Restricting orifice plate
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I would like to know how many people have actually used the flow-limiting orifice plate, and how many levels at most. There is a big gap between theory and practice. Due to the large pressure loss when measuring gas, the flow rate is too fast, and the last one or two stages seem to be unable to achieve the pressure reduction effect. The flow rate is too high and the pressure loss is not enough to meet the requirements. Is there a standard requirement or experience value for the straight pipe sections before and after the flow-limiting orifice plate? I hope everyone can share what they know or have actual experience with.
We have also encountered the problem you mentioned. In our device, a two-stage flow-limiting orifice plate was used for the cyclone separator backflush gas and catalyst backflush gas. The designed aperture diameter was 2.5/1.2, but in actual use it could not meet the requirements. Problems such as pressure drop was too small, aperture blockage, catalyst backflow and other problems occurred. Later, we installed a three-stage flow-limiting orifice plate ourselves to increase the pore diameter. Some third-stage pore diameters were increased to 1.8--2.0, which basically satisfied the use of the device. our feeling is: There are always differences between design and actual use. You cannot blindly trust the original design data.