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Captgas equipment Co., Ltd-Suzhou
The working principle of PSA oxygen generator
Pressure Swing Adsorption (PSA) is an advanced gas separation technology, and it has an irreplaceable position in the field of gas supply in today's world.
The use of zeolite molecular sieve (CMS) to produce oxygen is mainly based on the difference in the diffusion rate of oxygen and nitrogen in the molecular sieve. Under a pressure of 0.6Mpa, that is, the diffusion rate of nitrogen on the surface of the molecular sieve is greater than that of oxygen, so that the zeolite molecular sieve preferentially adsorbs nitrogen. Most of the oxygen is concentrated in the non-adsorption box. The zeolite molecular sieve itself has the characteristics that the adsorption capacity of nitrogen increases when pressurized, and the adsorption capacity of nitrogen decreases when decompression. Using this feature, the pressure swing adsorption method is used to separate oxygen and nitrogen. So as to get 90% to 95% oxygen. The pressure swing adsorption oxygen generator adopts dual adsorption towers in parallel to alternately perform adsorption and oxygen production, decompression regeneration, to achieve air nitrogen and oxygen separation, and continuous oxygen production.
Overview of oxygen generator system process
First, the compressed air is provided by the air compressor (screw type), the liquid water and oil in the compressed air are removed through the air storage tank, and then through the refrigeration dryer,
The three-stage filter and activated carbon filter remove the water, oil and dust in the compressed air, and provide pure and stable compressed air for the oxygen generator, which is the raw material for us to produce oxygen. Then through the oxygen generator, the oxygen and nitrogen are separated by pressure swing adsorption to produce oxygen; the oxygen is detected by the oxygen precise analysis instrument, and the unqualified gas is automatically vented and alarmed (optional), and the whole interface is unmanned. operating.
Detailed description of oxygen generator process
Medium-pressure adsorption: Since the pore size of the zeolite molecular sieve is almost the same as the diameter of the oxygen molecule, in the case of medium pressure, the molecular sieve will choose to adsorb the nitrogen in the compressed air, but not the oxygen, so the oxygen flows out from the top of the adsorption tower. Achieve oxygen production.
Atmospheric regeneration: In the case of rapid venting, the molecular sieve will release the adsorbed nitrogen, so that the molecular sieve can be regenerated for the next use.
Pressure equalization of the two towers: After the work of one adsorption tower is finished, within two seconds (the time can be set), the gas from the tower is blown to the adsorption tower that is ready to work, so as to reduce the pressure rise time, and the pressure change is higher than the atmospheric pressure. When the working pressure is low, the scouring of the molecular sieve is reduced and the gas production is increased.
Backflushing: The working tower will be flushed with a small amount of oxygen to the vent tower to drive out the remaining nitrogen in the molecular sieve that is not vented, so that the molecular sieve of the regeneration tower is more fully regenerated.
Oxygen boost: Use the pure gas of the oxygen buffer tank to boost the pressure of the adsorption tower, increase the gas production rate, improve the gas purity, and achieve the specified purity quickly after startup.
Filling method of zeolite molecular sieve for oxygen generator:
Captgas’ molecular sieve packing adopts the "blizzard" method. This method uses professional molecular sieve charging tools to allow molecular sieve particles to be loaded into the adsorption tower at almost the same speed under a certain drop, and they are evenly packed in the adsorption tower. Packing, using this method can; make the molecular sieve packing density greater than 620g/l, even to 650g/l, packed tightly, reduce scouring during work, and improve use efficiency.
The structure of the adsorption tower is designed with Carbo Tech technology. Its core technology lies in:
1): Reasonable and efficient air distributor, so that the compressed air can fully pass through the molecular sieve without dead angle.
2): The butterfly-shaped head forms a very small upper and lower cavity in the adsorption tower to reduce the amount of compressed air.
3): The internal manufacturing is completed, and the inner wall is treated with shot peening, and the rust is bright.
Technical characteristics of oxygen generator
The oxygen production technology is provided by the German CarboTech company;
All main components are imported from Germany
Reliable valve control ----- Germany Burkert pneumatic valve 2000 / solenoid valve 6014
Advanced control system ----- Germany Siemens Programmable Controller (PLC) S7200/CPU224
Accurate analysis instrument ----- German fuel oxygen electrode, no need to replace for two years
High-efficiency zeolite molecular sieve ---- French CECA new molecular sieve
Unique compaction technology-----German Carbo Tech's "blizzard method" filling technology, this technology *be the world's most ** filling method, in terms of structure, the airflow distribution of the nitrogen generator is uniform, sufficient and without "dead corners" . Carbo Tech coconut mat is used on the top to form countless small fiber springs, so that the force of the zeolite molecular sieve is balanced, and there is no dead zone of force.