摘要
延迟焦化是重要的重油加工工艺,而加热炉是延迟焦化的核心装置。以国内某炼化企业的延迟焦化加热炉为例,模拟研究了工况变化对加热炉辐射段运行效果的影响,得到了沿加热炉炉管轴向的关键运行参数的变化规律,并在此基础上研究了加热炉炉管的结焦规律。模拟结果表明:随着炉管长度增加,在第三注汽点前,管内介质的流速、汽化率、温度、转化率、炉管结焦层厚度均逐渐增加;在第三注汽点后,介质流速和汽化率快速增加,介质温度和转化率增速减小,第三注汽点下游炉管的结焦层厚度沿炉管先减小后增大,原因在于温升加剧结焦的作用逐渐抵消了流速增加减缓结焦的作用;在介质温度相近的情况下,高循环比减缓炉管结焦的效果好于低循环比。
Delayed coking is an important technology of heavy oil processing.The furnace is the core device of delayed coking units.Taking the delayed coking furnace of a domestic petrochemical enterprise as an example,the influence of working condition changes on the operation of the radiation section of the furnace was studied by simulation.The rule about the variation law of key operating parameters along the axial direction of the furnace tubes was obtained.On this basis,the coking law of furnace tubes was also studied.The results showed that the parameters including velocity of flow,vaporization rate,temperature,conversion rate of fluid and thickness of coking layer in furnace tube gradually increased along the length of the furnace tube increased before the third steam injection point.The velocity of fluid and vaporization rate of fluid rapidly increased,temperature and conversion growth rate of fluid decreased,especially the thickness of coking layer first decreased and then increased along the length of the furnace tube increased after the third steam injection point.The reason lied in the fact that the intensifying effect of temperature rise on coking gradually offset the mitigating effect of speed reduction on coking.When the fluid temperature was similar,a high recycle ratio was more effective than a low recycle ratio in slowing down coke formation in furnace tubes.
作者
余建明
阎龙
王宝金
Yu Jianming;Yan Long;Wang Baojin(SINOPEC Maoming Company,Maoming,Guangdong 525000;SINOPEC Research Institute of Petroleum Processing Co.,Ltd.;SINOPEC Shanghai Petrochemical Co.,Ltd.)
出处
《石油炼制与化工》
北大核心
2026年第1期88-93,共6页
Petroleum Processing and Petrochemicals
基金
中国石油化工股份有限公司合同项目(124001)。
关键词
延迟焦化
加热炉
结焦
模拟
循环比
delayed coking
furnace
coking
simulation
recycle ratio
