Kinetics of oxidation of total sulfite in the ammonia-based wet flue gas desulfurization process

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 164; no. 1; pp. 132 - 138
• Main Authors: Jia, Yong, Zhong, Qin, Fan, Xueyou, Wang, Xinrong
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier B.V 15.10.2010; Elsevier
• Subjects: Air flow; Applied sciences; Atmospheric pollution; Bubbling reactor; Chemical engineering; Desulfurizing; Exact sciences and technology; Flues; General processes of purification and dust removal; Heat and mass transfer. Packings, plates; Kinetics; Mass transfer; Mathematical model; Mathematical models; Oxidation; Pollution; Prevention and purification methods; Reaction kinetics; Reactors; Sulfites; Total sulfite; Bubbling reactor; Total sulfite; Oxidation; Kinetics; Mathematical model; Mass transfer; Desulfurization; Modeling; Operating conditions; Bubbling; Design; Kinetic model; Air flow; pH; Thermodynamic properties; Reactor; Activation energy; Flue gas purification
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2010.08.041

Using bubbling apparatus, the kinetics of oxidation of total sulfite in ammonia-based wet flue gas desulfurization (FGD) process was investigated by varying concentrations of SO 3 2− and SO 4 2−, pH, temperatures and air flow. The concentration range of sulfite is 0.0044–0.026 gmol L −1 and that of sulfate is 0.5–2 gmol L −1. Experiments were conducted at pH level of 4.5–6.5 and air flow ranging from 50 to 200 L h −1. In the temperature range of 303.15–333.15 K, the reaction was found to be −0.5 order with respect to sulfite. The experimental findings also showed that the bisulfite could be oxidized easier than sulfite. Thus, keeping the pH level of the solution low is conducive to the oxidation of total sulfite. The apparent activation energy for the overall oxidation was calculated to be 28.0 kJ mol −1. A kinetic model has been derived according to the experimental results. The developed kinetic model, including the operating parameters SO 3 2− concentration, SO 4 2− concentration, pH, temperature and air flow, can be applied to simulate the oxidation of total sulfite. This model would be useful for the design of the ammonia-based wet FGD system.