TY - GEN A1 - Höhne, Olaf A1 - Lechner, Stefan A1 - Schreiber, Matthias A1 - Krautz, Hans Joachim T1 - Drying of Lignite in a Pressurized Steam Fluidized Bed - Theory and Experiments Y1 - 2010 ER - 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 - CHAP A1 - Lechner, Stefan A1 - Höhne, Olaf A1 - Krautz, Hans Joachim T1 - Druckaufgeladene Dampfwirbelschichttrocknung (DDWT) von Braunkohlen: Verfahrensoptimierung mittels Feinkorntrocknung Y1 - 2008 ER - TY - CHAP A1 - Lechner, Stefan A1 - Höhne, Olaf A1 - Krautz, Hans Joachim T1 - Pressurized steam fluidized bed drying (PSFBD) of lignite: constructional and process optimization at the BTU test facility and experimental results Y1 - 2009 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 - THES A1 - Lechner, Stefan T1 - Untersuchungen zur Berechnung und Optimierung des Wärmeübergangs bei der Dampfwirbelschicht-Trocknung am Beispiel von Lausitzer Braunkohlen Y1 - 2012 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:co1-opus-27120 UR - http://opus.kobv.de/btu/volltexte/2012/2712/ 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 - Lechner, Stefan A1 - Martin, Jörg S. A1 - Höhne, Olaf A1 - Krautz, Hans Joachim T1 - Druckaufgeladene Dampfwirbelschicht-Trocknung grubenfeuchter Braunkohlen - Forschungsergebnisse aus dem Betrieb einer Technikumsanlage an der BTU Cottbus Y1 - 2007 ER - TY - CHAP A1 - Martin, Jörg S. A1 - Höhne, Olaf A1 - Lechner, Stefan A1 - Krautz, Hans Joachim A1 - Jentsch, N. T1 - Druckaufgeladene Dampfwirbelschicht-Trocknung (DDWT) von Braunkohlen: Von den Betriebsergebnissen des Versuchstrockners (0,5 t/h) zur Konzeptentwicklung der Großtechnischen Versuchsanlage (GTVA, 70 t/h) Y1 - 2007 ER - TY - CHAP A1 - Lechner, Stefan A1 - Rombrecht, Hans-Bernd A1 - Krautz, Hans Joachim T1 - Pressurized Steam Fluidized Bed Drying (PSFBD) and Carbon Dioxide Separation by Flue Gas Scrubbing - New Challenges for the Lignite Power Industry Y1 - 2011 ER - TY - CHAP A1 - Lechner, Stefan A1 - Höhne, Olaf A1 - Krautz, Hans Joachim T1 - Druckaufgeladene Dampfwirbelschicht-Trocknung (DDWT) von Braunkohlen: Bauliche Verfahrensoptimierungen an der BTU-Versuchsanlage und Ergebnisse Y1 - 2009 ER -