Design of a rotary reactor for chemical-looping combustion. Part 2: Comparison of copper-, nickel-, and iron-based oxygen carriers

Handle URI:
http://hdl.handle.net/10754/597943
Title:
Design of a rotary reactor for chemical-looping combustion. Part 2: Comparison of copper-, nickel-, and iron-based oxygen carriers
Authors:
Zhao, Zhenlong; Ghoniem, Ahmed F.
Abstract:
Chemical-looping combustion (CLC) is a novel and promising option for several applications including carbon capture (CC), fuel reforming, H 2 generation, etc. Previous studies demonstrated the feasibility of performing CLC in a novel rotary design with micro-channel structures. Part 1 of this series studied the fundamentals of the reactor design and proposed a comprehensive design procedure, enabling a systematic methodology of designing and evaluating the rotary CLC reactor with different OCs and operating conditions. This paper presents the application of the methodology to the designs with three commonly used OCs, i.e., copper, nickel, and iron. The physical properties and the reactivities of the three OCs are compared at operating conditions suitable for the rotary CLC. Nickel has the highest reduction rate, but relatively slow oxidation reactivity while the iron reduction rate is most sensitive to the fuel concentration. The design parameters and the operating conditions for the three OCs are selected, following the strategies proposed in Part 1, and the performances are evaluated using a one-dimensional plug-flow model developed previously. The simulations show that for all OCs, complete fuel conversion and high carbon separation efficiency can be achieved at periodic stationary state with reasonable operational stabilities. The nickel-based design includes the smallest dimensions because of its fast reduction rate. The operation of nickel case is mainly limited to the slow oxidation rate, and hence a relatively large share of air sector is used. The iron-based design has the largest size, due to its slow reduction reactivity near the exit or in the fuel purge sector where the fuel concentration is low. The gas flow temperature increases monotonically for all the cases, and is mainly determined by the solid temperature. In the periodic state, the local temperature variation is within 40 K and the thermal distortion is limited. The design of the rotary CLC is also scaled to different pressures and inlet temperatures. The method of scaling is discussed and desirable operational performances are obtained. © 2013 Elsevier Ltd. All rights reserved.
Citation:
Zhao Z, Ghoniem AF (2014) Design of a rotary reactor for chemical-looping combustion. Part 2: Comparison of copper-, nickel-, and iron-based oxygen carriers. Fuel 121: 344–360. Available: http://dx.doi.org/10.1016/j.fuel.2013.11.055.
Publisher:
Elsevier BV
Journal:
Fuel
Issue Date:
Apr-2014
DOI:
10.1016/j.fuel.2013.11.055
Type:
Article
ISSN:
0016-2361
Sponsors:
This study is financially supported by a grant from the MASDAR Institute of Science and Technology and the King Abdullah University of Science and Technology (KAUST) Investigator Award.
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorZhao, Zhenlongen
dc.contributor.authorGhoniem, Ahmed F.en
dc.date.accessioned2016-02-25T12:59:18Zen
dc.date.available2016-02-25T12:59:18Zen
dc.date.issued2014-04en
dc.identifier.citationZhao Z, Ghoniem AF (2014) Design of a rotary reactor for chemical-looping combustion. Part 2: Comparison of copper-, nickel-, and iron-based oxygen carriers. Fuel 121: 344–360. Available: http://dx.doi.org/10.1016/j.fuel.2013.11.055.en
dc.identifier.issn0016-2361en
dc.identifier.doi10.1016/j.fuel.2013.11.055en
dc.identifier.urihttp://hdl.handle.net/10754/597943en
dc.description.abstractChemical-looping combustion (CLC) is a novel and promising option for several applications including carbon capture (CC), fuel reforming, H 2 generation, etc. Previous studies demonstrated the feasibility of performing CLC in a novel rotary design with micro-channel structures. Part 1 of this series studied the fundamentals of the reactor design and proposed a comprehensive design procedure, enabling a systematic methodology of designing and evaluating the rotary CLC reactor with different OCs and operating conditions. This paper presents the application of the methodology to the designs with three commonly used OCs, i.e., copper, nickel, and iron. The physical properties and the reactivities of the three OCs are compared at operating conditions suitable for the rotary CLC. Nickel has the highest reduction rate, but relatively slow oxidation reactivity while the iron reduction rate is most sensitive to the fuel concentration. The design parameters and the operating conditions for the three OCs are selected, following the strategies proposed in Part 1, and the performances are evaluated using a one-dimensional plug-flow model developed previously. The simulations show that for all OCs, complete fuel conversion and high carbon separation efficiency can be achieved at periodic stationary state with reasonable operational stabilities. The nickel-based design includes the smallest dimensions because of its fast reduction rate. The operation of nickel case is mainly limited to the slow oxidation rate, and hence a relatively large share of air sector is used. The iron-based design has the largest size, due to its slow reduction reactivity near the exit or in the fuel purge sector where the fuel concentration is low. The gas flow temperature increases monotonically for all the cases, and is mainly determined by the solid temperature. In the periodic state, the local temperature variation is within 40 K and the thermal distortion is limited. The design of the rotary CLC is also scaled to different pressures and inlet temperatures. The method of scaling is discussed and desirable operational performances are obtained. © 2013 Elsevier Ltd. All rights reserved.en
dc.description.sponsorshipThis study is financially supported by a grant from the MASDAR Institute of Science and Technology and the King Abdullah University of Science and Technology (KAUST) Investigator Award.en
dc.publisherElsevier BVen
dc.subjectChemical-looping combustionen
dc.subjectCO2 captureen
dc.subjectOxygen carriersen
dc.subjectRotary reactoren
dc.titleDesign of a rotary reactor for chemical-looping combustion. Part 2: Comparison of copper-, nickel-, and iron-based oxygen carriersen
dc.typeArticleen
dc.identifier.journalFuelen
dc.contributor.institutionMassachusetts Institute of Technology, Cambridge, United Statesen
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