Real-time online cavitation monitoring and warning system and real-time online cavitation monitoring and warning method for water pump of thermal power station

Abstract

The invention discloses a real-time online cavitation monitoring and warning system and a real-time online cavitation monitoring and warning method for a water pump of a thermal power station. The real-time online cavitation monitoring and warning system comprises an external monitoring unit, the monitoring objective water pump, a pipeline flow sensor, a pump upstream temperature sensor and a pump upstream pressure sensor. The external monitoring unit is connected with a DCS (distributed control system) of the power station. The real-time online cavitation monitoring and warning system and the real-time online cavitation monitoring and warning method have the advantages that the external monitoring unit is bidirectionally communicated with the DCS of the power station via a standard industrial MODBUS serial port supported by the conventional DCS of the power station, measured signals, which are transmitted by the DCS of the power station, of the pipeline flow sensor, the pump upstream temperature sensor and the pump upstream pressure sensor are received, pump cavitation check results are transmitted to the DCS of the power station, prompting and warning effects can be realized by the aid of built-in warning and prompting modules of the DCS of the power station, and operation staffs can be prompted; the real-time online cavitation monitoring and warning system and the real-time online cavitation monitoring and warning method have an important significance on upgrading the equipment management level of a thermal power plant, prolonging the service life of critical equipment and reducing the maintenance and repair costs.

Description

technical field [0001] The invention relates to the technical field of thermal power station automatic control, in particular to a real-time on-line cavitation monitoring and early warning system and method for a water pump in a thermal power station. Background technique [0002] Water pump is one of the most common industrial equipment, which is widely used in various production processes to increase the pressure of liquid working medium, and has a wide range of applications. Cavitation (cavitation) is one of the main factors of water pump damage, and it is also an item that must be checked for pump selection during the system design stage. When the water pump is working, it sucks low-pressure liquid working medium from the inlet, and after the pump blades do work to increase the liquid pressure, it sends out high-pressure liquid from the pump outlet. At the suction end of the pump, the pump creates a lower low-pressure zone through the movement of the pump blades and the...

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Problems solved by technology

However, the primary consideration in the design and selection of the pump is the functional requirements of the pump in the process technology. How to select the pump to meet the requirements of the maximum flow and the highest head, which also leads to the working conditions used in the selection and verification of the pump. Basically, it is near the rated flow and pressure conditions, and the relevant cavitation check calculations for partial load or start-stop conditions are basically not performed, which also leads to the fact that the pump is often unavoidably in the process of changing working conditions and start-stop processes during actual work. There is a risk of cavitation in the middle, but there is no means and information for the operator to refer to. The only way to disassemble the pump during maintenance is to find damage or to rely on manual regular inspections of the noise and vibration of the pump. , but the extremely low frequency of the latter is basically unable to capture the short cavitation process of start-stop or changing working conditions, but even instantaneous cavitation will cause incalculable damage to the equipment, which leads to pumps in the power station system Cavitation damage is still the main cause of failure

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