Air separation device for preparing oxygen and nitrogen through isobaric separation

Abstract

The invention relates to an air separation device for preparing oxygen and nitrogen through isobaric separation. In the air separation device, a Rankine cycle system with a similar thermal energy power cycle device at a low-temperature end is adopted, a liquid nitrogen washing process is adopted, and cold is replenished to the air separation device through a liquid nitrogen washing cold-replenishing system, so that nitrogen and oxygen can be prepared by performing isobaric separation on the air. Compared with the conventional advanced unit, the air separation device has the advantages that on the premise of the same refrigerating capacity, energy is saved by over 30 percent compared with the traditional advanced unit, equipment and materials are saved, and operation and adjustment are performed flexibly and conveniently; and meanwhile, multiple pressure grades and multi-gas supply can be realized conveniently through the air separation device, so that low-energy-consumption concentrated air supplying can be realized, the conventional air separation technology and theory are broken through, and remarkable economic, social and environmental protection benefits are achieved.

Description

technical field [0001] The invention relates to an air separation device for isobaric separation and preparation of oxygen and nitrogen, specifically belonging 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 device (referred to as air separation device, 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 the 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 full-low pressure oxygen machine. The Kapitza turboexpander...

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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

[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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