石灰石-石膏法

石灰石-石膏法是应用最广泛的脱硫方法，因为脱硫效率高且适应性强^[1]而可以应用于烟道气脱硫、汽车尾气脱硫及工厂废气脱硫等。美国、德国及日本有90%以上的火力发电厂使用该方法脱硫。石灰石-石膏法的原理是采用喷淋塔结构，含尘烟气与雾化的脱硫浆液逆向接触，通过浆液的洗涤作用，脱除烟气中的颗粒物和有害物质^[2]。然而，脱硫浆液雾化等的脱硫过程中可能会产生新的亚微米级微粒，很容易就被烟气夹带出脱硫系统，令脱硫净烟气中的颗粒物浓度提升^[3]。

该方法利用了以下反应：

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

参考资料

^ 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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