High-temperature circulating type carbon dioxide removal method based on rotary fixed bed

Abstract

The invention discloses a high-temperature circulating type carbon dioxide removal method based on a rotary fixed bed. According to the method disclosed by the invention, a fixed bed rotor which is filled with a calcium-based absorbent rotates to a high-temperature flue gas side passage; the CO2 in the flue gas is removed by calcium-based absorbent fillers and CaCO3 is formed; the flue gas is exhausted after the CO2 is removed; CaO is transformed into the CaCO3 by virtue of a carbonation reaction; the fixed bed rotor still takes the fillers which are transformed into the CaCO3 and rotates to afuel gas side passage; fuel gas and pure oxygen are fed to the region to be combusted to emit heat in order to supply heat for decomposition of the CaCO3; high-concentration CO2 is released; subsequently the CO2 is discharged from the reaction region and is hermetically stored or is used for other purposes; the CaCO3 is decomposed and regenerated as CaO; after the internal fillers are regenerated, the fixed bed rotor rotates again to a flue gas side to capture and separate the CO2 in the flue gas; and the rotor and the absorbent fillers filled in the rotor are used for periodically implementing circulating removal and centralization of the CO2 in the flue gas via the flue gas side and the fuel gas side.

Description

technical field [0001] The present invention relates to CO 2 In the field of emission control and emission reduction, it specifically relates to a high-temperature cycle removal method for carbon dioxide based on a rotary fixed bed. Background technique [0002] Global warming has made countries to reduce CO in the process of fossil energy utilization 2 Emissions are controlled and reduced, currently CO 2 Capture technologies mainly include post-combustion capture (chemical absorption, adsorption, membrane separation, low-temperature fractionation), pre-combustion capture (Linde Rectisol low-temperature methanol washing, UOP Selexol polyethylene glycol dimethyl ether method), oxygen-enriched combustion, etc. Due to the problems of high construction cost and high system efficiency loss in conventional pre-combustion capture, post-combustion capture and oxyfuel combustion technologies, the chemical chain cycle capture of CO based on calcium-based absorbents 2 technology has...

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Problems solved by technology

[0003] The Ohio State University in the United States, the University of Stuttgart in Germany, the Vienna University of Technology in Austria, the Canadian Mineral Energy Research Center, and the Spanish National Coal Institute have all established small-scale CO2 based on calcium-based chemical chains. 2 The capture device provides a lot of useful references for the improvement of this technology. The main problem of the above-mentioned calcium-based chemical chain carbon capture devices is that they all use circulating fluidized beds or bubbling fluidized beds as reactors. The inherent advantages of fluidized beds are The materials are strongly mixed and reacted fully, but at the same time, there are problems such as complex system, high difficulty in control of material fluidization, material separation and transportation, and wear of absorbent particles.

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