Pressure swing adsorption nitrogen machine is an advanced gas separation technology using carbon molecular sieve as an adsorbent, it has an irreplaceable position in the field gas supply in today's world, widely used in all walks of life, in the existing hundreds of nitrogen production enterprises, how to choose a nitrogen machine with good performance, is the preferred problem for many customers. The selection of a nitrogen machine involves many problems, but as long as we carefully analyze, compare and grasp the key points, we can get satisfactory results.

The main components of air are nitrogen and oxygen, and the adsorption properties of nitrogen and oxygen in different atmospheres of zeolite are appropriate in the design process of PSA oxygen generator, leaving the separation of nitrogen and oxygen at the ambient temperature. The zeolite has a stronger nitrogen adsorption capacity than oxygen (nitrogen ions and a strong effect on the zeolite surface). When the air under pressure is adsorbed by zeolite zeolite containing nitrogen, the zeolite adsorbent bed is oxygen, because the adsorption is enriched in the vapor phase less to the bed, so that oxygen and nitrogen are separated to obtain oxygen. When the molecular sieve adsorbs to the saturation of nitrogen, the air is stopped and the pressure of nitrogen adsorption becomes resolved in the adsorbent bed to reduce the regeneration and reuse of the zeolite molecular sieve. With two or more adsorption beds alternately switching work, you can constantly produce oxygen. Adjacent to the boiling points of oxygen and nitrogen, it is difficult to separate the two, together with meteorological enrichment. As a result, PSA oxygen production devices usually only get 90% to 95% oxygen, also known as enrichment. With low temperature air separation devices, it can be compared by an oxygen concentration of more than 99.5%. A bed swing adsorption oxygen generator must consist of two steps; Adsorption and resolution. In order to obtain continuous product gas, oxygen equipment is usually more than two bed parts, and from the point of view of energy consumption and stability, in addition to setting the necessary additional steps. Generally, the operation is repeated periodically after each bed adsorption, pressure release or vacuum regeneration, flushing displacement and pressurization. At the same time, in the adsorption pressure swing adsorption oxygen bed in different steps, respectively in the PLC switching control timing, so that the adsorption bed coordination number in the staggered step implementation, the pressure swing adsorption device operation to run smoothly, continuous access to product gas. For use in the actual separation process, air must also be considered among other trace components. The water adsorption capacity of carbon dioxide and nitrogen and oxygen is generally much larger than that of the adsorbent, and pressure swing adsorbent oxygen can be added to fill the adsorbent bed appropriately so that it is removed by adsorption.

When loading and filling must have a special technology, otherwise it is easy to powder and lead to failure, from the process of carbon molecular sieve adsorption tower, we can find that when the compressed air from the bottom of the absorption tower into the high speed, pressure adsorption nitrogen machine involved in the machine, in the equipment of long-term stability of the electrical, instrument setting one high-tech products is particularly important. If there is no special gas distributor, the molecular sieve through the strong impact of air friction, easy to cause powder molecular sieve. Another molecular sieve adsorption column is absolutely impossible to fill tight, PSA nitrogen machine after a period of use, in the reduced gap between the molecular sieve, slowly sinking, if not for the automatic filling device and molecular sieve clamping device, the upper part of the adsorption column space would be obvious. When compressed air enters the lower part of the adsorption tower, the molecular sieve will be under the action of the impact force in a very short flow of fast-moving events, resulting in the zeolite collision resulting in friction and shock absorption of the tower wall, so it is easy to make the zeolite powder fail. (The companies did not elaborate.) Because the air contains some water and oil vapor, after compression, if there is no strict air purifier, the oil vapor may be difficult to adsorb and desorption carbon molecular sieve, filling the holes of the molecular sieve, resulting in the failure of molecular sieve "poisoning". Therefore, before the compressed air enters the adsorption tower with a strict air purification device, it is essential to ensure the life of the molecular sieve ring. Although water in molecular sieve is not fatal, but will lead to molecular sieve adsorption "load" increase the above indicators of carbon molecular sieve manufacturers are expressed in the factory, but only as a reference data, how to maximize the performance of carbon molecular sieve, which PSA nitrogen generator, each manufacturer's process and adsorption tower height diameter ratio has a direct relationship. That is, it affects its ability to absorb O 2, CO 2, so the compressed air drying to remove water is to improve the adsorption capacity and stability of the molecular sieve can not be ignored.