@inproceedings{OwczarekKreulKrautz, author = {Owczarek, Christian and Kreul, Klaus-J{\"u}rgen and Krautz, Hans Joachim}, title = {Erste Untersuchungen des Str{\"o}mungsfeldes einer Zykloidbrennkammer. Konferenz Forschung f{\"u}r die Kraftwerkstechnik}, abstract = {Vortrag auf Konferenz Forschung f{\"u}r die Kraftwerkstechnik, D{\"u}sseldorf}, language = {de} } @inproceedings{OwczarekKrautzGriebeetal., author = {Owczarek, Christian and Krautz, Hans Joachim and Griebe, Steffen and Schrader, A. and Paulick, G.}, title = {Progressive combustion of lignite and sludge in atmospheric cycloid combustion system}, language = {en} } @inproceedings{OwczarekKrautzGriebe, author = {Owczarek, Christian and Krautz, Hans Joachim and Griebe, Steffen}, title = {Cycloidal combustion - a new concept for industrial combustion with low-calorific fuels}, language = {en} } @inproceedings{OwczarekKrautzGriebe, author = {Owczarek, Christian and Krautz, Hans Joachim and Griebe, Steffen}, title = {Entwicklung eines Feuerungssystems f{\"u}r die dezentrale W{\"a}rmeversorgung auf Basis von Braunkohle}, abstract = {Vortrag auf Tagung "Die neuen Kraftwerke der VEAG", BTU Cottbus}, language = {de} } @inproceedings{OwczarekFunke, author = {Owczarek, Christian and Funke, W.}, title = {Komponententestanlage f{\"u}r neue Kraftwerkstechniken}, language = {de} } @inproceedings{Owczarek, author = {Owczarek, Christian}, title = {Weiterentwicklung der Druckwirbelschichtfeuerung f{\"u}r Braunkohle}, language = {de} } @phdthesis{Owczarek, author = {Owczarek, Christian}, title = {Erste Untersuchungen des Str{\"o}mungsfeldes einer Zykloidbrennkammer anhand eines Kaltmodells}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus-1538}, language = {de} } @phdthesis{Ojong, author = {Ojong, Emile Tabu}, title = {Characterization of the Performance of PEM Water Electrolysis Cells operating with and without Flow Channels, based on Experimentally Validated Semi-empirical Coupled-Physics Models}, address = {Cottbus ; Senftenberg}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-46504}, pages = {XXV, 146}, abstract = {PEM water electrolysis is a clean and efficient conversion technology for hydrogen production and energy storage, especially when coupled with renewable energy sources. In spite of its many advantages, the high component and cell manufacturing costs of the conventional PEM electrolysis cell makes the PEM water electrolysis technology commercially less competitive vis-{\`a}-vis its peers. An alternative and cost effective cell design has been proposed which has up to a 25 \% costs advantage over the conventional cell. In this alternative cell design, the flow channel plate which bears the most material costs in the conventional cell design has been replaced with a 3-D Porous Transport Layer (PTL) structure. While both designs perform comparably the same at low to mid current density (0 - 2 A/cm²), it has been observed that the conventional cell by far out performs the low cost cell at high current density operations, due to increased mass transport limitation in the cell without flow channels. Since industrial and commercial hydrogen production efforts are focused towards high current density operation (> 3 A/cm²), it thus becomes obvious that, in order for the cost effective alternative cell design to establish itself over the conventional cell design, the mass transport issues at high current densities have to be well understood and described. This research work seeks to understand the source of, and to eliminate the mass transport losses in the cost effective alternative cell design in order to get it performing at least as good as the conventional cell design at current densities up to 5 A/cm². To meet this objective, 2-D non-isothermal semi-empirical fully-coupled models of both cell designs have been developed and experimentally validated. The developed validated models were then used as tools to simulate and predict the best operating conditions, design parameters