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Microchannel reactors for Fischer-Tropsch synthesis:Experimental investigation and mathematical modeling

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Chinese Journal of Chemical Engineering 2023年第12期64卷 224-240页

作者： Huili Cao Run Xu xiaojin tang Tao Yang Shuandi Hou Chaopeng Hou SINOPEC Research Institute of Petroleum Processing Co. Ltd.Beijing 100083China

The Fischer-Tropsch synthesis is a significant technology for converting coal,natural gas,and biomass into synthetic fuels.In recent years,the use of microchannel reactors for the Fischer-Tropsch synthesis has attracted significant attention.Fischer-Tropsch synthesis experiments were carried out in a microchannel reactor and the influences of reaction conditions on the experimental results were investigated in this study.Based on the experimental data,a dynamic multi-component pseudo-homogeneous variable-volume flow model of microchannel reactors for the Fischer-Tropsch synthesis was built to determine the pressure-,velocity-,conversion-and(component-wise)concentration-distributions in reaction channels.The model takes into account the combined effects of gas volume expansion caused by the frictional pressure drop and gas volume contraction caused by reaction consumption.A novel effective method for calculating the pressure and superficial gas velocity values in microchannel reactors was proposed in the model.Besides that,two sets of experimental data were selected from references to evaluate the validity and accuracy of the model.The reaction performances in the microchannels were analyzed carefully based on the calculated results.

关键词： Fischer-Tropsch synthesis Microchannel reactors Modeling Variable-volume flow

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气升式浆态床外环流反应器流体力学性能研究

石油炼制与化工 2024年第6期55卷 115-121页

作者：边清唐晓津杨涛中石化石油化工科学研究院有限公司北京100083 中国石化齐鲁分公司氯碱厂

针对气含率和浆液循环流速两个关键流体力学参数,系统研究了气升式浆态床外环流反应器的流体力学特性,掌握了气含率与浆液循环流速的变化规律。验证了体积膨胀法、压差法和电导探针法测量气含率的方法准确性。研究了气体分布器结构对气... 详细信息

针对气含率和浆液循环流速两个关键流体力学参数,系统研究了气升式浆态床外环流反应器的流体力学特性,掌握了气含率与浆液循环流速的变化规律。验证了体积膨胀法、压差法和电导探针法测量气含率的方法准确性。研究了气体分布器结构对气升式浆态床外环流反应器流体力学特性的影响,结果表明开孔向下双环管分布器的综合性能最优。气含率与浆液循环液速之间存在线性关系,建立了预测浆液循环流速的计算式,计算误差基本小于20%。

关键词：气升式浆态床外环流反应器流体力学气含率浆液循环流速

Modeling of C_(8) Aromatics Isomerization in a Radial Bed Reactor

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China Petroleum Processing & Petrochemical Technology 2022年第2期24卷 112-117页

作者： Gao Ninghan tang xiaojin Zhou Zhenhuan Xu Jian SINOPEC Research Institute Of Petroleum Processing Beijing 100083 China University of petroleum-Beijing Beijing 102249

Reactor models were developed to describe the isomerization reaction process of C_(8) aromatics by applying a six-component sequential reaction network.Lab-scale experimental data were used in an axial bed reactor model,and dynamic parameters were fitted by simulated annealing algorithm.In addition,industrial data and calculated dynamic parameters were used to determine the six-component concentration distributions using a radial reactor model.The influence of back-mixing on reaction performance was investigated.It was found that the model considering back-mixing was much closer to the real industrial reaction process.

关键词： Isomerization of C_(8)aromatics reactor model radial bed reactor

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基于足迹理论的钢铁企业低碳选址评价方法

工业安全与环保 2024年第7期50卷 99-106页

作者：李锐阚硕左精力唐晓进宋金昭西安建筑科技大学土木工程学院陕西西安710055 宝钢工程技术集团有限公司上海201999 西安建筑科技大学管理学院陕西西安710055

为推动钢铁企业在资源约束下完成产业升级,在环境约束下提升技术效率,提出一种基于足迹理论的钢铁企业低碳选址评价方法。首先,在钢铁企业常规选址指标的基础上,以足迹理论表征的环境支持力和压力指标为切入点,客观评估待选地区环境容... 详细信息

为推动钢铁企业在资源约束下完成产业升级,在环境约束下提升技术效率,提出一种基于足迹理论的钢铁企业低碳选址评价方法。首先,在钢铁企业常规选址指标的基础上,以足迹理论表征的环境支持力和压力指标为切入点,客观评估待选地区环境容量对新建厂址的容许程度,利用改进灰色关联度完成指标定量筛选,构建钢铁企业低碳选址评价体系。其次,运用差异系数法将主客观权重进行组合优化,采用可拓云模型求解选址综合评价等级隶属度和特征值,并结合可信度因子进行检验。最后,以某钢铁企业产能置换选址为例,确定待选厂址的评价等级。该方法在钢铁企业低碳选址综合评价中具有较好的可行性和适用性。

关键词：低碳选址足迹理论指标筛选组合赋权可拓云模型

Study of Macro-Mixing in a Microreactor

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China Petroleum Processing & Petrochemical Technology 2023年第4期25卷 117-126页

