Relationship between airspeed and system pressure
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It’s the conversion unit; if the system pressure is currently 45 kilograms, the space velocity through the catalyst is higher, compared to when the system pressure is 65 kilograms The amount entering the transformation remains unchanged!
With the same standard volumetric flow rate and the same temperature, the higher the pressure, the lower the volumetric flow rate under actual operating conditions, and the lower the space velocity. The unit of space velocity is per hour, which is the volumetric flow rate divided by the volume of the reactor bed.
The airspeed should be the same, according to the definition of airspeed
Assuming your load remains constant, the higher the pressure you control, the smaller the flow rate to the downstream area. Space velocity = flow rate/volume; with a constant volume, a lower flow rate results in a lower space velocity