Solids mixing and segregation in a circulating fluidized bed:
Gespeichert in:
| 1. Verfasser: | |
|---|---|
| Format: | Abschlussarbeit Buch |
| Sprache: | English |
| Veröffentlicht: |
Düsseldorf
VDI-Verl.
1997
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| Ausgabe: | Als Ms. gedr. |
| Schriftenreihe: | Verein Deutscher Ingenieure: [Fortschritt-Berichte VDI / 3]
489 |
| Schlagworte: | |
| Online-Zugang: | Inhaltsverzeichnis |
| Beschreibung: | XI, 90 S. Ill., graph. Darst. |
| ISBN: | 3183489031 |
Internformat
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Datensatz im Suchindex
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| adam_text | Titel: Solids mixing and segregation in a circulating fluidized bed
Autor: Hirschberg, Bernd
Jahr: 1997
FORTSCHRITTBERICHTE VM Dipl.-lng. Bernd Hirschberg, Hamburg Solids Mixing and Segregation in a Circulating Fluidized Bed Reihe 3: Verfahrenstechnik Nr. 489
Table of Content Nomenclature............................................................................................................ VII 1 Introduction 1 1.1 Circulating fluidized beds........................................................................................1 1.2 The significance of solids mixing and segregation in circulating fluidized bed applications........................................................................................4 13 Solids mixing and segregation - a state of the art review.........................................9 1.3.1 Experimental findings..........................................................................................9 1.3.2 Characterization of solids mixing and segregation states in fluidized beds...........12 1.3.3 Solids segregation in solids entrainment models.................................................15 1 4 Scope of the present work....................................................................................19 2 Experimental.........................................................................................................21 2 1 Experimental apparatus.........................................................................................21 2.2 Characterization of bed materials used..................................................................21 2.3 Measuring techniques...........................................................................................29 3 Experimental results 31 3.1 Non-steady state mixing experiments....................................................................31 3.2 Preliminary investigations with an iron ore/quartz sand I mixture..........................32 3.3 Axial segregation of an iron powder/quartz sand I mixture....................................35 3.4 Axial segregation of quartz sand II........................................................................37 3.5 Radial segregation of an
iron powder/quartz sand I mixture..................................37 4 The terminal velocity as the decisive parameter affecting solids segregation 42 4.1 Segregation intensity based on the terminal velocity..............................................44 4.2 Axial segregation in terms of local terminal velocity distributions..........................46 4.3 Comparison of segregation tendencies of both bed materials.................................47 5 Modeling of solids mixing and segregation in a circulating..................50 fluidized bed riser 50 5.1 Mechanisms of solids segregation and mixing........................................................50 5.2 Modeling..............................................................................................................51 V
5.3 Modeling of the upper dilute zone.........................................................................52 5.3.1 Overall flow structure in the upper dilute zone...................................................52 5.3.2 Solids motion within each phase of the upper dilute zone...................................54 5.3.3 Solids circulation in the upper dilute zone..........................................................56 5.3.4 Interfacial solids exchange.................................................................................57 5.3.5 Mass balances and boundary conditions.............................................................59 5.4 Bottom zone modeling..........................................................................................61 5.5 Exit zone modeling...............................................................................................61 5.6 Solving algorithm.................................................................................................62 6 Validation of the model 64 6.1 Model and input parameters.................................................................................64 6.1.1 Characterization of the bed material used...........................................................64 6.1.2 Axial solids volume concentration profdes.........................................................67 6.1.3 Solids volume concentration in the dense phase of the upper dilute zone.........................................................................................................69 6.1.4 The mass fraction of a given terminal-velocity fraction in the mass flux from the return leg into the bottom zone............................................69 6.2 Calculated axial mass fraction profiles of terminal-velocity fractions......................69 6.3 Comparison of calculated and measured local terminal-velocity distributions.........71 6.4 Comparison of calculated and
