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Selection of Desulfurizer and Control of Reaction Products on Flue-Gas Desulfurization Using Chemical-Looping Technology
- Xuan, Yanni, Yu, Qingbo, Qin, Qin, Wang, Kun, Duan, Wenjun, Liu, Kaijie, Zhang, Peng
- Energy & fuels 2018 v.32 no.1 pp. 889-900
- Gibbs free energy, air, byproducts, carbon dioxide, computer software, economic valuation, energy efficiency, flue gas, flue gas desulfurization, fuels, hydrogen, manganese oxides, nitrogen oxides, oxygen, pollution, sulfur, sulfur dioxide, temperature
- Chemical-looping technology (CLT) can achieve energy efficiency and reduce the environmental pollution and is usually conducted on a fixed-bed reactor. In this paper, the thermodynamic simulations for flue-gas desulfurization (FGD) systems with CLT are carried out using HSC Chemistry software to choose a suitable desulfurizer, control the type and quantities of reaction products, and collect sulfur-containing byproducts with high economic value. The Ellingham diagrams are developed to relate the Gibbs free energy of the relevant reactions to the temperature. The fixing-sulfur potential; the reaction degree with CO₂, H₂O, and CO; and the acceleration effect of removing NOₓ of different metal oxides in 100 to 300 °C are estimated. Compared comprehensively, Mn-based oxides have distinct advantages for flue-gas desulfurization using CLT. Based on calculation results, both low reaction temperatures (T < 400 °C) and sufficient H₂ (mH₂/mMₙSO₄ > 4) can effectively prevent the loss of sulfur element. In the regeneration of Mn₃O₄, if pure O₂ is replaced by diluent air or a low level of oxygen, the formation of trace amounts of MnSO₄ can be inhibited. This paper provides ample theoretical basis for Mn-based oxides as active components of desulfurizer and collecting pure SO₂ from flue gas through chemical-looping technology.