石灰石-石膏法

石灰石-石膏法是應用最廣泛的脫硫方法，因為脫硫效率高且適應性強^[1]而可以應用於煙道氣脫硫、汽車尾氣脫硫及工廠廢氣脫硫等。美國、德國及日本有90%以上的火力發電廠使用該方法脫硫。石灰石-石膏法的原理是採用噴淋塔結構，含塵煙氣與霧化的脫硫漿液逆向接觸，通過漿液的洗滌作用，脫除煙氣中的顆粒物和有害物質^[2]。然而，脫硫漿液霧化等的脫硫過程中可能會產生新的亞微米級微粒，很容易就被煙氣夾帶出脫硫系統，令脫硫淨煙氣中的顆粒物濃度提升^[3]。

該方法利用了以下反應：

CaCO₃ + SO₂ =△= CaSO₃ + CO₂ 2CaSO₃ + O₂ == 2CaSO₄

參考資料

^ Nygaard, Helle G.; Kiil, Søren; Johnsson, Jan E.; Jensen, Jørgen N.; Hansen, Jørn; Fogh, Folmer; Dam-Johansen, Kim. Full-scale measurements of SO2 gas phase concentrations and slurry compositions in a wet flue gas desulphurisation spray absorber. Fuel. 2004-06, 83 (9): 1151–1164. doi:10.1016/j.fuel.2003.12.007.
^ LI B; WANG H L; XU Y Y; et al. Reduction of trace elements in flue gas by wet desulphurization facilities in coal-fired power plants. Journal of China Coal Society. 2015, 40 (10): 2479-83. doi:10.13225/j.cnki.jccs.2015.0146.
^ NIELSEN M T, LIVBJERG H, FOGH C L, 等.Formation and emission of fine particles from two coal-fired power plants. Combustion Science and Technology, 2002, 174(2): 79-113.

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[1] Nygaard, Helle G.; Kiil, Søren; Johnsson, Jan E.; Jensen, Jørgen N.; Hansen, Jørn; Fogh, Folmer; Dam-Johansen, Kim. Full-scale measurements of SO2 gas phase concentrations and slurry compositions in a wet flue gas desulphurisation spray absorber. Fuel. 2004-06, 83 (9): 1151–1164. doi:10.1016/j.fuel.2003.12.007.

[2] LI B; WANG H L; XU Y Y; et al. Reduction of trace elements in flue gas by wet desulphurization facilities in coal-fired power plants. Journal of China Coal Society. 2015, 40 (10): 2479-83. doi:10.13225/j.cnki.jccs.2015.0146.

[3] NIELSEN M T, LIVBJERG H, FOGH C L, 等.Formation and emission of fine particles from two coal-fired power plants. Combustion Science and Technology, 2002, 174(2): 79-113.

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