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What are the functions of molecular sieves in air separation equipment?

What are the functions of molecular sieves in air separation equipment?
Jun 28, 2024
Author: DEAR AST

The molecular sieve in the air separation equipment is a key component that plays an important role in the air separation process,
Molecular sieves have the characteristics of high adsorption capacity, high selectivity, high mechanical strength, and low coefficient of thermal expansion. The operation process of the molecular sieve purification system: Air pretreatment, first preliminary filtration of the air to remove impurities of larger particles, to ensure the stable operation of the molecular sieve purification system. Molecular sieve adsorption utilizes the high adsorption capacity of molecular sieves to remove impurities such as water and carbon dioxide from the air. To achieve efficient purification of impurities in the air and provide high-quality air for the stable operation of air separation equipment. Impurity removal involves drying the air adsorbed by molecular sieves to remove remaining trace impurities and meet the air quality requirements of air separation equipment. Ensure the normal operation and product quality of the air separation equipment.
DEAR air separation has strict requirements for equipment manufacturing process design, and related systems present technical specifications.

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The air separation cold box is filled with insulation material, generally pearlite, and the pearlite particles are filled with air. After the operation of the air separation unit, the temperature of the insulation material and the air will decrease, and the volume will decrease. At this time, if the cold box is well sealed, negative pressure will be formed in the cold box, and the cold box may be compressed under the effect of internal and external pressure difference. If the cold box is not well sealed, the moisture outside the cold box will enter the cold box, making the insulation material damp, and the cold loss of the unit will be greatly increased. In order to prevent the cold box from being compressed and the thermal insulation material from becoming damp, dry nitrogen or crude nitrogen is usually filled into the cold box after the unit is running to keep the cold box at slightly positive pressure.
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