1. It is very necessary for the pure raw material air to enter the carbon molecular sieve adsorption tower during the air compression purification process, because particles and organic gases entering the adsorption tower will block the micropores of the carbon molecular sieve and gradually reduce the separation performance of the carbon molecular sieve.
The methods of purifying raw air include: (1), keep the air inlet of the air compressor away from places with oil mist and organic gas; (2), pass through a cold dryer, an adsorbent purification system, etc. Raw material air enters the carbon molecular sieve adsorption tower.
2. Concentration and gas production of nitrogen gas produced by carbon molecular sieve, its N2 concentration and gas production can be adjusted arbitrarily according to the needs of users. When the gas production time and operating pressure are determined, lower the gas production, and the N2 concentration will increase. On the contrary, the N2 concentration decreases. Users can adjust according to actual needs.
3. During the pressure equalization time carbon molecular sieve nitrogen production process, when the adsorption of one adsorption tower is completed, the pressurized gas in this adsorption tower can be injected into another regenerated adsorption tower from the upper and lower directions, and the gas in the two towers will The pressure is the same, and this process is called the pressure equalization of the adsorption tower. Choosing an appropriate pressure equalization time can recover energy and slow down the impact of the molecular sieve in the adsorption tower, thereby prolonging the service life of the carbon molecular sieve. The switching speed of the reference valve generally selects the pressure equalization time as 1-3 seconds.
4. Gas production time is different according to the absorption and diffusion rate of carbon molecular sieves to oxygen and nitrogen. The adsorption of O2 reaches equilibrium in a short time. At this time, the adsorption amount of N2 is very small, and the short gas production time can effectively improve The gas production rate of carbon molecular sieves increases, but at the same time it also increases the operating frequency of the valve, so the performance of the valve is also very important. Generally, the adsorption time is selected to be 30-120 seconds. A short gas production time is recommended for small high-purity nitrogen generators, and a long gas production time is recommended for large-scale low-concentration nitrogen generators.
5. Operating pressure Carbon molecular sieves have a balance adsorption effect while having a dynamic effect. The partial pressure of the adsorbate is high and the adsorption capacity is also high. Therefore, the adsorption by the pressurizer is beneficial, but the adsorption pressure is too high, which is harmful to the air compressor. Modeling requirements are also increased. In addition, the two processes of normal pressure regeneration and vacuum regeneration have different requirements for adsorption pressure. Considering various factors, it is recommended that the adsorption pressure of normal pressure regeneration process be selected as 5-8kg/cm2; It is advisable to select the pressure as 3-5Kg/cm2.
6. Use temperature as the adsorbent. Selecting a lower adsorption temperature is beneficial to the performance of carbon molecular sieves. It is beneficial to lower the adsorption temperature when conditions permit for the nitrogen generator process.
