Small air separation FAQ - DEAR Air Separation

Nitrogen cycle pressurization variable load process in small air separation unit

This project we use nitrogen booster cycle in the design process of oxygen compression fast variable load process. The process in small air separation unit before the air leaves the molecular sieve is the same as the conventional process, and the air after leaving the molecular sieve purification unit is cooled in the main heat exchanger and then enters the pressure tower. The flow of the nitrogen booster cycle is ...

Feb 09, 2022

Full Tower Efficiency of small air separation unit

We calculate the number of plates assuming that the liquid and vapour on each plate are interacting to reach equilibrium. In practice, it is not possible to achieve an ideal equilibrium for all plates in a nitrogen distillation column, so the actual number of plates required is greater than the theoretical number of plates required. The ratio of the theoretical to the actual number of plates is the full tower efficiency. Factors affecting the full tower efficiency are: the gas phase and liquid p...

Jan 28, 2022

Why do molecular sieves in small air separation unit use bunk beds?

Why do molecular sieves in small air separation unit use bunk beds? Molecular sieve purifiers are used in both small and large air separation plants to purify the air. carbon dioxide, acetylene, and various hydrocarbons. Some molecular sieves small air separation unit use a double bed because the adsorption capacity of activated alumina is relatively large for air with high water content, but as the water content of the air decreases, the adsorption capacity decreases rapidly. The molecular s...

Jan 26, 2022

PSA gas separation technology in small air separation unit

PSA gas separation technology in small air separation unit In recent years, pressure swing adsorption (PSA) gas separation technology has been widely used in petroleum, chemical, steel, metallurgy, electronics, medical and environmental protection fields due to its easy operation, room temperature operation, low energy consumption, high degree of automation and environmental friendliness. The core of the VPS device is the adsorbent, a significant feature of the adsorbent is that the ads...

Jan 25, 2022

Installation of small air separation unit valves

1 pay attention to the direction of the arrow on the valve and the process requirements of the media flow direction, in order to avoid installation errors. 2 The pipeline connected with the valve should be thoroughly cleared of dirt, dust and other foreign mechanical impurities before installation. Prevent damage of the sealing surface of the valve. 3 The cold valve on the cold box should be installed at the same time as the corresponding brack...

Jan 21, 2022

Pressure test and gas tightness test for small air separation unit

1Test 1.1 The water used for the pressure test shall be clean domestic water ，for containers with complex structures or distillation towers, plate fin heat exchangers, condensing evaporators, adsorbers, filters, etc., which should not be used as a medium, the air pressure test is available. 1.2 Gas tightness test for dry oil-free clean air or nitrogen. 2 test pressure categories: strength air pressure test, test water pressur...

Jan 20, 2022

How to degrease in small air separation unit

It is recommended to degrease aluminium parts (pressure vessels, valves, pipelines) with perchloroethylene or trichloroethylene solvents, and carbon tetrachloride (CC14) solvents are strictly prohibited. The solvent must be oil-free and degreased, and decomposed solutions are not allowed. Organic solutions are not suitable for assemblies with rubber, plastic or organic coatings. Organic solvents are toxic and flammable and should be used with care. In addition t...

Jan 19, 2022

Advantages of centrifugal compressors in small air separation unit

Advantages of centrifugal compressors in small air separation unit Gas compression can be divided into volumetric and speed type according to the principle, piston air compressors are commonly used volumetric compressors, while centrifugal compressors are speed type compressors. The advantages of centrifugal compressors compared to piston compressors are obvious: compact structure, small size, large displacement, small consumption of raw materials; less wearing parts than piston compressors, lo...

Jan 18, 2022

How to arrange the high-pressure steam main of the small air separation unit?

How to arrange the high-pressure steam main of the small air separation unit? Small air separation unit for turbine high-pressure steam piping materials are selected according to the pipeline level, design temperature, design pressure and special requirements of the medium and other design conditions, as well as the corrosion resistance of the material, processing performance, welding performance and economic rationality. High-pressure steam main usually laid out on the corridor of small air s...

Jan 17, 2022

Rapid development of small air separation unit import and export in China

After 1990s, the specifications of imported air separation unit increased to 20000m³/h and above, mostly from Linde and French Air Liquide, and also American Air Products. Foreign companies began to build manufacturing bases in China precisely because they were optimistic about the rapid development of China's national economy and the high market demand. After 1994, Linde and Air Liquide established large air separation plant manufacturing bases in Dalian and Hangzhou, Liaoning Province, re...

Jan 14, 2022

Impeller requirements for centrifugal compressors in small air separation unit

The impeller is the component of the centrifugal compressor that does the work on the gas, in which the temperature pressure and flow rate of the gas are increased. The impeller is a key component in determining the performance of the centrifuge. The impeller must be designed and manufactured to meet the following requirements: it must transmit more energy to the gas flowing through it; the gas flow in the impeller must have low energy losses; and the impeller's structural, thermal and flow par...

Jan 13, 2022

Air separation plant air compression piping how to arrange

Air separation plant piping is an important part of the air separation unit, and each air separation system should have a piping arrangement design. When using air compressors as pipe supports, we should pay attention to the location of the fixed pipe frame. Air compressors are equipped with air venting silencers, silencers should be located as close as possible to the compressor, the purpose of doing so is to be able to quickly empty the compressor when it is close to the critical curve of whe...

Jan 12, 2022

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