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Configuring topologically optimum vapor recompressed dividing-wall distillation columns to maximize operating efficiency

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Chinese Journal of Chemical Engineering 2023年第5期57卷 247-264页

作者： Kejin Huang Shuaishuai Han lijing zang Haisheng Chen Yihang Luo Liang Zhang Yang Yuan Xing Qian Shaofeng Wang College of Information Science and Technology Beijing University of Chemical TechnologyBeijing 100029China

For dividing-wall distillation columns(DWDCs) separating a heavy-component dominated and wide boiling-point ternary(HCDWBT) mixture, a significant amount of excessive heat exists inevitably in stripping the heavy-component from the intermediate-component and it can be employed to initiate the development of vapor recompression heat pump(VRHP) assisted DWDC(VRHP-DWDC). Despite dividing wall may locate in the top, middle, and bottom, the optimum VRHP-DWDC is found to involve uniformlytwo VRHP circles. While the first one serves to compress and transform the excessive heat resulted from the separation of the heavy-component from the intermediate-component, the second one to compress and transform the overhead vapor stream of the light-component pre-heated sequentially with the condensate from the first one and the bottom product stream of the heavy-component, both releasing the temperature-elevated latent heat to the pre-fractionator's or common stripping section. The processing of two HCDWBT mixtures of benzene/toluene/o-xylene and n-pentane/n-hexane/n-heptane are selected to assess the derived optimum topological configurations of the VRHP-DWDC and their optimality is confirmed through detailed comparisons with the DWDC and two VRHP-DWDCs involving only one VRHP circle. The proposed strategy helps to tap the full potential of the VRHP-DWDC with considerably alleviated complication in process development.

关键词： dividing-wall distillation columns Heavy-component dominance Vapor recompression heat pump Process development Economic behavior

Enhanced temperature difference control of distillation columns based on the averaged absolute variation magnitude

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Chinese Journal of Chemical Engineering 2021年第1期34卷 266-278页

作者： Yang Yuan Kejin Huang Xing Qian Haisheng Chen lijing zang Liang Zhang College of Information Science and Technology Beijing University of Chemical TechnologyBeijing 100029China

Temperature difference control(TDC)schemes can clearly suppress the adverse influence of pressure variations on product quality control of various distillation columns(DCs)by employing temperature differences(TDs)between the sensitive stage temperature(T_(S))and reference stage temperature(T_(R)),i.e.,T_(S)-T_(R),to infer the controlled product ***,because the TDC scheme has failed to specially take the corresponding relationship between the TD employed in each control loop and the controlled product quality into account,it may suffer from relatively large steady-state errors in the controlled product *** address this problem,an enhanced TDC(ETDC)scheme is proposed in the current article,in which an enhanced TD(ETD),i.e.,T_(S)-α×T_(R),is employed to replace the conventional TD for each control *** the locations of the sensitive and reference stages of the ETD are respectively determined according to sensitivity analysis and SVD analysis,the adjusted coefficientαis set to be the ratio between the averaged absolute variation magnitudes(AAVMs)of the T_(S)and T_(R)so that the relationship between the T_(S)and T_(R)can be appropriately *** reference to the operations of three different distillation systems,i.e.,one conventional DC distilling an ethanol(E)/butanol(B)binary mixture,one conventional DC distilling an E/propanol(P)/B ternary mixture,and one dividing-wall distillation column distilling an E/P/B ternary mixture,the performance of the ETDC scheme is assessed by compared with the conventional TDC scheme and the double TD control(DTDC)*** dynamic simulation results show that the ETDC scheme is better than the conventional TDC scheme with reduced steady-state errors in the controlled product qualities and improved dynamic responses,and is comparable with the DTDC scheme despite the less temperature measurements are employed.

关键词： Distillation column Temperature difference AAVM Temperature inferential control Process control

Vapor recompressed dividing-wall distillation columns:Structure and performance

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Chinese Journal of Chemical Engineering 2020年第7期28卷 1891-1897页

作者： lijing zang Kejin Huang Yang Yuan Xing Qian Liang Zhang Haisheng Chen ShaofengWang College of Information Science and Technology Beijing University of Chemical TechnologyBeijing 100029China

