@inproceedings{ZiemsTannertKrautz, author = {Ziems, Christian and Tannert, Daniel and Krautz, Hans Joachim}, title = {Grundlagenforschung zur Optimierung des alkalischen Druckelektrolyseprozesses am 25 bar Einzel-Zell-Versuchsstand - Projektvorstellung}, series = {19. Symposium - Nutzung regenerativer Energiequellen und Wasserstofftechnik, 8. - 10. November 2012 Stralsund}, booktitle = {19. Symposium - Nutzung regenerativer Energiequellen und Wasserstofftechnik, 8. - 10. November 2012 Stralsund}, publisher = {Fachhochschule}, address = {Stralsund}, isbn = {978-3-9813334-5-9}, language = {de} } @inproceedings{ZiemsKrautz, author = {Ziems, Christian and Krautz, Hans Joachim}, title = {Grid integration of renewable energies and hydrogen research at BTU Cottbus}, series = {Dena Konferenz "Power to Gas - innovative Systeml{\"o}sungen f{\"u}r ein zukunftsf{\"a}higes Energiesystem entwickeln", Berlin, 2012}, booktitle = {Dena Konferenz "Power to Gas - innovative Systeml{\"o}sungen f{\"u}r ein zukunftsf{\"a}higes Energiesystem entwickeln", Berlin, 2012}, language = {en} } @inproceedings{KrautzGuerreroAmezcuaZiems, author = {Krautz, Hans Joachim and Guerrero Amezcua, Cinthya Larissa and Ziems, Christian}, title = {Future Developments of the Photovoltaic Technologies in germany and their Consequences in the Power Network stability, the System security and the demand of chemical long-term storage}, series = {SASEC 2015, Third Southern African Solar Energy Conference, 11 - 13 May 2015, Kruger National Park, South Africa}, booktitle = {SASEC 2015, Third Southern African Solar Energy Conference, 11 - 13 May 2015, Kruger National Park, South Africa}, pages = {383 -- 388}, language = {en} } @misc{KrautzNimtz, author = {Krautz, Hans Joachim and Nimtz, Michael}, title = {Flexible Operation of CCS Power Plants to Match Variable Renewable Energies}, series = {Energy Procedia}, volume = {2013}, journal = {Energy Procedia}, number = {40}, issn = {1876-6102}, doi = {10.1016/j.egypro.2013.08.034}, pages = {294 -- 303}, abstract = {The German Energiewende is resulting in high grid load changes caused by renewable energies. Therefore flexibility of power plants is getting more and more important. Future CCS power plants are usually equipped with more components than conventional power plants, resulting in a more complex and inert reaction on changes in power output. Additionally, due to the change in price structures and higher fixed and operational costs for CCS power plants, it is harder for them to be economically efficient. This study will show different options to increase the flexibility of CCS power plants and evaluate their benefits.}, language = {en} } @misc{KrautzCorreadaSilvaKangwanpongpan, author = {Krautz, Hans Joachim and Corr{\^e}a da Silva, Rodrigo and Kangwanpongpan, Tanin}, title = {Flame pattern, temperatures and stability limits of pulverized oxy-coal combustion}, series = {Fuel : the science and technology of fuel and energy}, journal = {Fuel : the science and technology of fuel and energy}, number = {Vol. 115}, issn = {0016-2361}, doi = {10.1016/j.fuel.2013.07.049}, pages = {507 -- 520}, abstract = {The challenges in maintaining a stable oxy-coal flame have been reported in the open literature. In case of pulverized coal combustion, narrower flammable regimes arise not only of differences in the feed gas composition, but also due to changes in the flow dynamics because of reduced volume flow rate through the burners to match similar temperatures and radiative heat transfer within the furnace. The present work focuses on the study of flame structure and stability of pre-dried lignite fired by a staged feed-gas burner. Experimental runs were carried out in a 0.40 MWth laboratory facility, with the objective of investigating the effects of swirl strength and feed gas distribution