Release characteristics of mercury in chemical looping combustion of bituminous coal

Ji, Ling; Wang, Qianwen; Zhang, Zhiyue; Hao, W.; Zhou, Can; Yang, Hongmin

doi:10.1016/j.jes.2020.03.017

Cited by 13 publications

(14 citation statements)

References 35 publications

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“…83 It is also reported that, within the temperature range of 800−950 °C, when the volume ratio of H 2 O/CO 2 increases from 0:1 to 1:1, the proportion of Hg 0 among the total Hg species increases gradually (seen in Figure 6a). 34 A higher H 2 O fraction is unfavorable for mercury oxidation in the FR. The adverse impact of H 2 O on mercury oxidation is also attributed to the inhibition to the conversion from Cl to Cl 2 .…”

Section: Factors Influencing Mercury Migration In the Clc Systemmentioning

confidence: 99%

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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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Section: Factors Influencing Mercury Migration In the Clc Systemmentioning

confidence: 99%

“…As a result, the release characteristics of mercury will be influenced. Ji et al found that a higher ratio of H 2 O/CO 2 is favorable for the release of mercury in the CLC system . Moreover, the reducing species with high concentrations in the FR will affect the oxidation of elemental mercury.…”

Section: Introductionmentioning

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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“…It was found that most of the mercury in coal was released in FR, and the rest was released in AR. In particular, Hg 0 is the main species of released mercury . However, with the increase of FR temperature, the amount of Hg 0 may decrease and the amount of Hg 2+ may increase.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, Hg 0 is the main species of released mercury. 20 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%

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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“…The mercury released in the air reactor was originated from the reduced oxygen carrier and residual char. Ji et al 43 found that the release of mercury in the air reactor was about 10% of the total mercury.…”

Section: Introductionmentioning

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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Release characteristics of mercury in chemical looping combustion of bituminous coal

Cited by 13 publications

References 35 publications

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

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

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

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Release characteristics of mercury in chemical looping combustion of bituminous coal

Cited by 13 publications

References 35 publications

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

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

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

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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