CAJ | 학술논문

基于湿法烟气脱硫试验装置,对含不同质量分数飞灰的4种石膏浆液的浸出特性、吸收速率、pH值、传质阻力和SO32-氧化等关键参数进行了研究。试验表明：浆液pH值变化分为pH值快速下降和平稳下降2个阶段;Mn2＋浸出量为Fe3＋的9倍,Mn2＋与HSO3-形成络合物诱发催化反应加速SO2吸收;初期pH值较高,飞灰对SO2吸收速率的影响小于1.5%,pH=5时,飞灰浸出液中可溶性Mn2＋增多,Mn2＋催化效果更加明显,SO2吸收速率最多增加6%;浆液吸收过程由液相阻力控制,气相阻力在总阻力的比重小于38%;Mn2＋的质量浓度越大,对SO32-的催化氧化作用越强。
기우습법연기탈류시험장치,대함불동질량분수비회적4충석고장액적침출특성、흡수속솔、pH치、전질조력화SO32-양화등관건삼수진행료연구。시험표명：장액pH치변화분위pH치쾌속하강화평은하강2개계단;Mn2＋침출량위Fe3＋적9배,Mn2＋여HSO3-형성락합물유발최화반응가속SO2흡수;초기pH치교고,비회대SO2흡수속솔적영향소우1.5%,pH=5시,비회침출액중가용성Mn2＋증다,Mn2＋최화효과경가명현,SO2흡수속솔최다증가6%;장액흡수과정유액상조력공제,기상조력재총조력적비중소우38%;Mn2＋적질량농도월대,대SO32-적최화양화작용월강。
In the experimental setup of wet flue gas desulfurization, key parameters such as leaching behavior, SO2 absorption rate, pH value of slurry, mass transfer resistance and oxidation rate of SO3^2- were studied for 4 kinds of gypsum slurry containing fly ash of different concentrations. Results show that the pH-t curve of slurry could be divided into sharply and steadily dropping stages. The leaching content of Mn^2＋ is about 9 times of Fe^3＋ , and the Mn^2＋ can form intermediate complex with HSO3^-, thus inducing catalytic reaction and promoting SO2 absorption. At the initial reaction stage, the SO2 absorption rate improved by fly ash is less than 1.5%. With the reduction of pH value, the leaching content of Mn2＋ grows, resulting in stronger catalytic effect; the SO2 absorption rate can be increased by 6.0% at most, in the case of pH=5. All the absorption reactions are controlled by liquid phase resistance, and the ratio of gas phase resistance to overall resistance is less than 38%. The higher the mass concentration of Mn^2＋ , the stronger the catalytic effect on oxidation of SO3^2-.