Liquefied air separation FAQ - DEAR Air Separation

Standardisation of the human-machine interface for liquid air separation plants

Uniform and standardised design of the human-machine control interface for liquid air separation plants to increase the ease of control of liquid air separation plants and improve the added value of the product. Industrialised design of applicationsThe industrialised design of large air separation unit applications, including the humanised design of the safety and protection of large air separation unit in the operation and maintenance of the design of convenient safety protection devices, to f...

Jun 01, 2022

The main factors affecting the packing capacity of liquid separation plants

As far as the liquid holding capacity is concerned, it is easier to establish a distillation condition in a packed column. This is because a packed tower only needs to wet the surface of the dressing and the liquid film can be built up, whereas a sieve plate tower requires the liquid layer to reach a certain height. The main factors affecting the amount of liquid held in the packed tower include: the shape, size, surface characteristics and filling characteristics of the packing; gas-liquid two-...

May 31, 2022

The liquid air separation plant industrial design status

In recent years, with the growth of the production and sales of liquid air separation plants, the market share has been increasing, but on the other hand, the overall technology of the equipment is poor, there are problems such as unattractive appearance, unclear and unclear logo, and unfriendly human-machine control interface. In order to further stabilise and develop the market and improve the recognition of the overall image of the liquid air separation plants, the industrial design of small ...

May 27, 2022

The role of the nitrogen water pre-cooler in liquid air separation units

The nitrogen water pre-cooler is a room temperature heat exchanger, installed outside the holding tank. It generally has two roles. One is to use the unsaturated degree of dirty nitrogen to cool the water, in the process air by water cooling, so that both the temperature of the air and the moisture content of the air can be reduced. The other role is in the air-cooled tower, the air and water contact, you can wash the air, to further remove the dust in the air and dissolve part of the impurities...

May 25, 2022

Liquid air separation plants argon maintenance

Due to deformation, the pipeline of the liquid-air steam of the crude argon tower back to the safety valve of the upper tower needs to be re-piped.Fine argon tower condenser liquid nitrogen discharge pipe, add fixed frame below the condenser, add guide frame in the middle of the fine argon tower. In close proximity to the crude argon tower inlet liquid argon pump outlet to the crude argon tower pipeline to a fixed frame, liquid argon pump outlet pipe from the bottom to the first straight se...

May 20, 2022

Liquid air separation plants start-up processes

Due to the tight start-up schedule of the liquid air separation plant, the cold box was no longer bare cooled after the overhaul. The workers removed the scaffolding and started loading sand directly, while starting the air compressor. After the system was started, the large air separation unitpiping was purged and the dew point was measured. At the end of sand loading in the cold box, the dew point < -65°C is measured at each relevant measurement point and the two expanders are switched ...

May 18, 2022

The process of liquid air separation plant sand picking

The full low pressure liquid air separation plant uses molecular sieve adsorption and purification, pressurized turbine expander refrigeration, regular packing on the tower, hydrogen-free hydrogen production, oxygen and nitrogen outside the compression process. Before the liquid air separation plant is sand stripped, a sand stripping plan and contingency measures are developed. Training for external construction teams, for all kinds of maintenance work tickets, etc. Firstly, open all the manhol...

May 16, 2022

Heat transfer by thermal conductivity in liuqid air separation plant

The transfer of heat between parts of an object in direct contact is called thermal conduction. In the case of heat conduction in liquids and solids, the transfer of energy relies on molecular collisions. Heat conduction between solid metals relies mainly on the movement of free electrons. The thermal conduction between gases, on the other hand, relies on the irregular movement of molecules. In thermal conduction, the amount of heat passing through a given area per unit of time is proportional t...

May 09, 2022

Types of problems with purifiers for liquid air separation plants

Brief description of the molecular sieve problem The purifier CO₂ suddenly started to run abnormally and suddenly went out of range in liquid air separation plants, the dew point never changed significantly. The dew point did not change significantly. In order to ensure that the other molecular sieve had enough time to regenerate, the time could not be shortened any further. At this point there was a relatively stable situation with no further deterioration. Check the trend graph for a cold bl...

Apr 28, 2022

What are the requirements for the start-up and operation of liquid air separation plants?

The start-up and operation of liquid air separation plants requires the operator to be familiar with the performance and operation of the systems, machines and equipment in the liquid air separation plants, to be familiar with the process flow diagram of the liquid air separation plants, and to master the operation rules and operating characteristics of the liquid air separation plants. In order to ensure the purity of the product, the operator must be able to improve the quality of the product ...

Apr 24, 2022

What are the properties of molecular sieves in liquid air separation plants?

The molecular sieve used in oxygen generators is the zeolite molecular sieve. It is a crystalline silica and aluminate polyhydric compound. Molecular sieves have a uniform pore size and their main function is to sieve molecules. There are three main types of molecular sieves: A, X and Y. The 13X molecular sieve is the only adsorbent currently used in liquid air separation plants. Any molecules that can be adsorbed on 3A, 4A and 5A molecular sieves can be adsorbed by 13X molecular sieves. It is c...

Apr 20, 2022

Liquid air separation plant circulating cooling water operation and control

According to the daily water quality analysis and laboratory results, supplement the discharge water and control the dosing amount to make it reach the required data index. When the turbidity is >20mgL, increase the amount of drainage water, increase the flow of side filtration, and supplement clean water. According to the current situation of the circulating water system, try to increase the concentration multiple operation to save water and medicine. If the concentration multiplier is g...

Apr 18, 2022

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