Measurement problems of the venturi flowmeter
Thread Content
Our plant uses average velocity flow meters to measure the combustion air volume in the alkali furnace, but there is a significant difference in the air volume between the main duct and the four branch ducts: the air volume at the fan outlet is 70,000, while the total air volume from the four branch ducts is less than 30,000. There are flow control orifice plates in place; experts, please analyze the reasons for this
What is the error that can occur if the design pressure, temperature, and range of an average velocity tube flow meter do not match the actual conditions?
The value of 70,000 at the fan outlet – is this determined by a flow meter or based on the fan’s output? If it is also determined by a flow meter, I believe there is an issue with the flow meter’s readings; this could be due to a fault in the flow meter itself, problems related to its installation, incorrect parameter settings, or issues with the selection of the flow meter. Each of these possibilities should be checked and ruled out one by one.
Upon inspection, there is air leakage in the intermediate air preheater. What is the effect of adding a flow restriction orifice in the middle on the flow rate?