Feed pump turbine smoke exhaust system and method capable of monitoring and adjusting negative pressure value on line

Abstract

The invention discloses a feed pump turbine smoke exhaust system and method capable of monitoring and adjusting a negative pressure value on line. The system comprises a front bearing box, a lubricating oil tank, a pressure transmitter, an electric flow adjusting valve, an oil-gas separator, an electric stop valve, a variable-frequency smoke exhaust fan, a front bearing box smoke exhaust pipeline, a separated oil recovery pipeline and a lubricating oil tank smoke exhaust pipeline. The optimal negative pressure value of the lubricating oil tank and the front bearing box is calculated through the liquid level change of the lubricating oil tank, the maximum air inflow of an oil baffle of the front bearing box and other parameters, the actual negative pressure value is monitored in real time through the pressure transmitter, the actual negative pressure value and the optimal negative pressure value are kept consistent through the electric flow adjusting valve and the variable-frequency smoke exhaust fan, the negative pressure value is monitored and adjusted on line, and the accidents of unsmooth oil return of the lubricating oil tank, water and impurities entering the front bearing box, oil leakage and the like caused by too large or too small negative pressure value are avoided; and one used smoke exhaust fan and one standby smoke exhaust fan are arranged on a smoke exhaust pipeline of the lubricating oil tank, online real-time switching is achieved, and the accident of shutdown caused by faults such as blockage of a filter screen of the smoke exhaust fan is avoided.

Description

technical field [0001] The invention relates to the technical field of steam turbine generating set lubrication, and more specifically, to a feedwater pump steam turbine smoke exhaust system and method capable of online monitoring and adjustment of negative pressure values. Background technique [0002] With the continuous improvement of the intelligence level of power plants, the requirements for the automation level of related equipment are also getting higher and higher. In the prior art, in the lubricating oil system of the traditional feedwater pump steam turbine, in terms of flue gas exhaust, a negative pressure gauge is generally installed on the oil tank to monitor the negative pressure value of the lubricating oil tank. However, this method cannot control the negative pressure value in the lubricating oil tank on the one hand, and when the pressure value is abnormal, the situation of poor oil return cannot be avoided. Also can't control the negative pressure value ...

AI Technical Summary

Problems solved by technology

However, this method cannot control the negative pressure value in the lubricating oil tank on the one hand, and when the pressure value is abnormal, the situation of poor oil return cannot be avoided.

On the other hand, it is also impossible to control the negative pressure value in the front bearing box

The negative pressure value in the front bearing box is very critical. If it is too low, it will cause poor oil return, increase the bearing temperature and cause oil leakage in the bearing box; Large negative pressure will suck the steam leaked from the unit and the impurities in the surrounding environment into the bearing chamber. After the steam and impurities enter the bearing box, they will enter the lubricating oil system with the return oil, polluting the lubricating oil

[0003] With the continuous development of high-end manufacturing at home and abroad, for manufacturing companies, traditional products can no longer meet the new needs of modern intelligent power plants, and it is urgently required to continuously improve the intelligence and automation of their products and improve the safety of equipment Work efficiency, intelligent management level

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