The principle of nitrogen generator applied in the environmental protection industry
The application principle of nitrogen generators in the environmental protection industry is mainly based on pressure swing adsorption (PSA) and membrane separation technology. Both technologies can effectively separate high-purity nitrogen from the air.
Pressure Swing Adsorption (PSA) technology
Intake and compression: Firstly, the ambient air is compressed to a certain pressure through an air compressor, providing a power source for the subsequent separation process.
Air purification: Compressed air enters the air purification system and passes through multi-stage filters (such as dust removal, oil removal, and drying devices) to remove dust, oil mist, and moisture, ensuring the purity of the air entering the nitrogen oxygen separation system and preventing impurities from contaminating the adsorbent or damaging the equipment.
Nitrogen oxygen separation: The purified compressed air enters the PSA adsorption tower. The adsorption tower is filled with carbon molecular sieves that have strong adsorption capacity for oxygen. When compressed air passes through molecular sieves, oxygen molecules are preferentially adsorbed on the surface of the adsorbent, while nitrogen molecules are relatively difficult to adsorb due to their larger molecular diameter and slower diffusion rate, thus achieving preliminary separation of nitrogen and oxygen.
Regeneration and Switching: Nitrogen generators are typically equipped with two or more adsorption towers to achieve continuous gas supply. When one tower performs nitrogen oxygen separation, the other tower performs desorption (regeneration). The regeneration process involves reducing the pressure inside the tower or introducing a small amount of nitrogen reflux to desorb the oxygen adsorbed on the molecular sieve and discharge it outside the tower. Two towers alternate adsorption and regeneration according to a predetermined timing to ensure continuous nitrogen output.
Nitrogen collection and regulation: The separated nitrogen enters the nitrogen buffer tank through the nitrogen outlet valve, further stabilizing the pressure and flow rate, and then transported to the point of use. The control system monitors and adjusts the entire working process in real-time to ensure that the purity and production of nitrogen meet the set requirements.
Membrane separation technology
The membrane separator utilizes the different permeation rates of oxygen and nitrogen on the membrane to achieve separation through selective permeation of the membrane. Specifically:
When compressed air passes through a membrane separator, due to the higher permeation rate of oxygen molecules on the membrane than nitrogen molecules, oxygen molecules will pass through the membrane material faster, while nitrogen molecules will be relatively slower, thus achieving nitrogen enrichment and collection on the other side of the membrane.
Application scenarios
In the environmental protection industry, nitrogen generators are mainly used in the following areas:
Wastewater treatment: The nitrogen generated by the nitrogen generator can be used for aeration in the wastewater treatment process, increasing dissolved oxygen in the water, promoting microbial activity, and improving wastewater treatment efficiency.
Specification of nitrogen production device:
Nitrogen flow rate: 10-1000Nm ³/h (customized according to user requirements)
Nitrogen purity: 99~99.999%
Nitrogen pressure: 5-6 bar (pressure can be customized)
Control method: The equipment is controlled locally by PLC, and the main control room control is achieved through communication, which can achieve unmanned operation
Applicable environment: 5 ℃~37 ℃
Installation conditions: indoor, outdoor, frost resistant, load-bearing concrete floor, good ventilation
