LNG离心泵故障原因分析及其解决方案
Failure analysis of LNG centrifugal pump and its solutions
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- 引用格式:
-
白宇恒,邓东风,张啟超,马少峰,刘主宸.LNG离心泵故障原因分析及其解决方案[J].天然气与石油,2022,40(2):1-6.doi:10.3969/j.issn.1006-5539.2022.02.001
BAI Yuheng, DENG Dongfeng, ZHANG Qichao, MA Shaofeng, LIU Zhuchen.Failure analysis of LNG centrifugal pump and its solutions[J].Natural Gas and Oil,2022,40(2):1-6.doi:10.3969/j.issn.1006-5539.2022.02.001
- DOI:
- 10.3969/j.issn.1006-5539.2022.02.001
- 作者:
- 白宇恒1 邓东风2 张啟超3 马少峰1 刘主宸4
BAI Yuheng1, DENG Dongfeng2, ZHANG Qichao3, MA Shaofeng1, LIU Zhuchen4
- 作者单位:
- 1. 中国石油工程建设有限公司西南分公司, 四川 成都 610041; 2. 中国石油工程建设有限公司, 北京 100120; 3. 中国石油西南油气田公司输气管理处, 重庆 102649; 4. 中国石油天然气股份有限公司规划总院, 北京 100083
1. CPECC Southwest Company, Chengdu, Sichuan, 610041, China; 2. China Petroleum Engineering & Construction Corporation, Beijing, 100120, China; 3. Gas Transmission Management Office, PetroChina Southwest Oil & Gasfield Company, Chongqing, 102649, China; 4. PetroChina Planning & Engineering Institute, Beijing, 100083, China
- 关键词:
- LNG离心泵;汽蚀分析;整改方案
LNG centrifugal pump; Cavitation analysis; Rectification plan
- 摘要:
- 针对某LNG工厂LNG离心泵预冷、启动困难且运行异常等故障,通过现场观察、数据采集、理论分析计算等方法详细分析了上述故障的原因。分析结果表明：LNG离心泵预冷流程阻力大;泵前管路存在气阻;泵存在汽蚀是导致LNG离心泵运行异常的主要原因。根据分析结果,结合现场实际情况提出了整改方案,整改后LNG离心泵运行情况明显好转。经过研究得出建议：LNG离心泵工艺设计时，工艺流程及管道布置设计应尽量减小预冷系统管路阻力;LNG离心泵汽蚀余量计算时必须考虑介质温度的变化;泵前管路应避免形成“气袋”。
In one LNG liquefaction plant, the difficulties in pre-cooling and starting LNG centrifugal pump, and abnormal operation were analyzed by means of on-site observation, data collection and theoretical analysis and calculation. The results show that there are high flow resistance in the pump pre-cooling process system; vapour lock in the piping in front of the pump; and the pump cavitation is the main reason for abnormal operation. According to the analysis results, the rectification plan is given in accordance with the field situation. The operation of LNG centrifugal pump is obviously improved after the rectification. Finally, it is suggested that the process flow and piping layout of LNG centrifugal pump be designed to reduce the piping resistance of the pre-cooling system and the change of medium temperature be considered in the calculation of the cavitation allowance of LNG centrifugal pump. The pipeline before the pump should avoid the formation of “air pockets”.
