空气预热器跳闸引发锅炉MFT动作的原因分析及处理

华电技术 ›› 2010, Vol. 32 ›› Issue (10): 6-7.

空气预热器跳闸引发锅炉MFT动作的原因分析及处理

马士东

安徽华电宿州发电有限公司，安徽宿州234101

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2010-10-25 发布日期:2010-10-25

Reason of boiler MFT tripping caused by air preheater tripping and treatment measures

MA Shidong

Anhui Huadian Suzhou Power Generation Corporation Limited, Suzhou 234101, China

Received:1900-01-01 Revised:1900-01-01 Online:2010-10-25 Published:2010-10-25

摘要/Abstract

摘要： 某电厂600MW 超临界机组在商业运行中，由于2台空气预热器同时跳闸，导致锅炉MFT动作。其主要原因是接在锅炉MCC 2段上的渣仓皮带机电动机接地，控制该电动机的变频器未能有效切除故障，导致锅炉MCC 2段电压异常，空气预热器齿轮油泵同时切掉并联跳空气预热器。对接线运行方式进行了整改并增加了备用齿轮油泵，对齿轮油泵跳闸联跳预热器逻辑和定值进行了修改，有效避免了因辅助设备接线及运行方式欠妥而导致主机跳机的事故发生。
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关键词: 空气预热器, 跳闸, 齿轮油泵, 处理

Abstract: In operation of a 600MW supercritical unit of a power plant, the two air preheaters were tripped simultaneously, and this caused the boiler MFT (main fuel tripping) tripped. The main reason is that the motor of belt conveyor of slag bin, which was connected into boiler MCC #2 section, was earthed; and the converter, which controls the motor, had not switched off the fault devices, and this had caused the voltage of boiler MCC #2 section was abnormal; the gear oil pumps of air preheater were tripped, then the main motors of air preheater were tripped though interlock circuit. The power source connection mode and power operation mode were corrected; a spare gear oil pump was added; and the gear oil pump and air preheater intertrip logic and settings were modified. Then the accident of main machine tripping, which should be caused by improper connection and operation of auxiliary equipments, can be avoided.
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Key words: air preheater, trip, gear oil pump, treatment

马士东. 空气预热器跳闸引发锅炉MFT动作的原因分析及处理[J]. 华电技术, 2010, 32(10): 6-7.

MA Shidong. Reason of boiler MFT tripping caused by air preheater tripping and treatment measures[J]. Huadian Technology, 2010, 32(10): 6-7.

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