Staged condensation of coal tar was studied with a three‐staged condensation system (first stage S1, 100–300 °C; second stage S2, 30–70 °C; third stage S3, 0 °C) to perform on‐line preliminary removal of dust and fundamental fractionation of tar components. The dust and heavy components are predominantly distributed in S1. The polycyclic aromatic hydrocarbons are abundant in S1. Aliphatics and monocyclic phenols are abundant in S2, and the tar in S3 is rich in aliphatics and monocyclic aromatic hydrocarbons. With increasing S2 temperature from 30 to 70 °C, the total organics in the water phase in S2 and S3 are least at an S2 temperature of 50 °C, which is advantageous for post‐treatment of wastewater.

中文翻译：

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螺杆热解器中煤热解过程中煤焦油的阶段性冷凝

使用三阶段冷凝系统（第一阶段S1，100-300°C；第二阶段S2，30-70°C；第三阶段S3，0°C）研究煤焦油的阶段性冷凝，以进行在线初步去除灰尘和焦油成分的基本分级。灰尘和重组分主要分布在S1中。S1中富含多环芳烃。S2中富含脂肪族和单环酚，S3中的焦油富含脂肪族和单环芳香烃。随着S2温度从30°C升高到70°C，S2和S3中水相中的总有机物至少在50°C的S2温度下，这对废水的后处理非常有利。