A combined wet electrostatic precipitator for efficiently eliminating fine particle penetration

Yang, Zhengda; Zheng, Chenghang; Liu, Shaojun; Guo, Yishan; Liang, Chengsi; Wáng, Yì; Hu, Daqing; Gao, Xiang

doi:10.1016/j.fuproc.2018.08.013

Cited by 61 publications

(18 citation statements)

References 30 publications

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“…Under the BAT scenario, we assumed that the maximum technically feasible control technologies would be fully applied by 2030 to realize “near zero” emissions for all units under the Power Plan. The removal efficiencies of the FGD and de-NO x devices for all units were considered to be at least 95% and 85%, respectively. , Wet electrostatic precipitators (WESPs) are expected to be widely placed into commercial use in the near future, , and they are usually installed after all regular control devices. Under the BAT scenario, all units were assumed to be equipped with additional WESPs after fabric baghouses (FABs).…”

Section: Methodsmentioning

confidence: 99%

Current Emissions and Future Mitigation Pathways of Coal-Fired Power Plants in China from 2010 to 2030

Tong

Zhang

Liu

et al. 2018

Environ. Sci. Technol.

152

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As the largest energy infrastructure in China, the power sector consumed approximately half of China's coal over the past decade and threatened air quality and greenhouse gas (GHG) abatement targets. In this work, we assessed the evolution of coal-fired power plants and associated emissions in China during 2010−2030 by using a unit-based emission projection model, which integrated the historical power plant information, turnover of the future power plant fleet, and evolution of end-of-pipe control technologies. We found that, driven by stringent environmental legislation, SO 2 , NO x , and PM 2.5 (particulate matter less than 2.5 μm in diameter) emissions from coalfired power plants decreased by 49%, 45%, and 24%, respectively, during 2010−2015, compared to 15% increase in CO 2 emissions. In contrast to everincreasing CO 2 emissions until 2030 under current energy development planning, we found that aggressive energy development planning could curb CO 2 emissions from the peak before 2030. Owing to the implementation of a "near zero" emission control policy, we projected emissions of air pollutants will significantly decrease during 2016−2030. Early retirement of small and low-efficiency power plants would further reduce air pollutants and CO 2 emissions. Our study explored various mitigation pathways for China's coal-fired power plants, which could reduce coal consumption, air pollutants, and CO 2 emissions and improve energy efficiency.

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Section: Methodsmentioning

confidence: 99%

Current Emissions and Future Mitigation Pathways of Coal-Fired Power Plants in China from 2010 to 2030

Tong

Zhang

Liu

et al. 2018

Environ. Sci. Technol.

152

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“…This result demonstrates that external effects by precharging were effective in eliminating SAA emission within the limited time. SAAs with diameters <0.018 μm depended much on Brownian coagulation rather than external electrical field effects because ultra-fine aerosols can only be partially charged …”

Section: Resultsmentioning

confidence: 74%

“…SAAs with diameters <0.018 μm depended much on Brownian coagulation rather than external electrical field effects because ultra-fine aerosols can only be partially charged. 51 Finally, Figure 7b summarizes two key indexes (i.e., mean diameter and number concentration) for characterizing SAA evolution, wherein the initial condition was set as a reference status. Compared with the initial condition, the SAA under a sufficient interaction condition showed a 53.8% increase in mean diameter and 64.6% decrease in number concentration, which implied excellent performance in SAA evolution.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Fast Evolution of Sulfuric Acid Aerosol Activated by External Fields for Enhanced Emission Control

Yang

Zheng

et al. 2020

Environ. Sci. Technol.

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Sulfuric acid aerosol (SAA) can considerably deteriorate air visibility, which poses a threat to human health. Pretreatment methods that enlarge SAA sizes are crucial to enhanced emission control from industrials. This study provides an insight into SAA growth in terms of aerosol dynamics simulation and growth experiments under simulated flue gas conditions. Results show that SAA growth dynamics are dominated by coagulation and condensation mechanisms for small and large aerosols, respectively. The two mechanisms are coupled mainly in SAA sizes smaller than 0.05 μm. A large amount of time was allotted for the SAA distribution to grow into an approximately log-normal form without the use of any activation methods. Cooling gas and corona discharge can both enhance SAA growth. Cooling gas is in charge of condensation, whereas corona discharge mainly acts on coagulation. They exhibited 14.3% and 12.3% increases in mean diameter and 12.3% and 69.1% decreases in number concentration. In contrast, adding vapor led to a 1.58% decrease in mean diameter and a 9.4% increase in number concentration. Findings suggest that combining cooling gas and corona discharge to simultaneously promote coagulation and condensation and reduce SAA emission from humid flue gas is possible.

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“…Furthermore, some studies focused on the synergetic removal of SO x and particulate matter (PM). [28][29][30] The removal efficiency of SO x and PM in flue gas was improved by adjusting electric field, humidity, and temperature. The authors were concerned about the dust removal efficiency of WESP systems in which the operating conditions were different from those in LLTSs, especially for humidity and temperature.…”

Section: Introductionmentioning

confidence: 99%

Effect of ash composition on adsorption and agglomeration characteristics in low‐low‐temperature electrostatic precipitator systems

et al. 2021

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The low‐low temperature electrostatic precipitator (LLT‐ESP) has been applied in many power plants to improve the emission performance. In this study, a number of fix‐bed experiments were conducted, which simulated the operation condition of LLT‐ESP. The effect of chemical composition on the adsorption characteristics of ash samples and the agglomeration after adsorption were studied. The results show that the agglomeration of ash particles occurs in three forms, including agglomeration among small particles, adhesion of loose pellets to large particles, and agglomeration among large particles. The capacity of ash particles to adsorb sulphuric acid is less affected by the increase of added amounts of NaCl or KCl. At the same time, the added amount of NaCl or KCl also has little effect on the agglomeration degree of ash particles. The addition of MgO, CaO, Fe2O3, Na2CO3, or K2CO3 from 0% to 13.3%, 22.4%, 23.9%, 18.4%, or 14.2%, promotes the adsorption of sulphuric acid by ash particles from 1.95 mg g−1 to 7.33, 7.71, 6.72, 5.1, or 5.44 mg g−1 (based on sulphur content), respectively, thereby promoting the agglomeration between ash particles. As the addition amount increases, the agglomeration phenomenon among particles becomes more conspicuous. The form of agglomeration changes from agglomeration among small particles to agglomeration among large particles. In addition, the addition of MgO or CaO has great influence on the adsorption and agglomeration.

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A combined wet electrostatic precipitator for efficiently eliminating fine particle penetration

Cited by 61 publications

References 30 publications

Current Emissions and Future Mitigation Pathways of Coal-Fired Power Plants in China from 2010 to 2030

Current Emissions and Future Mitigation Pathways of Coal-Fired Power Plants in China from 2010 to 2030

Fast Evolution of Sulfuric Acid Aerosol Activated by External Fields for Enhanced Emission Control

Effect of ash composition on adsorption and agglomeration characteristics in low‐low‐temperature electrostatic precipitator systems

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