从传化器第三层来的烟气在冷中间交换器a和b中冷却，然后流过一吸塔。在此三层转化的so3被次吸收到循环的%硫酸中，然后烟气经过一个除雾器流出，在冷中间热交换器a和b及热中间热交换器被重新加热，然后返回转化器的第四层进行二次转化。烟气在进入二吸塔之前在冷热交换器和so3冷却器中被冷却。二吸塔中，第四层转化形成的so3被吸收到循环的%硫酸中。烟气经过一个碰撞型除雾器后流出塔，进入烟囱排放，基本上没有so2和酸雾。通过一组在两系统中允许自动控制酸浓和泵槽液位的串酸管线，它与用于干燥塔的浓酸系统连通。
一吸塔上塔流量控制，通过调节在共用一吸/二吸塔酸冷器酸旁路管线上的阀门。上塔的酸温控制，通过调节从共用酸冷器到一吸塔的流出管线上阀门。
二吸塔上塔流量控制，通过调节在共用酸冷器酸旁路管线上的阀门。上塔的酸温控制，通过调节在从一吸/二吸塔酸冷器到埂吸塔的流出管线上的阀门。
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