Small air separation FAQ - DEAR Air Separation

Appearance design of a complete set of process piping for small air separation units

The internal design of the adsorption tower assembly with pressurised screw device and the design of the quick-insert gas pack seal guarantees its gas tightness. In the process of the adsorption tower working under pressure, the upper plate is effectively pressed. This prevents the molecular sieve from being pulverised due to the movement of the upper plate. The compression screw is a trapezoidal threaded screw and matching nut. The compression screw is manually operated when it is still a mecha...

Jun 01, 2022

The performance of small air separation units main heat exchanger influence factors

The main heat exchanger is the key equipment to ensure the performance of small air separation units, affecting its performance mainly in the following areas.1, expander efficiency: air compressor exhaust volume is the process is given, the expansion air volume increases, the amount of positive flow air is reduced, so that the main heat exchanger cold end of the thermal load is reduced, the cold volume moved up to the hot end, the hot end of the cold excess, it will cause the main heat exchanger...

May 31, 2022

Hydrogen build-up in aluminium vessels for small air separation units

1 For all aluminium closed vessels (including water coolers with aluminium fins), the nitrogen seal should be confirmed before cutting the orifice on site and the hydrogen content at the upper orifice should be measured to see if it is within the normal range. Before cutting, the nitrogen seal nut should be gently unscrewed to release the nitrogen seal pressure and air must be kept circulating at the release site. After the nitrogen has been released, dry air should be used to displace any hydro...

May 30, 2022

The small air separation unit industrial application design

At present, all types of small air separation units, large air separation units and liquid air separation plants has been widely used successfully in all walks of life, domestic manufacturers of similar products are increasing, these new manufacturers are large and small, varying in size, and all have their own highlights, the industry as a whole mainly to meet the needs of users with gas as the main premise, reduce the price to obtain the market, but the overall control performance of domestic ...

May 27, 2022

Energy saving measures for each system of small air separation units

1, air cooling tower and water cooling tower using Bauer ring packing to bear the air, waste nitrogen and cooling water heat transfer carrier, which has a large flux, low resistance, high separation efficiency, operating flexibility and other characteristics. In the water-cooled tower, it makes full use of the cooling capacity of the recycled waste nitrogen to reduce the temperature of the chilled water before it enters the chiller, reducing the electrical load of the chiller.2, large air separa...

May 26, 2022

Safety of small air separation unit cryogenic liquid gasifiers

Cryogenic liquid gasifiers such as liquid oxygen, liquid nitrogen and liquid argon are used in liquid gasification stations for direct gas supply or bottle filling. To ensure safe operation, set up safety control points and pay attention to the following matters.1) Set up low temperature control interlock points for cryogenic liquids out of the gasifier to control the gas outlet temperature at 5 to 30°C. When the outlet temperature is below 0℃, the liquid pump will be automatically cut off a...

May 25, 2022

The small air separation unit mist entrainment

As the gas rises through the small holes to the upper plate, it always entrains the liquid from the lower plate. The oxygen content of the liquid on the upper plate is lower than that on the lower plate, so this phenomenon will offset some of the distillation effect. The amount of mist entrainment should not exceed 10%, more than that will damage the distillation process. Tower plate spacing and air velocity is the main factor affecting the fog froth entrainment. Operation of air separation equi...

May 24, 2022

The small air separation unit cold box overall repair

The small air separation unit maintenance workers decided to temporarily shut down, export the gas in the tower, two argon pump cold box after picking sand, check the argon pump cold box in the liquid argon and to coarse argon tower valve, the valve after the indentation at the crack opening, low pressure system cold gas leakage. The inspector Personnel wrapped with non-woven cotton, the main tower to maintain a slight positive pressure, for local heating of the liquid argon pump after the main ...

May 23, 2022

Overhaul of condenser of small air separation units

1 main exchange cold box and the main cold box between the partition, process pipeline through the partition using the insulation plate plus wool felt cold way, its poor cooling effect, resulting in the partition, column channel steel frost cracking. So the workers changed to open DN600 hole on the partition plate plus stainless steel collar, the collar with foam foam to keep cold, welding reinforcement of frozen cracked channel steel branch.2 original process pipeline fixed using stainless stee...

May 20, 2022

The small air separation unit pressure leak detection

Due to the age and disrepair of the small air separation unit, the cold box outside the pipeline and flange, valve connections have external leakage phenomenon. This part of the trace leakage for the normal operation of the small air separation unit is not significant, but for the gas tightness of the pressure test has a significant impact. Purified air, booster air.O2, N2, WN in and out of the cold box main exchange cold box flange is the internal thread connection method, not easy to disassemb...

May 19, 2022

What preparatory work is done before the start-up operation of the fractionation tower system of the small air separation unit?

The start-up operation of the fractionation tower of a small air separation unit is crucial. During the start-up operation, the logistics, temperature and pressure in the system change dramatically. Before the small air separation unit start-up operation must be completed before the preparation work. 1, in accordance with the requirements of the technical conditions for the installation of small air separation unit to test and test qualified. 2, air purification system switching mechanism is c...

May 18, 2022

Instrument replacement for small air separation units

Small air separation units workers check out the cold box aluminum instrumentation tube and instrumentation valve before the corrosion of the aluminum joint, the site identified the replacement of 33 new valves. 1 The original fine argon tower exhaust gas discharge pipe out of the cold box with vaporizer, vaporizer close to the cold box caused icing, the cold box plate corrosion serious. The small air separation unit overhaul team removed the carburettor and replaced it with a st...

May 17, 2022

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