Liquid nitrogen generator 3000Nm3/h / 100L/h KDN-3000/100 Standard Gas
The Standard Products List for KDN 2500 ~ 3000 Series Nitrogen
Typical Product: KDN-3000/100Y Liquid Nitrogen Generator
Output, purity and pressure
The plant’s process is using molecular sieve to purify air, and
using waste nitrogen backflow expansion for refrigeration.
The process flow drawing of this plant as follows:
1. Enrichment Gas
2. Spectroscope Gas
3. Oil and Gas Field
4. Petroleum refining
5. Electronics & Semi Conductors
All pressure vessel of this nitrogen plant is designed and
manufactured in accordance with ASME specifications for long,
stable and reliable running, economization of energy, convenient
operation and maintenance. The process is featured by the
(1) 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.
(2) PLC is used to control the automatic switchover of molecular
sieve purification system such that the reliability and safety in
running of the plant are greatly improved and the loss in
switchover of air is reduced.
(3) The advanced software introduced from abroad for calculation of
performance is used to analyze the optimization of process adopted
by this plant. The more advanced program developed by Hangyang
itself on the basis of rectification design module from Linde for
rectification calculation and verified in many air separation
plants is applied to ensure the price proportion of optimum
technical/economical figures to fine performance.
(4) The plate and fin heat exchangers are brazed by large size
vacuum brazing furnace which is the first one in China imported
from SW Corp. in USA. The cores vacuum brazed by this furnace are
of good quality and in long service life. Hangyang has developed
new and efficient fin types in recent years to get the heat
exchangers more efficient.
(5) The stress is analyzed and strength is calculated in details
for the cold box in fractionating column system in accordance with
the client’s local meteorological and geological conditions to
ensure the safety of cold box. The stress is analyzed for the main
pipelines located in cold box. The aluminum alloy material with
high strength is used to fabricate these pipelines to keep them
non-deformable. The 3 kinds of supports in cold box are made of
stainless steel such that the strength at low temperature can be
ensured and the loss in heat conduction is reduced. The valves in
the cold box are manual controlled.
(6) 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.