结果表明，空塔速度对冷凝效率及成酸浓度影响最大，冷凝器出口温度次之。
The results showed that the condensation efficiency and the sulphuric acid concentration were affected by superficial velocity considerably, then the condensation temperature.
应积极推荐采用旁路三通调节阀，因为这样能保持冷凝器进出口设有温度计管，便于观察和保养工作。
Bypass should recommend the use of three-way valves, which have to maintain export condenser tube thermometer. facilitate the observation and maintenance work.
应用推荐