Fate of Mercury in Volatiles and Char during in Situ Gasification Chemical-Looping Combustion of Coal

Ma, Jinchen; Mei, Daofeng; Tian, Xin; Zhang, Shibo; Yang, Jianping; Wang, Chaoquan; Chen, Guoping; Zhao, Yongchun; Zheng, Chenghang; Zhao, Haibo

doi:10.1021/acs.est.8b06931

Cited by 41 publications

(30 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mercury emissions are usually considered to cause environmental and health risks. Hg is a highly volatile toxic element that has the risk of accumulating in plant and animal tissue 64 . Existing investigations suggested that mercury emission largely relied on the temperature and Hg content in the fuel 47 .…”

Section: Resultsmentioning

confidence: 99%

“…Hg is a highly volatile toxic element that has the risk of accumulating in plant and animal tissue. 64 Existing investigations suggested that mercury emission largely relied on the temperature and Hg content in the fuel. 47 spectrometry (LA-ICP-MS) results of herbal residue fuel, and the result suggested Hg was not found in the herbal residue with its content beyond the lower limit of detection.…”

Section: Pollution Emission Analysismentioning

confidence: 99%

See 1 more Smart Citation

Co‐use of organic herbal residue and red mud waste for syngas production by chemical looping gasification

Liu

Zhang

et al. 2020

Int J Energy Res

View full text Add to dashboard Cite

Summary Tremendous amounts of organic residue from manufacturing herbal medicines and inorganic red mud waste from mining bauxite ores are landfilled each year in China. To study the potential for their beneficial co‐use, chemical looping gasification (CLG) was tested in which the organic residue was used as the fuel and the red mud was the oxygen carrier that is needed for CLG. Parametric testing was performed using a thermo‐gravimetric analyzer and a bench‐scale fluidized bed reactor to optimize CLG operations that could maximum syngas production, enrich H2 concentrations and obtain effective conversion of the residue. Physical and chemical characterization of the organic residue and red mud before and after CLG testing showed that some filamentous ash from the organic residue remained on the surface after testing, and potassium from the organic residue migrated onto the surface of the oxygen carrier. The characterization and testing results suggested that CLG may be an advantageous technology to effectively convert an organic waste into syngas and an inorganic waste into a usable product, thereby establishing an approach for beneficial waste resource utilization.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Pollution Emission Analysismentioning

confidence: 99%

Co‐use of organic herbal residue and red mud waste for syngas production by chemical looping gasification

Liu

Zhang

et al. 2020

Int J Energy Res

View full text Add to dashboard Cite

show abstract

“…Also, it is low-priced as compared to other reserves. Renewable energy sources and nuclear energy have some limitations when they are used in large scale due to some hazards and are not favorable to fulfilling energy demands in the future. , The costs of renewable energy sources will decrease compared to production cost due to the use of advanced technologies, in 2030, but it is expected that only 13.3% of energy consumption will be from renewable sources …”

Section: Introductionmentioning

confidence: 99%

Recent Advances and Development of Various Oxygen Carriers for the Chemical Looping Combustion Process: A Review

Qasim

Ayoub

Ghazali

et al. 2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The amount of CO 2 in the atmosphere is rising due to the combustion of fossil fuels to fulfill the energy demand. The need to build cleaner and more efficient energy systems is motivated by the introduction of chemical looping combustion (CLC) as an alternative to conventional combustion by transferring oxygen. The transfer of oxygen from the air to fuel is carried out by a metal oxide known as an oxygen carrier (OC). For high fuel conversion and oxygen transport capacity, many efforts have been made for the preparation of an OC with minimal material cost. This review aims to summarize the recent advances and development of various types of OCs; particularly those developed within the previous five years are critically discussed in this paper. The main criteria for the selection of the OCs for CLC include their oxygen vacancies, oxygen transport capacities, costs, and tendencies over coke deposition, agglomeration, and attrition. OCs for CLC can be generally divided into single oxides, mixed oxides, natural mineral, spinel from mixed metal oxides, and perovskite. These have been critically discussed with their significance in CLC. The performances, advantages, and limitations of the OCs are presented and compared in detail.

show abstract

“… 18 Ma et al found that in the presence of hematite in the FR, the concentration of Hg 0 decreased and the concentration of Hg 2+ increased, indicating that hematite promoted the conversion of Hg 0 to Hg 2+ . 19 Only a small amount of mercury was adsorbed by the OC and transported to the AR together with the carbon residue, which was released in the form of Hg 0 (g) and Hg 2+ (g) or left in OC and coal ash in the form of Hg P . Ji et al used ferrous ore as OC to study the release characteristics of mercury in bituminous coal in CLC.…”

Section: Introductionmentioning

confidence: 99%

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

Liu

et al. 2022

ACS Omega

View full text Add to dashboard Cite

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.

show abstract

Fate of Mercury in Volatiles and Char during in Situ Gasification Chemical-Looping Combustion of Coal

Cited by 41 publications

References 30 publications

Co‐use of organic herbal residue and red mud waste for syngas production by chemical looping gasification

Co‐use of organic herbal residue and red mud waste for syngas production by chemical looping gasification

Recent Advances and Development of Various Oxygen Carriers for the Chemical Looping Combustion Process: A Review

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

Contact Info

Product

Resources

About