and micro-structural properties of the PTL at which the mass transport issues in the design without flow channels will be at its minimum, so that both cells can exhibit comparable performance even at high current densities. The models developed in this work are based on a multi-physics approach in which thermodynamic, electrochemical, thermal and mass transport sub-models are coupled and solved numerically, to predict the cell polarization and individual overpotentials, as well as address heat and water management issues. The most unique aspect of this work however, is the development of own semi-empirical equations for predicting the mass transport overpotential imposed by the gas phase (bubbles) at high current densities. Also, for the very first time, calculated PEM water electrolysis polarization curves up to 5 A/cm² have been validated by own experimental data. The results show that, the operating temperature and pressure, inlet water flowrate and thickness of the PTL are the critical parameters for mitigating mass transport limitation at high current densities. In fact, it was found that, for the size of the cells studied (25 cm² active area each), when both cells are operating at the same temperature of 60 °C, the low cost cell design will have a comparable performance to the conventional designed cell even at 5 A/cm² current density when; the operating pressure is ≥ 5 bar, the feed water flowrate is ≥ 0.024l/min∙cm², PTL porosity is 50 \%, PTL pore size is ≥ 11 µm and PTL thickness is 0.5 mm. At these operating, design and micro-structural conditions, the predicted difference between the polarizations of both cells will be only ~10 mV at 5 A/cm² operating current density.}, language = {en} } @inproceedings{NimtzTillmannWieseetal., author = {Nimtz, Michael and Tillmann, Christine and Wiese, B. and Krautz, Hans Joachim}, title = {CO2-Transport im Kontext regenerativer Energieeinspeisung - Auswirkung von Lastwechselvorg{\"a}ngen auf CO2-Pipelines}, language = {de} } @inproceedings{NimtzKrautz, author = {Nimtz, Michael and Krautz, Hans Joachim}, title = {Evaluation of the GERG-2008 Equation of State for the Simulation of Oxyfuel Systems}, language = {en} } @misc{NimtzKlattWieseetal., author = {Nimtz, Michael and Klatt, Matthias and Wiese, Bernd and K{\"u}hn, Michael and Krautz, Hans Joachim}, title = {Modelling of the CO2 process- and transport chain in CCS systems - Examination of transport and storage processes}, series = {Chemie der Erde - Geochemistry}, volume = {70}, journal = {Chemie der Erde - Geochemistry}, number = {3}, issn = {0009-2819}, doi = {10.1016/j.chemer.2010.05.011}, pages = {185 -- 192}, language = {en} } @inproceedings{NimtzKlattWieseetal., author = {Nimtz, Michael and Klatt, Matthias and Wiese, B. and K{\"u}hn, M. and Krautz, Hans Joachim}, title = {CO2 Transport and Injection in CCS systems}, language = {de} } @inproceedings{NimtzKlattWiese, author = {Nimtz, Michael and Klatt, Matthias and Wiese, B.}, title = {CCS-Transportsystem - Untersuchung von Pipelinetransport und Injektion von CO2-reichen Fluiden}, language = {de} } @inproceedings{NimtzKlattKrautz, author = {Nimtz, Michael and Klatt, Matthias and Krautz, Hans Joachim}, title = {CO2 Transport - Pipeline Transport and Injection Technology}, language = {de} } @inproceedings{NimtzKlattKrautz, author = {Nimtz, Michael and Klatt, Matthias and Krautz, Hans Joachim}, title = {CO2 Transport - Technik und Betrieb}, language = {de} } @inproceedings{NimtzKlattKrautz, author = {Nimtz, Michael and Klatt, Matthias and Krautz, Hans Joachim}, title = {Untersuchung der Effekte in der CCS-Verfahrenskette - Modellierung der CO2-Prozess- und Transportkette vom Brennstoff bis zum Reservoir}, language = {de} } @inproceedings{NimtzKlattKrautz, author = {Nimtz, Michael and Klatt, Matthias and Krautz, Hans Joachim}, title = {The GERG-2008 equation of state and its application to the design of CCS-systems}, language = {de} } @inproceedings{NimtzKlatt, author = {Nimtz, Michael