Liquefied air separation FAQ - DEAR Air Separation

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

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...

May 15, 2025

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...

May 07, 2025

What are the main applications of throttling effect refrigeration capacity in air separation equipment?

Apr 21, 2025

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...

Apr 11, 2025

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...

Apr 02, 2025

Cryogenic distillation process of liquid air plant in Nitrogen and Oxygen

After refrigeration, of course, liquid air can be used as the cooling source to provide the condenser with cold quantity to organize the deep cooling air separation process. However, it is difficult to choose heating to reboiler. Most of the commonly known substances are solid state and cannot be used as heat carrier under the condition of deep cooling. Of course, electric heating is not available,...

Mar 17, 2025

Low air compressor efficiency of large air separation unit

Grid frequency or voltage drop Combined with the compressor machine side voltage meter and electrical system background microcomputer found that during the operation of the compressor grid voltage and frequency are not significantly decreased, the external network power supply system is more stable, so the motor and compressor speed is judged to be a constant value. Increase in suction temperature at any level When the suctio...

Mar 07, 2025

Why can the lower tower of the distillation column of a small air separation unit not pump dirty liquid nitrogen?

Oxygen generators are switchable heat exchanger process oxygen generators and molecular sieve pressurised expansion process oxygen generators. The pure liquid nitrogen supplied to the upper tower is less and a stream of dirty liquid nitrogen can be pumped to the upper tower. The oxygen generator of the pressurised expansion process, b...

Feb 27, 2025

Calculation of minimum reflux ratio

The process of stripping is a process of continuous exchange between the high boiling point components in the rising gas and the low boiling point components in the reflux liquid. As a result, the high boiling point components in the rising gas are continuously reduced until the top of the stripping section reaches the gas phase composition of the distillation raw material. Meanwhile, the low boiling point components in the reflux liquid are continuou...

Feb 19, 2025

Minimum gas-liquid ratio in liquid air separation plant

In fact, reflux ratio is a conventional saying. In practical calculation, it is divided into liquid gas ratio in distillation section and gas-liquid ratio in stripping section. The minimum reflux ratio is of course the same. When the number of trays and reflux ratio determine the purity of distillation products, the actual meaning is that the gas-liquid ratio of the stripping section and the number of trays in the stripping section determi...

Feb 11, 2025