TY - JOUR
T1 - Optimization of Multilayer Standby Mechanisms in Continuous Processes under Varying Loads
AU - Chan, Sing Zhi
AU - Chang, Chuei Tin
N1 - Funding Information:
This work is supported by the ministry of science and technology of the Taiwan government under grant 108-2221-E-006-149-.
Funding Information:
This work is supported by the ministry of science and technology of the Taiwan government under grant 108-2221-E-006-149-.
Publisher Copyright:
© 2020 Institution of Chemical Engineers
PY - 2021/2
Y1 - 2021/2
N2 - In modern chemical plants, there is a class of continuous processes operated under varying loads. In these processes, the standby mechanisms are needed to ensure that the downstream demand is always satisfied during the operations. Although a few related studies have been reported in literature, a comprehensive analysis of multilayer standby mechanisms in processes under varying loads has not been carried out. In this paper, a generalized mathematical model is developed to automatically generate the optimal standby mechanisms for any given processes by minimizing the total expected lifecycle expenditure. A Matlab code has been developed to perform these optimization tasks via genetic algorithm. The feasibility and effectiveness of the proposed model are demonstrated with the case study concerning a fan system for providing instrument air in a typical chemical plant. From the optimization results, one can determine the optimum configurations of the standby mechanisms, which include: (1) the number of protection layers, (2) the number of both online and spare sensors in the measurement channels, (3) the corresponding voting-gate logic in each channel, (4) the inspection intervals of switch and (5) the number of spares for switch.
AB - In modern chemical plants, there is a class of continuous processes operated under varying loads. In these processes, the standby mechanisms are needed to ensure that the downstream demand is always satisfied during the operations. Although a few related studies have been reported in literature, a comprehensive analysis of multilayer standby mechanisms in processes under varying loads has not been carried out. In this paper, a generalized mathematical model is developed to automatically generate the optimal standby mechanisms for any given processes by minimizing the total expected lifecycle expenditure. A Matlab code has been developed to perform these optimization tasks via genetic algorithm. The feasibility and effectiveness of the proposed model are demonstrated with the case study concerning a fan system for providing instrument air in a typical chemical plant. From the optimization results, one can determine the optimum configurations of the standby mechanisms, which include: (1) the number of protection layers, (2) the number of both online and spare sensors in the measurement channels, (3) the corresponding voting-gate logic in each channel, (4) the inspection intervals of switch and (5) the number of spares for switch.
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U2 - 10.1016/j.cherd.2020.11.026
DO - 10.1016/j.cherd.2020.11.026
M3 - Article
AN - SCOPUS:85098722818
SN - 0263-8762
VL - 166
SP - 86
EP - 96
JO - Chemical Engineering Research and Design
JF - Chemical Engineering Research and Design
ER -