Device and method for preparing oxygen and nitrogen

Abstract

The invention discloses a device for preparing oxygen and nitrogen. The device comprises an air compression and purification unit connected with an air inlet, a compressed air storage tank connected with the air compression and purification unit through a pipeline, a carbon molecular sieve tank provided with a carbon molecular sieve inside and connected with the compressed air storage tank through a pipeline, and a nitrogen storage tank and an oxygen storage tank connected with the carbon molecular sieve tank through pipelines respectively, wherein a first electromagnetic valve is arranged on the pipeline between the carbon molecular sieve tank and the compressed air storage tank, the nitrogen storage tank is connected with a nitrogen outlet through a pipeline, the oxygen storage tank is connected with an oxygen outlet through a pipeline, a second electromagnetic valve is arranged on the pipeline between the carbon molecular sieve tank and the nitrogen storage tank, and a third electromagnetic valve is arranged on the pipeline between the carbon molecular sieve tank and the oxygen storage tank. By the adoption of the device, separation of nitrogen and oxygen can be achieved through one carbon molecular sieve tank. In this way, compared with the prior art, the device has the advantages that cost is saved, the structure is simplified, and popularization in families and vehicle-mounted usage are facilitated.

Description

technical field [0001] The invention relates to the technical field of gas separation, in particular to A kind of equipment and method for producing oxygen and nitrogen . Background technique [0002] Since the late 1960s and early 1970s, the use of compressed air as raw material to produce nitrogen or oxygen alone through carbon molecular sieves has developed rapidly abroad. The mixture separates. [0003] In the prior art, the commonly used carbon molecular sieve double-tank method for nitrogen production is taken as an example. The separation effect of carbon molecular sieves on oxygen and nitrogen is mainly based on the different diffusion rates of these two gases on the surface of carbon molecular sieves. activated carbon Carbonaceous adsorbents with certain characteristics of molecular sieves. Carbon molecular sieves are composed of very small pores, and the pore size distribution is between 0.3nm and 1nm. The gas (oxygen) with smaller diameter diffuses faster an...

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Problems solved by technology

[0004] The carbon molecular sieve double tank of the prior art has a complex structure and high cost, which is not conducive to popularizing household use

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