@misc{HoehneLechnerSchreiberetal., author = {H{\"o}hne, Olaf and Lechner, Stefan and Schreiber, Matthias and Krautz, Hans Joachim}, title = {Drying of Lignite in a Pressurized Steam Fluidized Bed - Theory and Experiments}, language = {en} } @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{LechnerHoehneKrautz, author = {Lechner, Stefan and H{\"o}hne, Olaf and Krautz, Hans Joachim}, title = {Druckaufgeladene Dampfwirbelschichttrocknung (DDWT) von Braunkohlen: Verfahrensoptimierung mittels Feinkorntrocknung}, language = {de} } @inproceedings{LechnerHoehneKrautz, author = {Lechner, Stefan and H{\"o}hne, Olaf and Krautz, Hans Joachim}, title = {Pressurized steam fluidized bed drying (PSFBD) of lignite: constructional and process optimization at the BTU test facility and experimental results}, language = {en} } @misc{AsegehegnLechnerMerzschetal., author = {Asegehegn, Teklay Weldeabzgi and Lechner, Stefan and Merzsch, Matthias and Schreiber, Matthias and Silbermann, Rico and Krautz, Hans Joachim and H{\"o}hne, Olaf}, title = {Das DDWT-Verfahren als Schl{\"u}sseltechnologie zuk{\"u}nftiger Braunkohlekraftwerke}, 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} } @misc{MerzschLechnerKrautz, author = {Merzsch, Matthias and Lechner, Stefan and Krautz, Hans Joachim}, title = {Heat-transfer from single horizontal tubes in fluidized beds: Influence of tube diameter, moisture and diameter-definition by Geldart C fines content}, series = {Powder Technology}, journal = {Powder Technology}, issn = {1873-328X}, doi = {10.1016/j.powtec.2012.12.002}, language = {en} } @phdthesis{Lechner, author = {Lechner, Stefan}, title = {Untersuchungen zur Berechnung und Optimierung des W{\"a}rme{\"u}bergangs bei der Dampfwirbelschicht-Trocknung am Beispiel von Lausitzer Braunkohlen}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:co1-opus-27120}, language = {de} } @misc{LechnerMerzschKrautz, author = {Lechner, Stefan and Merzsch, Matthias and Krautz, Hans Joachim}, title = {Heat-transfer from horizontal tube bundles into fluidized beds with Geldart A lignite particles}, series = {Powder Technology}, journal = {Powder Technology}, number = {253}, doi = {10.1016/j.powtec.2013.10.041}, pages = {14 -- 21}, abstract = {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.}, language = {en} } @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{MartinHoehneLechneretal., author = {Martin, J{\"o}rg S. and H{\"o}hne, Olaf and Lechner, Stefan and Krautz, Hans Joachim and Jentsch, N.}, title = {Druckaufgeladene Dampfwirbelschicht-Trocknung (DDWT) von Braunkohlen: Von den Betriebsergebnissen des Versuchstrockners (0,5 t/h) zur Konzeptentwicklung der Großtechnischen Versuchsanlage (GTVA, 70 t/h)}, language = {de} } @inproceedings{LechnerRombrechtKrautz, author = {Lechner, Stefan and Rombrecht, Hans-Bernd and Krautz, Hans Joachim}, title = {Pressurized Steam Fluidized Bed Drying (PSFBD) and Carbon Dioxide Separation by Flue Gas Scrubbing - New Challenges for the Lignite Power Industry}, 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} }