|Current Products: Nitrogen Generators, Nitrogen Generators, Small Nitrogen Generators, Nitrogen Generators, Nitrogen Generators ()|
Type: Nitrogen generator Type of extracted gas: Nitrogen Extracted gas state: Liquid Application areas: chemical, petroleum, food
Brand: Hongshuo Principle of operation: Compression Model: HSFD99% -5Nm3 / h Dimensions: 1500 * 1600 * 2100 (mm) (mm)
Weight: 700 (kg) Processing capacity: 5 (m3 / h)
Pressure swing adsorption air separation oxygen production (referred to as PSA oxygen production) is an advanced gas separation technology. High-quality imported oxygen molecular sieve (CMS) is used as the adsorbent, and the pressure swing adsorption principle (PSA) is used to separate air at room temperature. The purity is 50% -95% oxygen.
Oxygen and nitrogen gas molecules have different diffusion rates on the surface of the molecular sieve. Gas molecules (O2) with smaller diameters diffuse faster, and more enter the pores of carbon molecular sieve. Slower, less micropores into the lithium molecular sieve. The difference in selective adsorption of nitrogen and oxygen by lithium molecular sieves leads to nitrogen enrichment in the adsorption phase and oxygen enrichment in the gas phase in a short time, so that the oxygen and nitrogen are separated, and the gas phase enrichment oxygen is obtained under PSA conditions.
Differential curves of the adsorption capacity of lithium molecular sieve for oxygen and nitrogen at different times under different pressures:
After a period of time, the molecular sieve's adsorption of nitrogen reached equilibrium. According to the different characteristics of the adsorption capacity of the lithium molecular sieve for the adsorption gas under different pressures, reducing the pressure causes the lithium molecular sieve to release the adsorption of nitrogen. According to the regeneration pressure, it can be divided into vacuum regeneration and normal pressure regeneration. Atmospheric regeneration is conducive to the thorough regeneration of molecular sieves and easy to obtain high-purity gas.
PSA oxygen generator (referred to as PSA oxygen generator) is an oxygen generating equipment designed and manufactured according to PSA technology. Generally, two adsorption towers are used in parallel, and a fully automatic control system strictly controls the sequence according to a specific programmable sequence, and alternately performs pressure adsorption and decompression regeneration to complete the separation of oxygen and nitrogen to obtain oxygen of the required purity.
The dynamic adsorption capacity and performance of the separation coefficient of lithium molecular sieve (CMS) determine the quality of the oxygen generator.
Chapter III Equipment Features
Features of PSA oxygen generator
◆ Easy installation:
The equipment has a compact structure and is skid-mounted as a whole.
◆ More economical than other oxygen supply methods
The PSA process is a simple oxygen production method. It uses air as a raw material and consumes only energy consumed by the air compressor. It has the advantages of low operating costs, low energy consumption, and high efficiency.
◆ Integrated design of mechatronics and instrumentation for automatic operation
Imported PLC controls fully automatic operation. The oxygen flow pressure and pressure purity can be adjusted and continuously displayed. The pressure, flow, and purity alarms can be set and remote automatic control and detection and metering can be realized to achieve truly unmanned operation. The advanced control system makes the operation easier, thereby ensuring the stability of gas purity and flow.
◆ High-quality components are a guarantee of stable and reliable operation
Pneumatic valve, electromagnetic pilot valve and other key components adopt imported configuration, reliable operation, fast switching speed, service life of more than one million times, low failure rate, convenient maintenance and low maintenance costs.
◆ Continuous display of oxygen content and automatic alarm system for exceeding limit:
Monitor oxygen purity online to ensure the required oxygen purity is stable.
◆ High-quality lithium molecular sieve:
It has large adsorption capacity, high compression resistance and long service life. The normal service life can reach 7 to 8 years.
◆ Advanced loading technology guarantees the service life of the equipment
The carbon molecular sieve is packed by the "blizzard" method, which makes the molecular sieve distributed evenly without dead corners and difficult to powder. Lithium molecular sieve adsorption performance and compacted state are guaranteed to effectively extend the life of lithium molecular sieve.
◆ Differential pressure indication and centralized sewage discharge:
Each stage of the filter is equipped with a differential pressure indicator and a centralized automatic sewage system.
◆ Ideal Purity Selection Range:
The oxygen purity is easy to adjust, and can be adjusted arbitrarily between 50% -99% according to user needs.
◆ System's unique cycle switching process:
Reduced valve wear, extended equipment life and reduced maintenance costs.
