Small air separation FAQ - DEAR Air Separation

The upper tower pressure of the two-stage distillation tower of small air separation unit

The lower the upper tower pressure, the more conducive to the separation of oxygen and nitrogen, and for the full low pressure air separation unit, the lower tower pressure will also be lowered as the upper tower pressure is reduced, and the lower tower pressure can reduce energy consumption. The pressure at the top of the upper tower depends on the resistance of the nitrogen piping in the heat exchange equipment and the resis...

Dec 24, 2021

Bed height of the adsorbent in small air separation unit

With a certain amount of adsorbent, the height of the adsorbent must not be less than the length of the adsorption zone. This is because when the adsorbent bed height is lower than the length of the adsorption zone, the adsorber will be switched on and the adsorption capacity will be small or even zero. At this point it is necessary to reduce the adsorption cross section and increase the bed height to increase the adsorption capacity. But...

Dec 22, 2021

Solutions in pressure adsorption membrane separation for small air separation unit

Membrane separation is a technology that uses separation membranes as the core for the selective separation, concentration and purification of substances. The basic principle is to use the different rates of dissolution and diffusion of each gas component in the separation membrane at a certain pressure, and therefore the different rates of permeation through the fibre membrane walls due to the partial pressure d...

Dec 21, 2021

The principle of gas throttling in small air separation unit

The throttling of gases is a process of equal enthalpy, i.e. throttling is simply a transformation between the internal energy of the gas and the work of propulsion, which includes internal potential energy and internal kinetic energy, while the temperature of the gas is only related to internal kinetic energy. The pressure of a gas is reduced after throttling, its mass volume increases and its internal potential energy always increas...

Dec 20, 2021

VPA catalytic reaction for the removal of small air separation unit

Gases obtained from coal as raw material may contain large amounts of carbonyl sulphur cos content too high (e.g. >20ppm) into the PSA small air separation unit will affect the quality of the product and the service life of the adsorbent molecular sieve. Common desulphurising agents are less effective in removing cos at room temperature, high temperature desulphurising agents (e.g. ferromanganese desulphurising agent...

Dec 16, 2021

How to determine whether the molecular sieve purifier in small air separation unit is working?

properly based on its adsorption temperature curve If the air pre-cooling system is working properly, the temperature of the air into the molecular sieve purifier will not change and the adsorption temperature curve is basically a straight horizontal line. The temperature of the air out of the adsorber is slightly higher than the inlet temperature due to the exothermic effect of adsorption, and is also...

Dec 15, 2021

What are the precautions in the use of oil coolers for air separation unit？

The following matters should be noted in the use of the oil cooler. 1.Check the oil cooler and the system coupling to be tight, and check all accessories and observation instruments. 2.Before using the oil cooler, to exhaust treatment, loosen the front cover (or back cover) and the screw plug on the shell, slowly pass into the water and oil, when the screw plug has water or oil overflow, respectively, and ...

Dec 15, 2021

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

Dec 14, 2021

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,...

Dec 13, 2021

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...

Dec 10, 2021

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...

Dec 09, 2021

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...

Dec 08, 2021

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