Impact of gas impurities on the Hg0 oxidation on high iron and calcium coal ash for chemical looping combustion

Liu, Zhuang; Liu, Dunyu; Jin, Jing; Feng, Lijuan; Ni, Mingguo; Zhao, Ben; Wu, Xiaojiang

doi:10.1007/s11356-020-11872-z

Cited by 9 publications

(8 citation statements)

References 68 publications

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“…Hg p formed on the surface of the oxygen carrier mainly consisted of Hg 0 and HgO, as seen in Figure . The fitting curve of Hg 4f can be divided into HgO at a binding energy of 102.14 eV and Hg 0 at a binding energy of 99.9 eV .…”

Section: Resultsmentioning

confidence: 99%

Enhancement of Elemental Mercury Oxidation by Core–Shell CuCo₂O₄@SiO₂ Oxygen Carrier with Strong Oxygen Release and Weak Adsorption Capacity in Chemical-Looping Combustion

Wang,

Liu,

et al. 2023

Energy Fuels

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Section: Resultsmentioning

confidence: 99%

Enhancement of Elemental Mercury Oxidation by Core–Shell CuCo₂O₄@SiO₂ Oxygen Carrier with Strong Oxygen Release and Weak Adsorption Capacity in Chemical-Looping Combustion

Wang,

Liu,

et al. 2023

Energy Fuels

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“…At 580− 680 °C, the adsorption of HCl on Fe 2 O 3 is severely inhibited and the promotion effect of HCl mainly results from the homogeneous oxidation between HCl and Hg 0 . The study of Liu et al 90 shows that, at 850 °C, HCl could promote the oxidation of Hg 0 by two ways. One is the direct homogeneous reaction between HCl and Hg 0 , and the other is the reaction between HCl and metal oxides in OCs (Fe 2 O 3 and CaSO 4 ) to generate many active substances and then promote the oxidation of mercury.…”

Section: Factors Influencing Mercury Migration In the Clc Systemmentioning

confidence: 99%

“…In addition, NO can promote the formation of active O, which is conducive to the conversion from Hg 0 to HgO. 90 On the contrary, CO with strong reducibility can inhibit the mercury oxidation by consuming active O, and the reason for the inhibition of mercury oxidation by H 2 and NH 3 is also the same. 48 4.4.…”

Section: Factors Influencing Mercury Migration In the Clc Systemmentioning

confidence: 99%

Review and Perspectives on Mercury Release and Migration during Chemical Looping Combustion of Solid Fuels

Lyu,

Guan,

et al. 2024

Energy Fuels

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Chemical looping combustion (CLC) is a promising technology for global carbon reduction. In the CLC system, mercury released during combustion is not only a hazardous pollutant but also a risk to the system safety because mercury can easily lead to the amalgamation and fracture of the decarbonizing equipment. Understanding the mercury release and migration characteristics is the foundation for the safe operation of the CLC system. The purpose of this study is to lay the scientific foundation for achieving deep mercury removal during the CLC of solid fuels. The mercury flow and distribution within the CLC system were discussed. The differences in mercury release between CLC and conventional combustion or gasification were analyzed. The influence mechanisms of the key factors, such as fuel type, temperature, atmosphere, and oxygen carrier, on the release and migration fate of mercury during the CLC processes were discussed. The removal mechanisms of elemental mercury in the CLC system were revealed. Finally, research perspectives on mercury control in the CLC system were proposed. This review includes a comprehensive review of the latest research progress on mercury emission control within the CLC system. The findings of this study can provide guidance for the development of the deep mercury removal technology during CLC processes and help break the bottleneck which restricts the long-term safe operation of the CLC system.

