汽轮机驱动氨压缩机失速分析及对策
Analysis on Rotational Speed Out of Control for Steam Turbine Driven Ammonia Compressor and Its Countermeasure
浏览(2467) 下载(5)
- 引用格式:
-
张锡德,陈小龙,康军,胡渔,米尔扎提.汽轮机驱动氨压缩机失速分析及对策[J].天然气与石油,2019,37(5):0.doi:
Zhang Xide,Chen Xiaolong, Kang Jun, Hu Yu, Mierzati.Analysis on Rotational Speed Out of Control for Steam Turbine Driven Ammonia Compressor and Its Countermeasure[J].Natural Gas and Oil,2019,37(5):0.doi:
- DOI:
- 作者:
- 张锡德1 陈小龙1 康 军2 胡 渔1 米尔扎提1
Zhang Xide1，Chen Xiaolong1, Kang Jun2, Hu Yu1， Mierzati1
- 作者单位:
- 1. 中国石油天然气股份有限公司塔里木石化分公司,2. 中国石油天然气股份有限公司塔西南勘探开发公司
China Petroleum Tarim Petrochemical Company, Korla, Xinjiang, 841000, China 2. Southwest Tarim Exploration and Development Company, Kashgar, Xinjiang, 84400, China
- 关键词:
- 汽轮机;转速;波动;电液转换器;工作异常
Steam turbine; Speed; Fluctuation; Electro-hydraulic converter; Abnormal operation
- 摘要:
某工程汽轮机驱动氨压缩机出现大幅度转速波动,导致高、中蒸汽压力波动,调速状况进一步恶化,造成汽轮机转速失控而触发超速连锁,因速关阀未能打闸,汽轮机超速至14 000 r/min以上。分析事故原因可知,错油门油颗粒只能造成调速阀开度减小,不会造成汽轮机转速上下波动,因此排除了高、中压蒸汽管网压力及压缩机负荷波动、错油门油颗粒等因素对汽轮机转速的影响。对调速系统现场刻度记录进行分析,确认电液转换器工作异常导致了事故发生。对电液转换器进行测试及拆检,发现电液转换器内部润滑油油泥堵塞过滤网是引起电液转换器工作失常的根本原因,同时确认速关阀处于死点位置造成了速关阀无法及时打闸而引起汽轮机严重超速。调整调速系统P\\I值、设定目标转速跟踪实际转速可减少汽轮机转速波动频次及幅值。更换电液转换器、对调速系统进行静态调试使故障消除,并在电液转换器前增设双联过滤器,由此提高调速系统运行稳定性。
The drastic speed fluctuation of ammonia compressor driven by a steam turbine in a certain project results in the fluctuation of high and medium steam pressure and the deterioration of speed regulation, which leads to the runaway speed of the steam turbine and triggers the over-speed interlock.The over-speed of the steam turbine exceeds 14 000 r/min due to the failure of quick-closing valve.By analyzing the causes, it can be seen that the pilot oil valve particles can only cause the reduction of the speed regulating valveopening instead of the speed fluctuation of the steam turbine.Therefore, the influence of high and medium pressure steam pipe network pressure, load fluctuation of the compressor and pilot oil valve particles on the speed of the steam turbine is excluded.The on-site calibration records of the speed control system are analyzed to confirm that the abnormal operation of the electro-hydraulic converter results in the accident.The test and disassembly of the electro-hydraulic converter show that the blockage of filter screen caused by lubricating oil sludge inside the converter is the fundamental reason for the abnormal operation of the electro-hydraulic converter.At the same time, it is confirmed that the dead-point position of the quick-closing valve causes the serious overspeed resulted from the failure of the quick-closing valve.Adjusting the P\I value of the speed regulating system and tracking the actual speed with the target speed can reduce the frequency and amplitude of the speed fluctuation of the steam turbine.The replacement of the electro-hydraulic converter and the static debugging of the speed control system can eliminate the faults, and a duplex strainer is provided before the electro-hydraulic converter to improve the stability of the speed control system.
