Small air separation FAQ - DEAR Air Separation

Small air separation units start-up operation accumulation

Liquid accumulation stage essentials: ensure that the two expansion machine pressure before the machine is stable, maintain the highest permissible speed, so that it runs at full load. When the condensing evaporator liquid oxygen liquid surface, should promptly close the small oxygen flow to the normal flow of about 1/3, control the upper tower pressure, and gradually close the small liquid nitrogen throttle valve to full shutdown. Timely adjust the amount of air into the tower, to ensure that t...

Mar 22, 2022

Self-cleaning air filter in small air separation unit

(1) In the box combination installation, the combined part of the clean air chamber should pay attention to. (2) welding form must be the net air chamber around the welding of the sealing welding in small air separation unit(i.e. full welding), no intermittent welding. (2) If the combination of gasket in the middle of the chamber is used, the bolts and nuts of the combination should be tightened. and sealed by injecting glass glue at the seam of the splice. (3) When installing the filter...

Mar 21, 2022

The structure of the water cooling tower selected for small air separation unit has the following broad types

Sieve plate tower. Tower plate using aperture and hole spacing of the larger shower drop tower plate. Nitrogen and water are from the sieve hole through. As the water cooling tower is not working continuously and steadily, the cooling effect is not ideal, so it is no longer used. Cyclone plate. It consists of several metal structure of the cyclone tower plate, this type of structure resistance is very small, will not damage, has been used for quite a long time as an improved type, but the heat ...

Mar 18, 2022

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

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