ABSTRACT The frequent changes in the composition of acid gas feed to the Claus process cause flame instability and lead to the incomplete destruction of aromatic contaminants in feed that are benzene, toluene, ethylbenzene, and xylenes (BTEX). These aromatics cause frequent catalyst deactivation. The current literature lacks a reliable global kinetic model that can ease the computational burden of optimizing the process parameters to enhance flame stability and support BTEX destruction. In this paper, a kinetic model for BTEX oxidation is developed for the first time using a detailed reaction mechanism and is validated using plant data. The model is used to evaluate the effects of inlet air preheating, methane co-firing, and oxygen enrichment on BTEX destruction and furnace temperature. The simulation results ascertain that a favorable increase in the furnace temperature can be achieved with appropriate feed parameters such as feed temperature and O2 concentration to decrease BTEX emission from the furnace below 6 ppm. The model is used to conduct an optimization study that successfully demonstrates its capability to predict optimized inlet parameters for effective BTEX destruction, a high sulfur recovery efficiency, a low emission of CO and SO2, and a reduced fuel gas consumption in the Claus process plants.

中文翻译：

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硫磺回收装置炉内芳烃氧化：模型开发和优化

摘要 进入 Claus 工艺的酸性气体进料成分的频繁变化会导致火焰不稳定，并导致进料中的苯、甲苯、乙苯和二甲苯 (BTEX) 芳烃污染物的不完全破坏。这些芳烃会导致频繁的催化剂失活。目前的文献缺乏可靠的全局动力学模型，可以减轻优化工艺参数以增强火焰稳定性和支持 BTEX 破坏的计算负担。在本文中，首次使用详细的反应机理开发了 BTEX 氧化的动力学模型，并使用植物数据进行了验证。该模型用于评估进气预热、甲烷混烧和富氧对 BTEX 破坏和炉温的影响。模拟结果确定，通过适当的进料参数（例如进料温度和 O2 浓度）可以实现炉温的有利升高，从而将炉子的 BTEX 排放量降低到 6 ppm 以下。该模型用于进行优化研究，成功展示了其预测优化入口参数的能力，以实现有效的 BTEX 销毁、高硫回收效率、低 CO 和 SO2 排放以及减少克劳斯加工厂的燃气消耗。