Effect of solid residence time on CO2 selectivity in a semi-continuous chemical looping combustor

Lee, Doyeon; Ryu, Ho-Jung; Shun, Dowon; Bae, Dal-Hee; Baek, Jeom-In

doi:10.1007/s11814-018-0042-8

Cited by 9 publications

(5 citation statements)

References 32 publications

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“…The increasing time of equilibrium states is observed with the increase of the weight ratio of CuO in the oxygen carriers. The equilibrium times performed in the current work have a great relationship with the residence time in the process of chemical-looping combustion, ,, which may shed light on the design and operation of CLC systems. Taking into consideration the low equilibrium time, the residence time for the oxygen carriers with a lower weight fraction of CuO could not have a large value in the process of CLC.…”

Section: Resultsmentioning

confidence: 84%

Numerical Investigation of Nickel–Copper Oxygen Carriers in Chemical-Looping Combustion Process with Zero Emission of CO and H₂

et al. 2019

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The chemical-looping combustion (CLC) technique with an intrinsic feature for carbon capture is playing a critical role in the industrial process planning. As the key technology in CLC, the behaviors of oxygen carriers with different weight ratios of NiO/CuO are investigated using the two-fluid model in this work. The kinetic theory of granular flow is employed for the description of particle motion, while the EMMS model is used to clarify the effect of mesoscale structure on gas–solid interaction in the fuel reactor. With the coexistence of Ni and Cu in the oxygen carriers, a zero emission of H2 and CO is observed at the outlet of the fuel reactor, while the intermediate products of H2 and CO arise in the system with Ni-based oxygen carriers. The complete conversion of CH4 is observed in the fuel reactor with various components of Ni–Cu oxygen carriers. The reactivity of CuO and NiO with gas fuel is analyzed, and the equilibrium state in the CLC system with different weight ratios of NiO/CuO is computed and compared. Moreover, different behaviors of oxygen carriers with mechanical mixing of nickel oxide and copper oxide are explored in the fuel reactor compared with that of Ni–Cu oxygen carriers. In addition, the bubble disturbance leads to the nonuniform distribution of reaction rate in the FR. The simulation results indicate that the Ni4Cu12 oxygen carriers have the most vigorous interaction with gas fuel, whereas the oxygen carriers with mechanical mixing of metal oxides are not recommended in the CLC process. The study assists in providing new insight into the understanding of oxygen carriers in the CLC system.

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Section: Resultsmentioning

confidence: 84%

Numerical Investigation of Nickel–Copper Oxygen Carriers in Chemical-Looping Combustion Process with Zero Emission of CO and H₂

et al. 2019

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“…A combustion efficiency of about 98% and carbon conversion and CO 2 yield of 95% can be achieved in the iG-CLC test of plastic waste. We also noted that Lee et al 23 designed a similar semi-continuous fluidized bed reactor to investigate the effect of the residence time of nickel-based OCs in the reactor on the combustion performance of gaseous fuel. It was found that the CO 2 selectivity in the outlet gas could reach 98% when the ratio of the OC feeding rate to fuel feeding rate was 78 kg/Nm 3 .…”

Section: Introductionmentioning

confidence: 99%

Semi-continuous Operation of Chemical Looping Combustion of Coal Using a Low-Cost Composite Oxygen Carrier

