Effect of flue gas components on the adsorption of sulfur oxides on CaO(1 0 0)

Galloway, Benjamin D.; Padak, Bihter

doi:10.1016/j.fuel.2017.02.057

Cited by 21 publications

(12 citation statements)

References 65 publications

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“…The lattice constant of a CaO unit cell with a cubic structure (225 Fm‐3 m space group) was 4.833 Å after geometric optimization. The surface of the CaO (1 0 0), which is the most stable low‐index CaO surface, was selected to study the CO 2 capture characteristic of CaO, as shown in Fig. (a).…”

Section: Resultsmentioning

confidence: 99%

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: 99%

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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“…When limitations exist in terms of coal property, modification space, or treatment for ABS deposition in air preheaters, SO 3 -specific removal techniques that involve powdered or slurry alkaline sorbents (e.g., those containing calcium, magnesium, or sodium) can be applied (Wolf and Seaba, 2012;Galloway and Padak, 2017;Zheng et al, 2020). This approach can be employed along with existing environmental facilities capable of synergistic SO 3 removal to meet SO 3 emission standard.…”

Section: Analysis Of So3 Control Routesmentioning

confidence: 99%

An Investigation of SO3 Control Routes in Ultra-low Emission Coal-fired Power Plants

Yang

Zheng

Liu

et al. 2019

Aerosol Air Qual. Res.

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With the implementation of ultra-low emission systems in coal-fired power plants in China, the emission of sulfur trioxide (SO 3 ) has become an important issue in pollution control. However, systematic research and evaluation of SO 3 control routes based on the existing ultra-low emission systems are still lacking. We assigned 148 coal-fired power plants to four categories based on their ultra-low emission control routes and selected a representative power plant from each category for comprehensive field testing. The results indicated great variability in the synergistic SO 3 removal capability of different air pollution control devices and routes, resulting in removal efficiencies that ranged from 27% to 94%. Control Route 1, which lacked both a low-low temperature electrostatic precipitator (LLTESP) and a wet electrostatic precipitator (WESP), exhibited the lowest removal efficiency. The two routes equipped with either an LLTESP or a WESP (Control Routes 2 and 3) reduced the SO 3 concentration in the flue gas produced by medium-sulfur-coal combustion to below 10 mg m -3 , whereas Control Route 4, which utilized both an LLTESP and a WESP, reduced the SO 3 concentration to below 5 mg m -3 . Furthermore, sampling the emissions of the 148 power plants revealed that only 14% of the power plants complied with the 5 mg m -3 standard for SO 3 , although 44% and 64% of them complied with the 10 mg m -3 and the 20 mg m -3 standard, respectively. Our study evaluated the control routes within the context of the whole process, which can guide subsequent research and engineering practices.

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“…The CaO (1 0 0) surface is used to study the CO2 capture characteristics of CaO, since this surface is the most stable low-index CaO surface, as discussed by Tao et al [40] and Galloway et al [41].…”

Section: Simulation Calculations On the Interactions Between Support mentioning

confidence: 99%

CO2 capture performance of calcium-based synthetic sorbent with hollow core-shell structure under calcium looping conditions

Duan

et al. 2018

Applied Energy

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A novel calcium-based synthetic CO2 sorbent with hollow core-shell structure was prepared by a carbon microsphere template route where carbide slag, alumina cement and glucose were employed as the low-cost calcium precursor, support and carbon source, respectively. The effects of the alumina cement addition, the pre-calcination temperature during the preparation process, the carbon template addition and calcination conditions on CO2 capture performances of the calcium-based synthetic sorbents were studied during calcium looping cycles. The synthetic sorbent containing 5 wt.% alumina cement possesses the highest CO2 capture capacity during calcium looping cycles, which is mainly composed of CaO and Ca12Al14O33. The CO2 capture capacities of the synthetic sorbent under mild and severe calcination conditions can retain 0.37 and 0.29 g/g after 20 cycles, which are 57% and 99% higher than those of carbide slag under the same conditions, respectively.

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Effect of flue gas components on the adsorption of sulfur oxides on CaO(1 0 0)

Cited by 21 publications

References 65 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

An Investigation of SO3 Control Routes in Ultra-low Emission Coal-fired Power Plants

CO2 capture performance of calcium-based synthetic sorbent with hollow core-shell structure under calcium looping conditions

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Effect of flue gas components on the adsorption of sulfur oxides on CaO(1 0 0)

Cited by 21 publications

References 65 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

An Investigation of SO3 Control Routes in Ultra-low Emission Coal-fired Power Plants

CO2 capture performance of calcium-based synthetic sorbent with hollow core-shell structure under calcium looping conditions

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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