Formation of coke poses a considerable challenge in steam cracking reactors utilized for olefin production, exerting detrimental effects on the reactor performance and productivity. To tackle this challenge, a more profound understanding of fouling phenomena and their intricate connections with feedstock composition and process conditions is imperative. While conventional wisdom suggests that all aromatics contribute to increased coke formation, our research challenges this assumption. To evaluate this assumption, an investigation was conducted to measure the coking tendency of single-ring aromatics, double-ring aromatics, and naphtheno-diaromatic compounds by introducing them to a naphtha sample. On one hand, the incorporation of single-ring aromatics, up to 9 wt %, resulted in a 12% reduction in the overall coke formation rate across the radiant and TLE sections. Conversely, the introduction of 2 wt % double-ring aromatics exhibited a marginal 4% increase in coking rates. However, the introduction of a naphtheno-diaromatic compound led to a 35% increase in coke formation rates in the radiant and TLE sections. On the other hand, temperature emerged as a more significant factor influencing coke formation within steam cracking reactions. Elevating the coil outlet temperature (COT) from 950 to 970 °C resulted in a minimum 40% rise in the asymptotic coking rates. This study underscores the importance of comprehending coke formation mechanisms in steam cracking reactors and developing effective methods to mitigate fouling.

中文翻译：

---

蒸汽裂解反应器中的焦炭形成：解读芳香族化合物和温度对结垢动力学的影响


焦炭的形成对用于烯烃生产的蒸汽裂化反应器提出了相当大的挑战，对反应器性能和生产率产生有害影响。为了应对这一挑战，必须更深入地了解结垢现象及其与原料成分和工艺条件的复杂关系。虽然传统观点认为所有芳烃都会导致焦炭形成增加，但我们的研究挑战了这一假设。为了评估这一假设，通过将单环芳烃、双环芳烃和环烷双芳烃化合物引入石脑油样品中，测量了它们的结焦倾向。一方面，单环芳烃的加入量高达 9 wt%，导致辐射和 TLE 部分的总体焦炭形成率降低了 12%。相反，引入 2 wt% 双环芳烃后，焦化率略有增加 4%。然而，环烷双芳族化合物的引入导致辐射和 TLE 部分的焦炭形成率增加了 35%。另一方面，温度成为影响蒸汽裂化反应中焦炭形成的更重要因素。将盘管出口温度 (COT) 从 950 °C 提高到 970 °C 导致渐近焦化率至少上升 40%。这项研究强调了了解蒸汽裂化反应器中焦炭形成机制和开发有效减少结垢方法的重要性。