measured local mean particle sizes of quartz sand II..................................................................................................................74 6.5 Comparison of calculated and measured local iron powder fractions of iron powder/quartz sand I mixture................................................................................76 6.6 The coefficient of mass transfer between the dense and lean phases.......................78 6.7 The solids volume concentration in the dense phase of the upper dilute zone.........80 6.8 Summary of solids mixing and segregation model.................................................82 7 Summary and conclusions.................................................................................83 8 References................................................................. 85 VI
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| any_adam_object | 1 |
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| author_facet | Hirschberg, Bernd |
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| bvnumber | BV011431672 |
| classification_tum | CIT 385d |
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| discipline | Chemie-Ingenieurwesen |
| edition | Als Ms. gedr. |
| format | Thesis Book |
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| id | DE-604.BV011431672 |
| illustrated | Illustrated |
| indexdate | 2024-07-09T18:09:38Z |
| institution | BVB |
| isbn | 3183489031 |
| language | English |
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| physical | XI, 90 S. Ill., graph. Darst. |
| publishDate | 1997 |
| publishDateSearch | 1997 |
| publishDateSort | 1997 |
| publisher | VDI-Verl. |
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| series2 | Verein Deutscher Ingenieure: [Fortschritt-Berichte VDI / 3] |
| spelling | Hirschberg, Bernd Verfasser aut Solids mixing and segregation in a circulating fluidized bed Bernd Hirschberg Als Ms. gedr. Düsseldorf VDI-Verl. 1997 XI, 90 S. Ill., graph. Darst. txt rdacontent n rdamedia nc rdacarrier Verein Deutscher Ingenieure: [Fortschritt-Berichte VDI / 3] 489 Zugl.: Hamburg-Harburg, Techn. Univ., Diss., 1997 Wirbelschichtreaktor (DE-588)4127165-8 gnd rswk-swf Zirkulierende Wirbelschicht (DE-588)4190966-5 gnd rswk-swf Gas-Feststoff-Strömung (DE-588)4156012-7 gnd rswk-swf Stoffübertragung (DE-588)4057696-6 gnd rswk-swf Strömungsgeschwindigkeit (DE-588)4134993-3 gnd rswk-swf (DE-588)4113937-9 Hochschulschrift gnd-content Wirbelschichtreaktor (DE-588)4127165-8 s Zirkulierende Wirbelschicht (DE-588)4190966-5 s Gas-Feststoff-Strömung (DE-588)4156012-7 s Strömungsgeschwindigkeit (DE-588)4134993-3 s Stoffübertragung (DE-588)4057696-6 s DE-604 3] Verein Deutscher Ingenieure: [Fortschritt-Berichte VDI 489 (DE-604)BV001897067 489 HBZ Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=007687362&sequence=000001&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Hirschberg, Bernd Solids mixing and segregation in a circulating fluidized bed Wirbelschichtreaktor (DE-588)4127165-8 gnd Zirkulierende Wirbelschicht (DE-588)4190966-5 gnd Gas-Feststoff-Strömung (DE-588)4156012-7 gnd Stoffübertragung (DE-588)4057696-6 gnd Strömungsgeschwindigkeit (DE-588)4134993-3 gnd |
| subject_GND | (DE-588)4127165-8 (DE-588)4190966-5 (DE-588)4156012-7 (DE-588)4057696-6 (DE-588)4134993-3 (DE-588)4113937-9 |
| title | Solids mixing and segregation in a circulating fluidized bed |
| title_auth | Solids mixing and segregation in a circulating fluidized bed |
| title_exact_search | Solids mixing and segregation in a circulating fluidized bed |
| title_full | Solids mixing and segregation in a circulating fluidized bed Bernd Hirschberg |
| title_fullStr | Solids mixing and segregation in a circulating fluidized bed Bernd Hirschberg |
| title_full_unstemmed | Solids mixing and segregation in a circulating fluidized bed Bernd Hirschberg |
| title_short | Solids mixing and segregation in a circulating fluidized bed |
| title_sort | solids mixing and segregation in a circulating fluidized bed |
| topic | Wirbelschichtreaktor (DE-588)4127165-8 gnd Zirkulierende Wirbelschicht (DE-588)4190966-5 gnd Gas-Feststoff-Strömung (DE-588)4156012-7 gnd Stoffübertragung (DE-588)4057696-6 gnd Strömungsgeschwindigkeit (DE-588)4134993-3 gnd |
| topic_facet | Wirbelschichtreaktor Zirkulierende Wirbelschicht Gas-Feststoff-Strömung Stoffübertragung Strömungsgeschwindigkeit Hochschulschrift |
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