Pressure Fluctuations in a Gas-Solid Fluidized Bed

0309191 - ÚCHP 2009 RIV SK eng C - Konferenční příspěvek (zahraniční konf.)
Hartman, Miloslav - Trnka, Otakar - Svoboda, Karel
Pressure Fluctuations in a Gas-Solid Fluidized Bed.
[Fluktuace tlaku ve vrstvě zrnitého materiálu fluidované plynem.]
Proceedings. Bratislava: Slovak Society of Chemical Engineering, 2008 - (Markoš, J.), s. 140. ISBN 978-80-227-2903-1.
[35th International Conference of Slovak Society of Chemical Engineering. Tatranské Matliare (SK), 26.05.2008-30.05.2008]
Grant CEP: GA AV ČR IAA400720701
Výzkumný záměr: CEZ:AV0Z40720504
Klíčová slova: fluidized beds * fluidization regimes * pressure fluctuations
Kód oboru RIV: CI - Průmyslová chemie a chemické inženýrství

An analysis method is developed and applied which employs spectra of the Fast Fourier Transform of measured pressure fluctuations within the fluidized bed. The procedure is based upon the spectral analysis of successive time series of pressure fluctuations reflecting the actual hydrodynamic state of the bed. Practical application of the method is illustrated for fluidization at ambient temperature and pressure of spherical particles (glass beads) as well as irregularly shaped particles (limestone, sulfated limestone, and dried sewage sludge), in an 8-cm – ID fluidized bed. Using air, experiments were conducted with different fractions of the materials spanning a very wide range of 0.28 – 4.5 mm. The evolution was explored of bed behavior from the onset of fluidization to pneumatic transport (elutriation) of solids from the bed. The method recognizes alterations of the hydrodynamic state of the bed caused by minor changes in the bed mass and/or in the granularity of the bed material

Navržená a ověřená metoda využívající fluidační charakteristiky umožňuje určovat hydrodynamicý režim fluidní vrstvy. Jednotlivé stavy vrstvy jsou objektivně definovány a vymezeny na základě úseků fluktuačních křivek.
Trvalý link: http://hdl.handle.net/11104/0161403