Liquid air fractionation is widely used in industrial large-scale production of liquid oxygen machines
The critical temperature of oxygen is 154.58K (that is, -118.57℃), and the critical pressure is 5.043MPa, so the manufacture of liquid oxygen must be below the critical temperature and above the critical pressure.
Cryogenic Liquid Oxygen Production Plant
Industrial production of oxygen The liquid air fractionation method is widely used in industrial large-scale production of oxygen. First, the air through the filter to remove dust and other solid impurities, into the compressor compression, and then through the molecular sieve purifier to remove water vapor and carbon dioxide and other impurities gas. Here the molecular sieve can allow smaller molecules such as nitrogen and oxygen to pass through and play a role in screening molecules. When the temperature drops to about -170 ° C, the air begins to partially liquefy into the rectification tower, and fractionation is carried out according to the different boiling points of the gases in the air. Liquid oxygen has a higher boiling point than liquid nitrogen, and the two vaporize more easily than liquid nitrogen. More than 99% pure oxygen can be obtained by multi-step fractionation, and nitrogen and raw materials for extraction of rare gases can be obtained. This method is complicated. If the purity of oxygen is not high, the air can be separated by molecular sieve adsorption to produce oxygen. The adsorption capacity of specific molecular sieve for nitrogen is larger than that of oxygen, when the air passes through the molecular sieve bed, the oxygen content of the outgoing gas is higher, and the gas containing oxygen can be obtained by repeated adsorption of 70-80%. This method is normal temperature operation, short cycle, easy to automate. In addition, if high purity oxygen is needed, electrolytic water can be used for production, which is expensive and only suitable for small production. The oxygen separated from the air is usually stored under pressure in sky-blue cylinders for industrial, medical or other use.
The production process of liquid oxygen mainly includes the following steps:
Air filtration and compression: Firstly, the raw air is filtered to remove impurities and then enters the compressor for volume compression, with a pressure of about 3kg. Then, the compressed air is cooled to around -55 ℃.
Cooling and drying: Compressed air enters the water cooling tower for further cooling, while undergoing drying and re cleaning, and then enters the molecular sieve to remove harmful gases such as water vapor and carbon dioxide.
Liquefaction: The air treated with molecular sieves enters the main cooling and heat exchange equipment (tower), where the temperature drops to -120 ℃. A small portion of the air is pressurized by an expander and cooled to -200 ℃, forming liquid air.
Distillation: Liquid air enters the distillation tower for heating, and nitrogen with a boiling point of -196 ℃ first evaporates from the liquid air, leaving behind liquid oxygen (with a boiling point of -182 ℃).
Purification: If higher purity liquid oxygen is needed, further separation and purification processes are required.
The use of liquid oxygen: Liquid oxygen is widely used in industry and scientific research. For example, when a carrier rocket ascends, it carries liquid hydrogen as fuel and liquid oxygen as an oxidizer, and the two react to produce water. In addition, liquid oxygen is also used in medical, welding, cutting and other fields.
The physical properties of liquid oxygen: Liquid oxygen evaporates rapidly at room temperature, requiring special storage and transportation equipment. Its color darkens with increasing pressure and concentration, while oxygen darkens with increasing pressure and decreasing temperature.
Cryogenic Liquid Oxygen Plant Manufacturer
as a premier liquid oxygen generator manufacturer, designs efficient, user friendly and maintenance free plants. With fully automated systems, Lecten Gas Cryogenic Liquid Oxygen Plant guarantees trouble free operation.
Whether for medical oxygen or industrial oxygen needs, at Lecten Gas, we offer an ultimate solution in a liquid oxygen generation.
Plant Name: Liquid Oxygen Plant With Five Operating Modes
Characteristic:
1.Convenience of shift between gas and liquid mode
2.Fexible operation based on capacity adjustment of compressor
Mode 1:
| Product | Output(Nm3/h) | Purity |
| Liquid Oxygen | 500 | ≥99.6% O2 |
| Liquid Nitrogen | 300 | ≤3 PPm O2 |
| Gas Nitrogen | 1500 | ≤3 PPm O2 |
Mode 2:
| Product | Output(Nm3/h) | Purity |
| Liquid Oxygen | 450 | ≥99.6% O2 |
| Liquid Nitrogen | 350 | ≤3 PPm O2 |
| Gas Nitrogen | 1450 | ≤3 PPm O2 |
Mode 3:
| Product | Output(Nm3/h) | Purity |
| Liquid Oxygen | 715 | ≥99.6% O2 |
| Liquid Nitrogen | 0 | ≤3 PPm O2 |
| Gas Nitrogen | 1500 | ≤3 PPm O2 |
Mode 4:
| Product | Output(Nm3/h) | Purity |
| Liquid Oxygen | 0 | ≥99.6% O2 |
| Liquid Nitrogen | 840 | ≤3 PPm O2 |
| Gas Nitrogen | 1150 | ≤3 PPm O2 |
Mode 5:
| Product | Output(Nm3/h) | Purity |
| Gas Nitrogen | 1500 | ≤3 PPm O2 |