Research Papers: Energy Systems Analysis

Analysis of a Vortexing Circulating Fluidized Bed for Process Intensification Via High-G Flows

[+] Author and Article Information
Michael Bobek, Steve Rowan, Jingsi Yang

National Energy Technology Laboratory,
Morgantown, WV 26507;
Department of Thermal Science,
Oak Ridge Institute for Science and Education,
Morgantown, WV 26507

Justin Weber, Frank Shafer, Ronald W. Breault

National Energy Technology Laboratory,
Morgantown, WV 26507

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received September 19, 2017; final manuscript received January 3, 2018; published online March 29, 2018. Editor: Hameed Metghalchi.The United States Government retains, and by accepting the article for publication, the publisher acknowledges that the United States Government retains, a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this work, or allow others to do so, for United States government purposes.

J. Energy Resour. Technol 140(6), 062003 (Mar 29, 2018) (10 pages) Paper No: JERT-17-1500; doi: 10.1115/1.4039545 History: Received September 19, 2017; Revised January 03, 2018

Fluidized beds are used in many industries where gas–solid reactions are present for their favorable characteristics of good solids mixing, high heat, and mass transfer rates, and large throughputs. In an attempt to increase throughput, reduce reactor footprints, and reduce costs, process intensification by unconventional reactor designs is being pursued. Specifically, this work focuses on the development of high-G reactors where the particles are experiencing a centripetal force typically on the order of ten times the force of gravity. This operating regime provides intensified gas–solids contact providing higher mass transfer, heat transfer, and gas throughput than a typical fluidized bed. This work focuses analysis of a cold flow vortexing circulating fluidized bed (CFB). Through mapping the pressure distributions in the riser, insights into the behavior of the system were made and compared to CPFD Barracuda computational fluid dynamic models. The simulation results outlined the working envelope of the system and provided a baseline to compare the experimental results. The experimental pressure data determined angular velocities of the gas in the range of 30–40 m/s, with corresponding particle velocities around 15 m/s.

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Fig. 4

Comparison of grid sizing

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Fig. 5

Mesh and computational particle comparison

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Fig. 3

Total mass in riser during simulation

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Fig. 2

Case 1 at various entrance conditions

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Fig. 1

Experimental riser

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Fig. 6

Effect of entrance condition on radial pressure difference

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Fig. 7

Radial pressure profile (80 m/s)

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Fig. 8

Effect of entrance condition on axial pressure difference

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Fig. 9

Axial pressure profile (80 m/s)

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Fig. 10

Radial pressure profile for the 68.7 m/s entrance condition

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Fig. 11

radial pressure profile for the 76 m/s entrance condition

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Fig. 12

Radial pressure profile for the 83 m/s entrance condition

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Fig. 13

Radial gas velocity profile for the 68.7 m/s LPM entrance condition

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Fig. 14

Radial velocity profile for the 76 m/s entrance condition

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Fig. 15

Velocity profile for 83 m/s entrance condition

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Fig. 16

High speed video particle tracking

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Fig. 17

Horizontal recirculation section of experimental setup

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Fig. 18

Axial pressure profile comparison for 80 m/s entrance condition

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Fig. 19

Simulation radial pressure drop and velocity for 70 m/s

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Fig. 20

Radial velocity comparison for 70 m/s entrance condition



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