Influence of steam in carbonation stage on CO 2 capture by Ca-based industrial waste during calcium looping cycles

He, Zirui; Li, Yingjie; Ma, Xiaotong; Zhang, Wan; Chi, Changyun; Wang, Zeyan

doi:10.1016/j.ijhydene.2016.01.029

Cited by 35 publications

(14 citation statements)

References 55 publications

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“…(b) and (c), a shift to the highest binding energy of Ca 2p and O 1s in C‐Mn‐CaO was found, which was not observed in the original CaO. It means that it was easier for the Ca atom and O atom in C‐Mn‐CaO to give electrons to CO 2 than the original CaO, which assisted the fast formation of CO 3 . The doping of Mn in CaO was beneficial to the electron transport from CaO to CO 2 , which accelerated the carbonation rates of CaO.…”

Section: Resultsmentioning

confidence: 93%

“…Usually, the flue gases from coal‐fired power plants flowing into the carbonator contain 5–15% steam. Many researchers found that steam in carbonation improved the CO 2 capture capacities of calcium‐based sorbents . He et al .…”

Section: Introductionmentioning

confidence: 99%

“…Many researchers found that steam in carbonation improved the CO 2 capture capacities of calcium‐based sorbents . He et al . found that the carbonation conversions of the carbide slag carbonated in the presence of steam were higher than those in the absence of steam because the diffusion of O 2− was accelerated by steam in the carbonation, which helped to increase the carbonation rate of CaO.…”

Section: Introductionmentioning

confidence: 99%

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A study of the synergistic effects of Mn/steam on CO₂ capture performance of CaO by experiment and DFT calculation

Wan

et al. 2019

Greenhouse Gases

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Novel Mn‐doped CaO was prepared by the combustion method. The CO2 capture performance of Mn‐doped CaO, carbonated in the presence of steam and under severe calcination conditions (950°C and 70% CO2/30% N2) during calcium looping cycles, was investigated in a dual fixed‐bed reactor. The intercoupling effects of Mn and steam on CO2 capture by CaO were also studied. Doping of Mn in CaO by the combustion method greatly improved the CO2 capture capacity of CaO. The carbonation conversions of Mn‐doped CaO increased with increasing steam concentration from 0 to 15%. When the molar ratio of Mn/Ca was 0.75 : 100, Mn‐doped CaO achieved the highest CO2 capture capacity. Under severe calcination conditions, the carbonation conversion of Mn‐doped CaO, where the molar ratio of Mn to Ca = 0.75 : 100 in the presence of 15% steam, was about 0.4 after ten cycles (carbonation for 5 min at 650°C under 15% CO2/15% steam/N2), which was 4.38 times as high as that of the original CaO in the absence of steam. The cyclic CO2 capture capacities of CaO were improved by Mn and steam. Synergistic enhancement effects of Mn and steam on the CO2 capture capacities of CaO were also found. The effect of steam on the carbonation conversion of Mn‐doped CaO was stronger than that of the original CaO. Mn in the presence of steam showed a more positive effect on CO2 capture by CaO. X‐ray photoelectron spectroscopy analysis showed that doping of Mn in CaO enhanced the transport of electrons in the carbonation of CaO, which helped to increase the carbonation rate. When steam was present in the carbonation, Mn‐doped CaO possessed a more porous structure and smaller CaO grains than the original CaO during the cycles. Simulation calculations using periodic density functional theory (DFT) showed that CO2 molecules were easier to absorb on CaO owing to the doping of Mn and the presence of steam. The synergistic enhancement effects of Mn and steam on CO2 captured the performance of CaO. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A study of the synergistic effects of Mn/steam on CO₂ capture performance of CaO by experiment and DFT calculation

Wan

et al. 2019

Greenhouse Gases

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“…The total flow rates of both the reactions were fixed at 1 l/min. As discussed in the introduction, the absence of H 2 O can improve the reaction rates in both calcination and carbonation reactions . Besides, more drastic conditions (the presence of CO 2, >900 °C) would be required in a system that is able to produce a concentrated CO 2 stream.…”

