It’s urgent! ! ! What type of flow meter should I choose in my situation?
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This post was last edited by zhao on 2010-4-14 at 15:23. My situation is as follows: 1. The gas being measured is gas, containing 32–45% methane (this percentage fluctuates from time to time), with the rest being air. Note that the methane content in the gas varies, so physical properties such as the density and viscosity of the gas under measurement can change at any time, which may result in large errors when using certain flow meters. 2. The pressure of the gas is very low, at only 0.5–1 KPa (which means that the flow meter must have low resistance). The temperature is between 20 and 30 degrees, and the flow rate is 7250 cubic meters per hour (which is quite high). 3. The pipe diameter is DN600 (inner diameter), which is quite large. 4. Our requirement for precision is that it should be as accurate as 0.5. In summary, it is a flow meter suitable for large bore sizes, low pressures, low flow resistance, variable components, and accurate measurement. The requirements are quite strict; I wonder if there’s anyone suitable available right now? Dear experts, please share some suggestions and recommend a suitable flow meter. I would like to express my gratitude here in advance; those who are proactive will surely receive extra rewards!
Waiting online for experts to give advice! :dizzy: 1# zhao
With such a large pipe diameter, only differential pressure throttling elements or electromagnetic types can be used. Obviously, electromagnetism is not suitable. The pressure loss of orifice plate flow meters is relatively high; since the venturi tube isn’t an option, the venturi must be chosen instead.
This post was last edited by CHEN333 on 2010-4-14 at 16:06. For such large pipe diameters, pitot flow meters or wedge flow meters can still be used, but it’s difficult to achieve very high accuracy (regardless of the type used)
Mass flow meter! The Coriolis mass flow meter is a direct-type mass flow measurement device that operates on the principle that, as fluid flows through a vibrating tube, a Coriolis force is generated that is proportional to the mass flow rate. Features: High reliability, good repeatability, high measurement accuracy, low pressure loss. No moving parts, wide measurement range, fast response time, no need for temperature or pressure compensation.
Applications: • Measurement of gas mass flow rate in industrial pipelines • Measurement of smoke flow velocity from chimneys • Measurement of flue gas flow rate in calcination furnaces • Measurement of air flow rate in gas processing systems • Measurement of compressed air flow rate • Measurement of gas flow rate during semiconductor chip manufacturing • Measurement of gas flow rate in wastewater treatment processes • Measurement of gas flow rate in heating, ventilation, and air conditioning systems • Measurement of gas flow rate in flux recovery systems • Measurement of combustion gas flow rate in boilers • Measurement of gas flow rate for natural gas, flare gas, hydrogen, etc. • Measurement of carbon dioxide flow rate during beer production • Measurement of gas mass flow rate in cement, cigarette, and glass manufacturing processes.
Disadvantage: The price is too high!
Applications: • Measurement of gas mass flow rate in industrial pipelines • Measurement of smoke flow velocity from chimneys • Measurement of flue gas flow rate in calcination furnaces • Measurement of air flow rate in gas processing systems • Measurement of compressed air flow rate • Measurement of gas flow rate during semiconductor chip manufacturing • Measurement of gas flow rate in wastewater treatment processes • Measurement of gas flow rate in heating, ventilation, and air conditioning systems • Measurement of gas flow rate in flux recovery systems • Measurement of combustion gas flow rate in boilers • Measurement of gas flow rate for natural gas, flare gas, hydrogen, etc. • Measurement of carbon dioxide flow rate during beer production • Measurement of gas mass flow rate in cement, cigarette, and glass manufacturing processes.
Disadvantage: The price is too high!
The flow meter of Aoniuba is fine; that’s the case for us as well
I think target flowmeters can be used for measurement; their cost is not very high, and if they are installed properly, their accuracy can also be ensured. I can’t remember which manufacturer it was; it seems to be a flow meter produced by an American company, available in both split and integrated versions.
:loveliness: Thank you all for your generous help. I’m sorry I can only give a low score; I tried my best
Mass flow meters cannot be used; currently, the maximum diameter of mass flow meters is only 300
In your case, a Coriolis flow meter definitely won’t work – the pipe diameter isn’t large enough for that. I recommend using thermal flow meters (with temperature and pressure compensation), of the insert type; install three such meters in designated areas along the pipeline, calibrate them for 32% CH4, 45% CH4, and 38% CH4 respectively, and then calculate the average value. This is a relatively scientific approach. Nowadays, this method is used in many applications such as measuring flue gas from flue gas desulfurization processes and blast furnace gas in steel mills. It offers a good cost-performance ratio, and the measurement results are accurate over the long term. A precision of 0.5 is fine. If you are interested, you can communicate with me on QQ: 724519789