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Cascade refrigeration system synthesis based on hybrid simulated annealing and particle swarm optimization algorithm

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Chinese Journal of Chemical Engineering 2023年第6期58卷 244-255页

作者： Danlei Chen Yiqing Luo xigang yuan Chemical Engineering Research Center School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300350China State Key Laboratory of Chemical Engineering Tianjin UniversityTianjin 300350China

Cascade refrigeration system(CRS)can meet a wider range of refrigeration temperature requirements and is more energy efficient than single-refrigerant refrigeration system,making it more widely used in low-temperature industry *** synthesis of a CRS with simultaneous consideration of heat integration between refrigerant and process streams is challenging but promising for significant cost saving and reduction of carbon *** study presented a stochastic optimization method for the synthesis of *** MINLP model was formulated based on the superstructure developed for the CRS,and an optimization framework was proposed,where simulated annealing algorithm was used to evolve the numbers of pressure/temperature levels for all sub-refrigeration systems,and particle swarm optimization algorithm was employed to optimize the continuous *** effectiveness of the proposed methodology was verified by a case study of CRS optimization in an ethylene plant with 21.89%the total annual cost saving.

关键词： Optimal design Process systems Particle swarm optimization Simulated annealing Mathematical modeling

Recent progress on equation-oriented optimization of complex chemical processes

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Chinese Journal of Chemical Engineering 2022年第1期35卷 162-169页

作者： Yuyang Kang Yiqing Luo xigang yuan Chemical Engineering Research Center School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300350China State Key Laboratory of Chemical Engineering Tianjin UniversityTianjin 300350China

Process optimization in equation-oriented(EO)modeling environments favors the gradient-based optimization algorithms by their abilities to provide accurate Jacobian matrices via automatic or symbolic ***,computational inefficiencies including that in initial-point-finding for Newton type methods have significantly limited its ***,progress has been made in using a pseudo-transient(PT)modeling method to address these difficulties,providing a fresh way forward in EO-based ***,research in this area remains open,and challenges need to be ***,understanding the state-of-the-art research on the PT method,its principle,and the strategies in composing effective methodologies using the PT modeling method is necessary for further developing EO-based methods for process *** this purpose,the basic concepts for the PT modeling and the optimization framework based on the PT model are reviewed in this *** typical applications,e.g.,complex distillation processes,cryogenic processes,and optimizations under uncertainty,are presented as ***,we identify several main challenges and give prospects for the development of the PT based optimization methods.

关键词： Simulation Optimization Algorithm Pseudo-transient modeling method Equation-oriented optimization Complex chemical processes

A systematic approach for synthesizing a low-temperature distillation system

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Chinese Journal of Chemical Engineering 2015年第5期23卷 789-795页

作者： Yiqing Luo Liang Kong xigang yuan Chemical Engineering Research Center School of Chemical Engineering and Technology Tianjin University

In this paper, by combining a stochastic optimization method with a refrigeration shaft work targeting method,an approach for the synthesis of a heat integrated complex distillation system in a low-temperature process is presented. The synthesis problem is formulated as a mixed-integer nonlinear programming(MINLP) problem,which is solved by simulated annealing algorithm under a random procedure to explore the optimal operating parameters and the distillation sequence structure. The shaft work targeting method is used to evaluate the minimum energy cost of the corresponding separation system during the optimization without any need for a detailed design for the heat exchanger network(HEN) and the refrigeration system(RS). The method presented in the paper can dramatically reduce the scale and complexity of the problem. A case study of ethylene cold-end separation is used to illustrate the application of the approach. Compared with the original industrial scheme, the result is encouraging.

关键词： Energy System engineering Low-temperature distillation system Process synthesis Distillation sequence Shaft work target

Optimization of biofuel supply chain integrated with petroleum refineries under carbon trade policy

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Frontiers of Chemical Science and Engineering 2024年第3期18卷 113-122页

作者： Wenhui Zhang Yiqing Luo xigang yuan Chemical Engineering Research Center School of Chemical Engineering and TechnologyTianjin UniversityTianjin300350China State Key Laboratory of Chemical Engineering Tianjin UniversityTianjin300350China

The use of fossil fuels results in significant carbon dioxide *** have been increasingly adopted as sustainable alternatives to fossil fuel to address this environmental *** petroleum refineries into biofuel supply chains is an effective approach to mitigating greenhouse gas emissions and improving environmental *** this study,an integrated supply chain optimization framework was established,considering the carbon trade *** addition,a mixed-integer nonlinear programming model was developed to optimize the selection of biomass suppliers,construction of pretreatment plants and biorefineries,integration of petroleum refineries,and selection of transportation routes with the objective of minimizing the total annual *** example is presented to illustrate the applicability of the *** optimization results show that integrating petroleum refineries into biofuel supply chains effectively mitigates carbon *** trade policies can have a direct impact on the total annual cost and carbon emissions of the supply chain.

