Removal of sulfuric acid aerosols in desulfurized flue gas by adding moist air

Hao, W.; Pan, Danping; Hong, Guangxin; Jiang, Yezheng; Yang, Linjun; Yang, Bing; Peng, Ziming

doi:10.1002/jctb.5078

Cited by 14 publications

(6 citation statements)

References 16 publications

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“…This finding indicates that when L/G ratio increases, the mean diameter of aerosol particles enlarges. This conclusion is consistent with the simulation and experiment results of previous studies. − …”

Section: Resultssupporting

confidence: 93%

Experimental Study on Removal Characteristics of SO₃ by Wet Flue Gas Desulfurization Absorber

Zheng

Hong

et al. 2018

Energy Fuels

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This paper reports a study on the simultaneous removal characteristics of SO 3 in a wet flue gas desulfurization (WFGD) system. The impacts of the operating parameters, including liquid-to-gas (L/G) ratio, inlet SO 3 concentration, flue gas temperature, superficial velocity, and slurry temperature, on the SO 3 removal efficiency and SO 3 aerosol characteristic were studied. Results showed that the overall SO 3 removal efficiency varied from 20% to 55% under the experimental conditions. For the SO 3 aerosol, particles measuring <0.1 μm and >0.5 μm had a higher removal efficiency, whereas particles measuring 0.1−0.5 μm were relatively difficult to remove in the WFGD system. Increases in L/G ratio and SO 3 concentration exerted positive effects on the SO 3 aerosol capture, whereas superficial velocity, flue gas temperature, and slurry temperature had negative effects. After installing a sieve plate, the SO 3 removal efficiency increased from 49.88% and 53.46% to 51.77% and 58.05%, respectively, under two typical conditions. A multilayer perceptron artificial neural network model was applied to evaluate the relative importance of each parameter in SO 3 removal performance. Results showed that inlet flue gas temperature, inlet SO 3 concentration, and slurry temperature had a relatively strong impact on SO 3 removal performance.

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Section: Resultssupporting

confidence: 93%

Experimental Study on Removal Characteristics of SO₃ by Wet Flue Gas Desulfurization Absorber

Zheng

Hong

et al. 2018

Energy Fuels

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“…Studies have indicated that the SO 3 synergistic removal efficiency of WFGD is mainly affected by the inlet SO 3 concentration, slurry temperature, the inlet flue gas temperature, liquid-to-gas ratio, and spray coverage (Wu et al, 2017b;Zheng et al, 2018). Wu et al (2017a) reported that the removal efficiency of SO 3 can be improved from 30-40% to greater than 60% by using a novel process based on heterogeneous vapor condensation.…”

Section: Analysis Of So3 Control Routesmentioning

confidence: 99%

An Investigation of SO3 Control Routes in Ultra-low Emission Coal-fired Power Plants

Yang

Zheng

Liu

et al. 2019

Aerosol Air Qual. Res.

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With the implementation of ultra-low emission systems in coal-fired power plants in China, the emission of sulfur trioxide (SO 3 ) has become an important issue in pollution control. However, systematic research and evaluation of SO 3 control routes based on the existing ultra-low emission systems are still lacking. We assigned 148 coal-fired power plants to four categories based on their ultra-low emission control routes and selected a representative power plant from each category for comprehensive field testing. The results indicated great variability in the synergistic SO 3 removal capability of different air pollution control devices and routes, resulting in removal efficiencies that ranged from 27% to 94%. Control Route 1, which lacked both a low-low temperature electrostatic precipitator (LLTESP) and a wet electrostatic precipitator (WESP), exhibited the lowest removal efficiency. The two routes equipped with either an LLTESP or a WESP (Control Routes 2 and 3) reduced the SO 3 concentration in the flue gas produced by medium-sulfur-coal combustion to below 10 mg m -3 , whereas Control Route 4, which utilized both an LLTESP and a WESP, reduced the SO 3 concentration to below 5 mg m -3 . Furthermore, sampling the emissions of the 148 power plants revealed that only 14% of the power plants complied with the 5 mg m -3 standard for SO 3 , although 44% and 64% of them complied with the 10 mg m -3 and the 20 mg m -3 standard, respectively. Our study evaluated the control routes within the context of the whole process, which can guide subsequent research and engineering practices.

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“…These can, therefore, enter the lungs and endanger human health [6][7][8][9]. Traditional dust removers, such as cyclone dust collectors and electrostatic precipitators (ESPs), although with high efficiency in decreasing the mass concentration of particles, exhibit low efficiency in removing PM 1 (85% or less) [10][11][12]. Wet electrostatic dust removal devices cover a large area, and they increase equipment operating cost.…”

Section: Introductionmentioning

confidence: 99%

The Influences of Acoustic and Pulsed Corona Discharge Coupling Field on Agglomeration of Monodisperse Fine Particles

He¹,

Luo²,

Wang³

2020

Applied Sciences

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In view of the low efficiency of traditional electrostatic precipitators in removing fine particles, acoustic and pulsed corona discharge coupling fields were proposed to increase particle size. In this paper, monodisperse particles with three different sizes (0.5 μm, 2 μm, and 4 μm) were generated to investigate the agglomeration effect under different parameters in external fields. A larger reduction ratio of particle number concentration resulted in a higher agglomeration efficiency. Results indicated that, in the range from 800 to 2400 Hz, the acoustic agglomeration effect on 4-μm particles was better than that on 0.5-μm and 2-μm particles. In the pulsed corona discharge field, agglomeration efficiencies of the three particle sizes were lower than those in the acoustic field. However, application of the coupling field highly improved agglomeration efficiency compared with the single field. When a pulse input voltage of 50 kV with acoustic sound pressure level (SPL) of 143 dB and frequency of 1600 Hz was selected, the corresponding number reduction ratio of 0.5-μm, 2-μm, and 4-μm particles increased to 0.464, 0.526, and 0.918 from 0.254, 0.438, and 0.814 in the acoustic wave field and 0.226, 0.385, and 0.794 in the pulsed corona discharge field.

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Removal of sulfuric acid aerosols in desulfurized flue gas by adding moist air

Cited by 14 publications

References 16 publications

Experimental Study on Removal Characteristics of SO₃ by Wet Flue Gas Desulfurization Absorber

Experimental Study on Removal Characteristics of SO₃ by Wet Flue Gas Desulfurization Absorber

An Investigation of SO3 Control Routes in Ultra-low Emission Coal-fired Power Plants

The Influences of Acoustic and Pulsed Corona Discharge Coupling Field on Agglomeration of Monodisperse Fine Particles

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Removal of sulfuric acid aerosols in desulfurized flue gas by adding moist air

Cited by 14 publications

References 16 publications

Experimental Study on Removal Characteristics of SO3 by Wet Flue Gas Desulfurization Absorber

Experimental Study on Removal Characteristics of SO3 by Wet Flue Gas Desulfurization Absorber

An Investigation of SO3 Control Routes in Ultra-low Emission Coal-fired Power Plants

The Influences of Acoustic and Pulsed Corona Discharge Coupling Field on Agglomeration of Monodisperse Fine Particles

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Experimental Study on Removal Characteristics of SO₃ by Wet Flue Gas Desulfurization Absorber

Experimental Study on Removal Characteristics of SO₃ by Wet Flue Gas Desulfurization Absorber