Limestone dissolution in stack gas desulfurization. A mass‐transfer model is shown to predict the the measured dissolution rates with less than 30% error

Toprac, Anthony J.; Rochelle, Gary T.

doi:10.1002/ep.670010113

Cited by 39 publications

(6 citation statements)

References 3 publications

(1 reference statement)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on a shrinking core model, they proposed an empirical formulation that correlated limestone dissolution rates with its particle size. Toprac and Rochelle noted that initial particle size distribution had a significant effect, whereas the type of limestone had almost no effect. Gao et al measured the dissolution rate of limestone in the presence of sulfite.…”

Section: Introductionmentioning

confidence: 99%

Dissolution Reactivity and Kinetics of Low-Grade Limestone for Wet Flue Gas Desulfurization

Yang²,

Chen

et al. 2020

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Low-grade limestone with relatively low calcium (Ca) content is an alternative to high-grade limestone for wet flue gas desulfurization (WFGD). This paper presents an experimental study on the dissolution reactivity and kinetics of low-grade limestone under similar conditions which may be encountered in the WFGD process. Four limestone samples with calcium oxide (CaO) content ranging from 34.89 to 62.66 wt % are selected from different sources in China. The effects of experimental variables including the chemical compositions, slurry pH, initial particle size, and reaction temperature on various grades of limestone are investigated, respectively. Results show that dissolution rates of low-grade limestone are significantly inhibited in the presence of dolomite and diopside, which is the main form of Mg contained in low-grade limestone. The particle size has a smaller effect on dissolution reactivity for low-grade limestone compared with high-grade limestone, whereas reaction temperature and pH value have more significant effects. A kinetics analysis shows that lower grade limestone dissolution happens per the shrinking core model with an ash diffusion control and the apparent activation energy for the reaction increases as the limestone grade decreases.

show abstract

Section: Introductionmentioning

confidence: 99%

Dissolution Reactivity and Kinetics of Low-Grade Limestone for Wet Flue Gas Desulfurization

Yang²,

Chen

et al. 2020

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…In this case it is important to know the reactivity of produced calcium carbonate in the FGD process. Understanding of the limestone dissolution/reaction kinetics of the FGD processes has attracted quite serious attention (Siagi and Mbarawa, 2009;Toprac and Rochelle, 1982;De Blasio et al, 2012;Ye and Bjerle, 1994;Ahlbeck et al, 1993;Ahlbeck et al, 1995;Pepe, 2001;Ukawa et al, 1993;Chan and Rochelle, 1982;Shih et al, 2000). It is assumed that limestone dissolution is the rate controlling step of SO 2 absorption processes (Siagi and Mbarawa, 2009;Pepe, 2001).…”

Section: Introductionmentioning

confidence: 99%

Reactivity of calcium carbonate prepared from flue gas desulfurization gypsum

Jurišová

Danielik

Fellner

et al. 2019

Acta Chimica Slovaca

View full text Add to dashboard Cite

Reactivity of various calcium carbonate samples for flue gas desulfurization was tested. Two groups of CaCO3 samples were considered; natural limestone containing calcite phase dominantly and samples prepared by the conversion of gypsum with ammonium and carbon dioxide (precipitated CaCO3) containing different amounts of calcite, aragonite and vaterite. Reactivity of precipitated calcium carbonate depends primarily on the particle size, similarly as in case of industrial samples. The initial reaction rate was comparable with the industrial limestones for samples with the average particle size lower than 15 μm. However, the conversion of laboratory samples was significantly higher after 5 min of the reaction. Phase composition of the precipitated calcium carbonate has a minor but noticeable impact on the reactivity. The presence of vaterite slightly increased the reactivity, which is in accordance with its lower compact structure in comparison with calcite and aragonite. Unexpected effect of the increased content of aragonite, which is the most compact phase in comparison with calcite and vaterite, was observed. If calcium carbonate contains up to approximately 30 % of aragonite the reactivity increases, which can be explained by the SEM pictures showing agglomerate composition with relatively high specific surface. At higher contents of aragonite, the reactivity decreases. All the obtained results proved the suitability of precipitated CaCO3 prepared from flue gas desulfurization gypsum to be recycled in the flue gas desulfurization process.

show abstract

“…Several studies have been conducted in order to model the reactivity of limestone in these conditions. Often, the acidic conditions have been simulated by using HCl solutions [12][13][14][15][16][17]. Additionally, a common method is to carry out the experiments at conditions that simulate the steady state industrial process and, therefore, the pH is maintained approximately constant [9,18,19].…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Power to Enhance Limestone Dissolution in the Wet Flue Gas Desulfurization Process. Modeling and Results from Stepwise Titration Experiments

et al. 2018

View full text Add to dashboard Cite

The goal of this work is to assess the application of ultrasonic power to the reactive dissolution of limestone particles in an acidic environment; this would represent a novel method for improving wet Flue Gas Desulfurization industrial systems. In this study a stepwise titration method is utilized; experiments were done by using different particle size distributions with and without the application of ultrasound. The use of ultrasonic power sensibly affected the reaction rate of limestone and its dissolution; a major difference could be observed when samples from the Wolica region in Poland were studied. In this case, the overall dissolution rate was found to increase by more than 70%. The reactive dissolution of limestone does not follow the same mathematical model when sonication is in effect; in this case, an extra Ultrasonic Enhancement Constant was introduced. It was demonstrated that the dissolution is proportional to an Effective Reaction Surface and, therefore, surface interactions should also be taken into consideration. For this purpose, a study is presented here on the Z-potential and electrophoretic mobility of limestone samples measured in aqueous dispersions by means of Laser Doppler Micro-Electrophoresis.

show abstract

Limestone dissolution in stack gas desulfurization. A mass‐transfer model is shown to predict the the measured dissolution rates with less than 30% error

Cited by 39 publications

References 3 publications

Dissolution Reactivity and Kinetics of Low-Grade Limestone for Wet Flue Gas Desulfurization

Dissolution Reactivity and Kinetics of Low-Grade Limestone for Wet Flue Gas Desulfurization

Reactivity of calcium carbonate prepared from flue gas desulfurization gypsum

Ultrasonic Power to Enhance Limestone Dissolution in the Wet Flue Gas Desulfurization Process. Modeling and Results from Stepwise Titration Experiments

Contact Info

Product

Resources

About