Liquefied air separation FAQ - DEAR Air Separation

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 ...

Feb 10, 2022

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...

Feb 09, 2022

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...

Jan 27, 2022

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...

Jan 25, 2022

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 ...

Jan 24, 2022

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...

Jan 20, 2022

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...

Jan 19, 2022

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 ...

Jan 18, 2022

What are the requirements for the design of piping in the cold box of liquid air separation plant?

What are the requirements for the design of piping in the cold box of liquid air separation plant? The design of piping in the cold box ofiquid air separation plant is complex and troublesome, and each pipeline has its own process requirements. As one of the most complex components in the cold box of air separation equipment, low temperature piping is the key to ensure the stable and safe operation of small air separation unit. A set of air separation equipment in the cold / hot end of the plat...

Jan 17, 2022

What are the requirements for the construction of piping for liquid air separation plant?

Before installation of piping for liquid air separation plant, oxygen piping should be subjected to strict acid cleaning and degreasing in accordance with the national standard "Safety Technical Regulations for the Production of Oxygen and Related Gases by Deep Freezing", and then blown clean with dry air or nitrogen without oil. When the oxygen pipeline has not been put into operation for a long time after installation and construction, it should be protected with dry gas to prevent hu...

Jan 12, 2022

Application of auxiliary condensing evaporator in liquid air separation plant

Auxiliary condensing evaporator in liquid air separation plant is the device to remove acetylene and hydrocarbons from the condensing evaporator. In the condensing evaporator, liquid oxygen is continuously evaporated, while acetylene and other hydrocarbons contained in liquid oxygen are continuously concentrated. A part of the liquid oxygen is led from the bottom of the main cold evaporator, this part of the liquid oxygen evaporates in the auxiliary condensing evaporator and the acetylene and ot...

Jan 11, 2022

How to make liquid oxygen in small air separation unit？

Small air separation unit is the unit that separates air into oxygen and other gases by first compressing and cooling the air into a liquid state and then using the characteristic that oxygen has a different boiling point to other gases in the air to obtain oxygen and liquid oxygen by evaporation and separation, as well as other rare gases as required.Liquid oxygen is produced using the cryogenic separation of air. The basic principle is to u...

Dec 24, 2021

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