How to determine the outlet pressure of an air compressor? Seeking advice from experts
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The reaction requires oxygen from compressed air; the reaction pressure is 9 kilograms, and an air flow rate of approximately 20,000 cubic meters per hour is needed. The distance from the compressor outlet to the reactor inlet is about 60 meters, with a pipe diameter of 10’’
Get a book on Principles of Chemical Engineering; it has a section on fluid transport. Generally speaking, this includes the material of the pipes, the pipe fittings, the resistance exerted by valves and related equipment on the fluid, as well as the viscosity of the fluid, all of which need to be taken into account. If you calculate it in detail, it’s quite complicated. A 10-inch pipe is equivalent to DN300 for calculation purposes. Let’s do a rough macro estimation: for an output of 9 kg, at the outlet after a distance of 60 m, would it be feasible to use 8.5 kg? Also, you haven’t specified what the pressure at the user terminal 60m away should be.
1. It must be greater than the reactor pressure. 2. Calculate the pipeline resistance: Use the guidelines SH/T 3035-2018 or HG/T 20570.6-1995 for selecting pipe diameters in petrochemical processes, and calculate the pipeline resistance (including straight-line resistance and local resistance); typically, the pressure drop per 100 meters in gas pipelines is less than 10 KPa. 3. Take into account the resistance caused by flow meters and control valves on the pipeline. 4. If there are other devices between the air compressor and the reactor (such as heat exchangers), the resistance associated with these devices also needs to be considered. The outlet pressure of the air compressor should be greater than the reactor pressure plus the total resistance loss
Isn’t it determined based on the process requirements of the device? You can’t decide on the manufacturer of your air compressor equipment; you have to follow what’s available.