Small air separation FAQ - DEAR Air Separation

What measures to consider for the transport and acceptance of oxygen piping materials in small air separation units?

Small air separation unit material production process should reduce grease and debris pollution and reduce the amount of subsequent processing works and processing difficulties. Small air separation unit material section in the factory before, transport and storage process using the adoption of strict closed measures to prevent secondary pollution. Specific measures are: Store small parts in pockets: Close the openings of the small air separation unit : Nitrogen sealing or drying and other metho...

Apr 19, 2022

Small air separation unit valve shell casting defect types

1 Pore Porosity is a hole formed in the casting when the gas in the molten alloy fails to escape during the solidification of the molten alloy. 2 Inclusions Inclusions are various metallic foreign bodies and non-metallic foreign bodies contained in the casting with a composition different from the basic composition, including metal inclusions, slag, sand. 3 shrinkage Casting molten alloy in the solidification process, because of the alloy liquid shrinkage and solidification shrinkage can no...

Apr 18, 2022

Safety hazards of valves for oxygen in small air separation units

Oxygen (including liquid oxygen) is one of the main products of small air separation units, but also a strong accelerant and strong oxidant. Grease, fibres and metals can become combustible in a high oxygen concentration. Once the valve housing for oxygen leaks out, oxygen leakage may lead to deflagration or explosion. Valves for oxygen in small air separation units as well as cryogenic valves require non-destructive testing of the pressure-bearing parts of the valve body for technical requirem...

Apr 15, 2022

Special requirements for the construction of oxygen in small air separation units

The structure of an oxygen press requires special requirements in order to ensure the safe operation of the oxygen press. Oxygen presses have a lower exhaust temperature than air compressors, so the number of stages is higher than for air compressors. Water lubrication or oil-free lubrication is required in the cylinder. The piston rod must be at least twice as long and have a well-sealed oil scraping device and an air leak recovery device. Any parts that come into contact with oxygen need to be...

Apr 14, 2022

Circulating cooling water system cleaning and pre-filming in small air separation units

Water circulation, whether it's new or old, requires system cleaning and pre-filming before dosing. The pretreatment of circulating water systems for chemical treatment includes cleaning work and pre-film work. For new systems, small air separation units and piping can sometimes have debris, debris and dust left in the system during installation, and sometimes cooling equipment can be heavily rusted and oiled. If these debris and oil are not cleaned, they will affect the next step of the pre-fil...

Apr 12, 2022

Operation and maintenance of circulating water system of small air separation units

Apr 11, 2022

The role of the condenser in small air separation units

In the condensing evaporator nitrogen is condensed at the same time, liquid oxygen is evaporated oxygen as the rising gas of the upper tower, and the upper tower of the reflux liquid rich oxygen liquid air, poor liquid air, dirty liquid nitrogen, liquid nitrogen by packing for heat mass exchange, in the condensing evaporator to get high purity liquid oxygen, in the middle of the upper tower to get argon containing argon 8 a 12% of argon fraction, by the argon making system can get high purity li...

Apr 08, 2022

Small air separation unit circulating cooling water common problems judgment and treatment

(A) air cooling tower spray head cold scale To determine whether the low-temperature water spray head scaling: check the recent 3 to 6 months of low-temperature cooling water spray flow and valve opening: if the spray flow has not changed, but the valve opening gradually rise (such as from 50% gradually up to 80%), it means that the low-temperature water in the gradual formation of low-temperature scale, while the air-cooled tower spray head also has obvious blockage. If the valve opening is ...

Apr 07, 2022

Small air separation unit water circulation system of adding scale inhibitor method

(1) Scale and corrosion inhibitor pouring method: according to the amount of the agent will be poured into the washed dosing bucket, in constant stirring pouring supplemental water will be diluted about 3 ~ 5 times. Dilute the agent in order to prolong the total time of pouring, according to the situation of water quality to decide whether to dilute. After mixing and stirring the drug and water, turn on the dosing pump and adjust the dosing valve so that the drug is continuously and evenly poure...

Apr 02, 2022

Design basis for circulating water in small air separation units

According to the system water balance, water treatment to ensure that the circulating water system does not corrode and scale. Water treatment operation steps: flushing the system with clean water is to remove mechanical impurities and suspended matter from the system. When the water system is full of water, then turn on the pump to run. When the turbidity of the circulating cooling water system is high, drainage replacement is carried out. When the turbidity is below 20mg, then move on to the ...

Mar 31, 2022

Small air separation unit water cooling tower cold scale

The way to determine whether there is cold scale in the water cooling tower View the data of the last 3-6 months, in the case of the same amount of dirty ammonia, to determine the cooling rate of low-temperature water, or in the maintenance of the low-temperature water pump before the filter to see if there is low-temperature scale. Water cooling tower packing is relatively loose, generally will not affect production, can be by reducing the concentration of circulating water times, and then ...

Mar 29, 2022

Small air separation units water circulation system problem prevention

Sediment deposition Determine whether the system has sediment deposition: circulating water turbidity for a long time (3 months) high (greater than 20NTU), heat exchanger tend to temperature rise significantly (longer than 1 ℃ / month) Treatment method: chemical cleaning, with hydrochloric acid with hydrofluoric acid (sediment temperature increases will have thermal scale precipitation). Biological slime determine whether there is biological slime deposition: cool water tower has a lar...

Mar 28, 2022

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