and Klatt, Matthias}, title = {Wechselwirkungen zwischen CO2-Abscheidung, Pipelinetransport und Injektion in saline Aquifere}, language = {de} } @inproceedings{Nimtz, author = {Nimtz, Michael}, title = {CO2-Separation Test Site: Demonstration Power Plant J{\"a}nschwalde}, language = {de} } @phdthesis{Nimtz, author = {Nimtz, Michael}, title = {Modellierung des Pipelinetransportes von CO₂-reichen Fluiden}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus4-38937}, pages = {392}, language = {de} } @phdthesis{Moeller, author = {M{\"o}ller, Jochen}, title = {M{\"o}glichkeiten und Grenzen der Nutzung erneuerbarer Energietr{\"a}ger am Beispiel des Landes Brandenburg}, publisher = {Brandenburgische Techn. Univ.}, address = {Cottbus}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-000000497}, language = {de} } @article{MoellerLoefflerMenkeetal., author = {M{\"o}ller, Joachim and L{\"o}ffler, Steffen and Menke, Dominik and Kalina, Hartmut}, title = {Bewertung erneuerbarer Energien im Land Brandenburg}, language = {de} } @article{MrozLoeffler, author = {Mroz, Marcin and L{\"o}ffler, Steffen}, title = {Moderne Kraftwerkskonzepte f{\"u}r fossile Brennstoffe}, language = {de} } @inproceedings{MontgomeryBjurmanHjornhedeetal., author = {Montgomery, M. and Bjurman, M. and Hjornhede, A. and Findeisen, Alexander and Krautz, Hans Joachim and Rombrecht, Hans-Bernd}, title = {High temperature corrosion investigation in an oxyfuel burner rig}, language = {de} } @inproceedings{MissagiaKrautz, author = {Missagia, Bruna and Krautz, Hans Joachim}, title = {Comparative analysis of Brazilian residual biomass for pellet production}, language = {en} } @misc{MissagiaGuerreroNarraetal., author = {Missagia, Bruna and Guerrero, Cinthya and Narra, Satyanarayana and Sun, Yaoming and Ay, Peter and Krautz, Hans Joachim}, title = {Physicomechanical properties of rice husk pellets for energy generation}, language = {en} } @inproceedings{MissagiaGuerreroNarraetal., author = {Missagia, Bruna and Guerrero, Cinthya and Narra, Satyanarayana and Krautz, Hans Joachim and Ay, Peter}, title = {Physical characterization of Brazilian agricultural and forestry residues aiming the production of energy pellets}, language = {en} } @inproceedings{MissagiaGuerreroKrautzetal., author = {Missagia, Bruna and Guerrero, Cinthya and Krautz, Hans Joachim and Schluchter, Wolfgang}, title = {Implications of the diffusion of biomass based energy technologies: The case of pellets from agricultural subproducts in Brazil}, language = {en} } @misc{MissagiaFerreiraSilvaCorreaKrautzetal., author = {Missagia, Bruna and Ferreira Silva Correa, Mauricio and Krautz, Hans Joachim and Ay, Peter and Schluchter, Wolfgang}, title = {Agricultural and forestry residues as an alternative energy source for Brazil - the production of biomass pellets}, language = {de} } @phdthesis{Missagia, author = {Missagia, Bruna}, title = {Agricultural and forestry residues for decentralized energy generation in Brazil}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus-25180}, pages = {214}, language = {en} } @misc{MieckKrautz, author = {Mieck, Sebastian and Krautz, Hans Joachim}, title = {Systematic analysis and preparation of high resolution in-situ measurements for the estimation of PV module parameters}, series = {VGB PowerTech}, volume = {98}, journal = {VGB PowerTech}, number = {8}, issn = {1435-3199}, pages = {75 -- 81}, abstract = {In the last two decades, a rapid expansion of photovoltaic (PV) power plants of different sizes has taken place. Along with this, the interest from science and industry is growing, exploring the strengths and weaknesses of this technology as well as further developing the efficiency in its production and operation. For planning and operating of PV power plants, valid energy yield forecasts are desirable. These forecasts are also important to draw conclusions for the monitoring of future PV technologies. The analysis, evaluation and processing of meteorological and technical measurement