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| Experimental study on inner flow field of RCP shaft seal based on phase image edge online detection |
| CHEN Kan1*, GUO Yi2, LIU Wei1, ZHANG Junkai1, REN Hebin1 |
| 1. Sinoseal Holding Co., Ltd, Chengdu, Sichuan 610045, China; 2. China Nuclear Power Operation and Management Corporation, Jiaxing, Zhejiang 314000, China |
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Abstract Abstract:In order to study the abnormal working condition of the reactor coolant pump hydrodynamic pressure shaft seal and verify the working conditions of the third stage secondary seal, a simulation analysis of the shaft temperature distribution of the syatem was carried out. The three-stage low pressure leakage flow phase state images were obtained online by using a micro endoscopic device, and a digital images process method was applied. The mean square error value was obtained by using the Sobel edge detection algorithm. The online monitoring of the phase state of the low pressure leakage flow of the RCP shaft seal was realized based on the endoscopic image. The lubrication state of the dynamic seal was improved by increasing the third-stage leakage back pressure, and the multi-level back pressure validation tests were carried out. The characteristic value obtained by Sobel edge detection algorithm for flow field image is used to evaluate the flow status change of shaft seal leakage flow field. The results show that when the back pressure equivalent water column height are H=0.77 m, 1.30, 1.55, 1.80, and the Sobel mean square error value are δs1s2=0.005 549, δs1s2=0.015 100, δs1s2=0.020 690,δs1s2=0.198 400, respectively. Based on that the above conclusions, a U-shaped pipe with the optimal height was designed, which can improve the low pressure leakage back pressure of the lubrication of the three-stage dynamic O-ring of the three stage seal.
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Received: 09 January 2020
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