摘要
引言目前,石灰石-石膏湿法烟气脱硫工艺是在燃煤电厂应用最广的烟气脱硫技术,脱硫的副产品是脱硫石膏（CaSO4.2H2O）。但在实际运行过程中由于氧化率未达到要求值,从而使得产生的石膏晶体不足,形成了亚硫酸钙和硫酸钙的混合晶体[1];另外,燃煤锅炉产生的烟气虽经除尘,但进入脱硫装置时仍含有大量粉尘颗粒[2-3]。因此,在电厂实际的脱硫过程中,
Gas-liquid mass transfer was studied during forced sulfite oxidation in the presence of active carbon particles in a stirred tank.The influence of temperatures from 30℃ to 50℃,solid loading of fine particles from 0 to 1.0 kg·m-3,stirring speeds from 50 to 400 r·min-1,and particle sizes on average O2 gas absorption rate were studied.Experimental results show that active carbon particles could improve gas-liquid mass transfer remarkably.At 30℃,with the increase of solid loading of micro-particles,the oxygen absorption enhancement factor increases to a maximum value at the solid loading of 0.6 kg·m-3,and then decreases due to the increase of gas-liquid mass transfer resistance.For active carbon particles,the mass enhancement factor is much higher with ultrasonic processing for particle size of 1 μm.The oxygen absorption rate and absorption enhancement factor increase with the increase of stirring speed due to the acceleration of surface renewal frequency.The enhancement factor decreases as temperature increases while absorption rate increases.The result indicates that the effect of temperature on the mass transfer enhancement is stronger than the effect of fine particles.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2013年第4期1306-1311,共6页
CIESC Journal
基金
国家自然科学基金项目(50906044)~~
关键词
活性炭颗粒
气液传质
强制氧化
氧气吸收
active carbon particles
gas-liquid mass transfer
forced oxidation
oxygen absorption
