Small air separation FAQ - DEAR Air Separation

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

Samall air Separation Unit Crude Argon Tower Service Procedure

1 All pneumatic valves with a small holding tank, with a tie rod fixed to the box plate pulling diagonally on the cryogenic valve seat. According to the new specification all pneumatic valves, manual valves are all installed into the existing style of the valve frame - that is, the valve seat and valve before and after the valve pipeline are all fixed. 2 fixed the main tower, rough argon tower Chuan tower top of the three tie rods such as loose, be pulled tight, and review the verticality of ea...

May 16, 2022

The joint working point of compressors and pipe networks in small air separation units

The centrifugal compressor and the pipe network form a system of energy supply and use in which the compressor is the energy supplier and the pipe network is the energy user, each of which has its own characteristic curve. When they work together, the energy system can only be balanced when the flow rate through the compressor and the energy head generated by the compressor are equal to the energy of the pipe network and the resistance of the pipe network respectively. This is the intersection o...

May 13, 2022

Measures to ensure yield and purity in the distillation process of small air separation unit

The remote intelligent monitoring system developed independently by DEAR Air Separation realises the intelligent management of the whole process between the production site of the equipment and the remote monitoring terminal, and the system monitors the operational data of the equipment in real time. The system monitors the operating data of the equipment in real time. It provides active warning and real-time monitoring during the production process of the air separation equipment, enabling time...

May 12, 2022

Characteristics of krypton and xenon extraction in small air separation unit

Krypton and xenon are high boiling point components in air, with a low content in air and always mixed with gas oxygen or liquid oxygen in the small air separation units，large air separation units and liquid air separation plants tower. The extraction of krypton and xenon has the following main characteristics. because of the low content of krypton and xenon, their extraction has to be concentrated and purified several times, and the final yield is also low. krypton and xenon have high boili...

May 11, 2022

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