Device and method for enriching oxygen from compressed air

Abstract

The invention provides a device and method for enriching oxygen from compressed air. The device comprises a gas compression device, a heat exchange device and a membrane separation device. The gas compression device is bidirectionally connected to a heat source inlet and outlet of the heat exchange device so that a cycle is formed. The gas compression device is connected to a cold source inlet ofthe heat exchange device. A cold source outlet of the heat exchange device is connected to the membrane separation device. Retentate gas and permeate gas are obtained from an outlet of the membrane separation device. The membrane separation device is coupled to the existing compressed air supplying device so that low cost oxygen enrichment is realized, oxygen and compressed air are simultaneouslyfed on situ without influencing the use of the existing compressed air, the heat energy of the compressed air is fully recovered and is used for preheating membrane separation gas, the separation arearequired by the membrane separation device is effectively reduced, the cost of the equipment is reduced and the application prospect is wide.

Description

technical field [0001] The invention belongs to the technical field of gas separation and enrichment, and relates to a device and method for enriching oxygen from compressed air. Background technique [0002] The air contains about 21% oxygen and 78% nitrogen. Oxygen enrichment refers to the application of physical or chemical methods to collect oxygen in the air so that the oxygen content in the collected gas is ≥ 21%. Oxygen enrichment has a wide range of uses, involving Petrochemical, chemical, pharmaceutical, light industry, electric power, building materials, metallurgy, coal, transportation, aquaculture and national defense and military fields, for example, used in various kilns, boilers, heating furnaces, incinerators, heat medium furnaces, hot air Furnaces, smelting furnaces, engines and other combustion-supporting energy-saving and environmental protection fields, catalytic cracking, desulfurization, wastewater treatment, engine efficiency enhancement, oxygen-enrich...

AI Technical Summary

Problems solved by technology

However, with the research and development of membrane separation materials and breakthroughs in process technology, the α value of oxygen and nitrogen separation of organic membrane separation materials used in air separation is mostly between 2 and 7, and can be directly separated from air under a certain pressure ratio. Oxygen with a purity of about 30-60% can be obtained in the environment, and the cost control methods such as increasing the separation coefficient of the membrane separation material, further reducing the separation pressure ratio, and increasing the permeation rate have basically reached the limit, and it is becoming more and more unsustainable

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