Small air separation FAQ - DEAR Air Separation

How to transmit differential pressure signals in small air separation units?

If the diaphragm box is changed into a diaphragm, bellows or spring tube, it becomes a pneumatic differential pressure transmitter of various types. When this torque is equal to the size of the torque generated by the measurement signal, the main lever stops rotating, at which point the distance between the nozzle and the baffle stops changing and the amplifier steadily outputs a signal pressure. When the measured differential pressure increases, the transmitter and quickly repeat the above acti...

Jun 23, 2022

Small air separation unit oxygen compression process

Liquid oxygen products are pumped from the condensing evaporator, compressed to the required pressure by a liquid oxygen pump, then reheated and gasified by a heat exchanger and supplied to the customer, such a process is the oxygen internal compression process. The cost of the heat exchanger in the internal compression process increases because the heat exchanger oxygen channel is subjected to high pressure, but the cost of the liquid oxygen pump is much cheaper than the cost of the oxygen comp...

Jun 22, 2022

Small air separation unit pressure pipeline blast blowing process

After passing the strength test and before the air pressure tightness test, steel pipelines should be flushed and purged as required.Over the years, water flushing, air blowing, steam blowing and other techniques are mainly used for flushing and blowing. For small diameter pipelines this is more effective, for larger diameter pipelines often due to the flow rate of the blowing medium does not meet the requirements of the provisions and does not achieve the ideal blowing effect. As pipeline acces...

Jun 21, 2022

Nitrous oxide is a hazard for small air separation plants

Nitrous oxide N2 O. At atmospheric pressure, its boiling point is higher than that of N2, O2 and Ar.Under the conditions of pressure and temperature in small air separation equipment, it will concentrate in liquid oxygen during the separation of oxygen and nitrogen. The solubility of N2O in water is very small, N2O with the process air through the air filter, compressor, cooler, water separator can not be separated and removed, most of the N2O will be brought into the molecular sieve purifier, t...

Jun 20, 2022

Molecular sieve adsorbers for small air separation unit

Small air separation unitmolecular sieve adsorbent to meet the conditions of the better adsorbent is the commonly used silica gel, activated alumina, aluminium gel and molecular sieve adsorbent.1, silica gel, is a hard amorphous chain and mesh structure of silicate polymer particles, for a hydrophilic polar adsorbent. It can adsorb large amounts of water. When silica gel adsorbs moisture in the gas, it can reach 50% of its own weight, while in the air flow at 60% relative humidity, the moisture ...

Jun 17, 2022

Lacy ring air filter for small air separation plants

The Lacy ring air filter is a common type of wet filter for small air separation equipment. Its structure is that an insert box filled with Lacy rings is inserted in a steel box, and the Lacy rings are coated with filter oil with low freezing point. The Lacy rings in the insert box should be filled evenly, leaving no free space to prevent air from flowing through the empty space and affecting the filtering effect.Ltd. is located in the scenic city of Kaifeng, the ancient capital of the Seven Dyn...

Jun 16, 2022

Regeneration of molecular sieve for small air separation units

The reverse process of adsorption is regeneration. When the adsorbent is saturated with a certain adsorbent, it cannot adsorb any more adsorbent, then certain measures need to be taken to drive the adsorbed adsorbent away from the surface of the adsorbent, otherwise it cannot work properly. According to the physical properties of the adsorbent, there are two methods of regeneration: one is to pass dry and warmed dirty nitrogen gas into the adsorber, heating the adsorbent, which will desorb the a...

Jun 15, 2022

Liquid column manometers commonly used in small air separation units

There are two main types of pressure gauges in common use: liquid column gauges and flexible gauges.Liquid column manometers are used to measure smaller pressures and differential pressures. In the U-shaped tube filled with working liquid (mercury, water, alcohol, etc.), when the pressure at both ends is different, the height difference of the liquid column reflects the difference in pressure between the two sides. The difference in pressure is proportional to the density of the liquid and the d...

Jun 14, 2022

Thermometer selection in small air separation unit

It is not advisable to measure temperatures close to the room temperature. Because the measured temperature fluctuates around the room temperature, the vapour in the capillary tube and spring tube vaporises for a while and condenses for a while, which does not reflect the change in temperature correctly and in time.The temperature must not exceed its upper measurement limit when in use. Once exceeded, all the liquid in the temperature package vaporization, the vapor pressure is not saturated vap...

Jun 13, 2022

Small air separation unit to measure low temperature

The resistance value of metal materials are changing with temperature, but to be used to make resistance thermometer, the material has certain requirements:.1) the need for a high resistance temperature coefficient in the temperature range, that is, when the temperature changes 1 ℃, the change in resistance value is large, can make the sensitivity higher, and the best resistance value of the relationship with the temperature is linear.2) high chemical stability, easy to purify and replicate.3) a...

Jun 10, 2022

Types of thermometers commonly used in small air separation plants

1) Industrial internal standard glass liquid thermometer. It is made using the principle of volume expansion when mercury or alcohol is heated. The use range is -100～600℃, and the common range is 0～100℃. The advantage is that the structure is simple, the response is fast and accurate. The disadvantage is that it can only be measured locally, cannot be transmitted over long distances, and cannot be automatically controlled. In the small air separation plant, it is used for the temperature measure...

Jun 09, 2022

Main performance test of small air separation plant

The standardized design of the assembly process all adopts the machine-made wire number, and is equipped with the "Small Air Separation Plant Control Box Wiring Process Instruction"Standardized design of external wiring The requirements for external wiring of small air separation plants are divided into two types: when there is a large amount of wires and the diameter is thick, the wiring grooves are uniformly laid. When the amount of cables is small and the diameter is small, the threading pipe...

Jun 08, 2022

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