Is it feasible to measure the pressure or differential pressure of dust-containing flue gas using a purge pipe?
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As shown in the diagram, this project uses electrostatic precipitators and bag filters, which are typically installed at both the front and back of the system. For measuring flue gas pressure or differential pressure, this type of purge gas is used. I asked those on site, and it turns out that compressed air is used on a regular basis, at a pressure of 3–6 kilograms per square centimeter. Could this have a significant impact on the readings of the pressure transmitters or differential pressure transmitters?
It is feasible to measure the pressure or differential pressure of dust-containing flue gas using a purge tube. The purge tube uses compressed air to purge the inside of the flue gas pipeline and the sensors, in order to prevent dust accumulation and ensure measurement accuracy. However, it should be noted that the pressure and flow rate of compressed air can have a certain impact on the display values of pressure transmitters or differential pressure transmitters. If the pressure of the compressed air exceeds the transmitter’s measurement range, it can lead to inaccurate measurement results or even damage to the sensor. Therefore, it is necessary to ensure that the pressure of the compressed air is within the measurement range of the transmitter, and make adjustments according to specific conditions. Additionally, attention must also be paid to the dryness of the compressed air. Compressed air containing moisture may cause condensation inside the transmitter, affecting the measurement results. Therefore, it is recommended to ensure that the compressed air is dried while using a purge tube, in order to avoid interference from moisture in the measurements. In summary, it is feasible to use a purge tube to measure the pressure or differential pressure of dust-containing flue gas, but attention must be paid to the pressure and dryness of the compressed air to ensure accurate and reliable measurement results. .
This post was last edited by liu530014416 on 2023-8-3 10:13. No, I’ve tried it – with the air-operated level gauge at 60L/h and 240L/h, the liquid level remains practically unchanged. The blowing device is equipped with a constant-flow valve, and a pressure stabilizing and reducing valve can be installed in front of it.
The pressure we use is generally 6 kilograms; even when using throttling, it’s still 2-3 kilograms. This pressure is quite high for flue gas, which operates within a range of 0.1-10 kPa. Yet we continue to use this pressure on site without any issues, and I’m not sure whether this is appropriate or not
What is this device used for?
Purging of the pressure lead pipes for level gauges or pressure transmitters can be done using either method
It’s feasible; Sichuan Tianhua Fubang adopted this method back in 2006
The key point is that it keeps blowing non-stop while we use it
I forgot what the medium is; I only remember that the properties of that medium require the pressure guide tubes to be blocked