Requirements for the straight sections of CEMS
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Hello everyone. A CEMS is to be installed on-site to measure exhaust gases (including certain particles). The standard requirement for the straight pipe sections is \"4 meters in front and 2 meters behind\". The straight pipe section upstream already meets this requirement; however, a pipe tee needs to be installed in the downstream section. The distance between the center of this tee and the CEMS is only 750 mm, which is equivalent to one time the diameter of the pipe. The space on-site is very limited, with no extra room available. Therefore, I would like to ask: the pipe tee will create certain eddies in the flow of the medium. To what extent will these eddies have an impact? Could they affect the sampling components of the CEMS that are located 750 mm away? Could anyone please send me a document or standard regarding the range of influence of eddy currents? Urgently needed, thanks!
The pressure of the flue gas is not high to begin with; it doesn’t matter whether the CEMS draws air from here to measure SO2 and nitrogen oxides. The sampling unit of the table, not to mention, also has an air pump
Who told you there are requirements for straight sections? Do you measure traffic?
;P has installation requirements; if they are not met, it is necessary to consult the designer to find a solution
With little exposure, there are no guidelines in this regard
What should be the diameter of the flue?~~ If the latter two conditions cannot be met, the distance from the flue gas exhaust outlet should be at least 1/2 of the flue diameter~~ Additionally, when the installation location of the CEMS does not meet the installation requirements specified in the first four and latter two conditions, it is necessary to check whether there are manual monitoring holes provided in the area near the CEMS installation site~~
Now, as for the 5-yuan option, CEMS generally uses a direct sampling method; there are requirements regarding the installation location, but it’s not some absurd rule like placing sensors in the front 4 and back 2 positions – that’s way too metaphysical. Unless it’s for measuring temperature, pressure, and flow.
Which CEMS do all the experts use? ?