Liquid oxygen plant 1000 Nm3/h ~ 1500 Nm3/h KDON-1000Y/1000Y/32Y Carrier Gas Cutting Gas Fuel Gas
1000 Nm3/h ~ 1500 Nm3/h KDON Series Air Separation Plant
Typical Product: KDON-1000Y/1000Y/32Y Liquid oxygen plant
Output, purity and pressure
The feed air inhaled from the suction inlet flows into the
self-cleaning air filter AF where the dust and other mechanical
impurities are removed, and then flows into the centrifuge feed air
compressor to be compressed to around 0.625MPa(A). The compressed
air flows into the air pre-cooling unit to be cooled to around 10℃,
and then enters into the switched molecular sieve MS1201(or MS1202)
where the CO2, carbohydrate and water vapor are adsorbed. The two
molecular sieve purifiers are switched, when one is during working,
another is during regeneration, and automatic switches regularly.
The purified air mixed with the refluxed air which is rewarmed in
the main heat exchanger after being expanded goes to the
centrifugal circulating air compressor to be compressed to around
2.5MPa(A), and then enters the cold box to be cooled to 253K in the
main heat exchanger after being boosted by the boosting end of the
expander, and then it enters the cryogenic refrigerator to be
cooled to 243K, and goes back to the main heat exchanger to be
cooled to 162K, and then it is divided into two streams: one steam
of circulating air flows into the expander to be expanded, and the
part expansion air enters the lower column, and the rest reflux and
enters the main heat exchanger to be rewarmed, and then goes out of
the cold box to the centrifuge circulating air compressor to be as
circulating air; the other steam enters the lower column after
being cooled and throttled.
The air is preliminarily separated into gaseous nitrogen and
oxygen-enriched liquid air in the lower column, and the top gaseous
nitrogen is liquefied in the mian condenser K1, and at the same
time, the liquid oxygen at the low pressure side of the main cold
box is gasified. Part liquid nitrogen is as the reflux liquid of
the lower column, and the other part of liquid nitrogen will be
extracted from the top of the lower column and subcooledin the
subcooler E3 with purify gaseous nitrogen and wasten gaseous
nitrogen, and a part is sent to the storage tank as product, and
the rest is fed to the top of the upper column C2 after being
throttled. The wasten liquid nitrogen (oxygen content is 1% O2) is
fed to the upside of the upper column C2 after being subcooled in
E3 and throttled. The liquid air is fed to the middle of the upper
column C2 as reflux liquid after being subcooled in the subcooler
E3 and throttled.
The product liquid oxygen is extracted from the bottom of the upper
column, and fed to the storage tank after being subcooled in the
The purify gaseous nitrogen is extracted from the top of the upper
column, and goes out of the cold box as the product after being
rewarmed in the subcooler and medium pressure heat exchanger.
The wasten nitrogen extracted from the top of the upper column goes
out of the cold box after being rewarmed in the subcooler and main
heat exchanger, and then goes into the electric heater as the
regeneration gas of the molecular sieve.
- Shielding gas
- Standard Gas
- Process Gas
- Sterilization Gas
- N2 Converter Rental
- Cutting Gas
- Fuel Gas
- Carrier Gas
1) The molecular sieve purifies the air with boosting expander
process, and air circulating refrigeration.
2) The air pre-cooling system employs pre-cooling unit, which is
easy to be operated.
3) The molecular sieve is used to purify the air, which greatly
improves the reliability and safety of the plant operation.
4) The sieve plate tower is used to reduce the investment and the
height of cold box.
5) The system uses the advanced DCS control technology which
realizes the integrated control at local cabinet and on site, and
can effectively monitor the production duration of air separation
plant. The control system has such advantages as of
advanced/reliable design and high ratio between performance and