Oxygen Gas Plant Nm3/h KDON-2500 GOX /500 LOX / 2500 LIN / 100 Ar
Liquid Argon Rare Gas
Air Separation Plant KDON 1200~2650 Nm3/h Series
Typical Product: KDON-2500GOX/500LOX/2500LIN/100Ar Air Separation Plant
Output, purity and pressure
2PPm O2 ,3PPm N2
This plant adopts a MS purification air process with high
temperature/low temperature booster expander, refrigeration by
nitrogen recycle, as well as production argon by complete
rectification without nitrogen.
- Feed air gets elimination of dust and other mechanical impurities
in self-cleaning type filter and enters centrifugal compressor to
be compressed to 0.62MPa(A), and then it’s cooled to 10℃ in
pre-cooler. After air is elimination of CO2 and moisture in molecular sieve purifier, the purified air enters
cold box and after it gets cooled by the reflux gas in medium
pressure heat exchanger, it goes into lower column to be separated
originally to obtain liquid nitrogen and enrich oxygen liquid air.
Liquid air and liquid nitrogen are drawn from lower column to be
cooled in subcooler, then the throttled air is fed into upper
column to be further rectification. The product liquid oxygen is
obtained at the bottom of upper column, and after subcooled in
subcooler, it is fed out of cold box to liquid oxygen storage tank.
- After the waste nitrogen gas drawn from upper column is rewarmed
and fed out of cold box for the regeneration gas of molecular
sieve. Low pressure nitrogen gas is fed out of the top of upper
column for supply client after it is compressed.
- The nitrogen gas at the top of lower column is divided into two
streams. One is liquefied by liquid oxygen at low pressure side of
main condenser and refluxed into lower column as the reflux liquid.
Another stream is rewarmed and fed out of cold box, and then it
enters medium pressure recycle nitrogen gas pipe.
- The medium recycle nitrogen gas is fed into recycle nitrogen
compressor by nitrogen pipe, after the nitrogen gets compressed to
2.6 MPa(G), it is divided into two stream, after the first stream
enters cold box to be cooled in medium pressure heat exchanger, it
enters high temperature expander. The expanded nitrogen enters
medium pressure heat exchanger to be rewarmed and fed out of cold
box to pressure nitrogen main pipe. After the second one is boosted
at boosting end of low temperature expander, it goes into cold box
and after it is cooled in medium pressure heat exchanger, it is
divided into two parts. The most expanded nitrogen in low
temperature expander is rewarmed and fed out of cold box into
pressure nitrogen main pipe. While the rest nitrogen cooled in
medium pressure heat exchanger is throttled, one part of product
liquid nitrogen drawn to be subcooled in subcooler and fed out of
cold box into liquid nitrogen storage tank. The rest returns lower
column as the reflux liquid of lower column.
- The nitrogen into pressure main pipe is compressed in recycle
nitrogen compressor. A finished recycle supplies the refrigerant to
the whole plant.
- A certain content argon fraction drawn from the middle portion of
upper column is fed into crude argon column. The crude argon column
is divided into two sections structurally. The reflux liquid in the
bottom of the second argon column is fed into the top of the first
section as reflux liquid through liquid pump. Crude argon obtained
by rectification in crude argon column is fed into the middle
portion of pure argon column. After rectification in pure argon
column, the pure liquid argon obtained from the bottom of pure
argon column is fed out of cold box and into storage tank.
A certain content of oxygen fraction drawn from the middle portion
of crude argon column is fed into the top of high pure oxygen
column as reflux liquid. Liquid oxygen at the bottom of column is
vaporized and rectified with reflux liquid. And the high pure
liquid oxygen obtained at the middle portion of high pure oxygen
column as the product is fed out of cold box; the oxygen gas in the
top is fed into crude argon column. A part of liquid oxygen drawn
from bottom is fed into upper column.
2. Welding and metal processing
3. Health care
4. Medical science
1. No loss, high returns
2. High market share
3. Successful experience of made many plants
4. Low Operating Cost