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甲醇精馏塔静态模型分析与仿真设计
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作者 肖东彩 梁杨杨 +1 位作者 周润兵 刘晓阳 《广州化工》 CAS 2022年第24期156-159,共4页
以甲醇精馏四塔双效工艺流程为研究对象,基于物料平衡和能量守恒,分析影响甲醇精馏的过程参数,并将甲醇精馏过程分塔顶、塔板、塔釜、再沸器、冷凝器等几部分,分别对其进行静态数学模型的构建。分别使用Kingview和Aspen plus在进料量温... 以甲醇精馏四塔双效工艺流程为研究对象,基于物料平衡和能量守恒,分析影响甲醇精馏的过程参数,并将甲醇精馏过程分塔顶、塔板、塔釜、再沸器、冷凝器等几部分,分别对其进行静态数学模型的构建。分别使用Kingview和Aspen plus在进料量温度为45℃、55℃下进行静态仿真。运行的数据结果相差较小,验证了甲醇精馏塔静态模型的准确性,对于精馏过程的分析以及控制的深入研究有一定的意义。 展开更多
关键词 甲醇馏塔 仿真 精态模型
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A Quasi-steady-state Model for Numerical Simulation of Batch Extractive Distillation 被引量:2
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作者 方静 李春利 +1 位作者 王洪海 孙立军 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2010年第1期43-47,共5页
Batch extractive distillation(BED)is a special method used in the distillation process by adding a solvent into the batch distillation column to alter the relative volatility of the components and improve the separati... Batch extractive distillation(BED)is a special method used in the distillation process by adding a solvent into the batch distillation column to alter the relative volatility of the components and improve the separation. A comprehensive design and simulation method is required due to the complexity of BED.In this study,a quasi-steady-state model for BED is proposed,the derivation and solution of the model are presented.This shortcut model can be used to simulate the composition and temperature of the reboiler,the top and other plates of the column in a batch extractive distillation operation.The calculated values are in good agreement with the experimental data.The results show that the quasi-steady-state model is a practical method because of some advantages such as high precision and fast calculation. 展开更多
关键词 batch distillation extractive distillation SIMULATION MODEL
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Landscape change detection in Yulin prefecture 被引量:2
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作者 ZHANJinyan DENGXiangzheng YUETianxiang 《Journal of Geographical Sciences》 SCIE CSCD 2004年第1期47-55,共9页
Landscape is a dynamic phenomenon that almost continuously changes. The overall change of a landscape is the result of complex and interacting natural and spontaneous processes and planned actions by man. However, num... Landscape is a dynamic phenomenon that almost continuously changes. The overall change of a landscape is the result of complex and interacting natural and spontaneous processes and planned actions by man. However, numerous activities by a large number of individuals are not concerted and contribute to the autonomous evolution of the landscape in a similar way as natural processes do. There is a well-established need to detect land use and ecological change so that appropriate policies for the regional sustainable development can be developed. Landscape change detection is considered to be effectively repeated surveillance and needs especially strict protocols to identify landscape change. This paper developed a series of technical frameworks on landscape detection based on Landsat Thematic Mapper (TM) Data. Through human-machine interactive interpretation, the interpretation precision was 92.00% in 1986 and 89.73% in 2000. Based on the interpretation results of TM images and taking Yulin prefecture as a case study area, the area of main landscape types was summarized respectively in 1986 and 2000. The landscape pattern changes in Yulin could be divided into ten types. 展开更多
关键词 LANDSCAPE remote sensing data Yulin prefecture
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Dynamic error research and application of an angular measuring system belonging to a high precision excursion test turntable
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作者 邓辉宇 王欣利 马培荪 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2006年第2期156-159,共4页
Angular measuring system is the most important component of a servo turntable in inertial test apparatus. Its function and precision determine the turntable' s function and precision. It attaches importance to resear... Angular measuring system is the most important component of a servo turntable in inertial test apparatus. Its function and precision determine the turntable' s function and precision. It attaches importance to research on inertial test equipment. This paper introduces the principle of the angular measuring system using amplitude discrimination mode. The dynamic errors axe analyzed from the aspects of inductosyn, amplitude and function error of double-phase voltage and wavefonn distortion. Through detailed calculation, theory is provided for practical application; system errors are allocated and the angular measuring system meets the accuracy requirement. As a result, the schedule of the angular measuring system can be used in practice. 展开更多
关键词 test turntable angular measuring system dynamic error error model
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Model Refinement for Offshore Platforms: Experimental Study
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作者 ZHANG Min CHEN Zongli WU Yanjian 《Journal of Ocean University of China》 SCIE CAS CSCD 2017年第4期617-626,共10页
Offshore jacket platforms are widely used in offshore oil and gas exploitation.Finite element models of such structures need to have many degrees of freedom(DOFs) to represent the geometrical detail of complex structu... Offshore jacket platforms are widely used in offshore oil and gas exploitation.Finite element models of such structures need to have many degrees of freedom(DOFs) to represent the geometrical detail of complex structures,thereby leading to incompatibility in the number of DOFs of experimental models.To bring them both to the same order while ensuring that the essential eigen-properties of the refined model match those of experimental models,an extended model refinement procedure is presented in this paper.Vibration testing of an offshore jacket platform model is performed to validate the applicability of the proposed approach.A full-order finite element model of the platform is established and then tuned to meet the measured modal properties identified from the acceleration signals.Both model reduction and modal expansion methods are investigated,as well as various scenarios of sensor arrangements.Upon completion of the refinement,the updated jacket platform model matches the natural frequencies of the measured model well. 展开更多
关键词 jacket platform model refinement model updating model reduction modal expansion finite element method
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Energy Bounds for Static Spherically Symmetric Spacetime in f(R, G) Gravity
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作者 M.Farasat Shamir Ayesha Komal 《Communications in Theoretical Physics》 SCIE CAS CSCD 2018年第8期190-196,共7页
The main purpose of this paper is to investigate energy bounds in the context of f(R, G) gravity. To meet this aim, we choose static spherically symmetric spacetime in f(R, G) gravity to develop the field equations. W... The main purpose of this paper is to investigate energy bounds in the context of f(R, G) gravity. To meet this aim, we choose static spherically symmetric spacetime in f(R, G) gravity to develop the field equations. We select three different models of f(R, G) gravity, which are thoroughly discussed in the literature. Firstly, the inequalities are formulated using energy bounds and then viability of the considered models are checked respectively. Graphical analysis show that specific f(R, G) gravity models are satisfied under suitable values of model parameters. It is shown that in a certain case energy bounds are satisfied expect SEC, which supports the late time acceleration expansion of unverse. 展开更多
关键词 energy bounds f(R G) gravity
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