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Method of regenerating activity of calcium based absorbent and cyclically removing CO2

A calcium-based absorbent and removal technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of absorbent inactivation, capture performance decline, etc., to maintain activity, inhibit absorbent activity decline, The effect of reducing the discharge of inactivated absorbent

Inactive Publication Date: 2018-02-16
ANHUI UNIVERSITY OF ARCHITECTURE
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Problems solved by technology

[0003] Current calcium-based sorbent cycle for CO removal 2 The main technical problem is that the calcium-based absorbent undergoes irreversible sintering of the crystal structure during the high-temperature cycle, resulting in densification of the porous structure of the absorbent, thereby hindering CO 2 Enter the core of the absorbent to participate in the carbonation reaction, deactivating the absorbent, that is, CO 2 Capture performance degrades rapidly with increasing cycle times

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  • Method of regenerating activity of calcium based absorbent and cyclically removing CO2

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Embodiment Construction

[0019] Such as figure 1 As shown, supplemented with fresh calcium-based absorbent15, carbon-based fuel14, O 2 13 into the calcining decomposition reactor 1, carbon-based fuel 14 and O 2 The combustion reaction of 13 provides heat for the decomposition of the absorbent, and by regulating the carbon-based fuel 14 and O 2 13 ratio and then control the temperature of calcining decomposition reactor 1 at 800-1000°C; fresh supplementary absorbent 15 is heated and decomposed into CaO and releases CO 2 , the produced CaO 6 is sent to the steam activation reactor, CO 2 After the enriched flue gas 16 is discharged from the top of the calcining decomposition reactor 1, it can be directly sealed or used for other purposes, so as to realize the reduction of CO in the flue gas. 2 removal and trapping; the temperature of steam activation reactor 2 is 300-400°C, and the reaction atmosphere is steam / N 2 Or steam / air mixed gas 9, wherein the steam concentration is 10-100%; CaO 6 from the c...

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Abstract

The invention discloses a method of regenerating the activity of a calcium based absorbent and cyclically removing CO2. The method comprises the following steps: introducing CO2 containing flue gas generated by fossil fuel into a carbonation reactor, carrying out carbonation reactions between the flue gas and a CaO absorbent to generate CaCO3, obtaining flue gas without CO2 from the outlet of thereactor, delivering CaCO3 into a burning decomposition reactor, decomposing CaCO3 into CaO and CO2 by the heat generated by burning a carbon based fuel in a pure oxygen atmosphere, storing or using flue gas with a high concentration of CO2 from the burning decomposition reactor, delivering obtained CaO into a steam activation reactor, carrying out hydration reactions between CaO and steam to generate solid Ca(OH)2; then delivering solid Ca(OH)2 to a dehydration reactor to convert Ca(OH)2 into CaO and H2O; and transferring obtained regenerated CaO to the carbonation reactor to capture CO2. Cyclic utilization is realized.

Description

technical field [0001] The present invention relates to CO 2 In the field of control and emission reduction, to be precise, it is a kind of calcium-based absorbent active regeneration and cyclic removal of CO 2 Methods. Background technique [0002] In order to cope with global warming and the intensification of the greenhouse effect, a large amount of CO released during the use of fossil energy needs to be 2 For abatement and control, a calcium-based absorbent-based cycle captures CO 2 The technology has attracted much attention because it can be coupled with the fossil energy utilization process. The technology is divided into two steps of carbonation and calcination: firstly, the calcium-based absorbent mainly composed of CaO is combined with the CO in the flue gas generated by the utilization of fossil fuels in the carbonation reactor. 2 Carry out carbonation reaction to form CaCO 3 , the carbonation reactor outlet can obtain low CO 2 concentration of flue gas; sub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/96B01D53/62B01D53/82
CPCB01D53/62B01D53/82B01D53/96B01D2251/404B01D2257/504B01D2258/0283Y02A50/20Y02C20/40
Inventor 荣鼐方廷勇朱曙光王晏平鲁祥友苏小明王庚马进伟田玺潘玮田杰李文祥
Owner ANHUI UNIVERSITY OF ARCHITECTURE
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