Due to the topological structure of double columns and multiple separating sections in dividing-wall distillation columns(DWDCs),the development of vapor recompressed dividing-wall distillation columns(DWDC-VRHPs)represents a challenging issue with great complexities and *** the separations of light-component dominated and wide boiling-point ternary mixtures,because the purification of the light-component from the intermediate-and heavy-components incurs the primary energy dissipation,the application of vapor recompressed heat pumps(VRHP)should be aimed to reduce the irreversibility and this leads to the generation of the optimum topological structures of the DWDC-VRHPs,i.e.,a DWDC plus a two-stage *** first-stage VRHP is to preheat feed,not only taking the advantages of the small temperature elevation available but also favoring the mass transfer between the vapor and liquid phases through feed *** second-stage VRHP is to reduce further separation *** philosophy can be applied to any DWDCs no matter where the dividing wall *** case studies on the separations of ternary mixtures of benzene,toluene,and o-xylene and n-pentane,n-hexane,and n-heptane demonstrate the economic optimality of the proposed DWDC-VRHPs and reveal the inherent interplay between internal and external process integration.

关键词： Dividing-wall distillation column Light-compoment dominance Vapor recompressed heat pump Process design Process operability

Temperature inferential control of a reactive distillation column with double reactive sections

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Chinese Journal of Chemical Engineering 2019年第4期27卷 896-904页

作者： lijing zang Kejin Huang Ting Guo Yang Yuan Haisheng Chen Liang Zhang Xing Qian Shaofeng Wang College of Information Science and Technology Beijing University of Chemical Technology

Temperature inferential control (TIC) is studied for a reactive distillation column with double reactive sections (RDC-DRSs) processing a hypothetical two-stage consecutive reversible reaction (A + B■C + D, C + B■E + D with αD > αB > αC > αA > αE). Because of the complicated dynamic behaviors, the controlled stages by sensitivity analysis lead to great steady-state deviations (SSDs) in top and bottom product purities. Since TIC involves considerably reduced settling times in comparison with direct composition control, small SSDs in product qualities correspond generally to small transient deviations (TDs) in product qualities. An objective function that measures SSDs in product qualities is formulated to represent the performance of a TIC system and an iterative procedure is devised to search for the best control configuration. The application of the procedure to the RDC-DRS gives considerably suppressed TDs and SSDs in top and bottom product qualities as compared with the one by sensitivity analysis. The method is simpler in principle and less computationally intensive than the current practice. These striking outcomes show the effectiveness of the proposed principle for the development of TIC systems for complicated reactive distillation columns.

关键词： Reactive distillation column Temperature inferential control Sensitivity analysis Transient deviation Steady-state deviation

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功能箱包研发途径的探讨

北京皮革 2022年第9期47卷 54-59页

作者：吴东利臧莉静马英华河北科技工程职业技术大学学河北邢台054035 河北省服装个性化定制技术创新中心河北邢台054035

针对大众人群、学生人群、商务人群等6类消费人群的多元化、个性化消费需求,从基本功能、特定功能、附加功能方面对功能箱包产品设计研发进行探讨。基于互联网、大数据、新材料等在功能箱包设计中的创新应用,展望了未来功能性箱包的发... 详细信息

针对大众人群、学生人群、商务人群等6类消费人群的多元化、个性化消费需求,从基本功能、特定功能、附加功能方面对功能箱包产品设计研发进行探讨。基于互联网、大数据、新材料等在功能箱包设计中的创新应用,展望了未来功能性箱包的发展趋势。

关键词：功能箱包研发个性化需求

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Mg(OH)2阻燃棉织物的制备及阻燃性能

印染助剂 2020年第4期37卷 24-27页

作者：臧莉静张静邢台职业技术学院河北邢台054035

以MgCl2为原料制备Mg(OH)2晶种,采用二次生长法得到Mg(OH)2阻燃棉织物[Mg(OH)2负载棉织物]。通过X射线衍射仪和扫描电镜对阻燃棉织物的结构形貌进行表征,结果表明:Mg(OH)2为六方结构,均匀地附着在棉织物表面;热稳定性能、阻燃性能和耐... 详细信息

以MgCl2为原料制备Mg(OH)2晶种,采用二次生长法得到Mg(OH)2阻燃棉织物[Mg(OH)2负载棉织物]。通过X射线衍射仪和扫描电镜对阻燃棉织物的结构形貌进行表征,结果表明:Mg(OH)2为六方结构,均匀地附着在棉织物表面;热稳定性能、阻燃性能和耐水洗性能研究结果表明:Mg(OH)2负载棉织物具有良好的阻燃和耐水洗性能,火焰移开后无明火燃烧,阴燃时间仅为2 s,燃烧部分成炭并基本保持了原有形貌。Mg(OH)2负载棉织物具有良好的阻燃性能主要归因于Mg(OH)2分解后产生水和MgO可吸收热量,并避免直接燃烧棉织物。

