第45卷第3期 2016年5月
文章编号：1000-7466(2016)03-0092-05
油化
设
PETRO-CHEMICAL EQUIPMENT
Vol. 45 No. 3
May 2016
高工况条件下双端面机械密封失效分析及改造
闫宝秋，张兵，文明基，戴金辉
611930)
(四川石化有限责任公司生产六部，四川彭州
摘要：高工况条件下双端面机械密对失效原因复杂，必须通过对密封设备及其例服系统进行针对性改造和一些材质的调整才能找到合适的改造方案，通过对在四川石化有限责任公司反应器循环系上运行的美国进口高工况机械密对失效现象的分析，成功实施了机械密对和辅助系统的国产化改造。结果表明，以机械密对及其辅助冲洗系统为整体研究对象有助于准确分析机械密封失效原
因，为机械密对成功改造提供了保障，也为类似工况条件下的机械密对选型和维护提供了参考，关键词：双端面机密封；环泵；失效分析；改造
中图分类号：TQ051.203;TE964.03;TB42文献标志码：Bdoi:10.3969/j.issn.1000-7466.2016.03.021
Failure Analysis of the Dual Mechanical Seal under Heavy Working Duties and Its Transformation YAN Bao-qiu, ZHANG Bing, WEN Ming-ji, DAI Jin-hui
(Production Dept. VI, CNPC Sichuan Petrochemical Co. Ltd., Pengzhou 611930, China)
Abstract: In view of the current circumstance that the failure reason of dual-mechanical seal is complex and it is difficult to find out the proper solutions to solve this problem,tracking and ana-lysing the failure reason of the dual mechanical seal imported from US that operated on the reac-tor circulation pump in the site of Sichuan Petrochemical Co. Ltd. is kept until the mechanical seal and flushing system are successfully retrofitted by domestic transformation. The result shows that it is helpful to find the root failure reason of the mechanical seals accurately when tak ing the mechanical seal and its flushing system as a whole analysis object and guarantee the suc cessful refurbishment of the seals as well as provide the reference for the equipment engineer to
deal with the mechanical seal selection and maintenance under similar operation conditions. Key words: dual mechanical seal; circulation pump; failure analysis; transformation
随着科技的进步及炼化行业的发展，对机械密封的稳定性运行要求也越来越高]。单端面机械密封只能满足大部分离心泵一般工况下的安全运行要求，但很难满足高工况，例如高温（120C以上）、高压（2.0MPa以上）、高转速（1400r/min以上）、高线速度(15m/s以上)及高危险性介质（有毒、易燃、易爆、易挥发、易结焦等特点）输送环境下稳定、可靠、安全的运行要求。双端面机械密封是高工况条件，尤其极端工况下的首选密封形式3。在特殊工
收稿日期：2015-12-10
况条件下，必须设计特殊的机械密封结构配合使用合理的冲洗方案才能保证其长周期安全运行。
四川石化有限责任公司丁宰醇装置辨基合成反应器循环泵（位号280-P-1101AB）为Sulzer CD14X16X22D双支撑泵，采用API的Plan53B冲洗系统，风冷换热，泵人口压力2.07～2.45MPa，泵出口压力2.47~2.85MPa，温度31～120C，转速为1980r/min，介质为丁醇及催化剂)。在开车期间，该泵多次出现密封失效，表现为大气侧密封泄
作者简介：间宝秋（1963-)，男，河北肃宁人，工程师，学士，从事设备维修管理工作。