Technical analysis
Pressure swing adsorption nitrogen production technology is widely used in chemical, electronics, textile, coal, petroleum, natural gas, medicine, food, glass, machinery, powder metallurgy, magnetic materials and other industries.
In view of the different requirements of different users in different industries for the use of nitrogen, PSA nitrogen production equipment - PSA nitrogen plant fully meets the gas requirements of different users with nitrogen generation system.
The nitrogen generating - psa nitrogen generator unit has the characteristics of simple process flow, normal temperature production, high degree of automation, convenient startup and shutdown, fewer wearing parts, easy maintenance, and low production cost.
Working principle
The nitrogen generator is based on the principle of pressure swing adsorption, using high-quality carbon molecular sieves as adsorbents, and producing nitrogen from the air under a certain pressure.
The purified and dried compressed air is subjected to pressure adsorption and decompression desorption in the adsorber.Due to the kinetic effect, the diffusion rate of oxygen in the micropores of the carbon molecular sieve is much greater than that of nitrogen. When the adsorption does not reach equilibrium, the nitrogen is enriched in the gas phase to form the finished nitrogen.Then the pressure is reduced to normal pressure, and the adsorbent desorbs the adsorbed oxygen and other impurities to realize regeneration.Generally, two adsorption towers are installed in the system. One tower absorbs nitrogen and the other tower desorption and regeneration. The two towers are automatically controlled by PLC program to make the two towers work alternately to achieve the purpose of continuous production of high-quality nitrogen.
Technical advantages of energy-saving nitrogen generator
- Easy to install
The equipment has a compact structure and is skid-mounted as a whole. It occupies a small area and does not require large capital investmen.
2. High quality carbon molecular sieve
It has large adsorption capacity, high compressive performance and long service life. The service life of normal operation can reach 10 years.
3.Fail-safe system
Configure fault system alarm and automatic start function for users to ensure the safety of system operation.
4.More economic than other nitrogen supply methods
The PSA process is a simple nitrogen production method that uses air as a raw material and consumes only the electric energy consumed by the air compressor. It has the advantages of low operating cost, low energy consumption, and high efficiency.
5. Integrated design of electromechanical instrument to realize automatic operation
Imported PLC control automatic operation. Nitrogen flow, pressure and purity can be adjusted and displayed continuously. Pressure, flow and purity alarms can be set, and remote automatic control, detection and measurement can be realized, realizing truly unmanned operation. The advanced control system makes the operation easier, can realize unattended and remote control, and can monitor various working conditions in real time, thus ensuring the stability of gas purity and flow.
6.High-quality components are the guarantee of stable and reliable operation
Pneumatic valves, electromagnetic pilot valves and other key components adopt imported configuration, reliable operation, fast switching speed, service life of more than one million times, low failure rate, convenient maintenance and low maintenance cost.
7. Continuous display of oxygen content, automatic alarm system for exceeding limit
Online monitoring of nitrogen purity to ensure that the required nitrogen purity is stable.
- Advanced filling technology ensures the service life of the equipment
The advanced filling technology is adopted to make the molecular sieve evenly distributed without dead corners and not easy to pulverize; the adsorption tower adopts a multistage air distribution device and a balanced automatic compaction device. Ensure the adsorption performance and compaction of the carbon molecular sieve, effectively extending the service life of the carbon molecular sieve.
- Automatic emptying system of unqualified nitrogen
The low-purity nitrogen at the beginning of the start-up is automatically emptied, and air is sent when the target is reached.
- Ideal purity selection range
Nitrogen purity is easy to adjust. It can be adjusted arbitrarily between 79% and 99.99% with high purity nitrogen generator according to the needs of users. With the unique purification technology, the nitrogen purifier is connected in series in the subsequent stage to produce 99.9995% high purity nitrogen.
- The unique cycle switching process of the system
Reduce the wear of the valve, prolong the service life of the equipment and reduce the maintenance cost.
The process
The nitrogen generator is composed of adsorber, pneumatic shut-off valve, buffer filter, nitrogen buffer tank, pressure regulating valve, flow meter, instrument control and other parts.The raw material air is pressurized to 0.8MPa by an air compressor, and a large amount of oil, water, dust and other impurities are removed through the compressed air purification system, and then enters the adsorber.The purified dry and pure raw air passes through the buffer filter and enters the bottom of the adsorber. After the airflow diffuses through the distributor, it enters the adsorber filled with carbon molecular sieve for pressure swing adsorption and separation of oxygen and nitrogen.Nitrogen is enriched in the gas phase and enters the nitrogen buffer tank, pressure regulating valve, and flow meter as a product from the upper outlet, and the exhaust gas is discharged at the end of the muffler.