表面状况对HK40裂解炉管结焦性能的影响研究

INFLUENCE OF SURFACE STATUS ON THE ANTI-COKING PERFORMANCE OF HK40 CRACKING TUBE

对两个批次的HK40裂解炉管进行研究发现,二者在裂解实验中结焦量差别明显。通过EDS、SEM对两个批次的裂解炉管分析发现,二者基体元素组成相似,但裂解炉管内表面的表面形态和元素组成相差很大,氧化铬晶须的存在是使裂解炉管结焦量减少的主要原因。采用EDS对裂解炉管出口焦炭粉末分析表明,裂解过程中结焦量大的HK40裂解炉管结焦焦体中存在大量Fe、Ni等组分。

Two batches of HK40 tube were used in the paralysis experiment of NAP. It was found that their coking rate was obviously different. The tubes were then characterized by Energy Dispersive Spectrometer (EDS) and scanning electron microscope (SEM) . The characterizations showed that the two batches of HK40 tube had a similar matrix element,but the morphology and the elemental composition of the inner surfaces varied greatly. It was also found that the presence of chromium oxide whisker on the surface of tube was the main reason for the reduction of coking. The coke powders were collected at the outlet of cracking tube and analyzed through EDS. Large amounts of Fe and Ni components,which could easily lead to coking,were found in the coke powder collected from the outlet of the more-coking tube.