HANGZHOU NUZHUO TECHNOLOGY GROUP CO.,LTD.

Today, let’s talk about the influence of nitrogen purity and gas volume on the selection of air compressors.

The gas volume of a nitrogen generator (nitrogen flow rate) refers to the flow rate of nitrogen output, and the common unit is Nm³/h

The common purity of nitrogen are 95%, 99%, 99.9%, 99.99%, etc. The higher the purity, the stricter the requirements for the system

The selection of air compressors mainly refers to parameters such as output flow rate (m³/min), pressure (bar), and whether there is no oil, which need to be matched with the input at the front end of the nitrogen generator

1.The air volume demand of the nitrogen generator for the air compressor

The nitrogen produced by the PSA nitrogen generator is separated from compressed air, so the nitrogen output is in a certain proportion to the required air volume.

The general air-nitrogen ratio (i.e., compressed air flow rate/nitrogen production) is as follows:

95% purity: The air-nitrogen ratio is approximately 1.7 to 1.9.

99% purity: The air-nitrogen ratio is approximately 2.3 to 2.4.

99.99% purity: The air-nitrogen ratio can reach 4.6 to 5.2.

2.The influence of nitrogen purity on the selection of air compressors

The higher the purity, the higher the requirements for stability and cleanliness of the air compressor.

Large fluctuations in air compressor air volume → Unstable PSA adsorption efficiency → decrease in nitrogen purity;

Excessive oil and water content in the air compressor → Activated carbon molecular sieve failure or contamination;

Suggestions：

For high purity, it is recommended to use oil-free air compressors.

It must be equipped with high-efficiency filters, refrigerated dryers and air storage tanks.

The air compressor should be equipped with an automatic drainage and constant pressure output system.

Main Points Summary：

✅ The higher the purity of nitrogen → the greater the air-nitrogen ratio → the larger the air volume required by the air compressor

✅ The larger the air volume, the higher the power of the air compressor. The power supply capacity and operating cost need to be taken into consideration

✅ High-purity applications → Oil-free air compressors + high-efficiency purification systems are recommended

✅ The air volume of the air compressor must meet the peak demand of the nitrogen generator and have a redundant design of 10 to 20%

Contact Riley to get more details about the nitrogen generator,

Tel/Whatsapp/Wechat: +8618758432320

Email: Riley.Zhang@hznuzhuo.com