作者： Cao Huili tang xiaojin Bao Di Hou Shuandi SINOPEC Research Institute of Petroleum Processing Co. Ltd.Beijing 100083 SINOPEC(Dalian)Research Institute of Petroleum and Petrochemicals Co. Ltd.Dalian 116045

The transfer rate between fluids in a microreactor is directly influenced by the mixing within the reactor, which subsequently impacts the reaction rate. This paper investigates the flow behavior and macro-mixing performance in a microreactor. First, the flow performance of the Ehrfeld Miprowa microreactor is studied. Cold experiments are conducted to examine fundamental flow laws and verify the accuracy of the chosen computational fluid dynamics simulation model.Subsequently, macro-mixing performance in the microreactor, both with and without internal components, is investigated through both experiment and simulation. A bromocresol violet–NaOH–H2SO4 system is utilized in the macro-mixing experiments, which explore the effects of flow rate and internal components on macro-mixing. The Navier–Stokes equation is adopted as the computational model for macro-mixing simulations, which also consider the mass transfer and diffusion of tracer. The simulation results are in good agreement with the experimental results. Both experimental and simulation results demonstrate that the presence of internal components in the microreactor enhance its macro-mixing performance.

关键词： microreactor flow model macro-mixing

Hydrodynamic Characteristics of Xenon Bubbles in a Bubble Column

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China Petroleum Processing & Petrochemical Technology 2019年第3期21卷 90-93页

作者： tang xiaojin SINOPEC Research Institute of Petroleum Processing

Xenon was used as the gas phase to investigate the hydrodynamic characteristics in a bubble column.It was found that the flow pattern is mainly in the churn-turbulent flow regime through analysing the relationship between the slip velocity and gas holdup.The influence of operating conditions on the gas holdup and the Sauter mean diameter was studied.The experimental results show that the Sauter mean diameter decreases with the increase of energy dissipation rate.A new correlation was developed to predict the Sauter mean diameter with an average error of less than 15%.

关键词： xenon bubble column hydrodynamics mean bubble diameter

Flow Characteristics in an External-Loop Airlift Slurry Reactor

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China Petroleum Processing & Petrochemical Technology 2012年第1期14卷 46-49页

作者： tang xiaojin Research Institute of Petroleum Processing SINOPEC Beijing 100083

The local flow characteristics in an external-loop airlift slurry reactor were investigated.The axial profiles of the local gas holdup,the Sauter mean diameter and the rise velocity were obtained.It was found that the bubble size and rise velocity were influenced by the solid holdup,and the bubble coalescence was enhanced by the increase of the solid holdup.A new correlation was used to predict the slip velocity between the gas phase and the slurry phase by taking into account the local gas holdup,the bubble size,and the physical properties of the experimental system.By using this correlation,the local drag coefficient can be calculated in the bubble swarm.

关键词：流动特性浆态床环流索特平均直径局部阻力系数上升速度泥浆反应器轴向分布

Modelling of Microchannel Reactors for Fischer-Tropsch Synthesis

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China Petroleum Processing & Petrochemical Technology 2020年第2期22卷 93-101页

作者： Cao Huili tang xiaojin SINOPEC Research Institute of Petroleum Processing Beijing 100083

The Fischer-Tropsch synthesis is an important step in coal liquefaction,natural gas liquefaction,and biomass liquefaction.In recent years,the use of microchannel reactors for Fischer-Tropsch synthesis has received widespread attention.Since thermocouples and other sensors cannot be placed easily in a microchannel reactor,it is very vital to establish a model to provide calculated results highly compatible with the experimental data.This paper mainly introduces the establishment and solution of microchannel reactor models for Fischer-Tropsch synthesis.General mass transfer differential equations,heat transfer differential equations and related parameters(such as reaction rates,dispersion coefficient,and convective heat transfer coefficient)are listed.To solve the models,numerical solutions,such as the CFD simulation methods and the programming methods,are reviewed.It is recommended that a more accurate solution strategy is the combination of CFD simulation and programming methods.

关键词： Fischer-Tropsch synthesis microchannel reactor modelling

Numerical Simulation of Optimization of Mixing Tank for Residue Upgrading Reactor

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China Petroleum Processing & Petrochemical Technology 2019年第2期21卷 110-117页

作者： Bao Di tang xiaojin Zhu Zhenxing SINOPEC Research Institute of Petroleum Processing

For studying the mixing tank for RMAC (residue upgrading to maximize asphaltene conversion) reactor, the CFD simulation was employed to simulate the flow field in the mixing tank. The dispersion of liquid-liquid phase in the mixing tank and the power of turbines were investigated. The simulation results showed that compared with the original doublelayer propeller, the A310-swept double-layer impellers could reduce the liquid heterogeneous degree by 27.5% and the stirring power by 3.25%. The influence of rotation speed on the heterogeneous degree and stirring power was investigated, and the critical rotation speed was obtained. The optimal rotation speed was determined to be 240 r/min. The heterogeneous degree was 0.19 and the minimum stirring power was 10.89 W. By optimizing the impeller selection and process conditions, the overall performance of the mixing tank could be significantly improved.

关键词： liquid-liquid mixing impellers numerical simulation critical rotation speed