System for separating oxygen and oxygen from air based on variable-frequency negative-pressure method

Abstract

The invention discloses a system for separating oxygen and oxygen from air based on variable-frequency negative-pressure method. The system comprises a gas processing unit, a gas separation unit and a main control unit. The main control unit comprises a measurement and control chip module, an intelligent control module and a man-machine interaction module. The measurement and control chip module obtains the temperature t of the air entering a hollow fiber membrane through a temperature sensor, the concentration c of oxygen at a vent of a variable-frequency vacuum pump through an oxygen analyzer, the flow x of the gas at a gas outlet of a gas storage tank through a flow sensor as well as the oxygen concentration range and gas flow range set by a user through the man-machine interaction module. The measurement and control chip module analyzes the oxygen concentration c, the oxygen concentration range set by the user, the gas flow rate x and the gas flow range set by the user according to different air temperature t, and sends the analysis results to the intelligent control module. The intelligent control module controls an electronic three-way valve, the variable frequency vacuum pump and a flow control valve by commands according to the analysis results.

Description

technical field [0001] The invention relates to the technical field of air nitrogen and oxygen separation, in particular to a system for realizing air nitrogen and oxygen separation based on a frequency conversion negative pressure method. Background technique [0002] Existing nitrogen and oxygen separation technologies mainly include pressure swing adsorption, membrane separation, magnetic separation, centrifugal separation and other technologies. Most of the traditional membrane nitrogen generators and pressure swing adsorption nitrogen generators on the market adopt the positive pressure method, using the air compressor to provide high-pressure gas to the front end of the separation device, and the pressure is lowered by the pressure regulator to make the oxygen concentration parameter at the outlet consistent with the set value , which creates pressure redundancy and energy waste. At the same time, pressure regulation and a series of devices are added, which increases ...

AI Technical Summary

Problems solved by technology

Most of the traditional membrane nitrogen generators and pressure swing adsorption nitrogen generators on the market adopt the positive pressure method, using the air compressor to provide high-pressure gas to the front end of the separation device, and the pressure is lowered by the pressure regulator to make the oxygen concentration parameter at the outlet consistent with the set value , which creates pressure redundancy, energy waste

At the same time, pressure regulation and a series of devices are added, which increases the manufacturing cost

In addition, most of these devices are adjusted in fixed gears, which cannot realize real-time stepless adjustment of the oxygen concentration of the outlet gas.

[0003] In the prior art, after the oxygen in the air is separated, the concentration of nitrogen at the inlet end of the separation device will increase, and the concentration of oxygen will be greatly reduced, which also greatly reduces the working efficiency of the separation device, so it is necessary to suspend the work Exhaust, which also makes the separation device unable to work continuously, affecting the separation efficiency

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