System and method for purifying carbon dioxide

Abstract

The invention provides a system for purifying carbon dioxide. The system comprises an air supply unit, a microwave adsorption and desorption unit and a separation unit which are connected in sequence;the microwave adsorption and desorption unit combines an adsorption tower with a microwave heating device, and a waveguide tube extending into the adsorption tower is arranged on the microwave heating device, so that the regeneration efficiency of the adsorbent is greatly improved, the device size is small, and the service life of an adsorbent is long; according to the method for purifying the carbon dioxide by utilizing the device, an adsorption technology, a microwave heating regeneration technology and a condensation separation technology are combined, so that the desorption regeneration efficiency of the adsorbent is improved, the cycle operation time is shortened, the energy consumption is reduced, carbon dioxide with the volume concentration of 85% or more can be obtained, and the system and method have a relatively high practical application value.

Description

technical field [0001] The invention relates to the technical field of gas purification, in particular to a system and method for purifying carbon dioxide. Background technique [0002] CO 2 Separation is an important gas separation process. In recent years, CO 2 Various treatment technologies (such as CO 2 The removal, removal, removal, adsorption, absorption, enrichment, capture, separation, purification technology and decarbonization technology) have been widely studied, and the progress of the literature is frequently reported. A variety of processing technologies have been developed at home and abroad, and these technologies are mainly divided into wet and dry methods. Among them, the dry method is mainly the consumptive strong alkali method and the adsorption method; the wet method is the absorption and decarburization through the renewable solvent, mainly the absorption separation method. In addition, there are membrane separation methods, oxygen-enriched combusti...

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Problems solved by technology

However, the system has large volume, high energy consumption, and complicated automatic control.

[0006] CN108744897A discloses a carbon dioxide membrane separation system. The membrane separation method has unique advantages in principle and operation, but the development of special membrane materials and low concentration CO 2 The separation process is still in the development stage, and it is difficult to put it into practical application in the short term

[0007] CN105727729A discloses a continuous cycle carbon dioxide capture system based on in-situ adsorption / desorption. The system uses carbonation reaction to achieve the purpose of absorbing and desorbing carbon dioxide. However, the system uses chemical methods, and it is difficult to handle chemical materials.

[0009] However, the current renewable adsorption has the technical problems of large equipment volume and difficult desorption and regeneration. Therefore, it is necessary to develop a renewable carbon dioxide purification system to achieve efficient purification of carbon dioxide and efficient regeneration of adsorbents.

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