加氢裂化装置反应器径向温差原因分析与探讨  

Cause analysis and discussion of radial temperature difference of reactor in hydrocracking unit

作　　者：黎臣麟 Li Chenlin(PetroChina Sichuan Petrochemical Co.,LTD.,Chengdu,Sichuan 611930)

机构地区：[1]中国石油四川石化有限责任公司

出　　处：《炼油技术与工程》2019年第12期6-10,共5页Petroleum Refinery Engineering

摘　　要：某蜡油加氢裂化装置在高负荷高转化率工况下,裂化反应器第一床层径向温差达到10℃,是由于单床层采用2种不同尺寸与不同活性的催化剂级配,反应气化率变化加剧,不利于径向液体分布,从而使径向温差偏大;柴油加氢裂化装置第二床层径向温差达到20℃,在一定范围内,其径向温升与轴向床层温升呈正比,与冷氢流量呈反比,是由于单床层采用4种不同尺寸与不同活性的催化剂级配,反应器内径向气、液相分布不均匀,径向局部液体流量不均匀,导致反应器床层径向温差增大。通过提高催化剂装填质量,建立实际模型,加强对操作参数监控,降低反应器的径向温差,从而提高催化剂的利用率,降低操作难度,实现装置的长周期运行。The radial temperature difference of the first bed of the wax oil hydrogenation cracking unit at high load and high conversion rate reaches 10℃.The reason is that the change of reaction gasification rate is aggravated by the use of catalyst gradation of two different sizes and different activities in the single bed layer,which is not conducive to the distribution of radial liquids,thus the radial temperature difference is larger.The radial temperature of the second bed of the diesel hydrocracking device reaches 20℃.Within a certain range,the radial temperature rise is proportional to the axial bed temperature rise,and it is inversely proportional to the cold hydrogen flow.Because the single bed layer adopts four catalyst levels with different sizes and different activities,the radial gas and liquid phase distribution in the reactor is uneven,and the radial local liquid flow is uneven,resulting in an increase in the radial temperature difference of the reactor bed layer.By improving the quality of catalyst filling,establishing the actual model,strengthening the monitoring of operating parameters,reducing the radial temperature difference of the reactor,thus improving the utilization rate of the catalyst,reducing the difficulty of operation,and realizing the long-term operation of the device.

关 键 词：加氢裂化 径向温差 反应器内构件 气液分布 催化剂装填 氢油比 

分 类 号：TE6[石油与天然气工程—油气加工工程]