datasets play an essential role. In this article, high-resolution measurement data sets of a mobile, autarkic test system are analyzed firstly. The measured data are checked for plausibility and validity with the corresponding methods. After this observations and phenomena with meteorological cause are described. In a second step, a practicable procedure for the preparation of the measurement data is presented, in order to make it suitable for further calculations, e.g. identification of photovoltaic module parameters for energy yield calculations. The focus is particularly on the flexibility, adaptability and code performance of the processing procedure. Results, evaluations and outlooks on the methods used, measurement data and selected software packages are made.}, language = {en} } @inproceedings{MerzschWiedemannPosseltetal., author = {Merzsch, Matthias and Wiedemann, Philipp and Posselt, Joachim and Krautz, Hans Joachim}, title = {Druckaufgeladene Dampfwirbelschicht-Trocknung (DDWT) von Braunkohlen}, series = {45. Kraftwerkstechnisches Kolloquium, Dresden, Oktober 2013}, booktitle = {45. Kraftwerkstechnisches Kolloquium, Dresden, Oktober 2013}, publisher = {TK-Verl.}, address = {Neuruppin}, isbn = {978-3-944310-04-6}, language = {de} } @inproceedings{MerzschSilbermannLechneretal., author = {Merzsch, Matthias and Silbermann, Rico and Lechner, Stefan and Krautz, Hans Joachim}, title = {Druckaufgeladene Dampfwirbelschicht-Trocknung (DDWT) von Braunkohlen: Neuste Betriebsergebnisse von der BTU-Versuchsanlage}, language = {de} } @inproceedings{MerzschPosseltWiedemannetal., author = {Merzsch, Matthias and Posselt, Joachim and Wiedemann, Philipp and Lechner, Stefan and Krautz, Hans Joachim}, title = {Druckaufgeladene Dampfwirbelschicht-Trocknung (DDWT) von Braunkohlen: Grundlagenuntersuchungen zur verfahrenstechnischen Optimierung der Dampfwirbelschicht-Trocknung von Braunkohlen}, series = {Kraftwerkstechnik, Bd. 4, 44. Kraftwerkstechnisches Kolloquium, Dresden}, booktitle = {Kraftwerkstechnik, Bd. 4, 44. Kraftwerkstechnisches Kolloquium, Dresden}, publisher = {TK-Verlag}, address = {Nietwerder}, isbn = {978-3-935317-87-0}, pages = {923 -- 934}, language = {de} } @inproceedings{MerzschPosseltWiedemannetal., author = {Merzsch, Matthias and Posselt, Joachim and Wiedemann, Philipp and Krautz, Hans Joachim}, title = {Druckaufgeladene Dampfwirbelschicht-Trocknung von Braunkohle}, series = {Nachhaltige Energieversorgung und Integration von Speichern, Tagungsband zur NEIS 2015}, booktitle = {Nachhaltige Energieversorgung und Integration von Speichern, Tagungsband zur NEIS 2015}, editor = {Schulz, Detlef}, publisher = {Springer}, address = {Wiesbaden}, isbn = {978-3-658-10957-8}, pages = {160 -- 165}, language = {de} } @misc{MerzschLechnerKrautz, author = {Merzsch, Matthias and Lechner, Stefan and Krautz, Hans Joachim}, title = {Heat-transfer from single horizontal tubes in fluidized beds: Influence of tube diameter, moisture and diameter-definition by Geldart C fines content}, series = {Powder Technology}, journal = {Powder Technology}, issn = {1873-328X}, doi = {10.1016/j.powtec.2012.12.002}, language = {en} } @misc{Merzsch, author = {Merzsch, Matthias}, title = {Druckaufgeladene Dampfwirbelschicht-Trocknung von Braunkohle - Eine kleine Reise durch die Geschichte der Trocknung speziell die der Braunkohlen}, series = {VGB PowerTech}, volume = {98}, journal = {VGB PowerTech}, number = {8}, issn = {1435-3199}, pages = {49 -- 57}, abstract = {At first I was wondering what the structure of an article about pressurized steam fluidized bed drying could look like. After some thought, I knew that it should be divided into two parts. In order to highlight the creative and inventive spirit of former engineers, as well as their struggle to increase the efficiency of drying machines, a historical outline of the drying technology in general and the concept of steam fluidized bed drying in particular will form the first part of the article. The second part will present the practical and research contribution of Prof. Krautz and his colleagues to the advancement of this field. The article as a whole will be able to provide an overview of the coal/lignite drying, with focus on the pressurized steam fluidized bed drying principle implemented in the Lusatian mining area.