制氮机提取氮气的技术原理你知道吗？

制氮机的变压吸附技术是一种的气体分离技术。

Pressure swing adsorption technology of nitrogen generator is a kind of gas separation technology.

其提取氮气主要原理是：由于空气中氧、氮两种气体分子在碳分子筛表面微孔的扩散速率不同，直径较小的氧分子扩散较快，较多的进入分子筛固相(微孔)，直径较大的氮分子扩散较慢，进入分子筛固相(微孔)也较小，这样，在气相中就得到氮的富集成份；在吸附平衡情况下，空气压力越高，则碳分子筛的吸附量越大；反之压力越低，则吸附量越小。

The main principle of nitrogen extraction is as follows: due to the different diffusion rates of oxygen and nitrogen gas molecules in the surface micropores of carbon molecular sieve, oxygen molecules with smaller diameter diffuse faster, and more nitrogen molecules with larger diameter diffuse slowly and enter molecular sieve solid phase (micropores), so as to obtain nitrogen enriched components in the gas phase; in the adsorption process, oxygen molecules with small diameter diffuse faster, and more nitrogen molecules enter molecular sieve solid phase (micropores) On the contrary, the lower the pressure, the smaller the adsorption capacity.

投入工业运行的PSA空分制氮装置一般具有二个或二个以上吸附器组成，各吸附器通过优化纵使，交替循环工作，以达到连续产氮和提高氮气回收率等目的。

The PSA air separation nitrogen plant which has been put into industrial operation generally consists of two or more adsorbers. Each adsorber works alternately through optimization to achieve continuous nitrogen production and improve nitrogen recovery.

经过净化干燥的压缩空气，制氮机利用碳分子筛对压缩空气中氧氮的选择吸附性，运用动力学效应，氧在碳分子筛微孔中扩散速率大于氮，在吸附未达到平衡时，氮在气相中被富集起来，形成成品氮气，然后经减压常压，吸附剂脱附的氧气等杂质，实现再生，一般在系统中设置两个吸附塔，一塔吸附产生氮，另一塔脱附再生，通过PLC程序控制气动阀的启闭，使两塔交替循环，以实现连续生产高品质氮气，也可以间接生产，启动和调整很快。

After purification and drying of compressed air, the nitrogen generator uses the selective adsorption of oxygen and nitrogen in the compressed air by carbon molecular sieve. The diffusion rate of oxygen in the micropores of carbon molecular sieve is greater than that of nitrogen. When the adsorption does not reach equilibrium, nitrogen is enriched in the gas phase to form finished nitrogen. Then it is reduced to atmospheric pressure, and the impurities such as oxygen desorbed by adsorbent realize regeneration Generally, two adsorption towers are set up in the system. One tower absorbs nitrogen and the other tower desorbs and regenerates. The opening and closing of pneumatic valves are controlled by PLC program to make the two towers circulate alternately, so as to realize continuous production of high-quality nitrogen. Indirect production can also be realized, and the start-up and adjustment are very fast.

制氮装置所需要的主要气源是达到要求的压缩空气，不需要专人控制，便可以源源不断地生产出高品质和高纯度的氮气，运行稳定可靠，成本低，比购买钢瓶氮气或液氮气费用低廉好多倍。

The main gas source required by the nitrogen generation device is compressed air which meets the requirements. Without the control of special personnel, it can continuously produce high-quality and high-purity nitrogen. It is stable and reliable, and has low cost, which is many times lower than the cost of purchasing cylinder nitrogen or liquid nitrogen.