BACKGROUND: Emissions of sulfuric acid droplets have caused many problems. Improving the removal efficiency of sulfuric acid droplets is of great importance. A novel process based on heterogeneous vapor condensation was proposed in this paper to improve the removal efficiency of sulfuric acid droplets in a limestone-gypsum desulfurization process.
RESULTS:The results indicated that the sulfuric acid droplets were relatively easily activated in a supersaturated vapor environment and condensed into larger droplets. The removal efficiency of sulfuric acid droplets in a wet flue gas desulfurization (WFGD) system could be significantly improved. The improvements were mainly related to the inlet flue gas moisture content and temperature. A relatively higher moisture content and lower temperature of inlet flue gas improved the removal performance. Moreover, the liquid-to-gas ratio and the SO 3 concentration also contributed to the improvement in removal efficiency. However, a higher temperature of the desulfurization slurry was unfavorable. CONCLUSION: The novel process based on heterogeneous vapor condensation is suitable for industrial application. The removal efficiency of sulfuric acid droplets can be improved from 30 ∼ 40% to greater than 60%.
The
fine particles in desulfurized flue gas comprise coal-fired
fine particles from combustion and generated fine particles from desulfurization.
The abatement of fine particle emission by heterogeneous vapor condensation
during wet flue gas desulfurization (WFGD) is experimentally investigated
in this paper. A supersaturation atmosphere, which is necessary for
heterogeneous vapor condensation, is established by increasing the
humidity and reducing the temperature of the flue gas before WFGD.
The improvement of the removal of coal-fired fine particles and the
inhibition of generated fine particles formation in desulfurization
process by heterogeneous vapor condensation were studied, and the
influences of inlet flue gas parameters on the emission of total fine
particles, including coal-fired fine particles and generated fine
particles during desulfurization, are examined. The results indicate
that the total emission of fine particles in desulfurized flue gas
can be significantly decreased via heterogeneous vapor condensation.
This decrease in the emission of coal-fired fine particles is mainly
related to the removal of fine particles via heterogeneous vapor condensation,
and the generation of fine particles from desulfurization is abated
because of both the decrease in the inlet flue gas temperature and
heterogeneous vapor condensation. Higher inlet flue gas humidity can
adequately reduce the emission of generated fine particles from desulfurization.
The reduction in the flue gas temperature before WFGD is the main
factor that inhibits the formation of fine particles and removes coal-fired
fine particles during desulfurization.
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.
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