Abstract
Multivariable coupling, nonlinear and large time delays exist in the coil outlet temperature (COT) control system of the ethylene cracking furnace, which make it hard to achieve accurate control over the COT of the furnace in actual production. To solve these problems, an inverse controller based on an interval type-2 fuzzy model control strategy is introduced. In this paper, the proposed control scheme is divided into two parts: one is the approach structure part of the interval type-2 fuzzy model (IT2-FM), which is utilized to approach the process output. The other is the interval type-2 fuzzy model inverse controller (IT2-FMIC) part, which is utilized to control the output process to achieve the target value. In addition, on the cyber-physical system platform, the actual industrial data are used to test and obtain the mathematical model of the COT control system of the ethylene cracking furnace. Finally, the proposed inverse controller based on the IT2-FM control scheme has been implemented on the COT control system of the ethylene cracking furnace, and the simulation results show that the proposed method is feasible.
Highlights
As an important and common raw material in the petrochemical industry, ethylene has a peculiar position in the development of the economy and society
In order to make a fair comparison between the T1-FMIC scheme and the Illustration type-2 (IT2)-FMIC scheme, performance indexesare areconsidered considered as the performance indexes asfollows: follows: (1) Integral of the square error (ISE), which is described as:
This article is focused on IT2-FMIC design and its application in the outlet temperature control system of the ethylene cracking furnace, which is a typical nonlinear object in petrochemical industry
Summary
As an important and common raw material in the petrochemical industry, ethylene has a peculiar position in the development of the economy and society. In [4,17,32,33], some inverse controllers based on a type-2 fuzzy model control design strategy are developed, which have been successfully applied to the pH neutralization process and the spherical tank process. Novel inverse controller design scheme into basedtwo on IT2-fuzzy has been structure part of IT2-FM, which is utilized to approach the complex nonlinear process output by developed. The other part the interval control the output process to achieve the target value by exploiting the advantages of and type-2 fuzzy model inverse controller (IT2-FMIC) design, which is utilized to control the output process thetointernal structure. The performance of system the IT2-FMsystem approach and IT2-FMIC are applied to the COT control proposed approach structures of and IT2-FMIC are compared with the corresponding type-1 of the ethylene cracking furnace.
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