提升管反应器油剂间传热传质及混合特性研究
Research on heat transfer,mass transfer and mixing characteristics between oil and catalyst in riser reactor
崔凌云 1王松江 1李国智 1刘璐1
作者信息
- 1. 中石化炼化工程(集团)股份有限公司洛阳技术研发中心,河南 洛阳 471000
- 折叠
摘要
以某炼厂180 万t/a催化裂化装置提升管为模型,通过数值模拟研究了催化裂化初始原料油液雾(简称油雾)粒径对提升管反应器油剂间传热传质及混合特性的影响.结果显示,35 μm油雾与70 μm油雾相比,在低高度段油雾温度更低,且温度分布更加均匀;同一高度段油雾粒径越小油雾蒸发速度更快,35 μm油雾达到 98%蒸发量所需时间几乎是 70 μm油雾的一半;对于35 μm油雾来说,催化剂在提升管中心的聚集效应较弱,在不同高度横截面上比 70 μm油雾的固含率低,且油气在横截面上分布的更加均匀,促使原料油与催化剂的均匀混合,有利于催化裂化反应,改善产品分布.
Abstract
Taking the riser at a 1.8 million ton/year catalytic cracking unit in a certain refinery as a model,the numerical simulation method is employed to study the influences of initial feedstock oil mist(referred to as"oil mist")particle size on heat transfer,mass transfer and mixing characteristics between catalyst and oil in a riser reactor for catalytic cracking.Results show that compared to 70 μm oil mist,35 μm oil mist has lower temperature in low section of the riser,showing a more uniform temperature distribution.In the same height range,35 μm oil mist has a smaller particle size,vaporizes faster,and spends the time that reaches 98%evaporation capacity is almost half that 70 μm oil mist spends.And 35 μm oil mist has weaker catalyst aggregation effect at the center of the riser,lower solid holdup than 70 μm oil mist in different cross section.In addition,35 μm oil mist is more conductive to the distribution of oil gas,the mixing between feedstock oil and catalyst,the catalytic cracking reactions,and improving products distribution.The conclusion provides support for the design of riser reactors and nozzles.
关键词
催化裂化/提升管/液雾粒径/传热传质/混合特性/反应器/喷嘴Key words
catalytic cracking/riser/oil mist particle size/heat and mass transfer/mixing characteristics/reactor/nozzle引用本文复制引用
基金项目
中国石油化工集团有限公司项目(JKL21007)
出版年
2024
NETL
NSTL
万方数据