Retention of trace elements in coal-fired flue gas by a novel heterogeneous agglomeration technology

Ji, Yushan; Cui, Xiangzheng; Liu, Jingchao; Zhang, Tianle; Wei, Shuzhou; Zhang, Junfeng; Zhao, Yongchun; Zhang, Junying

doi:10.1016/j.jes.2021.12.039

Cited by 10 publications

(2 citation statements)

References 35 publications

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“…The final emission concentrations of As t , Se t , and Pb t do not exceed 0.17, 0.67, and 4.23 μg/m 3 respectively, which are lower than the emission limits (As ≤ 2.7 μg/m 3 and Se ≤ 8.2 μg/m 3 ) issued by the US Environmental Protection Agency (EPA) in 2012. The emission state of Pb (PbCl 2 , PbSO 4 ...) is fine or ultrafine particulate, 77,78 and the concentration was also very low, which demonstrates that TEs in flue gas from this coal-fired power plant with SCR + ESP + SWFGD + WESP have almost been captured. The flue gas after flowing through these APCDs has a little TE content and can be discharged into the atmosphere.…”

Section: Resultsmentioning

confidence: 99%

Synergistic Removal Effects of Ultralow Emission Air Pollution Control Devices on Trace Elements in a Coal-Fired Power Plant

et al. 2022

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The effects of air pollution control devices (APCDs) such as selective catalytic reduction systems, electrostatic precipitators (ESPs), seawater desulfurization (SWFGD) units, and wet ESPs (WESP) on the ultralow emissions of trace elements (TEs) in a 300 MW pulverized coal boiler system are studied to reveal the removal of TEs (As, Se, and Pb) in these facilities. The results show that the average synergistic removal efficiencies of As, Se, and Pb in the studied power plant are 97.26, 94.07, and 95.49%, respectively. The emission concentration of As, Se, and Pb did not exceed 0.17, 0.67, and 4.23 μg/m3, respectively. ESPs can capture a great part of As and Pb; most of the Se is removed in the SWFGD system and WESP. The flue gas temperature decreasing in the air preheater (APH) and flue gas cooling system facilitates particulate TE removal in the ESP. Seawater in the SWFGD system promotes the dissolution and removal of unfilterable TEs, making the SWFGD system more efficient than conventional WFGDs under some working conditions. The influence of the boiler load and sulfur content of coals on the migration and transformation characteristics of TEs has also been systematically studied. Burning coal with a higher sulfur content can improve the synergistic removal of Pb, and working under a low boiler load is beneficial to the synergistic removal of As, Se, and Pb by APCDs of power plants. Hopefully, this study can provide a reference for the removal of TEs under various operating conditions in power plants with different APCDs.

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Section: Resultsmentioning

confidence: 99%

Synergistic Removal Effects of Ultralow Emission Air Pollution Control Devices on Trace Elements in a Coal-Fired Power Plant

et al. 2022

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“…Particles with an aerodynamic diameter of less than 2.5 μm (PM2.5) not only adsorb toxic substances and travel to the lungs easily but also reduce visibility significantly by scattering and absorption. 1 Moreover, with rapid economic development, industrial emissions have received worldwide attention.…”

Section: Introductionmentioning

confidence: 99%

Pilot-Scale Investigation on a Spraying Pretreatment Process Integrated with an Axial Flow Cyclone to Separate Fine Particles with Low Energy Consumption

Wang,

Song,

Liu

et al. 2023

Ind. Eng. Chem. Res.

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This study was designed to explore the synergistic enhancement of the spraying pretreatment section and axial flow cyclone on the separation of particles from gases. First, in the spraying pretreatment section, the effects of the gas flow rate, droplet flow rate, droplet diameter, and gas or droplet temperature on the collection efficiency of the particles and the supersaturation degree were analyzed. Then, the nucleation and growth process of fine insoluble particles were discussed. At last, combined with an axial flow cyclone, the influences of operating parameters on the separation efficiency and energy consumption were presented. Our results show that the spraying pretreatment can capture 80% of particles larger than 5 μm and can maintain a supersaturated environment. Fine particles (PM1.0) will be aggregated to above 6 μm quickly and removed in the axial flow cyclone with a separation efficiency of above 98%. In addition, the energy consumption of the integrated purification process in this study is reduced by 20.65%, on average, compared to that of an electrostatic precipitator. These findings provide new insights into the separation of fine particles in industrial applications.

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A review of arsenic reaction behavior in copper smelting process and its disposal techniques

Li,

Yan

et al. 2023

J. Cent. South Univ.

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Retention of trace elements in coal-fired flue gas by a novel heterogeneous agglomeration technology

Cited by 10 publications

References 35 publications

Synergistic Removal Effects of Ultralow Emission Air Pollution Control Devices on Trace Elements in a Coal-Fired Power Plant

Synergistic Removal Effects of Ultralow Emission Air Pollution Control Devices on Trace Elements in a Coal-Fired Power Plant

Pilot-Scale Investigation on a Spraying Pretreatment Process Integrated with an Axial Flow Cyclone to Separate Fine Particles with Low Energy Consumption

A review of arsenic reaction behavior in copper smelting process and its disposal techniques

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