in the burner registers. To assess the experimental data, a numerical study of the non-reacting flow in the near burner region is performed. Predicted flow pattern and flame images show that the primary fuel jet penetrates the internal recirculation zone, forming an annular doughnut reverse flow region for both firing conditions and resembling a type-1 flame pattern. Temperature measurements indicate that the feed gas distribution among the burner registers control the flame temperature in parallel with the swirl number in both air-fired and oxy-fired environments. The oxy-fuel cases exhibite markedly reduced temperatures on the flame axis. This difference in the core arises not just from the more pronounced penetration depth of the primary jet, but also due to reaction mechanisms including pyrolysis and gasification reactions at the higher concentrations of CO2 and water vapor. Flame stabilization is shown to be strongly dependent on an appropriate distribution of the feed gas and strength of swirling flow in the burner front. The results correlated in terms of swirl number, secondary/tertiary flow ratio and secondary/primary axial momentum point to similarities in the stability limits between air-firing and oxy-firing.}, language = {en} } @inproceedings{ZiemsTannertKrautz, author = {Ziems, Christian and Tannert, Daniel and Krautz, Hans Joachim}, title = {First modeling results of an advanced pressurized alkaline electrolyzer for hydrogen production}, series = {19. World Hydrogen Energy Conference, Toronto, 2012}, booktitle = {19. World Hydrogen Energy Conference, Toronto, 2012}, language = {en} } @misc{AbangLiskKrautz, author = {Abang, Roger Atini and Lisk, Alexander and Krautz, Hans Joachim}, title = {Fireside corrosion of superheater materials under oxy-coal firing conditions}, series = {Energy Procedia}, volume = {40}, journal = {Energy Procedia}, issn = {1876-6102}, doi = {10.1016/j.egypro.2013.08.035}, pages = {304 -- 311}, abstract = {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.}, language = {en} } @inproceedings{AhaKochKrautz, author = {Aha, Ulrich and Koch, Alexander and Krautz, Hans Joachim}, title = {Finding the optimal power plant maintenance strategy with fuzzy input data}, series = {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}, booktitle = {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}, publisher = {IAPSAM \& ESRA}, address = {Red Hook, NY}, isbn = {978-1-62276-436-5}, pages = {341 -- 347}, language = {en} } @inproceedings{KatzerKlattLisketal., author = {Katzer, Christian and Klatt, Matthias and Lisk, Alexander and Krautz, Hans Joachim}, title = {Experimentelle Untersuchungen zur Entwicklung eines elektrisch z{\"u}ndenden Kohlestaubbrenners}, series = {Kraftwerkstechnik 2015, Strategien, Anlagentechnik und Betrieb, Beitr{\"a}ge des 47. Kraftwerkstechnischen Kolloquiums vom 13. und 14. Oktober 2015 in Dresden}, booktitle = {Kraftwerkstechnik 2015, Strategien, Anlagentechnik und Betrieb, Beitr{\"a}ge des 47. Kraftwerkstechnischen Kolloquiums vom 13. und 14. Oktober 2015 in Dresden}, publisher = {SAXONIA}, address = {Freiberg}, isbn = {978-3-934409-70-5}, pages = {279 -- 288}, language = {de} } @misc{KatzerKlattLisketal., author = {Katzer, Christian and Klatt, Matthias and Lisk, Alexander and Krautz, Hans Joachim}, title = {Erste Untersuchungsergebnisse an einem elektrisch z{\"u}ndenden Kohlenstaubbrennersystem}, series = {Verbrennung und Feuerung, 27. Deutscher Flammentag, Clausthal-Zellerfeld, 16. und 17. September 2015}, journal = {Verbrennung und Feuerung, 27. Deutscher Flammentag, Clausthal-Zellerfeld, 16. und 17. September 2015}, publisher = {VDI-Verlag}, address = {D{\"u}sseldorf}, isbn = {978-3-18-092267-6}, pages = {17 -- 28}, 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} } @inproceedings{KrautzZiems, author = {Krautz, Hans Joachim and Ziems, Christian}, title = {Erneuerbare Energien - Chancen und Herausforderungen f{\"u}r neue Technologien in einer zuk{\"u}nftig nachhaltigen Energiewirtschaft}, language = {de} } @misc{KatzerSchierackTappeetal., author = {Katzer, Christian and Schierack, Frank and Tappe, Stephanie and Krautz, Hans Joachim}, title = {Ergebnisse der Untersuchungen zur Betriebsstabilit{\"a}t und des Emissionsverhaltens der TBK-Feuerung im Labor und an einem Großdampferzeuger}, series = {Kraftwerkstechnik 2017 : Strategien, Anlagentechnik und Betrieb}, journal = {Kraftwerkstechnik 2017 : Strategien, Anlagentechnik und Betrieb}, editor = {Beckmann, Michael}, publisher = {Saxonia Standortentwicklungs und -verwaltungsgesellschaft mbH}, address = {Freiberg}, isbn = {978-3-934409-79-8}, pages = {269 -- 278}, language = {de} } @misc{SakkasZiemsPosseltetal., author = {Sakkas, Nikolaos Panagiotis and Ziems, Christian and Posselt, Joachim and Krautz, Hans Joachim}, title = {Entwicklung von Algorithmen zur Einsatzplanung und Steuerung von Power-to-Heat-Anlagensystemen zur effizienteren Nutzung regenerativer {\"U}berschussenergie}, series = {VGB PowerTech}, volume = {98}, journal = {VGB PowerTech}, number = {8}, issn = {1435-3199}, pages = {82 -- 87}, language = {de} } @misc{ZiemsFischerKrautz, author = {Ziems, Christian and Fischer, Ulrich and Krautz, Hans Joachim}, title = {Entwicklung und anwendungsbezogene Charakterisierung von effizienten, hochleistungsf{\"a}higen 3D-Elektrodenmaterialien f{\"u}r die alkalische Druckelektrolysetechnologie}, series = {VGB PowerTech}, volume = {98}, journal = {VGB PowerTech}, number = {8}, issn = {1435-3199}, pages = {70 -- 74}, language = {de} } @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} } @phdthesis{Posselt, author = {Posselt, Joachim}, title = {Entwicklung eines Berechnungsmodells zur thermisch-geometrischen Dimensionierung eines Druck-Wirbelschicht-Verdampfungstrockners mit Tauchheizfl{\"a}chen am Beispiel polydisperser Braunkohle}, address = {Cottbus}, pages = {265}, abstract = {Im Rahmen dieser Arbeit wurde ein Berechnungsmodell zur thermisch-geometrischen Dimensionierung eines kontinuierlich arbeitenden Druck-Wirbelschicht-Verdampfungs-Trockners mit Tauchheizfl{\"a}chen f{\"u}r polydisperse Braunkohle erstellt. Zun{\"a}chst wurde auf Basis experimenteller Ergebnisse eine strukturell optimierte Grundgleichung zur Beschreibung des zeitlichen Feuchteverlaufes entwickelt. Dabei wurden die Besonderheiten des Trocknungsgutes (z.B. die Polydispersit{\"a}t und die Ausbildung einer Gleichgewichtsfeuchte) ber{\"u}cksichtigt. Mit Hilfe der f{\"u}r den Trockner aufgestellten Energiebilanzen wurde ein Modell zur Beschreibung des zeitlichen Verdampfungstrocknungsverlaufes entwickelt. Dabei wurde auch der Einfluss des Druckes in den Subgleichungen und Stoffwertberechnungen ber{\"u}cksichtigt. (Der {\"U}berdruck ist einer der Hauptunterschiede der DDWT zu zahlreichen anderen Trocknungsverfahren). Weiterf{\"u}hrend wurde unter Anwendung der Gleichungen zur Beschreibung der wirbelschicht-bedingten asymmetrischen Verweilzeitverteilung ein Gesamtmodell - das Trockner-Auslegungs-Modell (TRAM) - entwickelt und die Modellarchitektur detailliert beschrieben.}, language = {de} } @inproceedings{GuerreroKlattKrautz, author = {Guerrero, Cinthya and Klatt, Matthias and Krautz, Hans Joachim}, title = {Energy transition in Germany: a case study on renewable energy integration and its impact in the operation and efficiency of coal-fired power plants}, series = {Southern African Energy Efficiency Convention (SAEEC 2017), 14th and 15th November 2017, Gauteng, S{\"u}dafrika}, booktitle = {Southern African Energy Efficiency Convention (SAEEC 2017), 14th and 15th November 2017, Gauteng, S{\"u}dafrika}, isbn = {978-0-6399125-0-9}, pages = {6}, language = {en} } @incollection{SampangiRoentzsch, author = {Sampangi, Shiva Kumar and R{\"o}ntzsch, Lars}, title = {Electrolysis - Proton-exchange membrane electrolyzer | Proton exchange membrane water electrolysis: State-of-the-art technique and systems}, series = {Reference Module in Chemistry, Molecular Sciences and Chemical Engineering}, booktitle = {Reference Module in Chemistry, Molecular Sciences and Chemical Engineering}, editor = {Reedijk, Jan}, publisher = {Elsevier}, isbn = {978-0-12-409547-2}, doi = {10.1016/B978-0-323-96022-9.00237-1}, language = {en} } @misc{AkayBashkatovCoyetal., author = {Akay, {\"O}mer and Bashkatov, Aleksandr and Coy, Emerson and Eckert, Kerstin and Einarsrud, Kristian Etienne and Friedrich, Andreas and Kimmel, Benjamin and Loos, Stefan and Mutschke, Gerd and R{\"o}ntzsch, Lars and Symes, Mark D. and Yang, Xuegeng and Brinkert, Katharina}, title = {Electrolysis in reduced gravitational environments: current research perspectives and future applications}, series = {npj Microgravity}, volume = {8}, journal = {npj Microgravity}, issn = {2373-8065}, doi = {10.1038/s41526-022-00239-y}, abstract = {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.}, language = {en} } @inproceedings{KruegerNimtzFischeretal., author = {Kr{\"u}ger, Perco and Nimtz, Michael and Fischer, Ulrich and Krautz, Hans Joachim}, title = {Einsatzsimulation zur Erbringung von Prim{\"a}rregelleistung mit Batteriespeichern}, 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 = {95 -- 101}, language = {de} } @inproceedings{TannertZiemsTillmannetal., author = {Tannert, Daniel and Ziems, Christian and Tillmann, Christine and Krautz, Hans Joachim}, title = {Einrichtung und Erfahrungen aus der Inbetriebnahme einer fortschrittlichen alkalischen Druckelektrolyseanlage}, series = {19. Symposium - Nutzung regenerativer Energiequellen und Wasserstofftechnik, 8. - 10. November 2012 Stralsund}, booktitle = {19. Symposium - Nutzung regenerativer Energiequellen und Wasserstofftechnik, 8. - 10. November 2012 Stralsund}, publisher = {Fachhochschule}, address = {Stralsund}, isbn = {978-3-9813334-5-9}, language = {de} } @book{Swat, author = {Swat, Steffen}, title = {Einf{\"u}hrung in die Simulation von Kraftwerken mit EBSILON®Professional Version 15}, edition = {1. Auflage}, publisher = {Neopubli GmbH}, address = {Berlin}, isbn = {978-3-754142-04-2}, pages = {81}, abstract = {EBSILON®Professional ist ein leistungsf{\"a}higes Modellierungssystem, welches zur Simulation von thermodynamischen Kreisprozessen entwickelt wurde. Es eignet sich als Hilfsmittel bei der Anlagenplanung, -auslegung und -optimierung von thermischen Kraftwerken mit einem Wasserdampf-Prozess oder einem Gasturbinen-Prozess sowie Anlagen mit erneuerbaren Energien (Biomasse, Windenergie, Solarenergie und Geothermie). Die Einf{\"u}hrung beschreibt die Grundprinzipien und die Arbeitsschritte zur Erstellung eines Modells der Anlage. Weiterhin wird die Arbeit mit der internen Programmierungsumgebung EbsScript und der Umgang mit der Berechnung von Zeitreihen vorgestellt.}, language = {de} } @inproceedings{Loeffler, author = {L{\"o}ffler, Steffen}, title = {EBSILON im akademischen Einsatz an der BTU Cottbus}, language = {de} } @inproceedings{FischerVoigtTannertetal., author = {Fischer, Ulrich and Voigt, Andre and Tannert, Daniel and Krautz, Hans Joachim}, title = {Druckelektrolyse zur Wasserstoffherstellung- eine Kurz{\"u}bersicht zu energetischen Vor- und Nachteilen}, series = {Nutzung regenerativer Energiequellen und Wasserstofftechnik 2015, 22. Symposium Nutzung Regenerativer Energiequellen und Wasserstofftechnik, Stralsund, 5. - 7. November 2015}, booktitle = {Nutzung regenerativer Energiequellen und Wasserstofftechnik 2015, 22. Symposium Nutzung Regenerativer Energiequellen und Wasserstofftechnik, Stralsund, 5. - 7. November 2015}, publisher = {Fachhochschule Stralsund}, address = {Stralsund}, isbn = {978-3-9817740-0-9}, pages = {30 -- 36}, 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{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} } @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{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} } @inproceedings{LechnerMartinHoehneetal., author = {Lechner, Stefan and Martin, J{\"o}rg S. and H{\"o}hne, Olaf and Krautz, Hans Joachim}, title = {Druckaufgeladene Dampfwirbelschicht-Trocknung grubenfeuchter Braunkohlen - Forschungsergebnisse aus dem Betrieb einer Technikumsanlage an der BTU Cottbus}, 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{LechnerHoehneKrautz, author = {Lechner, Stefan and H{\"o}hne, Olaf and Krautz, Hans Joachim}, title = {Druckaufgeladene Dampfwirbelschicht-Trocknung (DDWT) von Braunkohlen: Bauliche Verfahrensoptimierungen an der BTU-Versuchsanlage und Ergebnisse}, language = {de} } @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} } @misc{KatzerSchierackKrautz, author = {Katzer, Christian and Schierack, Frank and Krautz, Hans Joachim}, title = {Die TBK- Feuerung im Labor und an einem Großdampfer-zeuger: Parallelen im Last- und Emissionsverhalten}, series = {Verbrennung und Feuerung, 28. Deutscher Flammentag, Darmstadt, 06. und 07. September 2017}, journal = {Verbrennung und Feuerung, 28. Deutscher Flammentag, Darmstadt, 06. und 07. September 2017}, publisher = {D{\"u}sseldorf}, address = {VDI-Verl.}, isbn = {978-3-18-092302-4}, pages = {39 -- 51}, abstract = {Mit der steigenden Erzeugung volatilen Stroms aus erneuerbaren Energien werden die Anforderungen an die Flexibilit{\"a}t der konventionellen Kraftwerke erh{\"o}ht. Der Einsatz von St{\"u}tzfeuerungssystemen auf Basis von Trockenbraunkohle (TBK) erm{\"o}glicht die Erweiterung des Lastbereiches und der Lastgradienten am Dampferzeuger. Untersuchungen zum Teillastverhalten von TBK-Brennern wurden an der BTU Cottbus - Senftenberg an einem 400 kWth Verbrennungsversuchstand und an dem industriellen 30 MWth TBK-Staubbrenner der Firma BBS (Babcock Borsig Steinm{\"u}ller GmbH) durchgef{\"u}hrt. Der verf{\"u}gbare Einsatzbereich des Brenners ist maßgeblich von der Intensit{\"a}t den brennernahen Mischungsvorgang abh{\"a}ngig. Mit der Absenkung der Brennerleistung ist beispielsweise eine signifikante Steigerung der NOx-Emission verbunden. Dieser Effekt ist auf die Ver{\"a}nderung des brennernahen Str{\"o}mungsprofiles zur{\"u}ckzuf{\"u}hren. Mit Maßnahmen wie der Erh{\"o}hung der Drallzahl, Verteilung der Luftimpulsstr{\"o}me und Ver{\"a}nderung des Prim{\"a}rimpulses konnte eine Stabilisierung und Intensivierung der Reaktionszone und somit eine Verbesserte des Teillastverhaltens nachgewiesen werden. 1.}, language = {de} } @inproceedings{ZiemsSakkasPosseltetal., author = {Ziems, Christian and Sakkas, Nikolaos Panagiotis and Posselt, Joachim and Krautz, Hans Joachim}, title = {Development of algorithms for the deployment planning and control of power-to-heat systems for the more efficient use of renewable surplus energy - project details}, series = {24. Energiesymposium Symposium - Nutzung regenerativer Energiequellen und Wasserstofftechnik}, booktitle = {24. Energiesymposium Symposium - Nutzung regenerativer Energiequellen und Wasserstofftechnik}, editor = {Luschtinetz, Thomas and Lehmann, Jochen}, publisher = {Stralsund}, address = {Hochschule, Inst. f{\"u}r Regenerative EnergieSysteme}, isbn = {978-3-9817740-3-0}, pages = {194 -- 211}, language = {en} } @misc{ReimannKohlenbachRoentzsch, author = {Reimann, Ansgar and Kohlenbach, Paul and R{\"o}ntzsch, Lars}, title = {Development of a novel quasi-2D PEM Electrolyzer Model in Modelica}, series = {Proceedings of the 15th International Modelica Conference 2023, Aachen, October 9-11}, journal = {Proceedings of the 15th