Coal-fired chemical looping combustion coupled with a high-efficiency annular carbon stripper

Chen, Hu; Cheng, Mao; Liu, Lei; Li, Ye; Li, Zhenshan; Cai, Ningsheng

doi:10.1016/j.ijggc.2019.102889

Cited by 26 publications

(34 citation statements)

References 33 publications

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“…The fluid density of port 19 ( 19  ) depends on the particle density and the solid fraction of the FR dense phase and is calculated by: 19 p sd =    (10) where sd  represents the solid fraction of the FR dense phase, -.…”

Section: Discussionmentioning

confidence: 99%

“…Introducing equation (10) into equation ( 9), the solid velocity of the overflow port (u19) can be expressed as:…”

Section: Discussionmentioning

confidence: 99%

“…For a CLC unit, choosing an appropriate reactor type is important because it is related to the chemical reaction and operation of the CLC unit. Presently, based on gas-solid hydrodynamic characteristics, CLC units have three reactor types, namely, fluidized bed as air reactor-moving bed as fuel reactor, moving bed as air reactor-fluidized bed as fuel reactor, and fluidized bed as air reactor-fluidized bed as fuel reactor which is also known as two interconnected fluidized beds 10 . For the fluidized bed as air reactor-moving bed as fuel reactor, only Ohio State University has adopted this approach in a 25 kWth CLC unit 11 .…”

Section: Introductionmentioning

confidence: 99%

“…For the moving bed as air reactor-fluidized bed as fuel reactor, only Southeast University has adopted this approach in a 20 kWth CLC unit 12 . The two interconnected fluidized beds approach has been employed by many research institutes as a CLC pilot plant reactor type, such as the 10 kWth 8 and 100 kWth 13 units at Chalmers University of Technology, the 50 kWth unit at Instituto de Carboquímica 14 , the 10 kWth unit at Southeast University 15 , the 10 kWth unit at IFP Énergies Nouvelles 16 , the 50 kWth unit at Huazhong University of Science and Technology 17 , the 10 kWth unit at Tsinghua University 18 , the 225 kWth unit at University of Utah 19 , the 1 MWth unit at Darmstadt University of Technology 20 , and the 3 MWth unit at Alstom Power 21 . Therefore, the two interconnected fluidized beds are the dominant reactor type used for CLC technology.…”

Section: Introductionmentioning

confidence: 99%

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Solid Circulation Study in a 1.5 MW_th Cold Flow Model of Chemical Looping Combustion

Liu

et al. 2021

Ind. Eng. Chem. Res.

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Solid circulation in chemical looping combustion (CLC) is very important and affects the mass and heat balance and auto-thermal operation of a CLC system. A key task in developing CLC technology is to control the solid circulation. In this work, the solid circulation characteristic of a 1.5 MWth CLC cold flow model is reported. The solid circulation between the fuel reactor and the simplified air reactor riser is controlled by the overflow method. Three kinds of quartz sands are selected as fluidized particles, and their median particle diameters are 392 μm, 249 μm and 122 μm, respectively.Reasonable pressure profile is obtained in the 1.5 MWth CLC cold flow model. The effects of operational parameters, including the fuel reactor gas velocity, loop seal gas velocity, simplified riser gas velocity, particle size and static bed height, on the solid circulation and hydrodynamic characteristics are measured and analyzed. The maximum solid circulation rate can approach 130 kg/(m 2 •s), and this value satisfies the

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Section: Discussionmentioning

confidence: 99%

“…Introducing equation (10) into equation ( 9), the solid velocity of the overflow port (u19) can be expressed as:…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Solid Circulation Study in a 1.5 MW_th Cold Flow Model of Chemical Looping Combustion

Liu

et al. 2021

Ind. Eng. Chem. Res.

