Oxygen Gas Plant Nm3/h KDON-2600/1500 ASP
The followings are the standard products for the Cryogenic Air
Separation Plant KDON series which are manufactured by our company.
Regarding other particular product can be calculated and designed
according to the actual requirements.
≤2 ppm O2
≤3 ppm N2
Typical Product: KDON-2600/1500 Cryogenic Air Separation Plant
Output, purity and pressure
This ASU adopts a process in which air is purified by normal
temperature molecular sieve, refrigerated by booster expansion
turbine; the fractionating cloumn adopts the external compression
process with sieve plates techology. This ASU is able to run
economically and properly in the load adjustment range 80% ~105% of
production capaicty, without adding any other equipment. Its
process procedure is as the followings:
Following the elimination of dust and other mechanical impurities
from process air in an air filter, the process air enters air
turbo- compressor where it is compressed to a certain pressure, and
then it is cooled in a cooling column. The feed water to air
cooling column is divided into two section, the circulating water
treated with water is used in the lower section of cooling column,
while the cryogenic water cooled by water cooling column is used in
the upper section of cooling column. And a demister is set on the
top of air cooling column to prevent moisture dragout and
elimination of water drops in air.
Process air out of air cooling column enters the alternately -
operated molecular sieve adsorbers where such impurities contained
in air as moisture, CO2 and C2H2 etc. are adsorbed.
The cleaned process air is divided into 3 streams: A small portion
of the purified processed air is drawn out as instrument air. One
portion enters main heat exchanger E1 to be cooled down to
saturation temperature with reversed gas and then enters lower
tower C1; Another portion of the air with its quantity equals to
the swelling quantity to the booster, supercharged by the booster,
then cooled to normal temperature by cooling water before entering
the main heat exchanger E1. It is drawn out from the middle of the
main heat exchanger and expanded by the expander ET. Most part of
the expanded air is fed to the upper column for rectification, the
air is initially rectified in the lower column, where liquid air is
obtained at its bottom, pure liquid nitrogen is obtained at its
top. The liquid air and pure liquid nitrogen drawn out from the
lower column are subcooled in the liquid air and liquid nitrogen
subcooler E2 before entering the upper column. After further
rectification in the upper column, product gaseous oxygen and
liquid oxygen with low pressure is obtained at its bottom, oxygen
gas is fed out of cold box to GOX pipe network by compression of
oxygen compressor after rewarmed through main heat exchanger.
Meanwhile, partial liquid oxygen is drawn out of the bottom of
upper column to the liquid oxygen storage system.
Pure gaseous nitrogen is drawn out of the top of upper column to be
rewarmed in subcooler and main heat exchanger before it is fed out
of cold box, and then it is fed to GAN pipe network after
compession of nitrogen compessor.
Waste nitrogen gas is drawn out of the upper portion of upper
column to and rewarmed in subcooler and main heat exchanger before
it’s fed out of cold box for meeting the requirement of
regeneration gas for molecular sieve firstly, and then the rest is
delivered to water cooling column.
LOX back-up system: liquid oxygen in storage tank is supercharged
by LOX pump before it is rewarmed in LOX vaporizer to be gaseous
oxygen to GOX pipe network.
LIN back-up system: liquid oxygen in storage tank is supercharged
by LIN pump before it is rewarmed in LIN vaporizer to be gaseous
oxygen to GAN pipe network.
2. Sealing Gas
3. Water and wastewater treatment
4. Metal production
1. Low power consumption
2. Economization of energy,
3. Good quality materials
4. All gas and liquid plants are optimized to meet
customer-specific site requirements