International Modelica Conference 2023, Aachen, October 9-11}, publisher = {Link{\"o}ping University Electronic Press}, issn = {1650-3686}, doi = {10.3384/ecp20463}, pages = {9}, abstract = {To increase the efficiency of PEM electrolysis, simulation models are required that accurately describe the system's electrochemical and thermal behavior in a computationally efficient manner and are thus suitable for developing control strategies. Therefore, a pseudo-2D PEM electrolyzer model is presented in this paper, which is a compromise between the previously developed models regarding their model complexity. The electrochemical behavior is described with equations commonly used in the literature and the thermal behavior with correlations for gas-liquid heat transfer. Preliminary validation indicates that the model can describe the electrochemical behavior and thermal dynamics of a PEM electrolysis stack with good accuracy.}, language = {en} } @inproceedings{WieseNimtzMoelleretal., author = {Wiese, Bernd and Nimtz, Michael and M{\"o}ller, Fabian and Otto, Christopher and Liebscher, Axel and Schmidt-Hattenberger, Cornelia}, title = {Determination of thermodynamics in a CO2 injection well using pressure and distributed temperature sensing}, series = {Models - repositories of knowledge, proceedings of Model CARE2011 held in Leipzig, Germany, September 2011}, booktitle = {Models - repositories of knowledge, proceedings of Model CARE2011 held in Leipzig, Germany, September 2011}, publisher = {IAHS Publication}, address = {Wallingford}, isbn = {978-1-907161-34-6}, pages = {286 -- 290}, language = {en} } @misc{ThummarAbangMenzeletal., author = {Thummar, Krunalkumar and Abang, Roger and Menzel, Katharina and Groot, Matheus Theodorus de}, title = {Coupling a Chlor-Alkali Membrane Electrolyzer Cell to a Wind Energy Source: Dynamic Modeling and Simulations}, series = {Energies}, volume = {15}, journal = {Energies}, number = {2}, issn = {1996-1073}, doi = {10.3390/en15020606}, pages = {1 -- 26}, abstract = {Renewable energy sources are becoming a greater component of the electrical mix, while being significantly more volatile than conventional energy sources. As a result, net stability and availability pose significant challenges. Energy-intensive processes, such as chlor-alkali electrolysis, can potentially adjust their consumption to the available power, which is known as demand side management or demand response. In this study, a dynamic model of a chlor-alkali membrane cell is developed to assess the flexible potential of the membrane cell. Several improvements to previously published models were made, making the model more representative of state-of-the-art CA plants. By coupling the model with a wind power profile, the current and potential level over the course of a day was simulated. The simulation results show that the required ramp rates are within the regular operating possibilities of the plant for most of the time and that the electrolyte concentrations in the cell can be kept at the right level by varying inlet flows and concentrations. This means that a CA plant can indeed be flexibly operated in the future energy system.}, language = {en} } @inproceedings{AbangFindeisenKrautz, author = {Abang, Roger Atini and Findeisen, Alexander and Krautz, Hans Joachim}, title = {Corrosion Investigation of Materials under Oxyfuel Firing Conditions}, 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} } @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} } @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} } @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{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} } @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{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{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} }