Small air separation FAQ - DEAR Air Separation

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...

Feb 23, 2022

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...

Feb 23, 2022

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...

Feb 21, 2022

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...

Feb 18, 2022

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...

Feb 17, 2022

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...

Feb 16, 2022

Nitrogen Circulation Pressurization Process in Small Air Separation Unit

The raw air is passed through an air filtration system to remove dust and mechanical impurities, and the filtered air is compressed by a multi-stage turbocompressor with an intercooler to the required pressure for the process. The compressed air is cooled and cleaned by two layers of cooling water in an air cooling tower of small air separation unit. Chemical impurities in the compressed air that are soluble in water are also absorbed by the falling cooling water cleaning. The remaining impuriti...

Feb 14, 2022

Copper plate welding methods in small air separation unit

1, gas welding of purple copper plate: welding purple copper plate is most commonly used for butt joints, lap joints and ding joints are used as little as possible. Gas welding can be used in two kinds of welding wire, one containing deoxidizing elements, such as wire 201, 202; the other is the general purple copper wire and the cutting strip of the parent material, using gas 301 as flux. Gas welding purple copper should be used when the neutral flame. 2, manual arc welding of purple copper: in...

Feb 11, 2022

How to determine whether the heating regeneration of molecular sieves in small air separation unit?

The required steam pressure, flow rate, etc. should meet the process design requirements when the molecular sieve is heated. The heating regeneration process in small air separation unit can be judged by the regeneration temperature curve. In the unloading stage, the adsorption capacity of the molecular sieve decreases due to the pressure drop, and some of the water and carbon dioxide molecules originally adsorbed are desorbed, and the temperature drops. In the heating stage in small air ...

Feb 10, 2022

Nitrogen cycle pressurization variable load process in small air separation unit

This project we use nitrogen booster cycle in the design process of oxygen compression fast variable load process. The process in small air separation unit before the air leaves the molecular sieve is the same as the conventional process, and the air after leaving the molecular sieve purification unit is cooled in the main heat exchanger and then enters the pressure tower. The flow of the nitrogen booster cycle is ...

Feb 09, 2022

Full Tower Efficiency of small air separation unit

We calculate the number of plates assuming that the liquid and vapour on each plate are interacting to reach equilibrium. In practice, it is not possible to achieve an ideal equilibrium for all plates in a nitrogen distillation column, so the actual number of plates required is greater than the theoretical number of plates required. The ratio of the theoretical to the actual number of plates is the full tower efficiency. Factors affecting the full tower efficiency are: the gas phase and liquid p...

Jan 28, 2022

Why do molecular sieves in small air separation unit use bunk beds?

Why do molecular sieves in small air separation unit use bunk beds? Molecular sieve purifiers are used in both small and large air separation plants to purify the air. carbon dioxide, acetylene, and various hydrocarbons. Some molecular sieves small air separation unit use a double bed because the adsorption capacity of activated alumina is relatively large for air with high water content, but as the water content of the air decreases, the adsorption capacity decreases rapidly. The molecular s...

Jan 26, 2022

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