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| Fault Diagnosis for Natural Gas Dehydration Device Based on the Combination of PCA and SDG |
| Received:April 16, 2021 Revised:June 04, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2021.09.016 |
| KeyWord:dehydration device fault diagnosis PCA SDG |
| Author | Institution |
| XIONG Wei |
Chongqing Gas Mine of Southwest Oil and Gas Branch, PCL Chongqing , China |
| MA Hao |
School of Mechanical Engineering, Chongqing University, Chongqing , China |
| ZHANG Bo |
Chongqing Gas Mine of Southwest Oil and Gas Branch, PCL Chongqing , China |
| LONG Yan-li |
Chongqing Gas Mine of Southwest Oil and Gas Branch, PCL Chongqing , China |
| YIN Ai-jun |
School of Mechanical Engineering, Chongqing University, Chongqing , China |
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| Abstract: |
| The paper aims to quickly locate the fault source of the natural gas dehydration device. Principal component analysis was performed on the monitoring parameters that reflected the running state of the dehydration system so as to identify the abnormal parameters. Combined with the dehydration process flow chart, the causal analysis of all parameters and potential fault sources was carried out to establish the overall SDG model of the dehydration device. The symbols of each abnormal parameter were substituted into the model, and the equipment faults that caused these parameters were determined according to the two-way reasoning rule. The SPE and T2 statistics constructed by principal component analysis remained within the control limits of 20 and 141 during normal operation of the device, and both increased sharply at the same time when a fault occurred, and then fluctuated in a range well above the control limit. The main fault parameters identified by the contribution diagram method were TEG circulation, reboiler temperature and buffer tank level. The combination of PCA and SDG can integrate the advantages of the two methods, improve the efficiency of petrochemical equipment inspection and maintenance, and ensure the reliable operation of the equipment. |
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