A novel strategy of continuous process transition and wide range throughput fluctuating ethylene column

Cao, Xin‐Yi; Xu, Feng; Luo, Xianglong

doi:10.1016/j.jtice.2021.03.052

Cited by 5 publications

(4 citation statements)

References 29 publications

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“…It can be seen from the above analysis that there are two defects in dynamic optimization in the research of the transition strategy of complex systems: it is difficult to Processes 2022, 10, 796 4 of 16 solve by the indirect method and a continuous solution with physical significance cannot be obtained by the direct method. Cao et al [16] presented the frequency domain-based analytical approach (A-FD) to overcome the shortcomings of the dynamic optimization method, which is shown in Figure 1.…”

Section: Continuous Process Transition Strategy With No Different Cha...mentioning

confidence: 99%

“…It can be seen from the above analysis that there are two defects in dynam mization in the research of the transition strategy of complex systems: it is diff solve by the indirect method and a continuous solution with physical significan not be obtained by the direct method. Cao et al [16] presented the frequen main-based analytical approach (A-FD) to overcome the shortcomings of the d optimization method, which is shown in Figure 1. Different from the optimization idea, the A-FD maps the transition problem the time domain to the frequency domain space, and then directly solves the cont transition trajectory of the manipulated variables according to the transfer fu model of the plant in the frequency domain space.…”

Section: Continuous Process Transition Strategy With No Different Cha...mentioning

confidence: 99%

“…The analytical method obtains the corresponding relationship between the manipulated variable and system model by analyzing the essence of the transition problem, and then directly deduces the manipulated variable transition trajectory through the system model, such as Cao et al [16] presented in a frequency domain-based analytical approach. It acquires the continuous transition strategy with physical significance through the transfer function model, which is unable to be addressed in the time domain.…”

Section: Introductionmentioning

confidence: 99%

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Targeting on Different Characteristic Continuous Variables in Process Transition for Ethylene Column with Wide-Range Feed Fluctuation

Cao

Luo

2022

Processes

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For the study of the transition strategies of continuous chemical processes, both continuity and dynamic characteristics in the physical sense are critical. The continuous transition strategy has a higher information density and can describe the real situation as closely as possible. In addition, the accuracy of the dynamic characteristics is necessary because the process transition is the study of the dynamic system processes. However, existing transition strategies have certain shortcomings. Dynamic optimization can obtain transition strategies with different characteristics but no physical meaning and a frequency domain-based analytical approach can acquire a continuous transition strategy with physical meaning, but its dynamic characteristics are the same. Therefore, by integrating the advantages of the existing strategies, a new transition strategy has been presented, which possesses different dynamic characteristics and continuity synchronous with physical significance. When process transition occurs, the proposed strategy results in less fluctuation and can quickly reach and maintain a steady state. Furthermore, the strategy is also suitable for the rapid application of different transition processes in the same plant. The performance of the transition strategies is evaluated through research on a continuous feed ethylene column.

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Section: Continuous Process Transition Strategy With No Different Cha...mentioning

confidence: 99%

Section: Continuous Process Transition Strategy With No Different Cha...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Targeting on Different Characteristic Continuous Variables in Process Transition for Ethylene Column with Wide-Range Feed Fluctuation

Cao

Luo

2022

Processes

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“…14 Because of the effect of discrete accuracy, the numerical solution may ignore some local details, which in turn has adverse impacts on the transition process. The frequencydomain-based analytical method and frequency-domainbased two-step optimization approach developed by Cao et al 15,16 have addressed the above defects. The transition strategy acquired by these two methods has physical continuity, which further enhances the accuracy and practicality of the transition strategy.…”

Section: Introductionmentioning

confidence: 99%

Novel feedforward‐feedback‐based continuous process transition strategy for chemical industry

Cao

Luo

2022

Asia-Pacific J Chem Eng

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As a typical regulation means to realize a large-scale transition of the system condition, the lack of feedback compensation in the transition strategy leads to the fact that it has no moderating effect on interference. In order to ensure the safe and smooth operation of the system, it is necessary to coordinate the transition and control, that is, to achieve the process transition through a closedloop control structure. The existing coordination scheme can meet this demand, but there is a defect of poor anti-interference. To this end, a novel coordination scheme integrating transition with control is proposed in the paper, which alleviates the burden on the feedback control system by adding the manipulated variable reference trajectory. When interferences occur, the proposed coordination scheme can positively respond and compensate for the negative influence of disturbances, allowing the system to quickly return to the desired state. Besides, the corresponding analytical solution method is presented for the new coordination scheme, which avoids the complication of the conventional optimization solution method. Finally, the advantage of our coordination scheme has been effectively verified through the feed fluctuation ethylene column.

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Online control system reconfiguration towards long period energy-saving optimization of heat exchanger networks

Sun

Ren

Luo

2022

Journal of Cleaner Production

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A novel strategy of continuous process transition and wide range throughput fluctuating ethylene column

Cited by 5 publications

References 29 publications

Targeting on Different Characteristic Continuous Variables in Process Transition for Ethylene Column with Wide-Range Feed Fluctuation

Targeting on Different Characteristic Continuous Variables in Process Transition for Ethylene Column with Wide-Range Feed Fluctuation

Novel feedforward‐feedback‐based continuous process transition strategy for chemical industry

Online control system reconfiguration towards long period energy-saving optimization of heat exchanger networks

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