Small air separation FAQ - DEAR Air Separation

What are the benefits of 4-5% argon fraction be used as distillation feedstock in the small air separation unit?

First of all, it completely conforms to the general principle of distillation organization and simplifies the organization of air separation distillation. Secondly, after the air separation distillation is organized in this way, the argon component in the air is almost completely in the oxygen argon mixture at the bottom of the air separation column, which is greatly conducive to the improvement of nitrogen ...

Jan 13, 2025

The amount of carbon dioxide with a small air separation unit

The volume fraction of carbon dioxide in air is generally around 0.03%, if the air compressor compresses the air to 0.62 MPa, the partial pressure of carbon dioxide can be calculated as 186 Pa. At the temperature when the air enters the air separation device, the saturated vapor pressure of carbon dioxide is much higher than the partial pressure of carbon dioxide, so carbon dioxide is in an unsaturated state, and carbon dioxi...

Jan 03, 2025

Why does the temperature of gas throttling in small air separation unit decrease？

In the small air separation unit, when gas or liquid flows through a shrinkage hole or valve in the pipeline, the flow will be hindered, and the fluid will produce vortex collision, friction and other resistance at the shrinkage hole or valve. In order to flow through the shrinkage hole or valve, the resistance must be overcome, showing that there is a pressure difference before and after the shrinkage hole...

Dec 25, 2024

Harm of liquid drop in small air separation unit turbo expander

If the air temperature in the small air separation unit expander is lower than the liquefaction temperature corresponding to the local pressure, part of the gas will liquefy and droplets will appear in the expander. However, the rotating speed of the working wheel of the turbo expander is very high, and the droplet impact on the impeller will cause the impeller surface wear. The droplets may also be thrown to the gap ...

Dec 17, 2024

Energy consumption of two column process in small air separation units

Air separation unit not only has the distillation and separation process of air under the condition of deep cooling, but also the process of keeping the air separation unit in the deep cold state and making the cryogenic liquid products. Therefore, in addition to distillation process, air separation unit has a very important refrigeration process. Unlike the general refrigeration process of heat pump, the refrigeration prin...

Dec 09, 2024

What technical parameters are required for designing small and medium-sized air separation equipment schemes?

Nov 29, 2024

How to operate the sudden power failure of small air separation units？

In case of sudden power failure during the operation of small air separation unit, the following steps should be followed: First, open the vent valve (anti surge valve) of air compressor to prevent the air compressor from surging and causing the air compressor to reverse due to air backflow; Then check whether the molecular sieve adsorber switch should be interlocked to close, if not, it should be man...

Nov 21, 2024

New single column process energy consumption in small air separation units

The classical single column process is the first one to be used in industrial application. However, there are many disadvantages in the classical single column process. One is that oxygen and nitrogen cannot be produced simultaneously, and the other is that the oxygen extraction rate can only reach about 70%. There are two improvement schemes to solve the defects of classical single column process. One is the curren...

Nov 13, 2024

What are the configuration options of high purity nitrogen in small air separation units?？

The configuration of the high purity nitrogen air separation equipment has the following aspects: 1、 Compressor unit configuration, for the reflux nitrogen plant, the compressor discharge pressure is generally 5-10bar. When the unit is large in scale and the product pressure is high, the product nitrogen compressor can be set separately; For the positive flow expansion nitrogen plant, when the scale i...

Nov 05, 2024

Argon extraction from double column process in small air separation unit

At present, the crude argon condensing column process is used in the double column process. The rigid connection between the main stream process and the argon extraction process is artistic both in design and operation. If there is a slight difference, it will be a thousand miles away. Secondly, to achieve the oxygen content index, the number of theoretical plates is 200, which has reached the limit of the project. ...

Oct 28, 2024

Operation method of improving oxygen extraction rate in small air separation

In the operation, the methods to improve the oxygen extraction rate are as follows: when the potential of upper column distillation is allowed, all the expanded air is sent to the upper column as far as possible; When the oxygen purity reaches the standard or meets the needs of users, increase the amount of oxygen taken out; Try to improve the average nitrogen purity or reduce the oxygen content of sewage nitrogen; As far as possible ...

Oct 18, 2024

How to optimize the structure of the equipment support in the cold box of an air separation plant?

Oct 11, 2024