- Volume 6 Issue 1
Simultaneous removal efficiencies of hydrophilic and hydrophobic gaseous pollutants are experimentally determined, and the macroscopic removal mechanism of pollutants in a dry scrubber is analyzed using the extended model of three phase equilibrium distribution of pollutant at high temperatures that can describe the different morphological conditions of adsorbent and water at varying relative humidities. For the simplicity, the inside of spray dryer is divided into three regions of ; (1) absorption, (2) three-phase equilibrium, and (3) adsorption, and the removal efficiencies of each pollutants at three regions are observed at different experimental conditions to estimate the effects of important parameters of dry scrubber. The laboratory experiments simulate the three regions of spray dryer with the temperature control and thus evaporation rate of water from the slurry particle. $SO_2$ as a hydrophilic gaseous pollutant and vinyl chloride as a hydrophobic toxic gas are selected for the future field application to soid waste incineration, and the two types of slurry are made of the two sorbents ; 10 wt.% $Ca(OH)_2$, and 10 wt.% NaOH. Result of temperature effect shows the height of absorption plus three-phase region is decreased as the operation temperature is increased, which results in the lower removal efficiency of $SO_2$ but higher removal for vinyl chloride in the adsorption region of dry scrubber. The removal efficiency of $SO_2$ is higher by NaOH slurry than by $Ca(OH)_2$ slurry due to the hygroscopic nature of NaOH, while the removal of vinyl chloride is higher in $Ca(OH)_2$ case. From the analysis of redults using three-phase equilibrium distribution model, the effective two-phase partition coefficients can be obtained, and the possible extention in the application of the three-phase equilibrium model in a dry scrubber design has been demonstrated.
- ALChE v.6 Heat and Mass Transfer in Spray Drying Dlouhy,J.;Gauvin,W.H.
- Chem. Eng. Sci. v.29 Mathematical Model for Spray Drying Parti,M.;Palancz,B.
- JAPCA v.29 Modeling the Spray Absorption Process for SO₂Removal Getler,J.L.(et al).
- Water Chemistry Snoeyink,V.L.;Jenkins,D.
- Spray Drying Handbook Masters,K.
- KAIST 토목공학과 석사학위논문 토양내 유기독성물질의 평형분포에 미치는 토양 수분과 온도의 영향 김동하
- JAPCA v.39 Some Physico Chemical Aspects of Dry Sorbent Injection for HCI and HF from Wastes Incinerator Flue Gases Schmal,D.(et al).
- JAPCA v.39 Removal of SO₂and Nox from Stack Gas by Reaction with Calcium Hydroxide Solids Chu,P.;Rochelle,G.T.
- Proceedings:The Application of US Pollution Control Technology in Korea Control of Residuals and Emissions from Hazardus Waste Incineration Adu,M. A.
- Chem. Eng. Comm. v.77 Surface Area Formation in Dry FGD Sorbents Keener,T.C.;Jiang,X.
- Transport Processs and Unit Operations Geankoplis,C.J.