How to Calculate the Required Air Compressor Flow Rate for a Nitrogen Generator
Release time:
2025-06-20
Calculation Method for Matching Screw Air Compressors with Nitrogen Generators
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Flow Rate Matching
The air flow rate from the compressor (Q2) must be proportional to the nitrogen output required by the generator (Q1).
For example, if a nitrogen generator produces 3 m³/min of nitrogen at 99.9% purity, the air compressor must supply approximately 3 × 3.5 = 10.5 m³/min of compressed air. -
Pressure Matching
The working pressure of the nitrogen generator (P1) and that of the air compressor (P2) are inversely related.
Typically, the air compressor's discharge pressure should be 1–2 bar higher than the required pressure at the point of use, to compensate for pressure losses in the pipeline.
Step-by-Step Process
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Determine Nitrogen Requirements
Define the nitrogen generator’s parameters based on production needs—flow rate, purity, and pressure.
For instance, if a factory requires 1,000 m³ of nitrogen per day at 99.9% purity and 3 bar pressure, these figures will guide equipment selection. -
Calculate Required Air Supply
Based on the desired purity and nitrogen flow, calculate the corresponding air supply needed.
For 99.9% purity, the ratio is approximately 1:3.5. So, 1,000 × 3.5 = 3,500 m³/h of air is required from the compressor. -
Account for Pressure Drop
In the selection process, consider pressure loss through the piping system. The compressor’s discharge pressure should be set higher than the actual usage pressure to maintain system efficiency. -
Choose the Right Compressor Type
For small systems, piston compressors may be sufficient. However, for medium to large-scale applications, screw air compressors are preferred due to their efficiency, durability, and steady air delivery.
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