从蒸馏试验所得初馏点与终馏点之间的温度差值。
The difference between the temperature at the initial boiling point and at the end point, as obtained by the distillation test.
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.
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