Kinetic analysis about the CO 2 capture capacity of lime mud from paper mill in calcium looping process

Lime mud, a kind of industrial waste that produced in paper mill, was proposed as CO 2 sorbent in calcium looping process. The carbonation performance of the lime mud was investigated in a dual‐fixed bed reactor (DFR) and a thermogravimetric analyzer (TGA). The carbonation kinetics of the lime mud i...

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Veröffentlicht in:Energy science & engineering 2020-11, Vol.8 (11), p.4014-4024
Hauptverfasser: Sun, Rongyue, Xiao, Rui, Ye, Jiangming
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Xiao, Rui
Ye, Jiangming
description Lime mud, a kind of industrial waste that produced in paper mill, was proposed as CO 2 sorbent in calcium looping process. The carbonation performance of the lime mud was investigated in a dual‐fixed bed reactor (DFR) and a thermogravimetric analyzer (TGA). The carbonation kinetics of the lime mud in the chemical reaction controlled stage was analyzed by a surface reaction‐controlled kinetic model. The results show that the lime mud presents much poorer carbonation performance during the chemical reaction controlled stage compared with the limestone, mainly due to the high content of chlorine in the lime mud. A prewash treatment process was used to decrease the chlorine content to mitigate the sintering of the lime mud when calcined at high temperature. After prewash treatment, the prewashed lime mud shows much higher CO 2 capture capacity during the chemical reaction controlled stage compared with the lime mud. A prolonged carbonation process successfully further enhances the microstructure and improves the carbonation performance of the prewashed lime mud in the chemical reaction controlled stage. The lime mud can be effectively used as CO 2 sorbent in calcium looping process after prewash treatment and the following prolonged carbonation treatment.
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The carbonation performance of the lime mud was investigated in a dual‐fixed bed reactor (DFR) and a thermogravimetric analyzer (TGA). The carbonation kinetics of the lime mud in the chemical reaction controlled stage was analyzed by a surface reaction‐controlled kinetic model. The results show that the lime mud presents much poorer carbonation performance during the chemical reaction controlled stage compared with the limestone, mainly due to the high content of chlorine in the lime mud. A prewash treatment process was used to decrease the chlorine content to mitigate the sintering of the lime mud when calcined at high temperature. After prewash treatment, the prewashed lime mud shows much higher CO 2 capture capacity during the chemical reaction controlled stage compared with the lime mud. A prolonged carbonation process successfully further enhances the microstructure and improves the carbonation performance of the prewashed lime mud in the chemical reaction controlled stage. 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subjects Calcium
Carbon dioxide
Carbon sequestration
Carbonation
Chemical reactions
Chlorine
Conversion
Fixed bed reactors
Fixed beds
Flue gas
Fossil fuels
Gases
High temperature
Industrial plant emissions
Industrial wastes
Kinetics
Lime
Limestone
Mud
Pulp & paper mills
Sorbents
Surface reactions
title Kinetic analysis about the CO 2 capture capacity of lime mud from paper mill in calcium looping process
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