In the era of rapid development of the market economy, the purchase of product choice space is relatively large, but we can really buy very satisfactory products, not many, today I will introduce you, choose to buy nitrogen machine equipment attention is what?

First, the nitrogen machine is compared and analyzed from the following aspects:

a) The rationality of the entire system design;

b) carbon molecular sieve filling technology and compaction method;

c) Control valve service life;

d) Research and development, manufacturing experience, user performance;

Second, the factors affecting the cost of nitrogen machine:

1) One-time investment for the entire system;

2) Service life of molecular sieve;

3) Life and cost of parts required during use;

4) Operation and maintenance, maintenance costs and electricity, water, compressed air consumption;

Third, the factors affecting the stability of the nitrogen machine:

Nitrogen making machine is a high-tech product involving machine, electricity and instrument, and the stability of the equipment is especially important in long-term use. It is not difficult to see from the composition of the nitrogen machine that the stability is affected by the following two points:

1. Control valve:

For the pressure swing adsorption nitrogen machine, the valve must have the following properties:

a) Good material performance, absolutely no air leakage;

b) Complete the on or off action within 0.02 seconds of receiving the control signal;

c) can withstand frequent opening and closing to ensure long enough service life;

1.1. Root cause of valve failure

Under normal conditions of use, each programmed valve in each cycle (about 120 seconds) must be switched on and off once, according to the nitrogen machine 300 working days a year, 24 hours a day continuous movement, adsorption and desorption cycle of 4 minutes, then each valve needs to open and close more than 200,000 times a year. The failure of just one valve will affect the normal operation of the entire equipment. Therefore, the continuous service life of the valve is the most important part of the stability and reliability of the nitrogen machine.

2, carbon molecular sieve is the core of the transformer nitrogen machine:

2.1, carbon molecular sieve performance indicators:

a. Hardness

b. Nitrogen production (Nm3/T-h)

c. Recovery rate (N2/Air)%

d. Packing density

The above indicators carbon molecular sieve manufacturers have been indicated at the factory, but can only be used as reference data, how to make the carbon molecular sieve play the maximum efficiency, which has a direct relationship with the process of each nitrogen manufacturer and the adsorption tower height diameter ratio, while ensuring the service life of the molecular sieve is very particular:

2.2. Carbon molecular sieve filling technology:

Carbon molecular sieve into the adsorption tower must have a special filling technology, otherwise it is easy to powder and lead to failure, from the process process we can find that when the compressed air enters from the bottom of the adsorption tower at high speed, if there is no special gas distributor, the molecular sieve is subject to the strong impact of the air flow, friction, easy to cause the powder of the molecular sieve. In addition, it is impossible to fill the molecular sieve into the adsorption tower is absolutely tight, after a period of use, the gap between the molecular sieve is decreasing, slowly sinking, if there is no molecular sieve automatic filling device and compression device, there will be obvious space in the upper part of the adsorption tower. When the compressed air enters the lower part of the adsorption tower, the molecular sieve will have a rapid displacement in a short time under the impact force of the air flow, resulting in molecular sieve collision with each other, friction and impact with the adsorption tower wall, which is easy to make the molecular sieve powder failure.

2.3. The effect of oil and water in the air on molecular sieve:

Because the air contains a certain amount of water and oil vapor, after the compressor, if not strictly air purification treatment, oil vapor is easy to be adsorbed by carbon molecular sieve, and difficult to desorption, stuffing the molecular sieve pore size, resulting in molecular sieve "poisoning" failure. Therefore, setting up a strict air purification device before the compressed air enters the adsorption tower is an essential part of ensuring the service life of the molecular sieve. Although water is not fatal to molecular sieve, it will increase the adsorption "load" of molecular sieve, that is, affect its ability to adsorb O2 and CO2, so compressed air drying water removal is a problem that can not be ignored to improve the adsorption capacity and stability of molecular sieve.

3. Program analysis

In view of the above problems, SAP has made special research and development, for this purpose, the complete nitrogen system has been carefully designed and arranged, and the complete nitrogen production device contains the following parts.

3.1 System Flow Chart

3.1.1 Air compressor

The air compressor is the main part of the air supply, and the compressed air is first passed into the compressed air purification component to remove water and oil, and then into the air purification component

3.1.2 Air purification device

The air purification component is composed of high efficiency filter, freeze dryer, fine filter, super fine filter, catalyst oil separator, etc., compressed air enters the pipeline filter to remove >1μm particles and most of the water, to ensure the normal use of the freeze dryer and the filter after the freeze dryer to force cooling to about 5℃, so that the water vapor in the air condenses into water. After separating and filtering through the water filter, it is discharged by the sewage valve, so that the dew point of the compressed air reaches -10℃, and the fine filter filters the particles and oil and water >0.01μm, and then enters the super-fine filter to filter the oil and water; Filtration accuracy >0.001μm, after the active carbon in the oil remover adsorption residual trace oil mist, get clean compressed air through the pipeline into the nitrogen oxygen separation system, to ensure the longevity of molecular use.

3.1.3 Air storage tank components

The function of the air storage tank is to ensure the smooth use of gas in the system, reduce the airflow pulsation, play a buffer role, so as to reduce the pressure fluctuation of the system, so that the compressed air passes smoothly through the compressed air purification system, in order to fully remove the oil and water impurities, and reduce the load of the subsequent PSA oxygen and nitrogen separation device. At the same time, when the oxygen and nitrogen separation system performs periodic work switching, it also provides a large amount of compressed air required for rapid pressure increase in a short time for the oxygen and nitrogen separation system, so that the adsorption pressure in the adsorption tower quickly rises to the working pressure, ensuring the stable operation of the equipment.

3.1.4 Oxygen and nitrogen separation system

Oxygen and nitrogen separation system is the core part of the nitrogen machine, by two adsorption tower, compression device, program control valve, and other components, our hospital adopts high-quality imported valves, no leakage service life of more than 3 million times, for the whole device provides a reliable performance guarantee.

3.1.5 Nitrogen buffer tank

Nitrogen buffer tank is mainly composed of buffer tank, dust filter, flow meter, pressure regulator, throttle valve, etc., to provide a stable nitrogen source on site. Summary: Through the above analysis of the scheme, we can have a certain understanding and understanding of the structure and composition of the nitrogen machine, but for different environmental conditions and different process conditions, the equipment will have a certain selectivity in the configuration.

In the face of the uneven nitrogen machine equipment on the market, how do consumers polish their eyes and buy cost-effective equipment, I believe this is a very nerve-wracking problem for many consumers, personally feel that they still choose some relatively large brand businesses, one is that we can buy rest assured, the second is that after-sales service is also guaranteed; Even if there are problems in the process of our use, we also know how to protect our legitimate rights and interests, and there will be no complaints. Of course, this is just my personal opinion, or different people have different opinions, but our ultimate goal is the same.