What is the carbon molecular sieve used in the nitrogen machine?

Chinese name: carbon molecular sieve

Name: carbonaceous molecular sieve

Definition: A porous carbon-containing substance with molecular pore size made from coal or organic compounds.

Carbon Molecular sieve is a new adsorbent developed in the 1970s, is an excellent non-polar carbon material, nitrogen Carbon Molecular Sieves (CMS) used to separate air enrichment nitrogen, using room temperature low pressure nitrogen process, than the traditional cryogenic high pressure nitrogen process has less investment costs. Nitrogen production speed, low cost of nitrogen advantages. Therefore, it is currently the engineering industry's preferred pressure swing adsorption (referred to as P.S.A) air separation nitrogen rich adsorbent, this nitrogen is widely used in the chemical industry, oil and gas industry, electronics industry, food industry, coal industry, pharmaceutical industry, cable industry, metal heat treatment, transportation and storage.

Nitrogen making machine is based on the principle of pressure swing adsorption, using high-quality carbon molecular sieve as adsorbent, under a certain pressure, from the air to produce nitrogen. After purifying and drying compressed air, pressure adsorption and decompression desorption are carried out in the adsorber. Due to the aerodynamic effect, the diffusion rate of oxygen in the micropores of carbon molecular sieve is much higher than that of nitrogen, oxygen is preferentially adsorbed by carbon molecular sieve, and nitrogen is enriched in the gas phase to form finished nitrogen. Then by reducing pressure to normal pressure, the adsorbent desorbs the adsorbed oxygen and other impurities to achieve regeneration. Generally, two adsorption towers are set up in the system, one tower adsorbed nitrogen, the other tower desorption regeneration, through the PLC program controller to control the opening and closing of the pneumatic valve, so that the two towers alternate circulation, in order to achieve the purpose of continuous production of high-quality nitrogen. The whole system consists of the following components: compressed air purification assembly, air storage tank, oxygen and nitrogen separation device, nitrogen buffer tank.

1, compressed air purification module

The compressed air provided by the air compressor is first passed into the compressed air purification component, and the compressed air is first removed by the pipeline filter most of the oil, water and dust, and then further removed by the freeze dryer, the fine filter for oil removal and dust removal, and the ultra-fine filter is followed by deep purification. According to the system working conditions, Chenrui Air separation gas specially designed a set of compressed air degreaser, which is used to prevent possible trace oil penetration and provide full protection for carbon molecular sieve. Carefully designed air purification components ensure the service life of carbon molecular sieve. Clean air treated by this assembly can be used for instrument air.

2. Air storage tank

The role of the air storage tank is: reduce the airflow pulsation, play a buffer role; Thus, the pressure fluctuation of the system is reduced, so that the compressed air passes smoothly through the compressed air purification component, so as 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 adsorption tower is switched, it also provides a large amount of compressed air for the PSA oxygen and nitrogen separation device to rapidly increase the pressure in a short time, so that the pressure in the adsorption tower quickly rises to the working pressure, ensuring the reliable and stable operation of the equipment.

3, oxygen and nitrogen separation device

The adsorption tower equipped with special carbon molecular sieve has A and B two. When the clean compressed air enters the inlet end of tower A and flows through the carbon molecular sieve to the outlet end, O2, CO2 and H2O are adsorbed by it, and the product nitrogen flows out from the outlet end of the adsorption tower. After A period of time, the carbon molecular sieve in Tower A is saturated by adsorption. At this time, tower A automatically stops adsorption, compressed air flows into Tower B for oxygen absorption and nitrogen production, and the molecular sieve of Tower A is regenerated. The regeneration of molecular sieve is achieved by rapidly dropping the adsorption tower to atmospheric pressure to remove the adsorbed O2, CO2 and H2O. The two towers are alternately adsorbed and regenerated to complete the separation of oxygen and nitrogen and the continuous output of nitrogen. The above processes are controlled by a programmable logic controller (PLC). When the purity of nitrogen at the outlet end is set, the PLC program functions, the automatic vent valve is opened, and the unqualified nitrogen is automatically emptied to ensure that the unqualified nitrogen does not flow to the gas point. When the gas is discharged, the noise is less than 75dBA by using a silencer.

4. Nitrogen buffer tank

The nitrogen buffer tank is used to balance the pressure and purity of the nitrogen separated from the nitrogen oxygen separation system to ensure the stability of the continuous supply of nitrogen. At the same time, after the work of the adsorption tower is switched, it will fill part of its own gas back to the adsorption tower, on the one hand to help the adsorption tower pressure, but also play a role in protecting the bed, and play a very important process assistance role in the working process of the equipment.

Nitrogen machine application scope:

Protective gas for metal heat treatment process, chemical industry production gas and all kinds of storage tanks, pipelines filled with nitrogen purification, rubber, plastic products production gas, food industry oxygen preservation packaging, beverage industry purification and covering gas, pharmaceutical industry filled with nitrogen packaging and containers filled with nitrogen and oxygen, electronic industry electronic components and semiconductor production process protection gas. Purity, flow, pressure stable and adjustable to meet the needs of different customers.

Technical index

Nitrogen output: 3-1000Nm/h Nitrogen purity: 95%-99.9995%

Dew point: ≤-40℃(under normal pressure) Nitrogen pressure: ≤0.6Mpa(adjustable)

Technical characteristics

1. Reasonable internal components, uniform distribution of air flow, reduce high-speed impact of air flow.

2. Perfect process design and optimal use effect.

3. Unique molecular sieve protection measures to extend the service life of carbon molecular sieve.

4. Intelligent interlock unqualified nitrogen emptying device to ensure product nitrogen quality.

5. Optional nitrogen device flow, purity automatic adjustment system, remote control system.

6. Simple operation, stable operation, high degree of automation, can achieve unmanned operation.