Effect of Initial Droplet Size Distribution on Sulfur Removal Efficiency in FGD/SDA

Eui-Kyung Oh; Gi-Hune Jung; Sun-Geon Kim; Hyung-Keun Lee; In-Won Kim

Korean Journal of Chemical Engineering, Vol.16, No.3, 292-297, May, 1999

DOI10.1007/BF02707115 Export Citation

Effect of Initial Droplet Size Distribution on Sulfur Removal Efficiency in FGD/SDA

Eui-Kyung Oh¹, Gi-Hune Jung¹, Sun-Geon Kim^{1, †}, Hyung-Keun Lee^{1, 2}, and In-Won Kim^{1, 3}

¹Department of Chemical Engineering, Chung Ang University, Seoul, Korea
²Energy and Environmental Research Department, Korea Institute of Energy Research, Taejon, Korea
³Department of Chemical Engineering, Kon Kuk University, Seoul, Korea

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Dry scrubbing with lime slurry in a spray dryer [spray dryer absorber (SDA)] has been an important technology for flue gas desulfurization (FGD). Mathematical models based on the heat and mass balances are used to predict SO₂ removal in the SDA as a function of initial size distribution of slurry droplets. Since the existence of moisture in the droplets appreciably enhances the SO₂ removal, its removal efficiency depends on the rate of drying as well as that of SO₂ removal itself both depending on droplet diameter. With the increase in the geometric standard deviation (GSD) of the initial droplet size distribution, the efficiency of SO₂ removal first increases and then decreases, showing a maximum at a certain value of GSD. This trend is altered by the sorbent content of the droplets, expressed as stoichiometric ratio (SR). The decrease in SR makes the maximum move to higher GSD and reduces the variation ill the efficiency with respect to GSD. For SR<0.73, a minimum efficiency also appears, ahead of the maximum. The results are well explained by the specific rates of both drying and SO₂ removal of the droplets.

Keywords:Flue Gas Desulfurization Spray Dryer Absorber;Modeling;Droplet Size Distribution;Drying;SO₂ Removal

[References]

Jang SH, Oh EK, Lee HK, Kim SG, Clean Technol., 2(1), 80 (1996)
Jozewicz W, Rochelle GT, "Modeling of SO₂ Removed by Spray Dryers," Proc. First Annual Pittsburgh Coal Conf., Sept. 17-21, 663 (1984)
Klingspor J, Karlsson HT, Bjerle I, Chem. Eng. Commun., 22, 81 (1983)
Kolluri R, Hatcher WJ, Jefcoat LA, Drying Technol., 9, 367 (1991)
Partridge GP, "A Mechanistic Spray Dryer Mathermatical Model Based on Film Theory to Predict Sulfur-Dioxide Absorption and Reaction by a Calcium Hydroxide Slurry in the Constant Rate Period," Ph.D. Dissertation, Tennessee Univ., Knoxville, U.S.A. (1987)
Shih HS, "Simulation of Sulfur-Dioxide Removal via Hydrated Lime Slurries in a Spray Dryer Absorber Flue-Gas Desulfurization System," Ph.D. Dissertation, Alabama Univ., Tuscaloosa, U.S.A. (1989)
Yuan CS, "Simultaneous Collection of SO₂ and NO_x via Spray Drying: Using Sodium Based and Calcium Based Sorbents with Select Additives," Ph.D. Dissertation, Univ. of Illinois at Urbana-Champaign, U.S.A. (1990)

[Referenced By]

[Related Articles]

[1] Jang SH, Oh EK, Lee HK, Kim SG, Clean Technol., 2(1), 80 (1996)

[2] Jozewicz W, Rochelle GT, "Modeling of SO₂ Removed by Spray Dryers," Proc. First Annual Pittsburgh Coal Conf., Sept. 17-21, 663 (1984)

[3] Klingspor J, Karlsson HT, Bjerle I, Chem. Eng. Commun., 22, 81 (1983)

[4] Kolluri R, Hatcher WJ, Jefcoat LA, Drying Technol., 9, 367 (1991)

[5] Partridge GP, "A Mechanistic Spray Dryer Mathermatical Model Based on Film Theory to Predict Sulfur-Dioxide Absorption and Reaction by a Calcium Hydroxide Slurry in the Constant Rate Period," Ph.D. Dissertation, Tennessee Univ., Knoxville, U.S.A. (1987)

[6] Shih HS, "Simulation of Sulfur-Dioxide Removal via Hydrated Lime Slurries in a Spray Dryer Absorber Flue-Gas Desulfurization System," Ph.D. Dissertation, Alabama Univ., Tuscaloosa, U.S.A. (1989)

[7] Yuan CS, "Simultaneous Collection of SO₂ and NO_x via Spray Drying: Using Sodium Based and Calcium Based Sorbents with Select Additives," Ph.D. Dissertation, Univ. of Illinois at Urbana-Champaign, U.S.A. (1990)