A low-temperature waste heat power generation working medium pump cavitation detection device and method

Abstract

The invention discloses a low temperature exhaust heat power generation working medium pump cavitation detecting device and method. The detecting device comprises an alternating current electric energy production detecting circuit for detecting an alternating current real-time electric quantity signal sent by a low temperature exhaust heat power generation device; output of the low temperature exhaust heat power generation is further connected with a direct current power source through an alternating current-to-direct current circuit, and a direct current electric quantity detecting circuit obtains electric quantity signals, converted into direct current, of the low temperature exhaust heat power generation in real time; the alternating current electric energy production detecting circuit and the direct current electric quantity detecting circuit are both connected with a microprocessor, and the microprocessor controls the running state of a motor, connected with a working medium pump, in the low temperature exhaust heat power generation device; a noise measurement sensor located on a working pump is connected with the input end of the microprocessor; and the microprocessor receives an external control command. By detecting noise numerical value of the working medium pump in work, in cooperation with the electricity generation state of the low temperature exhaust heat power generation system, the running state of the working medium pump is judged, and the running conditions, such as abnormity alarming, starting, stopping and the like, of the working medium pump are controlled.

Description

technical field [0001] The invention relates to the field of power generation, in particular to a cavitation detection device and method for a working medium pump for low-temperature waste heat power generation. Background technique [0002] In practical applications, it is found that the most common reason for the failure of the working fluid circulation pump of the low-temperature waste heat power generation unit is cavitation, and a slight cavitation can cause a rapid decrease in the power generation of the system. Severe cavitation may cause damage to the working fluid pump, so measures should be taken in the system to accurately detect the cavitation of the working fluid pump, and then control the operation of the working fluid pump. [0003] The cavitation phenomenon of the working medium circulation pump is generally due to the lack of liquid accumulated in the liquid storage tank connected to the condenser, which causes the working medium pump to suck up during opera...

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Problems solved by technology

[0004] The first situation is that the liquid level of the organic working medium in the liquid storage tank is not enough due to insufficient filling of the working medium in the early stage of the experiment, which fails to form a stable liquid level in the liquid storage tank when the unit is running.

[0005] The second situation is that the condensation effect of the condenser is not good, and the expansion exhaust steam cannot be condensed into a liquid working medium by the condenser in time, resulting in the failure of an effective liquid level in the liquid storage tank to meet the normal operation of the working medium pump.

The poor heat transfer effect of the condenser is due to factors such as insufficient heat transfer area of ​​the condenser or small heat transfer coefficient. heat, reduce the heat transfer coefficient, and after long-term operation, dirt on the inner wall of the condenser adheres to the heat transfer surface, reducing the heat transfer area of ​​the condenser, etc.

[0006] The third reason for the cavitation phenomenon of the working medium pump is that the selection of the working medium pump is unreasonable

The actual liquid level detection value is set too high or too low, making it difficult to accurately grasp the demand for working fluid

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