Small air separation FAQ - DEAR Air Separation

What requirements should be met when assembling gauge tubes and cold boxes for small air separation unit?

Apr 16, 2025

VPS ambient temperature desulphurisation of toxic substances in small air separation unit

The raw gas for variable pressure adsorption contains H2S, which needs to be removed if it is greater than 20 ppm, taking into account the life of the adsorbent and the quality of the product. the removal of H2S can be done by a dry desulphurisation process using a fixed bed with a room temperature iron oxide desulphurising agent inside. Desulphurisation towers can usually be set up as two or more,...

Apr 08, 2025

What are the considerations for the maintenance of oil coolers for small air separation unit?

There are several considerations for the maintenance of the oil cooler as follows. 1.The cooling water is purified fresh water. 2.To prevent scaling and improve the heat transfer coefficient, the cooling water temperature should be as low as possible and the water flow rate should be as large as possible. 3.In the cold season, in order to prevent the cooler heat transfer tube from freezing a...

Mar 28, 2025

VPS VTA in small air separation unit

VPS VTA in small air separation unit Variable temperature adsorption is an operating method that uses the equilibrium adsorption capacity of the adsorbent to decrease with increasing temperature, using ambient temperature adsorption and rising temperature desorption in small air separation unit. Two or more adsorption towers are usually set up to operate in cycles to achieve continuous production, with one (or several) adsorbing impurities near ambient temperature and the others staggering thro...

Mar 20, 2025

The purpose of water cooling tower of small air separation unit

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 not easy to scale. In l...

Mar 12, 2025

What kinds of water cooling towers are available for small air separation unit？

The structure of the water cooling tower selected for air separation equipment has the following broad types. Sieve plate tower. Tower plate using aperture and hole spacing of the larger shower drop tower plate. Nitrogen and water are from the sieve hole through. As the water cooling tower is not working continuously and steadily, the cooling effect is not ideal, so it is no longer used. Cyclone plat...

Mar 04, 2025

Principle, prime movers and attachments of centrifugal compressors for small air separation unit

Centrifugal compressor is a kind of turbine compressor, with more characteristics such as handling gas volume, small size, simple structure, smooth operation, easy maintenance and gas is not oil pollution, can be used in the form of drive. Centrifugal compressor principle of operation, the main goal of increasing gas pressure is to increase the number of gas molecules per unit volume, that is, to s...

Feb 24, 2025

What are the requirements for strength and airtightness tests before the small air separation unit is put in place?

Small air separation unit in place before the strength test and gas-tightness test provisions. First, if the manufacturer has made strength test and has a certificate of conformity of the pressurized equipment, it may not be strength test only gas tightness test, but if the small air separation unit is found to have traces of damage or a site has been partially mo...

Feb 14, 2025

How to test the piping systems pressure of small air separation unit?

Pressure testing ofsmall air separation unit and piping systems requires pressure testing in different sections, divided into two sections: inside the cold box and outside the cold box. Pressure test of the internal piping of the cold box: the system is tested by air pressure and the medium is dry, oil-free air. The test must be carried out by a dedicated partition responsible for strictly and carefully check...

Feb 07, 2025

What issues should be noted during the operation of the molecular sieve purification system for small air separation unit?

When operating the molecular sieve purification system: pay attention to the installation requirements of the molecular sieve absorber, when the molecular sieve absorber is running, when the working state of the refrigerator, when the air compressor starts, when thesmall air separation unit is parked, pay attention to the working state of each piece of equipment. 1...

Jan 21, 2025

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