Method and device for separating combined oxygen and nitrogen absorbed together by temperature change

Abstract

The invention relates to the technical field of mixed gas separation, in particular to a method and a device for separating combined oxygen and nitrogen absorbed together by temperature change. The device comprises at least two absorption towers filled with absorbent, a heating and heat exchange device which heats and cools the absorbent in the absorption towers, pipelines supplying raw material gas to each absorption tower, a pipeline taking out the product gas from each absorption tower, a pipeline for recycling and exchange of gas components and energy between the absorption towers so as to transfer the gas kinetic energy and heat of the absorption tower which absorbs saturatedly to the other absorption tower, an oxygen and nitrogen product gas cushion tank, washing pipelines introducing the oxygen product gas to the feeding end of each absorption tower, and washing pipelines for introducing the nitrogen gas product to the discharging end of each absorption tower. The separating method provided by the invention can obtain two kinds of high-purity products, namely oxygen and nitrogen, at the same time by adopting a single absorption and separating process, and therefore meets the requirement of astronauts on the aerospace oxygen. The device system can be integrated highly, and the size and weight of the device system meet the requirements of the future aerospace craft on oxygen and nitrogen extraction development and the requirements of the onboard equipment.

Description

technical field [0001] The invention belongs to the technical field of mixed gas separation, and specifically relates to a method and device for separating raw gas mixtures through a non-cryogenic process, in particular to a method and device for separating a mixture containing various gas components by using a temperature swing adsorption separation system. The method and device for recovering at least one product gas, more typically, relates to a separation method and device for simultaneously separating oxygen and nitrogen from air. Background technique [0002] Oxygen and nitrogen are used as basic industrial gases with more and more important applications. In the fields of aviation and aerospace, oxygen is mainly used for breathing and combustion, personnel breathing at high altitudes, personnel breathing under nuclear and biological conditions, and high-altitude emergency parachuting Oxygen for breathing, oxygen-enriched or pure oxygen for combustion of aircraft, oxyge...

AI Technical Summary

Problems solved by technology

Apparently, the patent achieves a theoretically obtainable variety of product streams of different purity by employing three different types of gas separation technologies—high-purity oxygen (produced from solid electrolyte air separation units), medium-purity oxygen (produced from PSA air separation) device), low-purity nitrogen (produced from the air separation device of organic membrane separation technology), but because the type of technology used is too complicated, it is difficult to apply the integrated application to the actual airborne operating environment, and more or more System resources are consumed, and maintainability and maintenance costs are worse than those of a single technology type

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