Air separation system for isobarically separating oxygen and nitrogen from air

Abstract

The invention relates to an air separation system for isobarically separating oxygen and nitrogen from the air. A Rankine cycle system of a similar thermal power cycle system of the low-temperature end is adopted, a hydraulic pump is adopted to input work, a refrigerant is utilized to supply cold to the air separation system, and therefore nitrogen and oxygen can be isobarically separated from the air. Under the premise of the same refrigerating capacity, the air separation system can save energy by more than 30 percent in comparison with conventional advanced units, meanwhile, by means of the air separation system, gas can be centrally supplied, and the air separation system is a breakthrough in the conventional air separation technology and the refrigeration theory, and can bring remarkable economic, social and environmental benefits.

Description

technical field [0001] The invention relates to an air separation device for preparing oxygen and nitrogen by isobaric separation of air, and specifically belongs to the technical field of deep freezing. Background technique [0002] The rapid development of the national economy is inseparable from the air separation device. The so-called air separation unit (abbreviated as air separation unit, commonly known as oxygen generator) refers to the use of the principle of deep freezing to liquefy air, and then carry out rectification in the rectification tower according to the difference in boiling point of each component, and finally obtain oxygen, nitrogen, or A device for simultaneously extracting one or several rare gases. [0003] In 1939, Academician Kapitza, a Soviet scientist, invented a high-efficiency (>80%) radial flow centripetal reactionary turboexpander, which created conditions for the birth of a fully low-pressure oxygen machine. The Kapitza turboexpander is ...

AI Technical Summary

Problems solved by technology

[0019] 2) The thermal efficiency of the Carnot cycle can only be less than 1, never equal to 1, because T 1 =∞ or T 2 = 0 is impossible to achieve

[0022] 5) The limit point of the Carnot cycle is the ambient temperature of the atmosphere, and the Carnot cycle does not give a clear answer to the refrigeration process cycle below the ambient temperature

[0024] However, using the basic theory of thermodynamics cannot make a concise, clear and intuitive explanation for the cycle process of the air separation unit.

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