Chemical looping combustion of lignite with the CaSO4–CoO mixed oxygen carrier

Wang, Baowen; Li, Heyu; Wang, Wei; Luo, Cong; Mei, Daofeng

doi:10.1016/j.joei.2019.11.006

Cited by 29 publications

(11 citation statements)

References 63 publications

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“…20 Another practice is to add some active transition metal oxides to modify CaSO 4 , such as Fe 2 O 3 , 10,12,13 CuO, 21 Mn 3 O 4 , 22 or CoO. 23 As known, to inhibit the occurrence of the side reactions listed above and prevent detrimental SO 2 released, lowering the reaction temperature seems to be a good option, 24 but the conversion efficiency of coal is unavoidably decreased. Alternatively, adding these active metal oxides in the CaSO 4 OC could improve the reactivity of CaSO 4 and, meanwhile, maintain the enhanced CO 2 concentration via efficient conversion of the fuel at a relatively low reaction temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Another practice is to add some active transition metal oxides to modify CaSO 4 , such as Fe 2 O 3 , ,, CuO, Mn 3 O 4 , or CoO . As known, to inhibit the occurrence of the side reactions listed above and prevent detrimental SO 2 released, lowering the reaction temperature seems to be a good option, but the conversion efficiency of coal is unavoidably decreased.…”

Section: Introductionmentioning

confidence: 99%

“…A desired synergistic promotion between CaSO 4 and the added transition oxides could be initiated. Our group − has continuously studied the reaction characteristics of CuO-, Mn 3 O 4 -, and CoO-modified CaSO 4 OC, which showed that the addition of these active transition metal oxides was advantageous to improve the reactivity of CaSO 4 as well as to fix the release of sulfur through the CaSO 4 side reactions, but further effort in this direction was still needed for efficient conversion of fuel at the simultaneous carbon capture and in situ retention of sulfur.…”

Section: Introductionmentioning

confidence: 99%

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Chemical Looping Combustion Characteristics of Coal with a Novel CaSO₄–Ca₂CuO₃ Mixed Oxygen Carrier

Wang

Liang

et al. 2020

Energy Fuels

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Resource utilization of the disposed CaSO 4 waste as an oxygen carrier (OC) in chemical looping combustion (CLC) is of great meaning as a result of its attractive strengths, such as easy availability, low cost, large oxygen capacity, and avoidance of potential environmental harm. In this research, a novel mixed OC of CaSO 4 doped with Ca 2 CuO 3 was first reported and produced using a combined template preparation method. Its reaction behavior with a typical lignite designated as YN was studied, which indicated that doped Ca 2 CuO 3 well enhanced the reactivity of CaSO 4 with YN coal. The CO 2 yield as formed was greatly accelerated, while SO 2 evolved from the CaSO 4 side reactions could be effectively controlled, as expected. Furthermore, the potential oxygen transfer mechanism during the CaSO 4 −Ca 2 CuO 3 mixed OC reaction with YN coal was revealed, wherein elemental Cu derived from reduced Ca 2 CuO 3 could regain lattice oxygen inherent in unreacted CaSO 4 via its melting interface. In situ reoxidized CuO would decompose and emit O 2 for direct combustion of residual char of YN. Then, migration and redistribution of the sulfur species were completely investigated. Added Ca 2 CuO 3 was found to be reduced to CaO and elemental Cu during its reaction with YN, both of which were able to directionally fix gaseous sulfur evolved from CaSO 4 to form CaS and Cu 2 S, respectively. Thus, the gaseous sulfur retention capacity of this mixed OC was much improved. In addition, the prepared CaSO 4 −Ca 2 CuO 3 mixed OC demonstrated good regeneration capacity and strong sintering resistance as well. Overall, the novel CaSO 4 −Ca 2 CuO 3 mixed OC as reported possessed good reactivity and directional fixation of gaseous sulfur, which benefited from simultaneous carbon capture and in situ desulfurization in CLC, and as such is quite attractive for future application.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chemical Looping Combustion Characteristics of Coal with a Novel CaSO₄–Ca₂CuO₃ Mixed Oxygen Carrier

Wang

Liang

et al. 2020

Energy Fuels

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“… 14 In addition, thermodynamic analysis and experimental studies have also indicated that when high-valence Fe 2 O 3 is reduced to low-valence Fe 3 O 4 , the fuel can be effectively converted to CO 2 and H 2 O. 6 , 15 − 19 …”

Section: Introductionmentioning

confidence: 99%

Assessment of the Redox Characteristics of Iron Ore by Introducing Biomass Ash in the Chemical Looping Combustion Process: Biomass Ash Type, Constituent, and Operating Parameters

