Small air separation FAQ - DEAR Air Separation

what is purification system in small air separation unit？

The molecular sieve on the air separation is currently used more 13X-APG type molecular sieve. The process principle is to use the internal porosity of its particles, and has a strong affinity for polar molecules, selective adsorption of carbon dioxide, water, and some hydrocarbons and other impurities. Activated alumina has high compressive strength, low abrasion rate, no pulverization, no bursting, etc. Its resistance to sudden changes in cold and heat is also very strong, and it also has bett...

Mar 02, 2022

What are the main measures taken for the design of oxygen pipelines in small air separation unit?

The main measures taken for the design of oxygen piping in small air separation unit. 1、The piping material of the high-pressure oxygen gas pipeline is made of stainless steel to reduce the possibility of iron oxidation and combustion under intense working conditions. 2、Partial commercial flow rate piping using copper brocade alloy (Monel); 3, the use of different conditions of the pipeline proposed different degreasing and cleanliness requirements in the selection of Tong expansion joint for...

Mar 01, 2022

What are air-opening and air-closing membrane control valves in small air spearation unit?

When there is no pressure signal input, the valve is closed; when there is a pressure signal, the valve starts to open, and the larger the input signal, the larger the valve opening, this kind of film regulating valve is called air-opening film regulating valve in small air spearation unit. When there is no pressure signal input, the valve is fully open, and when there is a pressure signal input, the valve starts to close; the larger the input signal, the smaller the valve opening; when the inp...

Feb 28, 2022

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...

Feb 25, 2022

Small air separation unit upper tower installation

Upper tower and main condenser assembly in small air separation unit Assembly using wind, electric tools to cut away the test pressure blind, or head with aircraft methods to clean up the welding area; according to the chart processing bevel, the site preparation scaffolding must be safe and solid, welders should be in accordance with the provisions of T4734-22 qualified by examination, group positioning welding and formal welding are used for two people at the same time double-sided cross-weld...

Feb 24, 2022

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

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