Small air separation FAQ - DEAR Air Separation

Installation of the air pre-cooling system in small air separation unit

Installation of the air pre-cooling system in small air separation unit (1) Air cooling tower is a pressure vessel, the site is strictly prohibited on the tower body fire. (2) installation requirements: verticality <1/1000, the full length of the range shall not exceed 10mm. (3) loading material before, clear the tower debris and check the tower pieces of fasteners, confirm no loose, off. (4) bare cold before, air-cooled tower, water-cooled tower at the top of the screen mist trap again c...

Mar 16, 2022

Heat exchangers in small air separation unit are classified according to the principle of heat transfer？

Small air separation unit so that the heat from the hot fluid to the cold fluid air separation unit is called heat transfer equipment or heat exchanger. The main heat exchangers in small air separation unit are: nitrogen water pre-cooler, switchable heat exchanger, main heat exchanger, condensing evaporator, subcooler, liquefier, gasifier, heater and air compressor cooler. According to the principle of heat transfer can be divided into three categories and various types of characteristics are....

Mar 15, 2022

What are the requirements of welded steel pipes for small air separation unit?

Welded steel pipes, also known as seamed steel pipes, are generally made of steel sheets or steel strips rolled and welded. According to the surface treatment form of the pipe: divided into galvanized and ungalvanized two. The surface of galvanised white, also known as white iron pipe or galvanised steel pipe; the surface is not galvanised, that is, ordinary welded steel pipe, also known as black iron pipe. Galvanised welded steel pipes, commonly used for conveying media requiring cleaner pipel...

Mar 14, 2022

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

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