Experimental investigation of some metal oxides for chemical looping combustion in a fluidized bed reactor

Chandel, Munish K.; Hoteit, Ali; Delebarre, Arnaud

doi:10.1016/j.fuel.2008.12.006

Cited by 53 publications

(51 citation statements)

References 19 publications

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“…In each reactor system, the reduction of a NiOoxygen carrier with methane feedstock is explored. A semibatch fluidized bed unit from the literature (Chandel et al, 2009) is chosen as the prototype reactor in this analysis. A fixed bed reactor is designed, based on the experimental setup of Iliuta et al (2010) to match the feed flow and solids inventory of the fluidized bed reactor.…”

Section: Model Descriptionmentioning

confidence: 99%

“…Table 2 shows the reaction scheme used in this study for a Ni-based, CH 4 -fed CLC system. The reaction scheme and kinetics have been validated against published fixed bed chemical-looping units from the literature (Ryu et al, 2003;Corbella et al, 2005, Rydén et al, 2008Iliuta et al, 2010) and in-house fixed bed experiments (Zhou et al, 2013); and were further validated against reported fluidized bed experimental data from the literature (Chandel et al, 2009;Ryu et al, 2009;Iliuta et al, 2010) with a threephase fluidized bed model (Zhou et al, 2014). Reactions involved include NiO reduction reactions (with CH 4 , H 2 and CO), Ni-catalyzed reforming reactions (steam reforming, dry reforming and water gas shift reaction) and Nicatalyzed carbon formation or elimination reactions (CH 4 decomposition and carbon gasification by H 2 O and CO 2 ).…”

Section: Model Descriptionmentioning

confidence: 99%

“…A dynamic three-phase (bubble, emulsion and wake) flow model is used to predict bubbling bed hydrodynamics (Kunii and Levenspiel, 1968a, b) in the semi-batch reactor of Chandel et al (2009). The model considers gas bubbles flowing through a dense emulsion phase at a relative velocity given by the minimum fluidization velocity, with gas percolating through the bed of solids.…”

Section: Fluidized Bed Modelmentioning

confidence: 99%

“…The freeboard region is modeled as a one-dimensional two- Zhou et al (2014). The model performance and accuracy, as applied on the data by Chandel et al (2009) are shown in Fig. 3(b).…”

Section: Fluidized Bed Modelmentioning

confidence: 99%

“…4). Depending on the bed position and reaction time (affecting temperature and gas composition), a range of d P * and U * for the unit of Chandel et al (2009) was obtained (dots in Fig. 4, enclosed within the dark shaded area), which falls into the bubbling fluidization regime.…”

Section: Fluidized Bed Modelmentioning

confidence: 99%

See 4 more Smart Citations

Overview of Chemical-Looping Reduction in Fixed Bed and Fluidized Bed Reactors Focused on Oxygen Carrier Utilization and Reactor Efficiency

Zhou

Han

Bollas

2014

Aerosol Air Qual. Res.

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A model-assisted comparison of two types of chemical-looping (CL) reactors (fixed bed and fluidized bed), with the same oxygen carrier loading and fuel capacity, is carried out to examine performance and efficiency of CL Reducers, operating with methane as the feedstock and nickel oxide as the oxygen carrier. The study focuses on the reduction step of chemical-looping combustion (CLC), for which the reactor efficiency and fuel utilization are crucial in terms of economics and carbon capture efficiency. Process models (a three phase dynamic model for bubbling fluidized beds and a two dimensional homogeneous model for fixed beds) and reaction kinetics developed and validated in previous studies are used. A fluidized bed chemical-looping combustion Reducer is compared to a fixed bed equivalent reactor, scaled-up from a smaller experimental reactor, constrained to bed height to reactor diameter ratios that prohibit excessive temperature and pressure drops across the bed. Through a detailed comparison, CLC operated in the fluidized bed reactor is shown to deliver superior performance, i.e., uniform temperature and pressure distribution; high methane conversion (> 95%) and carbon dioxide selectivity (> 95%) sustained for longer reduction periods; negligible carbon formation (< 2 mol% C basis); and better efficiency in oxygen carrier utilization.

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Section: Model Descriptionmentioning

confidence: 99%

Section: Model Descriptionmentioning

confidence: 99%

Section: Fluidized Bed Modelmentioning

confidence: 99%

“…The freeboard region is modeled as a one-dimensional two- Zhou et al (2014). The model performance and accuracy, as applied on the data by Chandel et al (2009) are shown in Fig. 3(b).…”

Section: Fluidized Bed Modelmentioning

confidence: 99%

Section: Fluidized Bed Modelmentioning

confidence: 99%

See 3 more Smart Citations

Overview of Chemical-Looping Reduction in Fixed Bed and Fluidized Bed Reactors Focused on Oxygen Carrier Utilization and Reactor Efficiency

Zhou

Han

Bollas

2014

Aerosol Air Qual. Res.

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200-MW chemical looping combustion based thermal power plant for clean power generation

Sharma

Chandel

Delebarre³

et al. 2011

Int. J. Energy Res.

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SUMMARY The present study demonstrates a possible configuration of a 200 MW chemical looping combustion (CLC) system with methane (CH4) as fuel. Iron oxide‐based oxygen carriers were used because of its non‐toxic nature, low‐cost, and wide availability. We analyzed the effects of different variables on the design of the system. For the air reactor (oxidizer), bed mass is independent, and for the fuel reactor (reducer), it decreases with increase in the conversion difference between the air and fuel reactors. On the other hand, the pressure drop in the air reactor is unchanged, whereas for the fuel reactor, it decreases with the same increase of conversion difference between air and fuel reactors. Also, entrained solid mass flow rate from the air to fuel reactor shows a decreasing trend. Bed mass, bed height, pressure drop, and residence time of the bed materials decrease with increase in the conversion rates in the air and fuel reactors. Residence time of bed material in the air and fuel reactor reduces with increase in the temperature of the air reactor. Copyright © 2011 John Wiley & Sons, Ltd.

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Chemical-looping combustion - an overview and application of the recirculating fluidized bed reactor for improvement

Sharma

Delebarre

Alappat

2014

Int. J. Energy Res.

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SUMMARYThis paper propose recirculating fluidized bed (RCFB) reactor for chemical-looping combustion (CLC) to overcome some of the issues associated with the existing interconnected reactors arrangements like low residence time of bed material in the air reactor, high attrition of bed material in the cyclone separator, cluster formation in the air reactor, complex operation involving loop seals and high heat losses. RCFB has high solid circulation rate, long residence time, efficient fuel-oxygen carrier contact, low heat losses and low gas leak in between the reactors, as compared to the existing reactor configurations. A cold model study was performed on a Perspex made, semicircular, transparent RCFB reactor. A single RCFB reactor was operated in the alternate oxidation and fuel burning cycles to simulate the interconnected reactors arrangement for CLC. The generated experimental data has been used to predict the optimal RCFB reactor configuration for a RCFB-based CLC power plant.

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Experimental investigation of some metal oxides for chemical looping combustion in a fluidized bed reactor

Cited by 53 publications

References 19 publications

Overview of Chemical-Looping Reduction in Fixed Bed and Fluidized Bed Reactors Focused on Oxygen Carrier Utilization and Reactor Efficiency

Overview of Chemical-Looping Reduction in Fixed Bed and Fluidized Bed Reactors Focused on Oxygen Carrier Utilization and Reactor Efficiency

200-MW chemical looping combustion based thermal power plant for clean power generation

Chemical-looping combustion - an overview and application of the recirculating fluidized bed reactor for improvement

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