Pressure swing adsorption (PSA) oxygen generation principle and advantages

　　A device that uses physical methods to separate oxygen from the air to obtain oxygen is called an oxygen generator. Oxygen generators are mainly divided into three types: cryogenic air separation, molecular sieve air separation (PSA), and membrane air separation. Let's learn more aboutPressure Swing Adsorption Air Separation Equipmentthe oxygen production principle and its advantages!

　　Pressure swing adsorption (PSA) air separation equipment adsorbs at high pressure. This method is based on the selective adsorption separation of oxygen and nitrogen components in the air by molecular sieves to obtain oxygen. Gas separation is achieved, and the adsorbent is regenerated at low pressure. Oxygen molecules remain in the gas phase and become oxygen. The adsorption capacity of the molecular sieve is restored. For continuous oxygen supply, the air is compressed, and when passing through the adsorption tower equipped with molecular sieves, nitrogen molecules are preferentially adsorbed. When adsorption reaches equilibrium, the nitrogen molecules adsorbed on the surface of the molecular sieve are removed by depressurization or vacuuming. The device usually has two or more adsorption towers, one tower adsorbs oxygen, and the other tower desorbs to achieve the purpose of continuous oxygen production.

　　Pressure Swing Adsorption Air Separation EquipmentIt can produce oxygen with a purity of 80%~95%, generally 30kPa~100kPa. The process is simple, and in the vacuum desorption process, the operating pressure of the device is low, and the containers are not controlled by pressure vessel regulations. The oxygen production power consumption is generally 0.32kWh/Nm3~0.37kWh/Nm3, and the adsorption pressure is higher than atmospheric pressure.

　　When the air pressure rises, the carbon molecular sieve will adsorb a large amount of oxygen, carbon dioxide, and water. When the pressure is reduced to normal pressure, the adsorption capacity of the carbon molecular sieve for oxygen, carbon dioxide, and water becomes very small.

　　The pressure swing adsorption air separation equipment mainly consists of two adsorption towers equipped with carbon molecular sieves a and b and a control system. After the nitrogen passes through, it flows out from the top of the tower. At the same time, the molecular sieve in tower a is regenerated. When compressed air (pressure is usually 0.8MPa) passes from bottom to top through tower a, oxygen, carbon dioxide, and water are adsorbed by the carbon molecular sieve. When the molecular sieve in tower a is saturated, it switches to tower b for the above adsorption process. PSA nitrogen generation technology is a high-tech technology that directly produces nitrogen from air at room temperature, causing the pressure to quickly drop to normal pressure, which is the process of releasing oxygen, carbon dioxide, and water adsorbed by the molecular sieve from the molecular sieve. Regeneration refers to the process of discharging the gas in the adsorption tower into the atmosphere, after decades of application.

　　Pressure Swing Adsorption Air Separation EquipmentIt has the following advantages: reduce the air volume of the blower, extend the service life of the equipment, firstly, it adopts the atmospheric intake pressure difference automatic feeding technology to reduce the cost of oxygen production. Secondly, the equipment is simple, the main equipment is the Roots blower and vacuum pump, which runs stably and reliably, the molecular sieve has a service life of more than 10 years, and no maintenance is required. Third, the amount of oxygen produced and the purity can be adjusted according to the actual use, the stable purity is 93%, and the economic purity is 80%~90%; the oxygen production time is fast. Fourth, compared with cryogenic oxygen production, pressure swing adsorption oxygen production has the following characteristics: it usually takes less than 30 minutes to reach a purity of more than 80%, and the unit power consumption is only 0.32kWh/Nm3~0.37kWh/Nm3, which can basically meet the requirements of unmanned management of the high-furnace enriched oxygen air supply process. Low investment, simple process, small land occupation, few equipment, few moving parts; high degree of automation.

　　The above is an introduction toPressure Swing Adsorption Air Separation Equipmentthe principle and advantages of oxygen production. If you need to know more, please Contact Us!