Section: Methodsmentioning

confidence: 99%

“…Besides, the calcium‐based sorbent also appears to be promising to remove HCl in the CCCR process . Steam exhibits a two‐side effect on the carbonation performance of the calcium‐based sorbent, and the effect of a high steam concentration on carbonation conversion is higher . Compared with the amine oxide washing technique and oxygen‐enriched combustion technology, the CCCR process has the advantage of superior economy, which makes it readily applicable to most of existing coal‐fired power plants.…”

Section: Introductionmentioning

confidence: 99%

Performance study of modified calcium magnesium acetate (MCMA) in the process of high temperature CO₂ capture and the application of spent MCMA for sequential SO₂ removal

Sun

Fang

Zhang

et al. 2017

Asia-Pacific J Chem Eng

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The modified calcium magnesium acetate (MCMA) has the similar characteristics and properties to those of CMA and a lower production cost. In this study, the effect of temperature on the performance of MCMA in the cyclic calcination/carbonation reaction (CCCR) process was investigated. The pore structure characteristics of the spent MCMA particles were also studied. A tubular furnace reactor was used to study the sulfation reaction characteristics and kinetic characteristics of the spent MCMA after CCCR. The microstructure and the constituent elements of the spent MCMA after sulfation reaction were analyzed by the scanning electron microscopy (SEM) and the energy dispersive X-ray spectrometry (EDS). The adsorption characteristics of MCMA were found similar to the analytically pure CMA in the CCCR process. The carbonation conversion of MCMA decreases significantly first and then varies little with increasing the cycle numbers. The sulfation process of all spent MCMA can be divided into two distinct stages including the chemical reaction-controlled stage and the product layer diffusion-controlled stage. The shrinking unreacted core model is appropriate to analyze the sulfation kinetic characteristics of the spent MCMA in the sulfation process. The sulfation conversions of the spent MCMA decrease gradually with increasing the cycle numbers of CCCR, while the MCMA-30 (the modified CMA cycled 30 times in the CCCR process) still shows a sulfation conversion of 35.48%, indicating that the spent MCMA can be used as an ideal desulfurizer before the fresh sorbent serving as a CO 2 carrier in the CCCR process.

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CO2 capture and sequestration by sodium humate and Ca(OH)2 from carbide slag

et al. 2018

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Influence of steam in carbonation stage on CO 2 capture by Ca-based industrial waste during calcium looping cycles

Cited by 35 publications

References 55 publications

A study of the synergistic effects of Mn/steam on CO₂ capture performance of CaO by experiment and DFT calculation

A study of the synergistic effects of Mn/steam on CO₂ capture performance of CaO by experiment and DFT calculation

Performance study of modified calcium magnesium acetate (MCMA) in the process of high temperature CO₂ capture and the application of spent MCMA for sequential SO₂ removal

CO2 capture and sequestration by sodium humate and Ca(OH)2 from carbide slag

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Influence of steam in carbonation stage on CO 2 capture by Ca-based industrial waste during calcium looping cycles

Cited by 35 publications

References 55 publications

A study of the synergistic effects of Mn/steam on CO2 capture performance of CaO by experiment and DFT calculation

A study of the synergistic effects of Mn/steam on CO2 capture performance of CaO by experiment and DFT calculation

Performance study of modified calcium magnesium acetate (MCMA) in the process of high temperature CO2 capture and the application of spent MCMA for sequential SO2 removal

CO2 capture and sequestration by sodium humate and Ca(OH)2 from carbide slag

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Product

Resources

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A study of the synergistic effects of Mn/steam on CO₂ capture performance of CaO by experiment and DFT calculation

A study of the synergistic effects of Mn/steam on CO₂ capture performance of CaO by experiment and DFT calculation

Performance study of modified calcium magnesium acetate (MCMA) in the process of high temperature CO₂ capture and the application of spent MCMA for sequential SO₂ removal