Small air separation FAQ - DEAR Air Separation

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

Small air separation unit water circulation system scale inhibitor

In order to avoid microbial resistance to a single agent, weakening the effect of dosing, the use of two kinds of algaecide in the water circulation system of small air separation unit alternately added. When adding algaecide, first clean the cooling tower tower pool, then add algaecide and maintain 6 to 8 hours without drainage. As the open circulating cooling water and outside contact with a wide range, most likely to breed algae and biological slime. In order to achieve the best effect of ba...

Mar 25, 2022

Small air separation unit freezer soft scale

Slight cold scale (<0.5mm). a.Quick treatment: increase the water temperature or use hot steam to heat the soft scale b.Daily treatment: add polymer dispersant in the small air separation unit freezer, and increase the amount of low temperature scale inhibitor. B.Severe cold scale(>1mm) : Physical method : Clean the copper pipe with hard brushes clamped by electric drill. b.. Chemical method : Use chemical agent, clean the freezer alone and do scale sample analysis bef...

Mar 24, 2022

Small air separation units start-up operation accumulation

Liquid accumulation stage essentials: ensure that the two expansion machine pressure before the machine is stable, maintain the highest permissible speed, so that it runs at full load. When the condensing evaporator liquid oxygen liquid surface, should promptly close the small oxygen flow to the normal flow of about 1/3, control the upper tower pressure, and gradually close the small liquid nitrogen throttle valve to full shutdown. Timely adjust the amount of air into the tower, to ensure that t...

Mar 22, 2022

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