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...

Mar 03, 2022

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