关键词： renewable energy biofuel supply chain carbon trade policy

Refrigeration system synthesis based on de-redundant model by particle swarm optimization algorithm

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Chinese Journal of Chemical Engineering 2022年第10期50卷 412-422页

作者： Danlei Chen Yiqing Luo xigang yuan School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China State Key Laboratory of Chemical Engineering Tianjin UniversityTianjin 300072China

Simultaneous optimization of refrigeration system(RS)and its heat exchanger network(HEN)leads to a large-scale non-convex mixed-integer non-linear programming(MINLP)***,researchers usually adopted simplifications to confine problem scale from being too large at the cost of reducing solution *** study established an optimization framework for the simultaneous optimization of RS and ***,A more comprehensive and compact model was developed to guarantee a relatively complete solution space while reducing model scale as well as its solving *** this model,a tandem arrangement of connecting sub-coolers and expansion valves was considered in the superstructure;and the pressure/temperature levels were optimized as continuous *** this basis,we proposed a"two-step transformation method"to equivalently transform the cross-level structure into a no n-cross-level structu re,and the de-redundant superstructu re was established with ensuring comprehensiveness and ***,the MINLP model was developed and solved by Particle Swarm Optimization ***,our methodology was validated to get better optimal results with less CPU time in two case studies,an ethylene RS in an existing plant and a reported propylene RS.

关键词： Refrigeration system Optimal design Process systems Particle swarmoptimization Mathematical modeling

A formulation methodology for multicomponent distillation sequences based on stochastic optimization

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Chinese Journal of Chemical Engineering 2016年第9期24卷 1229-1235页

作者： Fei Wang Yiqing Luo xigang yuan Chemical Engineering Research Center School of Chemical Engineering and Technology Tianjin University State Key Laboratory of Chemical Engineering Tianjin University

Based on stochastic optimization strategy, a formulation methodology is proposed for synthesizing distillation column sequences, allowing more than one middle component as the distributing components between a pair of key components in the non-sharp split. In order to represent and manipulate the distillation configuration structures, a new coding procedure is proposed in the form of one-dimensional array. Theoretically, an array can represent any kind of split(non-sharp and sharp). With the application of a binary sort tree approach, a robust flow sheet encoding and decoding procedure is developed so that the problem formulation and solution becomes tractable. In this paper,the synthesis problem is formulated as a mixed-integer nonlinear programming(MINLP) problem and an improved simulated annealing approach is adopted to solve the optimization problem. Besides, a shortcut method is applied to the evaluation of all required design parameters as well as the total function.

关键词： Distillation sequences synthesis Non-sharp separation Simulated annealing MINLP Binary sort tree

Making More Sense of Human Intention Detection via Reconstruction Models

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China Communications 2020年第7期17卷 193-206页

作者： Wei Liang Dalin Zhang xigang yuan School of Computer Science and Engineering Changshu Institute of TechnologyChangshu 215500China School of Computer Science and Engineering University of New South Wales2052 NSWAustralia Business School Jiangsu Normal UniversityXuzhou 221116China

Movement intention recognition paves the path to developing Brain-Computer Interface(BCI)*** research mostly focuses on questions like"which hand is intended to move".While answering questions like"whether a hand is intended to move"is more desirable for widely realworld applications,because we cannot continuously perform intention tasks during usage,and the gap periods may cause unintended operation resulting in system ***,this kind of intention detection task is more difficult,since for a"whether"problem,it is hard to know what the"not"situation is and consequently to acquire training samples for the"not"***,the occurrence of genuine intentions is comparatively scarce and unexpected,making the intention detection task hard and *** tackle this problem,we propose a Reconstruction-based Intention Detection(RID)framework,which utilises a reconstruction model to represent a high-level abstraction of EEG signals and leverages the reconstruction errors to determine"whether"there is a movement *** framework is not only theoretically flexible and robust to any sophisticated real-world scenarios but also hand-crafted feature and domain knowledge *** experiments on detecting movement intention tasks with different reconstruction models demonstrate the promising performance of the proposed reconstruction intention detection framework.

关键词： intention consuming mostly

Festschrift in honor of Professor ***(Guocong Yu)and the 40th anniversary of the CJChE

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Chinese Journal of Chemical Engineering 2022年第10期50卷 1-2页

作者： xigang yuan Zhibing Zhang Guangjin Chen Tianjin University China Nanjing University China China University of Petroleum(Beijing) China

We are honored to present this special issue of the Chinese Journal of Chemical Engineering(CJChE)as a Festschrift in honor of Professor ***(1922.11–2022.4)to commemorate the 100th anniversary of his birth,and celebr... 详细信息

关键词： anniversary honor K

Optimal synthesis of compression refrigeration system using a novel MINLP approach

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Chinese Journal of Chemical Engineering 2018年第8期26卷 1662-1669页

作者： Tao Yang Yiqing Luo Yingjie Ma xigang yuan School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China State Key Laboratory of Chemical Engineering Tianjin University Tianjin 300072China

The optimal design of a compression refrigeration system(CRS) with multiple temperature levels is very important to chemical process industries and also represents considerable challenges in process systems engineering. In this paper, a general methodology for the optimal synthesis of the CRS, which simultaneously integrates CRS and Heat Exchanger Networks(HEN) to minimize the total compressor shaft work consumption based on an MINLP model, has been proposed. The major contribution of this method is in addressing the optimal design of refrigeration cycle with variable refrigeration temperature levels. The method can be used to make major decisions in the CRS design, such as the number of levels, temperature levels, and heat transfer duties. The performance of the developed methodology has been illustrated with a case study of an ethylene CRS in an industrial ethylene plant, and the optimal solution has been examined by rigorous simulations in Aspen Plus to verify its feasibility and consistency.

关键词： Optimal design Compression refrigeration system (CRS) Chemical process Process systems Compressor shaft work Mixed Integer Nonlinear Programming (MINLP)