抽凝式汽轮机蒸汽系统波动分析与处理  

Analysis and Solution of Steam Fluctuation in Extraction Condensing Turbine

作　　者：梁顺生 Liang Shunsheng(Sinopec Zhenhai Refining & Chemical Company,Ningbo Zhejiang 315200,China)

机构地区：[1]中国石化镇海炼化分公司

出　　处：《石油石化绿色低碳》2019年第3期47-50,共4页Green Petroleum & Petrochemicals

摘　　要：某乙烯装置抽汽凝汽式汽轮机蒸汽系统在未做调整的情况下出现不定期大幅波动现象。蒸汽系统波动时,压缩机负荷变化较大,调整不及时压缩机会出现喘振,甚至停车,该问题的存在严重影响装置长周期安全运行。通过分析,排除润滑油、控制系统、工艺系统故障,发现真正原因为抽汽阀设计缺陷造成的阀芯磨损。通过计算抽汽阀阀芯前后压差,分析阀芯受力情况,找出抽汽阀阀芯磨损原因,通过增加导向槽、防转销的手段,有针对性的对阀芯进行改造,在不改变阀门特性的情况下,消除了阀芯在前后压差不平衡时的相对转动磨损,从根本上解决了问题。改造后蒸汽系统运行正常,进汽量、抽汽量接近设计值,整个蒸汽系统抗干扰能力增强,为同类抽凝式汽轮机蒸汽系统波动分析提供借鉴。The steam system of the extraction condensing steam turbine in an ethylene plant fluctuated sharply and irregularly when without adjustment, which caused the compressor severe load changes, surge or even shutdown if it was not adjusted timely, leading to serious impact on long-period operation. Data and phenomenon analysis has ruled out the faults in the lubricating oil, control and process systems, but identified the design defect in extraction valve as the real reason. By calculating the pressure difference between the front and the rear of the extraction valve core, and analyzing the stress of the valve core, the reasons of the valve core wear were found out, and the valve core was modified accordingly by adding guide groove and anti-rotating pin, which eliminated relative rotation wear of the valve core caused by the pressure difference between the front and the rear of valve core, with the problem of valve core wear solved while the performance of the valve remaining intact. After the modification, the steam system has been running well, with intake and extraction flows close to design values and anti-interference ability enhanced. All these could provide reference for the analysis of steam system fluctuations in similar extraction condensing steam turbines.

关 键 词：汽轮机 抽汽阀 蒸汽波动 

分 类 号：TQ221.211[化学工程—有机化工]