经过原油换热器，热的原油被送至初馏塔第四层塔盘。
From the crude heater, the hot crude oil is delivered to the crude tower above the fourth tray.
对初馏塔的模拟除初顶油质量存在很小的误差外，流量和温度等关键指标与实际是一致的；
Simulation results of primary tower were in accord with plant data except slight deviation of gasoline quality.
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…
首先利用原油实沸点蒸馏数据将原油切割为一定数目的虚拟组分，并以此作为常减压装置初馏塔的输入。
First of all, crude oil was cutting into several pseudo components which act as input of primary tower according to its true boiling points data.
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.
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.
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