TY - CHAP A1 - Merzsch, Matthias A1 - Silbermann, Rico A1 - Lechner, Stefan A1 - Krautz, Hans Joachim T1 - Druckaufgeladene Dampfwirbelschicht-Trocknung (DDWT) von Braunkohlen: Neuste Betriebsergebnisse von der BTU-Versuchsanlage Y1 - 2010 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 - Merzsch, Matthias A1 - Posselt, Joachim A1 - Wiedemann, Philipp A1 - Lechner, Stefan A1 - Krautz, Hans Joachim T1 - Druckaufgeladene Dampfwirbelschicht-Trocknung (DDWT) von Braunkohlen: Grundlagenuntersuchungen zur verfahrenstechnischen Optimierung der Dampfwirbelschicht-Trocknung von Braunkohlen T2 - Kraftwerkstechnik, Bd. 4, 44. Kraftwerkstechnisches Kolloquium, Dresden Y1 - 2012 SN - 978-3-935317-87-0 SP - 923 EP - 934 PB - TK-Verlag CY - Nietwerder ER - TY - GEN A1 - Merzsch, Matthias A1 - Lechner, Stefan A1 - Krautz, Hans Joachim T1 - Heat-transfer from single horizontal tubes in fluidized beds: Influence of tube diameter, moisture and diameter-definition by Geldart C fines content T2 - Powder Technology Y1 - 2012 U6 - https://doi.org/10.1016/j.powtec.2012.12.002 SN - 1873-328X ER - TY - GEN A1 - Lechner, Stefan A1 - Merzsch, Matthias A1 - Krautz, Hans Joachim T1 - Heat-transfer from horizontal tube bundles into fluidized beds with Geldart A lignite particles T2 - Powder Technology N2 - This work investigates the heat transfer mechanism in fluidized beds equipped with horizontal heat exchanger surfaces such as single tubes and especially tube bundles. Previous works were performed for varying operating conditions and solids' material properties, leading to a heterogeneous and therefore not applicable spectrum of derived correlations for the influence of tube diameter and tube bundle geometry on heat transfer. Based on a wide range validation of the correlation for the influence of single tube diameter on heat transfer coefficient, tube bundles with different tube diameters and horizontal and vertical spacings and alignments were investigated. Experiments were carried out using electrical heat transfer probes in a 0.15 m2 fluidized bed test facility at ambient conditions. Geldart A lignite and Geldart D solids were used in order to distinguish between predominant particle-convective and gas-convective heat transfer mechanisms. The tube bundle reduction factor on heat transfer coefficient was derived as a key parameter based on dimensionless geometric numbers. This factor predicts the reduction of the heat transfer coefficient compared to that of the single tube due to the particle and gas flow disturbances caused by the immersed tubes. Tube diameter as well as tube bundle geometry were successfully implemented into useful correlations for predicting tube bundles' heat transfer of gas–solid fluidized bed systems operating with fine particles. KW - Fluidized bed KW - Lignite KW - Drying KW - Heat transfer KW - Horizontal tubes KW - Tube bundle Y1 - 2014 U6 - https://doi.org/10.1016/j.powtec.2013.10.041 IS - 253 SP - 14 EP - 21 ER - TY - CHAP A1 - Merzsch, Matthias A1 - Posselt, Joachim A1 - Wiedemann, Philipp A1 - Krautz, Hans Joachim ED - Schulz, Detlef T1 - Druckaufgeladene Dampfwirbelschicht-Trocknung von Braunkohle T2 - Nachhaltige Energieversorgung und Integration von Speichern, Tagungsband zur NEIS 2015 Y1 - 2015 SN - 978-3-658-10957-8 SP - 160 EP - 165 PB - Springer CY - Wiesbaden ER - TY - GEN A1 - Merzsch, Matthias T1 - Druckaufgeladene Dampfwirbelschicht-Trocknung von Braunkohle – Eine kleine Reise durch die Geschichte der Trocknung speziell die der Braunkohlen T2 - VGB PowerTech N2 - 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. KW - Braunkohle KW - Trocknung KW - Wirbelschicht Y1 - 2018 SN - 1435-3199 VL - 98 IS - 8 SP - 49 EP - 57 ER - TY - CHAP A1 - Merzsch, Matthias A1 - Wiedemann, Philipp A1 - Posselt, Joachim A1 - Krautz, Hans Joachim T1 - Druckaufgeladene Dampfwirbelschicht-Trocknung (DDWT) von Braunkohlen T2 - 45. Kraftwerkstechnisches Kolloquium, Dresden, Oktober 2013 Y1 - 2013 SN - 978-3-944310-04-6 PB - TK-Verl. CY - Neuruppin ER - TY - CHAP A1 - Rombrecht, Hans-Bernd A1 - Merzsch, Matthias A1 - Krautz, Hans Joachim T1 - Die Druckaufgeladene Dampfwirbelschicht-Trocknung (DDWT) und die Kohlendioxidabtrennung mittels Gaswäsche Y1 - 2011 ER -