摘要
SO_(3)气体产生空间冷凝形成酸雾,必须超额过饱和。过饱和度等于平衡过饱和度加上超额过饱和度。平衡过饱和度服从开尔文方程,为液滴表面饱和蒸气压与热力学数据中的饱和蒸气压之比值,是维持液滴的最小过饱和度。液滴粒径不能趋于零,平衡过饱和度不可能无穷大。冷凝前,过饱和度分不出平衡和超额。冷凝时,超额过饱和度消失,初始粒径在10 nm以下,协同时间以纳秒计。冷凝后,小颗粒消亡、大颗粒长大,颗粒数量迅速减少。湿法制酸成酸进程中的过冷温差不断升高,空间冷凝难度大增。吸收及表面冷凝过程,都可避免空间冷凝。取样改变了气体状态,空间冷凝随之发生。
When droplets are condensed in space forming sulphuric acid mist,the SO3 gas must be supersaturated.Supersaturation is equilibrium supersaturation plus excess supersaturation.The equilibrium supersaturation obeys Kelvin equation,which is the ratio of the saturated vapor pressure on the droplet surface to the saturated vapor pressure in the thermodynamic data,and is the minimum supersaturation to maintain the droplet.The droplet size can not approach zero and the equilibrium supersaturation can not be infinite.Before condensation,supersaturation can not be divided into equilibrium and excess.During condensation,the excess supersaturation disappears,the initial particle size is less than 10 nm,and the synergistic time is calculated in nanoseconds.After condensation,small particles die out,large particles grow,and the number of particles decreases rapidly.The supercooling temperature difference in the process of wet acid production is increasing,and it is more difficult to condense in space.The space condensation can be avoided during absorption and surface condensation.Sampling changes the gas state and space condensation occurs.
作者
丁华
DING Hua(Xinghua Hongwei Technology Co.,Ltd.,Taizhou,Jiangsu,225715,China)
出处
《硫酸工业》
CAS
2021年第6期1-5,21,共6页
Sulphuric Acid Industry
关键词
酸雾
空间冷凝
过饱和度
湿法制酸
半干法制酸
酸热回收
sulphuric acid mist
space condensation
supersaturation
wet acid production
semi dry acid production
acid heat recovery
