Liquid Nitrogen Plants

• Fully modular design — nitrogen generation and liquefaction units are compactly integrated, minimizing footprint
• PSA nitrogen generation — no cryogenic air separation required; fast startup, on-stream nitrogen ≤30 min
• Adjustable nitrogen purity from 99% to 99.999%, adaptable to a wide range of industrial applications
• Liquefaction unit uses high-efficiency Joule-Thomson expansion refrigeration cycle with high liquefaction rate and low specific energy consumption
• Liquid nitrogen stored in vacuum multi-layer insulated tanks with daily evaporation rate ≤0.3%, ensuring long storage life
• Fully automated PLC control with remote monitoring and fault alarm; unattended operation supported
• Customizable liquid nitrogen outlet pressure (0.05–0.8 MPa), compatible with vaporizer filling or direct use
• Key components use premium cryogenic-grade materials; design service life ≥15 years

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Estimated Liquid Nitrogen Plants Price

Nitrogen concentration (%) (optional)
- <90
- 95
- 99
- 99.5
- 99.99
- 99.995
- 99.999
- 99.9995
Productivity (m³ / h)
- 10
- 20
- 30
- 40
- 50
- 60
- 80
- 100
- 150
- 200
- 300
- 500
- 1000
- 3000
Nitrogen pressure (bar)
- 0-10
- 10-40
- 150
- 200

The approximate cost will be: 0

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Product & Technical Features

Low Evaporation Storage
- Liquid nitrogen stored in vacuum multi-layer insulated tanks with daily evaporation rate ≤0.3%, ensuring long storage life
Intelligent Auto Control
- Fully automated PLC control with remote monitoring and fault alarm; unattended operation supported
Adjustable Outlet Pressure
- Customizable liquid nitrogen outlet pressure (0.05–0.8 MPa), compatible with vaporizer filling or direct use
Durable Premium Build
- Key components use premium cryogenic-grade materials; design service life ≥15 years

Core Advantages

Low Capital Cost

No large cold box required; PSA + liquefaction investment is only 30–50% of cryogenic ASU
Short Delivery Cycle

Factory-modular production; standard models delivered in as few as 6–8 weeks.
Easy O&M

PSA molecular sieve periodic regeneration; no cryogenic refrigerant management; minimal maintenance.

Flexible scale: Liquid production from grams to several tons per day; ideal for small and medium self-supply stations
Safe and Reliable

Nitrogen is inert; closed-loop cryogenic liquefaction system with no explosion hazard.
Green & Energy-efficient

PSA consumes only electricity; no chemicals, zero emissions, compliant with green factory standards.

Product Specifications

Cryogenic Liquefaction Unit (Standard Configuration)

Parameter	Value	Remark
Liquefaction Feed Gas	High-purity N₂ (≥99.5%)	Directly from PSA unit
Refrigeration Method	Joule-Thomson expansion cycle	No external refrigerant
LN₂ Tank Volume	5–100 m³ (customizable)	Vacuum multi-layer insulation
LN₂ Tank Working Pressure	≤0.8 MPa
Daily Evaporation Rate	≤0.3%	Per GB/T 18443
LN₂ Outlet Temperature	≤-193 ℃
Cold Start-up Time	≤4 h (first cold-down)
Liquefaction Efficiency	≥80% (liquefied / feed)
Overall Power Consumption	≤0.35 kWh/L (liquid N₂)	Includes N₂ gen. + liquefaction

Working Principle

Air Pre-treatment: Compressed air is filtered and dried to remove moisture and oil, ensuring clean gas enters the adsorption towers.
PSA Nitrogen Generation: Carbon Molecular Sieve (CMS) selectively adsorbs O₂ under high pressure and desorbs under low pressure. Dual-tower alternation provides continuous high-purity nitrogen output.
Nitrogen Buffer & Purification: Nitrogen passes through a buffer tank for pressure stabilization; an optional catalytic deoxygenator further reduces residual O₂ to ≤1 ppm.
Cryogenic Liquefaction: Nitrogen passes through a Joule-Thomson expansion valve, dropping rapidly to the liquefaction point (-196 °C). Unliquefied cold nitrogen returns through the heat exchanger to pre-cool incoming gas, forming a closed cold-energy recovery cycle to enhance efficiency.
LN₂ Storage & Vaporization: Liquid nitrogen is collected and stored in vacuum insulated tanks. On demand, it is vaporized via an ambient or heated vaporizer for gaseous supply, or dispensed directly in liquid form.

Key Application Scenarios

PSA Nitrogen Generators are widely used in industries requiring inert gas for blanketing, purging, padding, or chemical processes:

Food Freezing & Preservation

LN₂ cryogenic freezing locks in nutritional value and color; LN₂ inerting of packaging extends shelf life.
Electronics & Semiconductor

Provides ultra-high purity nitrogen blanket; LN₂ cold traps support MBE and cryopump systems.
Medical & Biobank Storage

LN₂ cryogenic containers preserve cells, tissues, semen, and blood samples at -196 °C for long-term storage.
Metal Heat Treatment & Cryogenic Processing

LN₂ deep-freeze treatment (-130 °C to -196 °C) on steel and aluminum improves hardness and dimensional stability.
Chemical & Polymer Research

LN₂ provides low-temperature cooling baths for exothermic polymerization reactors, preventing thermal runaway.
Laser Cutting & Metalworking

High-purity nitrogen vaporized from LN₂ serves as cutting assist gas, preventing edge oxidation for clean, burr-free cuts.
Energy Storage & Gas Cylinder Filling

LN₂ serves as a cold energy carrier for thermal storage; vaporization fills high-pressure nitrogen cylinders for off-site or mobile nitrogen supply.