Small air separation FAQ - DEAR Air Separation

Instrument tube welding measures in small air separation unit

(1) argon arc welder must have a pressure vessel welder qualification certificate, no permit personnel are strictly prohibited to weld. (2) in order to effectively control the speed of heating of the welded parts, should be used as far as possible to break the arc method of welding, welding wire diameter selected towel 3mm, while welding current should be given strict control, such as towel 12 * 2 instrumentation pipe joints recommended to use 60 ~ 80 amps welding current, the maximum should no...

Jul 03, 2026

Small air separation unit packed tower flow conditions of emulsification conditions

According to the different spraying speed of liquid and gas flow rate, the flow condition of packed tower can be divided into five kinds, which is the emulsification condition when the spraying speed and airflow speed reaches a certain value, gas, liquid, mixed violently, the formation of gas-liquid emulsion difficult to separate. The emulsification condition has the largest gas and liquid contact area, heat and mass exchange condition is the best. The operation of the packed tower of small...

Jun 24, 2026

What constitutes the refrigerating capacity of an air separation unit?

Jun 15, 2026

Heat transfer temperature difference for main cooling in small air separation unit

In the condensation evaporator the liquid oxygen is heated to evaporate and the gas nitrogen is cooled and condensed. Both the liquid oxygen and the gas nitrogen are in a saturated state. If the saturation temperature of nitrogen is lower than the saturation temperature of oxygen at the same pressure, the purpose of condensing gas and nitrogen with liquid oxygen cannot be achieved. For this reason the heat transfer temperature difference in the condensing evaporator must be established by the pr...

Jun 05, 2026

Liquid holding capacity of packed and sieve plate towers of small air separation unit

When using sieve plate towers for distillation, the liquid must be covered with a certain height of liquid layer in order to exchange heat and mass with the rising gas. In contrast, a packed tower only needs to wet the packing surface to form a liquid film for heat and mass exchange. Therefore, the liquid holding capacity of a packed tower is much smaller than that of a sieve plate tower, and the packed tower can also establish distillation conditions more quickly. The Henan Province Air Separa...

May 28, 2026

Measures to avoid cavitation in centrifugal pumps of small air separation unit

The cavitation of centrifugal pumps is very harmful. It causes great stress on the surface of the impeller and also reduces the head of the pump of small air separation unit, increases the power and reduces the efficiency. Therefore, measures should be taken in the process of use to avoid cavitation as far as possible. In order to avoid cavitation of small air separation unit, in the process design, should make the liquid into the pump before a certain degree of subcooling, while the pum...

May 26, 2026

What are the principles and characteristics of cryogenic air separation nitrogen production?

May 18, 2026

What is the working principle of cold box of air separation equipment?

May 09, 2026

Inspection of the pipeline in small air separation unit

Before installing pipe , check the orientation of the container orifice, the orientation of the valve inlet and outlet is correct. The pipe fittings should be thoroughly cleaned ten net and strictly degreased, while opening the welding bevels etc. The welded pipe must be brushed with clean stainless steel wire for a very short time before welding. In order to reduce the cold box pipe welding mouth, can be prefabricated in a clean plant, and later for the final distribution. Piping principles, f...

Apr 22, 2026

Installation of the molecular sieve purification system of small air separation unit

(1) The base of the two supports must be on the same level, ensuring that the 4 mark lines on the outside of the vessel's simplified orientation at both ends are level (2) Horizontal adsorber movable support: after the installation level is adjusted, the first nut on the support is tightened and then backed up one turn, then locked with the second nut (3) After the horizontal adsorber is in place, the level of its internal orifice plate <10mm is tested to confirm the level of the marker bar...

Apr 14, 2026

Why do air separation equipment remove impurities in the air?

Apr 03, 2026

Pre-installation inspection of the pipeline of small air separation unit

Pipe of small air separation unit before installation, check the orientation of the container orifice, the orientation of the valve inlet and outlet is correct. The pipe fittings should be thoroughly cleaned ten net and strictly degreased, while opening the welding bevels etc. The welded pipe must be brushed with clean stainless steel wire for a very short time before welding. In order to reduce the cold box pipe welding mouth, can be prefabricated in a clean plant, and later for the final dist...

Mar 26, 2026