LNG接收站用超低温轴流式止回阀密封问题探讨  

Discussion on Technical Problems About the Sealing of Cryogenic Axial Check Valve used for the LNG Receiving Station

作　　者：陈锦标 张清双 王楠楠 游云峰 曹铖淏 梁常香 董炜杰 李肃 孔令涛 CHEN Jin-biao;ZHANG Qing-shuang;WANG Nan-nan;YOU Yun-feng;CAO Cheng-hao;LIANG Chang-xiang;DONG Wei-jie;LI Su;KONG Ling-tao(Beijing Valve General Factory Co.,Ltd.,Beijing 102600,China;Zhonghong Valve Co.,Ltd.,Handan 056700,Hebei,China;China Huanqiu Contracting&Engineering(Beijing)Co.,Ltd.,Beijing 100012,China;Zhejiang Yongyuan Valve Co.,Ltd.,Yongkang 321300,Zhejiang,China)

机构地区：[1]北京市阀门总厂股份有限公司,北京102600 [2]中鸿阀门股份有限公司,河北邯郸056700 [3]中国寰球工程有限公司北京分公司,北京100012 [4]浙江永园阀门有限公司,浙江永康321300

出　　处：《阀门》2023年第4期484-490,共7页VALVE MAGAZINE

摘　　要：超低温轴流式止回阀作为LNG接收站高压泵出口高压输出总管的部件,其安全可靠运行是保证高压泵正常工作的关键因素。目前LNG接收站用超低温轴流式止回阀很大程度上依赖进口,为降低成本和提高国产化水平,超低温轴流式止回阀国产化势在必行。针对超低温轴流式止回阀国产化样机性能试验和疲劳寿命试验过程中出现的问题,结合该阀的结构及密封机理,基于FMEA对超低温轴流式止回阀的内漏进行了分析并提出改进方案,根据改进方案制造的样机,各项性能试验达到国产化试验大纲要求。同时针对低温轴流式止回阀国产化试验大纲常温密封试验的验收指标存在的问题进行了分析和探讨,并根据常温和低温密封试验泄漏率的系数确定了合理的常温密封试验验收指标。按改进的常温密封试验指标验收合格的阀门进行低温密封试验时,其泄漏率满足国产化试验大纲低温密封试验要求。Cryogenic axial check valve,part of the outlet of the high pressure main on the high-pressure pump for the LNG terminal,is the key part for the safe operation of the high pressure pump.Hence,the related axial check valve for this working condition is almost imported overseas until now.To reduce the cost and boost the related localization,we should produce the cryogenic axial check valve all by ourselves instantly.In view of the problems occurring during the performance test of the localized prototype of the cryogenic axial check valve and the related fatigue life test,associated with its structure and sealing mechanism,we analyze the sealing leakage of the prototype and propose the improvement based on FEMA.On the basic of the improvement above,the prototype was able to fulfill the requirement in the outline for localization test.Meanwhile,we also have analyzed and discussed the acceptance standard of the atmospheric temperature sealing test in this outline,and determined a reasonable acceptance standard based on the coefficient of the leakage for sealing test under atmospheric and low temperatures.When experiment at low temperatures with the valve that accepted by the improved acceptance standard,the leakage is accepted by the low temperature sealing test in the outline for localization test.

关 键 词：LNG接收站 超低温轴流式止回阀 预紧力低温补偿计算 三开环刚性结构 防转结构 密封试验 

分 类 号：TH134[机械工程—机械制造及自动化]