Liquefied air separation FAQ - DEAR Air Separation

What are the causes of molecular sieve water ingress accidents of liquid air separation plant?

Causes of molecular sieve into the water accident: when the air-cooled tower level is higher than 3500mm water exceeds the height of the air inlet tube, a large amount of water with the air into the molecular sieve adsorber; when the air-cooled tower resistance rises, higher than 7kPa, the air-cooled tower will form a liquid suspension, resulting in bottom water level fluctuations, air-cooled tower resistance fluctuations, water with the air into the molecular sieve adsorber; molecular sieve swi...

Aug 26, 2025

Composition of the liquid air separation plant

The liquid air separation plant includes the lower tower, upper tower, condensing evaporator, argon system, main heat exchanger, subcooler, liquefier and is placed in a separate cold box. After distillation in the lower tower, high purity nitrogen is obtained at the top of the lower tower, which is reheated by the main heat exchanger and then exits the cold box and goes to the nitrogen circulation system to recover the cold from the liquid air separation plant to make liquid nitrogen. The lower ...

Aug 18, 2025

Installation of piping outside the cold box of liquid air separation plant

(1) Can be based on the cold box outside the piping diagram provided by the equipment manufacturer and the relevant national standards and norms for industrial piping installation. For heavier weight valves, small lifting tools can be used to temporarily support them. When the piping is good, use fixed brackets to support. (2) Liquid discharge mains should be installed with compensation parts. (3) The aluminium pipe leading out of the cold box with its welded pressure plate and its seal ring s...

Aug 08, 2025

How to determine whether there is a leak inside the air separation equipment?

Jul 31, 2025

Purging of liquid air separation plant

The purpose of the blowing is to clean out the residual slag, aluminium chips and other debris from the piping and vessels. the air source for blowing is provided by the turbine compressor, and the air cooling tower must be activated. 3. blowing principle, first outside the tower, after the tower, blowing brush to be one after another, in the blowing with the air pressure: low pressure system. Should be maintained at 40 a 50kpa high pressure system: should be maintained at 250 ~ 400k...

Jul 23, 2025

Installation of pipes in the cold box in liquid air separation plant

Installation of pipes in the cold box in liquid air separation plant Stainless steel welding wire must be baked at the temperature strictly in accordance with the instructions for use and kept warm before use. Receive welding rod, welders must use the electrode insulation cylinder, and do a good job of anti-aluminium welding wire clean, dry and sealed packaging, otherwise chemical cleaning and drying treatment is required before use. Welding rod grades must be used uniformly and not mixed. Pr...

Jul 15, 2025

How to prevent water ingress into molecular sieves in air separation equipment?

Jul 07, 2025

Development of import and export of liquid air separation plant in China

Since 1956 China began to have an air separation equipment manufacturing industry, and constantly meet the growing demand for industrial gases from all walks of life, in view of the then poor technology and manufacturing capacity of gas separation equipment manufacturing products, many departments rely on imported equipment to develop the national economy, in the 1950s and 1960s China mainly imported ...

Jun 27, 2025

Precautions and factors of capacity ofoperating a booster expander in liquid air separation plant

capacity The following precautions should be taken in the operation of a pressurised expander： do not allow the interlock to be removed to start the expander under any circumstances. control the inlet temperature of the expander to be no lower than -118°C. It is not permitted to start the expander with the booster bypass valve FCV401 closed, and the expander should be pre-cooled befor...

Jun 19, 2025

LNG cold energy utilisation liquid air separation plant

Liquefied natural gas (LNG) contains a large amount of high-grade cold energy, which has a high economic value. With the current rapid growth of LNG users in China and the intensification of global energy supply constraints, the rational use of LNG cold energy is particularly important for energy conservation. As China's demand for LNG increases, more LNG receiving stations will be built in coastal areas, where LNG will be...

Jun 11, 2025

What is the role of molecular sieves in air separation equipment?

Jun 03, 2025

Issues of the development of import and export of liquid air separation plant in China

China's liquid air separation plant is widely used in metallurgy, petroleum, chemical industry, coal chemical industry, machinery, building materials and other areas of the national economy, the level of its development represents the strength of the country's economic development and also the level of industrial development, the import and export of liquid air separation plant has undergone a long journey from none to large. Since 1956 China began to have liquid air separation ...

May 23, 2025