Investigation on the removal of SO 3 in ammonia-based WFGD system

Huang, Rongting; Yu, Ran; Hao, W.; Pan, Danping; Zhang, Yaping; Yang, Linjun

doi:10.1016/j.cej.2016.01.020

Cited by 57 publications

(21 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to avoid sulfuric acid aerosols condensing in the sampling probe, the flue gas was first heated to a temperature above the acid dew point (180 °C) and then cooled down to completely condense in the spiral condenser. In the spiral condenser, the temperature of circulating cooling water was set at 60 °C . This temperature would be higher than the water dew point and lower than the acid dew point.…”

Section: Experimental Sectionsmentioning

confidence: 99%

“…In order to mitigate the emission of SO 3 or sulfuric acid aerosols, many control methods have been proposed, such as injecting alkaline matter into flue gas, upgrading the electrostatic precipitator (ESP) to low‐temperature ESP, optimizing the parameters of the WFGD system and installing a wet electrostatic precipitator (WESP) system . These control methods have been proven effective and many of them have been implemented in power plants.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Hao

Pan

Hong³

et al. 2016

J. Chem. Technol. Biotechnol.

Self Cite

View full text Add to dashboard Cite

BACKGROUND: The reduction of sulfuric acid aerosol emissions in coal fired power plant is of great importance. Based on the classical theory of heterogeneous vapor condensation, a novel engineering process was proposed to increase the efficiency of removal of sulfuric acid aerosols by adding moist air in the condensational growth chamber (CGC), following the desulfurization scrubber. RESULTS:The theoretical analysis showed that this novel process was feasible. The experimental results indicated that the efficiency of removal of sulfuric acid aerosols was mainly influenced by the amount of moist air added and the humiture of desulfurized flue gas and moist air. Higher humiture of desulfurized flue gas could promote removal efficiency, whereas higher temperature of moist air was unfavorable. However, the influence of the relative humidity of moist air was not obvious. Moreover, increasing the mixture ratio was also beneficial for the improvement of removal performance in the range below 10:20. CONCLUSION: The process proposed was feasible for industrial application. The efficiency of removal of sulfuric acid aerosols was enhanced to 30-50% by this novel process.

show abstract

Section: Experimental Sectionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Hao

Pan

Hong³

et al. 2016

J. Chem. Technol. Biotechnol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The wet desulfurization tower is widely used to remove SO 2 in power plant. The removal efficiency of SO 2 can reach over 98%, and several CFPs, such as sulfuric acid aerosols, 18 sulfate aerosols, 15 and volatile organic compounds, 22 can be removed simultaneously; 6 however, the removal efficiency is generally less than 70%. Given that the removal mechanism of SO 2 in the wet desulfurization tower is gas−liquid mass transfer absorption, trapping of CFPs is based on Brownian diffusion, truncation, and collision.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Condensable Fine Particle Size Distribution in Simulated Flue Gas by External Regulation for Growth Enhancement

Zheng

Shen

et al. 2020

Environ. Sci. Technol.

View full text Add to dashboard Cite

Condensation fine particles (CFPs) from coal-fired flue gas harm humans and the environment after being emitted into the atmosphere. Given their small size (<0.1 μm), difficulty arises in efficiently removing CFPs by wet electrostatic precipitators and mist eliminators. In this work, a laboratory apparatus was used to study the CFP growth under simulated power plant conditions. Four methods were independently investigated to increase the particle size: addition of ammonia, addition of fly ash, decreasing temperature, and applying an electrical discharge. Results demonstrated that the CFP size distribution possessed a unimodal structure with peak at 0.05 μm. At increased ammonia concentration from 10 to 30 ppm, the peak of growth factor shifted rightward and increased from 1.21 to 1.35 and the range of growth factor >1 was significantly broadened due to joint action of multiple mechanisms. Fly ash acted as the core, and CFPs adhered to the ash surface when forming ash−salt droplets. Cooling flue gas could also enhance the CFP growth due to vapor condensation. At decreased temperature from 45 to 30 °C, the median diameter of CFPs increased by 15%. Finally, the growth and agglomeration of CFPs can be further enhanced when an external electrical field was utilized. The size range of growth factor >1 can be broadened, and the peak growth factor significantly increased at 8 kV applied voltage. The research findings provide valuable guidance for effectively improving the CFP removal efficiency by external regulation for growth enhancement.

show abstract

“…Due to the cooling effect of the spraying liquid and the high humidity in WFGD, most of the SO 3 would be in the form of sulfuric acid aerosols. Huang et al and Pan et al , adopted an ammonia- and a limestone–gypsum-based WFGD, respectively, to investigate the formation and removal of sulfuric acid aerosols in a pilot-scale plant. It was found that the sulfuric acid aerosols, usually with a particle size less than 0.1 μm, were generated via homogenous nucleation.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Synergetic Removal of SO₃, SO₂, and Particulate Matter in a Gas–Liquid Flow Pattern-Controlling Column Coupled with Ultrasonic Wave

Chen

Jiang

Wang

et al. 2020

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The synergetic removal of multiple pollutants in flue gas was investigated in a gas−liquid flow pattern-controlling (FPC) column coupled with ultrasonic wave (UW). A pilot-scale experimental setup with a gas flow rate of up to ∼432 m 3 /h was developed for the removal of SO 2 , SO 3 , and fly ash. A comparative study was conducted between the FPC column and the traditional open spraying (OS) column to show the superiority of the FPC column. In general, the synergetic purification performance was significantly improved by using the FPC and UW. The SO 3 aerosol removal efficiency in the FPC column was about 9.9% higher than that in the OS column. At a liquid-to-gas ratio (L/G) of 10 L/Nm 3 , the efficiency of SO 2 , SO 3 , and fly ash particle removal increased by 8.7, 5.3, and 6.6% with the introduction of UW, respectively. This enhancement effect of the UW became greater with increasing the L/G due to the increased liquid holdup. Furthermore, the energy consumption analysis was applied based on an actual WFGD system of a 660 MW power plant to estimate the energy penalty of the FPC and FPC-UW columns.

show abstract

Investigation on the removal of SO 3 in ammonia-based WFGD system

Cited by 57 publications

References 15 publications

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

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

Evolution of Condensable Fine Particle Size Distribution in Simulated Flue Gas by External Regulation for Growth Enhancement

Experimental Investigation on the Synergetic Removal of SO₃, SO₂, and Particulate Matter in a Gas–Liquid Flow Pattern-Controlling Column Coupled with Ultrasonic Wave

Contact Info

Product

Resources

About

Investigation on the removal of SO 3 in ammonia-based WFGD system

Cited by 57 publications

References 15 publications

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

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

Evolution of Condensable Fine Particle Size Distribution in Simulated Flue Gas by External Regulation for Growth Enhancement

Experimental Investigation on the Synergetic Removal of SO3, SO2, and Particulate Matter in a Gas–Liquid Flow Pattern-Controlling Column Coupled with Ultrasonic Wave

Contact Info

Product

Resources

About

Experimental Investigation on the Synergetic Removal of SO₃, SO₂, and Particulate Matter in a Gas–Liquid Flow Pattern-Controlling Column Coupled with Ultrasonic Wave