunkohle unter besonderer Berücksichtigung des Emissionsverhaltens Y1 - 1999 SN - 3-925349-31-6 N1 - Dissertation u.d.T.: Kombikraftwerke mit Druckwirbelschichtfeuerung PB - Energiewirtschaft und Technik Verlagsges. CY - Essen ER - TY - CHAP A1 - Carotenuto, A. S. A1 - Correa da Silva, Rodrigo A1 - Rech, R. A1 - Marcilio, N. R. A1 - Smith Schneider, Paulo A1 - Krautz, Hans Joachim T1 - Preliminary Investigation of the Global Kinetic Parameters of low-rank coals under oxy-fuel conditions Y1 - 2011 ER - TY - JOUR A1 - Bär, F. A1 - Müller, S. A1 - Rost, M. T1 - Effiziente Braunkohleverstromung in einer Druckwirbelschichtfeuerung mit Teilvergasung Y1 - 2004 ER - TY - CHAP A1 - Asegehegn, Teklay Weldeabzgi A1 - Schreiber, Matthias A1 - Krautz, Hans Joachim T1 - Influence of Horizontal Tubes, Averaging Periods and Extraction Methods on the Hydrodynamics of Bubbling Gas-Solid Fluidized Beds Y1 - 2010 ER - TY - GEN A1 - Asegehegn, Teklay Weldeabzgi A1 - Schreiber, Matthias A1 - Krautz, Hans Joachim T1 - Numerical Study of Bubbling Gas-Solid Fluidized Beds Hydrodynamics: Influence of Immersed Horizontal Tubes and Data Analysis Y1 - 2011 UR - http://www.bepress.com/ijcre/vol9/A16 ER - TY - GEN A1 - Asegehegn, Teklay Weldeabzgi A1 - Schreiber, Matthias A1 - Krautz, Hans Joachim T1 - Investigation of bubble behavior in fluidized beds with and without immersed horizontal tubes using a digital image analysis technique Y1 - 2011 U6 - https://doi.org/http://dx.doi.org/10.1016/j.powtec.2011.03.025 ER - TY - GEN A1 - Asegehegn, Teklay Weldeabzgi A1 - Schreiber, Matthias A1 - Krautz, Hans Joachim T1 - Numerical simulation and experimental validation of bubble behavior in 2D gas-solid fluidized beds with immersed horizontal tubes Y1 - 2011 U6 - https://doi.org/http://dx.doi.org/10.1016/j.ces.2011.07.056 ER - TY - GEN A1 - Asegehegn, Teklay Weldeabzgi A1 - Schreiber, Matthias A1 - Krautz, Hans Joachim T1 - Influence of two- and three-dimensional simulations on bubble behaviorin gas-solid fluidized beds with and without immersed horizontal tubes Y1 - 2012 U6 - https://doi.org/10.1016/j.powtec.2011.11.050 ER - TY - GEN A1 - Asegehegn, Teklay Weldeabzgi A1 - Lechner, Stefan A1 - Merzsch, Matthias A1 - Schreiber, Matthias A1 - Silbermann, Rico A1 - Krautz, Hans Joachim A1 - Höhne, Olaf T1 - Das DDWT-Verfahren als Schlüsseltechnologie zukünftiger Braunkohlekraftwerke Y1 - 2011 ER - TY - CHAP A1 - Asegehegn, Teklay Weldeabzgi A1 - Krautz, Hans Joachim T1 - Numerical study of bubble hydrodynamics for gas-solid fluidized bedswith and without horizontal tubes Y1 - 2010 ER - TY - CHAP A1 - Asegehegn, Teklay Weldeabzgi A1 - Krautz, Hans Joachim T1 - Numerical study of solids motion and distribution in gas-solid fluidized beds: influence of immersed horizontal tubes Y1 - 2009 ER - TY - CHAP A1 - Asegehegn, Teklay Weldeabzgi A1 - Krautz, Hans Joachim T1 - Hydrodynamic simulation of gas-solid bubbling fluidized bed containing horizontal tubes Y1 - 2009 ER - TY - THES A1 - Asegehegn, Teklay Weldeabzgi T1 - Investigation of bubble hydrodynamics in gas-solid fluidized beds containing immersed horizontal tube banks for lignite drying application Y1 - 2012 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:co1-opus-23578 UR - http://opus.kobv.de/btu/volltexte/2012/2357/ ER - TY - CHAP A1 - Altmann, H. A1 - Krautz, Hans Joachim T1 - Das CO2-freie Pilotkraftwerk von vattenfall Europe Generation Y1 - 2006 ER - TY - GEN A1 - Akay, Ömer A1 - Bashkatov, Aleksandr A1 - Coy, Emerson A1 - Eckert, Kerstin A1 - Einarsrud, Kristian Etienne A1 - Friedrich, Andreas A1 - Kimmel, Benjamin A1 - Loos, Stefan A1 - Mutschke, Gerd A1 - Röntzsch, Lars A1 - Symes, Mark D. A1 - Yang, Xuegeng A1 - Brinkert, Katharina T1 - Electrolysis in reduced gravitational environments: current research perspectives and future applications T2 - npj Microgravity N2 - Electrochemical energy conversion technologies play a crucial role in space missions, for example, in the Environmental Control and Life Support System (ECLSS) on the International Space Station (ISS). They are also vitally important for future long-term space travel for oxygen, fuel and chemical production, where a re-supply of resources from Earth is not possible. Here, we provide an overview of currently existing electrolytic energy conversion technologies for space applications such as proton exchange membrane (PEM) and alkaline electrolyzer systems. We discuss the governing interfacial processes in these devices influenced by reduced gravitation and provide an outlook on future applications of electrolysis systems in, e.g., in-situ resource utilization (ISRU) technologies. A perspective of computational modelling to predict the impact of the reduced gravitational environment on governing electrochemical processes is also discussed and experimental suggestions to better understand efficiency-impacting processes such as gas bubble formation and detachment in reduced gravitational environments are outlined. KW - Elektrolyse KW - electrolysis Y1 - 2022 UR - https://www.nature.com/articles/s41526-022-00239-y#citeas U6 - https://doi.org/10.1038/s41526-022-00239-y SN - 2373-8065 VL - 8 ER - TY - GEN A1 - Ahmels, Peter A1 - Voß, Ulrike A1 - Gago, Aldo A1 - Lettenmeier, Philipp A1 - Voglstätter, Christopher A1 - Schmitz, Steffen A1 - Kleinickel, Cindy A1 - Barsch, Markus A1 - Rockmann, Rico A1 - Pumpa, Martin A1 - Fischer, Ulrich A1 - Voigt, André T1 - Wasserstoff zur Windenergiespeicherung – Ergebnisse des Projektes WESpe T2 - HZwei: das Magazin für Wasserstoff und Brennstoffzellen KW - Wasserstoff KW - Energiespeicherung Y1 - 2018 UR - https://www.hzwei.info/wp-content/uploads/2019/03/HZwei_April_2018.pdf SN - 1862-393X VL - 18 IS - 2 SP - 28 EP - 30 ER - TY - CHAP A1 - Aha, Ulrich A1 - Manig, André A1 - Krautz, Hans Joachim T1 - Maintenance optimisation for the next generation of power plants Y1 - 2011 ER - TY - CHAP A1 - Aha, Ulrich A1 - Manig, André A1 - Krautz, Hans Joachim ED - Bérenguer, Christophe T1 - Modelling and maintenance optimisation for the next generation of power plants T2 - Advances in safety, reliability and risk management, proceedings of the European Safety and reliability Conference, ESREL 2011, Troyes, France, 18 - 22 September 2011 Y1 - 2011 SN - 978-0-415-68379-1 PB - CRC Press CY - Hoboken ER - TY - CHAP A1 - Aha, Ulrich A1 - Koch, Alexander A1 - Krautz, Hans Joachim T1 - Finding the optimal power plant maintenance strategy with fuzzy input data T2 - 11th International Probabilistic Safety Assessment and Management Conference and the Annual European Safety and Reliability Conference 2012, (PSAM11 ESREL 2012), Helsinki, Finland 25 - 29 June 2012, Vol. 1 Y1 - 2012 SN - 978-1-62276-436-5 SP - 341 EP - 347 PB - IAPSAM & ESRA CY - Red Hook, NY ER - TY - GEN A1 - Aha, Ulrich A1 - Findeisen, Alexander A1 - Krautz, Hans Joachim A1 - Kahlert, Joachim T1 - Korrosion und Instandhaltungsoptimierung CO2-armer Braunkohlekraftwerke unter geänderten Prozessbedingungen und -parametern Y1 - 2010 ER - TY - GEN A1 - Aha, Ulrich A1 - Findeisen, Alexander A1 - Krautz, Hans Joachim T1 - Maintenance optimization for large coal-fired power plants Y1 - 2011 ER - TY - CHAP A1 - Aha, Ulrich