... primary dip ==> 原始倾斜 primary distillation of crude oil ==> 原油初馏 primary distillation tower ==> 初馏塔 ...
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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.
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.
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