Home >> Industry Knowledge >> Carbon molecular sieve composition of Nitrogen Generator

N2 in a very wide distribution in nature is the main component of air, the main element in the form of molecular nitrogen in the atmosphere. In dry air, N2 air volume accounted for 78.03%, the nitrogen from the air is the largest system of raw materials base, it inexhaustible.
Oxygen and nitrogen in air separation, the general use of cryogenic air separation method, but the cryogenic air separation plant (commonly known as oxygen) complex, investment costs, and safety factors low, the need for skilled operators, and often need to drive 10 hour or so in order to produce qualified products nitrogen.

Principle and Process

CMS (Carbon Molecular Sieving - CMS) is a coal as the main raw material derived from specially processed, black surface of a porous particle, is a semi-permanent adsorbent (the use of renewable sources). Its oxygen and nitrogen is mainly based on the separation of these two gases in carbon molecular sieve on the surface of different proliferation rate, the smaller the diameter of gas molecules (O2) the proliferation of faster, more solid phase into the zeolite (microporous), more large-diameter of gas molecules (N2) the proliferation of slow access to solid-phase low molecular sieve, so that gas can be nitrogen-rich ingredients.
Therefore the use of carbon molecular sieve for oxygen and nitrogen adsorption at a certain time difference between the amount of this property, by the microcomputer in accordance with specific procedures, combined with pressure adsorption, desorption rapid decompression cycle (PSA), the completion of oxygen and nitrogen separated from the gas obtained in high purity nitrogen.
The seventies the development of a new type of foreign nitrogen technology, namely the use of carbon molecular sieve pressure swing adsorption air separation method of preparation of nitrogen, it has the following advantages:
⑴ component structure, composite bed design, atmospheric pressure desorption process, the scene only to provide a certain amount of water, electricity. Process is simple, small footprint, low investment.
⑵ simple to use with the open with.
Purity adjustment ⑶ convenient, low-cost nitrogen (nitrogen products and product volume is inversely proportional to the relationship between the purity of nitrogen, according to the needs of the flexible adjustment).
The scope of application of
⑴ chemical industry: the protection of inert atmosphere.
⑵ metal heat treatment: mechanical and metallurgical industry of the bright annealing, bright quenching, in addition to stress, carburizing, carbonitriding, brazing, powder metallurgy sintering furnace, as well as the safety of handling such as washing.
⑶ electronics industry: the production of semiconductor and electrical components of the nitrogen.
⑷ petroleum refining industry: all kinds of storage tanks, containers, towers and pipes Catalytic Nitrogen purification; oil storage and transportation of Nitrogen protection.
⑸ Plastic Industry: Plastic particles in pneumatic transport, when the plastic Production and Stockpiling of Anti-oxidation.
⑹ the pharmaceutical industry: tanks and containers Nitrogen oxide emission, pneumatic transfer the production of drug materials and other applications.
⑺ rubber industry: rubber packaging and preservation, tire production.
⑻ food industry: meat, cheese and other food packaging Nitrogen, fruits, food preservation.
⑼ offshore platforms: tank and vessel inerting, gas cover, exhaust pipe.


The working principle of the components
    (1) air-source raw materials:
Raw air (atmosphere), after oil-free air compressor lubrication (with oil-lubricated air compressor) to achieve compression pressure setting (0.6 - 1.0MPa around). Air Station, if off-the-shelf supply may be used.
    (2) gas pretreatment system:
Lubrication oil-free compressed air compressor gas cooler backward by gas-liquid separator, where liquid-gas separation carried out, after further drying desiccant drying system, in order to be pure dry compressed air. If the configuration of the compressor is compressor oil, oil remover should be used to replace high-performance gas-liquid separator. Drying system is composed of two absorption tower, a work, a renewable, compressed air from the bottom of the valve into the compressed air of CO2, H2O, such as by internal molecular sieve adsorption, pure outflow from the top of the compression air. After 5 minutes the conversions through the valve to the molecular sieve adsorption after regeneration.
(3) the separation of oxygen and nitrogen components:
Adsorption of carbon molecular sieve with a total of two towers, after treated by the adsorption tower of the compressed air valve at the bottom of import, as when carbon molecular sieve, O2 by their adsorption, gas outlet out of N2, when a tower adsorption, another in the regeneration tower, the so-called renewable sources that is the end of adsorption, the rapid step-down will be from within the O2 from the carbon molecular sieve within out into the atmosphere. Under the control of the computer take turns working the two towers to complete the separation of oxygen and nitrogen, continuous output of nitrogen.

Nitrogen Generator sets of units, generally the following components:
(1) air compressor (with cooler)
(2) gas-liquid separator (high efficiency oil remover)
(3) drying system
(4) Adsorption and Separation of components (carbon molecular sieve, valve)
(5) nitrogen tank
(6) flow testing instruments
(7) electrical control system (including the purity of detection, computer, etc.)

Matching requirements

1. Compressed Air Source: Compressed Air is the raw material for nitrogen, whether it is off-the-shelf package or Air compressor station, compressed air must be free of oil, water, dust-free, in line with a certain degree of pressure, a certain flow.
2. Power: AC compressor is generally three-phase, electrical control system including instrumentation for single-phase AC power.
3. Cooling water: a certain amount of pressure and room temperature cooling water softener.