product |
Liquid Nitrogen Generator |
Trademark |
Skid Mounted |
Gas |
N2 |
Purity |
99%-99.999% |
Noise Level |
Low |
voltage |
220V |
certification |
ISO, CE, ISO1400/18001 |
manufacturer |
china |
Application |
Industry / Agriculture / Livestock / Food / Medical / Electronic |
trade mark |
LDH |
Transport Package |
Pre-Packing |
working temperature |
5-45ºC |

Working Principle of Liquid Nitrogen Generator
The LDH nitrogen liquefier produces liquid nitrogen through cryogenic refrigeration. High-purity nitrogen (typically ≥99.99%) is first generated via pressure swing adsorption (PSA) or membrane separation, which selectively removes oxygen, moisture, and other impurities from ambient air using carbon molecular sieve (CMS) or polymeric membranes.
The liquefaction process employs a mixed refrigerant cycle or pulse tube refrigerator to cool nitrogen to its boiling point of -196°C. This cryogenic system integrates heat exchangers, expansion valves, and compressors to achieve continuous liquefaction. PSA technology, a cornerstone of industrial gas separation, relies on CMS adsorbents to preferentially adsorb oxygen and other trace gases under pressure, releasing purified nitrogen for subsequent liquefaction.
Principle of nitrogen liquefier
The nitrogen liquefier consists of a compression unit and a cold box unit. The compression unit features two single-stage oil-lubricated compressors with associated oil separators and air/water-cooled condensers. The cold box unit mainly includes a pre-cooling heat exchanger, a separator, and a main cooling heat exchanger. The separator removes high-boiling working fluids to prevent lubricating oil or other contaminants from entering the cryogenic heat exchanger pipelines, thus avoiding blockages. Nitrogen is liquefied into a subcooled state via the main heat exchanger, then throttled through an LN2 throttle valve into a dewar for storage. Boil-off gas (BOG) is vented to the atmosphere.
aseptic filtration
Compressed air through the screw air compressor, after cold dry suction dry filtration, into the PSA nitrogen machine, through the sterilization filter to generate dew point-60 °C sterile nitrogen.
Carbon molecular sieve adsorption
Using carbon molecular sieve as adsorbent, using the difference of adsorption amount of oxygen and nitrogen molecules in compressed air in molecular sieve, the gas separation equipment of product nitrogen is directly prepared from compressed air by the principle of pressurized adsorption and depressurization desorption.
high efficient and energy-saving
Fast and stable on-site product nitrogen production, the shortest in 10 ~ 20 minutes to produce qualified nitrogen. The use of more efficient and stable molecular sieves and the use of unique PSA energy-saving technology have lower energy consumption.

