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Anomaly detection in a hyper-compressor in low-density polyethylene manufacturing processes using WPCA-based principal component control limit

Title
Anomaly detection in a hyper-compressor in low-density polyethylene manufacturing processes using WPCA-based principal component control limit
Authors
PARK, BYEONGEONKIM, JI SEONLEE, JEONG KEUNLEE, IN BEUM
Date Issued
Jan-2020
Publisher
KOREAN INSTITUTE CHEMICAL ENGINEERS
Abstract
Low-Density Polyethylene (LDPE) was synthesized from ethylene at high-temperature and pressure condition. Hyper-compressor used to increase pressure up to 3,500 atm should be monitored and controlled delicately or it cannot guarantee stable operation of the process causing process shutdown (SD), which is directly related to product yield and process safety. This paper presents a data-based multivariate statistical monitoring method to detect anomalies in the hyper-compressor of a LDPE manufacturing process with weighted principal component analysis model (WPCA), which can consider both time-varying and time-invariant characteristic of data combining principal component analysis (PCA) and slow feature analysis (SFA). Operation data of the LDPE manufacturing process was gathered hourly for four years. WPCA-based principal component control limit (PCCL) was used as an index to determine anomaly and applied to five emergency shutdown (ESD) cases, respectively. As a result, all the five anomalies were detected by a PCCL, respectively, as a sign of SD. Moreover, it shows a better anomaly detection performance than the monitoring method using T-2 and squared prediction error (SPE) based on PCA, SFA, or WPCA.
Keywords
FAULT-DETECTION
URI
http://oasis.postech.ac.kr/handle/2014.oak/100795
ISSN
0256-1115
Article Type
Article
Citation
KOREAN JOURNAL OF CHEMICAL ENGINEERING, vol. 37, no. 1, page. 11 - 18, 2020-01
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 LEE, IN BEUM
Dept. of Chemical Enginrg
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