Characterization of the flow patterns in a pressurized circulating fluidized bed

Richtberg, M.; Richter, R.H.; Wirth, Karl‐Ernst

doi:10.1016/j.powtec.2005.05.034

Cited by 38 publications

(9 citation statements)

References 4 publications

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“…In addition, a much straighter curve of pressure drop along the riser could be detected with an increase of operating pressure, indicating a slightly more uniform longitudinal solids distribution at higher operating pressures. The same trend also shows up in the results of Richtberg et al (2005) for dilute gas-solids suspension in a pressurized CFB. By comparing the pressure drop profiles of the riser at different operating pressures, Richtberg et al (2005) found a straighter curve of pressure drop profile at higher static pressures.…”

Section: Gas-solid Flow Behavior In a Hfcfb Riser 355supporting

confidence: 73%

“…The same trend also shows up in the results of Richtberg et al (2005) for dilute gas-solids suspension in a pressurized CFB. By comparing the pressure drop profiles of the riser at different operating pressures, Richtberg et al (2005) found a straighter curve of pressure drop profile at higher static pressures.…”

Section: Gas-solid Flow Behavior In a Hfcfb Riser 355supporting

confidence: 73%

“…Experimental achievements under atmospheric conditions are difficult to extrapolate to those types of reaction systems conducted at elevated pressure (Richtberg et al, 2005). For example, there is the question of how increased pressure affects the flow behavior in the riser and subsequently the performance of industrial processes.…”

Section: Introductionmentioning

confidence: 99%

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Gas-Solid Flow Behavior in a Pressurized High-Flux Circulating Fluidized Bed Riser

Yin

Jin

Zhong

et al. 2013

Chemical Engineering Communications

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Gas-solid flow behavior was investigated in a high-flux circulating fluidized bed (HFCFB), whose riser is 0.068 m ID and 5.2 m high. Experiments were carried out at different pressures (0.1-0.5 MPa), solids mass fluxes (122-1015 kg=m 2 Á s), and standard state superficial gas velocities (6-40 m=s). Geldart group B particles 137 mm in diameter and 2490 kg=m 3 in density were used as bed materials. Information on pressure drop, apparent solids holdup, average slip velocity, and solid-toair mass flow ratio were systematically tested at elevated pressures. The results showed that increase of the operating pressure led to higher total riser pressure drop and solids holdup, lower slip velocity, more homogeneous pressure drop, and longitudinal solids holdup distribution. As a result, a high-density condition with Geldart group B particles, i.e., solids holdup in the riser over 10%, could be successfully formed in the HFCFB at elevated pressure. Similar to the trend at atmosphere, the dimensionless slip velocity at pressurized condition increased with increasing solids holdup for any given superficial gas velocity, and the total riser pressure drop increased approximately linearly with solids-to-air mass flow ratio at the given operating pressure.

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Section: Gas-solid Flow Behavior In a Hfcfb Riser 355supporting

confidence: 73%

Section: Gas-solid Flow Behavior In a Hfcfb Riser 355supporting

confidence: 73%

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Gas-Solid Flow Behavior in a Pressurized High-Flux Circulating Fluidized Bed Riser

Yin

Jin

Zhong

et al. 2013

Chemical Engineering Communications

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“…Also it is found that the pressure drop gradually increases with the riser bed height. Similar observations were found by Richtberg et al [30]. They observed an exponentially increasing trend at higher pressure (0.50 MPa) for bed pressure drop with glass beads.…”

Section: Effect Of Operating Pressure On Pressure Dropsupporting

confidence: 89%

Hydrodynamic experiments on a small-scale circulating fluidized bed reactor at elevated operating pressure, and under an O2/CO2 environment

et al. 2017

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Pressurized circulating fluidized bed technology is a potentially promising development for clean coal technologies. The current work explores the hydrodynamics of a small-scale circulating fluidized bed at elevated operating pressures ranging from 0.10 to 0.25 MPa. The initial experiments were performed at atmospheric pressure with air and O 2 /CO 2 environments as the fluidization gas to simulate the hydrodynamics in a circulating fluidized bed. A comparison between the effects of air and O 2 /CO 2 mixtures on the hydrodynamics was outlined in this paper for particles of 160 μm diameter. A small but distinct effect on axial voidage was observed due to the change in gas density in the dense zone of the bed at lower gas velocity, while only minimal differences were noticed at higher gas velocities. The hydrodynamic parameters such as pressure drop and axial voidage profile along the height were reported at two different bed inventories (0.5 and 0.75 kg) for three mean particle sizes of 160, 302, and 427 μm and three superficial gas velocities. It was observed that the operating pressure had a significant effect on the hydrodynamic parameters of bed pressure drop and axial bed voidage profiles. The effect of solids loading resulted in an exponential change in pressure drop profile at atmospheric pressure as well as at elevated pressure. The experimental results on hydrodynamic parameters are in reasonable agreement with published observations in the literature.

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“…Each probe is constructed in the same way (Richtberg et al, 2005) and composed of three coaxial stainless steel electrodes as shown in Figure 2.…”

Section: Capacitance Probe Measurement Systemmentioning

confidence: 99%

Experimental characterization of the flow pattern in an annular fluidized bed

Collin

Wirth

Ströder³

2008

Can J Chem Eng

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The annular fluidized bed combines a long solids residence time and a good heat and mass transfer. To experimentally characterize the flow pattern in the system, pressure drop and capacitance probe measurements have been carried out under ambient conditions in two plants of inner diameters of 0.19 and 0.74 m. Depending on the interaction between gas velocity in the central jet and ratio of bubble to central nozzle diameter, the ratio of internal to external solids circulation can be regulated.

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Characterization of the flow patterns in a pressurized circulating fluidized bed

Cited by 38 publications

References 4 publications

Gas-Solid Flow Behavior in a Pressurized High-Flux Circulating Fluidized Bed Riser

Gas-Solid Flow Behavior in a Pressurized High-Flux Circulating Fluidized Bed Riser

Hydrodynamic experiments on a small-scale circulating fluidized bed reactor at elevated operating pressure, and under an O2/CO2 environment

Experimental characterization of the flow pattern in an annular fluidized bed

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