Liquid Oxygen Plant
Overview
The Liquid Oxygen Plant is an industrial facility that produces high-purity liquid oxygen from atmospheric air. It compresses, cools, and separates air into oxygen and other gases through cryogenic distillation, providing a continuous, reliable supply of liquid oxygen.
Working principle
| Step | Process | Key Points |
|---|---|---|
| 1 | Air Compression | Compress ambient air to 0.5–1.0 MPa to enable liquefaction. |
| 2 | Air Pre-Cooling | Lower air temperature below 10°C; removes most moisture. |
| 3 | Air Purification | Remove moisture, CO₂, hydrocarbons via adsorption to prevent freezing/blockage. |
| 4 | Air Liquefaction | Heat exchange with reflux gas cools air to ~-173°C; partial liquefaction occurs in condenser evaporator. |
| 5 | Distillation Separation | Two-stage distillation separates oxygen and nitrogen: • Lower tower: produces O₂-rich liquid (~38%) and nitrogen gas • Upper tower: O₂-rich liquid distilled to >99.6% purity; nitrogen collected at top |
| 6 | Product Output | Liquid oxygen stored or vaporized for delivery; low-pressure O₂ can be compressed and sent to users; nitrogen, argon, and other by-products recovered simultaneously. |
Core Features
High purity
It can stably produce oxygen with a purity of over 99.6%, and can reach 99.9% under special configurations, meeting the needs of high-precision fields such as metallurgy and electronics.
01
Large production capacity
The oxygen output of a single set of equipment can range from tens of cubic meters/hour to tens of thousands of cubic meters/hour, suitable for large-scale industrial oxygen use scenarios.
02
Continuity
Once started and running stably, it can produce gas continuously for a long time, with a typical operating cycle of 1-3 years (requiring regular shutdown maintenance).
03
Rich by-products
In addition to deoxygenated gas, high-purity nitrogen (over 99.999%), argon (over 99.999%), rare gases such as neon and helium can be simultaneously produced, improving resource utilization efficiency.
04
Long start-up time
Due to the need to complete system cooling, liquefaction, and other processes, it usually takes 12-48 hours to start up to standard gas production (which can be shortened to several hours for small equipment).
05
Comparison of various oxygen production methods
|
Oxygen production method |
Core principles |
Advantages |
Applicable scenarios |
|
cryogenic oxygen generator |
Cryogenic Distillation separation of air |
High purity, large production capacity, and the ability to produce multiple gases |
Large scale industrial oxygen using |
|
Vacuum pressure swing adsorption oxygen generator(VPSA) |
Molecular sieve adsorption selective separation, micro positive pressure adsorption, negative pressure desorption |
Fast startup and lowest energy consumption |
Small and medium-sized oxygen use (medical, small-scale industrial) |
|
Pressure Swing Adsorption Oxygen Generator (PSA) |
Molecular sieve adsorption selective separation, high-pressure adsorption, micro positive pressure desorption adsorption |
Fast start-up, low energy consumption, compact equipment |
Small scale use of oxygen (medical, etc.) |
|
Membrane separation oxygen generator |
Selective permeation of oxygen by polymer membranes |
Simple structure and easy maintenance |
Low purity, low flow rate (fish pond oxygenation) |
Automation Control
- Desktop and mobile-accessible dashboards designed for centralized gas operators, managing multiple regional air separation units (ASUs) simultaneously.
- Instant alerts for critical parameters (purity, flow, pressure, temperature) to prevent product gas contamination or system overpressure.
- Automated storage of historical operational data, pre-formatted to meet environmental and industrial compliance audit standards.
- Fully compatible with major plant-wide control systems for large-scale industrial facilities and complex EPC project infrastructures.
- Over 70% of software-related issues resolved via secure remote access, eliminating international technician dispatch delays.
After-Sales Support
- 24/7 Technical Support Hotline – Direct access to trained engineers for troubleshooting and guidance, reducing unplanned downtime.
- Rapid Spare Parts Delivery – Critical components shipped within 72 hours across EU & North America to maintain continuous operation.
- On-Site Service & Training – Certified technicians provide hands-on maintenance, commissioning support, and operator training.
Certifications & Compliance
- ASME U Stamp (Sec VIII Div.1): Pressure vessels stamped for fast approval in North American and Middle Eastern EPC projects.
- CE Marking (PED 2014/68/EU): Compliance for cryogenic valves, piping, and vessels, ensuring smooth EEA safety approvals.
- ISO 9001:2015 Quality: Standardized execution across engineering, certified welding, run-tests, and turnkey documentation.
- ATEX Hazardous Area: Explosion-proof electrical and instrumentation design for oxygen-enriched and hazardous zones.
- ISO 13485 Medical Gas: Engineering and traceable materials documentation for healthcare infrastructure and medical oxygen compliance.
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