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| Influence law of erosion wear of blowdown valve based on CFD numerical simulation |
| ZHONG Lin1,2,FENG Guihong1,ZHANG Jichun1,WEI Gang1 |
| 1. College of Mechanical and Electrical Engineering, Southwest Petroleum University, Energy Equipment Research Institute, Southwest Petroleum University, Chengdu, Sichuan 610500, China; 2. Zhanjiang Branch of South Marine Science and Engineering Laboratory of Guangdong Province, Zhanjiang, Guangdong 524000, China |
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Abstract The puncture phenomenon of the sewage valve of the main equipment of the sewage system of the gas transmission station has occurred in use, resulting in a safety accident of natural gas leakage. The CFD simulation method was used to evaluate the erosion wear performance of the sleeve-type blowdown valve by factors such as fluid flow rate, particle size, sand-containing volume ratio, and valve opening. The results show that the erosion damage between the valve core and the seat sealing contact wall surface is the main reason for the failure of the entire drain valve. When the flow rate is 1~9 m/s, the particle size is 0.1~0.5 mm, the sand-containing volume ratio is 2%~10%, and the valve opening range is 15%~90%, the erosion wear rate is positively correlated with the fluid flow rate. The erosion wear area significantly increased with flow velocity increasing. Increased sand concentration increases the frequency of particles hitting the valve cavity wall surface, and the erosion rate increases approximately linearly. The change of particle size has little effect on the average erosion wear rate of the sewage valve. The erosion damage caused by the erosion behavior of small particles is more uniform than that of large particles. During the opening of the blowdown valve in the range of 15% to 30%, the degree of erosion wear of the valve changes drastically. From 60% of the opening, the da-mage of the valve tends to be stable. At the same time, in the process of increasing the valve opening, the maximum erosion wear area of the valve core gradually movs from the circumferential wall surface to the lower end surface of the valve core. This study provides some guidance for the overall erosion resis-tance evaluation of blowdown valves.
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Received: 07 February 2020
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