Liquid nitrogen generator 2000 Nm3/h KDN-2000 Pure nitrogen plant
Filling Gas Sealing Test
The standard products for Liquid Nitrogen Generator KDN series
which are manufactured by our company
Typical Product: KDN-2000 Liquid nitrogen generator
Output, purity and pressure
Note: 1. All pressures which are not specially defined are the
2. Nm3/h is defined as the volume at 0℃, 101.3kPa(A);
3. The liquid output is calculated from data of gas, and the
pressure is calculated with 0 meter high at outlet of cold box.
This plant employs a process in which the air is purified by
molecular sieve, expansion turbine is provided with braking
effected by fan and nitrogen is produced by means of single column
with expansion accomplished through backflow.
After the feed air is cleaned of dust and mechanical impurities
in air filter, it is compressed in air compressor. The compressed
air is then fed into air pre-cooling system to become saturated.
The saturated and compressed air flows into switched molecular
sieve adsorbers where such hydrocarbons as H2O, CO2 and C2H2 are
adsorbed from the air.
A small part of purified process air is drawn out to be used as
instrument air and the remainder is fed into main heat exchanger.
The expanded waste nitrogen is drawn, which cooled after being
expanded to a saturation temperature and moisture- bearing to a
certain extent, is throttled into the bottom of nitrogen column for
participation in rectification. The nitrogen gas and liquid
nitrogen are then obtained at the top of nitrogen column while the
saturated and oxygen-rich liquid air at the bottom of column is
throttled into the evaporation side of condenser evaporator to
condense the nitrogen gas at the top of column.
Oxygen-rich liquid air at the evaporation side of condenser
evaporator is heated and vapored to be saturated gas by nitrogen
gas at the top of column, and then it is drawn out and into cold
end of main heat exchanger, after being rewarmed, it is drawn out
and into turbo-expander to be expanded and refrigerated.
Expanded oxygen-rich liquid air enters main heat exchanger to be
rewarmed to normal temperature and to be fed out of cold box;
partial gas is to be regeneration gas for molecular sieve adsorber,
the rest is blowed off.
The nitrogen gas and liquid nitrogen are drawn out of the top of
nitrogen column. The nitrogen gas flows out of cold box to the
client with the required pressure by client after it is reheated in
main heat exchanger to a normal temperature. The liquid nitrogen
will be drawn out of the top of column and throttled to the
required pressure and fed out of cold box to the storage tank, and
is used as the spare gas of pure nitrogen equipment.
In order to prevent hydrocarbon from accumulating in condenser
evaporator, a small stream of liquid drawn from oxygen-rich liquid
air evaporation side is discharged as waste liquid.
1. Pulp & Paper
2. pH Neutralization Gas
3. Balance Gas
4. Process Gas
4. Standard Gas
6. Medical Gas
7. Shielding gas
1. High market share
2. Professional design and manufacturing
3. Rich historical experience over 60 years
4. The advanced PLC centralized control technology is utilized to
realize the integral control of central, local panel and on-site
controls with the result that the production process of the
complete nitrogen plant can be effectively monitored.
5. By means of single column with expansion accomplished through
backflow, which can supply nitrogen gas with medium pressure
directly without compression in backward nitrogen compressor, which
not only cuts down cost, but also prevents secondary pollution, as
well as reduces power consumption.