Liquefied air separation FAQ - DEAR Air Separation

Liquid air separation plant fractionation tower system for heating

Liquid air fractionation plant after a long period of operation, in the fractionation tower system of low temperature containers and pipelines may produce ice, dry ice, hydrocarbons and other deposits, resulting in a gradual increase in device resistance, increased energy consumption, affecting the purity and yield of the product. For this reason, whenever the unit runs after a cycle, the fractionator system should generally be fully warmed and thawed to remove these deposits.Liquid air separati...

Jun 21, 2022

Liquid air separation unit in the cold box piping considerations

In order to reduce the cold loss caused by improper piping arrangement in the cold box, the following points should be noted when piping in the cold box.1, the pipelines can not touch each other, hot and cold pipes should be left a certain distance.2, a variety of liquid pipeline or cold tube should be as close as possible to the internal cold container, gas pipeline arrangement in the liquid pipeline outside.3, gas pipeline from the wall of the cold box should be a certain distance.4、The liquid...

Jun 16, 2022

Liquid air separation units commonly used in the liquid column type pressure gauge

Elastic pressure gauge is made according to the principle of deformation of elastic components under pressure. Commonly used elastic components are spring tube, elastic diaphragm, membrane box, bellows, etc., and its working principle is the same. The structural principle of the spring tube manometer is shown in Figure 114. It is a hollow metal tube bent into a 270° arc, the tube cross-section is oval or flat circle, the free end of the tube is closed, the other end is fixed on the connector...

Jun 14, 2022

Liquid air separation plant temperature measurement instrument common failures

Thermocouple thermometer common fault for the indication of low value, or stop at zero. This is due to the thermocouple generated problems, may be poor contact or broken circuit, generally do not appear to indicate the phenomenon of high.In order to ensure the measurement accuracy, the use of the cold end of the temperature compensation should be correct (commonly used compensation wire method), and pay attention to the thermal electrode and the earth between a good insulation.RTD thermometer co...

Jun 10, 2022

Heating and thawing operation of fractionation column system of liquid air separation plants

The liquid air separation plant operates normally for about two years, and the fractionation tower system should be heated and thawed. Because the liquid air separation plant has been running for a long time, the low-temperature equipment and pipelines in the rectification system will be blocked due to the internal precipitation of ice or mechanical powder, resulting in an increase in the resistance of the fractionation tower. Therefore, it is necessary to warm and thaw the fractionator system t...

Jun 08, 2022

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

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