以Fe(II)EDTA探討煙道氣中除硫脫硝之吸收反應動力

• Main Author: 朱柏昱
• Other Authors: 宋信
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/50841891385626511637

碩士 === 國立成功大學 === 環境工程與科學系 === 85 === 　　The wet scrubbing combined SOx/NOx removal system is already one of promising air pollution control devices. We try to investigate the reaction kinetics of individual and simultaneous absorptions of SO2 and NO by aqueous solutions of Fe(Ⅱ)EDTA in this study. 　　The absorptions of diluted SO2 and NO as encountered in flue gases in aqueous solutions of Fe(Ⅱ)EDTA were carried out using a semi-batch stirred tank reactor with a plane gas-liquid interface at 50℃. The concentrations of SO2, No, and O2 in the feed stream varied from 500 to 2000 ppm, 300 to 800 ppm and 0 to 20%, respectively. The pH of Fe(Ⅱ)EDTA adjusts between 3~11. 　　The experiments were divided into two parts and ten runs total. The first seven were tested to evaluate the effect of operating parameters on the absorption rate, the reaction kinetics of the reactants in both gas and liquid phases, and the effect of competitions between various reactants on the mass transfer rate, in a simple DeSOx, simple DexNOx, and combined SOx/NOx removal system, respectively. A series of liquid phase analysis including SO42-, SO3-, NO3-, NO3-NO2-, and the complex Fe(Ⅱ)EDTA(NO) was done in part two. 　　The experiment results indicated that the absorption rate of NO was propotional to the partial pressure of NO and the concentration of Fe (ii)EDTA solution .We found the average absorption reaction rate constant under the fast-reaction regime. The addition of NaOH doesn''t increase the absorption ability of Fe(II)EDTA.SO2 will increase the absorption reaction rate of NO. But NO just rasie the absorption reaction tate rof SO2 slightly. Experimentally, the mass transfer of SO2 can''t reach the completely gas-film controlled status. O2 will decrease the absorption rate of NO. The major components are Fe(Ⅱ)EDTA(NO) and NO3- after NO partition into liquid.