@article{Krautz, author = {Krautz, Hans Joachim}, title = {CO2-freies Kraftwerk ab 2020}, language = {de} } @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{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 = {CO2 Transport - Pipeline Transport and Injection Technology}, language = {de} } @inproceedings{RogollWalterKrautz, author = {Rogoll, A. and Walter, E. and Krautz, Hans Joachim}, title = {Co-generation plant Cottbus with ABB P200- Pressurized Fluidized Bed Combustion}, language = {en} } @inproceedings{KrautzKirmse, author = {Krautz, Hans Joachim and Kirmse, Dietrich}, title = {Co-Combustion of biomass in lignite-fired power plants}, language = {en} } @inproceedings{Krautz, author = {Krautz, Hans Joachim}, title = {Climate change and the importance of carbon management}, language = {en} } @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{KangwanpongpanKlattKrautz, author = {Kangwanpongpan, Tanin and Klatt, Matthias and Krautz, Hans Joachim}, title = {Challenges of oxyfuel combustion modeling for carbon capture}, language = {en} } @inproceedings{KrautzKlattFindeisen, author = {Krautz, Hans Joachim and Klatt, Matthias and Findeisen, Alexander}, title = {CCT \& CCS Technologies}, language = {en} } @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{RombrechtKrautz, author = {Rombrecht, Hans-Bernd and Krautz, Gerd}, title = {Bionmischpellets - Ergebnisse des Forschungsprojektes NEBrA}, language = {de} } @inproceedings{RombrechtKrautz, author = {Rombrecht, Hans-Bernd and Krautz, Gerd}, title = {Biomischpellets aus landwirtschaftlichen Reststoffen - die Alternative zu {\"O}l und Gas}, language = {de} } @inproceedings{RombrechtKrautz, author = {Rombrecht, Hans-Bernd and Krautz, Gerd}, title = {Biomischpellets aus landwirtschaftlichen Reststoffen - die Alternative zu Holz}, language = {de} } @inproceedings{Rombrecht, author = {Rombrecht, Hans-Bernd}, title = {Biomischpellets - Ergebnisse des Forschungsprojektes NEBrA}, language = {de} } @inproceedings{Tannert, author = {Tannert, Daniel}, title = {Biomischpellets - Ergebnisse des Forschugsprojektes NEBrA}, language = {de} } @inproceedings{Rombrecht, author = {Rombrecht, Hans-Bernd}, title = {Biomasseverwertung in Brandenburg}, 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} } @techreport{KlattPfeifferBendigetal., author = {Klatt, Matthias and Pfeiffer, Klaus and Bendig, Martin and Platta, Kristian and Matzekat, David}, title = {Betrachtungen zur Mindesterzeugung von Braunkohlekraftwerken im Kontext des Netzbetriebs}, publisher = {Brandenburgische Technische Universit{\"a}t, Fachgebiet Dezentrale Energiesysteme [u.a.]}, address = {Cottbus ; Senftenberg}, language = {de} } @inproceedings{KahlertKrautz, author = {Kahlert, Joachim and Krautz, Hans Joachim}, title = {Beispiele f{\"u}r Instandhaltung mit Risiko im KW Lippendorf}, language = {de} } @misc{Katzer, author = {Katzer, Christian}, title = {Bedarf an Verbrennungsforschung f{\"u}r Braunkohlekraftwerke - Am Beispiel des Lehrstuhl Kraftwerkstechnik der BTU Cottbus- Senftenberg}, series = {VGB PowerTech}, volume = {98}, journal = {VGB PowerTech}, number = {8}, issn = {1435-3199}, pages = {58 -- 64}, abstract = {From its foundation of the chair of power plant technology at Brandenburg University of Technology Cottbus - Senftenberg, the combustion research has engaged with current issues of conventional power plant technology. The focus of his research activity was starting from development of technology to maximize the efficiency, switched to the new research field of oxyfuel technologies and working