Huo

Chu

et al. 2021

ACS Omega

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Chemical looping combustion (CLC) is a potential CO 2 capture and sequestration (CCS) technology that can easily separate CO 2 and H 2 O without energy loss and greatly improve the efficiency of carbon capture. Due to the inherent defects of natural iron ore, such as low reactivity and poor oxygen carrying capacity, four kinds of biomass ashes (rape stalk ash, rice stalk ash, platane wood ash, and U. lactuca ash) that have different constituents of K, Na, Ca, and Si were applied to modify the redox performance of natural iron ore. The effects of biomass ash type, constituent, reaction temperature, H 2 O vapor flow rate, and redox cycle on the CLC process were assessed experimentally in a batch fluidized bed reactor system. Oxygen carrier physicochemical characteristics were determined by several analytical techniques. The results showed that rape stalk ash, platane wood ash, and U. lactuca ash with a high K content and high K/Si ratio significantly improved the reactivity and cycle stability of iron ore, even after 10 redox cycles, while rice straw ash with a low K/Si ratio showed an inhibitory effect due to the formation of bridge eutectics, which enhanced agglomeration. In a range from 800 to 950 °C, higher temperatures led to a much better ability to promote the CLC process than lower temperatures. A higher flow rate of H 2 O had little effect on the further promotion of the CLC process due to hydrogen inhibition. It is believed that the application of BA-modified iron ore oxygen carriers is an effective strategy to improve the CLC process.

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“…The chemical looping technology is based on the redox reactions of an oxygen carrier. , The key part of the oxygen carrier is the active component, which is directly involved in the redox reactions. Transition metal oxides, such as Fe-, Ni-, Cu-, Mn-, and Co-based oxides, are the most frequently used oxygen carriers in chemical looping processes. − Among the various oxides, iron oxides are particularly attractive due to their low cost and easy availability. − To improve the long-term stability of Fe-based oxygen carriers, various inert supports, such as Al 2 O 3 , TiO 2 , SiO 2 , and MgAl 2 O 4 , were investigated. ,− In most studies, Al 2 O 3 was often selected as the support to stabilize the microstructure of the active component. ,, …”

Section: Introductionmentioning

confidence: 99%

Activation Mechanism of Fe₂O₃-Al₂O₃ Oxygen Carrier in Chemical Looping Combustion

Zhang

2020

Energy Fuels

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Because of the low cost and easy availability, iron oxides have been widely used in chemical looping combustion. However, pure iron oxides often suffered from a loss of oxygen carrying capacity in redox cycles due to thermal sintering. The redox performance of iron oxides can be improved by the addition of Al 2 O 3 as a support. In this study, the investigation was carried out regarding the activation behavior of a Fe 2 O 3 -Al 2 O 3 oxygen carrier in initial cycles. The combined use of different textural and morphological characterization techniques (X-ray diffraction (XRD), X-ray photoelectron spectroscopy XPS, Hg intrusion, and scanning electron microscopy−energy-dispersive spectrometry (SEM-EDS)) was conducted to reveal how microscopic changes triggered the activation of the Fe 2 O 3 -Al 2 O 3 sample. It indicated that the activation process of the Fe 2 O 3 -Al 2 O 3 sample was caused by the outward migration of Fe cations to the sample surface. A fresh sample presented a surface with a dense and nonporous structure. However, once the sample was activated after the cyclic reactions, Fe cations were enriched on the sample surface in the form of small grains. This leads to enhanced redox activity and increased oxygen carrying capacity.

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Chemical looping combustion of lignite with the CaSO4–CoO mixed oxygen carrier

Cited by 29 publications

References 63 publications

Chemical Looping Combustion Characteristics of Coal with a Novel CaSO₄–Ca₂CuO₃ Mixed Oxygen Carrier

Chemical Looping Combustion Characteristics of Coal with a Novel CaSO₄–Ca₂CuO₃ Mixed Oxygen Carrier

Assessment of the Redox Characteristics of Iron Ore by Introducing Biomass Ash in the Chemical Looping Combustion Process: Biomass Ash Type, Constituent, and Operating Parameters

Activation Mechanism of Fe₂O₃-Al₂O₃ Oxygen Carrier in Chemical Looping Combustion

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Chemical looping combustion of lignite with the CaSO4–CoO mixed oxygen carrier

Cited by 29 publications

References 63 publications

Chemical Looping Combustion Characteristics of Coal with a Novel CaSO4–Ca2CuO3 Mixed Oxygen Carrier

Chemical Looping Combustion Characteristics of Coal with a Novel CaSO4–Ca2CuO3 Mixed Oxygen Carrier

Assessment of the Redox Characteristics of Iron Ore by Introducing Biomass Ash in the Chemical Looping Combustion Process: Biomass Ash Type, Constituent, and Operating Parameters

Activation Mechanism of Fe2O3-Al2O3 Oxygen Carrier in Chemical Looping Combustion

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Chemical Looping Combustion Characteristics of Coal with a Novel CaSO₄–Ca₂CuO₃ Mixed Oxygen Carrier

Chemical Looping Combustion Characteristics of Coal with a Novel CaSO₄–Ca₂CuO₃ Mixed Oxygen Carrier

Activation Mechanism of Fe₂O₃-Al₂O₃ Oxygen Carrier in Chemical Looping Combustion