Characterization of chemical looping combustion of coal in a 1kWth reactor with a nickel-based oxygen carrier

Shen, Laihong; Wu, Jiahua; Gao, Zhengping; Xiao, Jun

doi:10.1016/j.combustflame.2009.10.009

Cited by 115 publications

(97 citation statements)

References 32 publications

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“…In the literature it was found that the temperature in the fuel reactor is one of the parameters with most influence on coal conversion [10,12,16] because of its effect on the gasification rate. Indeed, the gasification step has high influence on the performance of this process [24][25][26][27].…”

Section: Resultsmentioning

confidence: 99%

“…In previous CLC experiments with solid fuels performed to date, full oxidation of the outlet fuel reactor stream could not be achieved [8][9][10][11][12][13][14][15][16][17]. Furthermore, the extent of unburt gases was similar as if a highly Ni-based oxygen carrier was used [14][15][16].…”

Section: Solid Fuelmentioning

confidence: 98%

“…Furthermore, the extent of unburt gases was similar as if a highly Ni-based oxygen carrier was used [14][15][16]. Therefore, in order to oxidize completely unburnt compounds to CO 2 and H 2 O and enhance combustion, an oxygen polishing step downstream was proposed, that is, injection of pure oxygen to the gas flow after the fuel reactor cyclone [8,9], with the corresponding oxygen demand.…”

Section: Solid Fuelmentioning

confidence: 99%

“…The most used for solid fuel combustion is the two interconnected fluidized beds configuration [8][9][10][11][12][13][14][15][16][17], for which the two reactors are the fuel and the air reactor. In the fuel reactor the oxygen carrier is reduced through oxidation of the fuel, thus obtaining a gas stream composed of CO 2 and H 2 O.…”

Section: Introductionmentioning

confidence: 99%

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Relevance of the coal rank on the performance of the in situ gasification chemical-looping combustion

Cuadrat

Abad

Gayán

et al. 2012

Chemical Engineering Journal

102

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In this work the CLC process for solid fuels using ilmenite as oxygen carrier was evaluated in a continuous CLC unit. In this process, gasification of solid fuel happens in the fuel reactor which is fluidized by a gasifying agent, i.e, H 2 O. This process has been referred as in-situ Gasification CLC, iG-CLC. The feasibility of using fuels ranging from lignite to anthracite and the effect of the coal rank on the process performance was evaluated. The carbon capture efficiency followed the trend of the coal rank, as it was higher for lignite, then for the bituminous coals and it was lower for anthracite. Special attention was put on the combustion of the volatile matter of the different fuels. In all cases oxygen demands lower than 10% were found; for anthracite the oxygen demand values were 3.5% because of the lower volatile content of this fuel. A temperature increase was proven to be advantageous to reach high carbon capture and combustion efficiencies for all the fuels tested. Also, the feasibility of using H 2 O:CO 2 mixtures as gasification agent with each type of fuel was also assessed and it was seen that in case of bituminous coals and lignite some of H 2 O can be replaced by CO 2 .

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Section: Resultsmentioning

confidence: 99%

Section: Solid Fuelmentioning

confidence: 98%

Section: Solid Fuelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Relevance of the coal rank on the performance of the in situ gasification chemical-looping combustion

Cuadrat

Abad

Gayán

et al. 2012

Chemical Engineering Journal

102

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“…CLC is mostly carried out in two interconnected fluidized-bed reactors with the OC in the form of particles circulating in between [1][2][3][4][5][6][7]. Alternatively, a rotary reactor consisting of a large number of micro-channels was proposed in previous studies [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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

Zhao

Ghoniem

2014

Fuel

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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  Corresponding author. Tel.: +1 617 253 2295. E-mail address: ghoniem@mit.edu (A.F. Ghoniem) 2 strategies proposed in Part 1, and the performances are evaluated using a one-dimensional plugflow 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 40K 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.

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Chemical Looping Combustion and Gasification

Fan

Chung

Bayham

et al. 2015

Handbook of Clean Energy Systems

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With the emerging challenge of climate change and the continued escalation of energy demands, innovative and flexible fuel conversion technologies are necessary and gaining recognition. Chemical looping technologies have the potential to not only reduce energy costs, but also to mitigate carbon emissions. Historically, the general concept of this reduction–oxidation mechanism has been suggested, but the process was never commercialized. Recent interests in carbon capture techniques have revitalized the adaptive chemical looping system. Chemical looping technologies can utilize both gaseous and solid fuels such as natural gas and coal, respectively, for power, hydrogen, or chemical generation. However, the success of technological adoption requires a thorough understanding of the types of chemical looping techniques, the design considerations, and the reactor modes of configurations. Current large‐scale testing units are examined with the hope for near‐term advancement and future commercial application.

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Characterization of chemical looping combustion of coal in a 1kWth reactor with a nickel-based oxygen carrier

Cited by 115 publications

References 32 publications

Relevance of the coal rank on the performance of the in situ gasification chemical-looping combustion

Relevance of the coal rank on the performance of the in situ gasification chemical-looping combustion

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

Chemical Looping Combustion and Gasification

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