currently on questions about operational flexibility as reaction of changes in the current energy sector. There are many concepts for increasing plant flexibility, but without optimization of flame monitoring and re-evaluation of existing limits, this potential for optimization can't be sufficiently used. The current research project to increasing thermal plant flexibility of existing coal-fired power plants is implementing the necessity for analysis and optimization research. Therefore, one goal is a significant progress in the evaluation of cyclic operation with higher load transients and load cycles of coal-fired power plants. Furthermore, a research evaluation about the effects on the components life of components of the water-steam cycle is possible.}, language = {de} } @inproceedings{Aha, author = {Aha, Ulrich}, title = {Auswirkungen unscharfer Eingangsdaten auf Verf{\"u}gbarkeitssimulation und Instandhaltungsoptimierung}, language = {de} } @misc{SchleifringRistauTaube, author = {Schleifring, Birgit and Ristau, Herbert and Taube, Stefan}, title = {Aufbau der kraftwerkstechnischen Großlabore an der BTU Cottbus und am Energieressourcen-Institut in J{\"a}nschwalde}, language = {de} } @inproceedings{CorreadaSilvaKangwanpongpanFindeisenetal., author = {Correa da Silva, Rodrigo and Kangwanpongpan, Tanin and Findeisen, Alexander and Krautz, Hans Joachim}, title = {Aspects of Numerical Simulation of Coal Combustion under Oxyfuel Atmospheres}, language = {de} } @inproceedings{ZiemsTannertKrautz, author = {Ziems, Christian and Tannert, Daniel and Krautz, Hans Joachim}, title = {Approaches for simulation of an advanced alkaline water electrolyzer prototype}, series = {Proceedings of the 14th International Symposium on Heat Transfer and Renewable Sources of Energy, Szczecin-Miedzyzdroje, Poland, September 06-09, 2012}, booktitle = {Proceedings of the 14th International Symposium on Heat Transfer and Renewable Sources of Energy, Szczecin-Miedzyzdroje, Poland, September 06-09, 2012}, publisher = {Wydawnistwo Uczelnianie ZUT}, address = {Szczecinie}, isbn = {978-83-7663-121-9}, language = {en} } @inproceedings{ChalupnikKrautzWirtzetal., author = {Chalupnik, Rolf W. and Krautz, Hans Joachim and Wirtz, M. and Stuhlm{\"u}ller, F.}, title = {Applied Research for a New Generation of Lignite-Fired Combined Cycle Power Plant Using Circulating Pressurized Fluidized Bed Combustion}, language = {en} } @inproceedings{Warnecke, author = {Warnecke, Martin}, title = {Ansatz zur Modellierung einer Speicherkomponente in einer Monte-Carlo-Simulation zur Ermittlung der Zeit- und Arbeitsverf{\"u}gbarkeit}, language = {de} } @inproceedings{Findeisen, author = {Findeisen, Alexander}, title = {Analysis of corrosion behaviour of materials in oxyfuel fired power plants}, language = {en} } @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} } @misc{VoigtFischerTannertetal., author = {Voigt, Andr{\´e} and Fischer, Ulrich and Tannert, Daniel and Krautz, Hans Joachim}, title = {Analyse erneuerbarer P2H2 Energiesystemkonfigurationen unter Verwendung von Matlab}, series = {Nutzung regenerativer Energiequellen und Wasserstofftechnik 2017 ; 24. Symposium Nutzung Regenerativer Energiequellen und Wasserstofftechnik, Stralsund, 09. bis 11. November 2017}, journal = {Nutzung regenerativer Energiequellen und Wasserstofftechnik 2017 ; 24. Symposium Nutzung Regenerativer Energiequellen und Wasserstofftechnik, Stralsund, 09. bis 11. November 2017}, publisher = {HOST - Hochschule Stralsund}, address = {Stralsund}, isbn = {978-3-9817740-3-0}, pages = {143 -- 