Large air separation FAQ - DEAR Air Separation

Safety issues in the manufacture of large air separation equipment

The instrumentation pipe for pure argon towers and crude argon liquefiers should be led on the tower closest to the cold box, the lead pipe needs to be upwards. If the outlet of the instrument tube on the cold box plate is lower than the tower outlet and liquid and gas seals have to be made, upward shrinkage of the vessel has to be considered. The protection angle should be reversed to avoid the line being cut by the protection angle when the instrument tube is contracted upwards. With the cont...

Jan 27, 2022

What is meant by refrigeration and cooling capacity in large air separation plants？

According to the laws of thermodynamics, heat can only be transferred spontaneously from a high temperature object to a low temperature object, while the inverse process cannot take place spontaneously. A temperature lower than the ambient temperature cannot be produced without special methods. Methods of obtaining low temperatures have been mastered through practice. The process of obtaining a low temperature ...

Jan 26, 2022

Installation of large air separation plant

The installation of large air separation plant is an important link between the design and manufacture of ASU and the start of production, The quality of the installation work of Dear Air Separation ensures the operational index and safety of the whole set of air separation equipment in the future. In recent years, domestic and foreign manufacturers have encountered due to the quality of the installation of substandard ASU users and equipment manufacturers caused significant economic losses on b...

Jan 24, 2022

Cleaning and degreasing of pressure vessels, valves and piping of large air separation plant

Cleaning and degreasing of pressure vessels, valves and piping of large air separation plant 1 All pressure vessels, valves and pipelines and their piping accessories must be clean, dry and free from oil and grease before installation. 2 Degreasing of aluminium parts (pressure vessels, valves and piping) is strictly prohibited by the use of carbon tetrachloride. 3 Carbon steel oxygen piping outside the cold box, valves and all other parts with oxygen, must be strictly degreased before install...

Jan 21, 2022

Rapid development of large air separation plant import and export in China

In 1994, we exported a set of 10000m³/h air separation plant to India Esar Steel Company, which adopted the new technology of the fifth generation of air separation, showing to the world that the design and manufacturing level of China's ASU reached the international level at that time, creating a precedent for the export of large air separation unit in China. The first large air separation plant exported in China, to achieve a zero breakthrough in domestic large air separation plant into t...

Jan 14, 2022

Isothermal throttling refrigeration in large air separation plant

Isothermal throttling refrigeration in large air separation plant Air can be reduced in temperature by throttling, isothermal throttling is an isoenthalpy process and does not produce cooling. If the gas is to be cooled by isothermal throttling, it is compressed by isothermal compression and expanded by throttling. The enthalpy of the gas decreases during isothermal compression and the work of the compressor and the enthalpy drop of the gas are transferred to the environment together as...

Jan 10, 2022

How to clean vessels, valves and piping of large air separation plant?

All pressure vessels, valves and piping of small air separation unit and the vicinity of the piping (in contact with oxygen or cryogenic media) must be clean, dry and free from oil and grease before installation. Equipment that has been degreased by the manufacturer and is not contaminated can be installed without degreasing; if it is contaminated with grease, it should be degreased. materials such as aluminium and ma...

Jan 07, 2022

How to prevent water ingress accidents in large air separation plant？

Water ingress can have the following phenomena: molecular sieve pressure fluctuates from high to low, the resistance of the adsorber rises, and the temperature profile changes after heating and cold blowing. The most obvious change is a drop-in temperature after cold blowing and the appearance of a flat-headed peak. The longer the distance between the curves of the flat-head wind, the more water is f...

Jan 06, 2022

What kinds of water cooling towers are available for large air separation plant？

A water cooling tower is a hybrid heat exchanger. The purpose is to cool the air after the temperature of the cooling water in the cooling tower to make the water temperature down, in order to be used for air cooling tower cycle. Different types of water cooling towers are seeking to enhance heat transfer, improve the cooling effect, while the flow resistance to be as small as possible, so that the water is ...

Jan 04, 2022

Advantages of Turbomachinery of large air separation plant

Advantages of Turbomachinery Dear Air Separation process simulation, 3D design, stress analysis, safety analysis and other software are among the best in the world, providing users with quality and advanced design services. Compared to piston expanders, turbine expanders have many advantages: the efficiency of turbine expanders is higher than that of piston expanders; when turbine expanders work, gas can pass through continuously and at high speed, and the smaller size can expa...

Dec 31, 2021

Water ingress accidents in large air separation plant

Before using the molecular sieve purifier, in order to reduce the temperature of the process air, the air must first enter the air-cooling tower for cooling. In the air cooling tower, the air enters from the bottom and is led from the top of the tower into the molecular sieve purifier, water is sprayed from the top of the tower to contact and mix with the air to cool the air, the air cooling tower is equipped with a number ...

Dec 30, 2021

The infuser of the expander of large air separation plant

The infuser nozzle of the expander commonly has two kinds, tight type nozzle and shrinkage expansion type nozzle, the gas flows through the nozzle, due to the shape of the nozzle will cause the flow rate of the gas to increase, the gas in the infuser does not receive external work, the kinetic energy increase can only rely on the consumption of internal energy, so the gas temperature will be reduced. For the gas, the pressure decreases, the volume flow rate also incr...

Dec 29, 2021

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