Model |
LPLN-3 |
LPLN-5 |
LPLN-10-W |
LPLN-20-W |
LPLN-40-W |
Liquid nitrogen production (L/day) |
80 |
120 |
240 |
500 |
720 |
1000 |
1200 |
Liquid nitrogen production (L/h) |
3 |
5 |
10 |
20 |
30 |
40 |
50 |
Installed power(kW) |
8 |
9 |
11 |
25 |
25 |
35 |
35 |
Type(AC V) |
380/50Hz |
380/50Hz |
380/50Hz |
380/50Hz |
380/50Hz |
380/50Hz |
380/50Hz |
Cooling form |
Air cold |
Air cold |
Water cold |
Water cold |
Water cold |
Water cold |
Water cold |
model |
LPLN-10 |
LPLN-20 |
LPLN-40 |
LPLN-80 |
LPLN-120 |
LPLN-240 |
LPLN-480 |
|
all-in-one machine |
separated type |
output |
0.3-0.4L/H |
0.8-1L/H |
1.6-2L/H |
3L/H |
5L/H |
10L/H |
20L/H |
|
|
|
|
|
|
|
8-10L/day |
20-24L/day |
40-50L/day |
72L/day |
120L/day |
240L/day |
480L/day |
purity |
≥99% |
≥99% |
voltage-to-frequency |
220VAC
1P
50Hz |
380VAC 3P 50Hz
220VAC 1P 50Hz |
Power ( KW ) |
2 |
4.5 |
7.5 |
12.5 |
15 |
27 |
45 |
Area ( m2 ) |
1 |
1.5 |
3 |
3.5 |
3.5 |
10 |
30 |
Equipment Size (MM) |
750*650*1500 |
1150*850*2000 |
1250*2000*2000 |
1250*2000*2000 |
1250*2000*2000 |
6000*1100*2200 |
8000*1700*2300 |
Occupying an area
of (m2) |
>5 |
>6 |
>10 |
>15 |
>15 |
>30 |
>50 |
Container size |
|
|
|
|
|
20-foot cabinet |
40 feet high cabinet
9.6 meters long |
Environmental
temperature
requirements |
0-30ºC
proper ventilation |
|
0-35ºC
proper ventilation |
One meter noise(Db) |
<65Db |
<65Db |
<65Db |
<65Db |
<65Db |
<72Db |
<78Db |
cooling type |
wind cooling |
wind cooling |
wind cooling |
wind cooling |
wind cooling |
water cooling |
water cooling |
cooling water volume
(m³/h) |
|
|
|
|
|
>4 |
>8 |
nitrogen amount (m³/h) |
1 |
2 |
4 |
6 |
8 |
15 |
30 |
nitrogen dew point
(ºC) |
-60ºC |
nitrogen pressure
(Mpa) |
0.8 |
Liquid nitrogen tank
proposal(L) |
30 |
50 |
100 |
175 |
300 |
500 |
1000 |
miscellaneous |
Non-standard voltage frequency, altitude > 1000 meters, purity ≥ 99.9, need to be customized ;
equipment above 100L / h is customized according to the customer 's site conditions. |
Application of liquid nitrogen machine
1. Food Industry:
Liquid nitrogen machines are used for rapid freezing of food items such as seafood, meats, and vegetables, swiftly locking in freshness and nutrients while minimizing ice crystal formation, thereby preserving texture and flavor. Additionally, they are employed in the creation of liquid nitrogen ice cream and molecular gastronomy, offering unique culinary experiences.
2. Healthcare:
In the medical field, liquid nitrogen generated by these machines is used for long-term preservation of biological samples like cell lines, blood, and tissue samples, maintaining their viability and stability. It also finds application in cryotherapy during surgical procedures, removing warts, skin lesions, and in reproductive medicine for sperm and egg freezing.
3. Metalworking:
In metal casting, welding, and cutting processes, liquid nitrogen machines are utilized to rapidly cool metal surfaces, reducing thermal deformation and cracking, enhancing the strength and precision of metal components.
4. Chemicals & Pharmaceuticals:
In the chemical and pharmaceutical sectors, liquid nitrogen serves as an inert protective gas, preventing material oxidation and maintaining an inert production environment to ensure product quality and safety. It is further employed in the low-temperature synthesis and crystallization processes of certain products.
5. Electronics & Semiconductors:
In electronics and semiconductor manufacturing, the cold environment provided by liquid nitrogen machines is used in material processing, packaging, and testing of electronic components, improving product performance and stability.
6. Scientific Research & Laboratories:
Liquid nitrogen is used in laboratories for cryogenic experiments, sample freezing, and preservation, such as in cell cultures, DNA extraction, protein crystallization, and physical experiments requiring extreme low temperatures.
7. Oil & Gas Extraction:
In the oil and gas industry, liquid nitrogen is used to enhance recovery rates through injection, increasing underground pressure to improve fluid flow, and also in drilling processes for cooling and cleaning.
8. Environmental Remediation:
In environmental management, liquid nitrogen is employed in soil and groundwater pollution control, solidifying pollutants through cryogenic techniques for easier excavation and treatment.
9. Beauty Industry:
In the beauty sector, liquid nitrogen is used in cryotherapy treatments for removing skin imperfections, tightening skin, reducing inflammation, and in certain non-invasive cosmetic procedures as a cooling medium.
10. Entertainment & Celebrations:
In entertainment and event celebrations, liquid nitrogen is utilized to create stage effects such as smoke, adding visual drama and spectacle.




Packaging and transportation
