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Heat Exchanger Network Retrofit of Diesel Hydrotreating Unit Using Pinch Analysis

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China Petroleum Processing & Petrochemical Technology 2021年第2期23卷 34-43页

作者： sun Mengying Zhang Fengjiao Liu Xinglong sun lanyi State Key Laboratory of Heavy Oil Processing College of Chemical EngineeringChina University of Petroleum(East China)Qingdao 266580

Diesel hydrotreating unit(DHT)is an integral part of the refinery,and its energy-saving optimization is of great significance to the enterprise.In this paper,process simulation software and energy management software are used to simulate the flowsheet and analyze the energy consumption,respectively.Stream data obtained from an existing DHT are applied in the pinch analysis for retrofitting the heat exchanger network(HEN)to achieve maximum energy utilization by using pinch analysis.Since DHT is constrained by pressure,the pressure factor is considered in the process of retrofitting.The results show that the amount of cross-pinch heat transfer is reduced,the inlet temperature of the furnace is increased by 55℃,and the amount of hot and cold utilities can be reduced by 70.25%and 50.16%,respectively.The economic evaluation indicates that the operating cost is saved by 4.39×10^(6)$/a,and the payback period is about 2 months.

关键词： pinch analysis pressure diesel hydrotreating unit heat exchanger network energy saving

A Novel Thermally Coupled Reactive Distillation Column for the Hydrolysis of Methyl Acetate

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China Petroleum Processing & Petrochemical Technology 2015年第2期17卷 101-108页

作者： Zhai Jian Liu Yuliang sun lanyi Wang Rujun State Key Laboratory of Heavy Oil Processing China University of Petroleum China Petroleum Engineering Co. Ltd.Beijing Company

A different pressure thermally coupled reactive distillation column(DPT-RD) for the hydrolysis of methyl acetate(Me Ac) is developed, and its design and optimization procedures are investigated. The sensitivity analysis is carried out to minimize the energy consumption, which is associated with the total annual cost(TAC). The influence of the proposed DPTRD scheme on energy consumption and economic efficiency are evaluated in comparison with the conventional reactive distillation column(CRD). Both the DPT-RD and CRD are simulated with the Aspen Plus?, and it can be observed that for the DPT-RD the energy consumption and the TAC are reduced, and the thermodynamic efficiency is increased as compared with the CRD process.

关键词：反应精馏塔热耦合醋酸甲酯水解 CRD法敏感性分析 Aspen 热力学效率

Optimization and Control of Extractive Distillation with Heat Integration for Separating Benzene/Cyclohexane Mixtures

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China Petroleum Processing & Petrochemical Technology 2016年第4期18卷 117-127页

作者： Li Lumin Tu Yangqin Guo Lianjie sun lanyi Tian Yuanyu State Key Laboratory of Heavy Oil Processing China University of Petroleum

In this work, the extractive distillation with heat integration process is extended to separate the pressure-insensitive benzene-cyclohexane azeotrope by using furfural as the entrainer. The optimal design of extractive distillation process is established to achieve minimum energy requirement using the multi-objective genetic algorithm, and the results show that energy saving for this heat integration process is 15.7%. Finally, the control design is performed to investigate the system's dynamic performance, and three control structures are studied. The pressure-compensated temperature control scheme is proposed based on the first two control structures, and the dynamic responses reveal that the feed disturbances in both flow rate and benzene composition can be mitigated well.

关键词：苯/环己烷混合物萃取精馏精馏分离优化设计控制设计多目标遗传算法压力敏感控制结构

Design and Control of Thermally Coupled Reactive Distillation Sequence for Biodiesel Production

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China Petroleum Processing & Petrochemical Technology 2016年第2期18卷 21-32页

作者： Li Lumin sun lanyi Xie Xu Tian Yanan Shang Jianlong Tian Yuanyu State Key Laboratory of Heavy Oil Processing China University of Petroleum Qingdao 266580 SINOPEC Research Institute of Petroleum Processing Beijing 100083

Decreasing petroleum reserves and growing alternative fuels requirements have promoted the study of biodiesel production. In this work, two thermally coupled reactive distillation designs for biodiesel production were investigated, and the sensitivity analysis was conducted to obtain the appropriate design values. The thermodynamic analysis and economics evaluation were performed to estimate the superiority of the thermally coupled designs over the base case. The proposed biodiesel production processes were simulated using the simulator Aspen Plus, and calculation results show that the exergy loss and economic cost in the two thermally coupled designs can be greatly reduced. It is found that the thermally coupled side-stripper reactive distillation design provides more economic benefits than the side-rectifier one. The dynamic performance of the thermally coupled side-stripper design was investigated and the results showed that the proposed control structure could effectively handle large feed disturbances.

关键词： thermally coupled reactive distillation biodiesel production thermodynamic analysis total annual cost control

Novel Control Structure Design of Differential Pressure Thermally Coupled Reactive Distillation for Methyl Acetate Hydrolysis

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China Petroleum Processing & Petrochemical Technology 2018年第3期20卷 85-95页

作者： Li Jun Zhou Hao Huang Xiaoqiao Zhao Tianlong Ma Zhanhua sun lanyi State Key Laboratory of Heavy Oil Processing China University of Petroleum Qingdao 266580 PetroChina Fuel Oil Company Limited Research Institute Beijing 100195

In this paper, the novel control structures of differential pressure thermally coupled reactive distillation process for methyl acetate hydrolysis were proposed. The RadFrac module of Aspen Plus was adopted in the steady-state simulation. Sensitive analysis was applied to find the stable initial value and provide a basis for the improved control structure design. The Aspen Dynamics software was adopted to study the process dynamic behaviors, and two novel control structures provided with feed ratio controllers and sensitive tray temperature controllers were proposed. The reflux ratio controllers were applied in the improved novel control structures. Both control structures abandoned the composition controllers that were replaced by simpler controllers with which the product purity could meet the specification requiring under a ± 20% disturbance to the total feed flowrate/MeAc composition.