A1 - Findeisen, Alexander A1 - Krautz, Hans Joachim T1 - Korrosion und Instandhaltungsoptimierung unter geänderten Prozessbedingungen und -parametern Y1 - 2010 ER - TY - CHAP A1 - Aha, Ulrich A1 - Findeisen, Alexander A1 - Krautz, Hans Joachim T1 - Maintenance optimisation of large coal-fired power plants Y1 - 2010 ER - TY - GEN A1 - Aha, Ulrich A1 - Findeisen, Alexander A1 - Krautz, Hans Joachim T1 - INSTRA - eine Software für die Instandhaltungsoptimierung Y1 - 2009 ER - TY - CHAP A1 - Aha, Ulrich T1 - Auswirkungen unscharfer Eingangsdaten auf Verfügbarkeitssimulation und Instandhaltungsoptimierung Y1 - 2009 ER - TY - GEN A1 - Abang, Roger Atini A1 - Weiß, Sabine A1 - Krautz, Hans Joachim T1 - Impact of increased power plant cycling on the oxidation and corrosion of coal-fired superheater materials T2 - Fuel N2 - As power generation from variable renewable energy sources such as wind and solar power continues to increase in the future, fewer baseload power plants will be needed. As a result, high operational flexibility is becoming a vital requirement for conventional power plants to allow for the smooth integration of the variable renewable energy sources (v-RES) into the grid. To understand the impact of high operational flexibility (increased cycling) for coal-fired power plant materials, five commercial coal boiler superheater and reheater materials were investigated under isothermal and cyclic conditions for 1000 h each. The candidate alloys investigated were: T91, VM12-SHC, TP347-HFG, DMV304 HCu and DMV310 N. The results (weight change kinetics and metallographic analysis) after exposure at a metal surface temperature of 650 °C clearly showed the impact of increased flexibility on the corrosion and oxidation of the materials. Oxide growth (weight gain), metal loss, oxide spallation, and grain boundary attack were found to be more severe under cyclic conditions than under isothermal conditions. KW - Power plant flexibility, Isothermal oxidation, Cyclic oxidation, High temperature corrosion, Superheaters Y1 - 2018 U6 - https://doi.org/10.1016/j.fuel.2018.02.047 SN - 0016-2361 VL - 2018 IS - 220 SP - 521 EP - 534 ER - TY - GEN A1 - Abang, Roger Atini A1 - Lisk, Alexander A1 - Krautz, Hans Joachim T1 - Fireside corrosion of superheater materials under oxy-coal firing conditions T2 - Energy Procedia N2 - The present study investigates the fireside corrosion behavior of selected superheater materials, namely: T24, P92, VM12-SHC, A800HT, and 7RE10 under oxy-coal combustion atmospheres. Data on mass change, scale thickness, metal loss, surface morphology and micro-structural characteristics of corrosion products were obtained. The alloy specimens were analyzed by SEM-EDX, light microscopy and X-Ray diffraction techniques. The results after 2000 hours of exposure at a metal surface temperature of 600 °C indicate that metal wastage increased with decreasing Cr-content under oxy-coal conditions. Y1 - 2013 U6 - https://doi.org/10.1016/j.egypro.2013.08.035 SN - 1876-6102 VL - 40 SP - 304 EP - 311 ER - TY - CHAP A1 - Abang, Roger Atini A1 - Findeisen, Alexander A1 - Krautz, Hans Joachim T1 - Corrosion Investigation of Materials under Oxyfuel Firing Conditions Y1 - 2010 ER - TY - THES A1 - Abang, Roger Atini T1 - Thermodynamic modeling and experimental investigations of high temperature corrosion and oxidation due to increased power plant cycling KW - Cycling KW - Flexible generation KW - High temperature corrosion; Oxidation KW - Oxidation KW - Thermo-chemical modeling Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:co1-opus4-40032 ER -