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Optimal placement o...
Optimal placement of probes for dynamic pressure measurements in large-scale fluidized beds
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- van Ommen, J.R. (författare)
- Technische Universiteit Delft,Delft University of Technology (TU Delft)
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- van der Schaaf, J. (författare)
- Technische Universiteit Eindhoven,Eindhoven University of Technology
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- Schouten, J.C. (författare)
- Technische Universiteit Eindhoven,Eindhoven University of Technology
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- van Wachem, Berend, 1972 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Coppens, M.O. (författare)
- Technische Universiteit Delft,Delft University of Technology (TU Delft)
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- van den Bleek, C.M. (författare)
- Technische Universiteit Delft,Delft University of Technology (TU Delft)
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(creator_code:org_t)
- Elsevier BV, 2004
- 2004
- Engelska.
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Ingår i: Powder Technology. - : Elsevier BV. - 1873-328X .- 0032-5910. ; 139:3, s. 264-276
- Relaterad länk:
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http://dx.doi.org/10...
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https://doi.org/10.1...
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https://research.cha...
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Abstract
Ämnesord
Stäng
- Pressure data sampled at sufficiently high frequency (typically 20 Hz or higher) can yield much information about the hydrodynamic state of a fluidized bed. Since part of the pressure waves travelling through large (industrial) fluidized beds is only detectable in a limited area of the bed, pressure measurements need to be performed at several positions to cover the whole bed. We examine these local pressure waves (caused by, e.g., passing bubbles or coalescing bubbles) in a 0.80 m i.d. bubbling fluidized bed of Geldart B particles. Experiments and simulations are performed to determine the intensity decrease as local pressure waves propagate from their origin. A new spectral method is applied to determine the degree of coherence for pressure signals measured at two different positions in a fluidized bed. For a superficial gas velocity of 5u(mf), local pressure waves can be detected up to a radial distance of about 0.5 m from their origin; this distance is somewhat lower for lower gas velocities. This means that the radial spacing of pressure probes should not exceed 1 m. For large diameter beds with a bed height below 1.5 m, a set of probes at a single level and at several radial positions is sufficient to observe or monitor the dynamic state of the complete bed; the probes should preferably be placed at a height of 30% to 40% of the total bed height.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Nyckelord
- industrial installations
- monitoring
- pressure measurements
- gas-solid fluidized beds
- pressure probe spacing
- pressure fluctuations
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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