◆ Free debugging and lifetime maintenance:
Strong technical strength and high quality after-sales service, provide continuous technical support, so that users have no worries about their use.
Chapter 4 System Process Description
This protective gas station system is composed of compressed air device, compressed air purification device, pressure swing adsorption oxygen generation device, and other equipment.
First, the compressed air system
The compressed air system consists of a screw compressor and an air buffer tank, and provides the air source required for the pressure swing adsorption nitrogen production device. This system provides stable output pressure and sufficient air volume. The air compressor is a screw air compressor with reliable operation, simple maintenance, low noise and no basic operation. The air buffer tank is mainly used as a buffer for the air source, which plays a role of stabilization and storage. In addition, it can also collect and remove most of the oil-water condensate entering the compressed air source. The buffer tank is equipped with a pressure gauge, a safety valve, and a drain port.
The exhaust capacity of the air compressor is slightly larger than the air consumption under the rated output of the nitrogen generator. Because its start and stop are controlled by the exhaust pressure, when the exhaust volume is greater than the air consumption, the discharge pressure increases and the air compressor is unloaded; Air compressor loading. Through this cycle of start and stop, the air compressor's exhaust capacity is adapted to the nitrogen generator's gas consumption requirements, and it is adapted to the production line's operating needs under variable operating conditions (below the rated output).
Air purification system
The compressed air from the buffer tank first enters the C-class filter for rough filtration, and then enters the refrigerated dryer to force the compressed air to cool down, condenses the water vapor in the air, and the condensed liquid water is entrained with dust and oil and discharged outside the machine . The dryer is best placed in the compressor room. The process uses a freeze dryer to remove oil and water, based on three reasons:
1. The maximum liquid load at the air inlet of the rear stage T-stage air supply line filter: 2000ppm w / w dew point <-12 ¡ã C. Without the use of a freeze dryer, the T-stage air supply line filter is liable to fail;
2. The outdoor temperature is relatively low in winter. When the temperature of compressed air decreases, moisture will precipitate and block the pipeline system. The pipeline system must be tilted and drained.
3. The piping system is easy to corrode and rust after the water is precipitated.
The rear precision filter set of the cold dryer is composed of a secondary filter. They are T-level main line filters and A-level high-efficiency degreasing mist filters. The precision of the T-grade main line filter is 1um, which removes solid and liquid particles of 1um and larger, and the residual oil content is 1ppm w / w. A-class high-efficiency degreasing mist filter has a filtering accuracy of 0.01um and removes solid and liquid particles of 0.01um and larger, 99.999 +% oil mist; the residual oil content is 0.001ppm w / w. Compressed air quality reaches ISO8573.1 quality level 1.
4.Activated carbon adsorption filter
In order to prevent the T-level filtered trace oil from entering the pressure swing adsorption carbon molecular sieve, an activated carbon adsorption filter is solidly added to ensure that the air entering the nitrogen generator is cleaner.
Third, the pressure swing adsorption oxygen generation system
There are two adsorption towers filled with lithium molecular sieves in the PSA lithium molecular sieve oxygen generator. Clean, dry compressed air enters the PSA oxygen generator and flows through the adsorption towers filled with lithium molecular sieve. Compressed air flows from the bottom to the top of the adsorption tower, using molecular sieves to adsorb nitrogen and oxygen under different pressures. The oxygen, water, carbon dioxide and other components are adsorbed on the surface of lithium molecular sieve. It becomes product gas, flows out from the upper end of the adsorption tower, and enters the buffer tank. After a period of time, the oxygen adsorbed by the lithium molecular sieve in the adsorption tower becomes saturated and needs to be regenerated.
Regeneration is achieved by stopping the adsorption step and reducing the pressure in the adsorption tower. After the adsorption tower has completed the short-term equalization, the pressure will be reduced to remove the adsorbed nitrogen, water, carbon dioxide and other components, and the regeneration process will be completed.
The two adsorption towers alternately adsorb and regenerate to produce product oxygen with stable flow and purity. The switching of the two adsorbers is automatically completed by a PLC-controlled program-controlled valve. The performance of a PSA oxygen generator depends on the performance of the adsorber, lithium molecular sieve, process flow, equipment structure, and electromagnetic pneumatic valve. The pressure swing adsorption oxygen generating device produced by our company uses the PLC programmable controller produced by Japan's Mitsubishi Corporation, and the imported electromagnetic molecular sieve imported from the United States and the electromagnetic pneumatic valve produced by Germany's Baode company.
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