Process and system for production of concentrated sulphuric acid from off-gas

The invention provides a process and system for production of concentrated sulphuric acid from sulphuric acid by stripping the sulphuric acid with dried air. The concentration of the sulphuric acid is 90 - 98 % by weight, and the concentration of the concentrated sulphuric acid is 95 - 98.8 % by weight. The air is dried in a dehumidifier. The sulphuric acid can be formed by cooling and condensing of a sulphur trioxide/water containing off-gas thus forming the sulphuric acid. The cooling and condensing can take place in an air cooler, and if an absorption dryer is used, it can be regenerated by warm air being cooling air transferred from the outlet of the air cooler. 本发明涉及用于从尾气生产浓硫酸的方法和系统。本发明提供用于通过用干燥空气汽提热硫酸从硫酸生产浓硫酸的方法和系统。硫酸的浓度为90?98重量％，浓硫酸的浓度为95?98.8重量％。空气在吸湿装置中进行干燥。硫酸可以通过冷却和冷凝包含三氧化硫/水的尾气由此形成硫酸而形成。冷却和浓缩可以在空气冷却器中进行，如果使用吸收干燥器，它可以通过为从空气冷却器的出口转移的冷却空气进行再生。