}, language = {de} } @inproceedings{MenkeKrautzMandel, author = {Menke, Dominik and Krautz, Hans Joachim and Mandel, Hans}, title = {Modelling of availability and system dynamic of large scale fossil fuel fired power plants}, language = {en} } @article{MenkeKrautz, author = {Menke, Dominik and Krautz, Hans Joachim}, title = {Simulation of availability and process dynamics of large scale fossil fuel fired power plants}, language = {de} } @inproceedings{MenkeKrautz, author = {Menke, Dominik and Krautz, Hans Joachim}, title = {Dynamische Modellierung und Verf{\"u}gbarkeitsmodellierung großer braunkohlegefeuerter Kraftwerke}, language = {de} } @inproceedings{MenkeKlattKrautzetal., author = {Menke, Dominik and Klatt, Matthias and Krautz, Hans Joachim and Gade, Udo and Mandel, Hans}, title = {Gemeinsame Analyse der Prozesstechnik und Verf{\"u}gbarkeit moderner Großkraftwerke}, language = {de} } @inproceedings{MenkeHammerSattleretal., author = {Menke, Dominik and Hammer, K. and Sattler, E. and Walter, E.}, title = {Analyse, Bewertung und Verbesserung der technischen Zuverl{\"a}ssigkeit des Heizkraftwerkes Cottbus}, series = {Verbrennung und Feuerungen, Tagung Cottbus, 9. und 10. September 2003, 21. Deutscher Flammentag}, booktitle = {Verbrennung und Feuerungen, Tagung Cottbus, 9. und 10. September 2003, 21. Deutscher Flammentag}, publisher = {VDI-Verlag}, address = {D{\"u}sseldorf}, isbn = {3-18-091750-4}, pages = {93 -- 98}, language = {de} } @phdthesis{Menke, author = {Menke, Dominik}, title = {Modellierung von Verf{\"u}gbarkeit und Systemdynamik fossil befeuerter Großkraftwerke}, publisher = {dissertation.de}, address = {Berlin}, isbn = {3-89825-657-X}, language = {de} } @inproceedings{MartinLoefflerKrautz, author = {Martin, J{\"o}rg S. and L{\"o}ffler, Steffen and Krautz, Hans Joachim}, title = {Druckaufgeladene Dampfwirbelschichttrocknung grubenfeuchter Braunkohle - Innovatives Verfahren zur Erh{\"o}hung des Kraftwerkswirkungsgrades und Reduzierung der Stromgestehungskosten}, language = {de} } @inproceedings{MartinHoehneLechneretal., author = {Martin, J{\"o}rg S. and H{\"o}hne, Olaf and Lechner, Stefan and Krautz, Hans Joachim and Jentsch, N.}, title = {Druckaufgeladene Dampfwirbelschicht-Trocknung (DDWT) von Braunkohlen: Von den Betriebsergebnissen des Versuchstrockners (0,5 t/h) zur Konzeptentwicklung der Großtechnischen Versuchsanlage (GTVA, 70 t/h)}, language = {de} } @inproceedings{MartinHoehneKrautzetal., author = {Martin, J{\"o}rg S. and H{\"o}hne, Olaf and Krautz, Hans Joachim and Mandel, Hans}, title = {Druckaufgeladene Dampfwirbelschichttrocknung von Braunkohlen - Inbetriebnahme und erste Untersuchungsergebnisse am Versuchstrockner der BTU Cottbus}, language = {de} } @inproceedings{MartinHoehneKrautz, author = {Martin, J{\"o}rg S. and H{\"o}hne, Olaf and Krautz, Hans Joachim}, title = {Druckaufgeladene Dmpfwirbelschichttroknung als Weg zur Effizienzsteigerung in Braunkohlekraftwerken: Betriebsergebnisse vom Versuchstrockner der BTU Cottbus}, language = {de} } @inproceedings{LoefflerMartin, author = {L{\"o}ffler, Steffen and Martin, J{\"o}rg S.}, title = {Untersuchungen zu Einflussgr{\"o}ßen auf die W{\"a}rme{\"u}bertragung bei der druckaufgeladenen Dampfwirbelschichttrocknung von Braunkohle}, language = {de} } @inproceedings{LoefflerKrautz, author = {L{\"o}ffler, Steffen and Krautz, Hans Joachim}, title = {Fortschrittliche Verbrennungstechniken f{\"u}r dezentrale Energieanlagen}, abstract = {Vortrag auf VIK-Arbeitskreis "Energietechnische Zukunftskonzepte", G{\"o}rlitz}, language = {de} } @misc{Loeffler, author = {L{\"o}ffler, Steffen}, title = {Kraftwerkstechnik - ein Ingenieurbereich mit Zukunft}, language = {de} }