摘要
以某乙烯装置USC-28型加氢尾油裂解炉为对象,根据反应动力学、物料衡算、热量守恒和动量守恒等对裂解炉的蒸汽-空气烧焦过程进行了模拟,得到了温度、压力、物料浓度和焦炭厚度随时间和空间变化的动态烧焦模型;采用隐式差分Wendroff格式进行数值计算,并通过工业中试装置对模型进行了验证。验证结果表明,裂解炉出口处CO_2含量的模拟值与实际值的变化趋势基本相同,证明了模型的可靠性。通过对模型的分析,得到烧焦过程的影响因素为空气流量、裂解炉出口处管壁温度和烧焦时间,并提出了改进烧焦工艺的方法。该模型为实际烧焦过程的操作提供了参考,并为后续先进烧焦技术的开发提供了基础。
The steam-air decoking process in USC-28 cracking furnace coil was simulated based on reaction kinetics, material balance, heat balance and momentum conservation, and a dynamic decoking model for the variation of temperature, pressure, material concentrations and coke layer thickness in the decoking process with time and space was established. Calculation was carried out by implicit difference Wendroff scheme and the results were proved to be reliable through pilot plant test. The trends of the simulated values and actual values for CO2 content at the outlet of the cracking furnace were the same almost. The major factors influencing the decoking process included air flowrate, tube wall temperature at the outlet of the cracking furnace and decoking time. A method for improving the decoking process was proposed.
出处
《石油化工》
CAS
CSCD
北大核心
2014年第1期74-78,共5页
Petrochemical Technology
关键词
裂解炉
烧焦
动态模拟
乙烯
cracking furnace
decoking
dynamic simulation
ethylene
