Selection of inlet flow meter for VOCs oil vapor recovery unit
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I would like to ask the experts here. For a project I’m working on, a flow meter needs to be installed on the pipeline at the fan inlet, before it reaches the oil and gas recovery device. The pressure in this section is very low, ranging from -50 to 500 Pa, and the pipeline diameter is DN500. I’m not sure which flow meter to choose; could the experts please advise me on the most suitable option?
First, determine with the process team whether it makes sense to measure flow at this location and whether it is necessary to install such a device; several sets have been built without any requirement for flow monitoring. If it’s really necessary, one could consider bar-type or thermal types; though they might not work well either. It just depends on the trends.
In this case, as long as there is no blockage, a differential pressure flow meter will work fine. It doesn’t matter if the upstream pressure is low; the flow meter is located at the fan inlet, so the downstream pressure will be even lower. And this situation does not require high precision. Therefore, a differential pressure flow meter is feasible.
The opinions from the 2nd floor are great, and that’s indeed how things are in reality.
Checking the flow rate; let’s consider using a venturi tube
Target-type or insert-type Ba types work, right? Or a thermal mass flow meter
VOCS gases contain a large amount of various impurities such as dust, tar, and water vapor; differential pressure flow meters are prone to blockage of the pressure measurement ports. For media like coke oven gas, producer gas, flue gas, and VOCS gases, which have low pressure and low flow rates and are prone to blocking of the pressure measurement ports, an HKB capacitive target flow meter is a more suitable choice! The HKB series of target flow meters utilize third-generation capacitive force-sensing sensors, which are resistant to dirt, highly sensitive, easy to install with no maintenance required, and offer accurate measurement. They overcome the drawback of traditional differential pressure transducers, which tend to get clogged, and can completely replace differential pressure flow meters. It has low pressure loss, is suitable for large pipes, irregularly shaped pipes, as well as pipes under low or negative pressure; it features an insert-type design for easy installation. It is widely used for measuring gas media such as coke oven gas, blast furnace gas, generator gas, and mixed gas in the metallurgical and coal chemical industries. These media are characterized by the presence of impurities, dust, fouling, low pressure, and low flow rates; they do not cause blockages and require no maintenance, thus helping customers save on maintenance costs.
Hehe, someone upstairs has given useless advice; if you listen to them, you’ll definitely end up in trouble.