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Research Papers: Energy Systems Analysis

Development of a Spouted Bed Reactor for Chemical Looping Combustion

[+] Author and Article Information
Johannes George van der Watt

Institute for Energy Studies,
University of North Dakota,
2844 Campus Road, Stop 8153,
Grand Forks, ND 58202-8153
e-mail: johannes.vanderwatt@und.edu

Daniel Laudal

Institute for Energy Studies,
University of North Dakota,
Studies 2844 Campus Road, Stop 8153,
Grand Forks, ND 58202-8153
e-mail: daniel.laudal@engr.und.edu

Gautham Krishnamoorthy

Department of Chemical Engineering,
University of North Dakota,
241 Centennial Drive,
Grand Forks, ND 58202-7101
e-mail: gautham.krishnamoorthy@engr.und.edu

Harry Feilen

Institute for Energy Studies,
University of North Dakota,
2844 Campus Road, Stop 8153,
Grand Forks, ND 58202-8153
e-mail: harry.feilen@engr.und.edu

Michael Mann

Institute for Energy Studies,
University of North Dakota,
2844 Campus Road, Stop 8153,
Grand Forks, ND 58202-8153
e-mail: michael.mann@engr.und.edu

Ryder Shallbetter

Institute for Energy Studies,
University of North Dakota,
2844 Campus Road, Stop 8153,
Grand Forks, ND 58202-8153
e-mail: ryder.shallbetter@und.edu

Teagan Nelson

Envergex LLC,
4200 James Ray Drive, Suite 301,
Grand Forks, ND 58203
e-mail: teagan.nelson@envergex.com

Srivats Srinivasachar

Envergex LLC,
10 Podunk Road,
Sturbridge, MA 01566
e-mail: srivats.srinivasachar@envergex.com

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received July 15, 2017; final manuscript received May 21, 2018; published online June 12, 2018. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 140(11), 112002 (Jun 12, 2018) (8 pages) Paper No: JERT-17-1363; doi: 10.1115/1.4040403 History: Received July 15, 2017; Revised May 21, 2018

We have investigated a novel gas/solid contacting configuration for chemical looping combustion (CLC) with potential operating benefits. CLC configurations are typically able to achieve high fuel conversion efficiencies at the expense of high operating costs and low system reliability. The spouted fluid bed (SB) was identified as an improved reactor configuration for CLC, since it typically exhibits high heat transfer rates and offers the ability to use lower gas flows for material movement compared to bubbling beds (BB). Multiphase Flow with Interphase eXchanges (MFIX) software was used to establish a spouted fluid bed reactor design. An experimental setup was built to supplement the model. The experimental setup was also modified for testing under high temperature, reacting conditions (1073–1273 K). The setup was operated in either a spouted fluid bed or a bubbling bed regime to compare the performance attributes of each. Results for the reactor configurations are presented for CLC using a mixture of carbon monoxide and hydrogen as fuel. Compared to the bubbling bed, the spouted fluid bed reactor achieved an equivalent or better fuel conversion at a lower pressure drop over the material bed. The spouted fluid bed design represents a viable configuration to improve gas/solid contacting for efficient fuel conversion, lower energy requirements for material movement and increase operational robustness for CLC. The research laid the groundwork for future research into a multi-phase reacting flow CLC system. The system will be developed from computational fluid dynamic modeling and pilot-scale testing to expedite the development of CLC technologies.

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Figures

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Fig. 1

Illustration of a spouted fluid bed system

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Fig. 2

Geometry and dimensions of the spouted fluid bed test system

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Fig. 3

Effect of spout velocity on oxygen carrier annular residence time in cold flow spouted fluid bed reactor

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Fig. 4

Spouting in cold flow spouted fluid bed reactor (Usp/Umf = 225 and Ubg/Umf = 1.2)

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Fig. 5

Cold flow experiments—pressure drop over material bed

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Fig. 6

Cold flow 2D axisymmetric model of spouted fluid bed (Usp/Umf = 225 and Ubg/Umf = 1.2)

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Fig. 7

Fuel conversion for different reactor configurations

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Fig. 8

Pressure drop over material bed for the high temperature spouted fluid bed (Usp/Umf = 225 and Ubg/Umf = 1.2) and bubbling bed reactor configurations

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Fig. 9

Frequency spectra of computed pressure drop fluctuations above the distributor plate for both spouted and bubbling bed simulations

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Fig. 10

Temperature variation between spouted fluid bed (Usp/Umf = 225 and Ubg/Umf = 1.2) and bubbling bed reactor configurations

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