Large air separation FAQ - DEAR Air Separation

Research on the industrial design of large air separation units

DEAR Air has a number of patented inventions, of which the "ultra-low discharge pressure and energy saving patent" is the leading one in China. The innovative five systems are mainly achieved by reducing the discharge pressure of the air compression system; reducing the resistance of the air cooling tower of the encounter cooling system, the adsorber of the purification system and the flow meter of the control system; upgrading the fractionation tower system by replacing the upper tower, the low...

May 26, 2022

Standardisation of electrical processes for large air separation units

Centralised drainage design for the whole machine①For small air separation units and downhole equipment, a fixed and uniform centralised drainage outlet is designed on the skid block.②For large air separation units, the centralised drainage components are prefabricated in the workshop according to the design and taken away with the delivery, and then incorporated into the drainage line during installation on site according to the actual situation on the customer's side. Design of the operating ...

May 24, 2022

Reasons for main cooling of large air separation units without gas condensation

Addition of 3 brackets on the line before the liquid nitrogen into the liquid nitrogen metering tank. Add fixed racks on the main cold, liquid oxygen metering tank oxygen export line converge into out of the main cold before the oxygen main, add brackets on the lower tower. From the bottom to the top of the second elbow down about 1.5m of the liquid air out of the lower tower pipeline to add fixed brackets. Before the dirty nitrogen into the subcooler, the original bracket is changed to a frame ...

May 23, 2022

The large air separation unit cold box maintenance work

The inspection work includes setting up scaffolding from bottom to top in the cold box and entering the cold box to check the specific damage to the piping. The liquid-air return pipe of the crude argon tower was bent and deformed, and the RTD cable on the liquid-air pipe was disconnected, and the safety valve pipe of the liquid-air steam of the crude argon tower was deformed and extruded together with the safety valve pipe of the condenser of the fine argon tower. The fine argon tower evaporato...

May 19, 2022

Fine argon tower pressure of large air separation unit

Large air separation units operator in the medium pressure system filling pressure, found that the pressure on the side of the fine argon tower has been rising, the final judgment of the fine argon tower evaporator has a string of leakage. So the workers cut open the evaporator barrel and found that the non-condensable gas blow-off tube was leaking in at the gap between the outgoing barrel and the casing. At the end of the overhaul sand picking, workers found that the non-condensable gas blow-of...

May 17, 2022

Large air separation unit argon purification stage

The cooling of the argon system of the large air separation unit should be carried out simultaneously with the cooling of the main tower system. After the cooling of the argon system, even if the argon system is not put into operation, a certain amount of cold should be introduced to the argon system to keep the argon system always in a cold state. Argon system can choose to adjust the pure and the main tower at the same time, more appropriate to wait for the main tower system adjustment is norm...

May 13, 2022

Low outlet pressure of piston type liquid oxygen pump for large air separation unit

Low outlet pressure is one of the common failures of piston type liquid oxygen pumps. The causes of low outlet pressure are usually wrong pump steering, insufficient speed, steam in the pump or a blocked inlet filter. If a piston liquid oxygen pump has a low outlet pressure fault, stop the pump to check the cause. If the steering is wrong, change the motor wiring. If there is steam in the pump, the exhaust line needs to be opened and re-cooled. If the filter is clogged, it needs to be disassembl...

May 11, 2022

Convective heat transfer in large air separation units

Convective heat transfer is one of the ways in which heat is transferred from a high temperature object to a low temperature object, using the flow of a fluid to transfer heat from one part of the fluid to another. The strength of convective heat transfer is expressed in terms of the heat transfer coefficient, which is influenced by the type of fluid. In addition to this, the state of flow of the fluid, the dynamics of the fluid that produce the flow and the shape of the radiating surface all af...

May 10, 2022

Tpes of weld defects in large air separation unit cast steel parts

ypes of weld defects in air separation equipment cast steel parts The morphology of cast steel defects on radiographs differs from that of welding defects, and the correct identification distinguishes the types of defects Inclusions 1 Metal inclusions Metal inclusions are mainly mixed in the casting metal melt in other kinds of metal pieces. It has a certain geometry, size of density and atomic number compared to the casting metal. Its image may appear as a lower or higher blackness th...

May 07, 2022

The purification system of the large air separation unit

The raw air is compressed to 0.50 MPa in an air compressor after passing through an air filter, cooled by a pre-cooling system, and then enters the molecular sieve adsorber for switching. After being pre-cooled and purified, the majority of the air eventually enters the fractionation column. The purification system has two molecular sieve adsorbers, one working while the other is regenerated (the large air separation unit uses the heating regeneration method) and the two adsorption drums work al...

May 05, 2022

Large air separation unit purification system carbon dioxide exceeds the standard problem analysis

The small air separation units, large air separation units and liquid air separation plants use ambient temperature molecular sieve adsorption purification, pressurized turbine expander cooling, liquid oxygen evaporator pressurization, gauge packing distillation, and DCS system control of the self-pressurization process. All systems are operating normally. The regenerated molecular sieves were not thoroughly regenerated and a vicious cycle occurred, increasing operating costs and risks. Operati...

Apr 29, 2022

What factors affects large air separation unit centrifugal compressor exhaust volumes?

Many factors affect the centrifugal compressor exhaust volume, in addition to design, manufacturing, installation, in addition to the operation of large air separation units compressor can affect the exhaust volume of the main factors are. 1) Air filter blockage or increased resistance, resulting in lower compressor inlet pressure. 2) air separation equipment pipeline blockage, increased resistance or valve failure, triggering the air compressor exhaust pressure rise. 3) compressor intercoole...

Apr 26, 2022

1...7 8 9 10 11 12 13 14...24

Didn’t find the problem encountered?
Please contact live chat or email for quick help.

Chat online service@dearast.com