Small air separation FAQ - DEAR Air Separation

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

Self-cleaning air filter in small air separation unit

(1) In the box combination installation, the combined part of the clean air chamber should pay attention to. (2) welding form must be the net air chamber around the welding of the sealing welding in small air separation unit(i.e. full welding), no intermittent welding. (2) If the combination of gasket in the middle of the chamber is used, the bolts and nuts of the combination should be tightened. and sealed by injecting glass glue at the seam of the splice. (3) When installing the filter...

Mar 21, 2022

The structure of the water cooling tower selected for small air separation unit has the following broad types

Sieve plate tower. Tower plate using aperture and hole spacing of the larger shower drop tower plate. Nitrogen and water are from the sieve hole through. As the water cooling tower is not working continuously and steadily, the cooling effect is not ideal, so it is no longer used. Cyclone plate. It consists of several metal structure of the cyclone tower plate, this type of structure resistance is very small, will not damage, has been used for quite a long time as an improved type, but the heat ...

Mar 18, 2022

Installation of the air pre-cooling system in small air separation unit

Installation of the air pre-cooling system in small air separation unit (1) Air cooling tower is a pressure vessel, the site is strictly prohibited on the tower body fire. (2) installation requirements: verticality <1/1000, the full length of the range shall not exceed 10mm. (3) loading material before, clear the tower debris and check the tower pieces of fasteners, confirm no loose, off. (4) bare cold before, air-cooled tower, water-cooled tower at the top of the screen mist trap again c...

Mar 16, 2022

Heat exchangers in small air separation unit are classified according to the principle of heat transfer？

Small air separation unit so that the heat from the hot fluid to the cold fluid air separation unit is called heat transfer equipment or heat exchanger. The main heat exchangers in small air separation unit are: nitrogen water pre-cooler, switchable heat exchanger, main heat exchanger, condensing evaporator, subcooler, liquefier, gasifier, heater and air compressor cooler. According to the principle of heat transfer can be divided into three categories and various types of characteristics are....

Mar 15, 2022

What are the requirements of welded steel pipes for small air separation unit?

Welded steel pipes, also known as seamed steel pipes, are generally made of steel sheets or steel strips rolled and welded. According to the surface treatment form of the pipe: divided into galvanized and ungalvanized two. The surface of galvanised white, also known as white iron pipe or galvanised steel pipe; the surface is not galvanised, that is, ordinary welded steel pipe, also known as black iron pipe. Galvanised welded steel pipes, commonly used for conveying media requiring cleaner pipel...

Mar 14, 2022

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