Effect of Lime Addition to CaSO 4 Oxygen Carrier in Chemical Looping Combustion

Ding, Ning; Zhang, Peng-Fei; Guan, Ning; Jiang, Guilin; Zhang, Chengwu; Liu, Zhigang

doi:10.1590/0104-6632.20180351s20160299

Cited by 4 publications

(3 citation statements)

References 33 publications

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“…Correspondingly, from Figure 5a, the CO 2 yield from the YN reaction with CaSO 4 −CaO was quite low. However, as a result of the good sulfur fixation characteristics of added CaO, 15,51 especially within the optimized temperature range for SO 2 retention, as shown in Figure 5b, gaseous sulfur released from CaSO 4 was efficiently controlled. Thus, the amount of SO 2 decreased significantly, and SO 2 emitted as observed in Figure 5b was much lower for the YN reaction with the CaSO 4 −CaO mixed OC.…”

Section: Sample Characterizationmentioning

confidence: 99%

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: Sample Characterizationmentioning

confidence: 99%

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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“…To improve the reactivity of CaSO 4 and avoid the generation of SO 2 from CaSO 4 in both reactors, several alternatives have been proposed. Some studies have reported that the addition of Fe 2 O 3 to CaSO 4 by different preparation methods [34][35][36][37] Other studies have reported that the addition of K 2 CO 3 via the impregnation method can improve the reactivity between the oxygen carrier and coal. 38,39 In open literature, the investigated CaSO 4 oxygen carriers are mostly pure CaSO 4 , anhydrite ore having high CaSO 4 content (>94 wt%) or CaSO 4 modied by adding a small amount of active metal oxide.…”

Section: Introductionmentioning

confidence: 99%

“…38,39 In open literature, the investigated CaSO 4 oxygen carriers are mostly pure CaSO 4 , anhydrite ore having high CaSO 4 content (>94 wt%) or CaSO 4 modied by adding a small amount of active metal oxide. [34][35][36][37][38][39] However, the conversion between the oxidized state (CaSO 4 ) and the reduced state (CaS) may signicantly change the structure of the oxygen carrier due to its high oxygen transport capacity. On the other hand, a large amount of heat generated by the oxide reaction of CaS can result in an increase in the localized temperature of the particles and eventually sintering of the oxygen carrier.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of a CaSO₄ composite oxygen carrier supported with an active material for in situ gasification chemical looping combustion of coal

et al. 2018

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CaSO 4 is considered to be a potential oxygen carrier for chemical-looping combustion (CLC) due to its cheapness and high oxygen transport capacity. To improve the physicochemical stability of the CaSO 4 oxygen carrier, CaSO 4 composite oxygen carriers supported with clay, cement, and ash separately were prepared. It was found that the attrition resistance of the CaSO 4 oxygen carrier composed of clay and cement improved due to the bond action of clay and cement. The reactivity of the composite oxygen carrier with coal was investigated in a thermogravimetric analyser (TGA) and fluidised bed. Sulphurous gas products were analysed by mass spectrometry (TG-MS) and gas chromatography (GC). Based on the catalysis of the active components in clay, cement and ash, the reaction rate of CaSO 4 with coal was improved by the active materials. However, the side reaction generating the sulphurous gas was severe in both the reduction and oxidation stages, especially when using steam as the gasifying agent. To enhance the regeneration, the CaSO 4 /clay composite oxygen carrier was upgraded by adding CaO. It was demonstrated that SO 2 release can be restrained in both the reduction and oxidation stages when the mass ratio of CaO to the CaSO 4 /clay composite oxygen carrier was higher than 1. At this point, the corresponding oxygen transport capacity was about 14.1 wt%.

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Findings on the use of a Ca-based sorbent as an oxygen carrier precursor in a Chemical Looping Combustion unit

Loscertales

Cabello

Abad

et al. 2023

Fuel

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Effect of Lime Addition to CaSO 4 Oxygen Carrier in Chemical Looping Combustion

Cited by 4 publications

References 33 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

Characteristics of a CaSO₄ composite oxygen carrier supported with an active material for in situ gasification chemical looping combustion of coal

Findings on the use of a Ca-based sorbent as an oxygen carrier precursor in a Chemical Looping Combustion unit

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Effect of Lime Addition to CaSO 4 Oxygen Carrier in Chemical Looping Combustion

Cited by 4 publications

References 33 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

Characteristics of a CaSO4 composite oxygen carrier supported with an active material for in situ gasification chemical looping combustion of coal

Findings on the use of a Ca-based sorbent as an oxygen carrier precursor in a Chemical Looping Combustion unit

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Product

Resources

About

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

Characteristics of a CaSO₄ composite oxygen carrier supported with an active material for in situ gasification chemical looping combustion of coal