Engine exhaust gas additive storage system

The invention provides an engine exhaust gas additive storage system. It is proposed a system for storing a solution of ammonia precursor for use as an exhaust gas additive. The system comprises: a tank (100) for storing the solution in a liquid state and/or a frozen state; and a freeze protection device (30) comprising a cavity (31) for a fluid, said cavity being deformable under pressure and comprising an exit (33) being in fluid communication with a fluid space, said cavity being configured to discharge the fluid from the cavity into the fluid space such that an expansion of the solution (50, 61) upon freezing is compensated by volume reduction of the cavity under deformation of the cavity. 本发明提出了种存储系统，用于存储用作排放气体添加剂的氨前体的溶液，该系统包括：用于存储处于液态和/或冻结状态的溶液的箱(100)；以及，包括用于流体的空腔(31)的冻结保护设备(30)，所述空腔(31)能够在压强下变形并包括与流体空间流体联通的出路(33)，所述空腔被配置为用于将流体从空腔排到流体空间中，以使得溶液(50、61)在冻结时的膨胀被空腔(31)由于空腔(31)的变形而引起的容积减小所抵消。