Small air separation FAQ - DEAR Air Separation

Why small air separation unit piping should be subjected to some degreasing, cleaning and drying？

Given the high sensitivity of oxygen piping to combustibles, piping cleanliness of small air separation unit is an important part of quality control for oxygen piping installations and is subject to the most rigorous degreasing, cleaning and drying treatments. The interior of the pipework should be free from the accumulation of moisture, cleaning agents, particles, organic oils, grease and adhesives, paint and record pen marks and other debris etc. If there is metal debris or grit in the pipe, ...

Mar 11, 2022

The filling of the adiabatic material of the small air separation unit

Before filling with pearlescent sand. Seal all the holes. The flanges inside the cold box are tied with glass fibre tapes and all temperature measuring lines and temperature-sensitive components in the cold box have good performance. It is strictly forbidden to build permanent scaffolding in the cold box, and it is strictly forbidden to use flammable and explosive materials to make permanent supports in the cold box. And should be completely removed from the cold box all temporary facilities ...

Mar 10, 2022

What are the factors related to the load regulation range of low pressure small air separation unit?

The load adjustment range of low pressure small air separation unit is related to the adjustment performance of the raw material compressor, the adjustment performance of the expander, the structural characteristics of the distillation tower and other factors. At present there are imported guide vane of the turbine air compressor flow adjustment range in 75-100%; adjustable nozzle of the turbine expander adjustment range can be in 65-100%. When oxygen is rich and the need to reduce oxygen produc...

Mar 09, 2022

Pressure testing of piping systems in small air separation unit

Pressure test of piping in the cold box (1) The system adopts air pressure test, the medium is dry and oil-free air. And must be responsible for the package by a dedicated person partition, strict and careful inspection of the leakage of each part, no leakage is allowed. (2) Before the pressure test, the butt welds of the pipeline should have been checked and qualified, and the valve position holes of all safety valves and automatic valves in the switching process should be blocked with blind ...

Mar 08, 2022

Stroke of the piston compressor valve gate for small air separation unit

The stroke of the valve plate of the piston compressor valve of the small air separation unit should be reasonably selected according to the speed and pressure of the compressor and should not be too large or too small. If the valve stroke is too large, the valve blade may not open fully and may also close with a hysteresis due to the inertia of the moving parts. At the same time, if the stroke is too large, it will increase the speed of the valve blade when opening and closing, and the impact o...

Mar 07, 2022

What are the factors related to the load regulation range of low pressure small air separation unit?

Mar 04, 2022

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

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