147}, language = {de} } @inproceedings{TappeKrautz, author = {Tappe, Stephanie and Krautz, Hans Joachim}, title = {An experimental approach to the kinetics of the combustion in O2/CO2-atmospheres}, language = {de} } @inproceedings{TappeKrautz, author = {Tappe, Stephanie and Krautz, Hans Joachim}, title = {ALVA 20: a 20 kWth atmospheric laboratory test facility to investigate the combustion behaviour under "close-to-reality" conditions}, language = {en} } @article{TappeKrautz, author = {Tappe, Stephanie and Krautz, Hans Joachim}, title = {ALVA 20 - Eine Laboranlage zur Untersuchung des Verbrennungsverhaltens in einer O2/CO2-Atmosph{\"a}re}, language = {de} } @inproceedings{TappeKrautz, author = {Tappe, Stephanie and Krautz, Hans Joachim}, title = {ALVA 20 - Eine Atmosph{\"a}rische Laborverbrennungsanlage zur Bestimmung der Verbrennungskinetik unter Oxyfuel-Bedingungen}, language = {de} } @inproceedings{ZiemsKrautz, author = {Ziems, Christian and Krautz, Hans Joachim}, title = {Alkalische Elektrolyse - Kernkomponente eines Hybridkraftwerks im Kontext Power to Gas}, language = {de} } @inproceedings{ZiemsKrautz, author = {Ziems, Christian and Krautz, Hans Joachim}, title = {Alkalische Druckelektrolyse - Schl{\"u}sseltechnologie f{\"u}r zuk{\"u}nftige Energie- und Speicherkonzepte}, series = {4. Energiefachtagung, Cottbus, 2012}, booktitle = {4. Energiefachtagung, Cottbus, 2012}, language = {de} } @inproceedings{ZiemsTannertKrautz, author = {Ziems, Christian and Tannert, Daniel and Krautz, Hans Joachim}, title = {Alkalische Druckelektrolyse - Projektvorstellung und Modellans{\"a}tze zur Simulation}, language = {de} } @inproceedings{WenskeTillmannKrautz, author = {Wenske, Michael and Tillmann, Christine and Krautz, Hans Joachim}, title = {Aktuelle Entwicklungen der alkalischen Elektrolyse}, series = {4. Energiefachtagung, Cottbus, 2012}, booktitle = {4. Energiefachtagung, Cottbus, 2012}, language = {de} } @inproceedings{IfwerWolfAnhedenetal., author = {Ifwer, Karin and Wolf, Jens and Anheden, Marie and Sarunac, Nenad and Bullinger, Charlie and Ness, Marc and H{\"o}hne, Olaf}, title = {Air/Nitrogen lignite dryer as an alternative to a stream dryer in a power plant using oxyfuel technique for CO2 capture}, 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{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} } @inproceedings{SchierackKrautzPriesmeieretal., author = {Schierack, Frank and Krautz, Hans Joachim and Priesmeier, U. and Nies, T.}, title = {Advancement of circulating pressurized fluidized bed combustion up to plants of the 2nd Generation}, isbn = {3-18-091535-9}, language = {en} } @inproceedings{WalterAlmhemKrautz, author = {Walter, E. and Almhem, P. and Krautz, Hans Joachim}, title = {A Lignite Fired Combined Cycle Heat and Power Plant using Presssurized Fluidized Bed Combustion}, language = {en} } @misc{DahashMieckOchsetal., author = {Dahash, Abdulrahman and Mieck, Sebastian and Ochs, Fabian and Krautz, Hans Joachim}, title = {A comparative study of two simulation tools for the technical feasibility in terms of modeling district heating systems: An optimization case study}, series = {Simulation Modelling Practice and Theory}, volume = {91}, journal = {Simulation Modelling Practice and Theory}, issn = {1569-190X}, doi = {10.1016/j.simpat.2018.11.008}, pages = {48 -- 68}, abstract = {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.}, language = {en} } @inproceedings{Krautz, author = {Krautz, Hans Joachim}, title = {"Ausblick auf zuk{\"u}nftige Entwicklungen der Braunkohle-Kraftwerkstechnologien"}, language = {de} }