关键词：氢氧化镁二次生长阻燃耐水洗

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有机抗菌剂应用于纺织品的研究进展

印染助剂 2019年第3期36卷 11-14页

作者：张静臧莉静邢台职业技术学院河北邢台054035

介绍了有机抗菌剂的抗菌机理,着重论述了季铵盐类、卤胺化合物、聚六亚甲基双胍盐酸盐类、甜菜碱类和有机天然抗菌剂应用于纺织品的研究进展,讨论了有机抗菌剂应用于纺织品的难点和未来的发展方向。

关键词：有机抗菌剂抗菌机理纺织品

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去鳞片羊毛面料的性能研究

毛纺科技 2018年第6期46卷 38-41页

作者：孙超臧莉静孟方邢台职业技术学院河北邢台054035

通过测试羊毛面料去除鳞片前后羊毛面料的导热系数、热学、湿润、毡缩率及力学性能,分析剥鳞处理对羊毛面料保暖、热学稳定性、吸湿导汗、染色、防毡缩及力学性能的影响。研究表明:经过剥鳞处理后羊毛面料的导热系数、热学稳定性与力学... 详细信息

通过测试羊毛面料去除鳞片前后羊毛面料的导热系数、热学、湿润、毡缩率及力学性能,分析剥鳞处理对羊毛面料保暖、热学稳定性、吸湿导汗、染色、防毡缩及力学性能的影响。研究表明:经过剥鳞处理后羊毛面料的导热系数、热学稳定性与力学性能有所下降,但仍具有较好的服用性能;剥鳞后面料的湿润及防毡缩性能有较大改善;由此得出羊毛面料剥鳞处理提高了面料的保暖、吸湿导汗、尺寸稳定性与染色性能,可极大改善羊毛面料的服用性能。

关键词：去鳞片羊毛面料导热系数湿润毡缩

轻组分绝对占优的蒸汽再压缩隔离壁蒸馏塔的最优拓扑结构

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化工学报 2020年第4期71卷 1696-1711页

作者：臧立静黄克谨苑杨钱行张亮王韶峰陈海胜北京化工大学信息科学与技术学院北京100029

隔离壁蒸馏塔(DWC)的双塔多段拓扑结构导致蒸汽再压缩热泵(VRHP)的应用具有多种可能性,包括单VRHP、多VRHP、多级VRHP以及它们的相互组合等复杂结构,这显著加剧了蒸汽再压缩隔离壁蒸馏塔(DWC-VRHP)综合与设计的复杂性与烦琐性。为解决... 详细信息

隔离壁蒸馏塔(DWC)的双塔多段拓扑结构导致蒸汽再压缩热泵(VRHP)的应用具有多种可能性,包括单VRHP、多VRHP、多级VRHP以及它们的相互组合等复杂结构,这显著加剧了蒸汽再压缩隔离壁蒸馏塔(DWC-VRHP)综合与设计的复杂性与烦琐性。为解决这一问题,针对轻组分绝对占优的三元宽沸点物系的分离问题推演了DWC-VRHP的最优拓扑结构,由此能够有效回避系统综合与设计过程中的结构搜索问题并显著降低模型化与搜索计算的工作强度。轻组分绝对占优与宽沸点物性导致了塔顶冷凝器与预分离蒸馏塔的提馏段是主要的热源与热阱,也决定了DWC-VRHP的最优拓扑结构,即一个二级VRHP与DWC的耦合系统。第一级VRHP用于进料预热,既充分利用温度提升跨度小的特点,又可以通过进料分流强化气液相间的物质传递。第二级VRHP用于加热预分离蒸馏塔的提馏段(或公共提馏段),能够最大限度地降低分离操作的非可逆性。采用苯/甲苯/邻二甲苯和正戊烷/正己烷/正庚烷两个物系的分离问题对所提出的DWC-VRHP的最优拓扑结构进行了分析与验证。通过与DWC以及DWC-VRHP其他潜在结构的系统性比较,显示了所提出系统结构在稳态性能方面的优越性。

关键词：隔离壁蒸馏塔蒸汽再压缩热泵轻组分绝对占优宽沸点物系综合与设计