Compressor and blower outlet fluid mostly contains some pulsation

For large-diameter orifice flowmeters used to measure compressed air flow, water often accumulates in front of the orifice, which will affect the measurement accuracy. There is often a section of water in the pressure pipeline, which causes the differential pressure measured by the differential pressure transmitter to be inconsistent with the differential pressure generated by the throttling device. These are common causes of errors caused by water in the air. In addition, due to the high content of nitrogen oxides in the urban atmosphere, the water droplets contained in the compressed air are acidic, causing corrosion on the surface of the ring chamber and corrosion on the inner wall of the pipeline, making the surface rough. When the iron oxide produced by corrosion becomes dry under certain conditions, it is easy to fall off from the inner wall of the tube and be brought to the orifice plate by the air flow, which will also affect the flow indication value. Therefore, these powdery and lumpy garbage should be removed during parking for maintenance. pulsating flow. Compressor and blower outlet fluids mostly contain some pulsation. For example, a reciprocating compressor shows a half-wave pulsation, as shown in Figure 3.14. It can be observed in the field that the outlet pressure of the compressor and blower has obvious swings. Among them, the outlet pulsation frequency of the positive (constant) displacement blower is relatively high, generally tens of hertz, while the outlet pulsation frequency of the reciprocating compressor is relatively low, generally several hertz. Flow pulsation causes differential pressure flowmeters, vortex flowmeters and other flowmeters to show high values, causing the float in the float flowmeter to jump up and down. There are two commonly used methods to eliminate and weaken the influence of flow pulsation on the indication value of the flowmeter: one is to install a buffer tank at the outlet of the compressor to filter out the pulsation, and install the flowmeter behind the buffer. The system is designed in this way; the second is to install the flowmeter away from the pulsation source, so that the gas capacity of the process pipeline and its pipe resistance can be used to form a low-pass filter to attenuate the pulsation.

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