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Views: 0 Author: Site Editor Publish Time: 2024-10-11 Origin: Site
What is the air separation unit?
Air Separation Unit (ASU) is a complex system used to separate oxygen, nitrogen, argon and other inert gases from air. This process is mainly based on the different boiling points of the components in the air, and is realized by physical methods (e.g., compression, cooling, distillation, etc.).
ASU is widely used in many industries, such as petrochemicals, metallurgy, electronics, medical, aerospace, etc, which is one of the indispensable equipment in industry.
What are the main systems of ASU?
1. Air compression system: First, the air is compressed to the required high pressure through a large air compressor to provide conditions for the cooling and liquefaction process.
2. Air purification system: Compressed air may contain impurities, such as dust, moisture, carbon dioxide, which need to be removed through molecular sieves to ensure the subsequent processes.
3. Air cooling and liquefaction system: Purified air will be cooled by a heat exchanger to partially or completely liquefy. During this process, the temperature of the air will significantly decrease, and oxygen and nitrogen components will reach the liquefaction point.
4. Air distillation system: Liquefied air enters the distillation tower (also known as the fractionation tower), where it undergoes multiple partial evaporation and condensation processes, and is separated by the different boiling points of each component. Finally, oxygen, nitrogen, argon, and other gases will be collected at different locations inside the tower.
5. Product storage and transportation system: The separated oxygen, nitrogen and other products will be stored and transported to the end user through pipelines or compressed gas bottles.
Molecular sieves is critical in air separation units, especially in gas purification and separation system, mainly in the following points:
1. Adsorption of impurities: Molecular sieves can selectively adsorb moisture, carbon dioxide, nitrogen oxides, hydrocarbons and some other impurities in the air through their unique crystal structure and pore size. If these impurities enter the air separation equipment, they may affect the operating efficiency of the equipment and the purity of the product.
2. Prevent freezing: Water vapor in the air will condense into ice in a low temperature environment, which may block the channels of the heat exchanger and separation equipment. Molecular sieves effectively prevent the occurrence of freezing problems by adsorbing moisture in the air.
3. Improve gas purity: The purification effect of molecular sieves can ensure that gases have higher purity when entering the process, which is crucial for producing high-purity oxygen, nitrogen, and other gases.
About Chemxin:
Chemxin is a leading manufacturer and exporter of molecular sieve in China since 2002, with a factory covering an area of 42,000㎡, the annual production capacity more than 50,000 tons. Our products strictly comply with the national standard GBT 10504-2008. Many customers have feedback that our 13X APG molecular sieve is equivalent to UOP molsieve UOP 13X APG adsorbent, and our activated alumina is equivalent to UOP D-201, Linde D-201.
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