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프로세스 압축기 틸팅패드 저널베어링의 비정상고온거동 트러블슈팅

Title
프로세스 압축기 틸팅패드 저널베어링의 비정상고온거동 트러블슈팅
Other Titles
Abnormal High-Temperature Behavior Troubleshooting of Process Compressor Tilting Pad Journal Bearing
Author
최동훈
Keywords
프로세스 압축기; 틸팅패드 저널베어링; 비정상 고온; 트러블슈팅; 설계 접근; process compressor; tilting pad journal bearing; abnormal high-temperature; troubleshooting; design approach
Issue Date
2017-04
Publisher
한국윤활학회
Citation
한국윤활학회지, v. 33, no. 2, page. 37-44
Abstract
A DE-side LBP tilting pad journal bearing of a 1-stage overhung heat-pump compressor in a propylene process exhibited abnormal high-temperature behavior. Its temperature had been relatively high at 78 °C from the beginning of operation. In 2014, after three years of operation, it increased suddenly and reached 103 °C. Installing a varnish removal equipment and others managed to stabilize the temperature at 95 °C. We undertook a troubleshooting approach for reviewing the comprehensive status and integrity of the temperature design of the bearing. We performed lubrication and heat-balance analysis, based on the design engineering data and documents supplied by the OEM. For the base design data of DE-side TPJB, evaluating the effects of key design variables on bearing metal temperature showed that firstly, increasing the bearing clearance and supply oil flow-rate, and next, changing the oil type, and finally, increasing the machined pad clearance and offset, are more effective in reducing the bearing metal temperature. Furthermore, a clarification meeting with the OEM revealed that an incorrect decision had been made to decrease the bearing clearance to eliminate the SSV harshness issue, while not maintaining a sufficient oil flow-rate. We conducted a detailed retrofit design analysis, wherein we increased the oil flow-rate and bearing clearance by decreasing the preload. We predicted that the bearing temperature would decrease to 63 °C from 75.7 °C even at the rerate condition. Finally, after installing and operating a retrofit replacement bearing in 2015, the bearing temperature stabilized at a low temperature of 65 °C. Currently (January. 2017), two year later, the bearing metal temperature remains at 65 °C. Therefore, we can conclude that the abnormal high-temperature behavior of the bearing has been resolved completely.
URI
http://koreascience.or.kr/article/JAKO201717447647378.pagehttps://repository.hanyang.ac.kr/handle/20.500.11754/113781
ISSN
1229-4845; 2287-4666
DOI
10.9725/kstle.2017.33.2.37
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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프로세스 압축기 틸팅패드 저널베어링의 비정상고온거동 트러블슈팅.pdfDownload
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