Upcycling coal liquefaction residue into sulfur-rich activated carbon for efficient Hg0 removal from coal-fired flue gas

Chen, Huijun; Huo, Qihuang; Wang, Yahui; Han, Lupeng; Lei, Zhiping; Wang, Jiancheng; Wang, Bao; Chang, Liping

doi:10.1016/j.fuproc.2020.106467

Cited by 28 publications

(9 citation statements)

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“…The LCVCs have higher content of mineral than usual coal, and the Hg content in LCVCs is also greater than that in usual coal [ 14 ]. As a result, the Hg emission behaviour from LCVCs combustion will possibly be much different to that from coal combustion.…”

Section: Introductionmentioning

confidence: 99%

Release characteristics of elemental mercury during low calorific value coal combustion

Gao

Guo

et al. 2022

R. Soc. open sci.

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The dynamic release characteristics of Hg 0 during low calorific value coal combustion were investigated in a combining laboratory-scale furnace coupled with atomic fluorescence spectroscopy. The results show that the sulfur has an inhibitory effect on the homogeneous oxidation of Hg 0 in flue gas. The instant intensity of Hg 0 release increases with increasing temperature while the amount of Hg 0 release gradually decreases with increasing temperature. Compared with that under air, the instant intensity of Hg 0 release under O 2 /CO 2 atmosphere increases to some extent with a lower decreasing rate of Hg 0 release peak. The release ratio of elemental mercury (Hg) from Yuwu (YW) and Qinxin (QX) coal increases while that from Yonghao (YH) coal decreases under O 2 /CO 2 atmosphere. In the range of 800–1100°C, the release rate of Hg reaches more than 96% under the residence time of 50 s.

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Section: Introductionmentioning

confidence: 99%

Release characteristics of elemental mercury during low calorific value coal combustion

Gao

Guo

et al. 2022

R. Soc. open sci.

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“…17 often used to add active sites on AC to improve its Hg 0 removal ability. 18 Sulfur impregnation has been verified to considerably enhance the capacity of AC adsorbents to adsorb Hg 0 . 19,20 Zhu et al 21 proposed the use of sulfurimpregnated activated petroleum coke for mercury adsorption and demonstrated its high efficiency in mercury removal.…”

Section: Introductionmentioning

confidence: 99%

“…The study shows that the sulfur-impregnated AC fibers can effectively improve the sulfur-containing functional groups on the surface of the ACFs and increase the chemical active sites for mercury removal. Chen et al 18 indicated that coal liquefaction residue was a potential sorbent for synthesizing highly efficient sulfur-modified AC for Hg 0 removal from flue gas. In many preparation methods, porous materials with a high specific surface area were sulfurized using SO 2 or H 2 S gas.…”

Section: Introductionmentioning

confidence: 99%

“…They can also provide active sites for supporting various active components, thus generating strong chemisorption . Due to the limited Hg 0 adsorption capacity of raw AC, chemical impregnation, for example, with halogens, metal oxides, and elemental sulfur, is often used to add active sites on AC to improve its Hg 0 removal ability . Sulfur impregnation has been verified to considerably enhance the capacity of AC adsorbents to adsorb Hg 0 . , Zhu et al proposed the use of sulfur-impregnated activated petroleum coke for mercury adsorption and demonstrated its high efficiency in mercury removal.…”

Section: Introductionmentioning

confidence: 99%

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Regeneration Characteristics of Elemental Sulfur-Modified Activated Carbon for Mercury Removal

et al. 2021

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Although activated carbon doped with sulfur is considered to be effective for capturing elemental mercury from coal-fired flue gas, sorbent regeneration is more important for application in cycles. In this study, thermal elemental sulfur-loading methods were used both to modify activated carbon and to renew the used sorbent to remove mercury. The effects of sulfur-loading dosage, adsorbent inactivation, and regeneration on mercury removal performance were investigated, and the optimal conditions for preparing the regenerative adsorbent were determined. Various analytical techniques including Brunauer–Emmett–Teller analysis, X-ray photoelectron spectroscopy, scanning electron microscopy/energy-dispersive X-ray spectroscopy, and Fourier transform infrared spectroscopy were used to characterize the physicochemical properties of the samples for exploring the mechanisms of mercury adsorption. The results showed that adsorbents under optimal preparation conditions reached the most outstanding performance of the Hg0 breakthrough rate of lower than 8.58% at 150 °C. By comparing the samples before and after adsorption, changes on the sorbent surface of morphology and elemental composition were observed. The decrease in oxygen and sulfur contents of the deactivated adsorbent was the main reason for its deactivation. From the desorption curve of the saturated samples of the adsorbent, the optimal regeneration method of the adsorbent was determined. The cyclic mercury removal rates of the recovered adsorbents were 80.22, 81.75, 79.43, and 72.96% during regeneration cycles. The elemental sulfur-modified activated carbon with thermally renewable sulfur-loading exhibited not only an efficient mercury removal rate but also excellent regeneration characteristics.

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“…In addition, previous studies pay more attention on using better sorbent to remove heavy metals from flue gas. Some studies have reported that active carbon (AC) material also has a positive RE on heavy metals from flue gas, − and then the FF can further capture the heavy metals adsorbed in AC and particles. Chen et al have studied the controlling efficiency of four sorbents for heavy metals, which follow a decreasing sequence of limestone, water, kaolinite, and aluminum oxide .…”

Section: Introductionmentioning

confidence: 99%

Field Study on the Emission Characteristics of Micro/Trace Pollutants and Their Correlations from Medical Waste Incineration

Lin

Chen

et al. 2020

Energy Fuels

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This study is carried out in a full-scale (1.25 t/h) medical waste incinerator (MWI), focusing on reduction characteristics of different air pollution control devices (APCDs) on trace pollutants [polychlorinated dibenzodioxins and dibenzofurans (PCDD/F)] and micropollutants (heavy metals) in flue gas. The APCD system effectively reduces the PCDD/F concentration to 5.32 ng/Nm3 (0.07 ng I-TEQ/Nm3 for toxic PCDD/F) with a removal efficiency of 87.95% (90.86% for toxic PCDD/F). The 2,3,4,7,8-PeCDF is the biggest contributor of toxic PCDD/F at each sampling site. The APCDs obviously influence the isomer distribution but do not change the dominant position of major isomers, and the proportion of PCDF is continuously decreased by different APCDs. The fabric filter coupled with active carbon injection (FF + ACI) removes 75.45% PCDD/F (94.81% for toxic PCDD/F) from flue gas and shows obviously higher removal efficiency on the PCDD/F congeners chlorinated in both 7 and 8 positions compared to other congeners. In addition, FF + ACI can also effectively remove most heavy metals from flue gas other than Hg. However, the memory effects of PCDD/F and Hg are observed at wet scrubbers in this study. Cr and As might have the potential to be indicators of PCDD/F according to their excellent correlation with PCDD/F concentrations. The results can benefit controlling the emissions of PCDD/F and heavy metals from MWI and give guidance to the other MWI plants.

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Upcycling coal liquefaction residue into sulfur-rich activated carbon for efficient Hg0 removal from coal-fired flue gas

Cited by 28 publications

References 50 publications

Release characteristics of elemental mercury during low calorific value coal combustion

Release characteristics of elemental mercury during low calorific value coal combustion

Regeneration Characteristics of Elemental Sulfur-Modified Activated Carbon for Mercury Removal

Field Study on the Emission Characteristics of Micro/Trace Pollutants and Their Correlations from Medical Waste Incineration

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