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“…However, with the increase of FR temperature, the amount of Hg 0 may decrease and the amount of Hg 2+ may increase. This can be attributed to different flue gas components. , …”

Section: Introductionmentioning

confidence: 99%

“…This can be attributed to different flue gas components. 21,22 At present, the mechanism of Hg 0 oxidation by oxygen carriers in the furnace has been reported, 23 but the effects of flue gas components produced in the gasification process on mercury transformation in the cooling stage are not clear. Certainly, oxygen carriers may have a significant influence on Hg 0 oxidation through the coal gasification process.…”

Section: Introductionmentioning

confidence: 99%

Oxygen-Induced Elemental Mercury Oxidation in Chemical Looping Combustion of Coal

Liu

et al. 2022

ACS Omega

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Mercury emission is an important issue during chemical looping combustion (CLC) of coal. The aim of this work is to explore the effects of different flue gas components (e.g., HCl, NO, SO 2 , and CO 2 ) on mercury transformation in the flue gas cooling process. A two-stage simulation method is used to reveal the reaction mechanism of these gases affecting elemental mercury (Hg 0 ) oxidation. Furthermore, using this method, Hg 0 oxidation by eight oxygen carriers (Co 3 O 4 , CaSO 4 , CeO 2 , Fe 2 O 3 , Al 2 O 3 , Mn 2 O 3 , SiO 2 , and CuO) commonly used in CLC are investigated and their Hg 0 oxidation efficiencies were compared with the existing experimental results. The results show that HCl, NO, and CO 2 promote Hg 0 oxidation during flue gas cooling, while SO 2 inhibits Hg 0 oxidation. The stronger the oxygen release capacity of oxygen carriers, the higher the oxidation efficiency of Hg 0 becomes. The order of Hg 0 removal efficiency from high to low is Co 3 O 4 , CuO, Mn 2 O 3 , CaSO 4 , Fe 2 O 3 , CeO 2 , Al 2 O 3 , and SiO 2 , and this sequence is in good agreement with the existing experimental results. Different flue gas components directly or indirectly affect the O 2 content, thus affecting the content of gaseous oxidized mercury (Hg 2+ ). Different oxygen carriers have different oxygen release capacities and different Hg 0 oxidation efficiencies. Therefore, O 2 is the core species affecting the mercury transformation in CLC.

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Impact of gas impurities on the Hg0 oxidation on high iron and calcium coal ash for chemical looping combustion

Cited by 9 publications

References 68 publications

Enhancement of Elemental Mercury Oxidation by Core–Shell CuCo₂O₄@SiO₂ Oxygen Carrier with Strong Oxygen Release and Weak Adsorption Capacity in Chemical-Looping Combustion

Enhancement of Elemental Mercury Oxidation by Core–Shell CuCo₂O₄@SiO₂ Oxygen Carrier with Strong Oxygen Release and Weak Adsorption Capacity in Chemical-Looping Combustion

Review and Perspectives on Mercury Release and Migration during Chemical Looping Combustion of Solid Fuels

Oxygen-Induced Elemental Mercury Oxidation in Chemical Looping Combustion of Coal

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Impact of gas impurities on the Hg0 oxidation on high iron and calcium coal ash for chemical looping combustion

Cited by 9 publications

References 68 publications

Enhancement of Elemental Mercury Oxidation by Core–Shell CuCo2O4@SiO2 Oxygen Carrier with Strong Oxygen Release and Weak Adsorption Capacity in Chemical-Looping Combustion

Enhancement of Elemental Mercury Oxidation by Core–Shell CuCo2O4@SiO2 Oxygen Carrier with Strong Oxygen Release and Weak Adsorption Capacity in Chemical-Looping Combustion

Review and Perspectives on Mercury Release and Migration during Chemical Looping Combustion of Solid Fuels

Oxygen-Induced Elemental Mercury Oxidation in Chemical Looping Combustion of Coal

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Enhancement of Elemental Mercury Oxidation by Core–Shell CuCo₂O₄@SiO₂ Oxygen Carrier with Strong Oxygen Release and Weak Adsorption Capacity in Chemical-Looping Combustion

Enhancement of Elemental Mercury Oxidation by Core–Shell CuCo₂O₄@SiO₂ Oxygen Carrier with Strong Oxygen Release and Weak Adsorption Capacity in Chemical-Looping Combustion