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“…To solve above challenges, different FR configurations were proposed by different scholars [9][10][11][12][13][14][15][16][17][18][19][20] . Bayham et al 9 proposed using a moving bed as the FR in the 25 kWth hot model at Ohio State University, the carbon capture efficiency, char conversion and syngas conversion efficiency were 94.9%, 99.9% and 99.8% respectively.…”

Section: Introductionmentioning

confidence: 99%

Cold Model Study of a 1.5 MW_th Circulating Turbulent Fluidized Bed Fuel Reactor in Chemical Looping Combustion

Liu

et al. 2020

Energy Fuels

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A circulating turbulent fluidized bed (CTFB) connected with a riser and an annular carbon stripper (CS) is proposed to be used as a fuel reactor (FR) in chemical looping combustion. The bottom section of the FR is operated under turbulent fluidization regime which can achieve enough solid residence time and enhance the mixing of oxygen carrier with solid fuel. A 1.5 MWth cold model of the FR was designed, constructed and tested in order to investigate the hydrodynamics of solid particles with different size. Three kinds of quartz sands with different particle sizes (d50=122 μm, 249 μm, and 392 μm) were used as bed materials to simulate the oxygen carrier.Continuous operation with reasonable pressure balance was achieved in the cold model. The effects of important variables including gas velocity, static bed height and 2 particle size on the gas-solid hydrodynamics of the FR were measured and discussed.It was found that the transition velocities from bubbling to turbulent fluidization for different particles of d50=122 μm, 249 μm, and 392 μm were measured to be 0.78 m/s, 0.95 m/s and 1.06 m/s respectively, indicating the transition velocity increased with increasing particle size. The solid fraction profile along reactor height and solid circulation rate were affected by gas velocity and static bed height. A modified correlation was proposed to predict the solid fraction of the annular CS dilute phase, and the predicted results agree well with the experimental data under wide range of operational conditions.

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Chemical looping reforming: process fundamentals and oxygen carriers

et al. 2022

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Chemical looping reforming (CLR) provides a viable process intensification approach for clean and efficient syngas production from carbonaceous fuel with inherent gas–gas separation. The rational design of metal oxide-based oxygen carriers and the scale-up of associated CLR reactor systems play important roles in CLR process development. This review first introduces the concept and advantages of CLR as well as its historical development. The process fundamentals, including basic schemes, reaction stoichiometry, thermodynamics, kinetics and reactor system design, are reviewed. The integral approach for CLR process development is illustrated, showing that the design and compatibility of oxygen carriers and reactor systems are critical for CLR performance. The reaction principle during the reduction of oxygen carriers is discussed, followed by strategies for improving the redox reactivity and stability. We further review and discuss the latest exciting advances on this subject with the purpose of illustrating factors that govern fundamental mechanisms in the redox reaction chemistry of oxygen carriers and their design principles for sustained chemical looping reactor applications. It is expected that these new advances will inspire more effective oxygen carriers and efficient reactor systems for the development and deployment of various CLR processes.

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Coal-fired chemical looping combustion coupled with a high-efficiency annular carbon stripper

Cited by 26 publications

References 33 publications

Solid Circulation Study in a 1.5 MW_th Cold Flow Model of Chemical Looping Combustion

Solid Circulation Study in a 1.5 MW_th Cold Flow Model of Chemical Looping Combustion

Cold Model Study of a 1.5 MW_th Circulating Turbulent Fluidized Bed Fuel Reactor in Chemical Looping Combustion

Chemical looping reforming: process fundamentals and oxygen carriers

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Coal-fired chemical looping combustion coupled with a high-efficiency annular carbon stripper

Cited by 26 publications

References 33 publications

Solid Circulation Study in a 1.5 MWth Cold Flow Model of Chemical Looping Combustion

Solid Circulation Study in a 1.5 MWth Cold Flow Model of Chemical Looping Combustion

Cold Model Study of a 1.5 MWth Circulating Turbulent Fluidized Bed Fuel Reactor in Chemical Looping Combustion

Chemical looping reforming: process fundamentals and oxygen carriers

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Product

Resources

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Solid Circulation Study in a 1.5 MW_th Cold Flow Model of Chemical Looping Combustion

Solid Circulation Study in a 1.5 MW_th Cold Flow Model of Chemical Looping Combustion

Cold Model Study of a 1.5 MW_th Circulating Turbulent Fluidized Bed Fuel Reactor in Chemical Looping Combustion