Air separation unit KDON-4500/2800/100 4500 Nm3/h ~ 5000 Nm3/h Gas fresh preservation
Specifications:
The KDON-4000~4500 series of air separation unit
| MODEL CONTENTS | KDN-4700/3900/100 | KDN-4500/4500/130 | KDN-4500/ 4500/130 | KDN-4500/5000/120 | KDN-4500/9000/120 |
| GOX/GAN/ LAr flow | Nm3/h | 4000/3900/100 | 4500/4500/130 | 4500/4500/ 130 | 5000/5000/120 | 4500/ 9000/120 |
| GOX/GAN/ LAr purity | ppm | 99.5%O2/ 5ppm(O2)/2ppmO2, 3ppmN2 | 99.6%O2/ 10ppm(O2)/ 2ppm(O2), 99.9995% Ar | 99.6%O2/ 3ppm(O2)/ 99.999% Ar | 99.6%O2/ 10ppm(O2)/ 99.9995% Ar | 99.6% O2/ 10ppm(O2)/ 99.9995% Ar |
| GOX/GAN/LAr pressure | MPa | 1.35/1.8/ 0.12 | 0.02/0.015/ 0.16 | 0.02/0.015/ 0.16 | 0.015/0.01/0.12 | 0.015/ 0.01/0.15 |
| Subcooled | ℃ | 39/39/ -183 | 22/22/ -181 | 22/22/-181 | 19/19/-181 | 19/19/ -181 |
Typical Product: KDON-4500/2800/100 Air separation unit
Output, purity and pressure
| | Flow (Nm3/h) | Purity | Pressure MPa(G) | Subcooled (℃) |
| GOX/GAN/ LAr | 4500 Nm3/h /2800 Nm3/h/100Nm3/h | 99.5% O2 / 5ppm(O2)/ 2ppmO2,3ppmN2 | 1.35/1.8/0.12 | 39/39/-183 |
Description:
This plant employs a process in which the air is purified by molecular sieve at normal temperature and refrigeration is created by booster turbo expander. The fractionating column is packed with structural packing and argon is extracted through complete rectification.
After the feed air is cleaned of dust and mechanical impurities in air filter, it is compressed in air compressor to a certain pressure and then pre-cooled in air cooling tower. The water supply to air cooling tower is divided into 2 sections. The treated circulating water is used at the lower section of air cooling tower while the low temperature water cooled by water cooling tower is used at the upper section of air cooling tower. The wire-mesh screen demister is provided at the top of air cooling tower in order to prevent the moisture from being brought out and remove the water drops in air.
The air going out of air cooling tower flows into 2 switched molecular sieve adsorbers for removal of such impurities as H2O, CO2 and C2H2 from the air.
The purified process air is divided into 3 streams of which one is used as the instrument air. The second stream flows through main heat exchanger into lower column to take part in the rectification. The third stream is boosted in recycle compressor. The air at a flowrate equivalent to expander capacity is extracted from the medium pressure section of recycle compressor, boosted and cooled at the booster end of expander and then fed to main heat exchanger. It is extracted from the middle part of exchanger, expanded in the expander and fed to the lower column for participation in rectification. The rest is boosted and cooled at the high pressure section of recycle compressor and then cooled in main heat exchanger. It flows into lower column for participation in rectification after being fed out of main heat exchanger and throttled. After the air is preliminarily rectified in lower column, the liquid air and pure liquid nitrogen are obtained. The liquid air and pure liquid nitrogen extracted from the lower column are throttled through subcooled and fed to the upper column. Following further rectification in upper column, the liquid oxygen at purity of 99.6％ is obtained at the bottom of upper column. Some of the liquid oxygen is delivered to the liquid oxygen pump, reheated in main heat exchanger after it is compressed to a certain pressure and then delivered to the client. The rest is delivered to the liquid oxygen storage system.
Some of the liquid nitrogen drawn out of the top of upper column is delivered to the liquid nitrogen storage system. The rest is delivered to the liquid nitrogen pump and fed out of cold box to the client after it is compressed to a certain pressure and reheated in main heat exchanger.
After the waste nitrogen gas drawn from the upper part of upper column is reheated in subcooler and main heat exchanger, it is fed out of cold box to mainly satisfy the regeneration of molecular sieve while the rest is delivered to water cooling tower.
A certain amount of argon fraction is extracted from the middle part of upper column is fed to the crude argon column. The crude argon column is divided into 2 sections in structure. The reflowing liquid at the bottom of the second section (crude argon column Ⅱ) is delivered through liquid pump to the top of the first section (crude argon column Ⅰ) where it is also used as the reflowing liquid. After the argon fraction is rectified in crude argon column, the crude liquid argon is obtained and fed to the middle part of pure argon column. The pure liquid argon product is obtained at the column bottom following rectification. Some of liquid argon is delivered to the liquid argon pump and fed out of cold box to the client after it is compressed to a certain pressure and reheated in main heat exchanger while the rest is delivered to the liquid argon storage system.
Applications:
- Fumigation Gas
- Ripening Gases for Fruits
- Agricultural and Agro Industry
- Gas fresh preservation
- Protective Gas
- Inert Gas
Competitive Advantage:
- Impeccable quality management system
- Low power consumption
- Short time delivery & Good service
- Long service life
- High market share
