Small air separation FAQ - DEAR Air Separation

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

Piston type liquid pump for small air separation unit

There are many reasons why a piston type liquid pump type positive displacement pump does not hit the pressure, the liquid is incompressible. Then the pressure can not play up must be because the liquid flow is not large enough. Liquid flow is not large enough for the following reasons: partial gasification of the liquid medium, the presence of gas in the liquid cylinder. poor sealing of the inlet valve or exhaust valve, so that the liquid leaks back into the liquid cylinder. piston ring w...

May 10, 2022

What are the features of the self-cleaning air filter in small air separation units

The self-cleaning air filter pre-filter is designed to prevent willow, leaves and waste paper from being inhaled, to reduce the burden on the cartridge and to extend its service life. The self-cleaning air filter is a computer-controlled mechatronic product, which is easy to install and only requires piping, electricity and air to work. Features small filtration resistance: small machines ≤ 150pa, large machines 300-800pa. wide adaptability: air separation equipment filter using imported...

May 09, 2022

How to control a pressurised turbine expander in a small air separation unit？

In the cooling phase of small air separation unit, the lower the expander outlet temperature the better, while ensuring that no liquid appears at the expander outlet. The operating point is also determined according to the outlet pressure and outlet temperature of the expansion. In the accumulation of liquid and oxygen, nitrogen purification stage, all equipment in the cold box when further cooling, air began to liquefy, the lower tower began to appear liquid-air liquid level, followed by the m...

May 07, 2022

Packings for small air separation unit accumulators

The selection of the filler for small air separation units，large air separation units and liquid air separation plants is very important for the accumulator. The filler should first of all have a large surface area. In order to be able to store more cold in a smaller volume, the filler should also have a sufficient thermal conductivity and heat capacity, i.e. a large specific heat of volume. In addition, the filler of the accumulator should have a certain mechanical strength, i.e. resistan...

May 06, 2022

Small air separation unit valve shell casting radiographic inspection negative assessment methods

(a) assessment of porosity, inclusions and other defects According to the thickness of the test site to determine the size of the assessment frame, with the assessment frame to select the most serious defects in the detection area, the size of the defect, the different sizes of defects into different points, and then according to the number of points to assess the grade. (ii) Assessment of shrinkage and shrinkage defects Strips of shrinkage measured its maximum length, dendritic, feathery, sp...

May 05, 2022

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