Pipeline issues that occur during the parallel operation of blowers.
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Two centrifugal blowers, with identical performance. Gas handling capacity: 20,000 cubic meters per hour; gas density: 1.034 KG/cubic meter; temperature: 60 degrees; inlet pressure: 2000 PA; outlet pressure: 12,000 PA. The inlet pipe diameter is 800 millimeters, and the outlet pipe diameter is also 800 millimeters. The reason for asking this question is that currently two blowers are operating in parallel; the pressure meets the required levels, but the flow rate cannot be increased – it stays at a maximum of 18,500 cubic meters, which is equivalent to the performance of a single blower. Is it necessary to increase the pipe diameter? According to the performance curves in the principles of centrifugal compressors, for a parallel operation of two units with constant pressure and a slight decrease in flow rate, what should be the appropriate increase in pipe diameter? Also, during operation, the pressure in the inlet pipeline sometimes becomes negative, or the inlet pressure fails to rise and stays at just over 100 PA. Why does this phenomenon occur? I hope everyone can help answer this, or recommend some relevant books. Thank you!
The two blowers should have separate inlet pipelines to avoid interference with each other or vacuum formation. The diameter of the inlet pipe should be one to two sizes larger than that of the blower’s inlet pipe.
================================================================================== What you mentioned is a bit difficult to implement. Since there is also an electrostatic precipitator between the inlet pipeline and the thin-walled pressure vessel, it would be too costly to install another electrostatic precipitator when setting up a separate inlet pipeline, so the boss will definitely refuse. Another issue with re-piping is that increasing the diameter of the inlet pipe meets the flow rate and pressure requirements at the blower’s inlet, but what about the outlet? The pressure at the blower outlet is limited, and the 800-mm diameter pipe at the outlet cannot meet the user’s flow requirements; does the outlet also need to be equipped with piping? Could you please share some knowledge about gas pipelines, so that I can defeat him theoretically and avoid him keeping pulling my hair all the time?
In your case, it’s definitely necessary to add pipes; if you double the air volume without adding pipes, the flow rate will increase. An increase in flow rate inevitably leads to an increase in air pressure, and this increase isn’t by a factor of two, but by several times. If you don’t want to change the pipes, then you’ll need to modify the fan in order to increase its air pressure as well. This approach comes with high costs. I’m not sure what the purpose of the fan’s outlet is. You can use two sets of pipes