关键词：控制结构设计反应蒸馏水解作用醋酸盐分压力温度控制器敏感分析蒸馏过程

Design, Optimization and Control of Extractive Distillation for Separation of Ethyl Acetate-Ethanol-Water Mixture Using Ionic Liquids

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China Petroleum Processing & Petrochemical Technology 2019年第1期21卷 123-132页

作者： Ma Shoutao Shang Xianyong Li Lumin Xue Changyong Li Jie sun lanyi State Key Laboratory of Heavy Oil Processing College of Chemical EngineeringChina University of Petroleum (East China) School of Resources and Chemical Engineering Sanming University

In this work, the process simulation of pressure-swing distillation(PSD) and extractive distillation(ED) using ionic liquid(IL) 1-butyl-3-methylimidazolium acetate([bmim][OAc]) as the entrainer for separation of ethyl acetateethanol-water mixture is performed. The design parameters of the two distillation processes are optimized with the minimum total annual cost(TAC) serving as the objective function. The results show that the TAC saving of ED process is 35.27% in comparison with that of PSD process in the case of achieving the same purity and yield of ethyl acetate.In addition, the dynamic controllability of ED process is further studied. The traditional two-point temperature control structure is proposed for the ED process, and it works pretty well while taking into account the disturbances in both feed rate and feed composition.

关键词： ionic liquids extractive distillation simulation process control

Design and Control of Self-Heat Recuperative Distillation Process for Separation of Close-Boiling Mixtures: n-Butanol and iso-Butanol

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China Petroleum Processing & Petrochemical Technology 2015年第4期17卷 111-120页

作者： Li Lumin Liu Yuliang Zhai Jian sun lanyi Tian Yuanyu State Key Laboratory of Heavy Oil Processing China University of Petroleum

In order to explore the advantages of self-heat recuperative distillation(SHRD) process, the design and control of the SHRD process was studied for the separation of n-butanol and iso-butanol mixtures. The economic superiority of SHRD process is presented when a comparison on the total annual cost(TAC) of the conventional distillation process, the vapor recompression distillation process and the SHRD process was made. For the SHRD process, 37.74% and 11.35% savings of TAC can be achieved as compared to the conventional distillation process and vapor recompression distillation process, respectively. The dynamic characteristics of this promising SHRD sequence had been studied, and the dynamic responses demonstrated that 10% changes in both feed flow rate and feed composition can be well handled by the control strategy with dual-temperature control. It is proven that the SHRD system not only can provide economical savings but also can operate normally with good controllability.

关键词：控制设计蒸馏工艺异丁醇正丁醇混合物分离换热自热

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结构参数对气液下喷式喷射器性能的影响研究

石油化工设备技术 2024年第3期45卷 11-17,I0001页

作者：薄守石徐子涵徐冉桑文蓉张其克孙兰义中国石油大学(华东) 山东青岛266580 山东正诺化工设备有限公司山东淄博255080

喷射环流反应器是一种新型的气液或气液固接触反应装置,其中的喷射器结构会对反应器性能产生重要影响。文章采用计算流体力学方法,建立了文丘里型喷射器的数学模型,分析了吸气室、喉部和扩散段等结构对喷射器吸气量的影响规律。模拟结... 详细信息

喷射环流反应器是一种新型的气液或气液固接触反应装置,其中的喷射器结构会对反应器性能产生重要影响。文章采用计算流体力学方法,建立了文丘里型喷射器的数学模型,分析了吸气室、喉部和扩散段等结构对喷射器吸气量的影响规律。模拟结果表明:吸气室直径和气相入口方式对吸气量影响不大;喷嘴与喉部之间距离越小,喉部长度越短,吸气量越高;扩散段扩散角度在2~4°之间时吸气量存在最大值。

关键词：喷射环流反应器计算流体力学文丘里喷射器

Composition control and temperature inferential control of dividing wall column based on model predictive control and PI strategies

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Chinese Journal of Chemical Engineering 2018年第5期26卷 1087-1101页

作者： Jianxin Wang Na Yu Mengqi Chen Lin Cong lanyi sun State Key Laboratory of Heavy Oil Processing College of Chemical Engineering China University of Petroleum (East China) College of Information and Control Engineering China University of Petroleum (East China)

The dividing wall column(DWC) is considered as a major breakthrough in distillation technology and has good prospect of industrialization. Model predictive control(MPC) is an advanced control strategy that has acquired extensive applications in various industries. In this study, MPC is applied to the process for separating ethanol,n-propanol, and n-butanol ternary mixture in a fully thermally coupled DWC. Both composition control and temperature inferential control are considered. The multiobjective genetic algorithm function "gamultiobj" in Matlab is used for the weight tuning of MPC. Comparisons are made between the control performances of MPC and PI strategies. Simulation results show that although both MPC and PI schemes can stabilize the DWC in case of feed disturbances, MPC generally behaves better than the PI strategy for both composition control and temperature inferential control, resulting in a more stable and superior performance with lower values of integral of squared error(ISE).

关键词：先进控制策略基于模型 PI 预兆推论温度 Matlab 墙