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为了抑制乙烯裂解炉管内表面结焦,在实验室小试的基础上,对SiO2/S涂层进行了中试制备研究。并分析了不同气体流速对涂层形貌和结构的影响,优化了涂层中试制备工艺。采用扫描电子显微镜和Raman光谱对涂层形貌、成分和结构进行了表征。对优化后涂层的热冲击性能进行了考核。结果表明:随着气体流速的增加,炉管出口涂层粒子逐渐变小,结合也更加致密。同时,涂层厚度及Si-O-S结构逐渐增加。当气体流速为30~40 m/s时,炉管出口涂层厚度为8~10μm,粒子结合致密。涂层经过16次热冲击试验后仍未剥落,可以满足抑制炉管结焦使用要求。
In order to inhibit the coking on the inner surface of ethylene cracker tube, a pilot-scale preparation of SiO2 / S coating was carried out on the basis of a small laboratory test. The effects of different gas flow rates on the morphology and structure of the coating were analyzed, and the preparation process of the coating was optimized. The morphology, composition and structure of the coating were characterized by scanning electron microscopy and Raman spectroscopy. The thermal shock performance of the optimized coating was evaluated. The results show that with the increase of the gas flow velocity, the coating particles on the exit of the furnace tube become smaller and the bond more compact. At the same time, the coating thickness and Si-O-S structure gradually increased. When the gas flow rate is 30 ~ 40 m / s, the thickness of the coating at the outlet of the tube is 8 ~ 10μm, and the particles are densely packed. Coating after 16 thermal shock test has not flaked, to meet the requirements of curb furnace coke.