Online monitoring method for operation state of large-sized variable-speed water-feeding pump

Abstract

The invention relates to an online monitoring method for the operation state of a large-sized variable-speed water-feeding pump. The method comprises the steps of recording the operation parameter of the water-feeding pump in a monitored state, according to a designed flow-head curve of the water-feeding pump, determining the numerical function of the boundaries of the normal operation area of the water-feeding pump, collecting the operation data of the water-feeding pump in a normal new running state, fitting out the flow-head performance curve of the water-feeding pump at a certain specific rotation speed after amendment, judging whether the water-feeding pump operates in the normal operation area or not according to the operation parameter of the water-feeding pump in the monitored state, if not, giving out an abnormal operation state alarm prompt, carrying out amendment till the certain specific rotation speed of the water-feeding pump is matched with the normal state curve according to the operation parameter of the water-feeding pump in the monitored state, and giving out an alarm prompt for the abnormal operation state of the water-feeding pump if the deviation between the rotation speed and the normal state curve exceeds a certain degree. By means of the method, the daily operation state of the water-feeding pump can be monitored, and judging criteria for the situation that the operation state of the water-feeding pump deviates from the normal operation area are provided

Description

technical field [0001] The invention relates to an online monitoring method for the running state of a large-scale variable speed feed water pump. Background technique [0002] As an important mechanical rotating equipment in the power plant, the large feed water pump undertakes the function of providing high pressure and large flow feed water to the boiler. With the development of power units with large capacity and high parameters, the reliability of feedwater pump operation in power plants has an increasingly important impact on unit operation. Taking a subcritical 600MW steam turbine unit equipped with two feedwater pumps as an example, if one feedwater pump fails abnormally, the output of the corresponding unit needs to be reduced by half. At present, the monitoring of the operation status of large-scale variable speed feed water pumps not only needs to judge whether the feed water pump is running in the normal area, but also needs to monitor the long-term operation st...

AI Technical Summary

Problems solved by technology

At present, the monitoring of the operation status of large-scale variable speed feed water pumps not only needs to judge whether the feed water pump is running in the normal area, but also needs to monitor the long-term operation status change trend of the feed water pump. The DCS measurement system currently operating on site cannot meet the above requirements.

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