联合装置在检修期间进行的腐蚀调查表明：常压分馏系统的初馏塔(材质Q 2 35 - B)腐蚀较轻，挂片腐蚀率为0。
The corrosion survey for the complex unit during the turnaround finds out the minor corrosion in the primary distillation tower (metallurgy: Q235-B) with a coupon corrosion rate of 0.
同时指出，针对增设初馏塔以后的情况，应调整装置换热网络及调整分馏塔中、下段的开孔率。
Meanwhile, the author points out that, with the prefractionator, the heat exchanger network of the unit should be rearranged and some holes of the middle and lower trays of the prefract…
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