Small air separation FAQ - DEAR Air Separation

Advantages and disadvantages of the accumulator of small air separation unit

The accumulator is a heat exchanger that transfers hot and cold airflow through a filler as a medium. When the cold airflow passes through the accumulator, the cold is stored in the filler and the airflow is heated, and when the hot airflow passes through the accumulator, the airflow takes the cold from the filler. It has the advantage of being simple in structure, low resistance and not easily blocked. The disadvantages are high switching...

Dec 27, 2021

No pressure in the cylinder before starting the air compressor of small air separation unit

According to the starting characteristics of the motor towing the air compressor, when the air compressor is started, its starting current is several times the current in operation. Too much starting current can have a negative impact on the machine itself, the transformer and the transmission line, so we should try to shorten the starting time and the starting current. However, if pressure exists in the cylinder before the ...

Dec 27, 2021

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