Please give me some advice on installing explosion-proof fans in vent pipes.
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This is a feeding hopper. The materials in the hopper are prone to bridges. 0.3bar nitrogen is used for backflushing, resulting in serious indoor pollution. The current plan is to install an explosion-proof fan on the venting pipe to form a negative pressure inside the hopper and enhance venting. The vent pipe is 114.3 * 3.2 stainless steel pipe, install an explosion-proof fan according to this pipe specification. I don’t know how to select the fan. Please give me some advice.
This DN100 pipe is 18 meters long and leads to the outdoors. There are cloth bags at the ports, and the bags are cleaned regularly. I plan to install the blower above the hopper, at the elbow of the vent pipe.
In the design and calculation of a closed exhaust hood, the exhaust duct can generally be based on an exhaust wind speed of 18m/s. The air volume is converted to 510 cubic meters per hour. The pressure loss is calculated as 50 Pa per meter. For elbows, the resistance coefficient is 0.2. Add a few 0.2 for several elbows. For example, for 2 elbows, it is (1+0.2+0.2) multiplied by 50 and then multiplied by the pipeline length of 18. The resistance of the pipeline is 1360 Pa.
If the airflow passes through the dust collector first and then exits through the exhaust pipe, then add the pressure loss of the dust collector, and then the obtained is the static pressure of the fan. Just contact the manufacturer to select the model.
The explosion-proof model determines the explosion-proof level and type based on the flash point and minimum ignition energy of the chemical category of the medium involved.
Got it, the fan flow is 510 cubic meters per hour, and the static pressure is 1368 Pa. Thanks for the guidance, thank you
Just calculate how many elbows you have on site using this method. I mentioned two elbows as an example.
Well, I understand, thank you. I have determined the basic parameters and contacted the purchasing department.