Estimation of pressure drop and circulation rate

In this study, pressure drop across a novel CFB riser integrated with an enlarged bottom section was investigated under various operating conditions. Experimental results indicated that total pressure drop was much higher across the riser with larger diameter-enlarged section dimensions, consequently, resulting in lower solids circulation rate realizable in the riser. Based on the measured pressure drop across this novel riser, apparent solids concentrations of the diameter-enlarged section and the conveying section were obtained. Furthermore, empirical correlations for estimating overall average solids concentration in these two sections were established, respectively. And a satisfactory agreement between predictions and experimental results was observed.

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OPERATIONAL INFLUENCE OF THE MONO-CHAMBER AERATION MODE IN THE LOOP SEAL OF A CIRCULATING FLUIDIZED BED

Latin American Applied Research - An international journal ◽

10.52292/j.laar.2021.181 ◽

2020 ◽

Vol 51 (1) ◽

pp. 15-20

Author(s):

Fernanda De Oliveira ◽

Guilherme Santos Furquim ◽

Vitor Otávio Ochoski Machado ◽

Maria Regina Parise ◽

Jhon Jairo Ramírez Behainne

Keyword(s):

Pressure Drop ◽

Fluidized Bed ◽

Energy Demand ◽

Static Pressure ◽

Circulating Fluidized Bed ◽

Circulation Rate ◽

Sauter Mean Diameter ◽

Solids Circulation Rate ◽

Fluidization Regime ◽

Superficial Gas Velocity

Fluidization numbers varying from 0.84 to 1.68 were used in the loop seal valve of a bench-scale circulating fluidized bed (CFB) system to analyze the influence of the mono-chamber aeration mode on both the solids circulation rate and the static pressure drop inside the solids recycle device. Runs were carried out using 4 kg of overall solids inventory and particles of 183 µm in Sauter mean diameter, which were kept under fast fluidization regime at superficial gas velocity of 4 m/s. Results showed that the choice of the chamber to be aerated can noticeably affect the gas-solid hydrodynamics. In this sense, the analysis of variance applied on the experimental data indicated that the aeration into the recycle chamber of the loop seal offers lower levels of solids circulation rate but also allows to control it within a wider range of fluidization numbers and with less pressure drop or energy demand.

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