Forward ultra-low emission for power plants via wet electrostatic precipitators and newly developed demisters: Filterable and condensable particulate matters

Liang, Yingguang; Li, Qing; Ding, Xiang; Wu, Di; Wang, Yafei; Otsuki, Tetsuya; Cheng, Yi; Shen, Tianxiao; Li, Shuya; Chen, Jianmin

doi:10.1016/j.atmosenv.2020.117372

Cited by 45 publications

(6 citation statements)

References 36 publications

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“…The two tested sintering machines, iron ore smelting processes of with coal as fuel typical in the steel industry, exhibit an area of 360 m 2 with installed ESP, limestone (sinter #1)/ammonia-based WFGD (sinter #2), and WESP units. The tested utility/industrial boilers, sintering areas, installed APCDs and fuel properties are detailed in Table S1 and our previous studies (Ding et al, 2019(Ding et al, , 2020Liang et al, 2020).…”

Section: Sampling Unitsmentioning

confidence: 99%

Direct Observation of Sulfate Explosive Growth in Wet Plumes Emitted From Typical Coal‐Fired Stationary Sources

Ding

et al. 2021

Geophysical Research Letters

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Sulfate (SO 4 2−) has been recognized as a key and major component of fine particulate matter (PM) with an aerodynamic diameter of 2.5 µm or smaller (PM 2.5) in the atmosphere, especially during severe haze events (Cheng et al., 2016; Huang et al., 2014; Shah et al., 2018). SO 4 2− directly impacts the solar radiative balance and the physicochemical properties of aerosols (Tsigaridis & Kanakidou, 2018). Ground-based observations from 2005 to 2014 have revealed that the averaged proportions of sulfate in the atmospheric PM 2.5 mass are 15% ± 6% and 20% ± 5% in northern and southern China, respectively (Zhang et al., 2017). The SO 4 2− concentration has been intensively studied via modeling by mainly focusing on its formation through atmospheric SO 2 oxidation (secondary formation) to determine a sufficient chemical production mechanism (R. Zhang et al., 2015). However, a knowledge gap (also referred to as missing sulfate) remains in regards to our understanding of the sources and formation pathways of high SO 4 2− concentrations, especially during Chinese winter haze periods (

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Section: Sampling Unitsmentioning

confidence: 99%

Direct Observation of Sulfate Explosive Growth in Wet Plumes Emitted From Typical Coal‐Fired Stationary Sources

Ding

et al. 2021

Geophysical Research Letters

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“…The CPM collection trains were immediately purged with high‐purity N 2 (≥99.9%, flow rate of 15 L/min) for 90 min to remove soluble gases (Cl Inorganic gases , SO 2 , and NO 2 ) to the Cl Inorganic gases absorption liquid after sampling. Ultrapure water and organic solvent (acetone and hexane) were then used to rinse each part before the CPM filter holders twice in sequence, as detailed in our previous study (Liang et al, 2020).…”

Section: Methodsmentioning

confidence: 99%

Gaseous and Particulate Chlorine Emissions From Typical Iron and Steel Industry in China

Ding

et al. 2020

JGR Atmospheres

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The accurate estimation of chlorine emissions is urgently needed to evaluate regional and global atmospheric chlorination. This study first reports on the gaseous/particulate phases of chlorine emissions from typical integrated steel industries, including the major manufacturing processes (i.e., sintering, ironmaking, and steelmaking) and self‐owned coal‐fired power plant (CFPP). The concentration of chlorine species emitted from the ironmaking/steelmaking processes and the self‐owned CFPP is very low (<1 mg/Nm3). Owing to the combustion of chlorine‐rich sinter raw materials, the sintering processes emitted unexpectedly high concentrations of chlorinated substances, including chlorinated very short‐lived CH3Cl, CH2Cl2, C2H5Cl, and C2H4Cl2. Flue gas desulfurization (FGD) systems equipped on the sintering processes can slightly reduce chlorinated hydrocarbons emissions (ClVOCs). However, the chlorine species bonded in filterable/condensable particulate states (ClFPM/ClCPM) can be removed by high efficient systems (with efficiencies of 64.8–94.1% for ClFPM and 97.3–98.5% for ClCPM), relying on employed FGD technology. Owing to rapid rate at which FGD systems have been installed in China, ClInorganic gases, ClCPM, and ClFPM emissions from the sintering and iron industry in 2016 were reduced by 75.3%, 82.7%, and 45.6%, respectively. Our results indicate that the current ultralow‐emission equipment facilitates the reduction in chlorine emissions from iron and steel industry, but subsequent retrofits should give greater consideration to the simultaneous removal of ClVOCs.

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“…Huang Y, Zheng C, Li Q, et al, 2020. Numerical simulation of the simultaneous removal of particulate…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…The PM emission concentration can be reduced below 10 mg m -3 with LLTESPs and EFFs and even below 5 mg m -3 with the further assistance of highly efficient demisters equipped at the wet flue gas desulfurization tower (WFGD) (Huang et al, 2020). However, the stability of ultralow emission under such conditions strongly depends on the demister performance (Liang et al, 2020). WESP is typically arranged at downstream of the WFGD to remove the slurry droplets, fly ashes, and acid mists with an overall efficiency >90% (Zheng et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Developing a Compact Particle Collector by Integrating a Wet Electrostatic Precipitator and an Inertia Mist Eliminator

Yang

Qiu²,

Zhou

et al. 2021

Aerosol Air Qual. Res.

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Wet electrostatic precipitator (WESP) is a reliable alternative to realize the ultralow emission of particulate matter from coal-fired power plants. This work proposes to develop a compact particle collector by integrating a WESP and an inertia mist eliminator (IME). The particle collection efficiency and charging characteristics of the WESP were analyzed to determine the potential for compact design. Results show that the WESP was easy to achieve a collection efficiency of 95% for both pin and wire electrodes. Particle charging can still be guaranteed with short WESP length and high voltage, indicating the particle charging was sensitive to electrical parameters. Charges carried by the escaping particles acted as a bridge between the WESP and the IME. The collision enhanced by particle charging can lead to an improvement in overall efficiency and charge loss. The particle charge loss of the particle sized 7.29 μm was 22.6% and 29.4% for the one and two stage IME, which coincided with the efficiency enhancement of WESP. The collection efficiency significantly decreased as the WESP size decreased, but the collection efficiency can be enhanced by the combination with IME. The 6-wire WESP enhanced by one-stage IME can be considered the optimal combination because the WESP size can be shorten by 40% while maintaining a similar efficiency. The research findings are beneficial for the retrofit of air pollution control devices in limited space.

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Forward ultra-low emission for power plants via wet electrostatic precipitators and newly developed demisters: Filterable and condensable particulate matters

Cited by 45 publications

References 36 publications

Direct Observation of Sulfate Explosive Growth in Wet Plumes Emitted From Typical Coal‐Fired Stationary Sources

Direct Observation of Sulfate Explosive Growth in Wet Plumes Emitted From Typical Coal‐Fired Stationary Sources

Gaseous and Particulate Chlorine Emissions From Typical Iron and Steel Industry in China

Developing a Compact Particle Collector by Integrating a Wet Electrostatic Precipitator and an Inertia Mist Eliminator

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