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What is Cryogenic Liquid Oxygen Plant?

1. What is a Cryogenic Liquid Oxygen Plant?

In order to make low-temperature gas-filled cylinders, it is necessary to open up the high-temperature cylinder and fill the low-temperature cylinder with liquid oxygen. In order to achieve this, a cryogenic liquid oxygen plant is required.
In order to solve this issue, a new concept of cryogenic liquid oxygen plant was introduced. The principle of the cold gas filling machine includes a tank with liquid oxygen, and a low-temperature gas cylinder as well as a cold gas filling machine. When there is no problem in the filling process of low-temperature gas-filled cylinders, there is no need for a cryogenic liquid oxygen plant.


2. The Technical Problems of Gas Volatilization

Cryogenic liquid oxygen production is one of the most important processes in the industry, and it is a very sensitive process. For example, if the temperature drops below 0 °C (32 °F), there will be a rapid volatilization phenomenon, and the liquid oxygen fluid might get mixed into with other components such as nitrogen gas.
If this happens at the wrong moment (when the liquid oxygen tank is not ready to be filled), there would be a dangerous accident.
The existence of such problems has caused many gas cylinders to find their uses as cryogenic liquid oxygen-filling devices.
Nowadays, it is widely used in both domestic and commercial consumption industries for various applications. In addition to being cold enough for freezing water, liquid oxygen can also be used as a refrigerant in some steam boilers.
When filling gas cylinders with liquid oxygen, we need to pay attention to several important issues:

  • The inside of the gas cylinder must be cleaned first before filling with liquid oxygen;
  • The inside temperature of the gas cylinder must be monitored carefully;
  • Accurate measurement of pressure must be taken before filling;
  • A valve control system must be used so that when a pressure drop occurs inside a cylinder, it will not cause an explosion;
  • Oxygen must not be added until all air inside has been removed from the gas cylinder;

3. The Liquid Oxygen Filling Device

The liquid oxygen filling device of the low-temperature gas cylinder includes a liquid oxygen tank and a low-temperature gas cylinder.
The Liquid Oxygen Filling Device (LOF) is an innovative manufacturing process for the designing of low-temperature, high-pressure gas cylinders. Therefore, LOF is called a “cryogenic liquid oxygen plant” in this presentation.
The main function of LOF is to minimize gas volatilization when filling low-temperature gas cylinders. For example, the LOF can be used to fill air cylinders with air or helium without any special device needed for its filling. The LOF has a simple design including a container for the liquid oxygen tank and a container for a low-temperature gas cylinder. The LOH device has no special parts that need to be mounted on carriages or other equipment, which can make it more convenient than other devices that have complicated installation procedures such as welding or clamping.
In addition, it could also be applied in many other applications such as filling an oxygen tank with nitrogen or water to fill chemical containers, etc.

4. The Low-Temperature Gas Cylinder

There are several types of low-temperature gas cylinders (LTPs). In the past, LTPs have been produced from metals. In recent years, several plastics have been used for producing LTPs.
Cryogenic liquid oxygen plants (CLOPs) were first developed in the early 1990s. The first prototype has been in use since 1995, and more than 100 prototypes have been produced since then. They are now used for filling LTP cylinders at various locations, including on ships and containers. They are also used to fill containers of gas in chemical plants, factories, mines, and oil refineries.
After its invention, CLOPs were applied to different phases of production, such as filling chemical production cylinders; filling steel containers; and filling paper mills.


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