Method for producing oxygen through six towers adsorption

Abstract

This invention discloses a high-efficiency method for producing oxygen with six adsorption columns suitable for altiplano. The method comprises: (1) introducing oxygen into adsorption column A, adsorbing nitrogen by the molecular sieve in adsorption column A, and exhausting oxygen from the oxygen exhaust mouth under high pressure and multi-pass rotary distributing valve control; (2) shutting off the air inflow pipeline when the molecular sieve is saturated, and opening the pressure-balancing passage of adsorption column A to reduce the pressure; (3) opening the counter aeration passage of adsorption column A to exhaust nitrogen when the pressure is reduced to a certain value. Under the control of the multi-pass rotary distributing valve, adsorption columns A, B, C, D, E and F work in turn. Nitrogen and oxygen are separated by pressure swing adsorption of the molecular sieve, thus oxygen is obtained from air. The method has such advantages as high oxygen yield (58-65%), high oxygen concentration (93 plus and minus 3%), and high oxygen production efficiency, and can effectively produce oxygen for altiplano.

Description

technical field [0001] The invention relates to the technical field of oxygen production, and more specifically relates to a high-efficiency six-tower adsorption oxygen production method suitable for plateaus. Background technique [0002] At present, there are mainly the following oxygen generation technologies: chemical method, cryogenic separation (Cryogenic Systems) method, water electrolysis method, membrane separation method, molecular sieve pressure swing adsorption (Pressure Swing Adsorption, PSA) method, etc. [0003] (1) Chemical method: The method of chemical reaction is used to consume chemicals, and it is mainly used for oxygen under special conditions. [0004] (2) Cryogenic separation method: The equipment is large in size and high in investment, and is suitable for large-scale oxygen production; it takes a long time to start up, and oxygen can only be produced normally after more than ten hours; it consumes a lot of power and is complicated to operate and mai...

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Problems solved by technology

[0004] (2) Cryogenic separation method: the equipment is large in size and high in investment, and is suitable for large-scale oxygen production; it takes a long time to start up, and oxygen can only be produced normally after more than ten hours; it consumes a lot of power and is complicated to operate and maintain

At present, using the molecular sieve pressure swing adsorption method, the structure of the adsorption tower can be divided into 2 towers and 4 towers; the plateau air is thin and the power generation efficiency is low, and the oxygen yield is an important indicator.

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