TY - CHAP A1 - Ziems, Christian A1 - Tannert, Daniel A1 - Krautz, Hans Joachim T1 - Grundlagenforschung zur Optimierung des alkalischen Druckelektrolyseprozesses am 25 bar Einzel-Zell-Versuchsstand - Projektvorstellung T2 - 19. Symposium - Nutzung regenerativer Energiequellen und Wasserstofftechnik, 8. - 10. November 2012 Stralsund Y1 - 2012 SN - 978-3-9813334-5-9 PB - Fachhochschule CY - Stralsund ER - TY - CHAP A1 - Ziems, Christian A1 - Krautz, Hans Joachim T1 - Grid integration of renewable energies and hydrogen research at BTU Cottbus T2 - Dena Konferenz "Power to Gas - innovative Systemlösungen für ein zukunftsfähiges Energiesystem entwickeln", Berlin, 2012 Y1 - 2012 ER - TY - CHAP A1 - Krautz, Hans Joachim A1 - Guerrero Amezcua, Cinthya Larissa A1 - Ziems, Christian T1 - 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 T2 - SASEC 2015, Third Southern African Solar Energy Conference, 11 – 13 May 2015, Kruger National Park, South Africa Y1 - 2015 UR - http://hdl.handle.net/2263/49472 SP - 383 EP - 388 ER - TY - GEN A1 - Krautz, Hans Joachim A1 - Nimtz, Michael T1 - Flexible Operation of CCS Power Plants to Match Variable Renewable Energies T2 - Energy Procedia N2 - 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. KW - CCS; Flexibility; Post combustion capture; Oxyfuel; Solvent storage; Pipeline Y1 - 2013 U6 - https://doi.org/10.1016/j.egypro.2013.08.034 SN - 1876-6102 VL - 2013 IS - 40 SP - 294 EP - 303 ER - TY - GEN A1 - Krautz, Hans Joachim A1 - Corrêa da Silva, Rodrigo A1 - Kangwanpongpan, Tanin T1 - Flame pattern, temperatures and stability limits of pulverized oxy-coal combustion T2 - Fuel : the science and technology of fuel and energy N2 - 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. KW - Oxy-fuel; Pulverized coal combustion; Flame pattern; Stability limits Y1 - 2014 U6 - https://doi.org/10.1016/j.fuel.2013.07.049 SN - 0016-2361 IS - Vol. 115 SP - 507 EP - 520 ER - TY - CHAP A1 - Ziems, Christian A1 - Tannert, Daniel A1 - Krautz, Hans Joachim T1 - First modeling results of an advanced pressurized alkaline electrolyzer for hydrogen production T2 - 19. World Hydrogen Energy Conference, Toronto, 2012 Y1 - 2012 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 - 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 - CHAP A1 - Katzer, Christian A1 - Klatt, Matthias A1 - Lisk, Alexander A1 - Krautz, Hans Joachim T1 - Experimentelle Untersuchungen zur Entwicklung eines elektrisch zündenden Kohlestaubbrenners T2 - Kraftwerkstechnik 2015, Strategien, Anlagentechnik und Betrieb, Beiträge des 47. Kraftwerkstechnischen Kolloquiums vom 13. und 14. Oktober 2015 in Dresden Y1 - 2015 SN - 978-3-934409-70-5 SP - 279 EP - 288 PB - SAXONIA CY - Freiberg ER - TY - GEN A1 - Katzer, Christian A1 - Klatt, Matthias A1 - Lisk, Alexander A1 - Krautz, Hans Joachim T1 - Erste Untersuchungsergebnisse an einem elektrisch zündenden Kohlenstaubbrennersystem T2 - Verbrennung und Feuerung, 27. Deutscher Flammentag, Clausthal-Zellerfeld, 16. und 17. September 2015 Y1 - 2015 SN - 978-3-18-092267-6 SP - 17 EP - 28 PB - VDI-Verlag CY - Düsseldorf ER -