A method and system for boiler MFT key cause analysis and on-site improvement measures

Abstract

The embodiment of the invention provides a boiler main fuel trip (MFT) key cause analyzing and on-site transformation measure method and system. Whether values of the operating electric current and the adjustable vane opening of an induced draught fan are gradually increased along with the time or not before trip is judged, and if yes, the condition that a chimney inlet smoke gas baffle plate door is abnormal is determined; and after the condition that the baffle plate door is abnormal is determined, the electric current value of the induced draught fan before trip and the electric current value when the chimney inlet smoke gas baffle plate door is opened again after trip are detected, whether the electric current value of the induced draught fan before trip is larger than the electric current value when the chimney inlet smoke gas baffle plate door is opened again after trip or not is judged, if yes, it is determined that the reason why boiler MFT is caused is that the chimney inlet smoke gas baffle plate door is not opened, and a first corresponding signal is generated and transmitted to a DCS, so that the technical problem that when the chimney inlet smoke gas baffle plate door is abnormal, the DCS cannot conduct detection, and thus the correct reason for boiler MFT cannot be obtained is solved.

Description

technical field [0001] The invention relates to the field of boiler inspection and maintenance, in particular to a method and system for analyzing key causes of boiler MFT and on-site reform measures. Background technique [0002] With the continuous development of economy and society, better requirements have been put forward for the safe and stable operation of thermal power generation. How to ensure the safe and stable operation of electronic boilers and reduce boiler shutdown accidents caused by human factors is a key technical problem facing all thermal power plant technicians. The boiler MFT (Main Fuel Trip) event brings a great hidden danger to the safe operation of the power plant and even the power grid. [0003] For example, on January 12, 2017, at 13:53:26 in Unit 1 of a power plant, the two induced draft fans of the boiler issued a surge alarm at the same time, and the negative pressure in the furnace became positive and increased significantly. At 53:32, the fu...

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a method and system for boiler MFT key cause analysis and on-site improvement measures, which are used to solve the problem that the DCS system cannot detect the abnormality of the flue gas baffle door at the chimney inlet, resulting in the inability to obtain the correct reason for the boiler MFT technical problem

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