Features of compressed air flow measurement

Characteristics of compressed air flow measurement ① Large vibration. Air flow meters installed in both compression plant and blower rooms have to consider vibration issues. This vibration mainly comes from the compressor and blower, and the vibration of the machine can be transmitted to a long distance through the air duct or air duct. Among them, the reciprocating compressor has the largest vibration. The vibration generated during the operation of a large reciprocating compressor often drives the plant and the surrounding ground to vibrate together, which poses a threat to the accurate and reliable operation of related air flow meters. It causes the fulcrum of the lever differential pressure transmitter to move and cause the instrument to drift. The vibration causes the vortex flow sensor to produce an interference signal corresponding to the vibration frequency, causing the flow indication to be significantly higher. ② gas with water. Compressed air is taken from the atmosphere, which always contains some amount of water vapor. Partial pressure of water vapor&express. The saturated partial pressure of water vapor in the atmosphere is a function of the atmospheric temperature (see Table 3.5). In rainy and foggy days, the partial pressure of water vapor in the outdoor atmosphere reaches saturation, that is, the relative humidity reaches 100^. Just like compressing a sponge that absorbs enough water, as the volume shrinks, a corresponding amount of water is precipitated. This is the simple principle of compressing air to carry water. In fine weather, the relative humidity of the atmosphere is low, but as it is compressed After the volume shrinks to a fraction of its original size, the partial pressure of water vapor will increase accordingly, and it may also enter a saturated state and precipitate water droplets.

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