工艺参数对轻石脑油裂解结焦的影响  

Influence of process parameters on coke formation during cracking of light naphtha

作　　者：栾小建[1] 徐宏[1] 王志远[1] 周建新[1,2] 朱巍[1] 

机构地区：[1]华东理工大学机械与动力工程学院化学工程联合国家重点实验室,上海200237 [2]中国石化扬子石化有限公司,江苏南京210048

出　　处：《现代化工》2011年第3期58-62,共5页Modern Chemical Industry

基　　金：上海市重点学科建设项目(B503);扬子石化有限公司资助

摘　　要：为了研究工艺参数对结焦的影响,以轻石脑油为裂解原料,在设定工艺条件下进行了HP40合金试样氧化表面的结焦试验。利用扫描电子显微镜(SEM)、能量色散谱仪(EDS)对HP40合金试样表面的氧化层和焦层进行了表征。考察了裂解时间、裂解温度和稀释比对其结焦的影响。结果表明,HP40合金试样表面氧化层多孔,为尖晶石结构,尖晶石的粒径最大约为0.5μm。在裂解温度为850℃时,随着时间增加,结焦量、催化焦丝直径增加,焦丝直径生长速率约为0.027μm/min;在裂解时间为20 min时,随着温度增加,催化焦丝直径增加,焦丝直径生长速率约为0.0051μm/℃,当焦丝直径增加至0.8μm左右时,催化结焦过程结束,热裂解结焦开始。稀释比增大,结焦速率降低。To study the influence of process parameters on coke formation, a test for the coking is carried out on the oxidized surface of HP40 alloy specimen under setting conditions with naphtha as steam cracking material. The oxidized surface of HP40 alloy specimen and the cokes formed in the coking test are characterized by scanning electron microscopy （SEM） and X-ray energy dispersive spectroscopy （EDS）. The influence of cracking time, cracking temperature and diluted ratio on coke formation are investigated. The results show that the oxidized surface of HP40 alloy specimen is a porous layer and composed of spinel, and its particle sizes are less than 0. 5μm. At cracking temperature of 850℃ ,the mass of coke and the diameter of filamentous coke increase with the increase of coking test time, and the diameter increasing rate of filamentous coke is about 0. 027 tzm/min. At cracking time of 20 min, the diameter of filamentous coke increases with the increase of coking test temperature, and its increasing rate is about 0. 0051 pLm/~C. When the diameter of filamentous coke increases to about 0. 8 μm, thermal cracking coking is begin and catalytic cracking coking process is over. Coking rate decreases with diluted ratio increasing.

关 键 词：结焦 HP40合金 轻石脑油 工艺参数 影响 

分 类 号：TQ031.3[化学工程]