The nitrogen production system is composed of compressed air device, compressed air purification device, pressure swing adsorption nitrogen production device, device and other equipment.

First, compressed air system

The compressed air system consists of a screw compressor and an air buffer tank to provide the air source required for the pressure swing adsorption nitrogen production plant. The system provides a stable output pressure and sufficient air volume. The air compressor is a screw air compressor with reliable operation, simple maintenance, low noise and no foundation operation. The air buffer tank is mainly used as a buffer for the air source, which plays a stabilizing and storage role, and can also collect and remove most of the oil and water condensate entering the compressed air source. Buffer tank with pressure gauge, safety valve, sewage outlet.

The exhaust capacity of the air compressor is slightly greater than the air consumption under the rated output of the nitrogen generator. Because its start and stop are controlled by the exhaust pressure, when the exhaust volume is greater than the consumption volume, the discharge pressure rises and the air compressor stops. Otherwise, the air compressor starts. Through such a cycle of start and stop, the air compressor exhaust volume is suitable for the air consumption requirements of the nitrogen machine, and to meet the operation needs of the production line in changing conditions (lower than the rated output).

Second, air purification system

The compressed air from the buffer tank first enters the C-level filter to achieve coarse filtration, and then enters the refrigerated dryer to force the compressed air to cool down, so that the water vapor in the air condenses, and the condensed liquid water carries dust and oil out of the machine. The cold dryer is best placed in the compression room. The process uses a freeze dryer to remove oil water, based on three reasons:

1, the maximum liquid load at the intake port of the T-level gas supply pipeline filter: 2000ppm w/w dew point < -12℃, do not use freeze dryer, T-level gas supply pipeline filter easy to fail;

2, winter outdoor temperature is low, compressed air temperature is reduced after the precipitation of water, blocking the pipeline system, the pipeline system needs to tilt and drain liquid;

3, the pipeline system is easy to corrosion and rust after precipitation of water.

The post-precision filter group of the cold dryer is composed of a two-stage filter. They are the T-class main flow filter and the A-class efficient oil mist removal filter. The T-class main flow filter has a precision of 1um, filters 1um and larger solid and liquid particles, and the residual oil content is 1ppm w/w. A high efficiency oil mist filter filtration accuracy 0.01um filter 0.01um and larger solid and liquid particles, 99.999+% oil mist; Residual oil content 0.001ppm w/w. The compressed air quality reaches ISO8573.1 quality grade 1.

Third, pressure swing adsorption nitrogen production system

The PSA carbon molecular sieve nitrogen production unit has two adsorption towers filled with carbon molecular sieve. Clean, dry compressed air enters the pressure swing adsorption nitrogen production unit and flows through the adsorption tower filled with carbon molecular sieve (CMS). Compressed air flows through the adsorption tower from bottom to top, using molecular sieve to adsorb nitrogen and oxygen under different pressures, oxygen, water, carbon dioxide and other components in the carbon molecular sieve table

Surface adsorption: unadsorbed nitrogen is collected as product gas at the outlet and flows out from the upper end of the adsorption tower into the buffer tank. After a period of time, the oxygen adsorbed by carbon molecular sieve in the adsorption tower reaches saturation and needs to be regenerated.

Regeneration is achieved by stopping the adsorption step and reducing the pressure of the adsorption tower. After a short period of pressure equalization, the adsorption tower begins to reduce pressure, and the adsorbed oxygen, water, carbon dioxide and other components are removed to complete the regeneration process.

The two adsorption towers are alternately adsorbed and regenerated to produce product nitrogen with stable flow and purity. The switch between the two adsorbers is automatically completed by a programmable valve controlled by PLC. The performance of a pressure swing adsorption nitrogen production device depends on the performance of the adsorber, carbon molecular sieve, process flow, equipment structure and electromagnetic pneumatic valve. The pressure swing adsorption nitrogen production device of our company is made of PLC programmable controller produced by Mitsubishi Corporation of Japan, BF carbon molecular sieve of Germany and electromagnetic pneumatic valve produced by BURKET company of Germany.

The adsorption force of nitrogen and oxygen under different pressures is different with molecular sieve, oxygen, water, carbon dioxide and other components in the carbon molecular sieve table



Surface adsorption: unadsorbed nitrogen is collected as product gas at the outlet and flows out from the upper end of the adsorption tower into the buffer tank. After a period of time, the oxygen adsorbed by carbon molecular sieve in the adsorption tower reaches saturation and needs to be regenerated.

Regeneration is achieved by stopping the adsorption step and reducing the pressure of the adsorption tower. After a short period of pressure equalization, the adsorption tower begins to reduce pressure, and the adsorbed oxygen, water, carbon dioxide and other components are removed to complete the regeneration process.

The two adsorption towers are alternately adsorbed and regenerated to produce product nitrogen with stable flow and purity. The switch between the two adsorbers is automatically completed by a programmable valve controlled by PLC. The performance of a pressure swing adsorption nitrogen production device depends on the performance of the adsorber, carbon molecular sieve, process flow, equipment structure and electromagnetic pneumatic valve. The pressure swing adsorption nitrogen production device of our company adopts PLC programmable controller produced by Mitsubishi Corporation of Japan, BF carbon molecular sieve of Germany and electromagnetic pneumatic valve of Shengmei Company of Taiwan.