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What are the factors that determine the stability of the nitrogen generator?

2019-05-05 15:55 admin

At present, the use of nitrogen is very wide. On-site nitrogen production is the best choice for many enterprises, and the use of nitrogen generators is more and more extensive. Therefore, the stability of nitrogen generators is of concern to many companies!

宏博净化:决定制氮机稳定性能的因素有哪些?

Nitrogen generator is a high-tech product that involves machine, electricity and instrumentation. It is especially important for the stability of equipment during long-term use. We know from the composition of the nitrogen generator that the stability of the impact is mainly the two factors of controlling the valve and the carbon molecular sieve. We will talk about these two points in detail.

First, the control valve:
1. Pressure swing adsorption nitrogen generator, the performance that the valve must have
1). The material performance is good, absolutely not leaking;
2). Complete the opening or closing action within 0.02 seconds of receiving the control signal;
3). Can withstand frequent opening and closing, to ensure a long enough service life;
2. The root cause of valve failure
Under normal use conditions, each program-controlled valve must be switched once every cycle (about 120 seconds). According to the nitrogen generator, 300 working days per year, 24 hours a day, the adsorption and desorption cycles are 4 minutes. Then each valve needs to be opened and closed more than 200,000 times a year. As long as one of the valves fails, the entire device will be affected. Therefore, the continuous service life of the valve is the most important part of the stability and reliability of the nitrogen generator.

Second, the carbon molecular sieve is the core of the variable pressure nitrogen generator:
1. Carbon molecular sieve performance indicators:
1) Hardness 2) Nitrogen production (Nm3/T-h) 3) Recovery rate (N2/Air)% 4) Filling density
The above indicators of carbon molecular sieve manufacturers have been specified at the factory, but can only be used as reference data, how to maximize the performance of carbon molecular sieves, which has a direct relationship with the process of each nitrogen generator manufacturer and the height-diameter ratio of the adsorption tower At the same time, it is very important to ensure the service life of the molecular sieve.
2. The effect of oil and water on molecular sieves in air:
Since the air contains a certain amount of water and oil vapor, after passing through the compressor, if it is not subjected to strict air purification treatment, the oil vapor is easily adsorbed by the carbon molecular sieve, and it is difficult to desorb, and the pore size of the molecular sieve is filled, resulting in failure of the molecular sieve "poisoning". Therefore, setting a strict air purification device before the compressed air enters the adsorption tower is an essential part to ensure the service life of the molecular sieve. Although water is not fatal to molecular sieves, it will increase the adsorption “load” of molecular sieves, which affects its ability to adsorb O2 and CO2. Therefore, drying air to remove water is a problem that can not be ignored for improving the adsorption capacity and stability of molecular sieves.
3. Carbon molecular sieve filling technology:
When the carbon molecular sieve is loaded into the adsorption tower, it must have a special filling technology. Otherwise, it is easy to be pulverized and cause failure. From the process flow, we can find that when the compressed air enters the bottom of the adsorption tower at a high speed, if there is no special gas distributor, Molecular sieves are strongly impacted and rubbed by the gas stream, which easily causes the molecular sieve to be pulverized. In addition, it is impossible to absolutely close the molecular sieve into the adsorption tower. After using the nitrogen generator for a period of time, the gap between the molecular sieves is reduced and slowly sinks. If there is no molecular sieve automatic filling device and compacting device, the upper part of the adsorption tower There will be obvious space. When the compressed air enters the lower part of the adsorption tower, the molecular sieve will rapidly displace in a short time under the impact force of the airflow, causing the molecular sieves to collide with each other, rubbing and colliding with the adsorption tower wall, thus easily pulverizing the molecular sieve. Invalid.