Methods for measuring main airflow volume
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What methods do you all use for measuring the flow rate of the main fan in catalytic units? What are the advantages and disadvantages of these methods, and what is their accuracy and effectiveness? Please discuss
We use a venturi tube, and the accuracy is quite good. The main air flow rate is generally adjusted as a parameter, with the displayed data serving as a reference for adjusting it.
Are venturi tubes common? Why not use vortex flow meters?
For measuring the flow rate of the main fan in catalytic units, design institutes generally choose a method that involves using a venturi tube in combination with a differential pressure transmitter; this is a common measurement approach. Its advantage is that 2 to 3 flow meters can be connected to one venturi tube, which facilitates interlock control. The disadvantages are the requirement for a long straight pipe section, which is difficult to meet, and the equipment is bulky. Currently, built-in cone flow meters are preferred due to their light weight, ease of installation, and low cost
Does a venturi tube incur any power consumption? For example, does it waste electricity?