Wang

et al. 2022

Energy Fuels

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To reach the carbon peak by 2030 and achieve carbon neutrality by 2060, the implementation of low-carbon combustion approaches for fossil fuels (especially coal, a high-carbon fuel) is urgent in China. Chemical looping combustion (CLC) has been considered as one of the most promising technologies for low-carbon, efficient, and clean utilization of coal. However, a low-cost and high-performance oxygen carrier (OC) holds the bottleneck that constrains the industrial application of coal-fueled CLC. In this paper, a low-cost composite OC named Cu13.0Red87.0@C (with the mixing mass ratio of copper ore to red mud being 13.0:87.0, except for a 20 wt % cement bonder) was first prepared by the hydroforming method and then systematically evaluated by designing CLC tests in a semi-continuous fluidized bed using lignite as fuel. The results showed that this composite OC exhibited superior combustion performance in comparison to pure red mud. Moreover, it was found that increasing the temperature could significantly improve the average carbon capture efficiency but had a relatively small positive effect on the average CO2 yield. Additionally, with the elevation of the oxygen/fuel ratio, the resulting average carbon capture efficiency and average CO2 yield both tended to increase. Generally, the semi-continuous unit can simulate the continuously operated fuel reactor with an adjustable bed inventory and solid circulation rate, and it is easy to attain smooth operation of ca. 30 min, achieving both carbon capture efficiency and a CO2 yield of ca. 90%.

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“…The Paris Agreement focuses on suppressing the increase in the concentration of atmospheric CO 2 and the increase of CO 2 emissions. 3,5…”

Section: Introductionmentioning

confidence: 99%

“…The Paris Agreement focuses on suppressing the increase in the concentration of atmospheric CO 2 and the increase of CO 2 emissions. 3,5 Currently, Korea is a signatory to this agreement and aims towards a 37% reduction of transition industry BAU CO 2 emissions by 2030. 6 Expansion of nuclear power plants, use of renewable energy, and CCS technology are ways for achieving this goal.…”

Section: Introductionmentioning

confidence: 99%

The prediction of CO₂ emissions in domestic power generation sector between 2020 and 2030 for Korea

Lee

Gwak

Sohn

et al. 2020

Energy & Environment

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In the last ten years, reducing CO2 emissions has been a very important focus across all industries. To efficiently achieve carbon reduction in the power generation sector, various policies, regulations, and legislation have been proposed. In addition, new energy sources and technologies have been developed and widely adopted. In this study, current and future CO2 emissions from the domestic power generation sector were calculated and predicted based on two national power generation plans. The overall power plant efficiencies, operation rate of power plants, power capacities, and CO2 emissions for 2030 were predicted based on the 7th and 8th basic plan for long-term electricity supply and demand in Korea. In addition, the CO2 emissions policies of several major countries announced in accordance with the Paris Climate Agreement were identified and compared with Korea's climate change policy. Finally, the improvement of power generation efficiencies and co-combustion of biomass with coal is recommended to help the reduction of the BAU-based CO2 emissions by 19.4%.

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Effect of solid residence time on CO2 selectivity in a semi-continuous chemical looping combustor

Cited by 9 publications

References 32 publications

Numerical Investigation of Nickel–Copper Oxygen Carriers in Chemical-Looping Combustion Process with Zero Emission of CO and H₂

Numerical Investigation of Nickel–Copper Oxygen Carriers in Chemical-Looping Combustion Process with Zero Emission of CO and H₂

Semi-continuous Operation of Chemical Looping Combustion of Coal Using a Low-Cost Composite Oxygen Carrier

The prediction of CO₂ emissions in domestic power generation sector between 2020 and 2030 for Korea

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Effect of solid residence time on CO2 selectivity in a semi-continuous chemical looping combustor

Cited by 9 publications

References 32 publications

Numerical Investigation of Nickel–Copper Oxygen Carriers in Chemical-Looping Combustion Process with Zero Emission of CO and H2

Numerical Investigation of Nickel–Copper Oxygen Carriers in Chemical-Looping Combustion Process with Zero Emission of CO and H2

Semi-continuous Operation of Chemical Looping Combustion of Coal Using a Low-Cost Composite Oxygen Carrier

The prediction of CO2 emissions in domestic power generation sector between 2020 and 2030 for Korea

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Numerical Investigation of Nickel–Copper Oxygen Carriers in Chemical-Looping Combustion Process with Zero Emission of CO and H₂

Numerical Investigation of Nickel–Copper Oxygen Carriers in Chemical-Looping Combustion Process with Zero Emission of CO and H₂

The prediction of CO₂ emissions in domestic power generation sector between 2020 and 2030 for Korea