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Advantages and disadvantages of the accumulator of small air separation unit

Advantages and disadvantages of the accumulator of small air separation unit
Jul 10, 2025
Author: DEAR AST

The accumulator is a heat exchanger that transfers hot and cold airflow through a filler as a medium. When the cold airflow passes through the accumulator, the cold is stored in the filler and the airflow is heated, and when the hot airflow passes through the accumulator, the airflow takes the cold from the filler. It has the advantage of being simple in structure, low resistance and not easily blocked. The disadvantages are high switching losses, mutual contamination during switching and reduced purity. The airflow impact causes abrasion of the seasoning and its powder is easily carried intosmall air separation unit.

The reason why Dear Air Separation has such strong R&D strength and advanced technology in line with international standards is due to our in-depth cooperation with well-known institutions at home and abroad, such as the Chinese Academy of Sciences, Japan's Dayang Institute of Nitric Acid Research and Tianjin University, which has led to rapid development in process design, manufacturing, installation and commissioning.6

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Special pressure-bearing equipment generally bears internal pressure, that will cause tensile stress inside the shell, which is called working stress. The working stress is directly proportional to the pressure and diameter, and inversely proportional to the vessel wall thickness. The axial stress is half of the circumferential stress. Therefore, for cylindrical vessels, the stress of longitudinal weld is twice that of girth weld. Because the geometric shape of the spherical shell is symmetrical to the spherical center, and the axial stress is equal to the circumferential stress in numerical value. Therefore, the wall thickness of the spherical vessel can be reduced by half as much as that of the cylindrical vessel under the same pressure and diameter.
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