石脑油催化裂解结构化反应器反应特性的CFD模拟  

CFD simulation of naphtha catalytic cracking reaction in monolith reactors

作　　者：许敏 刘辉[1] 王红霞[1] Xu Min;Liu Hui;Wang Hongxia(State Key Laboratory of Chemical Resource Engineering,Beijing Key Laboratory of Energy Environmental Catalysis,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]北京化工大学,化工资源有效利用国家重点实验室,能源环境催化北京市重点实验室,北京100029

出　　处：《工业催化》2018年第5期127-132,共6页Industrial Catalysis

摘　　要：以石脑油为原料,采用催化裂解六集总动力学模型,建立描述结构化反应器内催化裂解的反应器数学模型,并利用CFD软件对结构化反应器内的石脑油催化裂解性能进行数值模拟。通过改变孔道直径、反应器长度以及反应器内温度、气体入口速率考察反应器结构尺寸和反应条件对目标产物乙烯、丙烯的收率及石脑油转化率的影响。结果表明,反应器孔道直径的增加,目标产物收率减小,反应器长度20 mm时反应完全,升高反应温度和增大入口速率均有利于目标产物的生成。在入口温度680℃和入口速率0.4 m·s-1条件下,石脑油转化率92%,乙烯收率19.3%,丙烯收率23.1%。而在相同反应条件下的固定床反应器中乙烯收率10.3%,丙烯收率13.3%,石脑油转化率80.0%。Mathematic model for naphtha catalytic cracking in monolith reactor is established using six lumped kinetics by CFD simulations.Effects of reactor size and reaction conditions on yield of ethylene,propylene and naphtha conversion are investigated by changing channel diameter,reactor length,reaction temperature and gas inlet velocity.The results show that increase in channel diameter leads to decrease of products yield.Reaction completes at channel length around of 20 mm.Increasing in reaction temperature and entrance velocity are beneficial to production of target products.The monolith reactor can achieve a propylene yield up to 23.1%and ethylene yield to 19.3%with a naphtha conversion being 92%at 680℃and 0.4 m·s-1;this is in contrast to a typical fixed reactor under the same reaction conditions,in which case the ethylene yield is 10.3%,the propylene yield is 13.3%,and the conversion rate of naphtha was 80.0%.

关 键 词：石油化学工程 石脑油 集总动力学模型 催化裂解 结构化反应器 数值模拟 

分 类 号：TE624.4[石油与天然气工程—油气加工工程] O643.12[理学—物理化学]