制氮機提取氮氣的技術(shù)原理你知道嗎？

制氮機的變壓吸附技術(shù)是一種的氣體分離技術(shù)。

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

其提取氮氣主要原理是：由于空氣中氧、氮兩種氣體分子在碳分子篩表面微孔的擴散速率不同，直徑較小的氧分子擴散較快，較多的進入分子篩固相(微孔)，直徑較大的氮分子擴散較慢，進入分子篩固相(微孔)也較小，這樣，在氣相中就得到氮的富集成份；在吸附平衡情況下，空氣壓力越高，則碳分子篩的吸附量越大；反之壓力越低，則吸附量越小。

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.

投入工業(yè)運行的PSA空分制氮裝置一般具有二個或二個以上吸附器組成，各吸附器通過優(yōu)化縱使，交替循環(huán)工作，以達到連續(xù)產(chǎn)氮和提高氮氣回收率等目的。

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.

經(jīng)過凈化干燥的壓縮空氣，制氮機利用碳分子篩對壓縮空氣中氧氮的選擇吸附性，運用動力學(xué)效應(yīng)，氧在碳分子篩微孔中擴散速率大于氮，在吸附未達到平衡時，氮在氣相中被富集起來，形成成品氮氣，然后經(jīng)減壓至常壓，吸附劑脫附的氧氣等雜質(zhì)，實現(xiàn)再生，一般在系統(tǒng)中設(shè)置兩個吸附塔，一塔吸附產(chǎn)生氮，另一塔脫附再生，通過PLC程序控制氣動閥的啟閉，使兩塔交替循環(huán)，以實現(xiàn)連續(xù)生產(chǎn)高品質(zhì)氮氣，也可以間接生產(chǎn)，啟動和調(diào)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.

制氮裝置所需要的主要氣源是達到要求的壓縮空氣，不需要專人控制，便可以源源不斷地生產(chǎn)出高品質(zhì)和高純度的氮氣，運行穩(wěn)定可靠，成本低，比購買鋼瓶氮氣或液氮氣費用低廉好多倍。

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.