Multiscale Coupling of Pore Structure Evolution with Decomposition Kinetics of Limestone

Li, Mingchun; Song, Lanting; Wu, Yusheng

doi:10.1002/ceat.201500023

Cited by 3 publications

(6 citation statements)

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“…The pore structure evolution and reaction characteristics of limestone with three particle sizes during calcination at 1073 K were reported in a previous work and the results demonstrated that the influences of particle size and pore structure on the reaction mechanisms cannot be ignored . An expression is also obtained for the conversion‐time curve which displays the effects of porous structure.…”

Section: Introductionmentioning

confidence: 66%

“…In order to verify the present theoretical model and demonstrate the dynamic reaction mechanisms, the numerical solutions of the present model for the thermal decomposition rates were compared with both the experimental data and the simulated results under different chemical reaction mechanisms performed in previous literature as shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

“…Based on the above experimental results of actual pore structure characteristics for calcined limestone, a probability density function with bimodal distribution was used to construct the pore volume percentage of the pore diameter interval i, φ ( d i ), as presented in previous work:

φ (d_{i}) = \frac{X}{d_{i} σ_{1} \sqrt{2 π}} \exp true[- \frac{{(\ln d_{i} - \ln μ_{1})}^{2}}{2 σ_{1}^{2}} true] + \frac{1 - X}{d_{i} σ_{2} \sqrt{2 π}} \exp true[- \frac{{false(normalln d_{i} - normalln μ_{2} false)}^{2}}{2 σ_{2}^{2}} true]

…”

Section: Resultsmentioning

confidence: 99%

“…The naturally occurring limestone of 98.1 % CaCO 3 purity obtained from a quarry in Liaoning Province, China was studied. The geological characteristics and the composition of this stone have been described in the literature . Pulverized stones were fractionated into samples of narrow particle size distribution.…”

Section: Methodsmentioning

confidence: 99%

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Dynamic simulation of coupled transmission processes and reaction mechanisms in porous calcined limestone

Yang

Song

et al. 2017

Can J Chem Eng

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The particle reaction model and dynamic reaction characteristics of limestone over a wide particle size range from 0.15 to 10 mm were studied by thermogravimetric analysis and nitrogen adsorption‐desorption techniques. A clear boundary between the sintered porous product layer and the undecomposed part was found by field emission scanning electron microscopy (FESEM) analysis. A dynamic coupling model considering the effects of varied pore structure and transport resistances was established based on the appropriate particle reaction model, which allowed us to predict the decomposition ratio and reaction regimes in a broad range of particle sizes. The dynamic characteristics of pore size distribution and reaction mechanisms were discussed. Over the defined particle size range and calcination temperature range, the diffusion of gaseous product through porous product layer will become the rate determining factor as the ratio of (r0‐rc)/r0 corresponding to 25 % Damköhler number above 0.35.

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Section: Introductionmentioning

confidence: 66%

Section: Resultsmentioning

confidence: 99%

φ (d_{i}) = \frac{X}{d_{i} σ_{1} \sqrt{2 π}} \exp true[- \frac{{(\ln d_{i} - \ln μ_{1})}^{2}}{2 σ_{1}^{2}} true] + \frac{1 - X}{d_{i} σ_{2} \sqrt{2 π}} \exp true[- \frac{{false(normalln d_{i} - normalln μ_{2} false)}^{2}}{2 σ_{2}^{2}} true]

…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Dynamic simulation of coupled transmission processes and reaction mechanisms in porous calcined limestone

Yang

Song

et al. 2017

Can J Chem Eng

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“…However, these models have two notable shortcomings: they consider neither the microstructure nonuniformity nor the sintering phenomenon. Regarding the first shortcoming, Li et al modeled the calcination of limestone under N 2 atmosphere and were able to describe the evolution of porous microstructure using a bimodal pore‐size distribution. However, they did not consider the CaO sintering phenomenon, which significantly affects the overall reaction rate and microstructure when calcination is performed under atmospheres containing CO 2 .…”

Section: Introductionmentioning

confidence: 99%

Effect of the CaO sintering on the calcination rate of CaCO₃ under atmospheres containing CO₂

et al. 2018

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For the calcination of CaCO3 under CO2‐containing atmospheres, a mathematical model taking into account the CO2‐catalyzed sintering of the CaO product layer is developed. In this model, a modified shrinking core model is coupled with a population balance‐based sintering model. By comparing model predictions with experimental data, it is found that CO2 strongly affects the overall calcination rate both at high temperature and CO2 partial pressure, since under these conditions CaO densification considerably reduces the effective diffusivity of CO2 within product layer. It is observed that for large particles, the CO2‐catalyzed sintering of CaO can produce the “die off” phenomenon, which takes place when the reaction stops due to the blockage of pores within product layer. Finally, it was determined that limestone impurities do not significantly affect the calcination reaction under atmospheres containing CO2, because CO2 causes a much greater increase of the CaO sintering rate than limestone impurities do. © 2018 American Institute of Chemical Engineers AIChE J, 64: 3638–3648, 2018

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Dynamic Coupling of Pore Structure Evolution with Carbonation Kinetics of CaO-Based Sorbents: Experiments and Modeling

Yang

Song

et al. 2017

Energy Fuels

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The microstructure and pore structure evolution of CaO-based sorbents in three particle size ranges of 0.075−0.1, 0.15−0.18, and 3 mm were investigated using field emission scanning electron microscopy with energy dispersive spectroscopy and nitrogen adsorption−desorption techniques. A clear heterogeneous distribution of elemental carbon across the sorbent particles was found. A particle carbonation reaction model considering the structural evolution effects and the heterogeneously distributed reaction profile were established and verified. It was found that the pore structure of different particle size sorbents all exhibited a transition from the bimodal distribution to the unimodal distribution, which has a great influence on the dynamic reactive characteristics during carbonation. Within the defined particle size range, the carbonation reaction regimes all transform from interface reaction control into mass-transfer control, and the obtained critical product layer thickness that marks the transformation of control regime are 22, 46, and 74 nm, respectively, at 923 K. The maximum relative errors between experimental data and the simulation results calculated separately under interface reaction control (X < 50%) and mass-transfer control (X > 55%) with the effect of pore structure evolution are 12.7% and 12.1% over the defined particle size range.

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Multiscale Coupling of Pore Structure Evolution with Decomposition Kinetics of Limestone

Cited by 3 publications

References 41 publications

Dynamic simulation of coupled transmission processes and reaction mechanisms in porous calcined limestone

Dynamic simulation of coupled transmission processes and reaction mechanisms in porous calcined limestone

Effect of the CaO sintering on the calcination rate of CaCO₃ under atmospheres containing CO₂

Dynamic Coupling of Pore Structure Evolution with Carbonation Kinetics of CaO-Based Sorbents: Experiments and Modeling

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Multiscale Coupling of Pore Structure Evolution with Decomposition Kinetics of Limestone

Cited by 3 publications

References 41 publications

Dynamic simulation of coupled transmission processes and reaction mechanisms in porous calcined limestone

Dynamic simulation of coupled transmission processes and reaction mechanisms in porous calcined limestone

Effect of the CaO sintering on the calcination rate of CaCO3 under atmospheres containing CO2

Dynamic Coupling of Pore Structure Evolution with Carbonation Kinetics of CaO-Based Sorbents: Experiments and Modeling

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Effect of the CaO sintering on the calcination rate of CaCO₃ under atmospheres containing CO₂