There are many flowmeters for measuring compressed air. Due to the different production requirements of each enterprise, the flow of compressed air is also different. This paper proposes solutions for the measurement of the flow rate of compressed air in small flow, and hopes to help the majority of users. For the measurement of the flow rate of compressed air in small flow, there are mainly two options. One is to use a thermal gas mass flow meter with a low flow measurement lower limit and a wide range; the other is to reduce the diameter of the vortex flowmeter to meet the measurement requirements. .
Give an example to illustrate it. A user's on-site pipeline is DN50, the minimum flow is 10m3/h, and the maximum flow is about 110m3/h.
The normal DN50 vortex flowmeter like this kind of working condition can't reach the measurement effect at all. To achieve the measurement effect, you must wake up and shrink the diameter. You can reduce the flowmeter to DN25 caliber, and the range can be done. To 8-120m3/h. Say here I have to say a few words, vortex street is not anti-vibration, measuring the main source of compressed air is the compressor and the blower, so when installing vortex street must be away from the compressor, blower and other vibration sources. At the same time, the compressor and blower outlets have a certain amount of pulsating flow, which also affects the measurement of vortex street. To solve the problem of pulsating flow, apart from the compressor and the blower, it is also possible to install a buffer tank at the outlet of the compressor and install the vortex street behind it. Generally, the system of the double compressor is designed in this way.
If the site vibration is too large to install vortex street or if you want to use a better flow meter, you can use a hot gas mass flow meter. Its range can reach 0.7-700m3/h. We must pay attention to it here. With temperature and pressure compensation, the flow rate under standard conditions is displayed, and the unit of flow rate is Nm3/h. This is based on the actual pressure and temperature of the site. Compressed air often contains some water vapor. If there is more moisture, install a filter before the flowmeter that does not affect the measurement accuracy.
Some people say that in addition to these two options, gas turbine meters can also measure compressed air with a small flow rate. I personally do not recommend users to use turbines because the flow rate of compressed air is not stable. Impaired impeller.
A small flow compressed air measurement solution If you have any questions or other insights, feel free to discuss them. Heshunda flowmeter manufacturers as speed-type meters, volumetric meters, differential pressure meters, area instrument professional manufacturers, has always insisted on research and development of new technologies and new products. Summing up the experience in production practice over the years, actively communicating with the domestic and international flow fields, striving to develop various flow measurement products and forming a large-scale, systematic, and diversified production pattern. Heshunda looks forward to working with you to make progress together.
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